JP2012063460A - Optical transmission and reception module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical transmission and reception module that reduces crosstalk between a transmission part and a reception part without being made large-sized.SOLUTION: The optical transmission and reception module 11A has a plurality of optical transmitters 31 and optical receivers 42 on a substrate 52, and is configured to multiplex by a multiplexer 33 and transmit optical signals of a plurality of wavelengths transmitted from the plurality of optical transmitters 31 through an optical fiber 32, and to demultiplex by a demultiplexer 40 and receive received optical signals of a plurality of wavelengths by the plurality of optical receivers 42 through an optical fiber 41. A guide roller 61 is provided between the optical transmitters 31 and multiplexer 33, and the optical receivers 42 and demultiplexer 40, and extra-length parts of the optical fibers 32, 41 are guided to the guide roller 61.

Description

  The present invention relates to an optical transceiver module used in an optical transceiver system or the like.

  The optical transceiver system includes an optical transceiver that is an optical transmission / reception module that can be inserted into and removed from a host system. The optical transceiver is inserted into a port of the host system and connected to the host system by connecting an electrical connector. Functions such as data transmission / reception and power supply are established (for example, see Patent Document 1).

  In recent years, there has been a demand for a large-capacity optical transmission / reception module of 10G super-wavelength multiplexing, but a reception signal with a small amplitude of about several tens mV output from a light receiving element drives transmission data with a large amplitude of about several volts. The reception sensitivity deteriorates due to the influence of crosstalk from the LD driver. Since the amount of crosstalk increases as the frequency increases and the transmitter / receiver units come closer to each other, circuit design and implementation show how this will be reduced as the bit rate increases and the optical transmitter / receiver becomes smaller. This is a design challenge. At the same time, circuit complexity and miniaturization are also required, and how to design space-saving is also important.

  As a technique for reducing the crosstalk, a phase difference V1 between a change point of data A transmitted via the electro-optical converter and a change point of data B received via the opto-electric converter is detected. A phase comparator, and a delay controller and a variable delay circuit that delay control transmission data A so that the detected phase difference V1 is equal to a value V0 that minimizes reception sensitivity degradation due to crosstalk between the transmission and reception units. And what suppresses the crosstalk amount between transmission / reception parts is known (for example, refer patent document 2).

  Further, the high frequency noise component superimposed on the output signal of the preamplifier or automatic gain amplifier of the reception unit is detected, and the high frequency component contained in the signal of the transmission unit is suppressed, thereby coupling from the transmission unit to the reception unit. There is also known a technique for reducing high-frequency noise components and reducing the influence of crosstalk when the transmitter and the receiver are integrated (see, for example, Patent Document 3).

  Further, the input electrical data signal is branched into two, one of the branched electrical data signals is converted into an optical signal and transmitted, and the other branched electrical data signal is substantially equal to the frequency characteristics of electrical crosstalk. The frequency is adjusted by a frequency characteristic adjustment circuit having the same frequency characteristics, and the electric signal whose frequency is adjusted is subtracted from the electric signal obtained by converting the optical signal received via the optical fiber, so that the transmission signal leaks into the reception signal. A technique for removing crosstalk is also known (see, for example, Patent Document 4).

JP 2010-72651 A JP 2007-266668 A JP 2007-221633 A JP-A-2005-27196

By the way, the technique of the above-mentioned patent document 2 is intended to prevent the fluctuation of the bit error rate due to the synchronization timing, and it is possible to suppress the deterioration of the reception sensitivity due to the crosstalk. Degradation will occur. In particular, in the case of wavelength multiplexing, since there are a plurality of transmission data, this influence is considered to increase. In addition, since the number of circuits must be prepared as many as the number of transmission units, the circuit size increases.
In the technique of Patent Document 3, in the case of a wavelength division multiplexing optical transceiver module, the influence of each receiving unit must be suppressed by each transmitting unit. Therefore, a complicated circuit for performing a lot of information processing is required, which hinders downsizing and speeding up.
Also in the technique of Patent Document 4, one branched electric data signal is converted into an optical signal and transmitted, and the other branched electric data signal has a frequency characteristic substantially equal to the frequency characteristic of electric crosstalk. A frequency characteristic adjusting circuit is required, resulting in a complicated circuit and an increased circuit size.

  An object of the present invention is to provide an optical transceiver module capable of reducing crosstalk between a transmission unit and a reception unit without causing an increase in size.

An optical transceiver module according to the present invention capable of solving the above-mentioned problems comprises a plurality of optical transmitters and optical receivers on a substrate, and has a plurality of wavelengths transmitted from the plurality of optical transmitters via an optical fiber. An optical transmission / reception module that multiplexes and transmits an optical signal with a multiplexer, demultiplexes the received optical signals with a plurality of wavelengths with a demultiplexer, and receives the optical signals with the plurality of optical receivers via an optical fiber. And
A surplus length adjusting member is provided between the optical transmitter and the multiplexer, and between the optical receiver and the duplexer, and the surplus length of the optical fiber is guided to the surplus length adjusting member. It is characterized by.

  In the optical transceiver module of the present invention, it is preferable that the plurality of optical transmitters and the plurality of optical receivers are arranged on opposite sides of the substrate.

  In the optical transceiver module of the present invention, at least one of the plurality of optical transmitters and the plurality of optical receivers is arranged in an arc shape centering on the optical transmitter or an electronic device connected to the optical receiver. It is preferable.

  In the optical transceiver module of the present invention, it is preferable that the extra length adjusting member is a guide roller around which the optical fiber can be wound.

  According to the optical transceiver module of the present invention, by guiding the extra length of the optical fiber to the extra length adjusting member provided between the optical transmitter and the multiplexer and between the optical receiver and the demultiplexer, Regardless of the position of the optical transmitter and optical receiver, the length of each optical fiber from the optical transmitter to the multiplexer (each optical path length), the length of each optical fiber from the demultiplexer to the optical receiver (each (Optical path length) can be adjusted equally without slack. Further, the optical transmitter and the optical receiver can be mounted at positions as far as possible, and the crosstalk can be reduced without increasing the size due to the addition of a circuit or complication.

It is a perspective view showing roughly an example of an optical transceiver system provided with an optical transceiver module concerning the present invention. It is a functional block diagram of the optical transmission / reception module which concerns on embodiment of this invention. It is a schematic perspective view which shows the internal structure of the optical transmission / reception module which concerns on embodiment of this invention. It is a schematic sectional drawing which shows the internal structure of the optical transmission / reception module which concerns on embodiment of this invention. It is a schematic plan view which shows the internal structure of the optical transmission / reception module which concerns on embodiment of this invention. It is a schematic plan view which shows the general internal structure of an optical transmission / reception module. It is a schematic perspective view which shows the internal structure of the optical transmission / reception module which concerns on other embodiment of this invention. It is a schematic plan view which shows the internal structure of the optical transmission / reception module which concerns on other embodiment of this invention.

Hereinafter, an example of an embodiment of an optical transceiver module according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the optical transceiver module 11 </ b> A of this embodiment is provided in the host system 14 of the optical transceiver system 12.

  The host system 14 includes a front panel 16, a board 18, a rail system 20, and an electrical connector 22. The optical transmission / reception module 11 </ b> A is mounted in the host system 14 through a port 16 a having an opening provided in the front panel 16. At the time of this insertion, the optical transmission / reception module 11 </ b> A is slid rearward between the rails while its level is maintained by the rail system 20. Then, the electrical plug 24 at the rear end of the optical transceiver module 11A is connected to the electrical connector 22 provided on the substrate 18.

Regarding optical coupling, the optical transceiver module 11A includes two optical ports 11a on the front surface thereof. The two optical ports 11a correspond to optical transmission and optical reception, respectively, and realize an asynchronous full-duplex communication function. For example, ten electric signals with a speed of 10 Gbps are multiplexed into four signals with a speed of 25 Gbps, and these four signals are transmitted as four optical signals having different wavelengths. On the receiving side, four optical signals with a speed of 25 Gbps are received, demultiplexed (wavelength separated), received by four optical receivers, and converted into electric signals with a speed of 25 Gbps, respectively. Thereafter, the four electric signals are converted into ten electric signals at a speed of 10 Gbps and transmitted to the host system 14.
The optical transmission / reception module 11A includes a box-shaped housing 26 of 128 × 72 × 14 mm ³ , and all the functions of signal multiplexing and separation described above are mounted in the housing 26.

  As described above, the optical transceiver module 11A has a pair of optical ports 11a collectively referred to as an optical receptacle on the front surface thereof. The optical transceiver module 11A has flanges 11c on both sides of the front wall 11b. The flange 11 c holds a screw 28 for fixing to the host system 14.

  The housing 26 of the optical transceiver module 11A includes a top surface portion 26a and a pair of side walls 26b. The top surface portion 26a is processed to be substantially flat. As a result, the top surface portion 26a can be in thermal and dense contact with the heat dissipating fins of the host system 14 and the heat dissipating effect can be enhanced. The housing 26 is made of metal, and is particularly preferably made of casting. The housing 26 is excellent in toughness and thermal stability (good heat dissipation characteristics).

  As shown in FIG. 2, the optical transceiver module 11A is a transmission IC (Tx-IC) that is an electronic device that converts ten electrical signals transmitted from the host system 14 into four electrical signals at a speed of 25 Gbps. ) 30 and an optical transmitter 31 that converts the four electrical signals from the transmission IC 30 into four optical signals.

  The optical transmitter 31 is composed of TOSA (Transmitter Optical Sub-Assembly) that converts four electrical signals at a speed of 25 Gbps into optical signals. The optical transmitter 31 has an LFI (Lead Frame Inserted) structure formed integrally with a plurality of electrodes, and a light emitting element is mounted on a device fixing surface provided with the electrodes.

  The wavelengths of the emitted light of the four optical transmitters 31 are different from each other, and the optical signals emitted from these four optical transmitters 31 are respectively multiplexed by optical multiplexers 32 (O-Mux). 33. Each of the optical fibers 32 is, for example, an optical fiber drawn from the multiplexer 33 and the optical transmitter 31 connected by an optical connector. These four optical fibers 32 have the same length. Yes. The optical signal sent to the multiplexer 33 is emitted from the multiplexer 33 toward one optical fiber connected to the optical port 11a by an optical connector.

  Even on the receiving side, the optical signal and the electric signal flow in opposite directions, but the same function as that on the transmitting side is executed. In the optical transmission / reception module 11A, an optical signal incident from one optical fiber connected to the optical port 11a via an optical connector enters a duplexer 40 including an optical demultiplexer (O-DeMux). In the duplexer 40, the incident optical signal is separated into four optical signals according to the wavelength and output.

  As the four wavelengths, for example, a combination of wavelengths at intervals of 5 nm between 1295 nm and 1310 nm is known. The respective optical signals separated by the demultiplexer 40 are incident on the corresponding optical receivers 42 by the optical fibers 41. Each of the optical fibers 41 is, for example, an optical fiber drawn from the duplexer 40 and the optical receiver 42 connected by an optical connector, and these four optical fibers 41 have the same length. .

  The optical receiver 42 is composed of a ROSA (Receiver Optical Sub-Assembly) that converts an incident optical signal into four electric signals with a speed of 25 Gbps, and generally includes a preamplifier. The optical receiver 42 has an LFI structure integrally formed with a plurality of electrodes, and a light receiving element is mounted on a device fixing surface provided with the electrodes. The four electric signals converted by the optical receiver 42 are each output to a receiving IC (Rx-IC) 43 that is an electronic device. In the receiving IC 43, the four electric signals are converted again into ten electric signals at a speed of 10 Gbps, and these ten electric signals are transmitted to the host system 14 via the electric connector 22.

Next, the internal structure of the optical transceiver module 11A will be described.
As shown in FIGS. 3 and 4, the housing 26 has an accommodation space 51, and a substrate 52 is accommodated in the accommodation space 51.
As shown in FIG. 5, a multiplexer 33, a demultiplexer 40, an optical transmitter 31, an optical receiver 42, a transmission IC 30 and a reception IC 43 are mounted on the substrate 52.

  The multiplexer 33 and the duplexer 40 are mounted side by side in the width direction on the front side which is the optical port 11a side of the substrate 52, and the transmission IC 30 and the reception IC 43 are arranged in the width direction almost at the center of the substrate 52. Implemented side by side. The optical transmitter 31 and the optical receiver 42 are disposed on the opposite sides of the substrate 52 with the center line CL before and after the substrate 52 interposed therebetween.

  The optical transmitter 31 is disposed at an arc-shaped position centered on the transmission IC 30 in a plan view and spaced from each other, and the optical receiver 42 is also an arc-shaped position centered on the receiving IC 43 in a plan view. Are spaced apart from each other. The transmission IC 30 and the optical transmitter 31, and the reception IC 43 and the optical receiver 42 are electrically connected by wiring patterns 53 formed on the substrate 52, respectively, and electric signals are transmitted through these wiring patterns 53.

  A guide roller (adjustable length adjustment) is provided between the optical transmitter 31 and the multiplexer 33 and between the optical receiver 42 and the duplexer 40 in the approximate center of the housing space 51 of the housing 26. Member) 61 is provided.

  As shown in FIG. 4, the guide roller 61 is rotatably supported at a position above the substrate 52 by a support shaft 62 provided in the thickness direction of the housing 26. The guide roller 61 requires the extra length portions of the optical fiber 32 between the multiplexer 33 and the optical transmitter 31 and the optical fiber 41 between the duplexer 40 and the optical receiver 42, respectively. Only the length is wound.

  Eight groove portions are formed on the peripheral surface of the guide roller 61, and the optical fibers 32 and 41 wound around the peripheral surface are respectively accommodated in the groove portions on the peripheral surface. 32 and 41 are aligned so as not to get entangled.

A pulley 64 rotatably supported by a support shaft 63 is provided in the vicinity of the connection position of the optical fibers 32 and 41 in the multiplexer 33 and the duplexer 40. The two optical fibers 32 and the four optical fibers 41 are respectively hung.
Further, pulleys 66 rotatably supported by a support shaft 65 are provided in the vicinity of the connection positions of the optical fibers 32 and 41 in the optical transmitters 31 and the optical receivers 42, respectively. Each optical fiber 32 and 41 connected to each optical transmitter 31 and each optical receiver 42 is hung one by one.

  The support shafts 62, 63, 65 that support the guide roller 61 and the pulleys 64, 66 are provided with a top surface portion 26 a on the housing 26, thereby preventing rotation of the guide roller 61 and the pulleys 64, 66. Is provided.

In order to assemble the optical transceiver module 11A having the above configuration, first, the optical fibers 32 and 41 are connected between the multiplexer 33 and the optical transmitter 31 and between the demultiplexer 40 and the optical receiver 42.
Next, the optical fibers 32 and 41 are hung on the pulleys 64 and 66, and the extra length is wound around the guide roller 61. Then, the guide roller 61 is turned so that the extra length of the optical fibers 32 and 41 is wound up to a necessary length so that the optical fibers 32 and 41 are not entangled, and the optical fibers 32 and 41 are wired without slack. As a result, the plurality of optical fibers 32 and 41 between the guide roller 61 and the multiplexer 33 and the duplexer 40 can be wired straight.
Thereafter, the top surface portion 26 a is attached to the housing 26. As described above, when the top surface portion 26 a is mounted on the housing 26, the rotation of the guide roller 61 and the pulleys 64 and 66 is restricted by the rotation preventing member 67. Therefore, after assembling, the guide roller 61 and the pulleys 64 and 66 are securely fixed without rotating due to vibration or the like, and the optical fibers 32 and 41 have an extra length portion in the housing 26 with the guide roller 61. It is guided and maintained in a wired state without slack.

Here, an optical transceiver module having a general structure will be described.
As shown in FIG. 6, in the general optical transceiver module 1, the multiplexer 33 and the duplexer 40 are mounted side by side in the width direction on the front side of the substrate 52 that is the optical port 11 a side. The transmitter IC 30 and the receiver IC 43 are mounted side by side in the width direction on the rear side, which is the electrical plug 24 side. Further, the optical transmitter 31 is mounted side by side in the width direction of the substrate 52 between the multiplexer 33 and the transmission IC 30, and the optical receiver 42 is disposed between the duplexer 40 and the reception IC 43. The substrates 52 are mounted side by side in the width direction.

  In the optical transceiver module such as an optical transceiver in the optical transceiver system, the size of the housing 26 is determined by the standard. In a situation where the accommodation space 51 in the housing 26 is limited by such a standard, if the optical transmission / reception module 1 having the mounting arrangement shown in FIG. 6 tries to realize wavelength multiplexing exceeding 10 Gbps, the optical transmitter 31 and the optical receiver 42 approaches and crosstalk tends to increase. Since this crosstalk is inversely proportional to the square of the distance, if the distance between the optical transmitter 31 and the optical receiver 42 approaches, the crosstalk increases rapidly.

On the other hand, according to the optical transceiver module 11A according to the above embodiment, the guide roller 61 provided between the optical transmitter 31 and the multiplexer 33 and between the optical receiver 42 and the duplexer 40 is used. By guiding the extra lengths of the optical fibers 32 and 41, the length of each optical fiber 32 from the optical transmitter 31 to the multiplexer 33 (each optical path length) regardless of the positions of the optical transmitter 31 and the optical receiver 42. ), The length (each optical path length) of each optical fiber 41 from the demultiplexer 40 to the optical receiver 42 can be adjusted equally without slack. Further, the optical transmitter 31 and the optical receiver 42 can be mounted as far as possible, and crosstalk can be reduced without increasing the size due to the addition of a circuit or complication.
In particular, since the plurality of optical transmitters 31 and the plurality of optical receivers 42 are arranged on opposite sides of the substrate 52, the effect of reducing crosstalk can be further enhanced.

  Moreover, since the plurality of optical transmitters 31 are arranged in an arc shape with the transmission IC 30 as the center, and the plurality of optical receivers 42 are arranged in an arc shape with the reception IC 43 as the center, each optical transmitter 31 is arranged. And the transmission IC 30, and between each optical receiver 42 and the reception IC 43, the length of the wiring composed of the wiring pattern 53 on the substrate 52 can be easily adjusted to be equal, and the wiring pattern 53 can be linear. And can be made the minimum length. Thereby, it is possible to obtain good transmission characteristics of electric signals between each optical transmitter 31 and the transmission IC 30 and between each optical receiver 42 and the reception IC 43.

  Further, since the guide roller 61 having a small thickness is used as the extra length adjusting member for guiding the extra length of the optical fibers 32 and 41 and adjusting the length, the extra thickness can be obtained with a thin and simple structure without increasing the cost. The length can be easily adjusted.

  In addition, you may provide the guide roller 61 and the pulleys 64 and 66 in the top | upper surface part 26a. In this case, the optical fibers 32 and 41 are routed around the guide roller 61 and the pulleys 64 and 66 provided on the top surface portion 26 a and wired, and then the top surface portion 26 a is attached to the housing 26.

  In the above-described embodiment, the case where the optical fibers 32 and 41 are each single core is illustrated, but the multiplexer 33 and the duplexer 40 in which the four optical fibers 32 and 41 are wired in parallel, respectively. And the guide roller 61, the optical fibers 32 and 41 may each be a 4-fiber ribbon. Then, the optical fibers 32 and 41 formed as the tape cores in this way may be separated into single wires at the winding points around the guide roller 61 and guided to the respective optical transmitters 31 and the respective optical receivers 42. In this way, it is possible to improve the wiring workability by facilitating the wiring of the optical fibers 32 and 41 between the multiplexer 33 / demultiplexer 40 and the guide roller 61. Further, in this case, the grooves corresponding to the optical fibers 32 and 41 on the peripheral surface of the guide roller 61 are not necessary, and the cost can be reduced by simplifying the shape.

Next, an optical transceiver module according to another embodiment will be described.
In addition, the same structure part as 11 A of optical transmission / reception modules of said embodiment attaches | subjects the same code | symbol, and abbreviate | omits description.

As shown in FIG. 7, the optical transmission / reception module 11B is provided with guide rollers 61 on each of the transmission side and the reception side.
Specifically, the optical transceiver module 11B is substantially in the center of the housing space 51 of the housing 26, between the optical transmitter 31 and the multiplexer 33, and between the optical receiver 42 and the duplexer 40. Between them, guide rollers 61A and 61B are provided, respectively. An extra length portion of the optical fiber 32 between the multiplexer 33 and the optical transmitter 31 is wound around the guide roller 61A by a necessary length, respectively. The extra length portion of the optical fiber 41 between the optical receiver 42 is wound by a necessary length.

Four groove portions are formed on the peripheral surfaces of the guide rollers 61A and 61B, and the optical fibers 32 and 41 wound around the peripheral surfaces are accommodated in the groove portions on the peripheral surfaces of the guide rollers 61A and 61B, respectively. The optical fibers 32 and 41 are aligned so as not to get entangled.
As a result, also in this optical transmission / reception module 11B, the optical fibers 32 and 41 have their extra length portions guided by the guide rollers 61A and 61B in the housing 26, adjusted in length, and wired without slack. The

  Thus, also in the case of this optical transceiver module 11B, guide rollers 61A and 61B are provided between the optical transmitter 31 and the multiplexer 33, and between the optical receiver 42 and the duplexer 40, and the optical fiber 32 is provided. , 41, the lengths of the optical fibers 32 from the optical transmitter 31 to the multiplexer 33 (each optical path length), the minute, regardless of the positions of the optical transmitter 31 and the optical receiver 42. The lengths (each optical path length) of each optical fiber 41 from the waver 40 to the optical receiver 42 can be adjusted equally without slack, and without increasing the size due to the addition or complexity of the circuit. Crosstalk can be reduced.

  In particular, since the two guide rollers 61A and 61B for guiding the extra length portions of the optical fiber 32 on the optical transmission side and the optical fiber 41 on the optical reception side are provided, the wiring by further simplifying the wiring of the optical fibers 32 and 41 is provided. Workability can be improved.

Next, an optical transceiver module according to still another embodiment will be described.
As shown in FIG. 8, in the optical transceiver module 11 </ b> C, the optical transmitter 31 is arranged along the one side edge of the substrate 52 on the one side edge side of the substrate 52 with respect to the transmission IC 30. Similarly, the optical receiver 42 is arranged in alignment with the other side edge of the substrate 52 on the other side edge side of the substrate 52 with respect to the reception IC 43.
If the optical transmitter 31 and the optical receiver 42 are arranged in this manner, the distance between the transmission IC 30 and each optical transmitter 31 and the distance between the reception IC 43 and each optical receiver 42 become non-uniform. It is preferable that the length of the wiring pattern 53 to be formed on the substrate 52 is made uniform on the substrate 52 to make the transmission distance of the electric signal uniform.

  And the pulley 66 is provided in the vicinity of the connection place of the optical fibers 32 and 41 in the optical transmitter 31 and the optical receiver 42 mounted in this way, respectively, and the optical fibers 32 and 41 from the front side of the substrate 52 are They are respectively hung on pulleys 66 and guided to the optical transmitter 31 and the respective optical receivers 42.

  The optical transmitter 31 and the optical receiver 42 are mounted obliquely in plan view so that the connection side of the optical fibers 32 and 41 faces the front side of the substrate 52 on which the multiplexer 33 and the duplexer 34 are provided. Is preferred. When mounted in this manner, the amount of bending of the optical fiber 32, 41 that is hung on the pulley 66 and guided to the optical transmitter 31 and the optical receiver 42 in the pulley 66 can be reduced as much as possible, and the optical fibers 32, 41 caused by bending are reduced. Transmission loss in the network can be suppressed.

  In this optical transmission / reception module 11C, guide rollers 61A and 61B are provided in the vicinity of the connection locations of the optical fibers 32 and 41 in the multiplexer 33 and the demultiplexer 40. The extra length of the optical fiber 32 between the multiplexer 33 and the optical transmitter 31 is wound around the guide roller 61A by a required length, and the optical fiber 32 is wired along one side edge of the substrate 52 to transmit each optical transmission. Guided to vessel 31. The extra length of the optical fiber 41 between the duplexer 40 and the optical receiver 42 is wound around the guide roller 61B by a necessary length, and is wired along the other side edge of the substrate 52 to receive each optical receiver. To the vessel 42.

  Thereby, also in this optical transmission / reception module 11C, the optical fibers 32 and 41 have their extra length portions guided in the guide rollers 61A and 61B in the housing 26, adjusted in length, and wired without slack. The

  As described above, also in the case of the optical transceiver module 11C, the guide rollers 61A and 61B are provided between the optical transmitter 31 and the multiplexer 33 and between the optical receiver 42 and the duplexer 40 to provide the optical fiber 32. , 41, the lengths of the optical fibers 32 from the optical transmitter 31 to the multiplexer 33 (each optical path length), the minute, regardless of the positions of the optical transmitter 31 and the optical receiver 42. The lengths (each optical path length) of each optical fiber 41 from the waver 40 to the optical receiver 42 can be adjusted equally without slack, and without increasing the size due to the addition or complexity of the circuit. Crosstalk can be reduced.

  Also in this optical transceiver module 11C, since two guide rollers 61A and 61B for guiding the extra length portions of the optical fiber 32 on the optical transmission side and the optical fiber 41 on the optical reception side are provided, the wiring of the optical fibers 32 and 41 is provided. Wiring workability can be improved by further facilitating the above.

  In the optical transceiver modules 11B and 11C according to the other embodiments, the optical fibers 32 and 41 are connected between the multiplexer 33 and the guide roller 61A and between the duplexer 40 and the guide roller 61B. Alternatively, each of the four core ribbons may be separated into a single wire around the guide rollers 61A and 61B and guided to each optical transmitter 31 and each optical receiver 42. In this way, the wiring workability can be improved by facilitating the wiring of the optical fibers 32 and 41 between the multiplexer 33 and the guide roller 61A and between the duplexer 40 and the guide roller 61B. In addition, it is possible to reduce the cost by eliminating the grooves corresponding to the optical fibers 32 and 41 on the peripheral surfaces of the guide rollers 61A and 61B.

  11A, 11B, 11C: optical transceiver module, 30: transmission IC (electronic device), 31: optical transmitter, 32, 41: optical fiber, 33: multiplexer, 40: duplexer, 42: optical receiver, 43: receiving IC (electronic device), 52: substrate, 61: guide roller (extra length adjusting member)

Claims (4)

A plurality of optical transmitters and optical receivers are provided on the substrate, and optical signals of a plurality of wavelengths transmitted from the plurality of optical transmitters through an optical fiber are combined and transmitted by a multiplexer. An optical transmission / reception module that demultiplexes optical signals of a plurality of wavelengths with a demultiplexer and receives the signals through an optical fiber with the plurality of optical receivers,
A surplus length adjusting member is provided between the optical transmitter and the multiplexer, and between the optical receiver and the duplexer, and the surplus length of the optical fiber is guided to the surplus length adjusting member. An optical transceiver module characterized by comprising: The optical transceiver module according to claim 1,
The optical transceiver module, wherein the plurality of optical transmitters and the plurality of optical receivers are disposed on opposite sides of the substrate. The optical transceiver module according to claim 1 or 2,
At least one of the plurality of optical transmitters and the plurality of optical receivers is arranged in an arc shape with an electronic device connected to the optical transmitter or the optical receiver as a center. Transmit / receive module. The optical transceiver module according to any one of claims 1 to 3,
The optical transmission / reception module, wherein the extra length adjusting member is a guide roller around which the optical fiber can be wound.

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