JP2015115657A - Optical transmission system and receiving terminal station device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve energy efficiency of an optical transmission system.SOLUTION: An optical transmission system 10 includes: an active system optical transmission path 20; a standby system optical transmission path 21; a first terminal station device 11A as a transmission terminal station; and a third terminal station device 11C as a reception terminal station. The third terminal station device 11C includes: a transponder 22; an electric power processing unit 23 that photoelectrically converts an input optical signal and stores electric power; an optical switch 24 and a monitoring control unit 25. During normal operation, the monitoring control unit 25 controls the optical switch 24 to output an optical signal from the active system optical transmission path 20 to the transponder 22 and output an optical signal from the standby system optical transmission path 21 to the electric power processing unit 23. When a failure occurs at the active system optical transmission path 20, the monitoring control unit 25 controls the optical switch 24 to output an optical signal from the active system optical transmission path 20 to the electric power processing unit 23 and output an optical signal from the standby system optical transmission path 21 to the transponder 22.

Description

  The present invention relates to an optical transmission system that transmits and receives an optical signal through an optical transmission line.

  Photoelectric conversion using sunlight and silicon (Si) solar cells generally has a power conversion efficiency as low as 20% or less. However, photoelectric conversion using a combination of a laser beam and a light receiving element of an appropriate material is as high as about 30%. Power conversion efficiency can be obtained. Recently, semiconductor laser light sources that can output several watts have been commercialized, and if these light sources and optical fibers are used, it is possible to supply power of up to 1 W at maximum. By using such an optical power feeding technology, when a large number of extremely low power DC devices such as remote communication devices and sensors are driven, power feeding can be performed more efficiently than conventional metal power feeding (optical power feeding). For the technology, see, for example, Patent Document 1).

JP 2005-198396 A

  Incidentally, a WDM (Wavelength Division Multiplexing) optical transmission system may have a redundant configuration of an optical signal line for the purpose of improving the reliability of the network. As a redundant configuration in the WDM optical transmission system, an optical unidirectional path switched ring (OUPSR) system in which redundancy of an optical transmission path is configured by one set of transponders, and two sets of transponders are used to increase the reliability of the optical transmission path. A UPSR (Unidirectional Path Switched Ring) system that configures redundancy is employed. In a network employing a redundant configuration, optical signals are sent to both the active and standby optical transmission lines. During normal operation, the optical signal receiving station outputs the optical signal from the active optical transmission line to the client device, and discards the optical signal from the standby optical transmission line. When a failure such as disconnection occurs in the active optical transmission line, the receiving station outputs an optical signal from the standby optical transmission line to the client device. Thereby, the network reliability can be improved.

  However, when the optical signal line redundancy is configured in the network, the power for maintaining the standby optical signal line is discarded during normal operation. As the number of redundant lines increases, the discarded power increases and the energy efficiency in the network decreases.

  The present invention has been made in view of such circumstances, and an object of the present invention is to improve energy efficiency in an optical transmission system in which an optical signal line is configured redundantly by an active transmission line and a standby optical transmission line.

  In order to solve the above-described problems, an optical transmission system according to an aspect of the present invention includes an optical transmission path configured redundantly by an active optical transmission path and a standby optical transmission path, an active optical transmission path, and a standby optical path. A transmission terminal station apparatus that transmits an optical signal to both of the transmission paths and a reception terminal station apparatus that receives the optical signals from both the working optical transmission path and the standby optical transmission path are provided. The receiving terminal device includes an optical signal processing unit that performs predetermined signal processing on the input optical signal, a power processing unit that photoelectrically converts the input optical signal to store power, an active optical transmission line, and a standby system An optical switch that switches the output destination of each optical signal from the optical transmission path between the optical signal processing unit and the power processing unit, and a control unit that controls the optical switch. During normal operation, the active optical transmission The optical switch is controlled so that the optical signal from the optical path is output to the optical signal processing unit and the optical signal from the standby optical transmission line is output to the power processing unit. And a control unit that controls the optical switch to output the optical signal from the optical system transmission line to the power processing unit and to output the optical signal from the standby optical transmission line to the optical signal processing unit.

  Another aspect of the present invention is a receiving terminal apparatus. This device is a receiving terminal device that receives an optical signal from both a redundant working optical transmission line and a standby optical transmission line, and an optical signal processing unit that performs predetermined signal processing on the optical signal; A power processing unit that photoelectrically converts an input optical signal to store electric power, and an output destination of each optical signal from the active optical transmission line and the standby optical transmission line, the optical signal processing unit and the power processing unit An optical switch that can be switched between, and a control unit that controls the optical switch. During normal operation, the optical signal from the active optical transmission line is output to the optical signal processing unit, and the optical signal from the standby optical transmission line is output. The optical switch is controlled so that the signal is output to the power processing unit, and when a failure occurs in the active optical transmission line, the optical signal from the active optical transmission line is output to the power processing unit, and the standby optical transmission line To output the optical signal from the optical signal processor to the optical signal processor. And a control unit for controlling the pitch.

  Yet another embodiment of the present invention is also an optical transmission system. This optical transmission system includes an optical transmission line configured redundantly by an active optical transmission line and a standby optical transmission line, and a transmission terminal station that transmits an optical signal to both the active optical transmission line and the standby optical transmission line. And a receiving terminal device that receives optical signals from both the active optical transmission line and the standby optical transmission line. The receiving terminal device includes an active photoelectric conversion unit that photoelectrically converts an optical signal from the active optical transmission line, a standby photoelectric conversion unit that photoelectrically converts an optical signal from the standby optical transmission line, and an input electrical The power processing unit that stores the power of the signal, the active signal processing unit that performs predetermined signal processing on the input electric signal, the standby signal processing unit, and the output destination of the electric signal from the active photoelectric conversion unit The working system switch that can be switched between the system signal processing unit and the power processing unit, and the output destination of the electrical signal from the standby system photoelectric conversion unit can be switched between the system signal processing unit and the power processing unit. A standby switch and a control unit that controls the active switch and the standby switch, and controls the active switch so that an electrical signal from the active photoelectric conversion unit is output to the active signal processing unit during normal operation. Along with the power from the standby photoelectric converter Control the standby switch to output the signal to the power processing unit, and control the active switch to output the electrical signal from the active photoelectric conversion unit to the power processing unit when a failure occurs in the active optical transmission line And a control unit that controls the standby system switch so as to output an electrical signal from the standby system photoelectric conversion unit to the standby system signal processing unit.

  Yet another embodiment of the present invention is a receiving terminal apparatus. This device is a receiving terminal device that receives optical signals from both a redundant working optical transmission line and a standby optical transmission line, and is an active system that photoelectrically converts an optical signal from the working optical transmission line A photoelectric conversion unit, a standby photoelectric conversion unit that photoelectrically converts an optical signal from the standby optical transmission line, a power processing unit that stores electric power of the input electric signal, and predetermined signal processing on the input electric signal An active system signal processing unit and a standby system signal processing unit, an active system switch capable of switching an output destination of an electrical signal from the active system photoelectric conversion unit between the active system signal processing unit and the power processing unit, A control unit that controls the output destination of the electrical signal from the system photoelectric conversion unit, the standby system switch that can be switched between the standby system signal processing unit and the power processing unit, and the active system switch and the standby system switch, During normal operation, electricity from the active photoelectric converter The active switch is controlled so that the signal is output to the active signal processing unit, and the standby switch is controlled so that the electrical signal from the standby photoelectric conversion unit is output to the power processing unit. When it occurs, the standby system switch controls the active system switch to output the electrical signal from the active system photoelectric conversion unit to the power processing unit and outputs the electrical signal from the standby system photoelectric conversion unit to the standby system signal processing unit. And a control unit for controlling.

  It should be noted that any combination of the above-described constituent elements and a representation of the present invention converted between an apparatus, a method, a system, a program, a recording medium storing the program, etc. are also effective as an aspect of the present invention.

  According to the present invention, it is possible to improve energy efficiency in an optical transmission system in which an optical signal line is made redundant by using an active transmission line and a standby optical transmission line.

It is a figure for demonstrating the optical transmission system which concerns on 1st Embodiment of this invention. It is a figure for demonstrating the optical transmission system which concerns on 2nd Embodiment of this invention.

  FIG. 1 is a diagram for explaining an optical transmission system according to a first embodiment of the present invention. An optical transmission system 10 shown in FIG. 1 constitutes an OUPSR optical ring network. The OUPSR system is advantageous in terms of cost because the apparatus configuration can be simplified compared to the UPSR system. In the optical transmission system 10, a plurality of terminal devices (first terminal device 11A, second terminal device 11B, third terminal device 11C, and fourth terminal device 11D) are connected by an optical transmission path (that is, an optical fiber). They are interconnected to form a ring-shaped optical communication network. Each of these terminal devices has a function of transmitting and receiving an optical signal, but here, for convenience of explanation, the first terminal device 11A is referred to as a “transmission terminal device” that transmits an optical signal, and the third terminal device 11C is It will be described as a “receiving terminal device” that receives an optical signal. The first terminal device 11A and the third terminal device 11C are redundantly connected by a working optical transmission line 20 and a standby optical transmission line 21. A single mode optical fiber can be used as the optical transmission line.

  The first terminal device 11A as a transmitting terminal device includes a transponder 13, an optical coupler 14, an active optical amplifier 15, and a standby optical amplifier 16.

  The transponder 13 converts the wideband client signal input from the client device 12A into a photoelectrically converted O / E converter 17 and an electrical signal from the O / E converter 17 into a frame, and adds a predetermined error correction code or the like. A main signal processing unit 18 that performs transmission processing and an E / O conversion unit 19 that converts an electrical signal from the main signal processing unit 18 into a narrowband optical signal are provided. The optical signal output from the E / O converter 19 is input to the optical coupler 14. As the E / O converter 19, for example, a laser diode can be used.

  The optical coupler 14 branches the input optical signal into two, outputs one branched optical signal to the working optical amplifier 15, and outputs the other branched optical signal to the standby optical amplifier 16. The working optical amplifier 15 amplifies the input optical signal to a predetermined optical level and outputs it to the working optical transmission line 20. The optical signal output from the working optical amplifier 15 (referred to as the “working optical signal”) is transmitted counterclockwise through the working optical transmission line 20 through the second terminal device 11B, and the third terminal station. The device 11C is reached. On the other hand, the standby optical amplifier 16 amplifies the input optical signal to a predetermined optical level and outputs it to the standby optical transmission line 21. The optical signal output from the standby optical amplifier 16 (referred to as “backup optical signal”) is transmitted clockwise through the standby optical transmission path 21 through the fourth terminal device 11D, and is also the third terminal station. The device 11C is reached.

  As described above, in the optical transmission system 10 according to the present embodiment, the first terminal device 11A includes the third terminal device by the optical transmission path redundantly configured by the working optical transmission path 20 and the standby optical transmission path 21. 11C. The first terminal apparatus 11A transmits an optical signal to both the working optical transmission line 20 and the standby optical transmission line 21. The third terminal device 11C receives optical signals from both the working optical transmission line 20 and the standby optical transmission line 21.

  The third terminal station device 11C as the receiving terminal device performs predetermined signal processing on the input optical signal, and then photoelectrically converts the input optical signal to the transponder 22 that is output to the client device 12C. A power processing unit 23, a 2-input × 2-output optical switch 24, a supervisory control unit 25, an active optical level detector 26, a standby optical level detector 27, an active optical amplifier 28, And a standby optical amplifier 29.

  The working optical signal that has passed through the working optical transmission line 20 is input to the working optical amplifier 28. The working optical amplifier 28 amplifies the working optical signal and outputs it to the working input unit of the optical switch 24. On the other hand, the standby optical signal that has passed through the standby optical transmission line 21 is input to the standby optical amplifier 29. The standby optical amplifier 29 amplifies the standby optical signal and outputs it to the standby input unit of the optical switch 24.

  The working system light level detection unit 26 and the standby system light level detection unit 27 are configured by light receiving elements such as photodiodes (PD), for example. The working optical level detector 26 detects the optical level of the working optical signal input to the working input unit of the optical switch 24. The standby optical level detector 27 detects the optical level of the standby optical signal input to the standby input unit of the optical switch 24. The light level information detected by the active system light level detection unit 26 and the standby system light level detection unit 27 is sent to the monitoring control unit 25.

  One of the two output units in the optical switch 24 is connected to the transponder 22, and the other is connected to the power processing unit 23. The optical switch 24 is configured to be able to switch the output destination of each of the working optical signal and the standby optical signal between the transponder 22 and the power processing unit 23.

  The supervisory control unit 25 controls the optical switch 24 based on the light level information from the working system light level detection unit 26 and the standby system light level detection unit 27. Control of the optical switch 24 by the monitoring controller 25 will be described later.

  The transponder 22 photoelectrically converts a narrowband optical signal input from the optical switch 24, and performs timing extraction, identification reproduction, error correction, etc. on the electrical signal from the O / E converter 30. A main signal processing unit 31 that performs predetermined reception processing, and an E / O conversion unit 32 that converts an electrical signal from the main signal processing unit 31 into a wideband client signal. The client signal output from the E / O conversion unit 19 is input to the client device 12C.

  The power processing unit 23 photoelectrically converts a narrowband optical signal input from the optical switch 24, a power charging unit 34 that charges the electric signal power from the O / E conversion unit 33, and A power supply unit 35 is provided for supplying the power stored in the power charging unit 34 to a predetermined device in the receiving terminal device. As the O / E converter 33, for example, a photodiode can be used. The power supply unit 35 is configured to be able to supply power to the transponder 22, for example. In this embodiment, an external power source is connected to each terminal device, and various devices in each terminal device can be operated by power from the external power source.

  Next, control of the optical switch 24 by the monitoring control unit 25 will be described. During normal operation, the supervisory control unit 25 controls the optical switch 24 so that the active optical signal is output to the transponder 22 and the standby optical signal is output to the power processing unit 23. The normal operation is, for example, a case where the optical level of the active optical signal detected by the active optical level detection unit 26 exceeds a predetermined threshold. By controlling the optical switch 24 in this way, the active optical signal is subjected to predetermined signal processing by the transponder 22 and then output to the client device 12C.

  On the other hand, the standby optical signal is converted into an electric signal by the O / E conversion unit 33 and then charged to the power charging unit 34. The power stored in the power charging unit 34 is supplied by the power supply unit 35 to a predetermined device in the third terminal device 11C. As a result, at least part of the power consumed by the device is covered by the power supply unit 35. The power stored in the power charging unit 34 is energy that has been discarded in the case of a conventional optical transmission system. According to the optical transmission system 10 according to the present embodiment, such energy that has been conventionally discarded can be used effectively, so that energy efficiency can be improved.

  When a failure occurs in the working optical transmission line 20, the supervisory control unit 25 sets the optical switch 24 so that the working optical signal is output to the power processing unit 23 and the standby optical signal is output to the transponder 22. Control. In the present embodiment, the supervisory control unit 25 detects a failure in the optical transmission line based on the light level information from the working optical level detection unit 26 and the standby optical level detection unit 27. Specifically, the supervisory control unit 25 determines that some failure has occurred in the working optical transmission line 20 when the optical level of the working optical signal drops below a predetermined threshold during normal operation. In this case, the supervisory control unit 25 controls the optical switch 24 so that the active optical signal is output to the power processing unit 23 and the standby optical signal is output to the transponder 22. Thus, after the standby optical signal is processed by the transponder 22, it can be sent to the client device 12C and the main signal transmission can be continued, so that the reliability of the network constituted by the optical transmission system 10 can be improved. The switching of the optical switch 24 is preferably performed within a predetermined switching time (for example, 50 ms).

  On the other hand, the working optical signal input to the power processing unit 23 is converted into an electrical signal by the O / E conversion unit 33 and then charged to the power charging unit 34. However, for example, when a disconnection occurs in the working optical transmission line 20, there is no working optical signal input to the power processing unit 23, and no power is newly charged in the power charging unit 34. In this case, after the power charged in the power charging unit 34 during normal operation is lost, each device of the third terminal device 11C operates only with power from the external power source. Further, for example, when the optical level of the working optical signal is equal to or lower than a predetermined threshold value but has not yet disappeared, the power charging unit 34 is charged with the power of the working optical signal, and the power supply unit 35 It is supplied to a predetermined device in the three terminal equipment 11C.

  As described above, according to the optical transmission system 10 according to the present embodiment, the reliability of the network can be improved by making the optical signal line redundant, and the optical signal that is not used for main signal transmission. Energy efficiency can be improved by charging the power of the standby system optical signal during normal operation.

  In the first embodiment shown in FIG. 1, the case where each terminal device includes one transponder has been described for convenience of explanation. However, in the WDM optical transmission system, each terminal device has an optical signal having a different wavelength. It should be understood that a plurality of transponders capable of transmitting and receiving and an optical multiplexer / demultiplexer for multiplexing / demultiplexing optical signals of a plurality of wavelengths may be provided.

  FIG. 2 is a diagram for explaining an optical transmission system according to the second embodiment of the present invention. The optical transmission system 40 shown in FIG. 2 constitutes a UPSR optical ring network. The UPSR system is more expensive than the OUPSR system and thus costs higher, but higher reliability than the OUPSR system can be ensured. In the optical transmission system 40, a plurality of terminal devices (first terminal device 41A, second terminal device 41B, third terminal device 41C, and fourth terminal device 41D) are connected by an optical transmission line (that is, an optical fiber). They are interconnected to form a ring-shaped optical communication network. Each of these terminal devices has a function of transmitting and receiving an optical signal, but here, for convenience of explanation, the first terminal device 41A is referred to as a “transmission terminal device” that transmits an optical signal, and the third terminal device 41C is It will be described as a “receiving terminal device” that receives an optical signal. The first terminal device 41A and the third terminal device 41C are redundantly connected by a working optical transmission line 54 and a standby optical transmission line 55. A single mode optical fiber can be used as the optical transmission line.

  The first terminal device 41A as a transmitting terminal device includes a working transponder 43, a standby transponder 44, an optical coupler 47, a working optical amplifier 45, and a standby optical amplifier 46.

  In the present embodiment, a client signal from the client device 42 </ b> A is input to the optical coupler 47. The optical coupler 47 branches the input optical signal into two, outputs one branched optical signal to the working transponder 43, and outputs the other branched optical signal to the standby transponder 44.

  The active transponder 43 frames the electrical signal from the active O / E converter 48 that photoelectrically converts the wideband client signal and the active O / E converter 48, and performs predetermined transmission such as adding an error correction code. An active main signal processing unit 49 that performs processing, and an active E / O conversion unit 50 that converts an electrical signal from the active main signal processing unit 49 into a narrowband optical signal. The optical signal output from the working E / O converter 50 is input to the working optical amplifier 45. As the active E / O converter 50, for example, a laser diode can be used. The optical signal amplified by the working optical amplifier 45 (referred to as the “working system optical signal”) is transmitted counterclockwise through the working terminal optical transmission path 54 through the second terminal device 41B, and the third terminal. The station apparatus 41C is reached.

  The standby transponder 44 has the same configuration as the active transponder 43. That is, the standby transponder 44 frames the electrical signal from the standby O / E converter 51 that photoelectrically converts the wideband client signal and the standby O / E converter 51, and adds a predetermined error correction code or the like. And a standby E / O converter 53 that converts an electrical signal from the standby main signal processor 52 into a narrowband optical signal. The optical signal output from the standby E / O converter 53 is input to the standby optical amplifier 46. As the standby E / O converter 53, for example, a laser diode can be used. The optical signal amplified by the standby optical amplifier 46 (referred to as “backup optical signal”) is transmitted clockwise through the standby optical transmission line 55 through the fourth terminal device 41D, and the third terminal station. The device 41C is reached.

  In the present embodiment, the working optical signal output from the working transponder 43 and the standby optical signal output from the standby transponder 44 have the same wavelength.

  As described above, in the optical transmission system 40 according to the present embodiment, the first terminal device 41A includes the third terminal device by the optical transmission path redundantly configured by the working optical transmission path 54 and the standby optical transmission path 55. 41C is connected. The first terminal device 41A transmits an optical signal to both the working optical transmission line 54 and the standby optical transmission line 55. The third terminal device 41C receives optical signals from both the working optical transmission line 54 and the standby optical transmission line 55.

  The third terminal station device 41C as the receiving terminal device performs predetermined signal processing on the input optical signal, and then outputs to the client device 42C, the active transponder 56 and the standby transponder 57, and the monitoring control unit 58. A power charging unit 59, a power supply unit 60, an active optical amplifier 61, and a standby optical amplifier 62.

  The working optical signal that has passed through the working optical transmission line 54 is input to the working optical amplifier 61. The working optical amplifier 61 amplifies the working optical signal and outputs it to the working transponder 56. On the other hand, the standby optical signal that has passed through the standby optical transmission line 55 is input to the standby optical amplifier 62. The standby optical amplifier 62 amplifies the standby optical signal and outputs it to the standby transponder 57.

  The working transponder 56 photoelectrically converts the input narrowband working optical signal, and the electrical signal from the working O / E converting unit 63 (referred to as “working electrical signal”). ) Output destination can be switched between the active main signal processing unit 65 and the power charging unit 59, and timing extraction, identification reproduction, error correction, etc. are performed on the input active electric signal. The active main signal processing unit 65 for performing the predetermined reception processing and the active E / O conversion unit 66 for converting the input active electric signal into a wideband client signal. In the present embodiment, the active switch 64 is a 1-input × 2-output switch that can switch the output destination of the input active electrical signal. The client signal output from the active E / O conversion unit 66 is input to the optical coupler 71.

  The standby transponder 57 has the same configuration as the active transponder 56. The spare transponder 57 photoelectrically converts the input narrowband spare optical signal, and an electrical signal from the spare O / E converter 67 (referred to as “spare electrical signal”). ) Output destination can be switched between the standby main signal processing unit 69 and the power charging unit 59, timing extraction, identification reproduction, error correction, etc. for the input standby system electric signal A standby main signal processing unit 69 that performs the predetermined reception processing, and a standby E / O conversion unit 70 that converts the input backup electrical signal into a wideband client signal. In the present embodiment, the standby system switch 68 is a 1-input × 2-output switch that can switch the output destination of the input standby system electrical signal. The client signal output from the standby E / O conversion unit 70 is input to the optical coupler 71.

  The optical coupler 71 is connected to the working E / O conversion unit 66 and the standby E / O conversion unit 70. The optical coupler 71 outputs the optical signal input from the working transponder 56 and the standby transponder 57 to the client device 42C.

  The monitoring control unit 58 controls each component of the working transponder 56 and the standby transponder 57. The control by the monitoring control unit 58 will be described later.

  The power charging unit 59 charges the electric signal power from the active system switch 64 and the standby system switch 68. The power supply unit 60 supplies the power stored in the power charging unit 59 to a predetermined device in the receiving terminal device. The power supply unit 60 is configured to be able to supply power to the active transponder 56 and the standby transponder 57, for example. In this embodiment, an external power source is connected to each terminal device, and various devices in each terminal device can be operated by power from the external power source.

  Next, the control of the active transponder 56 and the standby transponder 57 by the monitoring control unit 58 will be described. During normal operation, the monitoring controller 58 controls the active switch 64 so that the active electrical signal is output to the active main signal processing unit 65 and the standby electrical signal is output to the power charging unit 59. The standby system switch 68 is controlled. The normal operation is, for example, a case where the optical level of the working optical signal input to the working O / E conversion unit 63 exceeds a predetermined threshold. By controlling the working system switch 64 in this manner, the working system electrical signal is subjected to predetermined signal processing by the working system main signal processing unit 65 and then converted into a client signal by the working system E / O conversion unit 66. It is converted and output to the optical coupler 71. Further, by controlling the standby system switch 68 in this way, the standby system electrical signal is charged in the power charging unit 59. The power stored in the power charging unit 59 is supplied by the power supply unit 60 to a predetermined device in the third terminal device 41C. As a result, at least part of the power consumed by the device is covered by the power supply unit 60. The power stored in the power charging unit 59 is energy that has been discarded in the case of a conventional optical transmission system. According to the optical transmission system 40 according to the present embodiment, such energy that has been conventionally discarded can be used effectively, so that energy efficiency can be improved.

  During normal operation, the monitoring controller 58 turns off the standby E / O converter 70 from light output. Thus, only the client signal from the active E / O conversion unit 66 is input from the optical coupler 71 to the client device 42C.

  When a failure occurs in the working optical transmission line 54, the supervisory control unit 58 controls the working switch 64 so that the working electrical signal is output to the power charging unit 59, and the standby electrical signal is sent to the standby system main signal. The standby switch 68 is controlled so as to be output to the signal processing unit 69. For example, the monitoring control unit 58 determines that a failure has occurred in the working optical transmission line 54 when the optical level of the working optical signal input to the working O / E conversion unit 63 falls below a predetermined threshold. judge.

  The backup electrical signal input to the backup main signal processing unit 69 is subjected to predetermined signal processing, converted into a client signal by the backup E / O conversion unit 70, and output to the optical coupler 71. In the present embodiment, when a failure occurs in the working optical transmission line 54, the monitoring controller 58 turns off the working E / O converter 66. Accordingly, only the client signal from the standby E / O conversion unit 70 is input from the optical coupler 71 to the client device 42C. As described above, according to the present embodiment, since the main signal transmission can be continued even when a failure occurs in the working optical transmission line 54, the reliability of the network constituted by the optical transmission system 40 can be improved. The active switch 64 and the standby switch 68 are preferably switched within a predetermined switching time (for example, 50 ms).

  On the other hand, the working electrical signal input from the working switch 64 to the power charging unit 59 is charged in the power charging unit 59. However, for example, when a disconnection occurs in the working optical transmission line 54, the working electrical signal input to the power charging unit 59 disappears, and no power is newly charged in the power charging unit 59. In this case, after the power charged in the power charging unit 59 during normal operation disappears, each device of the third terminal device 41C operates only with power from the external power source. Further, for example, when the optical level of the working optical signal has become equal to or lower than a predetermined threshold value but has not yet disappeared, the power charging unit 59 is charged with the power of the working electrical signal, and the power supply unit 60 It is supplied to a predetermined device in the three terminal equipment 41C.

  As described above, according to the optical transmission system 40 according to the present embodiment, the reliability of the network can be improved by providing the redundant configuration of the optical signal line, and the optical signal that is not used for the main signal transmission. Energy efficiency can be improved by charging the power of the standby system optical signal during normal operation.

  In the second embodiment shown in FIG. 2, for convenience of explanation, a case has been described in which each terminal device includes a pair of transponders that transmit and receive optical signals of the same wavelength. However, in the WDM optical transmission system, each terminal It should be understood that the station apparatus may include a plurality of sets of transponders that can transmit and receive optical signals having different wavelengths, and an optical multiplexer / demultiplexer that multiplexes / demultiplexes optical signals having a plurality of wavelengths.

  The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to combinations of the respective constituent elements and processing processes, and such modifications are also within the scope of the present invention. is there.

  10, 40 optical transmission system, 13 transponder, 14, 47, 71 optical coupler, 20, 54 active optical transmission line, 21, 55 standby optical transmission line, 22 transponder, 23 power processing unit, 24 optical switch, 25, 58 supervisory control unit, 34, 59 power charging unit, 35, 60 power supply unit, 43, 56 active transponder, 44, 57 standby transponder, 64 active switch, 68 standby switch.

Claims (18)

An optical transmission line configured redundantly by an active optical transmission line and a standby optical transmission line;
A transmitting terminal device that transmits an optical signal to both the working optical transmission line and the standby optical transmission line;
A receiving terminal device that receives optical signals from both the working optical transmission line and the standby optical transmission line;
An optical transmission system comprising:
The receiving terminal device is
An optical signal processing unit that performs predetermined signal processing on the input optical signal;
A power processing unit that photoelectrically converts an input optical signal and stores power; and
An optical switch for switching the output destination of each optical signal from the active optical transmission line and the standby optical transmission line between the optical signal processing unit and the power processing unit;
A control unit that controls the optical switch, and outputs an optical signal from the active optical transmission line to the optical signal processing unit and performs power processing on the optical signal from the standby optical transmission line during normal operation; The optical switch is controlled so as to output to the optical system, and when a failure occurs in the active optical transmission line, an optical signal from the active optical transmission line is output to the power processing unit and the standby optical transmission A control unit that controls the optical switch to output an optical signal from a path to the optical signal processing unit;
An optical transmission system comprising:   The optical transmission system according to claim 1, wherein the power processing unit is configured to supply the stored power to a predetermined device in the receiving terminal device. The receiving terminal device further includes an optical level detector that detects an optical level of each optical signal from the active optical transmission line and the standby optical transmission line,
The control unit outputs an optical signal from the working optical transmission line to the power processing unit when the optical level of the optical signal from the working optical transmission line decreases below a predetermined threshold during normal operation. The optical transmission system according to claim 1, wherein the optical switch is controlled to output an optical signal from the standby optical transmission path to the optical signal processing unit.   4. The optical transmission system according to claim 1, wherein the optical switch is a 2-input × 2-output optical switch.   The transmitting terminal device branches an optical signal from the optical transmitter that outputs an optical signal and an optical signal from the optical transmitter, and outputs one branched optical signal to the working optical transmission line. 5. The optical transmission system according to claim 1, further comprising: an optical branching unit that outputs a branched optical signal to the standby optical transmission line. A receiving terminal device that receives optical signals from both a redundant active optical transmission line and a standby optical transmission line,
An optical signal processing unit that performs predetermined signal processing on the optical signal;
A power processing unit that photoelectrically converts an input optical signal and stores power; and
An optical switch capable of switching the output destination of each optical signal from the working optical transmission line and the standby optical transmission line between the optical signal processing unit and the power processing unit,
A control unit that controls the optical switch, and outputs an optical signal from the active optical transmission line to the optical signal processing unit and performs power processing on the optical signal from the standby optical transmission line during normal operation; The optical switch is controlled so as to output to the optical system, and when a failure occurs in the active optical transmission line, an optical signal from the active optical transmission line is output to the power processing unit and the standby optical transmission A control unit that controls the optical switch to output an optical signal from a path to the optical signal processing unit;
A receiving terminal device comprising:   The receiving terminal device according to claim 6, wherein the power processing unit is configured to supply the stored power to a predetermined device in the receiving terminal device. An optical level detector that detects an optical level of each optical signal from the active optical transmission line and the standby optical transmission line;
The control unit outputs an optical signal from the working optical transmission line to the power processing unit when the optical level of the optical signal from the working optical transmission line decreases below a predetermined threshold during normal operation. The receiving terminal apparatus according to claim 6 or 7, wherein the optical switch is controlled to output an optical signal from the standby optical transmission line to the optical signal processing unit.   9. The receiving terminal apparatus according to claim 6, wherein the optical switch is a 2-input × 2-output optical switch. An optical transmission line configured redundantly by an active optical transmission line and a standby optical transmission line;
A transmitting terminal device that transmits an optical signal to both the working optical transmission line and the standby optical transmission line;
A receiving terminal device that receives optical signals from both the working optical transmission line and the standby optical transmission line;
An optical transmission system comprising:
The receiving terminal device is
An active photoelectric conversion unit that photoelectrically converts an optical signal from the active optical transmission line;
A backup photoelectric conversion unit that photoelectrically converts an optical signal from the backup optical transmission line;
An electric power processing unit for storing electric power of the input electric signal;
An active signal processing unit and a standby signal processing unit that perform predetermined signal processing on the input electrical signal;
An active switch that can change the output destination of the electrical signal from the active photoelectric conversion unit between the active signal processing unit and the power processing unit;
A standby switch that can change the output destination of the electrical signal from the standby photoelectric conversion unit between the standby signal processing unit and the power processing unit,
A control unit that controls the active switch and the standby switch, and controls the active switch so that an electrical signal from the active photoelectric conversion unit is output to the active signal processing unit during normal operation. In addition, the standby switch is controlled to output an electrical signal from the standby photoelectric conversion unit to the power processing unit, and when a failure occurs in the active optical transmission line, the electrical signal from the active photoelectric conversion unit is A control unit for controlling the standby system switch so as to output the electrical signal from the standby system photoelectric conversion unit to the standby system signal processing unit while controlling the active system switch so as to output a signal to the power processing unit;
An optical transmission system comprising:   The optical transmission system according to claim 10, wherein the power processing unit is configured to supply the stored power to a predetermined device in the receiving terminal device.   The receiving terminal apparatus includes an active optical converter that converts an electrical signal from the active signal processor into an optical signal, and a standby optical converter that converts the electrical signal from the standby signal processor into an optical signal. The optical transmission system according to claim 10, further comprising: an optical coupler connected to the active optical conversion unit and the standby optical conversion unit. The control unit is configured to be able to control light output interruption of the active system light conversion unit and the standby system light conversion unit,
The control unit is configured to turn off the standby optical conversion unit during normal operation, and to cut off the optical output of the active optical conversion unit when a failure occurs in the working optical transmission line. The optical transmission system according to claim 12.   The transmission terminal apparatus comprises: an active optical transmitter that outputs an optical signal to the active optical transmission line; and a standby optical transmitter that outputs an optical signal to the standby optical transmission line. The optical transmission system according to claim 10. A receiving terminal device that receives optical signals from both a redundant active optical transmission line and a standby optical transmission line,
An active photoelectric conversion unit that photoelectrically converts an optical signal from the active optical transmission line;
A backup photoelectric conversion unit that photoelectrically converts an optical signal from the backup optical transmission line;
An electric power processing unit for storing electric power of the input electric signal;
An active signal processing unit and a standby signal processing unit that perform predetermined signal processing on the input electrical signal;
An active switch that can change the output destination of the electrical signal from the active photoelectric conversion unit between the active signal processing unit and the power processing unit;
A standby switch that can change the output destination of the electrical signal from the standby photoelectric conversion unit between the standby signal processing unit and the power processing unit,
A control unit that controls the active switch and the standby switch, and controls the active switch so that an electrical signal from the active photoelectric conversion unit is output to the active signal processing unit during normal operation. In addition, the standby switch is controlled to output an electrical signal from the standby photoelectric conversion unit to the power processing unit, and when a failure occurs in the active optical transmission line, the electrical signal from the active photoelectric conversion unit is A control unit for controlling the standby system switch so as to output the electrical signal from the standby system photoelectric conversion unit to the standby system signal processing unit while controlling the active system switch so as to output a signal to the power processing unit;
A receiving terminal device comprising:   The receiving terminal device according to claim 15, wherein the power processing unit is configured to supply the stored power to a predetermined device in the receiving terminal device.   An active optical converter that converts an electrical signal from the active signal processor into an optical signal; a standby optical converter that converts an electrical signal from the standby signal processor into an optical signal; and the active light The receiving terminal apparatus according to claim 15 or 16, further comprising: an optical coupler connected to the converter and the standby optical converter. The control unit is configured to be able to control light output interruption of the active system light conversion unit and the standby system light conversion unit,
The control unit is configured to turn off the standby optical conversion unit during normal operation, and to cut off the optical output of the active optical conversion unit when a failure occurs in the working optical transmission line. The receiving terminal device according to claim 17.

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