Aligning and directly optically coupling photodetectors to optical demultiplexer outputs in a multichannel receiver optical subassembly

A multi-channel receiver optical subassembly (ROSA) such as an arrayed waveguide grating (AWG), with outputs directly optically coupled to respective photodetectors such as photodiodes. In one embodiment, an AWG may be configured such that optical components of the AWG do not interfere with direct optical coupling, and the wire bonding points on the photodiodes may also be configured such that wire bonding does not interfere with direct optical coupling. The photodetectors may also be mounted on a photodetector mounting bar with a pitch sufficiently spaced to allow connection to floating grounds. A passive alignment technique may be used to determine the mounting locations on the photodetector mounting bar such that the photodetectors are aligned with the optical outputs.

MULTICHANNEL RECEIVER OPTICAL SUBASSEMBLY WITH IMPROVED SENSITIVITY

A multi-channel receiver optical subassembly (ROSA) such as an arrayed waveguide grating (AWG), with outputs directly optically coupled to respective photodetectors such as photodiodes. In one embodiment, the photodetectors are mounted on a photodetector mounting bar that includes a multiple conductive photodetector pads (PD pads). Each of the PD pads may be configured to receive a photodetector, and the PD pads are electrically isolated from ground such that the photodetectors are floating. The photodetector bar further includes multiple conductive transimpedance amplifier pads (TIA pads). Each of the TIA pads may be configured to receive a TIA, associated with one of the photodetectors, and to be electrically coupled to one or more ground ports of the TIA. The TIA pads are electrically connected to a common ground shared be each of said TIAs. 1. A photodetector mounting bar comprising:a plurality of conductive photodetector pads (PD pads), each of said PD pads configured to receive a photodetector, wherein said PD pads are electrically isolated from ground such that said photodetectors are at a floating ground; anda plurality of conductive transimpedance amplifier pads (TIA pads), each of said TIA pads configured to receive a TIA, associated with one of said photodetectors, and electrically coupled to one or more ground ports of said TIA, wherein said TIA pads are electrically connected to a common ground shared by each of said TIAs.2. The photodetector mounting bar of claim 1 , further comprising a plurality of conductive signal pads claim 1 , each of said signal pads configured to be wire bonded to one or more signal ports of said TIAs.3. The photodetector mounting bar of claim 2 , wherein said signal ports include a power port claim 2 , a positive differential voltage output port claim 2 , a negative differential voltage output port and a Received Signal Strength Indicator (RSSI) port.4. The photodetector mounting bar of claim 1 , wherein a cathode of said ...

Aligning and directly optically coupling photodetectors to optical demultiplexer outputs in a multichannel receiver optical subassembly

A multi-channel receiver optical subassembly (ROSA) such as an arrayed waveguide grating (AWG), with outputs directly optically coupled to respective photodetectors such as photodiodes. In one embodiment, an AWG may be configured such that optical components of the AWG do not interfere with direct optical coupling, and the wire bonding points on the photodiodes may also be configured such that wire bonding does not interfere with direct optical coupling. The photodetectors may also be mounted on a photodetector mounting bar with a pitch sufficiently spaced to allow connection to floating grounds. A passive alignment technique may be used to determine the mounting locations on the photodetector mounting bar such that the photodetectors are aligned with the optical outputs.

Test fixture with thermoelectric cooler and spring-operated holding pin

A test fixture generally includes a thermoelectric cooler (TEC) configured to regulate the temperature of a device under test (DUT). The test fixture may further include a device carrier configured to secure the DUT in a desired position relative to the TEC and a spring-operated pin configured to generate a desired contact pressure between the DUT and the TEC. The desired contact pressure may be selected to achieve a thermal coupling between the DUT and the TEC that maintains the temperature of the DUT at a desired operation level.

Multichannel receiver optical subassembly with improved sensitivity

A multi-channel receiver optical subassembly (ROSA) such as an arrayed waveguide grating (AWG), with outputs directly optically coupled to respective photodetectors such as photodiodes. In one embodiment, the photodetectors are mounted on a photodetector mounting bar that includes a multiple conductive photodetector pads (PD pads). Each of the PD pads may be configured to receive a photodetector, and the PD pads are electrically isolated from ground such that the photodetectors are floating. The photodetector bar further includes multiple conductive transimpedance amplifier pads (TIA pads). Each of the TIA pads may be configured to receive a TIA, associated with one of the photodetectors, and to be electrically coupled to one or more ground ports of the TIA. The TIA pads are electrically connected to a common ground shared be each of said TIAs.

TEST FIXTURE WITH THERMOELECTRIC COOLER AND SPRING-OPERATED HOLDING PIN

A test fixture generally includes a thermoelectric cooler (TEC) configured to regulate the temperature of a device under test (DUT). The test fixture may further include a device carrier configured to secure the DUT in a desired position relative to the TEC and a spring-operated pin configured to generate a desired contact pressure between the DUT and the TEC. The desired contact pressure may be selected to achieve a thermal coupling between the DUT and the TEC that maintains the temperature of the DUT at a desired operation level. 1. A test fixture comprising:a thermoelectric cooler (TEC) configured to regulate temperature of a device under test (DUT);a device carrier configured to secure said DUT in a desired position relative to said TEC; anda spring-operated pin configured to generate a desired contact pressure between said DUT and said TEC, wherein said desired contact pressure is associated with a desired thermal coupling between said DUT and said TEC.2. The test fixture of claim 1 , wherein a portion of said device carrier is interposed between said DUT and said TEC and configured to provide thermal coupling between said device under test and said TEC.3. The test fixture of claim 1 , wherein said spring-operated pin is calibrated to generate a spring force associated with said desired contact pressure at a threshold spring compression distance.4. The test fixture of claim 1 , wherein said desired contact pressure is associated with an operational temperature for said DUT.5. The test fixture of claim 4 , wherein said DUT is a laser diode and said operational temperature is associated with a desired transmission wavelength of said laser diode.6. The test fixture of claim 5 , wherein said laser diode is packaged as a mini-coaxial laser.7. The test fixture of claim 1 , further comprising a heat sink mounting block claim 1 , said TEC coupled to said heat sink mounting block.8. The test fixture of claim 1 , further comprising test probes electrically coupled to ...

Aligning and directly optically coupling photodetectors to optical demultiplexer outputs in a multichannel receiver optical subassembly

A multi-channel receiver optical subassembly (ROSA) such as an arrayed waveguide grating (AWG), with outputs directly optically coupled to respective photodetectors such as photodiodes. In one embodiment, an AWG may be configured such that optical components of the AWG do not interfere with direct optical coupling, and the wire bonding points on the photodiodes may also be configured such that wire bonding does not interfere with direct optical coupling. The photodetectors may also be mounted on a photodetector mounting bar with a pitch sufficiently spaced to allow connection to floating grounds. A passive alignment technique may be used to determine the mounting locations on the photodetector mounting bar such that the photodetectors are aligned with the optical outputs.

TEMPERATURE CONTROLLED MULTI-CHANNEL TRANSMITTER OPTICAL SUBASSEMBLY AND OPTICAL TRANSCEIVER MODULE INCLUDING SAME

A temperature controlled multi-channel transmitter optical subassembly (TOSA) may be used in a multi-channel optical transceiver. The multi-channel TOSA generally includes an array of lasers optically coupled to an arrayed waveguide grating (AWG) to combine multiple optical signals at different channel wavelengths. A temperature control system may be used to control the temperature of both the array of lasers and the AWG with the same temperature control device, e.g., a thermoelectric cooler (TEC). The multi-channel optical transceiver may also include a multi-channel receiver optical subassembly (ROSA). The optical transceiver may be used in a wavelength division multiplexed (WDM) optical system, for example, in an optical line terminal (OLT) in a WDM passive optical network (PON). 1. A multi-channel transceiver module comprising:a transceiver housing; an array of lasers configured to generate laser light, wherein each of the lasers are associated with different respective optical channels;', 'an arrayed waveguide grating (AWG) optically coupled to the array of lasers and configured to combine the laser light at different respective channel wavelengths; and', 'a temperature control system configured to control temperature of both the array of lasers and the AWG with a same temperature control device; and, 'a temperature controlled multi-channel transmitter optical subassembly (TOSA) located in the transceiver housing, the TOSA being configured to transmit a wavelength division multiplexed (WDM) optical signal on multiple channel wavelengths, the TOSA comprisinga multi-channel receiver optical subassembly (ROSA) located in the transceiver housing, the ROSA being configured to receive a wavelength division multiplexed (WDM) optical signal on multiple channel wavelengths.2. The multi-channel transceiver module of wherein the AWG is supported above the array of lasers in the TOSA.3. The multi-channel transceiver module of wherein the temperature control system ...

THERMALLY SHIELDED MULTI-CHANNEL TRANSMITTER OPTICAL SUBASSEMBLY AND OPTICAL TRANSCEIVER MODULE INCLUDING SAME

A thermally shielded multi-channel transmitter optical subassembly (TOSA) may be used in a multi-channel optical transceiver. The multi-channel TOSA generally includes an array of lasers optically coupled to an arrayed waveguide grating (AWG) to combine multiple optical signals at different channel wavelengths. A plurality of laser array thermal shields are thermally coupled to a temperature control device, such as a thermoelectric cooler (TEC), and thermally shield the respective lasers in the laser array in separate thermally shielded compartments. Each of the lasers may also be individually thermally controlled to provide a desired wavelength, for example, using a heater and/or cooler located in each thermally shielded compartment. The optical transceiver may be used in a wavelength division multiplexed (WDM) optical system, for example, in an optical line terminal (OLT) in a WDM passive optical network (PON). 1. A multi-channel transceiver module comprising:a transceiver housing; an array of lasers configured to generate laser light, wherein each of the lasers is associated with different respective optical channels;', 'a temperature control device; and', 'a plurality of laser thermal shields for thermally shielding the array of lasers, the laser thermal shields being thermally coupled to the temperature control device and defining a plurality of thermally shielded compartments, wherein each of the thermally shielded compartments receives and thermally shields a respective one of the lasers while allowing emitted laser light to pass out of the shielded compartments; and, 'a thermally shielded multi-channel transmitter optical subassembly (TOSA) located in the transceiver housing, the TOSA being configured to transmit a wavelength division multiplexed (WDM) optical signal on multiple channel wavelengths, the TOSA comprisinga multi-channel receiver optical subassembly (ROSA) located in the transceiver housing, the ROSA being configured to receive a wavelength ...

ALIGNING AND DIRECTLY OPTICALLY COUPLING PHOTODETECTORS TO OPTICAL DEMULTIPLEXER OUTPUTS IN A MULTICHANNEL RECEIVER OPTICAL SUBASSEMBLY

A multi-channel receiver optical subassembly (ROSA) such as an arrayed waveguide grating (AWG), with outputs directly optically coupled to respective photodetectors such as photodiodes. In one embodiment, an AWG may be configured such that optical components of the AWG do not interfere with direct optical coupling, and the wire bonding points on the photodiodes may also be configured such that wire bonding does not interfere with direct optical coupling. The photodetectors may also be mounted on a photodetector mounting bar with a pitch sufficiently spaced to allow connection to floating grounds. A passive alignment technique may be used to determine the mounting locations on the photodetector mounting bar such that the photodetectors are aligned with the optical outputs. 1. A multi-channel receiver optical subassembly (ROSA) comprising:a ROSA housing;an optical demultiplexer located in the ROSA housing, the optical demultiplexer including multiple optical outputs corresponding to multiple channels, the optical demultiplexer being configured to receive a wavelength division multiplexed (WDM) optical signal on multiple channel wavelengths and to demultiplex the WDM optical signal to produce demultiplexed optical signals on the multiple channel wavelengths, respectively; andan array of photodetectors located in the ROSA housing, the array of photodetectors aligned with and directly optically coupled to the multiple optical outputs, respectively, of the optical demultiplexer.2. The multi-channel ROSA of wherein the optical demultiplexer includes an arrayed waveguide grating (AWG).3. The multi-channel ROSA of wherein the array of photodetectors are mounted on a photodetector mounting bar.4. The multi-channel ROSA of wherein the array of photodetectors includes a plurality of PIN photodiodes and a plurality of transimpedance amplifiers (TIAs) mounted on the photodetector mounting bar claim 3 , the PIN photodiodes being electrically connected to respective ones of the ...

Techniques for indirect optical coupling between an optical input/output port of a subassembly housing and an arrayed waveguide grating (awg) device disposed within the same

Techniques for flexible coupling between an optical coupling receptacle/port of an optical transceiver housing and optical components within the same are disposed. In an embodiment, an optical transceiver housing includes an intermediate fiber with a first end optically coupled to an optical coupling port and a second end optically coupled to a multiplexer/de-multiplexer device, e.g., an arrayed waveguide grating (AWG) device, PLC splitter, and so on. The intermediate fiber may be routed in the transceiver housing in a manner that and the radius of the bends may be optimized to reduce fiber bending losses. The techniques herein are equally applicable to both ROSA and TOSA modules and may be utilized to achieve flexible coupling for multi-channel transceiver devices.

Thermally shielded multi-channel transmitter optical subassembly and optical transceiver module including same

A thermally shielded multi-channel transmitter optical subassembly (TOSA) may be used in a multi-channel optical transceiver. The multi-channel TOSA generally includes an array of lasers optically coupled to an arrayed waveguide grating (AWG) to combine multiple optical signals at different channel wavelengths. A plurality of laser array thermal shields are thermally coupled to a temperature control device, such as a thermoelectric cooler (TEC), and thermally shield the respective lasers in the laser array in separate thermally shielded compartments. Each of the lasers may also be individually thermally controlled to provide a desired wavelength, for example, using a heater and/or cooler located in each thermally shielded compartment. The optical transceiver may be used in a wavelength division multiplexed (WDM) optical system, for example, in an optical line terminal (OLT) in a WDM passive optical network (PON).

Photodetectors aligning and coupling optical demultiplexer outputs

Justering og kobling af fotodetektorer med optiske demultiplekser-udgange

Multichannel receiver optical subassembly with improved sensitivity

A multi-channel receiver optical subassembly (ROSA) such as an arrayed waveguide grating (AWG), with outputs directly optically coupled to respective photodetectors such as photodiodes. In one embodiment, the photodetectors are mounted on a photodetector mounting bar that includes a multiple conductive photodetector pads (PD pads). Each of the PD pads may be configured to receive a photodetector, and the PD pads are electrically isolated from ground such that the photodetectors are floating. The photodetector bar further includes multiple conductive transimpedance amplifier pads (TIA pads). Each of the TIA pads may be configured to receive a TIA, associated with one of the photodetectors, and to be electrically coupled to one or more ground ports of the TIA. The TIA pads are electrically connected to a common ground shared be each of said TIAs.