WO2023223505A1 - 光ファイバ切替方法、及び、光通信装置 - Google Patents

光ファイバ切替方法、及び、光通信装置 Download PDF

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Publication number
WO2023223505A1
WO2023223505A1 PCT/JP2022/020844 JP2022020844W WO2023223505A1 WO 2023223505 A1 WO2023223505 A1 WO 2023223505A1 JP 2022020844 W JP2022020844 W JP 2022020844W WO 2023223505 A1 WO2023223505 A1 WO 2023223505A1
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WO
WIPO (PCT)
Prior art keywords
optical
communication device
optical fiber
optical communication
olt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/020844
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English (en)
French (fr)
Japanese (ja)
Inventor
栄伸 廣田
卓威 植松
一貴 納戸
裕之 飯田
和典 片山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to PCT/JP2022/020844 priority Critical patent/WO2023223505A1/ja
Priority to US18/863,003 priority patent/US20250306288A1/en
Priority to JP2024521486A priority patent/JP7794307B2/ja
Publication of WO2023223505A1 publication Critical patent/WO2023223505A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04B10/25—Arrangements specific to fibre transmission
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/35—Optical coupling means having switching means
    • G02B6/3586—Control or adjustment details, e.g. calibrating
    • 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
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0795—Performance monitoring; Measurement of transmission parameters
    • H04B10/07955—Monitoring or measuring power

Definitions

  • the present disclosure relates to a technology for switching connections between optical fibers in an optical communication network.
  • the optical access network provides Internet and telephone services to users.
  • optical fibers are switched from the originally used equipment to the new equipment.
  • the original optical fiber is used for communication, but during the optical fiber switching work, the optical fiber is cut and fusion spliced, etc. had stopped.
  • the present disclosure aims to reduce communication outage time that occurs due to optical fiber switching.
  • the optical fiber switching method of the present disclosure includes: The communication partner of the first optical communication device connected to the first optical fiber is changed from the second optical communication device connected to the first optical fiber to the third optical communication device connected to the second optical fiber.
  • an optical fiber switching method for switching to optical communication equipment Polishing the side surfaces of the first optical fiber and the second optical fiber to the vicinity of the core, configuring an optical coupler that couples the first optical fiber and the second optical fiber by bringing polished surfaces of the first optical fiber and the second optical fiber close to each other, The optical coupler is used to switch from the second optical communication device to the third optical communication device.
  • the present disclosure configures an optical coupler using a first optical fiber and a second optical fiber, and connects a first optical communication device and a third optical communication device using the optical coupler. It is possible to switch from the second optical communication device to the third optical communication device without cutting the optical fiber. Therefore, the present disclosure can reduce communication outage time that occurs due to optical fiber switching.
  • the optical coupler is configured with the first optical communication device and the second optical communication device maintaining communication, and the first optical communication device and the second optical communication device transmit and receive data.
  • the conditions for coupling light in the optical coupler may be adjusted based on the optical signal.
  • the optical signal after blocking the optical signal transmitted from the second optical communication device, the optical signal may be transmitted from the third optical communication device to the first optical communication device.
  • the first optical communication device communicates with the second optical communication device and the third optical communication device, and the first optical communication device receives the first optical communication device from the second optical communication device while communicating with the second optical communication device and the third optical communication device.
  • the power of the optical signal is compared with the power of the second optical signal received from the third optical communication device, and when the power of the second optical signal becomes greater than the power of the first optical signal, the optical transmitting an instruction to stop transmitting a signal, and the second optical communication device of the second optical communication device and the third optical communication device receiving the instruction stopping transmitting the optical signal; Good too.
  • the first optical communication device may communicate with the second optical communication device and the third optical communication device using time division multiplex communication.
  • An optical communication device of the present disclosure is an optical communication device that functions as the first optical communication device,
  • the first optical fiber is connected to a second optical fiber connected to a third optical communication device by an optical coupler, While communicating between the second optical communication device and the third optical communication device, the power of the first optical signal received from the second optical communication device and the power of the first optical signal received from the third optical communication device Compare the power of the received second optical signal, An instruction to stop transmission of the optical signal is transmitted when the power of the second optical signal becomes greater than the power of the first optical signal.
  • 1 shows a schematic configuration of a switching point in the present disclosure.
  • An example of a method for manufacturing an optical coupler of the present disclosure is shown.
  • 1 shows an example of an optical coupler of the present disclosure. It shows the temporal change in the power of the ONU optical signal reaching each OLT.
  • the optical fiber 95 has a three-layer structure including a core 91, a cladding 92 surrounding the core, and a coating 94 for protecting the cladding 92.
  • the core 91 and the cladding 92 may be made of any material, this embodiment shows an example in which they are made of glass.
  • a portion made of glass including the core 91 and the cladding 92 will be referred to as a glass portion 93.
  • the main component of the core 91 is pure silica glass, and germanium dioxide is used as an additive. The refractive index is increased by adding germanium dioxide.
  • the cladding 92 is designed to have a lower refractive index than the core 91 by being made of only pure silica glass. Since the core 91 and the cladding 92 have different refractive indexes, total reflection occurs at the interface and the optical signal propagates within the core 91.
  • a device 80#1 and a device 80#2 are installed at both ends of an optical fiber 95.
  • each device 80 is recognized and optical communication is performed.
  • services such as the Internet and telephone services are provided to terminal users.
  • FIG. 3 shows a wiring configuration for providing services.
  • An optical line terminal (OLT) 81 is installed in a communication building, and an optical network unit (ONU) 82 is installed at a user's terminal.
  • the OLT 81 and ONU 82 correspond to the device 80#1 and the device 80#2.
  • the optical signals output from the OLT 81 and the ONU 82 have different wavelengths.
  • the wavelength output from ONU 82 #1 is defined as wavelength ⁇ 1
  • the wavelength output from OLT 81 #1 is defined as wavelength ⁇ 2.
  • an integrated distribution module (IDM) 83 and an optical cable 84 in which a plurality of optical fibers 95 are bundled are used to connect the OLT 81 and the ONU 82 in a communication building.
  • IDM integrated distribution module
  • Telecommunications buildings deteriorate as time passes after they are constructed. For example, an event may occur when concrete cracks and water enters through the cracks. There are a large number of electrical devices such as OLT81 installed in the building, and moisture entering the building could affect the electrical devices and, in the worst case, cause them to shut down. In other words, it becomes impossible to provide services to terminal users.
  • a new communication building is constructed, a new OLT 81#2 is installed in the communication building, and services are provided using optical signals from the OLT 81#2. To do this, it is necessary to switch to a new optical cable 84-2 somewhere on the optical cable 84-1.
  • the optical fiber in the old optical cable 84-1 extending from the old communication building is cut at the switching point PS that can be reached by the optical cable 84-2 of the optical cable 84-1, and the new optical fiber is replaced.
  • FIG. 5 shows the cutting process
  • FIG. 6 shows the connecting process.
  • the optical fiber contained in the optical cable 84-1 is taken out, the coating 94-1 of the optical fiber is removed to expose the glass portion 93-1, and both ends of the glass portion 93-1 are placed on the fixing base 21.
  • the press base 22 is moved upward from the bottom, the glass portion 93-1 of the optical fiber is sandwiched between the cutter 23, such as a metal blade, and the press base 22.
  • the blade of the cutter 23 By moving the blade of the cutter 23 toward you, the blade of the cutter 23 comes into contact with the glass portion 93-1 and scratches the glass portion 93-1. Due to the pressure from the pressing table 22, cracks appear in the scratched glass portion 93-1, and the optical fiber in the optical cable 84-1 is severed.
  • FIG. 6 shows an example of a method for connecting optical fibers.
  • the optical fiber 95-1 in the optical cable 84-1 and the optical fiber 95-2 in the optical cable 84-2 are arranged so as to face each other, and the cores of the glass parts 93-1 and 93-2 are aligned with high precision. . Thereafter, electric discharge is generated from the electrode rod 24 to melt the end surfaces of the glass parts 93-1 and 93-2, thereby connecting the optical fibers 95-1 and 95-2 (for example, see Non-Patent Document 1).
  • optical fiber 95-1 is cut and the optical fibers 95-1 and 95-2 are reconnected. Since the optical fiber 95-1 is cut, the optical signal propagating within the optical fiber 95-1 also stops.
  • the time required for these construction works that is, the time during which communication is interrupted, is about 5 to 10 minutes. Therefore, in the present disclosure, in order to reduce communication outage time, optical fibers are more preferably switched from an old communication building to a new communication building without stopping communication.
  • FIG. 7 shows drawings before and after switching.
  • the figure shows an optical signal output from ONU 82#1.
  • an optical coupler 85 is configured to couple the optical fibers 95-1 and 95-2 to the switching point PS, and by using the optical coupler 85, the optical signal from the ONU 82#1 is transferred from the OLT 81#1 to the OLT 81#.
  • Optical couplers combine and branch optical signals.
  • ONU 82#1 functions as a first optical communication device
  • OLT 81#1 functions as a second optical communication device
  • OLT 81#2 functions as a third optical communication device
  • Optical fiber 95-1 functions as a first optical fiber
  • optical fiber 95-2 functions as a second optical fiber.
  • the optical signal from OLT 81#1 to ONU 82#1 functions as a first optical signal
  • the optical signal from OLT 81#2 to ONU 82#1 functions as a second optical signal.
  • the optical fiber switching method of the present disclosure connects the communication partner of ONU 82 #1 connected to optical fiber 95-1 to optical fiber 95-2 from OLT 81 #1 connected to optical fiber 95-1.
  • FIG. 8 shows a schematic configuration of the switching point PS in the present disclosure.
  • an optical coupler 85 is configured at the switching point PS to couple the optical signal propagating through the core of the optical fiber 95-1 to the core of the optical fiber 95-2.
  • optical signals are switched as shown in FIG. 7 by configuring the optical coupler 85 at the switching point PS.
  • the optical coupler 85 can have any configuration, but for example, the optical coupler 85 is made by polishing the optical fiber 95-1 from the side.
  • the optical fiber 95-1 is shown in FIG. 1 to be composed of a coating 94, a cladding 92, and a core 91 from the outside.
  • the ONU 82#1 and the OLT 81#1 maintain communication without cutting off, and the optical signal propagates inside the core 91 of the optical fiber 95-1.
  • FIG. 9 shows an optical coupler 85 manufactured by polishing the side surface of an optical fiber 95.
  • FIG. 9 shows a cross-sectional view of side processing of optical fibers 95-1 and 95-2.
  • the coating layer is omitted in the drawing (FIG. 9(a))
  • the coating covering the optical fiber 95-1 is polished, and the cladding 92 is further polished (FIG. 9(b)), and the core 91 is polished. Polishing is continued to the vicinity (FIG. 9(c)).
  • the optical fiber 95-2 is also polished in the same manner as the optical fiber 95-1 (FIG. 9(d)).
  • the present disclosure is characterized in that the polishing of the optical fibers 95-1 and 95-2 does not reach the core 91. During polishing, the loss may be evaluated while inputting an optical signal to the optical fiber 95-1. In this case, the loss remains below 0.5 dB.
  • a feature of the present disclosure is that communication is not interrupted by polishing the optical fiber 95-1.
  • the conditions for coupling light in the optical coupler 85 may be adjusted based on the optical signals transmitted and received by the OLTs 81#1 and 81#2.
  • the power of the optical signal transmitted from ONU 82#1 is measured by optical fibers 95-1 and 95-2 after being branched by optical coupler 85. This measurement can be performed by bending the optical fibers 95-1 and 95-2 and using leaked light from the curved portions.
  • the optical signal propagating through the core 91 of the optical fiber 95-1 can be seen. can be transferred to the core 91 of the optical fiber 95-2.
  • the positions of the optical fibers 95-1 and 95-2 the conditions for coupling the optical fibers 95-1 and 95-2 can be adjusted.
  • the bonding conditions are determined by the distance in the longitudinal direction in the state shown in FIG. 9(e), the distance between the two cores 91, etc. Calculations can be made by using the join conditions as parameters.
  • a part of the optical signal is propagated as branched light to the fiber 95-2 side, but by changing the coupling conditions, 100% of the power of the optical signal in the optical fiber 95-1 is transferred to the optical fiber 95-2.
  • half of the power of the optical signal in optical fiber 95-1 can be transferred to optical fiber 95-2.
  • FIG. 10 shows an example of the calculation result of branching in the optical coupler 85. It can be seen that by bonding the two polished optical fibers together and adjusting their positions, a part of the optical signal propagating through the core of optical fiber 95-1 is transferred to the core of optical fiber 95-2. As mentioned above, the amount of power transferred from optical fiber 95-1 to optical fiber 95-2 is determined by the coupling conditions.
  • FIG. 11 shows temporal changes in the optical signal from the ONU 82 reaching each OLT 81#1 and 81#2.
  • the horizontal axis shows the time axis before switching, during switching, and after switching, and the vertical axis shows the power of the optical signal output from the ONU 1 reaching each OLT.
  • the power shifts As shown in FIG. 11, as the two fiber cores 91 approach each other, the power shifts.
  • OLTs 81 since there are two OLTs 81, when optical signals are transmitted from both OLTs 81#1 and OLT 81#2 during switching, the optical signals of OLTs 81#1 and OLTs 81#2 overlap as shown in FIG. . If the two signals from OLT81#1 and OLT81#2 arrive at ONU82#1 in duplicate, ONU82#1 will be unable to process the optical signals, so communication between OLT81#1 and OLT81#2 and ONU82#1 will be interrupted. stops.
  • a configuration is provided to prevent overlapping communication between OLT 81#1 and OLT 81#2.
  • the optical signal transmitted from the OLT 81#1 is blocked. For example, as shown in FIG. 13(a), communication from OLT 81#1 is stopped by bending 95-1B to optical fiber 95-1 extending from OLT 81#1.
  • the optical fiber 95-1 may be cut as shown in FIG. 13(b).
  • communication from OLT 81#1 is stopped before positioning is performed using optical coupler 85 located at switching point PS.
  • optical coupler 85 located at switching point PS.
  • communication from OLT 81#1 is stopped, so it is possible to prevent two optical signals from OLT 81#1 and OLT 81#2 from overlapping and reaching ONU 82#1.
  • the optical signal from the OLT 81#2 side reaches the ONU 82#1 side.
  • An optical signal is also output from ONU 82#1 and reaches OLT 81#2.
  • Bidirectional communication between OLT 81#2 and ONU 82#1 begins. Communication stops until communication of OLT 81#1 is stopped and communication of OLT 81#2 is started.
  • optical signals are output from OLT81#1 and OLT81#2, ONU82#1, OLT81#1, and OLT81#2 are provided with a function to control the optical signals so that they do not overlap.
  • the optical signals from each OLT 81#1 and 81#2 do not overlap, as shown in FIG. If it is known that the optical signals from OLT 81 #1 and OLT 81 #2 come alternately at predetermined intervals, it is possible to prevent communication from stopping at ONU 82 #1.
  • FIG. 15A shows the state before the optical coupler 85 is made, and shows that the OLT 81#1 and the ONU 82#1 are communicating.
  • the optical signal from the ONU 82#1 is branched and reaches the OLT 81#1 and the OLT 81#2, as shown in FIG. 15(b).
  • FIG. 15(c) shows that the timing for outputting the optical signal from OLT 81#2 is after the optical signal from ONU 82#1 arrives.
  • the optical signal from ONU 82#1 can include an optical signal that controls the timing of OLT 81#1 and OLT 81#2. Therefore, as shown in FIG. 14, the timing of the optical signals output from each of the OLTs 81#1 and 81#2 in the old communication building and the new communication building can be controlled.
  • FIG. 16 shows the magnitude of the power of OLT 81 #1 and OLT 81 #2 that ONU 82 #1 receives during switching.
  • the ONU 82#1 is provided with a function that can receive the magnitude of the power arriving from each OLT 81#1 and 81#2.
  • FIG. 16(a) Before the optical coupler 85 was manufactured, as shown in FIG. 16(a), there was only an optical signal from the OLT 81#1 installed in the old communication building. When the optical coupler 85 is used, the power of the OLT 81#1 decreases and the power of the OLT 81#2 increases, as shown in FIG. 16(b).
  • the powers of the OLT 81#1 and the OLT 81#2 become the same, as shown in FIG. 16(c).
  • the ONU 82#1 issues an instruction to stop the optical signal from the OLT 81#1.
  • the instruction from the ONU 82#1 is divided into two by the optical coupler 85 provided at the switching point PS, but since this is an instruction that only the OLT 81#1 follows, the power of the OLT 81#1 is turned off and no optical signal is output from the OLT 81#1. Therefore, as shown in FIG. 16(d), the power of OLT 81#1 is lost.
  • the optical signal output from the OLT 81#2 can be adjusted as shown in FIG.
  • the optical coupler 85 can couple to the optical fiber 95-1 without causing any loss. Finally, remove OLT81#1.
  • FIG. 17 shows how the ONU 82#1 is provided with the function of receiving the magnitude of the power arriving from each OLT 81#1 and 81#2. This shows that the ONU 82 is connected to the optical fiber 95-1, receives an optical signal from the OLT 81, and outputs the optical signal itself.
  • FIG. 17 shows the internal structure of the ONU 82.
  • the ONU 82 includes a light source (laser) 31, a photodiode 32, a wavelength separation filter 33, and a signal processing section 35.
  • a light source (laser) 31 is built inside the ONU 82, and the optical signal output from the ONU 82 is output from the light source 31.
  • a light source 31 and a photodiode 32 are provided to separate light reception and light emission.
  • a wavelength separation filter 33 is used. As specific wavelengths, a wavelength of 1310 nm is applied to the light source 31 and a wavelength of 1490 nm is applied to the photodiode 32. However, this wavelength also changes and can be changed depending on the system.
  • Optical signals from OLT 81 #1 and OLT 81 #2 reach the photodiode 32 alternately. Since the photodiode 32 can convert an optical signal into an electrical signal, it can naturally also convert the optical signals of the OLT 81#1 and OLT 81#2 into electrical signals.
  • a MAC address is given to the OLT 81 and ONU 82 in order to identify the devices. MAC in the MAC address is an abbreviation for Media Access Control, and is an identifier used for identification. Since the same number does not exist, the signal processing unit 35 uses this MAC address to identify and manage the device. Therefore, OLT81#1 and OLT81#2 have different identifiers.
  • the signal processing unit 35 can still read the MAC address.
  • a signal processing unit 35 capable of distinguishing the MAC address identification of the OLT 81 is provided after the photodiode 32, and the optical signals of the OLT 81#1 and the OLT 81#2 are distributed. That is, the signal processing unit 35 divides the optical signal into the OLT 81#1 and the OLT 81#2, and also measures the power of the received light. Therefore, by moving the optical fiber core of the optical coupler 85, the signal processing unit 35 included in the ONU 82 can distinguish between the OLTs 81#1 and 81#2, and can also display the received light power.
  • the signal processing unit 35 communicates with the OLTs 81#1 and 81#2 and compares the power of the first optical signal received from the OLT 81#1 and the power of the second optical signal received from the OLT 81#2. Compare. When the power of the second optical signal becomes greater than the power of the first optical signal, the signal processing unit 35 transmits an instruction to stop transmitting the optical signal. Of the OLTs 81#1 and 81#2 that have received this instruction, OLT 81#1 stops transmitting the optical signal.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)
PCT/JP2022/020844 2022-05-19 2022-05-19 光ファイバ切替方法、及び、光通信装置 Ceased WO2023223505A1 (ja)

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Application Number Priority Date Filing Date Title
PCT/JP2022/020844 WO2023223505A1 (ja) 2022-05-19 2022-05-19 光ファイバ切替方法、及び、光通信装置
US18/863,003 US20250306288A1 (en) 2022-05-19 2022-05-19 Optical fiber switching method
JP2024521486A JP7794307B2 (ja) 2022-05-19 2022-05-19 光ファイバ切替方法、及び、光通信装置

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002359596A (ja) * 2001-05-30 2002-12-13 Mitsubishi Electric Corp バースト光出力監視方法および装置
JP2014081491A (ja) * 2012-10-16 2014-05-08 Nippon Telegr & Teleph Corp <Ntt> 光通信線路切替装置及びこの切替装置を用いた光通信線路切替方法
JP2015169830A (ja) * 2014-03-07 2015-09-28 日本電信電話株式会社 光線路切替装置及び光線路切替方法
WO2020255235A1 (ja) * 2019-06-18 2020-12-24 日本電信電話株式会社 通信機器識別装置、光ファイバ接続システム、通信機器識別方法及び光ファイバ接続方法
WO2022009286A1 (ja) * 2020-07-06 2022-01-13 日本電信電話株式会社 光ファイバ及びその接続方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002359596A (ja) * 2001-05-30 2002-12-13 Mitsubishi Electric Corp バースト光出力監視方法および装置
JP2014081491A (ja) * 2012-10-16 2014-05-08 Nippon Telegr & Teleph Corp <Ntt> 光通信線路切替装置及びこの切替装置を用いた光通信線路切替方法
JP2015169830A (ja) * 2014-03-07 2015-09-28 日本電信電話株式会社 光線路切替装置及び光線路切替方法
WO2020255235A1 (ja) * 2019-06-18 2020-12-24 日本電信電話株式会社 通信機器識別装置、光ファイバ接続システム、通信機器識別方法及び光ファイバ接続方法
WO2022009286A1 (ja) * 2020-07-06 2022-01-13 日本電信電話株式会社 光ファイバ及びその接続方法

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