Optical module

Technical Field

The present invention relates to an optical module, in detail, relates to a kind of the optical fiber connecting and realize miniaturization of the optical module.

Background Art

In recent years, with the increase of the traffic, in the trunk line in an optical transmission network system, the search for each of the optical fiber can transmit more large capacity of data transmission. As the way of transmission of this kind, used for realizing the improvement of the efficiency of frequency utilization and the far-distance transmission and multiple variable modulation technology of a coherent receiving technical attention to the Figures. In multivariable modulation mode, consider the light of the high function of the phase of the optical modulator must be realized.

The so-called optical modulator is a means for converting an electrical signal of the intensity of the light signal, the basic device of the optical communications, usually requiring a high speed, low loss, low power consumption, small size and high reliability. To realize light modulator of the modulation mode and directly into external modulation mode. In the high-speed, in the network-based, high speed and long distance from the transmitting these aspects, dominated external modulation mode. Adopting LiNbO₃ (lithium niobate, hereinafter called LN) dielectric material such as, by using the electro-optic effect (hereinafter called EO) of the semiconductor material or organic material, the use of the electric field absorption effect as the semiconductor material, the external modulation mode of the optical modulator.

In multivariable modulation mode in the optical modulator, the need to actively utilize the polarization of light, and the like, therefore, need to have their sub-wave, wave a passive optical circuit. However, compared with the glass material, because the LN, the optical characteristic of the semiconductor material from the low loss, and the optical fiber for the point of view of the connectivity of the inferior, there is therefore the task of the function.

As a low-loss to achieve passive optical circuit device, in a known Si quartz glass substrate or the like which is piled on a planar light wave circuit (Planar   Lightwave   Circuit: hereinafter referred to as PLC). Using the quartz glass material is quartz PLC of the excellent optical characteristic, and the quartz PLC LN dielectric material or semiconductor material, such as, organic material combined optical functional component of the technical concern.

In this optical modulator, quartz PLC chip and optical functional component of the light between the input/output unit of the chip are suitably connected and integrated. The integrated the 2 the structure of a chip of the above as a device (the following, a plurality of integrated device) to processing, will carry out the input/output external light of the optical fiber and a plurality of integrated devices are connected. As the use of a plurality of the optical modulator integrated device representative example, known is a quartz PLC LN waveguide combination with a modulator (hereinafter referred to as quartz-LN modulator).

Usually, when the in the communication device mounted on the plug-in board of the optical modulator is an optical device such as an optical, from the reliability, considering the gas barrier, and the like, contained in the composed of metal, ceramic, etc. the package body, housing and the like. Commonly used optical fiber with the optical device by the glass of the optical fiber connection part of the method of bonding is carried out. The package body or shell of the optical fiber through the conduit part is connected with the optical device. Most of the optical fiber applied to the metal film of the metal coating of the optical fiber, the conduit part and solder sealing, or use of adhesives, and the like fixed optical fibers, and the like for sealing.

In this manner, the fiber is fixed in the mounting for the optical device package body in the connection part and at two points of the drive pipe department. At this moment, because the package of the optical device the use of metallic material and the glass material, the coefficient of thermal expansion of the semiconductor material, different, therefore, corresponding with the temperature changes of the thermal stress applied to the optical fiber due to the tensile stress or compressive stress, so that the change takes place in the position of the optic fiber. Thereupon, there is a fiber itself or of the component for fixing the optical fiber and the mechanical reliability of the optical characteristic is reduced.

In order to correspond to the above-mentioned problem, so far, several method have been studied, for example, proposes a kind of the optical device part with the conduit between the connecting part of the buckling of the optical fiber to absorb a certain length of the structure of the position change (for example, referring to Patent literature 1). Quartz-LN modulator of the multi-chip integrated device is likewise, optical fiber become is fixed in the package body of the structure of the two points, the more than two chip also exists between a difference of a coefficient of thermal expansion, so that the thermal stress problems can be further increased.

Figure 1 of said quartz-LN in the structure of the modulator. Quartz-LN modulator 10 in package 11 in the is connected with the two end portions of the quartz PLC13a, 13b of the modulator LN 12. Optical fiber 14a, 14b in the connection end face 21a, 21b through the optical fiber connection part 20a, 20b and the quartz PLC13a, 13b is connected, and is fixed to the package body 11 drive pipe department of 22a, 22b in.

For example, the coefficient of thermal expansion of these components (units : × 10^-6/K) as shown in the table below.

[Table 1]

Especially when the use of stainless steel as a package material, stainless steel and quartz PLC the difference between the thermal expansion coefficient is larger than the optical fiber made of glass quartz connecting part and the difference of the PLC, the stress concentration on the quartz of the fiber optical waveguide of PLC and on the connecting part of the quartz PLC LN and optical waveguide of the optical waveguide of the modulator of the connecting part, thus the mechanical reliability is decreased. Even relatively LN modulator and is made of stainless steel of the package, can not become complete because the coefficient of thermal expansion of the same, therefore, the remaining problem of thermal stress.

In view of the above problems, in the quartz-LN modulator 10 in, in the optical fiber 14a, 14b between two points to fix, optical fiber buckling to absorb the thermal stress and generating as a result of the above tensile stress or compression stress. Therefore, in the package body required for buckling a certain amount of optical fiber a cage 23a, 23b. For example, useful when using the length direction 100-200mm the left and right of the package 11, the, optical fiber a cage 23a, 23b respectively 8-15mm the length of the left and right.

Therefore, when adopting the optical fiber in the package body buckling of the structure, the need for optical fiber connecting part and the duct part is ensured between the space of a certain length, the package body so as to become a obstacle to the miniaturization of the size of the main factors. If increased presses Qu Liang of the optical fiber, although the distance is shortened, but will exist or lead to the increase of the optical fiber bending loss, or lead to reduced reliability of such a problem.

Literature of the prior art

Patent literature

Patent literature 1: Japanese extra Kaiping 2-73207, the

Patent document 2: Japanese Patent section 3273490, the

Valeant literature

Valeant literature 1:N.Mekada.et   al, "  method   of   connection   waveguide-to-fiber Practical:   waveguide   endface   of   preparation   by direct   cutting   machine   and   ruby   beads   using   reinforcement,"   OPTICS APPLIED, pp. 5096-5102, Vol.29, No. 34, 1December   1990

Content of the invention

The aim of the invention is to, provide a light module, in the optical module, a plurality of integrated device, even if an installation, the connection of the optical fiber is also taken into consideration to realize miniaturization.

In order to realize this purpose, provide for a 1st in the package body holding the is connected with the two end portions of the planar light wave circuit (PLC) optical functional component for the integration of a plurality of integrated device to the optical module, characterized in that in each of the forms the useful PLC is connected with the optical functional component is formed on the optical waveguide of the optical fiber from the folded waveguide, the optical module has with the various said PLC connected to the same surface for the optical functional component is connected with the connection part with the optical fiber, is taken out from the package the opposed surface of the optical fiber.

2nd in a manner to accommodate the package body of the two ends is connected with a planar lightwave circuit (PLC) optical functional component of the integration of a plurality of integrated device to the optical module, characterized in that in the PLC in the form useful on 1st PLC is connected with the optical functional component is formed on the optical waveguide of the optical fiber from the folded waveguide, the optical module is connected with the 1st PLC in the same in a surface of the optical functional component is connected with the connection part with the optical fiber, from the package body on the same surface of the optical fiber is taken out.

3rd 2nd mode on the basis of the way, in the form of a PLC is connected to the 2nd PLC optical functional component is formed on the two optical waveguide at the folded waveguide.

6th in a manner to accommodate the package body is connected with a planar lightwave circuit (PLC) optical functional component of the integration of a plurality of integrated device to the optical module, characterized in that formed in the PLC used for connecting in the optical functional component is formed on the optical waveguide of optical fiber 1st from the folded waveguide, the optical module has with the PLC and in the same plane is connected with the optical functional component with the 1st 1st is connected with the part of the optical fiber, the optical module is used for the optical functional component of the, is connected with the opposite side of the plane of the PLC is connected with the optical functional component is formed on the optical waveguide of the part of the optical fiber is connected with the 2nd 2nd, from the package body on the same side of the 2nd 1st optical fiber and the optical fiber.

As mentioned above, according to the present invention, does not need to be in the past the conduit is arranged in the quartz PLC optical fiber between the cage parts, the package body can be realized on the length of the magnetized direction. Furthermore, quartz is connected to the PLC can improve the operability of the optical fiber, and can easily ensure the mechanical reliability based on thermal changes.

Description of drawings

Figure 1 is diagram of a conventional quartz-LN that the structure of the modulator.

Figure 2 is diagram of said 1st embodiment of this invention relates to a structure of the optical module.

Figure 3 is graph of said 2nd embodiment of this invention relates to a structure of the optical module.

Figure 4 is plan of said 3rd embodiment of the present invention relates to a structure of the optical module.

Figure 5A is Figure of said 4th embodiment of the present invention relates to a structure of the optical module.

Figure 5B is Figure of said embodiments relate to 4th the deformation of the optical module of the embodiment.

Figure 6A is Figure of said 5th embodiment of the present invention relates to a structure of the optical module.

Figure 6B is Figure of said embodiments relate to 5th the deformation of the optical module of the embodiment.

Figure 7A is Figure of said 1st embodiment of which relates to the mounting of the optical module of the 1st example of the method.

Figure 7B is Figure of said 1st embodiment of which relates to the mounting of the optical module of the 1st example of the method.

Figure 7C is Figure of said 1st embodiment of which relates to the mounting of the optical module of the 1st example of the method.

Figure 8A is Figure of said 1st embodiment of which relates to the mounting method of the optical module of the 2nd example.

Figure 8B is Figure of said 1st embodiment of which relates to the mounting method of the optical module of the 2nd example.

Figure 8C is Figure of said 1st embodiment of which relates to the mounting method of the optical module of the 2nd example.

Figure 9A is Figure of said 1st embodiment of which relates to the mounting of the optical module of the 3rd example of the method.

Figure 9B is Figure of said 1st embodiment of which relates to the mounting of the optical module of the 3rd example of the method.

Figure 10 is graph of said 6th embodiment of the present invention relates to a structure of the optical module.

Mode of execution

The following, with reference to detailed descriptions of embodiments of the present invention. In this embodiment, in order to install the quartz-LN optical module of the modulator is taken as an example for description, but as long as they are on the two ends is connected with a planar lightwave circuit (PLC) of an optical functional component for the integration of a plurality of integrated device, it is not limited to this. Furthermore, on the PLC, as the above-mentioned passive optical circuit, gathers the wave separator corresponding to the modulation mode, such as wave the polarization gathers is integrated in the waveguide between the light input/output unit. In the 1st embodiment shows a example, but in other embodiment, in order to simplify the description of which is omitted in the Figure. Furthermore, in addition to waveguides other than the optical waveguide of the optical signal, is also arranged on the LN modulator for performing modulation action of the electrode, etc., but it is also similarly the omitted in the Figure.

(1st embodiment)

Figure 2 said 1st embodiment of this invention relates to a structure of the optical module. Quartz-LN modulator 110 is connected with the two end portions of the quartz PLC113a, 113b of the modulator LN 112 a for the integration of a plurality of integrated device, is accommodated in the package 111 in. In the quartz PLC113a in is formed on the modulator LN 112 formed on a plurality of optical waveguide connecting the gathers the wave separator 132a, wave barrier polarization synthesizer 133 and 134. LN modulator 112 through which the output of the optical circuit, through the folded waveguide 131a and optical fiber 114a is connected. In the quartz PLC113b is formed with gathers the wave separator 132b, folded waveguide 131b, from optical fiber 114b input through these optical circuit, and LN modulator 112 is connected. By this, and the quartz PLC113a, 113b of the optical fiber is connected with the connecting part 120a, 120b in the same connecting end face 121a, 121b in the modulator LN 112 and optical fiber 114a, 114b is connected.

Optical fiber 114a is fixed in the as with quartz PLC113a optical fiber is connected with the connecting part of the connecting part 120a and the optical fiber connecting part 120a of the farther one of the opposed drive pipe department 122b is, optical fiber 114b is fixed to the optical fiber connection part 120b and the optical fiber connection part 120b of the farther one of the opposed drive pipe department 122a on. As a result, optical fiber 114a, 114b from the package 111 in the length direction of each of the opposed surface is taken out.

In the past, on the quartz PLC, the connecting surface of the quartz-LN modulator is connected with the optical fiber connecting surface of the part of the independent surface are opposed (in the two ends of the PLC). In the 1st embodiment, the modulator LN the connecting surface of the connecting surface of the part is connected with the optical fiber in the quartz PLC is set to the same plane, so as to achieve the following remarkable effect.

(1) because the quartz PLC113a, 113b R=2-3mm the radius is arranged on the left and right from the folded waveguide 131a, 131b, therefore increasing slightly the width of the quartz PLC, but it is not needed to the quartz PLC in the past with the conduit part of the cage is arranged between the optical fiber, can be realized in the direction to shorten the length of the package body. For example, as one embodiment, can be 140 mm to the left and right of the package body 120 mm left and right.

(2) in the past, in order to reduce the size of the optical fiber connection part, with a small-sized through the capillary integrated small-scale optical fiber connection parts, and the like to connect the optical fiber (for example, referring to Patent literature 1, valeant literature 1). According to the 1st embodiment, since the optical fiber connecting part 120a, 120b to the length of the body will not be affected by the length of the, so does not need to be connected by using small-sized parts. Furthermore, in order to take advantage of small-sized parts is connected to, needs to be used to ensure reliability of the complex design and the installation of the operation, according to the 1st embodiment, does not need these and the reliability can be maintained.

(3) in the package 111 in the interior of, the optical fiber 114a, 114b to fix the distance between the two points should be increased, so as to reduce or increase pressure qu Liang of the optical fiber buckling bend radius. In this way, since it is able to be fully guarantees -odd long, therefore, it is possible to easily ensure the mechanical reliability based on thermal changes.

(4) as with the end face of the quartz PLC LN modulator, the connecting surface of the optical fiber connection, in order to ensure low reflection, low-loss which was necessary to carry out the grinding processing. In the 1st embodiment, since only a single side of the quartz PLC can be grinding treatment, therefore, can also realize the reduction of manufacturing cost.

As shown in the 1st embodiment, when using LN modulator as the optical functional component, can be recognized not only shortens the package body, and is also capable of achieving a package body with the same size of the modulation functions of a plurality of integrated device. In other words, needless to say, the modulation function, also recognized in the past can be realized even if the package body size is not inferior as compared with a case of optical loss, optical waveguide characteristic extinction ratio, and the like.

In this embodiment, the use of a dielectric material other than LN, by using, for example, LiTaO3 (hereinafter referred to as "LT") LT modulator as an optical functional component, also can realize the same level of modulation functions and magnetized. Furthermore, as the semiconductor material by the use of a GaN GaN modulator, a modulator InP by InP, can also be use in effectively maintain their EO efficiency higher under the state of the same effect is obtained, using organic EO material and, also a high-speed response that can not reduce the advantage of the same effect is obtained.

Optical functional component is not limited to the 1st embodiment of the modulation function shown in, for example, by organic material can also be used, of a semiconductor material EO switching waveguide, the amount of the Si switching waveguide. At this moment, also can be in the maintenance of optical switching function accomplishes the state of the package body of the length of the magnetized direction.

(2nd embodiment)

Figure 3 said 2nd embodiment of this invention relates to a structure of the optical module. Quartz-LN modulator 210 is connected with the two end portions of the quartz PLC213,215 LN modulator of 212 a for the integration of a plurality of integrated device, is accommodated in the package body 211 in. In the quartz PLC213 LN is formed on the modulator 212 is formed on the optical fiber of the light wave guide passage 214a is connected from the folded waveguide 231. By this, and the quartz PLC213 connected optical fiber connection part 220 in the same connecting end face 221 of the modulator LN 212 and the optical fiber 214a is connected. Quartz PLC215 with a conventional quartz PLC the same structure.

In the 2nd embodiment, the modulator LN the connecting surface of the part is connected with the optical fiber with the connecting surface of the one side of the is only suitable for two quartz PLC in quartz PLC a quartz PLC. Through this structure, the 1st can be achieved in the embodiment of (1)-(4) in a portion of the effect.

Furthermore, in the 2nd embodiment, the package body 211 drive pipe department of 222 to one of the, from the package body 211 is taken out on the same side of the two optical fiber 214a, 214b. Therefore, when the quartz-LN modulator 210 carrying in the communication device when the plug-in board, can relax the connection with other devices on the restriction of the installation of the.

(3rd embodiment)

Figure 4 said 3rd embodiment of the present invention relates to a structure of the optical module. Quartz-LN modulator 310 is connected with the two end portions of the quartz PLC313,315 LN modulator of 312 a for the integration of a plurality of integrated device, is accommodated in the package body 311 in. In the quartz PLC313 LN is formed on the modulator 312 is formed on the optical fiber and optical waveguide of 314a, 314b connected at the folded waveguide 331,332. In the quartz PLC315 LN is formed on the modulator 312 is formed on two optical waveguide connection from the folded waveguide 333. By this, and the quartz PLC313 connected optical fiber connection part 320 in the same one side 321 of the modulator LN 312 and optical fiber 314a, 314b is connected.

Through this structure, the 1st can be achieved in the embodiment of (1)-(4) effect of. Furthermore, with the 2nd embodiment similarly, because can be from the package body 311 taken out on the same side of the two optical fiber 314a, 314b, therefore, when the carrying in the communication device can be reduced when the plug-in board mounting constraints.

Furthermore, through the quartz PLC315 from the folded waveguide 333, can be used for the modulation of modulator LN 312 of the effective length of the optical waveguide is increased to two times. Furthermore, through one of the optical fiber connecting element is connected with the optical fiber of quartz PLC, therefore it can further reduce the manufacturing cost.

(4th embodiment)

Figure 5A said 4th embodiment of the present invention relates to a structure of the optical module. Figure 5A of the light module and the 1st of the embodiment lies in the difference of the optical module with the quartz PLC413a, 413b is connected with the optical fiber connection part 420a, 420b. In the 1st embodiment, the two optical fiber is connected to the connecting portion of the two sides of the modulator and LN all provided with a structure, but in the 4th embodiment, the two optical fiber connection part is provided to the modulator LN 412 the same side.

With the 1st embodiment similarly, drive pipe department 422a, 422b is arranged in the package body 411 the opposed surface of the. However, in the 1st embodiment, two optical fiber removal opening is not in the symmetrical positions, but the 4th embodiment, is arranged in the symmetrical position of the opposed surface. Therefore, easy to manufacture package, when the carrying in the communication device when the plug-in board which is favorable for installation.

Figure 5B in the optical module, the two optical fibers is set not taking the package body 451 of the opposed surface of the in the length direction (1st side), which is arranged on the surface of the 1st adjacent side (side 2nd) next to the surface of the 1st.

By adopting this structure, the package body 451 in the interior of the optical fiber 454a, 454b point is fixed between the two locations, the fiber 454a, 454b applied bending of a relatively large radius. Therefore, buckling of the optical fiber can be applied with the same effect.

(5th embodiment)

Figure 6A with diagram 6B said 5th embodiment of the present invention relates to a structure of the optical module. In the 5th embodiment, opening of two optical fibers are not arranged in the package 511,551 of the opposed surface of the in the length direction (1st side), which is arranged on the side of the adjacent surface of the 1st (2nd side) near the center of the package body. In Figure 6A in the 2nd surface on the same plane, Figure 6B of the opposite surface of the surface of the 2nd are respectively provided with opening of the optical fiber.

By adopting the structure, and the 1st embodiment, compared with the four embodiments, can further shorten the package 511,551 to the conduit part of the length of the part. Furthermore, when the carrying in the communication device when the plug-in board, the connection of the other device in the of excess length of the optical fiber is facilitated, thereby easing the constraints on the installation.

(Mounting method of the optical module)

Then note to this embodiment of the mounting method of the optical module.

Figure 7A-7C said 1st embodiment of which relates to the mounting of the optical module of the 1st example of the method. Initially, as shown in Figure 7A shown, in the connection end face 121a, 121b is, to LN modulator 112 fixed quartz PLC113a, 113b and integrated. Integrated motherland a plurality of integrated device contained in the package 111 and fixed in (Figure 7B).

Furthermore, as shown in Figure 7C shown, from the package 111 drive pipe department of 122a, 122b is inserted in the connecting end face of the optical fiber is fixed on the optical fiber of the connecting members 114a, 114b. In the connected end surface 121a, 121b is, the optical fiber of the optical fiber is fixed to the connecting part 120a, 120b and the quartz PLC113a, 113b of the optical waveguide for self-aligning and is fixed. Finally, in drive pipe department 122a, 122b is fixed optical fiber 114a, 114b.

In the optical module in the past, part of the package body of the conduit is set between the quartz PLC transmit the optical fiber, the length is about 10 mm, for connecting optical fiber connecting part and the space of the optical waveguide is very narrow, the operability is poor. By adopting this embodiment, the fixed optical fiber 114a, 114b of the longer the distance between the attachment points, greatly improving the operability for connection.

Figure 8A-8C said 1st embodiment of which relates to the mounting method of the optical module of the 2nd example. Initially, as shown in Figure 8A shown, in the connection end face 121a, 121b is, to LN modulator 112 fixed quartz PLC113a, 113b and integrated. Furthermore, in the connection end face 121a, 121b is, the capillary in advance 124a, 124b and the quartz PLC113a, 113b self-aligning after the optical waveguide is carried out.

As shown in Figure 8B shown, capillary tube 124 is for an optical fiber in order to be able to advance the manner in which the core wire is inserted into the connecting member formed with a guide hole (for example, referring to Patent literature 2). The fixed capillary 124 motherland and integrate a plurality of integrated device contained in the package 111 and fixed in.

As shown in Figure 8C shown, from the package 111 drive pipe department of 122a, 122b is inserted into the optical fiber 114a, 114b, and inserted into the capillary tube 124a, 124b of and fixed in a guiding hole. Finally, in drive pipe department 122a, 122b optical fiber fixed in 114a, 114b.

By adopting this embodiment, when the fixed optical fiber 114a, 114b is, in the package 111 is not needed in the inside of the self-aligning operation, therefore, can greatly shorten the working time for connection.

Figure 9A and 9B said 1st embodiment of which relates to the mounting of the optical module of the 3rd example of the method. Initially, as shown in Figure 9A shown, in the connection end face 121a, 121b is, to LN modulator 112 fixed quartz PLC113a, 113b and integrated. Furthermore, in the connection end face 121a, 121b is, is connected with an optical fiber will be fixed part 120a, 120b of the optical fiber 114a, 114b in advance with the quartz PLC113a, 113b self-aligning after the optical waveguide is carried out. The fixed with an optical fiber 114 motherland and integrate a plurality of integrated device contained in the package 111 and fixed in.

As shown in Figure 9B shown, from the package body 111 to the inner side of the of drive pipe department 122a, 122b is inserted into the optical fiber 114a, 114b, and to the package 111 is LED out at the outer side of the. When the quartz-LN modulator 110 within the communication device mounted on the plug-in board of the, length of the optical fiber to 20-50cm left and right. By adopting this embodiment, since the fixed optical fiber 114a, 114b of the two is the distance between the attachment points is relatively long, therefore the optical fiber can be easily conducted through drive pipe department operation.

(6th embodiment)

Figure 10 said 6th embodiment of the present invention relates to a structure of the optical module. Quartz-LN modulator 610 is the quartz PLC613 and LN modulator 612 integrated by connecting a plurality of integrated device display, accommodated in the package body 611 in. In the quartz PLC613 LN formed on the of the modulator 612 formed on the optical fiber and optical waveguide 614a connecting from the folded waveguide 631. Therefore, in the same connection end face 621 will be within the quartz PLC613 LN connected with the modulator 612 and the use of optical fiber connection part 620a fixed fiber 614a is connected. Furthermore, in the LN waveguide 612 of the, with the quartz PLC613 is connected on the end face of the facing, is connected with the optical fiber connection part 620b integrated optical fiber 614b. From drive pipe department 622 take out the two optical fiber 614a, 614b.

In the past, two of a plurality of chip integrated module, the PLC is connected with the end face of the of the modulator is connected to the opposite end faces of the optical fiber, from the package required to be respectively in the length direction out of the opposed surface of the optical fiber. The 6th embodiment, the following effect can be achieved.

(1) because the quartz PLC613 R=2-3mm the radius is arranged on the left and right from the folded waveguide 631, therefore increasing slightly the width of the quartz PLC, without the need of the quartz PLC in the past with the conduit part of the optical fiber is arranged between the single add a cage, can thus be achieved in the direction to shorten the length of the body, that is, the miniaturization of the package body can be realized. For example, as one embodiment, a 6th embodiment, the two chip contained in the past can be a plurality of integrated module package length 120 mm length is 100 mm.

Furthermore, the 1st embodiment can be achieved as shown in (2), (4) the effect of the same. Shown on the 1st embodiment (3) effect, also inevitably increase the fixed optical fiber 614a the distance between the connection point of the, press of the optical fiber so as to reduce or increase qu Liang buckling bend radius.

Furthermore, in the 6th embodiment, package 611 drive pipe department of 622 to one of the, from the package body 611 is taken out on the same side of the two optical fiber 614a, 614b. Therefore, when the quartz-LN modulator 610 is carried in the communication device when the plug-in board, can relax the connection with other device on the restriction of the installation of the.