WO2023089663A1 - 光通信システム、制御装置及び光通信方法 - Google Patents
光通信システム、制御装置及び光通信方法 Download PDFInfo
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- WO2023089663A1 WO2023089663A1 PCT/JP2021/042087 JP2021042087W WO2023089663A1 WO 2023089663 A1 WO2023089663 A1 WO 2023089663A1 JP 2021042087 W JP2021042087 W JP 2021042087W WO 2023089663 A1 WO2023089663 A1 WO 2023089663A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0852—Delays
- H04L43/0864—Round trip delays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0005—Switch and router aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/12—Discovery or management of network topologies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0005—Switch and router aspects
- H04Q2011/0037—Operation
- H04Q2011/0039—Electrical control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
- H04Q2011/0083—Testing; Monitoring
Definitions
- the present invention relates to an optical communication system, a control device, and an optical communication method.
- PtP Point to Point
- WDM Widelength Division Multiplexing
- PON Passive Optical Network
- the upstream direction is the direction from the ONU to the OLT.
- the downstream direction is the direction from the OLT to the ONUs.
- a management control signal called AMCC is used as a signal for management and control between the OLT and ONU.
- the AMCC signal is a signal that is superimposed on a main signal and transmitted after information to be transmitted is modulated in a predetermined manner.
- the OLT and ONU can transmit the signal for management and control within the wavelength range of the optical wavelength used for the main signal. That is, management and control are realized without using a dedicated optical wavelength band for management and control.
- a wavelength determination process in which upstream and downstream optical wavelengths are determined is performed using the AMCC signal.
- FIG. 10 is a diagram showing a configuration example of a PtP WDM-PON system.
- the figure shows a configuration relating to superimposition of the AMCC signal.
- the OLT and ONUs contain management controls.
- the AMCC signals are superimposed in the optical stage and separated in the electrical stage.
- FIG. 11 shows an example of an optical signal transmitted from an ONU or OLT.
- the transmitted optical signal is the main signal on which the management control signal is superimposed.
- intensity modulation is added to the envelope of the main signal as shown in FIG.
- the main signal is a high-speed signal with a data rate on the order of Gb/s (gigabits per second).
- management control signals are expected to be low-speed signals with data rates on the order of kb/s (kilobits per second) (eg, Non-Patent Document 2).
- the All-Photonics Network is an innovative network based on photonics technology.
- optical nodes relay optical backbone networks and optical access networks to provide end-to-end optical paths for each service.
- the optical node is assumed to be an optical SW (Switch) or the like.
- FIG. 12 is a diagram showing the configuration of an optical communication system in APN (see, for example, Non-Patent Document 3).
- the optical communication system shown in FIG. 12 has a user equipment 92 , an optical GW (gateway) 93 and an APN controller 96 .
- the two optical GWs 93 are described as optical GWs 93-1 and 93-2.
- User equipment 92 comprises an optical transceiver (TRx).
- the optical GW 93-n has an optical SW 94-n and a wavelength multiplexer/demultiplexer 95-n.
- the optical GW 93-1 and the optical GW 93-2 are connected by an optical transmission line 97 via a wavelength multiplexing/demultiplexing unit 95-1 and a wavelength multiplexing/demultiplexing unit 95-2.
- the light SW 94 - n outputs light input from the first port 941 from the second port 942 and outputs light input from the second port 942 from the first port 941 .
- the second port 942 of the optical SW 94-n is connected to the wavelength multiplexer/demultiplexer 95-n, but may be connected to another second port 942.
- an AWG Arrayed Waveguide Grating
- the wavelength multiplexing/demultiplexing unit 95-n multiplexes optical signals of a plurality of wavelengths input from each second port 942 of the optical SW 94-n and outputs the multiplexed signal to the optical transmission line 97.
- the wavelength multiplexing/demultiplexing unit 95-n receives an optical signal from the optical transmission line 97, demultiplexes the input optical signal, and outputs the demultiplexed signal to the optical SW 94-n.
- the APN controller 96 determines the transmission/reception wavelength of each user device 92 and the port connection relationship between the first port 941 and the second port 942 of each of the optical SWs 94-1 and 94-2. In accordance with these decisions, the APN controller 96 instructs the user equipment 92 on transmission/reception wavelengths, and instructs the optical SW 94-1 and optical SW 94-2 on port connection relationships.
- user devices 92-1-1 and 92-1-2 communicate
- user devices 92-1-3 and 92-2-3 communicate. Different wavelengths are used for these communications.
- the management control information is superimposed on the main signal by superimposing the AMCC signal, which is slower than the main signal. Therefore, in order for the APN controller to acquire the management control information from the user equipment, it is assumed that the AMCC signal is extracted in the middle of the transmission path between the user equipment. However, in many cases, the transmission distance from each user equipment to the optical GW is different. Therefore, if light is extracted from the transmission paths of different user devices at the same branching ratio, the APN controller may branch extra light that is greater than the minimum light receiving sensitivity for receiving the AMCC signal. If extra light is dropped, the light energy used to transmit the main signal to the end user becomes inefficient. Therefore, there is a possibility that the transmission distance of the main signal cannot be maximized. By minimizing the power of the branched light within the range where the APN controller can receive the AMCC signal, it is expected that the transmission distance of the main signal will be made longer.
- the transmission distance from the user equipment 92-1-1 to the optical GW 93-1 is longer than the transmission distance from the user equipment 92-1-3 to the optical GW 93-1.
- a splitter 98 is provided in the optical transmission line between the optical SW 94-1 and the wavelength multiplexing/demultiplexing section 95-1.
- the splitter 98 that splits the optical signal transmitted by the user device 92-1-1 uses a splitting ratio that allows the APN controller 96 to receive the optical signal from the user device 92-1-1. This splitting ratio is also applied to the splitter 98 that splits the optical signal transmitted by the user equipment 92-1-3. As a result, excess light is extracted from the optical signal transmitted by the user equipment 92-1-3, which may result in inefficiency in energy efficiency.
- the present invention provides an optical communication system, a control device, and an optical communication method capable of branching an optical signal having power necessary for light reception while minimizing reduction in the power of the optical signal transmitted through the transmission path. is intended to provide
- An optical communication system has a plurality of ports, and transmits an optical signal input from a first port, which is the port connected to an optical communication device, to another port according to the transmission path of the optical signal.
- an optical switch for outputting from a second port which is said port; an optical branching unit for branching said optical signal output from said second port according to a branching ratio; and said optical communication device and said optical signal via said optical switch a measurement unit that measures a round trip time by transmitting and receiving, and calculates a transmission distance of an optical signal based on the measured round trip time; and an instruction unit for instructing the unit.
- An optical communication system has a plurality of ports, and transmits an optical signal input from a first port, which is the port connected to an optical communication device, to another port according to the transmission path of the optical signal.
- an optical switch for outputting from a second port which is the port, an optical branching unit for branching the optical signal output from the second port according to a branching ratio, and a measuring unit for measuring the optical intensity of the branched optical signal and an instruction unit that instructs the optical branching unit to change the branching ratio so that the measured optical intensity approaches a predetermined optical intensity.
- a control device has a plurality of ports, and transmits an optical signal input from a first port, which is the port connected to the optical communication device, to the other ports according to the transmission path of the optical signal.
- a round-trip time is measured by transmitting and receiving an optical signal to and from the optical communication device via an optical switch outputting from a second port, which is a port, and the transmission distance of the optical signal is calculated based on the measured round-trip time.
- an instruction unit that instructs an optical branching unit that branches the optical signal output from the second port according to the branching ratio, the branching ratio determined based on the calculated transmission distance.
- a control device has a plurality of ports, and transmits an optical signal input from a first port, which is the port connected to the optical communication device, to the other ports according to the transmission path of the optical signal.
- a measuring unit for measuring the optical intensity of the optical signal branched in an optical branching unit for branching the optical signal output from the second port according to the branching ratio of the optical switch outputting from the second port, which is a port; an instruction unit that instructs the optical branching unit to change the branching ratio so that the light intensity approaches a predetermined light intensity.
- an optical switch having a plurality of ports transmits an optical signal input from a first port, which is the port connected to an optical communication device, according to a transmission path of the optical signal.
- a switching step of outputting from a second port which is the other port a branching step of an optical branching unit branching the optical signal output from the second port according to a branching ratio;
- an optical switch having a plurality of ports converts an optical signal input from a first port, which is the port connected to an optical communication device, to a transmission path of the optical signal.
- the method includes a measuring step of measuring the optical intensity of the optical signal, and an instructing step of instructing the optical branching unit to change the branching ratio so that the measured optical intensity approaches a predetermined optical intensity.
- An optical communication method has a plurality of ports, and transmits an optical signal input from a first port, which is the port connected to an optical communication device, to another port according to the transmission path of the optical signal.
- a round-trip time is measured by transmitting/receiving an optical signal to/from the optical communication device via an optical switch outputting from the second port, which is the port, and the transmission distance of the optical signal is calculated based on the measured round-trip time. and an instruction step of instructing an optical branching unit that branches the optical signal output from the second port according to the branching ratio, the branching ratio determined based on the calculated transmission distance.
- An optical communication method has a plurality of ports, and transmits an optical signal input from a first port, which is the port connected to an optical communication device, to another port according to the transmission path of the optical signal.
- FIG. 1 is a diagram showing the configuration of an optical communication system according to a first embodiment of the present invention
- FIG. FIG. 4 is a diagram showing the configuration of a variable branching ratio coupler used as an optical branching switch according to the same embodiment
- It is a figure which shows the structure of PLC (Planar Lightwave Circuit) used as an optical branch switch by the same embodiment.
- FIG. 10 is a diagram showing the configuration of an optical communication system according to a second embodiment
- FIG. FIG. 13 is a diagram showing the configuration of an optical communication system according to a third embodiment
- FIG. FIG. 12 is a diagram showing the configuration of an optical communication system according to a fourth embodiment
- FIG. FIG. 12 is a diagram showing the configuration of an optical communication system according to a fifth embodiment;
- FIG. 12 is a diagram showing the configuration of an optical communication system according to a sixth embodiment
- FIG. FIG. 4 is a diagram showing the hardware configuration of a control device according to the first to sixth embodiments
- FIG. 1 is a diagram showing the configuration of a conventional PtP WDM-PON system
- 1 is a diagram showing a prior art optical signal
- FIG. 1 is a diagram showing the configuration of a conventional optical communication system
- This embodiment is applicable, for example, to an optical communication system that superimposes a management control signal of an AMCC signal on a high-speed main signal for transmission.
- Such an optical communication system has a splitter for branching an optical signal on an optical transmission line for transmitting the optical signal between user devices in order to extract the AMCC signal.
- the optical communication system of this embodiment makes the splitting ratio of the optical signal in the splitter variable according to the transmission distance between the user equipment and the optical GW. That is, the controller of the optical communication system sets the branching ratio of the splitter so that the AMCC signal can be received at the minimum light receiving sensitivity. As a result, the deterioration of the power of the optical signal is suppressed as much as possible, and the transmission distance of the main signal is maximized.
- FIG. 1 is a diagram showing the configuration of an optical communication system 1 according to the first embodiment.
- the optical communication system 1 has a user device 2 , an optical GW 3 and a control device 7 .
- the number of user equipments 2 included in the optical communication system 1 is arbitrary. In FIG. 1, two user devices 2 are described as user devices 2-1 and 2-2.
- the optical GW 3 is connected to an optical network (not shown) via an optical transmission line P10.
- an optical network is connected to a device with which the user device 2 communicates, or an optical network is connected to a network that accommodates a device with which the user device 2 communicates.
- the direction from the user equipment 2 to the optical GW 3 is described as up, and the direction from the optical GW 3 to the user equipment 2 is described as down.
- the user equipment 2 transmits and receives optical signals.
- the user device 2 can be a conventional user device.
- the user device 2 shown in FIG. 1 is a two-core optical transmission/reception device.
- the user device 2 is connected to the optical GW 3 via the optical transmission line P1 and the optical transmission line P2.
- the optical transmission line P1 and the optical transmission line P2 are, for example, two optical fibers in one two-core optical fiber cable.
- the user equipment 2 has an optical transceiver (TRx) 21 .
- the optical transmitter/receiver 21 is a wavelength tunable optical transmitter/receiver.
- the optical transmitter/receiver 21 is an optical transceiver that mutually converts an optical signal and an electrical signal.
- the user device 2 can select a wavelength according to the transmission/reception destination and set it in the optical transmission/reception unit 21 .
- the user equipment 2 sets the wavelengths to be used for the upstream optical signal and the downstream optical signal in the optical transmitter/receiver 21 according to the instruction received from the control device 7 .
- the optical transmitter/receiver 21 transmits/receives an optical signal in which a management control signal of an AMCC signal is superimposed on a main signal.
- the optical transmission/reception unit 21 converts a transmission signal in which a main signal of an electric signal and a management control signal of an electric signal having a frequency lower than that of the main signal are superimposed into an optical signal, and transmits the upstream optical signal. It generates and outputs the generated upstream optical signal to the optical transmission line P1.
- the optical transmitter/receiver 21 also receives a downstream optical signal from the optical transmission line P2 and converts the received downstream optical signal into an electrical signal.
- the optical transmitter/receiver 21 separates the main signal and the management control signal of the AMCC signal from the signal converted into the electrical signal.
- the user device 2 may be a single-core optical transmission/reception device.
- the optical transmitter/receiver 21 is connected to the optical GW 3 through a single optical transmission line.
- the optical GW 3 has a demultiplexer 31 , a demultiplexer 32 , an optical SW 4 , an optical splitter 5 , and a wavelength multiplexer/demultiplexer 6 .
- the optical GW 3 has one or more demultiplexers 31 , optical branchers 5 and wavelength multiplexers/demultiplexers 6 .
- the separation unit 31 and the separation unit 32 separate upstream optical signals and downstream optical signals.
- the separation unit 31 and the separation unit 32 can be realized by, for example, a circulator or an upper/lower separation filter.
- the separating unit 31 is connected to the user device 2 by the optical transmission lines P1 and P2, and is connected to the optical SW4 and the optical transmission line P3.
- the separating unit 31 outputs the upstream optical signal input from the optical transmission line P1 to the optical transmission line P3, and outputs the downstream optical signal input from the optical transmission line P3 to the optical transmission line P2.
- the separation unit 32 is connected to the optical SW4 and the optical transmission line P4, and is connected to the optical transmission/reception unit (TRx) 71 of the control device 7 by the optical transmission lines P5 and P6.
- the separating unit 32 outputs the upstream optical signal input from the optical transmission line P4 to the optical transmission line P5, and outputs the downstream optical signal input from the optical transmission line P6 to the optical transmission line P4.
- the optical SW 4 has a plurality of first ports 41 and a plurality of second ports 42 .
- the optical SW 4 outputs an optical signal of a predetermined wavelength input from the first port 41 to the second port 42 according to the transmission route to the destination of the optical signal.
- the optical SW 4 outputs an optical signal of a predetermined wavelength input from the second port 42 to the first port 41 according to the transmission route to the destination of the optical signal.
- the optical SW 4 can change the connection between the first port 41 and the second port 42 .
- a connection relationship between the first port 41 and the second port 42 is described as a port connection relationship.
- the optical SW 4 changes the port connection relationship according to instructions from the control device 7 .
- One or more first ports 41 are connected to the user device 2 via the optical transmission lines P1, P2 and P3 and the separation unit 31.
- FIG. The one or more second ports 42 are connected to the optical transmission/reception unit 71 of the control device 7 via the optical transmission lines P4, P5 and P6 and the separation unit 32, and the other one or more second ports 42 are used for optical transmission. It is connected to the wavelength multiplexing/demultiplexing unit 6 via the path P4.
- the second port 42 connected to the optical transmission/reception unit 71 of the control device 7 is referred to as the setting second port 42 .
- the optical branching unit 5 is provided on the optical transmission line P4 between the optical SW4 and the wavelength multiplexing/demultiplexing unit 6 . There may be an optical transmission line P4 in which the optical branching unit 5 is not provided.
- the optical splitter 5 has a splitter 51 , an optical splitter switch 52 , and a splitter 53 .
- the separation section 51 and the separation section 53 are connected by an optical transmission line P7 and an optical transmission line P8.
- the optical branch switch 52 is provided on the optical transmission line P7.
- the separation unit 51 separates the upstream optical signal and the downstream optical signal.
- the separation unit 51 can be realized by, for example, a circulator or an upper/lower separation filter.
- the separation unit 51 receives the upstream optical signal output from the second port 42 of the optical SW4 through the optical transmission line P4, and outputs the received upstream optical signal to the optical transmission line P7.
- the demultiplexer 51 also receives the downstream optical signal output from the demultiplexer 53 via the optical transmission line P8, and outputs the input downstream optical signal to the optical transmission line P4.
- the optical branch switch 52 branches the upstream optical signal transmitted through the optical transmission line P7 according to the set branch ratio.
- the branching ratio is instructed by the controller 7 .
- Any optical branching device can be used for the optical branching switch 52 as long as the optical branching ratio can be varied.
- the optical branch switch 52 may be an evanescent coupling type optical coupler, a melt-stretching type coupler whose length can be changed in the longitudinal direction, a planar lightwave circuit (PLC), or the like.
- PLC planar lightwave circuit
- the optical branch switch 52 outputs the branched optical signal to the control device 7 via the optical transmission line P9.
- the upstream optical signal that is not branched by the optical branch switch 52 is transmitted through the optical transmission line P7 and input to the separation unit 53 .
- the separation unit 53 separates the upstream optical signal and the downstream optical signal.
- the separation unit 53 can be implemented by a circulator, an upper/lower separation filter, or the like, similarly to the separation unit 51 .
- the demultiplexer 53 receives the upstream optical signal from the optical transmission line P7 and outputs the input upstream optical signal to the optical transmission line P4 between the wavelength multiplexer/demultiplexer 6 .
- the separating unit 53 also receives the downstream optical signal output from the wavelength multiplexing/demultiplexing unit 6 from the optical transmission line P4, and outputs the received downstream optical signal to the optical transmission line P8.
- the wavelength multiplexing/demultiplexing unit 6 has a plurality of first ports (not shown) and one second port (not shown). A plurality of first ports of the wavelength multiplexer/demultiplexer 6 correspond to different wavelengths. The first ports of the wavelength multiplexing/demultiplexing unit 6 are respectively connected to the different second ports 42 of the optical SW4 via optical transmission lines P4. A second port of the wavelength multiplexing/demultiplexing unit 6 is connected to the optical transmission line P10. The wavelength multiplexing/demultiplexing unit 6 multiplexes upstream optical signals of different wavelengths input from the optical SW 4 through a plurality of first ports, and outputs the multiplexed optical signals from the second port.
- the wavelength multiplexing/demultiplexing unit 6 inputs the downstream optical signal transmitted through the optical transmission line P10 from the second port, and demultiplexes the input downstream optical signal into optical signals of different wavelengths.
- the wavelength multiplexing/demultiplexing unit 6 outputs the demultiplexed downstream optical signals from separate first ports.
- the wavelength multiplexer/demultiplexer 6 is an AWG (Arrayed Waveguide Grating).
- the control device 7 is, for example, an APN controller.
- the control device 7 includes an optical transmitter/receiver (TRx) 71 , an optical receiver (Rx) 72 and a controller 73 .
- One or both of the optical transmitter/receiver 71 and the optical receiver 72 may be provided outside the control device 7, and may be provided in the optical GW 3, for example.
- the control device 7 may include a plurality of optical transmitter/receivers 71 and a plurality of optical receivers 72 .
- each optical transceiver 71 is connected to a different setting second port 42 .
- each optical receiver 72 is connected to a different optical splitter 5 .
- the optical transceiver 71 transmits and receives optical signals.
- the optical transmitter/receiver 71 may be a wavelength tunable optical transmitter/receiver or a fixed wavelength optical transmitter/receiver.
- the functions of the optical transceiver 71 are the same as those of the optical transceiver 21 of the user device 2 .
- the optical transmitter/receiver 71 is connected to the second port 42 for setting the optical switch 4 via the optical transmission lines P4, P5 and P6 and the separator 32 .
- the optical transmitter/receiver 71 outputs an optical signal addressed to the user device 2 to the optical SW4.
- the optical transmitter/receiver 71 also receives an optical signal transmitted from the user device 2 and output from the second setting port 42 of the optical SW 4 .
- the optical signal transmitted/received by the optical transmitter/receiver 71 is a management control signal for the AMCC signal.
- the optical receiver 72 receives an optical signal.
- the optical receiver 72 may be a wavelength tunable optical receiver or a fixed wavelength optical receiver.
- An optical transceiver such as an optical transceiver may be used as the optical receiver 72 .
- the optical receiver 72 receives the optical signal branched by the optical branching unit 5 from the optical transmission line P9, and converts the received downstream optical signal into an electrical signal.
- the optical receiver 72 separates the management control signal of the AMCC signal from the converted electrical signal.
- the control unit 73 includes a measurement unit 74 , a route control unit 75 and an instruction unit 76 .
- the route control unit 75 determines allocation resources such as transmission routes and transmission/reception wavelengths used by each user device 2 .
- the path control unit 75 instructs the user equipment 2 on the transmission/reception wavelength based on the determined allocated resource.
- the path control unit 75 instructs the optical SW 4 about the port connection relationship between the first port 41 and the second port 42 of the optical SW 4 based on the determined allocated resources.
- the measurement unit 74 transmits an AMCC management control signal from the optical transmission/reception unit 71 to the user device 2 and receives a response signal to the transmitted management control signal from the user device 2 .
- the measurement unit 74 measures the transmission distance between the control device 7 and the user device 2 based on the difference between the transmission time of the management control signal and the reception time of the response signal.
- the transmission distance between the optical SW 4 and the control device 7 is very short compared to the transmission distance between the control device 7 and the user device 2 . Therefore, the measured transmission distance between the control device 7 and the user device 2 is regarded as the transmission distance between the user device 2 and the optical SW4.
- the transmission distance between the optical SW4 and the optical branching unit 5 is also short, the transmission distance between the user device 2 and the optical SW4 is regarded as the transmission distance between the user device 2 and the optical branching unit 5. .
- the measurement unit 74 calculates the transmission distance between the optical SW4 and the control device 7 from the measured transmission distance between the control device 7 and the user device 2.
- the transmission distance between the user device 2 and the optical SW4 may be calculated by subtracting the transmission distance between. Thereby, even if the transmission distance between the optical SW4 and the control device 7 is long, the transmission distance between the user device 2 and the optical SW4 can be calculated more accurately.
- the attenuation amount of the light power when the light output from the light SW 4 is received by the light transmitting/receiving section 71 of the control device 7 is measured in advance.
- the transmission distance between the optical SW4 and the control device 7 can be calculated based on the measured attenuation.
- the instruction unit 76 calculates the branch ratio to be set in the optical branch switch 52 based on the transmission distance measured by the measurement unit 74 .
- the instructing unit 76 instructs the calculated branching ratio to the optical branching unit 5 on the optical transmission line P4 that transmits the optical signal from the user device 2 whose transmission distance has been measured.
- FIG. 2 is a diagram showing the configuration of the branching ratio variable coupler 501.
- the branching ratio variable coupler 501 is used as the optical branching switch 52 .
- a variable branching ratio coupler 501 has a base 512 with a fiber 511 and a base 514 with a fiber 513 .
- the fiber 511 is used as part of the optical transmission line P7, or is connected to the optical transmission line P7 on the separating section 51 side and the optical transmission line P7 on the separating section 53 side.
- the fiber 511 is used as part of the optical transmission line P9 or connected to the optical transmission line P9.
- the light propagating through the fiber 511 can be coupled to the adjacent fiber 513, so that the light can be split.
- the splitting ratio can be adjusted by changing the distance between the cores of fibers 511 and 513 .
- the distance between the core of the fiber 511 and the core of the fiber 513 can be adjusted by moving the base 514 with a motor so that the distance corresponds to the branching ratio instructed by the controller 7 .
- the top surface of platform 512 with fiber 511 lies on the xz plane, and optical signals are transmitted along the x-axis.
- the stage 514 is moved in the y-axis direction to change the branching ratio, but it may be moved in the z-axis direction.
- FIG. 3 is a diagram showing the configuration of the PLC 505.
- the PLC 505 can be used as the optical branch switch 52 .
- the PLC 505 has waveguides 551 and 552 , a power supply 554 and a thin film heater 555 .
- the waveguide 551 is used as part of the optical transmission line P7, or is connected to the optical transmission line P7 on the separating section 51 side and the optical transmission line P7 on the separating section 53 side.
- the waveguide 552 is used as part of the optical transmission line P9 or connected to the optical transmission line P9.
- a coupler 553 is formed in part of the waveguides 551 and 552 . At coupler 553 a portion of the light propagating in waveguide 551 is coupled into waveguide 552 .
- the PLC 505 controls the power supply 554 so that the power supplied to the thin film heater 555 corresponds to the branching ratio instructed by the controller 7 .
- a path Q1 between the first port 41 connected to the user device 2-1 and the second setting port 42 is set in the optical SW4.
- the optical SW 4 outputs the management control signal input from the second setting port 42 from the first port 41 to which the user device 2-1 is connected.
- the optical transmitter/receiver 21 of the user device 2-1 receives the optical signal output from the first port 41 by the optical SW4, and acquires the management control signal of the AMCC signal from the received optical signal.
- the measurement unit 74 of the control device 7 transmits a message M1 in which a time stamp indicating the current time t1 is set from the optical transmission/reception unit 71. .
- Message M1 is a management control signal for AMCC signals.
- the optical SW 4 outputs the message M1 input from the second setting port 42 from the first port 41 to which the user device 2-1 is connected.
- the optical transmitter/receiver 21 of the user device 2-1 receives the message M1.
- the user device 2-1 transmits from the optical transmitter/receiver 21 a message M2 in which the time stamp obtained from the message M1 is set.
- Message M2 is a management control signal for the AMCC signal.
- the optical SW 4 outputs the message M2 input from the first port 41 from the second setting port 42 .
- the optical transmitter/receiver 71 of the control device 7 outputs the received message M2 to the measuring section 74 .
- the measuring unit 74 of the control device 7 determines the frame round-trip propagation time RTT (Round Trip Time).
- the measurement unit 74 multiplies the RTT by the refractive index [m/ ⁇ s] in the fiber to calculate the transmission distance between the user device 2-1 and the light SW4.
- the measuring unit 74 subtracts the transmission distance between the optical switch 4 and the control device 7 from the transmission distance obtained by multiplying the RTT by the refractive index in the fiber, You may calculate the transmission distance between SW4.
- the path control unit 75 of the control device 7 determines the upstream and downstream communication wavelengths and the transmission path to be assigned to the user device 2-1 according to the communication destination of the user device 2-1.
- the path control unit 75 transmits from the optical transmission/reception unit 71 a message M3 in which the wavelength to be assigned to the user equipment 2-1 is set.
- Message M3 is a management control signal for the AMCC signal.
- the optical SW 4 outputs the message M3 input from the second setting port 42 from the first port 41 to which the user device 2-1 is connected.
- the user device 2-1 sets the wavelength assigned by the message M3 to the optical transmitter/receiver 21.
- FIG. Furthermore, the path control unit 75 of the control device 7 sets the port connection relationship of the path Q2 to the optical SW4. As a result, the path Q1 of the optical SW4 is switched to the path Q2 between the first port 41 connected to the user device 2-1 and the second port 42 connected to the wavelength multiplexing/demultiplexing unit 6.
- the instruction unit 76 calculates the intensity of light when the light transmitted from the optical transceiver 21 of the user device 2 reaches the optical GW 3. do.
- the instruction unit 76 stores in advance a relational expression representing the relationship between the transmission distance and the light intensity, and substitutes the value of the transmission distance between the user device 2-1 and the optical GW 3 into the relational expression to determine the intensity.
- the relational expression may be a relational expression according to the characteristics of the optical transmission line P1 between the user device 2-1 and the optical GW3.
- the relational expression may be a relational expression using the characteristics of the optical transmission line P1 between the user equipment 2-1 and the optical GW 3 as parameters in addition to the transmission distance.
- the instruction unit 76 stores in advance a value representing the characteristics of the optical transmission line P1.
- the instruction unit 76 calculates, from the light having the calculated intensity, a branching ratio for branching light having an intensity at which the AMCC signal can be received by the light receiving unit 72 with the minimum light receiving sensitivity.
- the instructing unit 76 instructs the calculated branching ratio to the optical branching unit 5 on the transmission path set in process 5 .
- the optical branching unit 5 controls the optical branching switch 52 so as to branch at the branching ratio instructed by the instructing unit 76 .
- the optical transmitter/receiver 21 of the user device 2-1 converts the electrical signal in which the AMCC control signal is superimposed on the main signal into an optical signal with the wavelength set in process 5, and transmits the optical signal.
- the optical SW4 outputs the optical signal input from the first port 41 from the second port 42 set by the path Q2.
- the optical branching switch 52 of the optical branching unit 5 receives the optical signal output from the second port 42 , and the optical signal branched from the input optical signal at the branching ratio set in the process 6 is received by the control device 7 .
- the optical receiver 72 of the controller 7 acquires the AMCC control signal from the received optical signal and outputs it to the controller 73 .
- An optical signal that is not branched by the optical branch switch 52 of the optical branching unit 5 is output to the optical transmission line P10 via the wavelength multiplexing/demultiplexing unit 6 .
- the optical communication system 1 adjusts the branching ratio of the optical branch switch 52 according to the transmission distance between each user device 2 and the optical GW 3 .
- the branching ratio of the optical branching switch 52 can be optimized, so that the transmission distance of the main signal can be maximized.
- the control device determines the branching ratio based on the transmission distance between the optical GW and the user device. In this embodiment, the control device determines the branching ratio based on the received power of the light branched by the optical branching unit. This embodiment will be described with a focus on differences from the first embodiment.
- FIG. 4 is a diagram showing the configuration of the optical communication system 12 according to the second embodiment.
- the optical communication system 12 differs from the optical communication system 1 of the first embodiment in that it includes a control device 8 instead of the control device 7 .
- the control device 8 includes an optical transceiver 71 , an optical receiver 72 , and a controller 83 .
- the control unit 83 includes a route control unit 75 , a measurement unit 84 and an instruction unit 86 .
- the measurement unit 84 may be provided outside the control unit 83 or may be provided outside the control device 8 .
- the measurement unit 84 is a power monitor.
- the measuring section 84 measures the reception power of the light received by the optical receiving section 72 and outputs it to the instructing section 86 .
- the instructing unit 86 changes the branching ratio of the optical branching unit 5 so that the optical receiving unit 72 approaches the minimum light receiving sensitivity at which the AMCC signal can be received. That is, when the received power is greater than the minimum light receiving sensitivity, the instructing unit 86 reduces the power of the light branched to the light receiving unit 72 by a predetermined change amount, or reduces the received power to the minimum light receiving power.
- the optical splitter 5 is instructed to change the branching ratio by a change amount corresponding to the deviation from the sensitivity.
- the instructing unit 86 increases the power of the light branched to the light receiving unit 72 by a predetermined change amount, or increases the received power at the minimum light receiving power.
- the optical splitter 5 is instructed to change the branching ratio by a change amount corresponding to the deviation from the sensitivity.
- the instruction unit 86 may change the branching ratio of the optical branching unit 5 so as to approach a target range, which is a predetermined light receiving sensitivity range in which the optical receiving unit 72 can receive the AMCC signal.
- the target range can be any range of photosensitivity greater than or equal to the minimum photosensitivity. If the received power is greater than a predetermined target range, the instructing unit 86 reduces the power of the light branched to the optical receiving unit 72 by a predetermined amount of change or from the target range of the received power.
- the optical branching unit 5 is instructed to change the branching ratio by a change amount corresponding to the deviation of .
- the instructing unit 86 increases the power of the light branched to the optical receiving unit 72 by a predetermined change amount or from the target range of the received power.
- the optical branching unit 5 is instructed to change the branching ratio by a change amount corresponding to the deviation of .
- the instructing unit 86 After instructing to change the branching ratio, the instructing unit 86 receives the measured value of the reception power received by the optical receiving unit 72 from the measuring unit 84 . Upon receiving feedback of the reception power, the instructing unit 86 repeats the process of changing the branching ratio of the optical branching unit 5 again so that the reception power approaches the minimum photosensitivity or the target range. Note that when changing the branching ratio so that the received power approaches the minimum photosensitivity, the instruction unit 86 does not instruct to change the branching ratio if the difference between the received power and the minimum photosensitivity is less than a predetermined value. can be
- the wavelength multiplexing/demultiplexing section has a single core configuration.
- the wavelength multiplexing/demultiplexing unit has a two-core configuration. This embodiment will be described with a focus on differences from the first embodiment.
- FIG. 5 is a diagram showing the configuration of the optical communication system 13 of the third embodiment.
- the optical communication system 13 differs from the optical communication system 1 of the first embodiment in that it includes an optical GW 3a instead of the optical GW3.
- the optical GW 3a differs from the optical GW 3 of the first embodiment in that it includes an optical branching unit 5a and a wavelength multiplexing/demultiplexing unit 6a instead of the optical splitting unit 5 and the wavelength multiplexing/demultiplexing unit 6.
- FIG. 5 is a diagram showing the configuration of the optical communication system 13 of the third embodiment.
- the optical communication system 13 differs from the optical communication system 1 of the first embodiment in that it includes an optical GW 3a instead of the optical GW3.
- the optical GW 3a differs from the optical GW 3 of the first embodiment in that it includes an optical branching unit 5a and a wavelength multiplexing/demultiplexing unit 6a instead of the optical splitting unit 5 and the wavelength multiplexing/demultiplexing unit 6.
- the optical branching unit 5a is connected to the optical SW4 by an optical transmission line P4, and is connected to the wavelength multiplexing/demultiplexing unit 6a by an optical transmission line P7 and an optical transmission line P8.
- the optical branching unit 5 a includes a separating unit 51 a and an optical branching switch 52 .
- the separation unit 51a receives the upstream optical signal output from the second port 42 of the optical SW4 through the optical transmission line P4, and outputs the received upstream optical signal to the optical transmission line P7.
- the demultiplexer 51a also receives the downstream optical signal output from the optical transmission line P8 by the wavelength multiplexer/demultiplexer 6a, and outputs the input downstream optical signal to the optical transmission line P4.
- the wavelength multiplexing/demultiplexing unit 6a is a two-core AWG.
- a plurality of first ports of the wavelength multiplexer/demultiplexer 6a are respectively connected to the optical transmission line P7 or the optical transmission line P8.
- the wavelength multiplexing/demultiplexing unit 6a receives upstream optical signals of different wavelengths output by the optical SW4 from a plurality of first ports connected to the optical transmission line P7, multiplexes the input optical signals, and outputs them to the second port. to the optical transmission line P10. Further, the wavelength multiplexing/demultiplexing unit 6a inputs the downstream optical signal transmitted through the optical transmission line P10 from the second port, and demultiplexes the input downstream optical signal into optical signals of different wavelengths.
- the wavelength multiplexing/demultiplexing unit 6a outputs the demultiplexed downstream optical signals from separate first ports to the optical transmission line P8.
- the difference between the third embodiment and the first embodiment described above may be applied to the second embodiment. That is, the optical communication system 12 of the second embodiment shown in FIG. 4 may be provided with the optical GW 3a of the third embodiment instead of the optical GW3.
- the optical communication system of this embodiment has a plurality of mutually connected optical GWs. This embodiment will be described with a focus on differences from the first embodiment. Note that the difference between the fourth embodiment and the first embodiment may be applied to the second embodiment.
- FIG. 6 is a diagram showing the configuration of the optical communication system 14 of the fourth embodiment.
- the optical communication system 14 differs from the optical communication system 1 of the first embodiment in that the optical GW 3 is connected to another optical GW 3 via an optical transmission line P10.
- the optical communication system 14 has two optical GWs 3 in FIG. 6, it may have three or more optical GWs 3 .
- the control device 7 has a plurality of optical transceivers 71 and optical receivers 72, respectively. Each of the plurality of optical transceivers 71 is connected to an optical SW4 of a different optical GW3. Each of the plurality of optical receivers 72 is connected to the optical splitter 5 of a different optical GW 3 .
- the path control unit 75 of the control device 7 can determine transmission paths between user devices 2 connected to different optical GWs 3 .
- the route control unit 75 determines transmission/reception wavelengths to be assigned to the user devices 2 and port connection relationships in the optical SW 4 of each optical GW 3 so that the user devices 2 transmit and receive optical signals using the determined transmission paths. do.
- the path control unit 75 notifies each user device 2 of the transmission/reception wavelength and instructs the optical SW 4 of each optical GW 3 about the port connection relationship, as in the first embodiment.
- the measurement unit 74 and the instruction unit 76 of the control device 7 perform the same processing as in the first embodiment on the user device 2 connected to each optical GW 3 and the optical branching unit 5 of each optical GW 3 .
- the optical communication system calculates the transmission distance between the user equipment and the optical GW in the same manner as in the first to third embodiments, An appropriate branching ratio can be set for the optical branching unit based on the calculated transmission distance. Further, by providing an optical branching unit in the path on the transmission side and setting the branching ratio in the optical branching unit as in the first embodiment, it is possible to maximize the transmission distance.
- the optical GW of the fourth embodiment has a single wavelength multiplexing/demultiplexing unit.
- the optical GW of this embodiment has two wavelength multiplexing/demultiplexing units. This embodiment will be described with a focus on differences from the above-described embodiment.
- FIG. 7 is a diagram showing the configuration of the optical communication system 15 of the fifth embodiment.
- the optical communication system 15 differs from the optical communication system 14 of the fourth embodiment in that the optical GW 3a of the third embodiment shown in FIG. 5 is provided instead of the optical GW3.
- the plurality of optical transceivers 71 of the control device 7 are respectively connected to the optical SW4 of different optical GWs 3a, and the plurality of optical receivers 72 are respectively connected to the optical branching units 5 of different optical GWs 3a.
- the operation of the optical communication system 15 is similar to that of the optical communication system 14 of the fourth embodiment.
- the configuration connected to the AWG may be a single-core configuration or a two-core configuration.
- FIG. 8 is a diagram showing the configuration of the optical communication system 16 of the sixth embodiment.
- the optical communication system 16 differs from the optical communication system 14 of the fourth embodiment in that it includes an optical GW 3b instead of the optical GW3.
- the optical GW 3 b has an optical SW 4 , an optical splitter 5 , and a wavelength multiplexer/demultiplexer 6 .
- Each of the plurality of first ports 41 of the optical SW4 corresponds to upstream or downstream.
- the first port 41 corresponding to the uplink is connected to the optical transmission/reception unit 21 of the user device 2 via the optical transmission line P1
- the first port 41 corresponding to the downlink is connected to the optical transmission/reception unit 21 of the user device 2 via the optical transmission line P2.
- the optical transmission/reception unit 21 of the user device 2 is connected to the two first ports 41 of the optical SW4 by the optical transmission lines P1 and P2, respectively.
- the plurality of second ports 42 of the optical SW4 respectively correspond to upstream or downstream.
- one or more second ports 42 are connected to the optical transmission/reception unit 71 of the control device 7 via the optical transmission line P6, and the other one or more second ports 42 are It is connected to the wavelength multiplexer/demultiplexer 6 via an optical transmission line P4.
- one or more second ports 42 are connected to the optical transmission/reception unit 71 of the control device 7 via the optical transmission line P5, and the other one or more second ports 42 are It is connected to the wavelength multiplexer/demultiplexer 6 via an optical transmission line P11.
- a plurality of first ports (not shown) of the wavelength multiplexer/demultiplexer 6 respectively correspond to upstream or downstream.
- a first port corresponding to the upstream of the wavelength multiplexing/demultiplexing unit 6 is connected to a second port 42 corresponding to the upstream of the optical SW4 via an optical transmission line P4, and a second port corresponding to the downstream of the wavelength multiplexing/demultiplexing unit 6 is connected.
- One port is connected to the second port 42 corresponding to the downlink of the optical SW4 via the optical transmission line P11.
- the procedure for setting the branching ratio for the optical branching unit 5 in the optical communication system 16 is the same as in the above-described embodiment.
- the optical communication system 16 performs upstream communication and downstream communication as follows.
- the optical transmission/reception unit 21 of the user device 2 outputs the optical signal to the optical transmission line P1.
- the optical switch 4 transmits an upstream optical signal of a predetermined wavelength input from the optical transmission line P1 through the first port 41 to the second port 42 corresponding to the upstream signal according to the transmission path to the destination of the optical signal. output to the second port 42; That is, the optical SW 4 is connected to the second setting port 42 connected to the optical transmission/reception unit 71 of the control device 7 via the optical transmission line P5, or to the second port 42 connected to the wavelength multiplexing/demultiplexing unit 6 via the optical transmission line P4. Outputs the upstream optical signal to the second port 42 .
- the optical branching unit 5 receives the optical signal output from the second port 42 corresponding to the upstream.
- the optical branching unit 5 outputs the optical signal branched from the input upstream optical signal to the optical receiving unit 72 of the control device 7 and outputs the optical signal not branched to the wavelength multiplexing/demultiplexing unit 6 .
- the wavelength multiplexing/demultiplexing unit 6 multiplexes the upstream optical signals that are output from the respective second ports 42 corresponding to the upstream of the optical SW 4 and are not split by the optical splitting unit 5, and outputs the multiplexed optical signals as optical signals. Output to transmission line P10.
- the wavelength multiplexing/demultiplexing unit 6 inputs the downstream optical signal transmitted through the optical transmission line P10, and demultiplexes the input downstream optical signal into optical signals of different wavelengths.
- the wavelength multiplexing/demultiplexing unit 6 outputs the demultiplexed downstream optical signals to different optical transmission lines P11.
- the optical transmission/reception unit 71 of the control device 7 outputs a downstream optical signal in which the control management signal of the AMCC signal is set to the optical transmission line P6.
- the optical switch 4 receives a downstream optical signal of a predetermined wavelength input from the second port 42 corresponding to the downstream, and sends it to the first port 41 corresponding to the downstream according to the transmission path to the destination of the optical signal. Output from the port 41 to the optical transmission line P2.
- the optical transmitter/receiver 21 of the user device 2 receives the optical signal transmitted through the optical transmission path P2.
- the first port 41 corresponding to the upward direction and the first port 41 corresponding to the downward direction may be alternately arranged, and the first port 41 corresponding to the upward direction and the first port 41 corresponding to the downward direction are arranged in the upper stage. and the lower stage.
- the upper stage may be the first port 41 corresponding to ascending
- the lower stage may be the first port 41 corresponding to descending. It may be one port 41 .
- the second port 42 corresponding to the upward direction and the second port 42 corresponding to the downward direction may be arranged alternately. may be arranged separately in the upper stage and the lower stage.
- the upper stage When divided into upper and lower stages, the upper stage may be the second port 42 corresponding to going up, and the lower stage may be the second port 42 corresponding to going down.
- a dual port 42 may also be used.
- the light SW 4 and the light branching unit 5 may be configured by one PLC.
- FIG. 9 is a device configuration diagram showing a hardware configuration example of the control devices 7 and 8.
- the control devices 7 and 8 comprise a processor 701 , a storage section 702 , a communication interface 703 and a user interface 704 .
- the processor 701 is a central processing unit that performs calculations and controls.
- Processor 701 is, for example, a CPU.
- the processor 701 implements the functions of the control unit 73 and the control unit 83 by reading out and executing programs from the storage unit 702 .
- the storage unit 702 also has a work area and the like used when the processor 701 executes various programs.
- a communication interface 703 is for communicably connecting to another device.
- the communication interface 703 is, for example, the optical receiver 72 .
- the user interface 704 is an input device such as a keyboard, pointing device (mouse, tablet, etc.), buttons, touch panel, etc., and a display device such as a display.
- a user interface 704 inputs an artificial operation.
- control unit 73 may be realized using hardware such as ASIC (Application Specific Integrated Circuit), PLD (Programmable Logic Device), and FPGA (Field Programmable Gate Array).
- ASIC Application Specific Integrated Circuit
- PLD Process
- FPGA Field Programmable Gate Array
- the branching of the optical branching unit for extracting the AMCC signal superimposed on the main signal from the optical signal transmitted by the user equipment according to the transmission distance between the user equipment and the optical GW Allows the ratio to be variable.
- the transmission distance of the main signal can be maximized by setting the branching ratio of the optical branching unit so that the APN controller has the minimum light receiving sensitivity for receiving the AMCC signal.
- the optical communication system has an optical switch, an optical branching section, a measurement section, and an instruction section.
- An optical switch has a plurality of ports, and outputs an optical signal input from a first port, which is a port connected to an optical communication device, from a second port, which is another port according to the transmission path of the optical signal. do.
- the optical branching unit branches the optical signal output from the second port of the optical switch according to the branching ratio.
- the measurement unit measures the round trip time by transmitting and receiving the optical signal to and from the optical communication device via the optical switch, and calculates the transmission distance of the optical signal based on the measured round trip time.
- the instruction section instructs the optical branching section of the branching ratio determined based on the transmission distance measured by the measurement section.
- the optical GW has an optical switch and an optical branching unit
- the control device has a measuring unit and an indicating unit.
- the instruction unit calculates the optical intensity of the optical signal transmitted over the transmission distance calculated by the measurement unit, and instructs the optical branching unit of a branching ratio for branching light of a predetermined optical intensity from the light of the calculated optical intensity.
- the measurement unit may measure the optical intensity of the optical signal branched by the optical branching unit.
- the instruction section instructs the optical branching section according to the difference between the measured optical signal intensity and the predetermined optical intensity so that the optical intensity of the optical signal measured by the measuring section approaches the predetermined optical intensity. Instructs to change the branching ratio.
- the predetermined light intensity is such that the optical receiving unit that receives the optical signal branched by the optical branching unit can acquire the management control signal that is superimposed on the main signal and has a lower speed than the main signal from the received optical signal. is light intensity.
- optical receiver 73, 83...control unit, 74, 84... measurement part, 75 ... route control unit, 76, 86... indicator, 96 ... APN controller, 97 ... optical transmission line, 98 ... splitter, 501 branching ratio variable coupler, 511, 513... fiber, 512, 514 units, 551, 552... waveguides, 553 ... Coupler, 554 power supply, 555... thin film heater, 701 processor, 702 ... storage unit, 703 ... communication interface, 704 ... user interface, P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11... optical transmission line
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Abstract
Description
図1は、第1の実施形態による光通信システム1の構成を示す図である。光通信システム1は、ユーザ装置2と、光GW3と、制御装置7とを有する。光通信システム1が有するユーザ装置2の台数は任意である。図1では、2台のユーザ装置2を、ユーザ装置2-1、2-2と記載している。光GW3は、光伝送路P10を介して図示しない光ネットワークと接続される。例えば、光ネットワークには、ユーザ装置2の通信先の装置が接続される、あるいは、光ネットワークは、ユーザ装置2の通信先の装置を収容するネットワークと接続される。ユーザ装置2から光GW3への方向を上り、光GW3からユーザ装置2への方向を下りと記載する。
図2は、分岐比可変カプラ501の構成を示す図である。分岐比可変カプラ501は、光分岐スイッチ52として用いられる。分岐比可変カプラ501は、ファイバ511を備える台512と、ファイバ513を備える台514とを有する。ファイバ511は、光伝送路P7の一部として用いられるか、分離部51側の光伝送路P7及び分離部53側の光伝送路P7に接続される。ファイバ511は、光伝送路P9の一部として用いられるか、光伝送路P9と接続される。
第1の実施形態では、制御装置は、光GWとユーザ装置との間の伝送距離に基づいて分岐比を決定していた。本実施形態では、制御装置は、光分岐部が分岐した光の受信パワーに基づいて分岐比を決定する。本実施形態を、第1の実施形態との差分を中心に説明する。
第1の実施形態及び第2の実施形態では、波長合分波部は、一心の構成である。本実施形態では、波長合分波部は、二心の構成である。本実施形態を、第1の実施形態との差分を中心に説明する。
本実施形態の光通信システムは、相互に接続される光GWを複数有する。本実施形態を、第1の実施形態との差分を中心に説明する。なお、第4の実施形態と第1の実施形態との差分を、第2の実施形態に適用してもよい。
第4の実施形態の光GWは、一心の波長合分波部を有する。本実施形態の光GWは、二心の波長合分波部を有する。本実施形態を、上述した実施形態との差分を中心に説明する。
第6の実施形態では、光SWのポートを上り専用のポート及び下り専用のポートに分ける。本実施形態を、上述した実施形態との差分を中心に説明する。
2、2-1、2-2、92-1-1~92-1-3、92-2-1~92-2-3…ユーザ装置,
3、3a、3b、93-1、93-2…光GW,
4、94-1、94-2…光SW
5、5a…光分岐部,
6、6a、95-1、95-2…波長合分波部,
7、8…制御装置,
21…光送受信部,
31、32…分離部,
41、941…第一ポート,
42、942…第二ポート,
51、51a、53…分離部,
52…光分岐スイッチ,
71…光送受信部,
72…光受信部,
73、83…制御部,
74、84…測定部,
75…経路制御部,
76、86…指示部,
96…APNコントローラ,
97…光伝送路,
98…スプリッタ,
501…分岐比可変カプラ,
511、513…ファイバ,
512、514…台,
551、552…導波路,
553…結合器,
554…電源,
555…薄膜ヒータ,
701…プロセッサ,
702…記憶部,
703…通信インタフェース,
704…ユーザインタフェース,
P1、P2、P3、P4、P5、P6、P7、P8、P9、P10、P11…光伝送路
Claims (8)
- 複数のポートを有し、光通信装置と接続される前記ポートである第一ポートから入力した光信号を、前記光信号の伝送経路に応じた他の前記ポートである第二ポートから出力する光スイッチと、
前記第二ポートから出力された前記光信号を分岐比に従って分岐する光分岐部と、
前記光スイッチを介して前記光通信装置と光信号を送受信することによりラウンドトリップタイムを測定し、測定された前記ラウンドトリップタイムに基づいて光信号の伝送距離を算出する測定部と、
算出された前記伝送距離に基づいて決定した分岐比を前記光分岐部に指示する指示部と、
を備える光通信システム。 - 複数のポートを有し、光通信装置と接続される前記ポートである第一ポートから入力した光信号を、前記光信号の伝送経路に応じた他の前記ポートである第二ポートから出力する光スイッチと、
前記第二ポートから出力された前記光信号を分岐比に従って分岐する光分岐部と、
分岐された前記光信号の光強度を測定する測定部と、
測定された前記光強度が所定の光強度に近づくように前記光分岐部に分岐比の変更を指示する指示部と、
を備える光通信システム。 - 複数のポートを有し、光通信装置と接続される前記ポートである第一ポートから入力した光信号を、前記光信号の伝送経路に応じた他の前記ポートである第二ポートから出力する光スイッチを介して前記光通信装置と光信号を送受信することによりラウンドトリップタイムを測定し、測定された前記ラウンドトリップタイムに基づいて光信号の伝送距離を算出する測定部と、
前記第二ポートから出力された前記光信号を分岐比に従って分岐する光分岐部に、算出された前記伝送距離に基づいて決定した分岐比を指示する指示部と、
を備える制御装置。 - 複数のポートを有し、光通信装置と接続される前記ポートである第一ポートから入力した光信号を、前記光信号の伝送経路に応じた他の前記ポートである第二ポートから出力する光スイッチが前記第二ポートから出力した光信号を分岐比に従って分岐する光分岐部において分岐された光信号の光強度を測定する測定部と、
測定された前記光強度が所定の光強度に近づくように前記光分岐部に分岐比の変更を指示する指示部と、
を備える制御装置。 - 複数のポートを有する光スイッチが、光通信装置と接続される前記ポートである第一ポートから入力された光信号を、前記光信号の伝送経路に応じた他の前記ポートである第二ポートから出力するスイッチングステップと、
光分岐部が、前記第二ポートから出力された前記光信号を分岐比に従って分岐する分岐ステップと、
測定部が、前記光スイッチを介して前記光通信装置と光信号を送受信することによりラウンドトリップタイムを測定し、測定された前記ラウンドトリップタイムに基づいて光信号の伝送距離を算出する測定ステップと、
算出された前記伝送距離に基づいて決定した分岐比を前記光分岐部に指示する指示ステップと、
を有する光通信方法。 - 複数のポートを有する光スイッチが、光通信装置と接続される前記ポートである第一ポートから入力した光信号を、前記光信号の伝送経路に応じた他の前記ポートである第二ポートから出力するスイッチングステップと、
光分岐部が、前記第二ポートから出力された前記光信号を分岐比に従って分岐する分岐ステップと、
測定部が、分岐された前記光信号の光強度を測定する測定ステップと、
指示部が、測定された前記光強度が所定の光強度に近づくように前記光分岐部に分岐比の変更を指示する指示ステップと、
を有する光通信方法。 - 複数のポートを有し、光通信装置と接続される前記ポートである第一ポートから入力した光信号を、前記光信号の伝送経路に応じた他の前記ポートである第二ポートから出力する光スイッチを介して前記光通信装置と光信号を送受信することによりラウンドトリップタイムを測定し、測定された前記ラウンドトリップタイムに基づいて光信号の伝送距離を算出する測定ステップと、
前記第二ポートから出力された前記光信号を分岐比に従って分岐する光分岐部に、算出された前記伝送距離に基づいて決定した分岐比を指示する指示ステップと、
を有する光通信方法。 - 複数のポートを有し、光通信装置と接続される前記ポートである第一ポートから入力した光信号を、前記光信号の伝送経路に応じた他の前記ポートである第二ポートから出力する光スイッチが前記第二ポートから出力した光信号を分岐比に従って分岐する光分岐部において分岐された光信号の光強度を測定する測定ステップと、
測定された前記光強度が所定の光強度に近づくように前記光分岐部に分岐比の変更を指示する指示ステップと、
を有する光通信方法。
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Title |
---|
"B-8-20: Photonic Gateway supporting All-Photonics Network", PROCEEDINGS OF THE 2021 GENERAL CONFERENCE OF THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS, 23 February 2021 (2021-02-23), pages 141, XP009545558 * |
TOMOAKI YOSHIDA AND OTHERS: "Photonic Gateway and optical access technology supporting APN", NTT TECHNICAL JOURNAL, DENKI TSUSHIN KYOKAI, TOKYO,, JP, vol. 33, no. 2, 1 February 2021 (2021-02-01), JP , pages 36 - 41, XP009545707, ISSN: 0915-2318 * |
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