JP2014093731A - Transmitter and optical transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmitter and an optical transmission system capable of securing the transmission of an optical signal even when some of a light-emitting units goes down.SOLUTION: A transmitter 2 comprises: a plane emission type semiconductor laser 20 for outputting an optical signal 201 to a core 30 of a multicore optical fiber 3 disposed on the incident side of the multicore optical fiber 3 having a plurality of cores 30 disposed in shape of a ring centering around a center axis 20a, said laser having first and second light-emitting units 210A, 210B as many as N times the number of cores 30 (N is an integer equal to or greater than 2); a rotary unit 26 for supporting the incident side of the multicore optical fiber 3 in such a way as to be able to rotate centering around the center axis 20a relative to the plane emission type semiconductor laser 20; and a transmission control unit 24 for selectively driving the first and the second light-emitting units 210A, 210B to have the optical signal 201 outputted.

Description

  The present invention relates to a transmission device and an optical transmission system.

  As the amount of information transmitted increases, optical transmission using optical fibers capable of high-speed and large-capacity transmission has become mainstream. Among them, in order to further improve the signal density, a multi-core optical fiber having a plurality of cores in one fiber has been developed and is considered to become the mainstream of information transmission in the future.

On the other hand, in order to reduce the height, a planar light emitting element array having light emitting elements of M columns × N rows in a plane,
Optical waveguide connection structure comprising a multistage optical waveguide array having M columns × N stages of cores and M × N mirrors provided at positions corresponding to M columns × N rows of light emitting elements of the multistage optical waveguide array Has been proposed (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2007-212687

  An object of the present invention is to provide a transmission device and an optical transmission system that can ensure the transmission of an optical signal even if some of the light emitting units fail.

  As one aspect of the present invention, the following transmission apparatus and optical transmission system are provided.

[1] The number of the plurality of cores that outputs an optical signal to the core of the optical transmission path provided on the incident side of the optical transmission path having a plurality of cores provided in an annular shape around the central axis. A light emitting device having N times (N is an integer of 2 or more) number of output units;
A rotating unit that rotatably supports the incident side of the optical transmission path with respect to the light emitting element around the central axis;
A controller that selectively drives the plurality of output units to output the optical signal;
A transmission device comprising:
[2] The rotating unit includes a driving unit that rotates the incident side of the optical transmission path relative to the light emitting element,
The control unit controls the rotating unit to optically couple the selectively driven output unit and the core to rotate the optical transmission path relative to the light emitting element.
The transmission device according to [1].
[3] A detection unit that detects a failure in the output unit and outputs a failure detection signal;
The control unit controls the rotating unit based on the failure detection signal.
The transmission device according to [2] or [3].
[4] An optical transmission line having a plurality of cores provided in an annular shape around the central axis;
The number of outputs of N times the number of the plurality of cores (N is an integer of 2 or more) provided coaxially with the central axis of the optical transmission line and outputting an optical signal to the core of the optical transmission line A light emitting device having a portion;
A rotating unit that rotatably supports the incident side of the optical transmission path with respect to the light emitting element around the central axis;
The plurality of output units are selectively driven to output the optical signal, and the optical transmission path is connected to the light emitting element so that the selectively driven output unit and the core are optically coupled. A control unit for performing control to rotate relatively,
Optical transmission system equipped with.
[5] The rotating unit includes a driving unit that rotates the incident side of the optical transmission path relative to the light emitting element,
The control unit controls the rotating unit to optically couple the selectively driven output unit and the core to rotate the optical transmission path relative to the light emitting element.
The optical transmission system according to [4].
[6] A detection unit that detects a failure in the output unit and outputs a failure detection signal,
The control unit controls the rotating unit based on the failure detection signal.
The optical transmission system according to [4] or [5].

  According to the present invention, transmission of an optical signal can be ensured even if a part of the light emitting units breaks down.

FIG. 1 is a sectional view showing a schematic configuration example of an optical transmission system according to the first embodiment of the present invention. FIG. 2 is a plan view of the surface emitting semiconductor laser. FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is a cross-sectional view of a multi-core optical fiber. FIG. 5 is a plan view of the light receiving element. 6A and 6B are diagrams showing a main part of the rotating unit, FIG. 6A is a diagram showing a state where the operation of the rotating unit is stopped, and FIG. 6B is a diagram showing a state where the rotating unit is rotating. FIG. FIG. 7 is a diagram for explaining functions of the transmission control unit and the reception control unit. FIG. 8 is a sectional view showing a schematic configuration example of the optical transmission system according to the second embodiment of the present invention. FIG. 9 is a cross-sectional view showing a schematic configuration example of an optical transmission system according to the third embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each figure, about the component which has the substantially same function, the same code | symbol is attached | subjected and the duplicate description is abbreviate | omitted.

[First Embodiment]
FIG. 1 is a sectional view showing a schematic configuration example of an optical transmission system according to the first embodiment of the present invention. FIG. 2 is a plan view of the surface emitting semiconductor laser, and FIG. 3 is a cross-sectional view taken along line AA of FIG. FIG. 4 is a cross-sectional view of a multi-core optical fiber. FIG. 5 is a plan view of the light receiving element. 6A and 6B are diagrams showing a main part of the rotating unit, FIG. 6A is a diagram showing a state in which the operation of the rotating unit is stopped, and FIG. 6B is a diagram showing a state in which the rotating unit is rotating. FIG.

  As illustrated in FIG. 1, the optical transmission system 1 includes a transmission device 2 that transmits a plurality of optical signals 201, a multicore optical fiber 3 that transmits a plurality of optical signals 201 transmitted from the transmission device 2, and a multicore light. And a receiving device 4 that receives a plurality of optical signals 201 transmitted by the fiber 3.

  The transmitter 2 is provided coaxially with the central axis 3a of the multicore optical fiber 3 on the incident side of the multicore optical fiber 3, and is N times the number of cores 30 (six in this embodiment) (this embodiment). The surface emitting semiconductor laser 20 having the first and second light emitting units 210A and 210B, and the incidence of the surface emitting semiconductor laser 20, the rotating unit 26, and the multi-core optical fiber 3. Support member 21 that supports the side end, light-emitting unit drive circuit 23 that drives the surface-emitting type semiconductor laser 20 via the switch unit 22, and a light-emitting unit that transmits to the first and second light-emitting units 210A and 210B A switch unit 22 that switches a signal output from the drive circuit 23, a rotating unit 26 that rotates the incident side of the multi-core optical fiber 3 relative to the apparatus 2 around the central axis 3a, and a rotation Comprising a rotating part drive circuit 25 for driving the 26, and a transmission control unit 24 that controls the switch unit 22, light emission drive circuit 23 and the rotation drive circuit 25. Here, the transmission control unit 24 is an example of a control unit, and the surface emitting semiconductor laser 20 is an example of a light emitting element.

  The receiving device 4 includes a light receiving element 40, a support member 41 that supports the light receiving element 40 and the end of the optical signal 201 on the output side of the multi-core optical fiber 3, an amplification circuit 42 that amplifies the output signal of the light receiving element 40, A reception control unit 43 that controls the amplifier circuit 42 and a memory 44 are provided. The transmission control unit 24 and the reception control unit 43 are connected by an electric transmission path 45. The reception control unit 43 also functions as a detection unit.

(Multi-core optical fiber)
As shown in FIGS. 1 and 4, the multi-core optical fiber 3 is formed around a plurality of (for example, six) cores 30 arranged at equal intervals in an annular shape around the central axis 3 a, The clad 31 has a refractive index lower than that of the core 30. The multi-core optical fiber 3 includes a silica glass-based optical fiber in which the core 30 and the clad 31 are made of quartz glass, a polymer clad optical fiber in which the core 30 is made of quartz glass, and the clad 31 is made of plastic, the core 30 and the clad A plastic optical fiber 31 formed of plastic can be used. The multi-core optical fiber 3 is an example of an optical transmission path. The optical transmission path may be an optical waveguide. Further, a protective layer may be provided on the outer periphery of the clad 31. The multi-core optical fiber 3 may be a single mode optical fiber or a multi mode optical fiber.

(Support member)
The support member 21 of the transmission device 2 is provided with a plate-like base portion 21a, a plate-like first support portion 21b that is provided so as to be orthogonal to the base portion 21a, and supports the surface emitting semiconductor laser 20, and a base portion A plate-like second support portion 21c that is provided so as to be orthogonal to 21a and supports the light incident side end of the multi-core optical fiber 3, and a rotation portion 26 that is provided so as to be orthogonal to the base portion 21a. And a plate-like third support portion 21d for supporting the fixing ring 261. On the support member 21, a wiring pattern (not shown) connected to an electrode 230 (to be described later) of the surface emitting semiconductor laser 20 and a rotating ring 262 of the rotating unit 26 is formed.

  The support member 41 of the receiving device 4 is provided so as to be orthogonal to the plate-like base portion 41a, the base portion 41a, and orthogonal to the plate-like first support portion 41b that supports the light receiving element 40 and the base portion 41a. And a plate-like second support portion 41c that supports the end portion of the multi-core optical fiber 3 on the light emission side. The support member 41 is formed with a wiring pattern (not shown) connected to an electrode (described later) of the light receiving element 40.

  Note that the two support members 21 and 41 are provided on a common base portion with the first, second and third support portions 21b, 21c and 21d on the transmission device 2 side, and the first and second on the reception device 4 side. The support portions 41b and 41c may be provided.

(Surface emitting semiconductor laser)
The surface emitting semiconductor laser 20 is a surface light emitting element having a mounting surface opposite to the light output surface that outputs the optical signal 201, and the first and second light emitting units 210A that output the optical signal 201 to the core. 210B. For example, as shown in FIGS. 1 and 2, the surface emitting semiconductor laser 20 is arranged on a substrate 200 made of n-type GaAs and on the substrate 200 at equal intervals in an annular shape with respect to the center 20 a of the substrate 200. A plurality of (for example, six) first light emitting portions 210A by mesa portions, and a plurality (for example, a plurality of first light emitting portions 210A arranged on the substrate 200 at equal intervals in an annular shape with respect to the center 20a of the substrate 200 ( For example, a total of twelve convex lenses 220 arranged on the output side of the optical signal 201 of each of the first and second light emitting units 210A and 210B, and a second light emitting unit 210B having six mesa units. Prepare. As the surface emitting semiconductor laser 20, a light emitting element that emits single mode or multimode laser light can be used. The surface emitting semiconductor laser 20 may have a configuration in which the convex lens 220 is not provided.

  As shown in FIG. 2, the surface emitting semiconductor laser 20 includes a p-side electrode 215 having an opening 215 a on the light output surface side of the first and second light emitting units 210 </ b> A and 210 </ b> B. A conductive pattern is formed so as to reach the electrode pad 217 via the wiring pattern 216. The opening 215a serves as an exit from which the optical signal 201 exits.

As shown in FIG. 3, each of the first and second light emitting units 210 _{</ b} > A and 210 _{</ b} > B arranged in an annular shape with respect to the center 20 a of the substrate 200 has an Al _x Ga _(1-x) As multilayer on the substrate 200. An n-type lower DBR layer 211 made of a film, an active layer 212 made of MQW, a current confinement layer 213 having an aperture 213a, a p-type upper DBR layer 214 made of an Al _x Ga _(1-x) As multilayer film, and an opening 215a The p-side electrode 215 is formed in this order. In the surface emitting semiconductor laser 20, an n-side electrode 230 is formed on the lower surface of the substrate 200. The electrode pad 217 and the n-side electrode 230 are connected to the switch unit 22 and the light emitting unit drive circuit 23 through the wiring pattern of the support member 21.

(Light receiving element)
The light receiving element 40 is a surface type light receiving element having a mounting surface on the side opposite to the light receiving surface that receives the optical signal 201. For example, a photodiode or the like can be used. As shown in FIGS. 1 and 5, the light receiving element 40 has an annular shape with respect to the center 400 a of the substrate 400 corresponding to the substrate 400 and the plurality of cores 30 of the multicore optical fiber 3 on the substrate 400. And a plurality of (for example, six) light receiving units 410 arranged in the base. In this embodiment, the light receiving unit 410 uses a GaAs PIN photodiode having excellent high-speed response. The PIN photodiode includes, for example, a P-layer, an I-layer and an N-layer that are PIN-bonded on a substrate 400 made of GaAs, a p-side electrode 411 connected to the P-layer, and an n-side formed on the N-layer. An electrode 414.

  As shown in FIG. 5, a p-side electrode 411 having an opening 411 a is formed in the light receiving unit 410, and a conductive pattern is formed from the p-side electrode 411 to the electrode pad 413 through the wiring pattern 412. Yes. In the light receiving portion 410, an n-side electrode 414 is formed so as to surround the p-side electrode 411, and a conductive pattern is formed from the n-side electrode 414 to the electrode pad 416 through the wiring pattern 415. . The opening 411a serves as an entrance through which the optical signal 201 enters. The electrode pads 413 and 416 are connected to the amplifier circuit 42 via the wiring pattern of the support member 41.

(Rotating part)
As shown in FIG. 1, the rotating unit 26 penetrates and holds the multi-core optical fiber 3 and rotates the incident side of the multi-core optical fiber 3, and the current supplied from the rotating unit drive circuit 25. A stationary ring 261 that rotates the rotating ring 262 by generating a magnetic field. FIG. 6 also illustrates portions not shown in FIG. Also,
The rotating ring 261 is an example of a driving unit.

  As shown in FIGS. 1, 6A, and 6B, the rotating ring 262 includes a magnet 265 having an N pole and an S pole on a surface facing the fixing ring 261. The magnet 265 is, for example, a permanent magnet, and a ferrite magnet or a neodymium magnet can be used. A plurality of magnets 265 may be provided on the rotating ring 262 in an annular shape.

  As shown in FIGS. 6A and 6B, the fixing ring 261 includes first and second armatures 263 and 264 provided on a surface facing the rotating ring 262. The first armature 263 includes a core 263a around which the coil 263c is wound and a core 263b around which the coil 263d is wound. The second armature 264 has a core 264a around which the coil 264c is wound and a core 264b around which the coil 264d is wound. Coil 263c and coil 263d, and coil 264c and coil 264d are connected to rotating unit drive circuit 25 so that the direction in which the direct current flows is opposite. Note that a plurality of first and second armatures 263 and 264 may be provided on the fixing ring 261 in an annular shape.

  The first and second armatures 263 and 264 are selectively supplied with current from the rotating unit driving circuit 25. When a current is supplied to the first armature 263, a magnetic field is generated with the S-pole on the fixing ring 261 side of the core 263a and the N-pole on the fixing ring 261 side of the core 263b, thereby attracting the magnet 265. Similarly, the second armature 264 generates a magnetic field having the S pole on the side of the fixing ring 261 of the core 264a and the N pole on the side of the fixing ring 261 of the core 264b to attract the magnet 265.

(Transmission control unit and reception control unit)
The transmission control unit 24 selectively drives the first or second light emitting unit 210A, 210B to output the optical signal 201, and when selectively driven, the first or second light emitting unit 210A, 210B The multi-core optical fiber 3 is controlled to rotate relative to the surface emitting semiconductor laser 20 so that the core 30 is optically coupled.

  The reception control unit 43 detects a failure in the first or second light emitting unit 210 </ b> A or 210 </ b> B and outputs a failure detection signal to the transmission control unit 24. Here, “failure” in the present embodiment refers to a case where the light amount of the optical signal 201 received by some of the light receiving units 410 is smaller than a threshold, and includes a case where the optical signal 201 cannot be received.

  Next, details of functions of the transmission control unit 24 and the reception control unit 43 will be described with reference to FIG. FIG. 7 is a diagram for explaining the functions of the transmission control unit 24 and the reception control unit 43. The switch unit 22 of the transmission device 2 is connected to the first terminal 22a connected to the light emitting unit drive circuit 23, the second terminal 22b connected to each first light emitting unit 210A, and each second light emitting unit 210B. And a movable piece 22d that connects the first terminal 22a to the second terminal 22b or the third terminal 22c.

  The transmission control unit 24 has a first mode for outputting the optical signal 201 from the first light emitting unit 210A and a second mode for outputting the optical signal 201 from the second light emitting unit 210B.

  The transmission control unit 24 performs output control of the optical signal 201 by switching between the first and second modes. That is, in the first mode, the transmission control unit 24 controls the switch unit 22 to connect the movable piece 22d to the second terminal 22b, and controls the light emitting unit driving circuit 23 to control each light emitting unit 210A. The optical signal 201 is output. In the second mode, the switch section 22 is controlled to connect the movable piece 22d to the third terminal 22c, and the light-emitting section drive circuit 23 is controlled to output the optical signal 201 from the second light-emitting section 210B.

  When the transmission control unit 24 switches between the first mode and the second mode, the transmission control unit 24 controls the rotation unit driving circuit 25 and rotates the multi-core optical fiber 3 by the rotation unit 26, so that the core 30 of the multi-core optical fiber 3 The first or second light emitting unit 210A or 210B to be optically coupled is selected.

  The reception control unit 43 is configured to transmit a failure detection signal to the transmission device 2 via the amplifier circuit 42 and the electric transmission path 45 when the failure of the first or second light emitting unit 210A or 210B is detected. Yes.

(Operation of the first embodiment)
Next, an example of the operation of the first embodiment will be described. First, assuming that the transmission control unit 24 of the transmission device 2 performs control in the first mode, the transmission unit 22d is controlled to connect the movable section 22d to the second terminal 22b and control the light emitting unit drive circuit 23. Then, the optical signal 201 is output from each first light emitting unit 210 </ b> A of the surface emitting semiconductor laser 20.

  The optical signal 201 output from the first light emitting unit 210 </ b> A is transmitted by the core 30 of the multi-core optical fiber 3 and received by the light receiving unit 410 of the light receiving element 40. The light receiving unit 410 that has received the optical signal 201 outputs an electrical signal corresponding to the light amount of the optical signal 201 to the amplifier circuit 42. The amplifier circuit 42 amplifies the electrical signal output from the light receiving unit 410. The reception control unit 43 converts the electrical signal output from the amplifier circuit 42 into digital data, and stores the digital data in the memory 44 as reception data.

  When the reception control unit 43 detects a failure of the first light emitting unit 210 </ b> A selected by the transmission control unit 24 based on the output signal of the amplification circuit 42, the reception control unit 43 transmits a failure detection signal via the electric transmission path 45. 2 to send.

  When receiving the failure detection signal, the transmission control unit 24 of the transmission device 2 switches from the first mode to the second mode. That is, the switch section 22 is controlled to connect the movable piece 22d to the third terminal 22c, and the light emitting section drive circuit 23 is controlled to transmit the optical signal 201 from each second light emitting section 210B of the surface emitting semiconductor laser 20. Output. In addition, the transmission control unit 24 of the transmission device 2 outputs a rotation signal to the rotation unit drive circuit 25.

  When receiving the rotation signal, the rotation unit drive circuit 25 stops the current supplied to the first armature 263 of the rotation unit 26 and supplies the current to the second armature 264. The second armature 264 generates a magnetic field with the current supplied from the rotating unit drive circuit 25 by generating a magnetic field having the S-pole on the rotating ring 262 side of the core 263a and the N-pole on the rotating ring 262 side of the core 264b. Generates an adsorbing force. The rotating ring 262 is rotated in the direction of the arrow as shown in FIG. As the rotating ring 262 rotates, the incident side of the multi-core optical fiber 3 held by the rotating ring 262 also rotates, and each core 30 is optically coupled to the second light emitting unit 210B.

  The optical signal 201 output from the second light emitting unit 210 </ b> B is transmitted by the core 30 of the multi-core optical fiber 3 and received by the light receiving unit 410 of the light receiving element 40.

  When switching from the second mode to the first mode, the movable piece 22d is connected to the second terminal 22b, and the multi-core optical fiber 3 is rotated based on the rotation signal output from the transmission control unit 24. The first light emitting unit 210A and the core 30 are optically coupled.

(Effects of the first embodiment)
According to the first embodiment, the following effects are obtained.
(A) Even if some of the first or second light emitting units 210A and 210B break down, transmission of an optical signal can be ensured.
(B) The first or second light emitting unit 210A, 210B can be switched with a simple configuration that does not use an optical element that reflects an optical signal.

[Second Embodiment]
FIG. 8 is a sectional view showing a schematic configuration example of the optical transmission system according to the second embodiment of the present invention. In the first embodiment, the rotating unit 26 is configured to rotate the multi-core optical fiber 3, but in the present embodiment, the rotating unit 26 is configured to rotate the surface emitting semiconductor laser 20. Further, a beam splitter 27 is provided, and the transmission device 2 is configured to detect a failure of the first or second light emitting unit 210A, 210B. The following description will focus on differences from the first embodiment.

  The transmitter 2A of the present embodiment is provided between the surface-emitting type semiconductor laser 20 and the surface-emitting type semiconductor laser 20 and the multicore optical fiber 3, and is output from the first and second light emitting units 210A and 210B. A light receiving element including a beam splitter 27 that reflects a part of the optical signal 201 in a direction orthogonal to the direction in which the optical signal 201 is output, and a plurality of light receiving units 281 that receive the reflected light 201 a reflected by the beam splitter 27. 28, a rotating unit 26 that rotatably supports the substrate 200, a detection unit 292 that detects a failure of the first and second light emitting units 210A and 210B, a support member 21, a switch unit 22, and a light emitting unit drive A circuit 23, a transmission control unit 24, and an amplifier circuit 291 are provided. The function of the detection unit 292 may be provided in the transmission control unit 24.

  The support member 21 of the transmission device 2 </ b> A supports a base portion 21 a that supports the light receiving element 28, a plate-like first support portion 21 b that supports the rotating portion 26, and an incident-side end portion of the multicore optical fiber 3. And a plate-like second support portion 21c.

  The rotating unit 26 includes a rotating ring 262 that holds the substrate 200 and a fixing ring 261 that is supported by the support member 21. The rotating unit 26 generates a magnetic field by the current supplied from the rotating unit driving circuit 25 to rotate the surface emitting semiconductor laser 20.

  The light receiving element 28 includes a plurality of (for example, six) light receiving portions 281 arranged on the substrate 280 in an annular shape at equal intervals. The light receiving unit 281 receives the reflected light 201a reflected by the beam splitter 27 and outputs an electrical signal corresponding to the amount of the reflected light 201a to the amplifier circuit 291. The amplifier circuit 291 amplifies the input electric signal and outputs it to the detection unit 292.

  The detection unit 292 outputs a failure signal to the transmission control unit 24 when the failure of the first or second light emitting unit 210A or 210B is detected based on the output signal input from the amplifier circuit 291. Here, “failure” in the present embodiment refers to a case where the amount of reflected light 201a received by some of the light receiving units 281 is smaller than a threshold, and includes a case where the reflected light 201a cannot be received.

(Operation of Second Embodiment)
Next, an example of the operation of the second embodiment will be described. First, if the transmission control unit 24 of the transmission device 2 performs control in the first mode, the first light emitting unit 210A of the surface emitting semiconductor laser 20 is controlled by controlling the switch unit 22 and the light emitting unit driving circuit 23. To output an optical signal 201.

  A part of the optical signal 201 output from the first light emitting unit 210A is reflected by the beam splitter 27 in a direction orthogonal to the direction in which the optical signal 201 is output. The reflected light 201 a reflected by the beam splitter 27 is received by the light receiving unit 281 of the light receiving element 28.

  The light receiving unit 281 that has received the reflected light 201a outputs an electrical signal corresponding to the amount of the reflected light 201a to the amplifier circuit 291. The amplifier circuit 291 amplifies the input electric signal and outputs it to the detection unit 292. The detection unit 292 outputs a failure detection signal to the transmission control unit 24 when it is determined that some of the light receiving units 281 have failed based on the output signal of the amplifier circuit 291.

  When receiving the failure detection signal, the transmission control unit 24 switches from the first mode to the second mode. That is, the switch unit 22 is controlled to output the optical signal 201 from the second light emitting unit 210B, and the rotating unit drive circuit 25 is controlled to rotate the rotating unit 26 and the surface emitting semiconductor laser 20. As the surface emitting semiconductor laser 20 rotates, the second light emitting unit 210B is optically coupled to the core 30 of the multi-core optical fiber 3.

(Effect of the second embodiment)
According to the second embodiment, the failure of the first or second light emitting unit 210A, 210B can be detected regardless of the configuration of the receiving device 4.

[Third Embodiment]
FIG. 9 is a cross-sectional view showing a schematic configuration example of an optical transmission system according to the second embodiment of the present invention. In the first embodiment, the transmitting device 2 directly optically couples the light emitting elements 210A and 210B and the core 30 of the multi-core optical fiber 3, but in the present embodiment, the transmitting device 2B includes the light emitting elements 210A. , 210B is reflected by the mirror 29 and the light emitting elements 210A, 210B and the core 30 are optically coupled. Hereinafter, a description will be given focusing on differences from the first embodiment.

  The transmission device 2B according to the present embodiment includes a surface-emitting type semiconductor laser 20 having first and second output units 210A and 210B that output an optical signal 201 in a direction orthogonal to the central axis 3a of the multicore optical fiber 3. The optical signal 201 output from the first and second light emitting units 210A and 210B is reflected in a direction orthogonal to the direction in which the optical signal 201 is output, and the first and second light emitting units 210A and 210B are reflected in the multi-core optical fiber. And a mirror 29 that is optically coupled to the three cores 30.

  The support member 21 of the transmission device 2B includes a base portion 21a that supports the surface emitting semiconductor laser 20, a plate-like second support portion 21c that supports an incident-side end portion of the multicore optical fiber 3, and a rotating portion 26. And a plate-like third support portion 21d.

(Effect of the third embodiment)
According to the third embodiment, the support member 21b for supporting the surface emitting semiconductor laser 20 can be omitted, and the surface emitting semiconductor laser 20 can be easily mounted.

[Modification]
The embodiments of the present invention are not limited to the above-described embodiments, and various modifications and implementations are possible without departing from the scope of the present invention. For example, in each of the above-described embodiments, the rotating unit 26 is described as rotating when a failure of the first and second light emitting units 210A and 210B is detected. However, the rotating unit 26 is rotated periodically. can do. Thereby, the effect of extending the lifetime of 1st, 2nd light emission part 210A, 210B can be anticipated.

  Further, in each of the above embodiments, the number of the first and second light emitting units 210A and 210B of the surface emitting semiconductor laser 20 and the number of cores 30 of the multi-core optical fiber 3 is six, but two may be used. Seven or more may be sufficient.

  Further, in each of the above embodiments, the number of light emitting units included in the surface emitting semiconductor laser 20 is the sum of the first and second light emitting units 210A and 210B, which is twice the number of cores 30 of the multicore optical fiber 3. However, the number of light emitting units included in the surface emitting semiconductor laser 20 may be three times or more the number of cores 30.

  Further, the core 30 may be disposed on the central axis 3 a of the multi-core optical fiber 3, and the light receiving unit 410 may be disposed on the center 4 a of the light receiving element 40. Thereby, the signal from the reception control unit 43 can be transmitted to the transmission control unit 24 via the multi-core optical fiber 3.

  In addition, the light receiving element 28 is provided between the surface emitting semiconductor laser 20 and the support member 21, and the beam splitter 27 is provided so as to be orthogonal to the optical signal 201 output from the first or second light emitting unit 210A or 210B. The optical signal 201 reflected so that the traveling direction is reversed by the beam splitter 27 may be received on the back side of the surface emitting semiconductor laser 20.

  Further, it is possible to omit some of the constituent elements of each of the above embodiments within the scope not changing the gist of the present invention.

  In addition, the constituent elements of the above-described embodiments can be arbitrarily combined within a range that does not change the gist of the present invention. For example, in the first embodiment, as described in the second embodiment, the detection unit and the light receiving element may be provided on the transmission device 2 side.

DESCRIPTION OF SYMBOLS 1 ... Optical transmission system 2, 2A, 2B ... Transmission apparatus, 3 ... Multi-core optical fiber, 3a ... Center axis line, 4 ... Reception apparatus, 20 ... Surface emitting semiconductor laser, 20a ... Center, 21 ... Support member, 21a ... Base part, 21b ... 1st support part, 21c ... 2nd support part, 21d ... 3rd support part, 22 ... Switch part, 22a ... 1st terminal, 22b ... 2nd terminal, 22c ... 3rd 22d ... movable section, 23 ... light emitting unit drive circuit, 24 ... transmission control unit, 25 ... rotation unit drive circuit, 26 ... rotation unit, 27 ... beam splitter, 28 ... light receiving element, 29 ... mirror, 30 ... core , 31 ... clad, 40 ... light receiving element, 40a ... center, 41 ... support member, 41a ... base part, 41b ... first support part, 41c ... second support part, 42 ... amplification circuit, 43 ... reception control part 44 ... Memory 45 ... Electric transmission 200, substrate, 201, optical signal, 201a, reflected light, 210A, first light emitting unit, 210B, second light emitting unit, 211, lower DBR layer, 212, active layer, 213, current confinement layer, 213a ... Aperture, 214 ... Upper DBR layer, 215 ... p-side electrode, 215a ... opening, 216 ... wiring pattern, 217 ... electrode pad, 220 ... lens, 230 ... n-side electrode, 261 ... fixing ring, 262 ... rotating ring, 263 ... first armature, 263a, 263b ... core, 263c, 263d ... coil, 264 ... second armature, 264a, 264b ... core, 264c ... coil, 264d ... coil, 265 ... magnet, 280 ... substrate, 281 ... light receiving part, 291 ... amplifying circuit, 292 ... detecting part, 400 ... substrate, 410 ... light receiving part, 411 ... p-side electrode, 411a ... opening, 412 ... arrangement Pattern, 413 ... electrode pad, 414 ... n-side electrode, 415 ... wiring pattern, 416 ... electrode pad

Claims (6)

N times the number of the plurality of cores that output an optical signal to the core of the optical transmission path provided on the incident side of the optical transmission path having a plurality of cores provided in an annular shape around the central axis ( N is a light emitting element having a number of output units),
A rotating unit that rotatably supports the incident side of the optical transmission path relative to the light emitting element about the central axis;
A controller that selectively drives the plurality of output units to output the optical signal;
A transmission device comprising: The rotating unit has a driving unit that rotates the incident side of the optical transmission path relative to the light emitting element,
The controller controls the rotating unit to optically couple the selectively driven output unit and the core to rotate the incident side of the optical transmission path relative to the light emitting element. ,
The transmission device according to claim 1. A detection unit that detects a failure of the output unit and outputs a failure detection signal,
The control unit controls the rotating unit based on the failure detection signal.
The transmission device according to claim 1 or 2. An optical transmission line having a plurality of cores provided in an annular shape around the central axis;
A light-emitting element that outputs an optical signal to the core of the optical transmission line, and has N times the number of the plurality of cores (N is an integer of 2 or more);
A rotating unit that rotatably supports the incident side of the optical transmission path relative to the light emitting element about the central axis;
A controller that selectively drives the plurality of output units to output the optical signal;
Optical transmission system equipped with. The rotating unit has a driving unit that rotates the incident side of the optical transmission path relative to the light emitting element,
The control unit controls the rotating unit to optically couple the selectively driven output unit and the core to rotate the optical transmission path relative to the light emitting element.
The optical transmission system according to claim 4. A detection unit that detects a failure of the output unit and outputs a failure detection signal,
The control unit controls the rotating unit based on the failure detection signal.
The optical transmission system according to claim 4 or 5.

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