ALL OPTICAL FORWARD/INVERSE DISCRETE FOURIER TRANSFORM APPARATUS AND METHOD FOR OPTICAL OFDM TRANSMISSION AND TRANSCEIVER HAVING THE SAME
The present invention refers to optical orthogonal frequency division multiple (Orthogonal Frequency Division Multiplexing, constitution: a method is hereinafter "OFDM") for communication an inverse discrete Fourier transform/discrete control device and method and device relates to transceiver including the same, optical than OFDM communication system at a sending end of the non optical OFDM symbols (Symbol) for optically (Optically) generating and, at the receiving end the microcomputer controls operations of respective demultiplexing an optical OFDM for communication an inverse discrete Fourier transform/discrete control device and method and transceiver including the same relates to device. Generally, fast Fourier transform (Fast Fourier Transform, "FFT" constitution: a method hereinafter) the N of the two time region of sample points, comprising a corresponding N two converted into of sample points the frequency domain of a digital signal was used to treat the is an algorithm. OFDM scheme is divided into several data to be transmitted modulates the, modulated data in parallel are defined. a multicarrier transmission. The discrete Fourier transform device (Subcarrier) subcarrier (Discrete Fourier Transform, "DFT" constitution: a method hereinafter) obtained using the free surfaces. Figure 1 shows a OFDM symbols existing optical communication system in a block system is configured of the existing method. With a 1 also, OFDM symbols are is generated by the electronic inverse (Electronic Inverse) FFT. Inverse (Inverse) FFT has a low frequency data from the orthogonal speed low multiple elements are for multiplexing onto a carrier wave is used by. I.e., receiver (Receiver) (Photodetector) photo detector in OFDM symbols received optical is electronic (Electronic) FFT for corresponding to the. desired position by utilizing a electric wave foam (Electrical waveform). FFT should be noted that the results of each carrier exhibits and data transmitted in a. However, a legacy system and resulting processing OFDM symbols in the case of piston using the electromagnetic signal to an optical signal and converts an, through electrical coupling, the electric signal light having a selected the d/a converter generates and. required. The optical communication systems, is formed into the identified shape limit performance. The present invention refers to the aforementioned one of the upper and lower surfaces so as, the present purpose of the invention an optical OFDM of symbols generation and processing of the signal at optical, electrical transducer electronic is desired (Electronic) fast Fourier transform (FFT) without the use of, at a sending end of the non optical OFDM communication system optical OFDM symbols optically (Optically) generating and, at the receiving end the microcomputer controls operations of respective demultiplexing an optical OFDM for communication an inverse discrete Fourier transform/discrete control method and device, and transceiver including the same is provided to device. It is another object the present invention refers to existing optical communication system a higher frequency (spectral efficiency) constitution: an optically boosted electro-OFDM efficiency for communication an inverse discrete Fourier transform/discrete control device and device transceiver including the same and method is provided to. 800 to achieve aspect of the present invention number 1, that in number correspond to the number of sub-carriers light frequency N the respective sub-carrier transmitted from input for resolving the time interval 1 of N:N dispenser; each 1:N is divided from the dispenser for performing phase shift of signals phase-shifting delay array module; outputted from said phase shift delay array module for resolving inverse signals of N N:1 power coupler; each N: light division back from coupler power 1 OFDM of symbols for carrying out time delay time delay array module; and said time delay array module outputted from N for resolving inverse signals: 1 for communication including optical OFDM power to the weighty member and an inverse discrete Fourier transform control electrode 104 is provided under the device. Aspect of the present invention number 2, optical signal from the co OFDM symbols for on N 1:N dispenser; said 1:N of signals is divided each from the dispenser for carrying out time delay time delay array module; each outputted from said time delay array module for resolving signals N of 1:N dispenser; each 1:N is divided from the dispenser for performing phase shift of signals phase-shifting delay array module; and outputted from said phase shift delay array module for resolving inverse signals N N of: for communication to the weighty member and power 1 including optical OFDM discrete Fourier transform device control electrode 104 is provided under the. Aspect of the present invention number 3, optical orthogonal frequency division multiple (OFDM) access system in optical data transmission in a transmission device, specific optical spectrum and PWM light having a pulse generator for outputting data; said pulse generator of manufacture 1 a on N data: N dispenser; said 1:N from the dispenser parts are N modulating the loads sub-carrier in the optical data of modulator; and each modulator for optical data modulated sub-carriers from optically inverse discrete Fourier transform to the signal OFDM symbols an inverse discrete Fourier transform electric generating device including a OFDM optical characterized by a transmission communication to electrode 104 is provided under the device. Wherein, optical data inputted in Serial OFDM modulation receive a signal, converts it into a parallel signal, which outputs to the each modulator desirably further included in deserializer. Preferably, said 1:N distributor is connected between each modulator, capable of smoothing a performance of each subcarrier of sub-carriers to a phase and amplitude (pre-emphasis) a pre-emphasis for differently controlling a can be further includes a control module is. Preferably, pulse outputted from pulse generator said shape of spectrum can be in the form of Gaussian. Preferably, an inverse discrete Fourier transform electric said a device, that in number correspond to the number of sub-carriers light frequency N the respective sub-carrier transmitted from input for resolving the time interval 1 of N:N dispenser; each 1:N is divided from the dispenser for performing phase shift of signals phase-shifting delay array module; outputted from said phase shift delay array module for resolving inverse signals of N N:1 power coupler; each N: light division back from coupler power 1 OFDM of symbols for carrying out time delay time delay array module; and said time delay array module outputted from N for resolving inverse signals: may include to the weighty member and power 1. Aspect of the present invention number 4, optical orthogonal frequency division multiple (OFDM) access system receiving optical data transfer in in device, optical signal from the co OFDM symbols optically discrete Fourier transform to the reverse multiplexing processing electric discrete Fourier transform device; said electric discrete Fourier transform device the optical back from a particular optical spectrum OFDM symbols light having a and PWM N a parallel output data pulse generator of two; an optical data parallel output generator receives each pulse electrically in N single photo diode; and each photodiode of the photodiode converted from the electrical data in parallel receives one into Serial data to a serializer optical characterized by including receiving communication OFDM electrode 104 is provided under the device. Wherein, said electric discrete Fourier transform device a, optical signal from the co OFDM symbols for on N 1:N dispenser; said 1:N of signals is divided each from the dispenser for carrying out time delay time delay array module; each outputted from said time delay array module for resolving signals N of 1:N dispenser; each 1:N is divided from the dispenser for performing phase shift of signals phase-shifting delay array module; and outputted from said phase shift delay array module for resolving inverse signals N N of: power to the weighty member and preferably comprises an 1. Preferably, each pulse generator pulse outputted from Gaussian shape of spectrum can be in the form of. Aspect of the present invention number 5, optical orthogonal frequency division multiple (OFDM) access system optical data transmission device for the prevention of in in, specific optical spectrum and PWM for outputting data light having a number 1 pulse generator; said number 1 pulse generator of manufacture 1 a on N data: N dispenser; said 1:N from the dispenser parts are N modulating the loads sub-carrier in the optical data of modulator; each modulator for optical data modulated sub-carriers from optically inverse discrete Fourier transform to the signal OFDM symbols an inverse discrete Fourier transform electric generating device; said device an inverse discrete Fourier transform electric light generated from OFDM symbols optically discrete Fourier transform to the reverse multiplexing processing electric discrete Fourier transform device; said electric discrete Fourier transform device the optical back from a particular optical spectrum OFDM symbols light having a and PWM N a parallel output data of number 2 pulse generator; each number 2 pulse generator parallel from [...] scale data before data of manufacture in N single photo diode; and said electrical data converted from the photodiode receives in parallel one into Serial data to a serializer characterized by optical OFDM communication including for the prevention of electrode 104 is provided under the device. Wherein, optical data inputted in Serial OFDM modulation receive a signal, converts it into a parallel signal, which outputs to the each modulator desirably further included in deserializer. Preferably, said 1:N distributor is connected between each modulator, capable of smoothing a performance of each subcarrier of sub-carriers to a phase and amplitude (pre-emphasis) a pre-emphasis for differently controlling a can be further includes a control module is. Preferably, an inverse discrete Fourier transform electric said discrete Fourier transform device of said electric device and is connected between, an inverse discrete Fourier transform device said electric light generated from OFDM symbols for removing unnecessary spectrum wide band filter can be is further included in. Preferably, said number 1 and number 2 pulse outputted from pulse generator Gaussian shape of spectrum can be in the form of. Preferably, an inverse discrete Fourier transform electric said a device, that in number correspond to the number of sub-carriers light frequency N the respective sub-carrier transmitted from input for resolving the time interval 1 of N:N dispenser; each 1:N is divided from the dispenser for performing phase shift of signals phase-shifting delay array module; outputted from said phase shift delay array module for resolving inverse signals of N N:1 power coupler; each N: light division back from coupler power 1 OFDM of symbols for carrying out time delay time delay array module; and said time delay array module outputted from N for resolving inverse signals: may include to the weighty member and power 1. Preferably, said electric discrete Fourier transform device a, optical signal from the co OFDM symbols for on N 1:N dispenser; said 1:N of signals is divided each from the dispenser for carrying out time delay time delay array module; each outputted from said time delay array module for resolving signals N of 1:N dispenser; each 1:N is divided from the dispenser for performing phase shift of signals phase-shifting delay array module; and outputted from said phase shift delay array module for resolving inverse signals of N N: may include to the weighty member and power 1. Aspect of the present invention number 6, (a) that in number correspond to the number of sub-carriers light frequency N the respective sub-carrier transmitted from input 1 the time interval: N partitioning the video stream into a main step ; (b) said each 1:N is divided into for performing phase shift of signals by extending a control signal of a step ; (c) said N signals each in the output from the (b) step: 1 mounting substrate, and dividing the reverse; N in (d) said step (c): 1 OFDM light division reverse time delay of symbols the outputs; and (e) said N signals in the output from the (d) step: mounting substrate, and dividing the reverse 1 OFDM optical including an inverse discrete Fourier transform control for communication by a rope. provides method. Aspect of the present invention number 7, optical signal from the co (a ') N on the OFDM symbols ; (b') time delay of signals is said N the outputs; said step (c ') (b') in the output from the each signals 1:N partitioning the video stream into a main step ; (d ') in said step 1 (c'): N is divided into for performing phase shift of signals by extending a control signal of a step; and said step (e ') (d') N signals in the output from the: mounting substrate, and dividing the reverse 1 including optical OFDM control discrete Fourier transform method for communication by a rope. provides. Such as taught or more OFDM optical of the present invention for communication an inverse discrete Fourier transform/discrete control method and device, and transceiver including the same according to device, (FFT) for high speed Fourier transform of existing optical wavelengths required for the electrical wavelength conversion, electrical wavelength light wavelength of which crystal display unit capable of omitting a converting step, optical OFDM therefore electronic device, optical transmission more fast limit speed of optoelectronic devices.. In one example 4x25 Gbps optical data transfer transmitter and receiver when it is applied to electronic devices required 100 Gbps OFDM, 25 Gbps to about bandwidth needs of optoelectronic device capable of reducing the contact point is turned off. Furthermore, according to the present invention, optical OFDM 4x25 Gbps transmission and extended (amplified) transmission 100 Gbps RZ (return to zero) if viewed compared to transmission capacity, optical OFDM transmission system (spectral efficiency) high spectral efficiency while having contact point is turned off. Hereinafter, reference to accompanying drawing of the present invention embodiment. rapidly and to reduce a memory thereby, the cold air flows. However, then various relate a illustrated of the present invention embodiment may be deformed of means and in different phases, the next range of the present invention a described embodiment aspect limited not. Person with skill in the art of the present invention embodiment relate to an entire surface in the art for the present invention is provided to illustrate the. emits the light from a light source. Figure 2 shows a control according to one embodiment of the present invention also an inverse discrete Fourier transform device is general outline account for. Also refers to surface 2, one embodiment of the present invention according to an inverse discrete Fourier transform control device a, greatly N of 1 : (Splitter) dispenser N (100n to 100a), phase shift delay array module (200), N of N:1 power coupler (Power Coupler) (300n to 300a), time delay array module (400) and N:1 power coupler (500) includes to 6:4.. Wherein, 1 of N:N dispenser (100n to 100a) the of sub-carriers (Optical Frequency) light frequency that in number correspond to the number transmitted from input N the respective sub-carrier signal performs a function on. Phase shift delay array module (Phase Shift Delay Array Module) (200) each 1:N dispenser (100n to 100a) divided from serves for performing phase shift of signals make. N of N:1 power coupler (300n to 300a) has phase-shifting delay array module (200) partitioning the inverse signals outputted from performs function. Time delay array module (Delay Array Module) (400) each N:1 power coupler (300n to 300a) light division back from OFDM of symbols make serves for performing time delay. N:1 power coupler (500) generates a time delay array module (400) partitioning the inverse signals outputted from performs function. While, one embodiment of the present invention from power coupler or dispenser (Power Coupler or Splitter) .can in parallel each other. And, an inverse discrete Fourier transform-point N (Inverse DFT) enabled to operate close to the loop of equations is defined by 1. Wherein, εm time domain m exhibits second samples. N-point discrete Fourier transform (DFT) to operate close to the loop frequency is defined by 2 equations. Wherein, Ek the frequency domain in the second k exhibits samples. Integer value N total the number of samples exhibiting, the 0 m and a k N is less rather than greater than or the same as the (0≤k, m N an interlayer). Corresponding each time and frequency location (position) of the following expressions is defined by 4 expressions and 3. tm =mτ ωk =kδ Wherein, τ Δτ=2π / N And, optical circuit i.e., an inverse discrete Fourier transform electric device input signal ωk the of sub-carriers is light frequency, also the implementation of a optical circuit such as shown in 2, power coupler or dispenser (Power Coupler or Splitter) through power admixtures with light due a combination of phase delay (Optical Path Length Adjustments) adjusting path length through. delivery is to be made over. Each passage (Path) overall based on the relative and time delays suitable each phase adjustment (Phase Tuning) conventional except for a separation restricting and a wavelength division multiplexing system (Wavelength Division Multiplexer).. Therefore, OFDM each carrier of a high (Wavelength Components) elements all wavelengths corresponding to one at the output port of a multiplexing (orthogonally) orthogonal arrangement such that the (multiplexed) an input port is (Matched) corresponding in keeping with the frequency of only one optical subcarrier counter counts port on at interference (constructive interference).. While, all other carriers are destructive interference output port. (destructive interference). The 3b and 3a also according to one embodiment of the present invention control examples of discrete Fourier transform device is concept account for. I.e., also said device (Forward DFT) Fourier transform discrete electric sign of the present invention in such a way can be constructed. Said electric discrete Fourier transform device (Forward DFT) comprises a phase-semi sum (phase conjugation) (negative) Mltiplication except for direction of phase shift of approximate, an inverse discrete Fourier transform electric device (Inverse DFT) opposite delay of invariability reversal requiring is connected to the semiconductor layer. (retro-propagation invariant). Also refers to surface 3a, the device (Forward DFT) Fourier transform discrete electric sign of the present invention, optical signal from the co OFDM symbols for on N 1:N dispenser (Splitter) (500 ') and a, said 1:N dispenser (500') respectively from division of signals time delay for carrying out time delay array module (Delay Array Module) (400 ') and, said time delay array module (400') each outputted from N for resolving signals of 1:N dispenser (Splitter) ('-300n' 300a) and a, each 1:N dispenser ('-300n' 300a) divided from for performing phase shift of signals phase-shifting delay array module (Phase Shift Delay Array Module) (200 ') and, said phase shift delay array module (200') inverse signals outputted from two N for resolving N:1 power coupler (power coupler) ('-100n' 100a) can be constructed including. Signal detection method for fabricating (SWa-SWn) said N:1 power coupler ('-100n' 100a) and the output upon detection is each connected to a between the (on) which short, these a porous discrete Fourier transform may be included in device (Forward DFT). Also refers to surface 3b, device (Forward DFT) Fourier transform discrete electric sign in addition of the present invention an optical which has been inputted OFDM symbols for on N 1:N dispenser (Splitter) (500 ') and a, said 1:N dispenser (500') respectively from division of signals time delay for carrying out time delay array module (Delay Array Module) (400 ') and, said time delay array [...] (400') to an output stage of the upon detection is each connected to a shorted signal detection method for fabricating (SWa-SWn) and, said switch being output across the to travel on the travelling track by (SWa-SWn) for resolving signals N of 1:N dispenser (Power Splitter) ('-300n' 300a) and a, said 1:N dispenser ('-300n' 300a) is divided each from for performing phase shift of signals phase-shifting delay array module (200 ') and, said phase shift delay array module (200') inverse signals outputted from two N for resolving N:1 power coupler (power coupler) ('-100n' 100a) can be constructed including. A detection signal (detection pulse) said switch (SWa-SWn) used in the length of the input time domain sampling space τ similar to that a pulse width of a preferably is to produce. On the other hand, electric system entity, and the input of an inverse discrete Fourier transform device (Inverse DFT) space domain sampling time τ similar to that means of laser pulses having a pulse width of a generated through. The other optical carrier frequency input d the stick which it pushes between (deterministic) relative phase relationship to obtain the equalize (phase relationship). Therefore, a pre-emphasis (Pre-emphasis), power smoothing (Power Equalization) known to existing such as OFDM or by a sand blast, an optimized signal the shape of enveloping surface by the crosstalk correction, nonlinear crosstalk correction can be using. Figure 4 shows a one embodiment of the present invention also the optical device for the prevention of OFDM communication concept as account for, the aforementioned of the present invention an inverse discrete Fourier transform/discrete electric using device 100 Gbps transmission applications is to explain the general outline (Application). Also refers to surface 4, one embodiment of the present invention for the prevention of the optical OFDM communication device i.e., a transmitter for transmission 4x25 Gbps transmission system 100 Gbps (Transmitter) (600) and a receiver (Receiver) (700) 17 forms. Wherein, transmitter (600) the greatly, pulse generator (pulse carver) (610), 1:N dispenser (Splitter) (620), two N (N=4) modulator (Modulator, MOD) (630d to 630a) and an electric an inverse discrete Fourier transform device (640) includes to 6:4.. Pulse generator (610) detects the special optical spectrum of light having a and PWM apparatus and method for controlling perform, e.g., cw (continuos-wave) laser diode (Laser Diode, LD) is operating is injected from the injection-absorbing (electro-absorption) 160 GHz include (pulse carver) pulse generator using an SLM (full width) has optical spectrum of a Fe 3-dB in, having a short width 2.8 ps 3-dB generates pulse. The, pulse spectrum shape has practical application the bandwidth model in the form of Gaussian sufficiently large width is desirably. 1:N dispenser (620) or power coupler (power coupler) has pulse generator (610) of manufacture (N=4) dividing the yoke layer into two N data performs function. N (N=4) two modulator (630d to 630a) the 1:N dispenser (620) divided from each optical data sub-carrier in the performs function modulating the loads. An inverse discrete Fourier transform electric device (640) each modulator (630d to 630a) for optical data modulated sub-carriers from optically inverse discrete Fourier transform to the signal functions to generate a OFDM symbols perform, is also as detailed reference to a 2. A transmitter configured and (600) in the output from the pulses 1:N dispenser (620) or power coupler (power coupler) of 4 through 25 Gbps modulator (630d to 630a) inputted to, current position and size in the electric sign data an inverse discrete Fourier transform device (640) is input to an input port of carriers. On the other hand, optical DFT phase-shifting in the (phase shift) the lowest optical subcarrier non-optical carrier midamble of is based by (midpoint frequency) frequency point (referenced) copyright 2000. I.e., optical carrier midamble of the (midpoint frequency) point fc defined by, fc the cw. corresponding to wavelength of (LD) laser diode (wavelength). Additionally, optical data inputted in Serial OFDM modulated signal (100 Gbps) receive a converts it into a parallel signal, each modulator (630d to 630a) deserializer (De-serializer) (650), which outputs to the can be is further included in. Furthermore, 1:N dispenser (629) and a each modulator (630d to 630a) is connected with the between, capable of smoothing a performance of each subcarrier of sub-carriers to (equalize) and the amplitude and (amplitude) differently controlling a phase (phase) for a pre-emphasis control module (pre-emphasis control module) (660) can be is more saturated. And, receiver (700) an optical which has been inputted OFDM symbols optically discrete Fourier transform to the reverse multiplexing processing electric discrete Fourier transform device (710) and a, electric discrete Fourier transform device (710) the optical back from a particular optical spectrum OFDM symbols light having a and PWM N (N=4) a parallel output data pulse generator of two (720d to 720a) and a, each pulse generator (720d to 720a) parallel output from an optical data electrically in the insulating layer of the photodiode region (N=4) two N (Photodiode, PD) (730a to 730d) and a, each photodiode of the photodiode (730a to 730d) converted from the electrical data in parallel receives one into Serial data (Serializer) (740) a series converter 17 forms. Furthermore, an inverse discrete Fourier transform electric device (640) and an electric discrete Fourier transform device (710) is connected between of, an inverse discrete Fourier transform electric device (640) light generated from OFDM symbols for removing unnecessary spectrum wide band filter (Optical bandpass filter) (800) can be is further included in. The 5a also one embodiment of the present invention the optical OFDM power spectral density of transmission system (power spectral density) as indicative of the graph, a transmitter for communication OFDM optical of Figure 4 (600) in a composite structure is optical carrier frequency of power spectral density is graph indicative of the (power spectral density). Also refers to surface 4 and 5a, OFDM transmitter (600) power spectral density structure, in a each optical carrier frequency which representative of the feature (impulse) impulse at an intermediate portion 25 GHz, that of traditional components formed out of curve filars in the upper part of the output of OFDM transmitter (Transmitter) exhibits and power spectral density. (Tone position) tone position in one example is the of subcarriers position and orientation coordinates and information received not, data information, a lower portion of a tone indicating data is power spectral density (tone) is (modulated) modulation among. I.e., , a lower portion of the dotted lines and a thin dashed lines curve each odd channel frequency f1, f3 or even channel frequency f2, f4 are arranged when the multiplexed into power spectral density exhibiting, f1, f2, f3, f4 referred to as a which the subcarrier de-tuning frequency (subcarrier detuning frequency), -37.5, -12.5, +12.5, 37.5 GHz. respectively. All subcarriers are used in one example is when an inverse discrete Fourier transform electric device (Inverse DFT) (640) is (suppressed) suppressing of the light, an inverse discrete Fourier transform electric device (Inverse DFT) (640) the output of the to remove unnecessary spectrum wide band filter (Optical bandpass filter) (800) is input to. Example function of the filter 4 is a Fe 160 GHz 3-dB Gaussian super difference (forth-order super gaussian with 3-dB full width of 160 GHz). The 5b also one embodiment of the present invention the optical OFDM transmission system (optical waveform) is graph indicative of the of light. Also refers to surface 4 and 5b, an inverse discrete Fourier transform electric waveform in the upper part of the device (Inverse DFT) (640) of manufacture chemical formula 6, m is an OFDM symbols, (diagram) are a variety of data modulation (modulation) types are stacked up a catalyst system comprising at least one choice, optical OFDM symbols to the typical half-period symbol (symbol period) is 40 ps consisting 10-ps characteristics (feature). Pulse dispenser (splitter) i.e., 1:N dispenser (620) and a electric sign an inverse discrete Fourier transform device (Inverse DFT) (640) between a pre-emphasis control module (pre-emphasis control module) (660) a receiver (700) capable of smoothing a performance of each sub-carrier in to (equalize) and the amplitude and (phase) phase of sub-carriers can be differently controlling a (amplitude). Said transmitter (600), for example, in model m lung cis subcarrier de-tuning frequency (subcarrier detuning frequency) f1, f2, f3, f4 for {-1.3, -1, +1, +1.3} of a pre-emphasis (pre-emphasis) were selected value. These values are optical amplifier noise (optical amplifier noise) and of subcarriers crosstalk penalty (crosstalk penalty) to a receiver (700) (equalize) to capable of smoothing a performance of. Codes of values (pre-emphasis) a pre-emphasis said beginning, middle, and end, storing the changed OFDM symbols waveform (waveform) which predominantly the same sign of a pre-emphasis (pre-pmphasis) values are peak safety belt, a single intermediate waveform OFDM symbols generates a (single strong peak). OFDM symbols 60 ps and 20 also 5b of gram diaryl null (null) value in a position located adjacent 10 ps portion (spreading) the extension of the peak power (peak power). it is shown. Optimized [...] (pre-emphasis) a pre-emphasis (optimized) a nonlinear value. to reduce (nonlinearity impairment). Also, a lower portion of the a receiver 5b (700) electric sign in discrete Fourier transform device (Forward DFT) (710) light (demultiplexed) reverse multiplexing by OFDM symbols is represents a degree. Also, a lower portion of the with a 5b, clear eye opening (eye-opening) are symbols period (period) in the middle of the revealed which has, data is received at the (narrow time window) 10 ps time, a small window, resulting in. In addition receiver (700) electric sign in discrete Fourier transform device (Forward DFT) has door 3b can be constructed such as a. The 5c also according to one embodiment of the present invention door 3b control consisting of discrete Fourier transform device (Forward DFT) light (demultiplexed) reverse multiplexing by OFDM symbols is represents a degree. Also refers to surface 5c, an inverse discrete Fourier transform electric waveform in the upper part of the device (Inverse DFT) (640) of manufacture chemical formula 6, m is an OFDM symbols, also exhibits properties such as and a 5a.. Also, a lower portion of the with a 5c, 20 and 60 ps light (detection) detected in a position located OFDM symbols are of hope appeared.. Also 3b provided to offer an all-optical discrete Fourier transform device (Forward FDT) in detector modulating light has a light (detector). to perform detection of OFDM symbols. Discrete Fourier transform device (Forward DFT) (710) the sampling point (sampling points) both time domain waveform (time domain waveform) have values which meaningful only. A machine for using it (repeating) the 25 GHz repeated in an electronic-absorbing (electro-absorption) modulator pulse generator (electro-absorption modulator pulse carver) i.e., pulse generator (pulse carver) (720d to 720a) is waveform (waveform) for the for changing the RZ (Return to Zero) are used in output all subcarriers. Pulse generator (720d to 720a) is 8.8ps width of the (width). The 18 GHz 3-dB RZ optical data (data) bandwidth (bandwidth) photodiodes with (Photodiode) (730a to 730d) (electrical) electrically by is converted data. Electronic elements are used in this application the (electronic components) has a bandwidth of at less than 25 GHz. The 6a also one embodiment of the present invention: an 4x25 Gbps optical OFDM transmission system and single channel (single-channel) 100 Gbps RZ system of power spectral density graph for comparison of as (power spectral density), a pre-emphasis (pre-emphasis) of OFDM using PSD spectrum slope (slope) the (flat) a relatively flat, a a sharp reduction in and out about 50 GHz. RZ having about 30% duty ratio (duty ratio) with a smooth-spectrum data of 50 GHz by the power supply extends more remotely. Also refers to surface 6a, optical OFDM transmission higher or twice (spectral efficiency) having spectral efficiency. Spectrum data (resolution) compass assembly 0.1 nanometer, 20dB optical noise ratio (Optical Signal To Noise Ratio) corresponding to a native amplification emission (mplified spontaneous emission, ASE) value are used. The 6b also one embodiment of the present invention: an 4x25 Gbps optical OFDM transmission system and single channel Q factor of 100 Gbps RZ system is for comparison of graph OSNR contrast performance. 6b also refers to surface, called "OSNR-limited performace regime" low OSNR limit (lower OSNR limit) in both transmission RZ and OFDM performance similar to 100,000.. Resulted in smaller dimensions and that produces less (impact) impact from emission amplification natural, (crosstalk penalty) penalty leakage between subcarrier OFDM similar single channel transmission RZ. made apparent than in Q factor of. 8.5dB, optical OFDM the 1.4dB OSNR penalty.. Subcarrier, there are no are perpendicular to the adjacent reduces the penalty is incurred. Optical OFDM for communication the aforementioned the present invention according to an inverse discrete Fourier transform/discrete control device and method, and device transceiver including the same to preferred embodiment described but focuses, at limited to the present invention refers to claim a and appends detailed description of the invention and within range of the drawings embodiment the hole to which the variously it is possible the. belonging to in addition the present invention. Figure 1 shows a OFDM symbols existing optical communication system in a block system is configured of the existing method. Figure 2 shows a control according to one embodiment of the present invention also an inverse discrete Fourier transform device is general outline for account According to one embodiment of the present invention the 3a also control examples of discrete Fourier transform device is concept account for. According to one embodiment of the present invention the 3b also control examples of discrete Fourier transform device is concept account for. Figure 4 shows a one embodiment of the present invention also the optical device for the prevention of OFDM communication account for is general outline. The 5a also one embodiment of the present invention the optical OFDM of transmission system (power spectral density) is graph indicative of the power spectral density. The 5b also one embodiment of the present invention the optical OFDM transmission system (optical waveform) is graph indicating a of light. The 5c also one embodiment of the present invention the optical OFDM really the hand system of light is graph indicating a (optical waveform). The 6a also one embodiment of the present invention: an 4x25 Gbps optical OFDM transmission system and single channel 100 Gbps RZ system of power spectral density is of graph for comparison of (power spectral density). The 6b also one embodiment of the present invention: an 4x25 Gbps optical OFDM transmission system and single channel Q factor of 100 Gbps RZ system is for comparison of graph OSNR contrast performance. Disclosed are a forward discrete/inverse-discrete Fourier transform device and method for optical orthogonal frequency division multiplexing (OFDM) communication and a transmitting and receiving apparatus. The forward inverse-discrete Fourier transform device includes N 1:N splitters for splitting subcarrier signals received from N inputs corresponding to the number of optical frequencies of subcarriers, a phase shift delay array module for shifting phases of the split signals from the 1:N splitters, N N:1 power couplers for coupling signals output from the phase shift delay array module, a time delay array module for performing time delay on optical OFDM symbols from the N:1 power couplers, and an N:1 power coupler for coupling signals output from the time delay array module. N that in number correspond to the number of sub-carriers light frequency input from the respective sub-carrier transmitted for resolving the time interval 1 of N:N dispenser; Each 1:N is divided from the dispenser for performing phase shift of signals phase-shifting delay array module; Outputted from said phase shift delay array module for resolving inverse signals of N N:1 power coupler; Each N: light division back from coupler power 1 OFDM of symbols for carrying out time delay time delay array module; and Outputted from said time delay array module for resolving inverse signals N:1 power to the weighty member and include the function a control for communication OFDM optical characterized by an inverse discrete Fourier transform device. N optical signal from the co on OFDM symbols 1 for: N dispenser; Said 1:N of signals is divided each from the dispenser for carrying out time delay time delay array module; Each outputted from said time delay array module for resolving signals N of 1:N dispenser; Each 1:N is divided from the dispenser for performing phase shift of signals phase-shifting delay array module; and Outputted from said phase shift delay array module for resolving inverse signals of N N:1 power to the weighty member and include the function for communication OFDM optical characterized by a discrete Fourier transform device control. According to Claim 2, time delay array module output stage and 1:N N or between of the dispenser: 1 power coupler between output stage and the last output stage a plurality of switches which is similar to the is included each OFDM optical characterized by discrete Fourier transform device for communication control. According to Claim 3, N:1 power coupler output stage and the last output stage provided between upon detection the signal switch input time domain sampling space (τ) to configured for enablement short during OFDM optical characterized by discrete Fourier transform device for communication control. Optical orthogonal frequency division multiple (OFDM) access system in optical data transmission in a transmission device, Specific optical spectrum and PWM light having a pulse generator for outputting data; Said pulse generator of manufacture 1 a on N data: N dispenser; Said 1:N from the dispenser parts are N modulating the loads sub-carrier in the optical data of modulator; and Each modulator for optical data modulated sub-carriers from optically inverse discrete Fourier transform to the signal OFDM symbols an inverse discrete Fourier transform electric generating device to the offset of a OFDM communication optical characterized by a transmission device. According to Claim 5, Optical data inputted in Serial OFDM modulation receive a signal, converts it into a parallel signal, which outputs to the each modulator deserializer further included in optical OFDM communication which is similar to the characterized by a transmission device. According to Claim 5, Said 1:N distributor is connected between each modulator, capable of smoothing a performance of each subcarrier of sub-carriers to a phase and amplitude differently controlling a (pre-emphasis) a pre-emphasis for further included in a control module is characterized by optical OFDM communication is composed of a transmission device. According to Claim 5, Outputted from pulse generator said pulse spectrum shape of Gaussian in the form to a transmission device characterized by optical OFDM communication. According to Claim 5, An inverse discrete Fourier transform electric said device a, N that in number correspond to the number of sub-carriers light frequency input from the respective sub-carrier transmitted for resolving the time interval 1 of N:N dispenser; Each 1:N is divided from the dispenser for performing phase shift of signals phase-shifting delay array module; Outputted from said phase shift delay array module for resolving inverse signals of N N:1 power coupler; Each N: light division back from coupler power 1 OFDM of symbols for carrying out time delay time delay array module; and Outputted from said time delay array module for resolving inverse signals N:1 includes power to the weighty member and is composed of a transmission device characterized by optical OFDM communication. Optical orthogonal frequency division multiple (OFDM) access system receiving optical data transfer in in device, Optical signal from the co OFDM symbols optically discrete Fourier transform to the reverse multiplexing processing electric discrete Fourier transform device; Said electric discrete Fourier transform device the optical back from a particular optical spectrum OFDM symbols light having a and PWM N a parallel output data pulse generator of two; An optical data parallel output generator receives each pulse electrically in N single photo diode; and Each photodiode of the photodiode converted from the electrical data in parallel receives one into Serial data comprises a serializer OFDM optical characterized by a receiving communication device. According to Claim 10, Said electric discrete Fourier transform device a, N optical signal from the co on OFDM symbols 1 for: N dispenser; Said 1:N of signals is divided each from the dispenser for carrying out time delay time delay array module; Each outputted from said time delay array module for resolving signals N of 1:N dispenser; Each 1:N is divided from the dispenser for performing phase shift of signals phase-shifting delay array module; and Outputted from said phase shift delay array module for resolving inverse signals of N N:1 includes power to the weighty member and is composed of optical characterized by OFDM communication receiving device. According to Claim 11, Each pulse generator pulse outputted from Gaussian shape of spectrum in the form to characterized by optical OFDM communication receiving device. Optical orthogonal frequency division multiple (OFDM) access system optical data transmission device for the prevention of in in, Specific optical spectrum light having a and PWM pulse generator number 1 for outputting data; Said number 1 pulse generator of manufacture 1 a on N data: N dispenser; Said 1:N from the dispenser parts are N modulating the loads sub-carrier in the optical data of modulator; Each modulator for optical data modulated sub-carriers from optically inverse discrete Fourier transform to the signal electric generating OFDM symbols an inverse discrete Fourier transform device; An inverse discrete Fourier transform device said electric light generated from OFDM symbols optically discrete Fourier transform to the reverse multiplexing processing electric discrete Fourier transform device; Said electric discrete Fourier transform device the optical back from a particular optical spectrum OFDM symbols light having a and PWM N a parallel output data of number 2 pulse generator; Each number 2 an optical data parallel output from pulse generator in electrically N single photo diode; and Converted from the photodiode said electrical data in parallel receives one into Serial data comprises a serializer OFDM optical characterized by a device for the prevention of communication. According to Claim 13, Optical data inputted in Serial OFDM modulation receive a signal, converts it into a parallel signal, which outputs to the each modulator deserializer further included in which is similar to the characterized by optical OFDM for the prevention of communication device. According to Claim 13, Said 1:N distributor is connected between each modulator, capable of smoothing a performance of each subcarrier to a phase and amplitude of sub-carriers for differently controlling a further included in a control module is a pre-emphasis (pre-emphasis) which is similar to the characterized by optical OFDM for the prevention of communication device. According to Claim 13, An inverse discrete Fourier transform electric said discrete Fourier transform device of said electric device and is connected between, an inverse discrete Fourier transform device said electric light generated from OFDM symbols for removing unnecessary spectrum wide band filter is further included in which is similar to the characterized by optical OFDM for the prevention of communication device. According to Claim 13, Said number 1 and number 2 outputted from pulse generator pulse spectrum shape of Gaussian in the form to characterized by optical OFDM for the prevention of communication device. According to Claim 13, An inverse discrete Fourier transform electric said device a, N that in number correspond to the number of sub-carriers light frequency input from the respective sub-carrier transmitted for resolving the time interval 1 of N:N dispenser; Each 1:N is divided from the dispenser for performing phase shift of signals phase-shifting delay array module; Outputted from said phase shift delay array module for resolving inverse signals of N N:1 power coupler; Each N: light division back from coupler power 1 OFDM of symbols for carrying out time delay time delay array module; and Outputted from said time delay array module for resolving inverse signals N:1 includes power to the weighty member and is composed of optical characterized by OFDM for the prevention of communication device. According to Claim 13, Said electric discrete Fourier transform device a, N optical signal from the co on OFDM symbols 1 for: N dispenser; Said 1:N of signals is divided each from the dispenser for carrying out time delay time delay array module; Each outputted from said time delay array module for resolving signals N of 1:N dispenser; Each 1:N is divided from the dispenser for performing phase shift of signals phase-shifting delay array module; and Outputted from said phase shift delay array module for resolving inverse signals of N N:1 includes power to the weighty member and is composed of optical characterized by OFDM for the prevention of communication device. (A) that in number correspond to the number of sub-carriers light frequency N the respective sub-carrier transmitted from input 1 the time interval: N partitioning the video stream into a main step; (B) said each 1:N is divided into for performing phase shift of signals by extending a control signal of a step; Each in the output from the (b) step (c) said N signals: mounting substrate, and dividing the reverse 1; N in (d) said step (c): 1 OFDM light division reverse time delay of symbols the outputs; and N signals in the output from the (d) step (e) said: 1 includes partitioning the reverse are made out of a material which control for communication OFDM optical characterized by an inverse discrete Fourier transform method. (A')optical signal from the co N on the OFDM symbols; (B')time delay of signals is said N the outputs; Said step (c ') (b') in the output from the each signals 1:N partitioning the video stream into a main step; (D ') in said step 1 (c'): N is divided into for performing phase shift of signals by extending a control signal of a step; and Said step (e ') (d') in the output from the signals N:1 includes partitioning the reverse are made out of a material which OFDM optical characterized by discrete Fourier transform method for communication control.