JP2008289060A - Redundant configuration optical transmission apparatus and optical switcher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce cost and improve operability while ensuring high reliability by using an optical switcher having an optical switching function and also an optical variable attenuation function. <P>SOLUTION: This redundant configuration optical transmission apparatus is provided with an optical switcher which inputs an optical signal outputted from an output port of a first optical unit to an input port 1, inputs an optical signal outputted from an output port of a second optical unit to each input port 2, and selects one of optical signals to output it to the output port. In the redundant configuration optical transmission apparatus, the optical switcher is configured to be set to one of first to fourth modes. During the first mode, the optical signal of the input port 1 is transmitted without loss and the optical signal of the input port 2 is shut off. During the second mode, a predetermined loss is applied to the optical signal of the input port 1 while shutting off the optical signal of the input port 2. During the third mode, a predetermined loss is applied to the optical signal of the input port 2 while shutting off the optical signal of the input port 1 and during the fourth mode, the optical signal of the input port 2 is transmitted without loss and the optical signal of the input port 1 is shut off. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a redundant configuration optical transmission apparatus and an optical switch for switching between active and standby in an optical transmission apparatus that processes an optical signal of an optical network system.

  An optical transmission device used in an optical network system is an optical unit having a plurality of input ports and a plurality of output ports. Each input optical signal is converted into an electrical signal, subjected to predetermined signal processing, and then converted into an optical signal again. Output. The optical unit also has a configuration in which signal processing is performed as an optical signal without optical / electrical conversion. In such an optical transmission device, there is a configuration in which a spare optical unit is arranged for signal relief when an optical unit fails or an optical unit is replaced, and the active / spare optical unit is switched.

  FIG. 9 shows a configuration example of a conventional redundant configuration optical transmission apparatus that switches between active and standby (Patent Document 1). In the figure, the redundant configuration optical transmission apparatus includes two optical units 11 and 12, and each of the optical units 11 and 12 is split into two optical signals S1 to Sn by optical splitters 13-1 to 13-n. Input to the input port. One of the two optical signals output from the output ports of the optical units 11 and 12 is selected by the optical switch 14-1 to 14-n corresponding to each output port, and output as the output optical signals S1 to Sn. Is done. Also, monitoring optical couplers 15-1 to 15-n and 15- (n + 1) to 15- (2n) are inserted into the output ports of the optical units 11 and 12, respectively, and branched by the respective monitoring optical couplers. Each optical signal is input to a corresponding photodetector 16-1 to 16-n, 16- (n + 1) to 16- (2n). The switching control circuit 17 receives the detection output of each photodetector, and selects a selection signal for selecting one of the two optical signals respectively output from the output ports of the optical units 11 and 12 according to each detection output. Output to the optical switches 14-1 to 14-n. The optical units 11 and 12 may be n × n optical switches, for example.

In such a conventional redundant configuration optical transmission apparatus, when the optical unit 11 is the active system and the optical unit 12 is the standby system, the optical switches 14-1 to 14-n usually select the output of the optical unit 11. The output of the redundant configuration optical transmission apparatus. Here, when an abnormality occurs in one output or several outputs of the optical unit 11, the switching control circuit 17 detects the photodetectors 16-1 to 16-n connected to the output ports of the optical unit 11. Based on the output, a selection signal for selecting the optical signal output from the standby optical unit 12 is output to the optical switch connected to the output port indicating the abnormal value. The optical switch that has received the selection signal performs switching so as to select the output of the optical unit 12 from the output of the optical unit 11, and rescues the optical signal.
Japanese Patent Laid-Open No. 9-238370

  In the conventional redundant configuration optical transmission apparatus, when the wavelengths of the output optical signals S1 to Sn are different from each other, these output optical signals are multiplexed by a wavelength multiplexer, and are combined into one optical fiber transmission line as a wavelength multiplexed optical signal. It is also possible to take a configuration to output. Here, it is assumed that the optical signal levels from the respective output ports are not the same and vary as shown in FIG. In general, the optical signal level of each wavelength so that the optical signal level of each wavelength of the wavelength multiplexed optical signal is uniform, or the optical signal level is uniform after passing through a wavelength dependent device such as an optical amplifier. Is adjusted. Therefore, when there is a variation between the optical signal levels as shown in FIG. 10, as shown in FIG. 11, an optical variable attenuator that adjusts each optical signal level on the output side of the optical switch 14-1 to 14-n. 18-1 to 18-n are arranged. The optical variable attenuators 18-1 to 18-n are controlled by the output control circuit 19 so that the optical signal levels are uniform.

  By the way, if the optical switchers 14-1 to 14-n and the optical variable attenuators 18-1 to 18-n are individually provided for each output port of the optical unit 11, there is a possibility of increasing costs and reducing reliability. was there.

  The present invention provides a redundant configuration optical transmission device and an optical switch that use an optical switch that combines an optical switching function and an optical variable attenuation function, and that can reduce costs and improve operability while ensuring high reliability. The purpose is to do.

  In the first invention, a plurality of n input optical signals S1 to Sn are branched and connected to n input ports of the first optical unit and the second optical unit, respectively. An optical signal output from each of the output ports is input to each input port 1, an optical signal output from the n output ports of the second optical unit is input to each input port 2, and one of them is selected. In the redundant configuration optical transmission apparatus having n optical switches that output as output optical signals S1 to Sn to each output port, the optical switch transmits the optical signal of the input port 1 without loss, and The first mode for blocking the optical signal, the second mode for giving a predetermined loss to the optical signal at the input port 1 while blocking the optical signal at the input port 2, and the input while blocking the optical signal at the input port 1 A third that gives a predetermined loss to the optical signal of port 2 Mode and a setting that can be configured to be either a fourth mode for blocking light signals transmitted without loss of light signal input port 2 input port 1.

  Here, three or more optical units are provided, the optical switch has three or more input ports, the first to fourth modes are set for any two input ports, respectively, and three or more to one light is set. It is good also as a structure which performs switching and optical variable attenuation | damping control.

  The optical switch includes at least two input ports and one output port, and includes a reflection angle variable mirror that reflects an optical signal from each input port and couples it to the output port. It is the structure controlled to each reflection angle corresponding to a 4th mode.

  The optical switch includes at least two optical interferometers, one input arm of the first optical interferometer is used as a first input port, and one output arm of the first optical interferometer is connected to the second optical interference. One input arm of the meter is connected, the other input arm of the second optical interferometer is used as the second input port, and one output arm of the second optical interferometer is used as the output port. ) (M is an integer of 3 or more) one of the input arms of the optical interferometer, and the other input arm of the mth optical interferometer is used as the mth input port. One output arm is used as an output port, and the optical path length of each optical interferometer is adjusted to control the transmission amount from the first to m-th input ports corresponding to the first to fourth modes to the output port. is there.

  The optical switch includes two input ports, one output port facing the first input port and not facing the second input port, and a movable mirror having an inclined surface at least at one end with respect to the moving direction. The movable mirror corresponds to the first to fourth modes according to the positional relationship between the optical signal from the first input port and the intersection position of the optical signal from the second input port. The optical signal from the second input port is blocked, the optical signal from the first input port is further blocked, and the inclined surface of the movable mirror is not connected. The optical signal from the second input port is reflected by the inclined surface, and a part or all of the optical signal from the second input port is coupled to the output port.

  The redundant configuration optical transmission apparatus of the present invention and the optical switch thereof can be realized by combining the optical switching function and the optical variable attenuation function while avoiding crosstalk by the configuration capable of setting the first to fourth modes. it can. As a result, it is possible to realize a redundant configuration optical transmission device and an optical switch that can reduce costs and improve operability while ensuring high reliability.

(First Embodiment of Redundant Configuration Optical Transmission Device of the Present Invention)
FIG. 1 shows a first embodiment of a redundantly configured optical transmission apparatus according to the present invention.
In the figure, the redundant configuration optical transmission apparatus according to the present embodiment includes two optical units 11 and 12, and the input optical signals S <b> 1 to Sn are branched into two by optical splitters 13-1 to 13-n, respectively. , 12 to each input port. One of the two optical signals respectively output from the output ports of the optical units 11 and 12 is selected by the optical switches 21-1 to 21-n with a variable optical attenuation function, and output optical signals S1 to Sn. Is output. Also, monitoring optical couplers 15-1 to 15-n and 15- (n + 1) to 15- (2n) are inserted into the output ports of the optical units 11 and 12, respectively, and branched by the respective monitoring optical couplers. Each optical signal is input to a corresponding photodetector 16-1 to 16-n, 16- (n + 1) to 16- (2n). The switching / output control circuit 22 inputs the detection output of each photodetector, selects one of each of the two optical signals output from the output ports of the optical units 11 and 12 according to each detection output, In addition, selection / output control signals for adjusting the optical signal level are output to the optical switches 21-1 to 21-n. The optical units 11 and 12 may be n × n optical switches, for example.

  In such a redundantly configured optical transmission apparatus, when the optical unit 11 is the active system and the optical unit 12 is the standby system, the optical switchers 21-1 to 21-n normally select the output of the optical unit 11 and configure the redundant configuration. The output of the optical transmission device. Further, when there is no failure or the like in the optical unit 11, the optical switchers 21-1 to 21-n function as optical variable attenuators, and adjust each output optical signal level under the control of the switching / output control circuit 22. Here, when an abnormality occurs in one output or several outputs of the optical unit 11, the switching / output control circuit 22 detects the photodetectors 16-1 to 16-n connected to the respective output ports of the optical unit 11. Based on the detected output, the optical switch connected to the output port showing the abnormal value is made to select the optical signal output from the standby optical unit 12, and each output optical signal level is adjusted. In this way, both optical signal switching and optical signal level adjustment can be performed using one optical switch 21.

  FIG. 2 shows the transmission characteristics of an optical switch with an optical variable attenuation function. In the figure, the horizontal axis indicates the control voltage to the optical switch 21, the vertical axis indicates the output optical signal level, the solid line indicates the transmission characteristics between the input port 1 for inputting the optical signal from the optical unit 11 and the output port, and the broken line indicates The transmission characteristic between the input port 2 which inputs the optical signal from the optical unit 12 and an output port is shown.

  In the region A where the control voltage of the optical switch 21 is small, the optical signal of the input port 1 is transmitted without loss, and the optical signal of the input port 2 is blocked (mode 1). Next, in the region B where the control voltage is increased, the loss of the optical signal at the input port 1 gradually increases while the optical signal at the input port 2 is blocked (mode 2). In the region C where the control voltage is further increased, the optical signal of the input port 1 is cut off, and the loss of the optical signal of the input port 2 gradually decreases (mode 3). In the region D where the control voltage is maximum, the optical signal of the input port 2 is transmitted without loss, and the optical signal of the input port 1 is blocked (mode 4). Between the control voltage regions B and C, the optical signals at the input ports 1 and 2 are crosstalk with each other. It is possible to widen the ranges of the regions B and C according to the allowable value of the crosstalk.

  In such a transmission characteristic, when the optical unit 11 is used as the active system, the control voltage of the region A is applied to the optical switch 21 and the optical signal level from the optical unit 11 is adjusted. A control voltage of region B is applied to the switch 21. On the other hand, when switching to the standby optical unit 12 due to a failure or the like, the control voltage in the region D is applied to the optical switch 21 and the optical signal level from the optical unit 12 is adjusted. A control voltage of region C is applied to 21.

(First embodiment of optical switch with variable optical attenuation function of the present invention)
FIG. 3 shows a first embodiment of an optical switch with an optical variable attenuation function according to the present invention. In the figure, an optical switch with a variable optical attenuation function has a reflection angle variable mirror 31 disposed between two input ports 1 and 2 and one output port via a collimating lens (not shown). It is a configuration. In this configuration, the optical signal from the input port 1 becomes a parallel light beam by the collimator lens, is reflected by the reflection angle variable mirror 31 after being propagated in space, and is coupled to the output port to become an output optical signal. Here, it is assumed that the reflection angle is controlled by applying the control voltage in the region A of FIG. 2 to the reflection angle variable mirror 31, and that the maximum output is obtained at the output port at the light beam incident angle θ 1 from the input port 1. . Next, when the control voltage in the region B in FIG. 2 is applied to the reflection angle variable mirror 31 to change the reflection angle and the light beam incident angle from the input port 1 is increased by Δθ1, the output port of the reflected light beam In this case, the coupling efficiency is reduced, and the output optical signal level is attenuated.

  Similarly, the control voltage in the region D in FIG. 2 is applied to the reflection angle variable mirror 31 to control the reflection angle, and the maximum output is obtained at the output port at the light beam incident angle θ2 from the input port 2. . 2 is applied to the reflection angle variable mirror 31 to change the reflection angle and increase the incident angle of the light beam from the input port 2 by Δθ2, the output port of the reflected light beam. In this case, the coupling efficiency is reduced, and the output optical signal level is attenuated.

  FIG. 4 shows a calculation example of the output optical signal level with respect to the deviation of the light beam incident angle of the optical system using such a reflection angle variable mirror 31. For example, when the incident angle deviation of the light beam is 0.1 degree, the light attenuation amount is about 15 dB. Therefore, the required light attenuation amount is set by changing the angle of the reflection angle variable mirror 31 within a range of about 0.1 degree. Can do. On the other hand, when the deviation of the incident angle of the light beam is 0.15 degrees or more, the output optical signal level is greatly reduced, and it can be considered that the light is blocked.

  Further, from the calculation example of FIG. 4, if | θ2−θ1 | is 0.15 degrees or more, it can be considered that there is almost no crosstalk due to the light beam from the input port 1. Conversely, even when the input port 1 is switched, it can be considered that there is almost no crosstalk due to the light beam from the input port 2. Therefore, when the variable optical attenuation function is realized by changing the angle of the reflection angle variable mirror 31, angle control of about 0.1 degree with respect to θ1 and θ2 is possible, and | θ2−θ1 | is 0.15 degrees or more. Should be set to be.

(Second Embodiment of Redundant Configuration Optical Transmission Device of the Present Invention)
In the configuration of the first embodiment of FIG. 1, when three or more optical units are provided, the redundant configuration can be easily expanded by setting the input ports of the optical switch 21 to three or more.

  FIG. 5 shows the transmission characteristics of an optical switch (3 inputs) with an optical variable attenuation function. In FIG. 5, the horizontal axis indicates the control voltage to the optical switch 21, the vertical axis indicates the output optical signal level, the transmission characteristic between the input port 1 and the output port, the transmission characteristic between the input port 2 and the output port, and the input port. 3 and the transmission characteristics between the output ports.

  With the control voltage in region A, the optical signal at input port 1 is transmitted without loss, and the optical signals at input ports 2 and 3 are blocked. Next, with the control voltage in region B, the loss of the optical signal at input port 1 is adjusted while the optical signals at input ports 2 and 3 are blocked. With the control voltage in region C, the optical signals at the input ports 1 and 3 are blocked, and the loss of the optical signal at the input port 2 is adjusted. With the control voltage in the region D, the optical signal of the input port 2 is transmitted without loss, and the optical signals of the input ports 1 and 3 are blocked. The above is the same as FIG. Further, the control voltage in region E cuts off the optical signals at the input ports 1 and 2 and adjusts the loss of the optical signal at the input port 3. With the control voltage in the region F, the optical signal of the input port 3 is transmitted without loss, and the optical signals of the input ports 1 and 2 are blocked.

  As described above, the method of realizing the optical switching function and the optical variable attenuation function corresponding to three or more optical units is the same as in the case of two optical units. Further, such an optical switch having three or more input ports can be easily handled by the configuration using the reflection angle variable mirror 31 shown in FIG.

(Second embodiment of optical switch with variable optical attenuation function of the present invention)
FIG. 6 shows a second embodiment of the optical switch with optical variable attenuation function of the present invention. In this embodiment, two optical interferometers (Mach-Zehnder interferometers) are cascade-connected to achieve the transmission characteristics shown in FIG. 2 between the input ports 1 and 2 and the output port, and the optical switching function and variable optical attenuation This is a configuration for realizing the function.

  In the figure, one input arm 1a of the first optical interferometer is used as an input port 1, and one output arm 1d is connected to one input arm 2b of the second optical interferometer. Furthermore, the other input arm 2a of the second optical interferometer is used as the input port 2, and one output arm 2c is used as the output port.

  In this configuration, when connecting from the input port 1 to the output port, the maximum optical output is obtained from the output arm 1d of the first optical interferometer, and from the input arm 2b of the second optical interferometer to the output arm 2c. The optical path length difference between the two optical interferometers is adjusted by the respective heaters 41 and 42 so as to obtain the maximum light output. A control voltage in the region A in FIG. 2 is applied to the heaters 41 and 42. At this time, the optical output from the input port 2 to the output port is almost blocked by the second optical interferometer.

  Next, when attenuation is applied to the optical signal from the input port 1, the input voltage is adjusted by applying the control voltage in the region B of FIG. 2 to the heater 41 of the first optical interferometer to adjust the optical path length difference. The amount of transmission from the arm 1a to the output arm 1d is adjusted. At this time, since the second optical interferometer is not changed, the output optical signal level from the input port 1 to the output port can be varied without causing crosstalk from the input port 2.

  Next, when switching from the input port 2 to the output port, first, the control voltage in the regions C and D of FIG. 2 is applied to the heater 41 of the first optical interferometer to adjust the optical path length difference. The transmission amount from the input arm 1a to the output arm 1d is cut off. On the other hand, the control voltage in the region D in FIG. 2 is applied to the heater 42 to adjust the optical path length difference so that the maximum optical output can be obtained from the input arm 2a of the second optical interferometer to the output arm 2c.

  Next, when attenuation is applied to the optical signal from the input port 2, the control voltage in the region C in FIG. 2 is applied to the heater 42 of the second optical interferometer to adjust the optical path length difference. The amount of transmission from the arm 2a to the output arm 2c is adjusted. At this time, since the first optical interferometer is not changed, the output optical signal level from the input port 2 to the output port can be varied without causing crosstalk from the input port 1.

  In order to realize the optical switching function and the optical variable attenuation function corresponding to three or more optical units in the optical switching device of the present embodiment, the optical interferometers are connected in multiple stages in the same manner as in the case of two stages. That's fine. That is, the other input arm of the m-th optical interferometer is used as the m-th input port, and one output arm of the m-th optical interferometer is used as the output port. The transmission amount from the mth input port to the output port is controlled.

(Third embodiment of optical switch with optical variable attenuation function of the present invention)
FIG. 7 shows a configuration example of a conventional optical switch. In FIG. 7 (1), the light beam from the input port 1 is coupled to the output port after spatial propagation to become an output optical signal. The collimating lens at the output end of the input port and the input end of the output port is omitted. On the other hand, the light beam from the input port 2 is arranged so as to be perpendicular to the light beam from the input port 1, and is not coupled to the output port after spatial propagation.

  In FIG. 7 (2), when the movable mirror 51 that moves in parallel is used to block the light beam from the input port 1 and the light beam from the input port 2 is reflected and coupled to the output port, the input from the input port 1 is input. Switching to port 2 is performed. In such a configuration, it is difficult to variably adjust the attenuation amount of the other light beam without crosstalk from the one light beam.

  FIG. 8 shows a third embodiment of the optical switch with optical variable attenuation function of the present invention. This embodiment is characterized in that a movable mirror 52 having an inclined surface with an angle Δθ is used at one end of the movable mirror 51 in the conventional configuration shown in FIG. The collimating lens at the output end of the input port and the input end of the output port is omitted.

  In FIG. 8 (1), the light beam from the input port 1 is coupled to the output port after spatial propagation to become an output optical signal. On the other hand, the light beam from the input port 2 is arranged so as to be perpendicular to the light beam from the input port 1 and is not coupled to the output port.

  In FIG. 8 (2), when the movable mirror 52 is translated to the position in the spot of the light beam from the input port 1, a part of the light beam from the input port 1 is coupled to the output port, and the spot of the light beam is obtained. A variable optical attenuation function corresponding to the relative position of the movable mirror 52 with respect to the diameter is realized. On the other hand, the light beam from the input port 2 is reflected by the inclined surface of the movable mirror 52 at an angle shifted by 2Δθ from the optimum incident angle with respect to the movable mirror 52 and is not coupled to the output port. That is, the light beam from the input port 2 is blocked.

  If the movable mirror 52 is translated in this state, the light beam from the input port 1 is completely blocked, and the light beam from the input port 2 is translated in the thickness direction of the movable mirror 52 with the same reflection angle. The amount of coupling to the output port increases. That is, a variable optical attenuation function for the light beam from the input port 2 is realized.

  In FIG. 8 (3), the movable mirror 52 is translated to a position where the light beam from the input port 1 is completely blocked, and the light beam from the input port 2 is moved to the inclined surface and the non-inclined surface (horizontal portion) of the movable mirror 52. ), The amount of coupling at the output port of the reflected light beam changes, and here also a light variable attenuation function for the light beam from the input port 2 is realized.

  In FIG. 8 (4), the movable mirror 52 is translated to a position where the light beam from the input port 1 is completely blocked, and the light beam from the input port 2 is moved on the non-inclined surface (horizontal portion) of the movable mirror 52. When reflected and coupled to the output port, switching from input port 1 to input port 2 is performed.

  In this way, by adjusting the position of the movable mirror 52 having the inclined surface, the input ports 1 and 2 coupled to the output port are switched, the output optical signal level from the input port 1 to the output port, and the input port 2 The output optical signal level to the output port can be varied.

  Further, by forming an inclined surface in which the inclination angle Δθ of the movable mirror 52 changes stepwise with respect to the insertion direction, and by forming the inclined surface into a curved surface, the input port 2 is changed to the output port depending on the insertion position. The output optical signal level can be easily varied.

1 is a diagram illustrating a first embodiment of a redundant configuration optical transmission apparatus according to the present invention. FIG. The figure explaining the transmission characteristic of the optical switch 21 with an optical variable attenuation function. The figure which shows 1st Embodiment of the optical switch with an optical variable attenuation | damping function of this invention. The figure which shows the example of calculation of the output optical signal level with respect to a light beam incident angle shift | offset | difference. The figure explaining the transmission characteristic of an optical switch (3 inputs) with an optical variable attenuation function. The figure which shows 2nd Embodiment of the optical switch with an optical variable attenuation | damping function of this invention. The figure which shows the structural example of the conventional optical switch. The figure which shows 3rd Embodiment of the optical switch with an optical variable attenuation | damping function of this invention. The figure which shows the structural example of the conventional redundant structure optical transmission apparatus. The figure explaining the dispersion | variation in the optical signal level of each output port of a redundantly configured optical transmission apparatus. The figure which shows the structural example of the conventional redundant structure optical transmission apparatus which has an optical variable attenuation | damping function.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11, 12 Optical unit 13 Optical branching device 14 Optical switch 15 Monitor optical coupler 16 Photo detector 17 Switching control circuit 18 Optical variable attenuator 19 Output control circuit 21 Optical switching device with optical variable attenuation function 22 Switching / output control Circuit 31 Reflection angle variable mirror 41, 42 Heater 51, 52 Movable mirror

Claims (8)

A plurality of n input optical signals S1 to Sn are branched and connected to n input ports of the first optical unit and the second optical unit, and output from n output ports of the first optical unit. Optical signals to be input to each input port 1, optical signals output from n output ports of the second optical unit are input to each input port 2, and one of them is selected and output to each output port In a redundant configuration optical transmission apparatus including n optical switch units that output as optical signals S1 to Sn,
The optical switch transmits the optical signal of the input port 1 without loss and blocks the optical signal of the input port 2, and the optical switch of the input port 1 while blocking the optical signal of the input port 2. A second mode for giving a predetermined loss to the optical signal, a third mode for giving a predetermined loss to the optical signal of the input port 2 while blocking the optical signal of the input port 1, and the light of the input port 2 A redundant configuration optical transmission apparatus characterized in that it can be set to any one of a fourth mode for transmitting a signal without loss and blocking an optical signal of the input port 1. The redundant configuration optical transmission device according to claim 1,
The optical switch includes three or more optical units, the optical switch has three or more input ports, and the first to fourth modes are set for any two input ports, respectively. A redundant configuration optical transmission apparatus characterized in that it is configured to perform switching and variable optical attenuation control. In the redundant configuration optical transmission apparatus according to claim 1 or 2,
The optical switch includes at least two input ports and one output port, and includes a reflection angle variable mirror that reflects an optical signal from each input port and couples it to the output port,
The redundant configuration optical transmission apparatus, wherein the reflection angle variable mirror is controlled to have respective reflection angles corresponding to the first to fourth modes. In the redundant configuration optical transmission apparatus according to claim 1 or 2,
The optical switch includes at least two optical interferometers, one input arm of the first optical interferometer is used as a first input port, one output arm of the first optical interferometer and the second light One input arm of the interferometer is connected, the other input arm of the second optical interferometer is used as the second input port, and one output arm of the second optical interferometer is used as the output port. m + 1) (m is an integer greater than or equal to 2) one of the input arms of the optical interferometer, and similarly, the other input arm of the mth optical interferometer is the mth input port. One output arm is used as an output port, and the optical path length of each optical interferometer is adjusted to control the transmission amount from the first to m-th input ports corresponding to the first to fourth modes to the output port. A redundant configuration optical transmission apparatus characterized by having a configuration. The redundant configuration optical transmission device according to claim 1,
The optical switch includes two input ports, one output port facing the first input port and not facing the second input port, and a movable mirror having an inclined surface at least at one end with respect to the moving direction. Prepared,
The movable mirror has a first input corresponding to the first to fourth modes according to a positional relationship between an optical signal from the first input port and an intersection position of the optical signal from the second input port. All or part of the optical signal from the port is coupled to the output port, the optical signal from the second input port is blocked, the optical signal from the first input port is blocked, and the inclined surface of the movable mirror Alternatively, the optical signal from the second input port is reflected on the non-inclined surface, and a part or all of the optical signal from the second input port is coupled to the output port. apparatus. In the optical switching device of the redundant configuration optical transmission device according to claim 1 or 2,
Comprising at least two input ports and one output port, comprising a reflection angle variable mirror that reflects an optical signal from each input port and couples it to the output port;
The variable reflection angle mirror is configured to be controlled to a reflection angle corresponding to each of the first to fourth modes. In the optical switching device of the redundant configuration optical transmission device according to claim 1 or 2,
At least two optical interferometers, one input arm of the first optical interferometer serving as a first input port, one output arm of the first optical interferometer and one input of the second optical interferometer; The other input arm of the second optical interferometer is used as the second input port, and one output arm of the second optical interferometer is used as the output port, or (m + 1) (m is 2 And the other input arm of the mth optical interferometer is used as the mth input port, and one output arm of the mth optical interferometer is connected to one input arm of the optical interferometer The output port is configured to control the amount of transmission from the first to mth input ports corresponding to the first to fourth modes to the output port by adjusting the optical path length of each optical interferometer. An optical switch. In the optical switching device of the redundant configuration optical transmission device according to claim 1,
Two input ports, one output port facing the first input port and not facing the second input port, and a movable mirror having an inclined surface with respect to the moving direction at least at one end,
The movable mirror has a first input corresponding to the first to fourth modes according to a positional relationship between an optical signal from the first input port and an intersection position of the optical signal from the second input port. All or part of the optical signal from the port is coupled to the output port, the optical signal from the second input port is blocked, the optical signal from the first input port is blocked, and the inclined surface of the movable mirror Alternatively, the optical switch is configured to reflect an optical signal from the second input port on a non-inclined surface and couple a part or all of the optical signal from the second input port to the output port.

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