WO2020238503A1 - 光纤时间频率和数据联合传输系统和方法 - Google Patents

光纤时间频率和数据联合传输系统和方法 Download PDF

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Publication number
WO2020238503A1
WO2020238503A1 PCT/CN2020/086263 CN2020086263W WO2020238503A1 WO 2020238503 A1 WO2020238503 A1 WO 2020238503A1 CN 2020086263 W CN2020086263 W CN 2020086263W WO 2020238503 A1 WO2020238503 A1 WO 2020238503A1
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Prior art keywords
demultiplexer
combiner
optical
signal
time
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English (en)
French (fr)
Inventor
吴龟灵
程汉煌
陈建平
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Shanghai Jiao Tong University
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Shanghai Jiao Tong University
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Priority to US17/039,823 priority Critical patent/US11146334B2/en
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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
    • H04B10/2589—Bidirectional transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0272—Transmission of OAMP information
    • H04J14/0275—Transmission of OAMP information using an optical service channel
    • 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
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • 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
    • 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
    • H04B10/29—Repeaters
    • 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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/297—Bidirectional amplification
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/08—Time-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2210/00—Indexing scheme relating to optical transmission systems
    • H04B2210/07—Monitoring an optical transmission system using a supervisory signal
    • H04B2210/078—Monitoring an optical transmission system using a supervisory signal using a separate wavelength

Definitions

  • the present invention relates to the joint transmission of optical fiber time frequency and communication data, in particular to a joint transmission system and method of optical fiber time frequency and communication data for WDM system.
  • High-precision time-frequency reference plays an important supporting role in satellite navigation, precision measurement, geological surveying and mapping, time-frequency system and deep space exploration.
  • time-frequency transmission technologies based on free space channels such as GPS common view and satellite two-way time-frequency comparison, due to the interference of environmental factors on free-space transmission links, the accuracy of time transmission can only reach the order of ns, and the frequency transmission The stability can only reach 10-15 /day, which cannot meet the needs of high-precision time-frequency transmission and synchronization.
  • Optical fiber transmission has the advantages of low loss, large capacity, and high reliability, and has been widely used in the field of communications.
  • the use of dedicated optical fiber links can achieve high-precision time and frequency transmission and synchronization, but the cost of laying or renting dedicated optical fiber links is very high, which severely limits the application of large-scale, large-scale high-precision time and frequency transmission.
  • Optical fiber time-frequency transmission through the existing widely distributed optical fiber communication network can greatly save costs and is an ideal choice for realizing high-precision and wide-range optical fiber time-frequency transmission.
  • NTP network time protocol
  • PTP precision time protocol
  • NTP and PTP are time synchronization technologies widely used in existing networks [Refer to Document 1: Eidson, John, and Kang Lee.”IEEE 1588 standard for a precise clock synchronization protocol for networked measurement and control systems. "Sensors for Industry Conference, 2002.2nd ISA/IEEE. Ieee, 2002.].
  • the time synchronization accuracy of NTP and PTP can only reach the order of ms and ⁇ s, which cannot meet the demand for high-precision time and frequency transmission.
  • this method uses a special coarse wavelength division multiplexer at each node to separate the OSC band (1500nm-1520nm), optical communication band, 1470nm band (1460nm-1480nm) and 1490nm band from a single access fiber. (1480nm-1500nm).
  • the coarse wavelength division multiplexer is incompatible with CWDM in the existing commercial WDM optical network that can only divide the OSC band (1500nm-1520nm) and the optical communication band. All need to be replaced during implementation.
  • this method occupies the coarse wavelength sub-band that can be used for communication services.
  • wavelength resources are becoming increasingly scarce, and the limitations of this method are becoming more and more obvious.
  • the purpose of the present invention is to provide a fiber time frequency and data joint transmission system and method in view of the above-mentioned deficiencies of the prior art.
  • the system and method use different sub-bands in the standard OSC band in the optical communication network to transmit time and frequency separately
  • the signal and the optical monitoring signal are then combined with the optical communication data service in the same optical fiber through the CWDM module in the commercial WDM optical communication system.
  • An optical fiber time-frequency and data joint transmission system which is characterized in that it includes a local end, a relay section and a remote end.
  • the relay section is composed of n relay nodes connected in series through optical fibers, where n ⁇ 0;
  • the local end of is connected to the first relay node through a first optical fiber, and the nth relay node at the end is connected to the remote end through a second optical fiber;
  • the local terminal includes a local terminal time frequency signal unit, a local terminal optical monitoring signal transmission unit, a local terminal optical communication data unit, a local terminal OSC band combiner/demultiplexer and a local terminal combiner/demultiplexer.
  • the terminal time-frequency signal unit is connected to the demultiplexing terminal 2 of the local OSC band combiner/demultiplexer, and the local optical monitoring signal transmitting unit is connected to the demultiplexing terminal 1 of the local OSC band combiner/demultiplexer.
  • the multiplexer end 3 of the OSC band combiner/demultiplexer is connected to the demultiplexer end 1 of the local end combiner/demultiplexer, and the local end optical communication data unit is connected to the local end combiner/demultiplexer.
  • the wave end 2 is connected, and the multiplexing end 3 of the local end combiner/demultiplexer is connected to one end of the first optical fiber;
  • the relay node includes: a first combiner/demultiplexer, a communication data relay amplifying unit, a first OSC band combiner/demultiplexer, a time-frequency bidirectional relay amplifying unit, an optical monitoring signal receiving unit, and an optical monitoring signal transmitting unit Unit, the second OSC band combiner/demultiplexer and the second combiner/demultiplexer, the multiplexer end 3 of the first combiner/demultiplexer is connected to the other end of the first optical fiber, and the first The demultiplexer terminal 2 of the 1 combiner/demultiplexer is connected to the 1 port of the communication data relay amplifying unit, and the demultiplexer terminal 1 of the first combiner/demultiplexer is connected to the first OSC band combiner/demultiplexer.
  • the multiplexer end 3 of the first OSC band combiner/demultiplexer is connected to the optical monitoring signal receiving unit, and the demultiplexer end 1 of the first OSC band combiner/demultiplexer is connected to the Port 1 of the time-frequency bidirectional relay amplifying unit is connected; Port 2 of the time-frequency bidirectional relay amplifying unit is connected to the demultiplexer 2 of the 2nd OSC band combiner/demultiplexer, and the optical monitoring signal
  • the transmitting unit is connected to the demultiplexer 1 of the 2nd OSC band combiner/demultiplexer, and the multiplexer 3 of the 2nd OSC band combiner/demultiplexer is connected to the demultiplexer of the second OSC band combiner/demultiplexer.
  • the wave terminal 1 is connected, and the 2 ports of the communication data relay amplifying unit are connected to the demultiplexer 2 of the combiner/demultiplexer, and the multiplexer 3 of the second combiner/demultiplexer passes through a
  • the root optical fiber is connected to the multiplexer end 3 of the first combiner/demultiplexer of the next relay node;
  • the n relay amplifying nodes of the relay section are sequentially connected by optical fibers;
  • the multiplexer end 3 of the 2 combiner/demultiplexer is connected to the second optical fiber;
  • the remote terminal includes a remote time frequency signal unit, a remote optical monitoring signal receiving unit, a remote communication data unit, a remote OSC band combiner/demultiplexer and a remote combiner/demultiplexer.
  • the time-frequency signal unit is connected to the demultiplexing terminal 1 of the remote OSC band combiner/demultiplexer
  • the remote optical monitoring signal receiving unit is connected to the demultiplexing terminal 2 of the remote OSC band combiner/demultiplexer.
  • the multiplexer end 3 of the OSC band combiner/demultiplexer is connected to the demultiplexer end 1 of the remote combiner/demultiplexer
  • the remote communication data unit is connected to the demultiplexer end 2 of the remote combiner/demultiplexer.
  • the multiplexer end 3 of the remote multiplexer/demultiplexer is connected to the other end of the second optical fiber.
  • the OSC band adopted by the system is one of the optional OSC bands specified by ITU standard G.692, currently it is 1500nm-1520nm or 1470nm-1490nm or 1310 band, and it can also be a new OSC band specified by future ITU standards; the local end OSC band combiner/demultiplexer, 1st OSC band combiner/demultiplexer, 2nd OSC band combiner/demultiplexer, remote OSC band combiner/demultiplexer work in the selected OSC band to realize the optical monitoring signal wavelength and time The multiplexing/demultiplexing of the wavelength of the frequency transmission signal.
  • the local combiner/demultiplexer, the first combiner/demultiplexer, the second combiner/demultiplexer, and the remote combiner/demultiplexer used in the system are used to realize the OSC band and the local end optical communication data unit and remote communication Multiplexing/demultiplexing of the working light band of the data unit (204).
  • the time-frequency transmission wavelength and optical monitoring signal wavelength used in the system are both in the OSC band, and the working wavelength ranges do not overlap each other.
  • the time-frequency signal and the optical monitoring signal are carried on different optical wavelengths in the OSC band, and the communication data are carried on wavelengths outside the OSC band.
  • the three types of signals are transmitted through a single optical fiber through wavelength division multiplexing.
  • the time-frequency transmission of this method can adopt two-way same fiber and same wave, or two-way same fiber and different wave transmission mode, including the following steps:
  • the transmission of time-frequency signals includes forward transmission and backward transmission:
  • Forward transmission The direction in which time frequency signals are transmitted from the local end to the remote end is forward transmission.
  • the forward time frequency transmission process includes:
  • the local time-frequency signal unit generates a forward time-frequency optical signal with a wavelength of ⁇ 2 ( ⁇ 2 , ⁇ 3 , when the time and frequency are transmitted separately), and the forward time-frequency optical signal passes through the local OSC band Combiner/demultiplexer, local end combiner/demultiplexer (106), transmitted to the first optical fiber;
  • the amplification process of the first relay node is: the first combiner/demultiplexer inputs the optical signal from the first optical fiber to the first OSC band combiner/demultiplexer, and the first OSC band combiner/demultiplexer will come from the first combiner/demultiplexer.
  • the forward time-frequency optical signal of the demultiplexer is input to the time-frequency bidirectional relay amplifying unit, and the time-frequency bidirectional relay amplifying unit performs forward relay amplifying on the received forward time-frequency optical signal.
  • the 2nd OSC band combiner/demultiplexer inputs the forward time-frequency optical signal from the time-frequency bidirectional relay amplifier unit to the second combiner/demultiplexer, which will come from the OSC of the combiner/demultiplexer Band optical signal input and the optical fiber connected to the next relay node;
  • the second relay node repeats the above-mentioned first relay amplification process; ...; the nth relay node repeats the above-mentioned first relay amplification process, the second combiner/demultiplexer will be the OSC from the combiner/demultiplexer
  • the band optical signal is input to the second optical fiber connected to the remote end;
  • the remote multiplexer/demultiplexer receives the forward time frequency optical signal sent by the second optical fiber, and inputs the light of the OSC band to the remote OSC multiplexer/demultiplexer.
  • the remote OSC band The combiner/demultiplexer demultiplexes the forward time-frequency optical signal with wavelength ⁇ 2 ( ⁇ 2 , ⁇ 3 ) from the received optical signal in the OSC band, and inputs it to the remote time-frequency signal unit;
  • the remote time frequency signal unit generates a backward time frequency optical signal with a wavelength of ⁇ ′ 2 ( ⁇ ′ 2 , ⁇ ′ 3 , when the time and frequency are transmitted separately), and the backward time frequency optical signal passes through the remote
  • the OSC band combiner/demultiplexer is input to the remote combiner/demultiplexer, and the remote combiner/demultiplexer (206) inputs the backward time frequency optical signal to the second optical fiber;
  • the second multiplexer/demultiplexer of the relay node inputs the optical signal from the second optical fiber to the second OSC band multiplexer/demultiplexer, and the second OSC band multiplexer/demultiplexer is from the second multiplexer/demultiplexer Demultiplex the backward time-frequency optical signal with wavelength ⁇ ′ 2 ( ⁇ ′ 2 , ⁇ ′ 3 , when the time and frequency are transmitted separately) from the optical signal, and input the backward time-frequency optical signal into the time-frequency bidirectional Relay amplifying unit; the time-frequency bidirectional relay amplifying unit performs relay amplifying processing on the received optical signal, and the first OSC band combiner/demultiplexer inputs the backward time-frequency optical signal from the time-frequency bidirectional relay amplifying unit To the first combiner/demultiplexer, the first combiner/demultiplexer inputs the OSC band optical signal from the first combiner/demultiplexer to the combiner/demultiplexer of the previous node through an optical fiber;
  • the combiner/demultiplexer inputs the OSC band optical signal from the combiner/demultiplexer to the first optical fiber;
  • the local end combiner/demultiplexer at the local end receives the optical signal from the first optical fiber, and inputs the light of the OSC band to the OSC band combiner/demultiplexer; the OSC band combiner/demultiplexer changes the wavelength to ⁇ ′ 2 ( ⁇ ′ 2 , ⁇ ′ 3 , when time and frequency are transmitted separately; ⁇ ′ 2 , ⁇ ′ 3 can be equal to ⁇ 2 , ⁇ 3 )
  • the backward time-frequency optical signal is demultiplexed and input to the local time-frequency signal unit ,
  • the local time frequency signal unit receives the backward time frequency optical signal output from the local OSC band combiner/demultiplexer, and performs time frequency comparison and clock synchronization;
  • the transmission process of the optical monitoring signal includes the following steps:
  • the local optical monitoring signal transmitting unit generates optical monitoring signals with a wavelength in the range of ⁇ 0 to ⁇ 1 , where ⁇ 0 and ⁇ 1 are both in the OSC band, and the range of ⁇ 0 to ⁇ 1 does not include time Frequency transmission wavelength ⁇ 2 , ⁇ 3 ;
  • the optical monitoring signal is input to the local end combiner/demultiplexer through the local end OSC band combiner/demultiplexer, and the local end combiner/demultiplexer will come from the local end OSC band combiner/demultiplexer.
  • the optical signal of the demultiplexer is input to the first optical fiber;
  • the first multiplexer/demultiplexer of the first relay node inputs the optical signal from the first optical fiber to the first OSC band multiplexer/demultiplexer, and the 1st OSC band multiplexer/demultiplexer is from the first multiplexer/demultiplexer From the optical signal, the optical monitoring signal light with a wavelength in the range of ⁇ 0 to ⁇ 1 is demultiplexed and input to the optical monitoring signal receiving unit and the optical monitoring signal transmitting unit (produces the optical monitoring signal with the wavelength in the range of ⁇ 0 ⁇ 1 Input to the 2nd OSC band combiner/demultiplexer, the 2nd OSC band combiner/demultiplexer inputs the optical monitoring signal generated from the optical monitoring signal transmitter unit to the 2nd combiner/demultiplexer, which will
  • the OSC band optical signal input from the 2nd OSC combiner/demultiplexer connects the optical fiber to the lower relay node;
  • the second relay node repeats the above-mentioned first relay amplification process; ...; the nth relay node repeats the above-mentioned first relay amplification process, the second combiner/demultiplexer will be the OSC from the combiner/demultiplexer
  • the band optical signal is input to the second optical fiber connected to the remote end;
  • the remote multiplexer/demultiplexer receives the forward optical signal from the second optical fiber, and inputs the light of the OSC band to the remote OSC multiplexer/demultiplexer, and the remote OSC band multiplexer/demultiplexer
  • the demultiplexer demultiplexes the optical monitoring signal in the range of ⁇ 0 to ⁇ 1 from the received optical signal in the OSC band, and inputs it to the remote optical monitoring signal receiving unit;
  • Communication data signal transmission can be single-fiber unidirectional transmission or single-fiber bidirectional transmission, when it is single-fiber unidirectional transmission
  • the local end optical communication data unit loads the communication data signal on the optical communication data signal band outside the OSC band, and the local end combiner/demultiplexer inputs the optical communication data signal band input via The first optical fiber is input to the first combiner/demultiplexer of the first relay node;
  • the first multiplexer/demultiplexer of the first relay node inputs the optical communication data signal from the first optical fiber to the communication data relay amplifier unit, and the communication data relay amplifier unit receives After processing the optical communication data signal, it is input to the second combiner/demultiplexer, and the output end of the second combiner/demultiplexer inputs the optical communication data signal to the next relay node, that is, the second relay node.
  • the first combiner/demultiplexer of the relay node inputs the optical communication data signal from the first optical fiber to the communication data relay amplifier unit, and the communication data relay amplifier unit receives After processing the optical communication data signal, it is input to the second combiner/demultiplexer, and the output end of the second combiner/demultiplexer inputs the optical communication data signal to the next relay node, that is, the second relay node.
  • the first combiner/demultiplexer of the relay node
  • the second relay amplification repeat the above-mentioned communication data relay amplification process at the second relay node; ...; the nth relay amplification: repeat the above-mentioned communication data relay amplification process at the nth relay node;
  • the remote communication data unit loads the communication data signal on the optical communication data signal band outside the OSC band, and the remote combiner/demultiplexer passes the optical communication data signal band through the second optical fiber and the second combiner.
  • / Demultiplexer input to the communication data relay amplifying unit of the nth relay node;
  • the communication data relay amplifying unit of the nth relay node processes the received optical communication data signal, and then inputs it to the first combiner/demultiplexer, which inverts the optical communication data signal Input to the second combiner/demultiplexer of the next relay node;
  • All relay nodes perform the above-mentioned communication data relay and amplification process in reverse order, and the optical communication data signal is input to the local terminal through the first optical fiber at the first combiner/demultiplexer of the first relay node.
  • the local end combiner/demultiplexer inputs the input optical communication data band signal to the local end optical communication data unit.
  • the ⁇ 2 , ⁇ 3 and ⁇ ′ 2 , ⁇ ′ 3 may be equal.
  • the present invention uses different sub-bands in the standard commercial OSC waveband to respectively transmit time frequency signals and optical monitoring signals, and then multiplexes the CWDM module and optical communication data service into one optical fiber through the CWDM module in the commercial WDM optical communication system to realize the optical fiber time frequency Joint transmission with data services.
  • the main technical effects brought about include:
  • the present invention uses the sub-bands of the standard OSC band to transmit time-frequency signals, which neither affects the transmission of optical monitoring signals nor occupies additional band resources, with higher wavelength resource utilization and lower cost;
  • the time-frequency transmission wavelengths are all located in the sub-bands of the OSC band, which can be flexibly selected and combined to meet the requirements of different applications and systems.
  • the two-way transmission wavelengths can be very close, or even the same, to ensure the two-way symmetry of the link at most, and improve the accuracy of time and frequency transmission.
  • the present invention uses the CWDM module in the commercial WDM optical communication system to realize the multiplexing of time-frequency signals and optical monitoring signals with optical communication data services. There is no need to replace the CWDM in the existing communication link or interrupt the original communication during implementation. Data business is easier to implement and lower cost;
  • Figure 1 is a block diagram of a fiber-optic time-frequency and data joint transmission system.
  • FIG. 2(a) is an OSC band segmentation diagram of Embodiment 1
  • FIG. 2(b) is an OSC band segmentation diagram of Embodiment 2.
  • Embodiment 1 is a schematic structural diagram of Embodiment 1, (a) is a schematic structural diagram of the local end of the system, (b) is a schematic structural diagram of a system relay node, and (c) is a schematic structural diagram of the remote system.
  • the invention relates to the joint transmission of optical fiber time frequency and communication data, in particular to a system and method for joint transmission of optical fiber time frequency and communication data for a WDM system.
  • Figure 1 is a block diagram of a fiber time-frequency and data joint transmission system. It can be seen from the figure that the optical fiber time-frequency and data joint transmission system of the present invention includes a local end 101, a relay section, and a remote end 201.
  • the relay section is composed of n relay nodes 401 connected in series through optical fibers, where n ⁇ 0
  • the local end 101 is connected to the first relay node 401 through a first optical fiber 301, and the nth relay node is connected to the remote 201 through a second optical fiber 303; the local end 101 includes the local end time
  • the unit 102 is connected to the demultiplexing terminal 2 of the local OSC band combiner/demultiplexer 105
  • the local optical monitoring signal transmitting unit 103 is connected to the demultiplexing terminal 1 of the local OSC band combiner/demultiplexer 105.
  • the multiplexer end 3 of the OSC band combiner/demultiplexer 105 is connected to the demultiplexer end 1 of the local end combiner/demultiplexer 106, and the local end optical communication data unit 104 is combined/demultiplexed with the local end
  • the demultiplexing end 2 of the local end combiner/demultiplexer 106 is connected to one end of the first optical fiber 30);
  • the relay node 401 includes: a first combiner/demultiplexer 410, a communication data relay amplifier unit 411, a first OSC band combiner/demultiplexer 407, a time-frequency bidirectional relay amplifier unit 402, and an optical monitoring signal receiving unit 408.
  • the demultiplexing terminal 1 of the 1st OSC band combiner/demultiplexer 407 is connected to the 1 port of the time-frequency bidirectional relay amplifying unit 402; the 2 ports of the time-frequency bidirectional relay amplifying unit 402 are connected to the first
  • the demultiplexing terminal 2 of the 2OSC band combiner/demultiplexer 413 is connected, and the optical monitoring signal transmitting unit 409 is connected to the demultiplexing terminal 1 of the 2nd OSC band combiner/demultiplexer 413, and the 2nd OSC band
  • the multiplexer end 3 of the multiplexer/demultiplexer 413 is connected to the demultiplexer end 1 of the second multiplexer/demultiplexer 412, and the 2 ports of the communication data relay amplifying unit 411 are connected to the multiplexer/demultiplexer unit 411.
  • the demultiplexer end 2 of the multiplexer 412 is connected, and the multiplexer end 3 of the second multiplexer/demultiplexer 412 combines with the first multiplexer/demultiplexer 410 of the next relay node 401 through an optical fiber 302 Terminal 3 is connected; the n relay amplifier nodes 401 of the relay section are sequentially connected by optical fibers; the multiplexer terminal 3 of the second combiner/demultiplexer 412 of the nth relay node is connected to the second Optical fiber 303 connection;
  • the remote end 201 includes a remote time frequency signal unit 202, a remote optical monitoring signal receiving unit 203, a remote communication data unit 204, a remote OSC band combiner/demultiplexer 205, and a remote combiner/demultiplexer 206 ,
  • the remote time-frequency signal unit 202 is connected to the demultiplexer 1 of the remote OSC band combiner/demultiplexer 205
  • the remote optical monitoring signal receiving unit 203 is connected to the remote OSC band combiner/demultiplexer
  • the demultiplexer terminal 2 of 205 is connected, the multiplexer terminal 3 of the remote OSC band combiner/demultiplexer 205 is connected to the demultiplexer terminal 1 of the remote combiner/demultiplexer (206), and the remote communication data unit (204) is connected to
  • the demultiplexer end 2 of the remote combiner/demultiplexer (206) is connected, and the multiplexer end 3 of the remote combiner/demultiplexer 206 is connected to the other end of the second optical fiber 303
  • the OSC band adopted by the system is one of the optional OSC bands specified by ITU standard G.692, currently it is 1500nm-1520nm or 1470nm-1490nm or 1310 band, and it can also be a new OSC band specified by future ITU standards; the local end
  • the OSC band combiner/demultiplexer 105, the 1st OSC band combiner/demultiplexer 407, the 2nd OSC band combiner/demultiplexer 413, and the remote OSC band combiner/demultiplexer 205 work in the selected OSC band to realize optical monitoring Signal wavelength and time frequency transmission signal wavelength multiplexing/demultiplexing.
  • the local combiner/demultiplexer 106, the first combiner/demultiplexer 410, the second combiner/demultiplexer 412, and the remote combiner/demultiplexer 206 used in the system are used to realize the optical communication data between the OSC band and the local end.
  • Unit 104 and the remote communication data unit 20) combine/demultiplex the working light band.
  • the time-frequency transmission wavelength and optical monitoring signal wavelength used in the system are both in the OSC band, and the working wavelength ranges do not overlap each other.
  • the time-frequency signal and the optical monitoring signal are carried on different optical wavelengths in the OSC band, and the communication data are carried on wavelengths outside the OSC band.
  • the three types of signals are transmitted through a single optical fiber through wavelength division multiplexing.
  • the time-frequency and data joint transmission method of the above-mentioned optical fiber time-frequency and data joint transmission system is characterized in that the time-frequency transmission of this method can adopt two-way same fiber and same wave, or two-way same fiber and different wave transmission mode, including the following step:
  • the transmission of time-frequency signals includes forward transmission and backward transmission:
  • Forward transmission The direction in which time frequency signals are transmitted from the local end to the remote end is forward transmission.
  • the forward time frequency transmission process includes:
  • the local time-frequency signal unit 102 generates a forward time-frequency optical signal with wavelength ⁇ 2 ( ⁇ 2 , ⁇ 3 , when the time and frequency are transmitted separately), and the forward time-frequency optical signal passes through the local OSC
  • the band combiner/demultiplexer 105 and the local end combiner/demultiplexer 106 are transmitted to the first optical fiber (301);
  • the amplification process of the first relay node is as follows: the first combiner/demultiplexer 410 inputs the optical signal from the first optical fiber 301 to the first OSC band combiner/demultiplexer 407, and the 1st OSC band combiner/demultiplexer 407 will come from The forward time frequency optical signal of the first combiner/demultiplexer 410 is input to the time frequency bidirectional relay amplifying unit 402, and the time frequency bidirectional relay amplifying unit 402 forwards the received forward time frequency optical signal.
  • the second OSC band combiner/demultiplexer 413 inputs the forward time-frequency optical signal from the time-frequency bidirectional relay amplifying unit 402 to the second combiner/demultiplexer 412, and the second multiplexer/demultiplexer 412
  • the device 412 inputs the OSC band optical signal from the combiner/demultiplexer 413 into the optical fiber connected to the next relay node;
  • the second relay node repeats the above-mentioned first relay amplification process; ...; the nth relay node repeats the above-mentioned first relay amplification process, and the second combiner/demultiplexer 412 of the nth relay node comes from the combiner/demultiplexer
  • the OSC band optical signal of the wave device 413 is input to the second optical fiber 303 connected to the remote end;
  • the remote multiplexer/demultiplexer 206 receives the forward time-frequency optical signal sent by the second optical fiber 303, and inputs the light of the OSC band to the remote OSC multiplexer/demultiplexer 205.
  • the end OSC band combiner/demultiplexer 205 demultiplexes the forward time frequency optical signal with a wavelength of ⁇ 2 ( ⁇ 2 , ⁇ 3 ) from the received optical signal in the OSC band, and inputs it to the remote time frequency signal unit 202;
  • the remote time-frequency signal unit 202 generates a backward time-frequency optical signal with a wavelength of ⁇ ′ 2 ( ⁇ ′ 2 , ⁇ ′ 3 , when the time and frequency are transmitted separately).
  • the end OSC band combiner/demultiplexer 205 is input to the remote combiner/demultiplexer 206, and the remote combiner/demultiplexer 206 inputs the backward time frequency optical signal to the second optical fiber 303;
  • the second multiplexer/demultiplexer 412 of the nth relay node inputs the optical signal from the second optical fiber 303 to the 2nd OSC band multiplexer/demultiplexer 413, and the 2nd OSC band multiplexer/demultiplexer 41) from The optical signal of the second combiner/demultiplexer 412 demultiplexes a backward time frequency optical signal with a wavelength of ⁇ ′ 2 ( ⁇ ′ 2 , ⁇ ′ 3 , when the time and frequency are transmitted separately), and divides the backward time frequency
  • the optical signal is input to the time-frequency two-way relay amplifier unit 402; the time-frequency two-way relay amplifier unit 402 relays and amplifies the received optical signal, and the first OSC band combiner/demultiplexer 407 will come from the time-frequency two-way intermediate
  • the backward time-frequency optical signal from the amplifying unit (402) is input to the first combiner/demultiplexer 410, which transmits the OSC band from the first combiner/demultiplex
  • the combiner/demultiplexer 410 inputs the OSC band optical signal from the combiner/demultiplexer 407 to the first An optical fiber 301;
  • the local end combiner/demultiplexer 106 receives the optical signal from the first optical fiber 301, and inputs the OSC band light to the OSC band combiner/demultiplexer 105; the OSC band combiner/demultiplexer 105 changes the wavelength to ⁇ ′ 2 ( ⁇ ′ 2 , ⁇ ′ 3 , when time and frequency are transmitted separately; ⁇ ′ 2 , ⁇ ′ 3 can be equal to ⁇ 2 , ⁇ 3 ) backward time frequency optical signal demultiplexed and input to the local time frequency
  • the signal unit 102, the local time-frequency signal unit 102 receives the backward time-frequency optical signal output from the local OSC band combiner/demultiplexer 105, and performs time-frequency comparison and clock synchronization;
  • the transmission process of the optical monitoring signal includes the following steps:
  • the local optical monitoring signal transmitting unit 103 generates an optical monitoring signal with a wavelength in the range of ⁇ 0 ⁇ 1 , where ⁇ 0 , ⁇ 1 are both in the OSC band, and the range of ⁇ 0 ⁇ 1 does not include Time and frequency transfer wavelength ⁇ 2 , ⁇ 3 ; the optical monitoring signal is input to the local end combiner/demultiplexer 106 through the local end OSC band combiner/demultiplexer 105, and the local end combiner/demultiplexer 106 will come from the local The optical signal of the OSC band combiner/demultiplexer 105 is input to the first optical fiber 301);
  • the first multiplexer/demultiplexer 410 of the first relay node 401 inputs the optical signal from the first optical fiber 301 to the first OSC band multiplexer/demultiplexer 407, and the first OSC band multiplexer/demultiplexer 407 from the first
  • the optical signal of the combiner/demultiplexer 410 demultiplexes the optical monitoring signal light with a wavelength in the range of ⁇ 0 ⁇ 1 and inputs it to the optical monitoring signal receiving unit 408.
  • the optical monitoring signal transmitting unit 409 generates the wavelength at ⁇ 0 ⁇ .
  • the optical monitor signal within the range of 1 is input to the 2nd OSC band combiner/demultiplexer 413, and the 2nd OSC band combiner/demultiplexer 413 inputs the optical monitor signal generated from the optical monitor signal transmitting unit 409 to the second multiplexer/demultiplexer 412.
  • the second combiner/demultiplexer 412 inputs the OSC band optical signal from the second OSC combiner/demultiplexer 413 and connects the optical fiber to the lower relay node 401;
  • the second relay node repeats the above-mentioned first relay amplification process; ...; the nth relay node repeats the above-mentioned first relay amplification process, and the second combiner/demultiplexer 412 of the nth relay node will come from the combiner/demultiplexer
  • the OSC band optical signal of the wave device 413 is input to the second optical fiber 303 connected to the remote end;
  • the remote multiplexer/demultiplexer 206 receives the forward optical signal sent by the second optical fiber 303, and inputs the OSC band light to the remote OSC-band multiplexer/demultiplexer 205.
  • the remote OSC The band combiner/demultiplexer 205 demultiplexes the optical monitoring signal in the range of ⁇ 0 to ⁇ 1 from the received optical signal in the OSC band, and inputs it to the remote optical monitoring signal receiving unit 203;
  • Communication data signal transmission can be single-fiber unidirectional transmission or single-fiber bidirectional transmission, when it is single-fiber unidirectional transmission
  • the local end optical communication data unit 104 loads the communication data signal on the optical communication data signal band outside the OSC band, and the local end combiner/demultiplexer 106 transfers the optical communication data signal band Input the first combiner/demultiplexer 410 of the first relay node via the first optical fiber 301;
  • the first multiplexer/demultiplexer 410 of the first relay node inputs the optical communication data signal from the first optical fiber 301 to the communication data relay amplifying unit 411, which is 411 After processing the received optical communication data signal, it is input to the second combiner/demultiplexer 412, and the output end of the second combiner/demultiplexer 412 inputs the optical communication data signal to the next
  • the relay node is the first combiner/demultiplexer 410 of the second relay node;
  • the second relay amplification repeat the communication data relay amplification process of the first relay amplification at the second relay node; ...; the nth relay amplification: repeat the above first relay amplification at the nth relay node Communication data relay amplification process;
  • the remote communication data unit 204 loads the communication data signal on the optical communication data signal band outside the OSC band, and the remote multiplexer/demultiplexer 206 passes the optical communication data signal band through the second optical fiber 303,
  • the second combiner/demultiplexer 412 inputs the communication data relay amplifying unit 411 of the nth relay node;
  • the communication data relay amplifying unit 411 of the nth relay node processes the received optical communication data signal, and then inputs it to the first multiplexer/demultiplexer 410, and the first multiplexer/demultiplexer 410 performs optical communication
  • the data signal is reversely input to the second combiner/demultiplexer 412 of the next relay node;
  • All relay nodes perform the above-mentioned communication data relay and amplification process in reverse order, and the optical communication data signal is input to the local terminal through the first optical fiber 301 at the first combiner/demultiplexer 410 of the first relay node.
  • the demultiplexer 106, the local end combiner/demultiplexer 106 inputs the input signal of the optical communication data band to the local end optical communication data unit 104.
  • the ⁇ 2 , ⁇ 3 and ⁇ ′ 2 , ⁇ ′ 3 may be equal.
  • Embodiment 1 there is only one relay node, but there may be multiple or zero relay nodes.
  • This embodiment uses wavelengths in the OSC band that are not covered by the commercial optical monitoring signal sending optical module to transmit the bidirectional time signal.
  • the division of the OSC band is shown in Figure 2(a).
  • 1500nm-1520nm is one of the optional OSC bands specified by ITU standard G.692.
  • the wavelength of the optical monitoring signal is in the 1503.5nm-1516.5nm sub-band.
  • This sub-band (1503.5nm-1516.5nm) coincides with the working wavelength range of most existing commercial optical monitoring signal sending optical modules.
  • Both the forward time signal and the backward time signal are carried by the 1511nm CWDM module (that is, the local combiner/demultiplexer 106, the first combiner/demultiplexer 410, the second combiner/demultiplexer 412, and the remote combiner/demultiplexer 206)
  • the working wavelength range (the standard is 1503.5nm-1518.5nm) is not covered by the optical monitoring signal sub-band (1503.5nm-1516.5nm) at a wavelength of 1517nm.
  • the two-way time division multiplexing is realized through the same fiber and the same wave two-way time division multiplexing. transmission.
  • the communication data signal wavelength is in the C-band (1530nm-1565nm).
  • FIG 3 (a) is a schematic diagram of the local end of the optical fiber time and data joint transmission system in Embodiment 1.
  • the local terminal 101 includes: a local terminal time signal unit 102, an optical monitoring signal transmitting unit 103, a local terminal optical communication data unit 104, a local terminal OSC band combiner/demultiplexer 105, and a local terminal combiner/demultiplexer 106.
  • the local time signal unit 102 includes a transmitting unit 502, a receiving unit 503, and a circulator 504.
  • the transmitting unit 502 of the local time signal unit 102 is connected to port 1 of the circulator 50), the receiving unit 503 is connected to port 2 of the circulator 504, and the 3 port of the circulator 504 is connected to the demultiplexing terminal of the OSC band combiner/demultiplexer 105 2 connected.
  • the optical monitoring signal transmitting unit 103 is connected to the demultiplexing terminal 1 of the OSC band combiner/demultiplexer 105, the multiplexing terminal 3 of the OSC band combiner/demultiplexer 105 and the demultiplexing terminal 1 of the local terminal combiner/demultiplexer 106 (working wavelength The range is 1503.5nm-1518.5nm), and the local optical communication data unit 104 is connected to the demultiplexer 2 (the working wavelength range is C-band) of the local multiplexer/demultiplexer 106.
  • the multiplexer end 3 of the local end combiner/demultiplexer 106 is connected to the first optical fiber 301.
  • the local OSC band combiner/demultiplexer 105 is used to combine the optical monitoring signal of 1503.5nm-1516.5nm with the forward time signal of 1517nm wavelength, and it is also used to combine the backward time signal of 1517nm wavelength from the OSC wave band. separate it.
  • the local end combiner/demultiplexer 106 is used to combine and demultiplex the optical signal in the OSC band and the communication data signal in the C band.
  • the transmitting unit 502 of the local time signal unit 102 generates a forward time optical signal with a wavelength of 1517 nm, and the transmitting unit 502 stops transmitting the optical signal after completing the forward time optical signal with a wavelength of 1517 nm.
  • the forward time optical signal is input to the local OSC band combiner/demultiplexer 105 through the circulator 504.
  • the optical monitoring signal transmitting unit 103 at the local end generates an optical monitoring signal with a wavelength in the range of 1503.5 nm-1516.5 nm, and inputs it to the local end OSC band combiner/demultiplexer 105.
  • the local OSC band combiner/demultiplexer 105 multiplexes the forward time optical signal from the circulator 504 and the optical monitor signal from the optical monitor signal transmission unit 103 and inputs it to the local combiner/demultiplexer 106.
  • the local optical communication data unit 104 loads the communication data signal on the C-band and inputs it to the local combiner/demultiplexer 106.
  • the local end combiner/demultiplexer 106 combines the optical signal from the local end OSC band combiner/demultiplexer 105 and the communication data signal from the local end optical communication data unit 104 into the first optical fiber 301.
  • the local end combiner/demultiplexer 106 of the local end 101 receives the backward optical signal from the first optical fiber 301, and the local end combiner/demultiplexer 106 demultiplexes the backward optical signal in the OSC band and inputs it to the combiner/demultiplexer 105.
  • the combiner/demultiplexer 105 demultiplexes the backward time optical signal with a wavelength of 1517 nm and inputs it to the circulator 504, and the circulator 504 inputs the backward time optical signal to the receiving unit 503 of the local time signal unit 102.
  • the receiving unit 503 receives a backward time optical signal with a wavelength of 1517 nm, and performs time comparison and clock synchronization.
  • Fig. 3(b) is a schematic diagram of the structure of a relay node of the optical fiber time and data joint transmission system in Embodiment 1.
  • the relay node 401 includes: a first combiner/demultiplexer 410, an optical amplifier 411, a first OSC band combiner/demultiplexer 407, a two-way relay amplifying unit 402, an optical monitoring signal receiving unit 408, an optical monitoring signal transmitting unit 409, The 2nd OSC band combiner/demultiplexer 413 and the second OSC band combiner/demultiplexer 412.
  • the optical amplifier 411 is a C-band unidirectional optical amplifier, and unidirectionally amplifies the C-band optical communication data transmitted in the forward direction.
  • the optical amplifier 411 may also be a C-band bidirectional optical amplifier, which supports the same fiber bidirectional data transmission.
  • the two-way relay amplifying unit 402 adopts a single-fiber two-way relay and optical amplifier for optical time transfer [see Wu Guiling, Zhang Hao, Chen Jianping, "High-precision optical fiber time transfer two-way optical amplification method and device," application number CN201610073321.3, 2016.6; See Wu Guiling, Zuo Faxing, Chen Jianping, "High-precision and wide-range optical fiber time transfer method and system," application number: CN201811440812.2, 2018.11.], support the same fiber and same wave two-way time division multiplexing transmission.
  • the 1st OSC band combiner/demultiplexer 407 and the 2nd OSC band combiner/demultiplexer 413 are used to combine and demultiplex the optical monitoring signal of 1503.5nm-1516.5nm with the forward time signal of 1517nm wavelength.
  • the backward time signal with a wavelength of 1517 nm is separated from the OSC band.
  • the first combiner/demultiplexer 410 and the second combiner/demultiplexer 412 are used to combine and demultiplex the optical signal in the OSC band and the communication data signal in the C band.
  • the working wavelength range of the 1-port of the first combiner/demultiplexer 410 and the second combiner/demultiplexer 412 is 1503.5nm-1518.5nm, and the working wavelength range of the 2-port is C-band.
  • the optical signal from the first optical fiber 301 is divided into an optical signal in the OSC band and an optical signal in the C band by the first multiplexer/demultiplexer 410 of the relay node 401.
  • the optical signal in the OSC band is split by the first OSC band combiner/demultiplexer 407 to split a forward time optical signal with a wavelength of 1517 nm and an optical monitoring signal with a wavelength in the range of 1503.5 nm to 1516.5 nm.
  • the forward time optical signal with a wavelength of 1517 nm is input to the two-way relay amplifying unit 402 to be relayed and amplified, and then input to the 2nd OSC band combiner/demultiplexer 413.
  • the optical monitoring signal with a wavelength in the range of 1503.5 nm-1516.5 nm is input to the optical monitoring signal receiving unit 408 for processing.
  • the optical monitoring signal transmitting unit (409) generates an optical monitoring signal with a wavelength in the range of 1503.5nm-1516.5nm and inputs it to the 2nd OSC band combiner/demultiplexer 413.
  • the second OSC band combiner/demultiplexer 413 multiplexes the forward time optical signal from the bidirectional relay amplifying unit 402 and the optical monitor signal from the optical monitor signal transmitting unit 409 and inputs it to the second combiner/demultiplexer 412.
  • the C-band optical communication data signal wavelength-divided by the first multiplexer/demultiplexer 410 is optically amplified by the optical amplifier 411, and then input to the second multiplexer/demultiplexer 412.
  • the second multiplexer/demultiplexer 412 multiplexes the OSC band optical signal from the multiplexer/demultiplexer (413) and the optical communication data signal from the optical amplifier 411 into the second optical fiber 303.
  • the optical signal from the second optical fiber 303 passes through the second multiplexer/demultiplexer 412 of the relay node 401 to demultiplex the optical signal in the OSC band, and is input to the second OSC multiplexer/demultiplexer 413.
  • the 2nd OSC band combiner/demultiplexer 413 demultiplexes the backward time optical signal with a wavelength of 1517nm from the optical signal from the second multiplexer/demultiplexer 412, and inputs the backward time optical signal to the bidirectional relay amplifier unit 402.
  • the bidirectional relay amplifying unit 402 performs a backward relay amplifying process on the received backward time optical signal with a wavelength of 1517 nm, and inputs it to the first OSC band combiner/demultiplexer 407.
  • the 1st OSC band combiner/demultiplexer 407 inputs the backward time optical signal from the two-way relay amplifying unit 402 to the first combiner/demultiplexer 410, and the first combiner/demultiplexer 410 comes from the combiner/demultiplexer 407
  • the OSC band optical signal is input to the first optical fiber 301.
  • FIG. 3(c) is a schematic diagram of the remote structure of the optical fiber time and data joint transmission system in this embodiment.
  • the remote 201 includes: a remote time signal unit 202, a remote optical monitoring signal receiving unit 203, a remote communication data unit 204, a remote combiner/demultiplexer 206, and a remote OSC band combiner/demultiplexer 205.
  • the remote time signal unit 202 includes a transmitting unit 512, a receiving unit 513, and a circulator 514.
  • the transmitting unit 512 in the remote time signal unit 202 is connected to the 1 port of the circulator 514, the receiving unit 513 is connected to the 2 port of the circulator 514, and the 2 port of the circulator 514 is connected to the remote OSC band combiner/demultiplexer 205.
  • the sub-wave end 1 is connected.
  • the remote optical monitoring signal receiving unit 203 is connected to the demultiplexing terminal 2 of the remote OSC band combiner/demultiplexer 205.
  • the multiplexer end 3 of the remote OSC band combiner/demultiplexer 205 is connected to the demultiplexer end 1 of the remote multiplexer/demultiplexer 206 (working wavelength range is 1503.5nm-1518.5nm), and the remote communication data unit 204 is connected to the remote The demultiplexing end 2 (the working wavelength range is C-band) of the end combiner/demultiplexer 206 is connected.
  • the multiplexer end 3 of the remote multiplexer/demultiplexer 206 is connected to the second optical fiber 303.
  • the remote OSC band combiner/demultiplexer 205 is used to split the optical monitoring signal of 1503.5nm-1516.5nm and the forward time signal of 1517nm wavelength, and it is also used to multiplex the backward time signal of 1517nm wavelength to the OSC band in.
  • the remote combiner/demultiplexer 206 is used to combine and demultiplex the optical signal in the OSC band and the communication data signal in the C band.
  • the forward optical signal from the second optical fiber 303 passes through the remote multiplexer/demultiplexer 206 of the remote node into a forward optical signal in the OSC band and a communication data signal in the C band.
  • the OSC band optical signal from the remote combiner/demultiplexer 206 is divided by the remote OSC band combiner/demultiplexer 205 to a forward time optical signal with a wavelength of 1517nm and an optical monitor with a wavelength in the range of 1503.5nm-1516.5nm signal.
  • the forward time optical signal from the combiner/demultiplexer 205 is input to the receiving unit 513 of the remote time signal unit 202 via the circulator 514, and the receiving unit 513 processes the received forward time optical signal with a wavelength of 1517 nm.
  • the optical monitoring signal from the combiner/demultiplexer 205 is input to the remote optical monitoring signal receiving unit 203, and the remote optical monitoring signal receiving unit 203 processes the received optical monitoring signal with a wavelength in the range of 1503.5nm-1516.5nm.
  • the C-band communication data signal from the remote combiner/demultiplexer 206 is input to the remote communication data unit 204, and the remote communication data unit 204 processes the received communication data signal.
  • the transmitting unit 513 After the receiving unit 513 receives a forward time optical signal with a wavelength of 1517 nm, after a delay (to ensure that there are no forward time signals and backward time signals with a wavelength of 1517 nm on the fiber link at the same time), the transmitting unit 513 generates A backward time optical signal with a wavelength of 1517 nm.
  • the backward time signal is input to the remote OSC band combiner/demultiplexer 205 through the circulator 514, and the remote OSC band combiner/demultiplexer 205 inputs the backward time signal with a wavelength of 1517nm to the remote combiner/demultiplexer 206 .
  • the remote combiner/demultiplexer 206 inputs the backward time signal to the second optical fiber 303.
  • the wavelength carrying the time signal is 1517 nm, but it can also be any wavelength in the OSC band other than the range of 1503.5 nm to 1516.5 nm, such as 1518 nm, 1519 nm, etc.
  • both the forward time signal and the backward time signal are carried at a wavelength of 1517 nm, that is, the same fiber and the same wave two-way time division multiplexing method is used to transmit the time signal.
  • the forward time signal and the backward time signal can also be carried at any different wavelength in the OSC band except the 1503.5nm-1516.5nm band.
  • the forward time signal is carried at the wavelength of 1518nm
  • the backward time signal is carried at the wavelength of 1519nm.
  • the two-way wavelength division multiplexing method of the same fiber and different waves transmits time signals.
  • the wavelengths in the OSC band that are not covered by the commercial optical monitoring signal sending optical module can also be used for frequency signal transmission, or joint transmission of time and frequency signals.
  • the division of the OSC band is shown in Figure 2(b).
  • 1500nm-1520nm is one of the OSC bands specified by ITU standard G.692
  • 1503.5nm-1516.5nm is the wavelength range of the existing commercial optical monitoring signal optical transmitting module.
  • the wavelength of the optical monitoring signal is in the range of 1506.5nm-1513.5nm, which is smaller than the wavelength range of 1503.5nm-1516.5nm of most existing commercial optical monitoring signal transmitting optical modules.
  • the forward time signal and the backward time signal are carried by the 1511nm CWDM module (that is, the local end combiner/demultiplexer 106, the first combiner/demultiplexer 410, the second combiner/demultiplexer 412, and the remote combiner/demultiplexer 206)
  • the working wavelength range (the standard is 1503.5nm-1518.5nm) is not covered by the optical monitoring signal wavelength range (1506.5nm-1513.5nm) at a wavelength of 1515nm, and bidirectional transmission is realized through the same fiber and same wave bidirectional time division multiplexing.
  • the communication data signal is carried in the C-band (1530nm-1565nm) wavelength.
  • the wavelength of the optical monitoring signal is further restricted to a smaller range (1506.5nm-1513.5nm) , Increase the range of optional wavelengths for time-frequency signal transmission. Therefore, when the CWDM channel bandwidth is small, the time-frequency signal can also obtain the usable wavelength.
  • the composition and connection of the optical fiber time and data joint transmission system are the same as in the first embodiment.
  • the only difference is that the local OSC band combiner/demultiplexer 105, the 1st OSC band combiner/demultiplexer 407, the 2nd OSC band combiner/demultiplexer 413, and the remote OSC band combiner/demultiplexer 205 can convert the wavelength to
  • the optical monitoring signal in the range of 1506.5nm-1513.5nm is combined with the forward time signal with a wavelength of 1515nm, and the backward time signal with a wavelength of 1515nm can also be demultiplexed from the OSC band.
  • the optical fiber time and data joint transmission method of this embodiment is the same as that of Embodiment 1, except that the forward time signal and the backward time signal are carried at a wavelength of 1515nm, and the optical monitoring signal is carried at a wavelength of 1506.5nm-1513.5nm.
  • the wavelength of the time signal is 1515 nm, but it can also be any OSC wavelength band other than the 1506.5 nm-1513.5 nm band, such as 1516 nm.
  • the wavelength carrying the optical monitoring signal is 1506.5nm-1513.5nm, but it can also be 1505.5nm-1514.5nm, etc., as long as the wavelength range of the carrying optical monitoring signal is smaller than the wavelength range of the commercial optical monitoring signal optical module (1503.5nm-1516.5nm ), and leave the available band for the time signal.

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Abstract

一种光纤时间频率和数据联合传输系统和方法，系统包括本地端、中继节点和远端。本地端、中继节点和远端均通过CWDM模块及OSC波段合/分波器实现时间频率信号、光监控信号，以及光通信数据业务的分波和合波，并通过各自对应的处理模块实现发送、中继和接收等处理，实现联合传输。本发明利用OSC波段的子波段来传输时间频率信号，既不影响光监控信号的传输又不占用额外的波段资源，波长资源利用率更高、成本更低。同时，双向时间频率传输的波长都在OSC波段的子波段内，可灵活选择和组合，满足不同应用和系统需求，可以非常接近，甚至相同，从而最大限度保证链路的双向对称性，提高时间频率传递的精度。

Description

光纤时间频率和数据联合传输系统和方法 技术领域
本发明涉及光纤时间频率和通信数据联合传输，特别是一种用于WDM系统的光纤时间频率和通信数据联合传输系统和方法。
背景技术
高精度的时间频率基准在卫星导航、精密测量、地质测绘、时间频率体系和深空探测等领域发挥着重要的支撑保障作用。目前基于自由空间信道的时间频率传输技术，如GPS共视、卫星双向时间频率比对，由于受环境因素对自由空间传输链路的干扰，时间传输的精度只能达到ns量级，频率传输的稳定度只能达到10 -15/天，无法满足高精度时间频率传递和同步的需求。
光纤传输具有低损耗、大容量、高可靠性等优势，在通信领域已经得到了广泛的应用。采用专用的光纤链路能够实现高精度时间频率传递和同步，但敷设或租赁专用光纤链路的成本都很高，严重限制大规模、大范围高精度时间频率传递的应用。通过现有广泛分布的光纤通信网络进行光纤时间频率传输可大大节约成本，是实现高精度大范围光纤时间频率传输的理想选择。NTP(network time protocol)和PTP(precision time protocol)是现有网络中广泛使用的时间同步技术[参见文献1：Eidson,John,and Kang Lee."IEEE 1588standard for a precision clock synchronization protocol for networked measurement and control systems."Sensors for Industry Conference,2002.2nd ISA/IEEE.Ieee,2002.]。但是NTP和PTP的时间同步精度只能达到ms和μs量级，不能满足高精度时间频率传递的需求。2016年RJMWNuijts等人提出了一种将双向时间频率信号分别承载于1470nm波段(1460nm-1480nm)和1490nm波段(1480nm-1500nm)，并通过粗波分复用与光监控信道和通信波长在一根光纤中传输的网络同步和频率发布系统与方法[参见文献2：Nuijts,Roeland Johannus Marie Wilhelm,and Jeroen Cornelis Jean Koelemeij."System and method for network synchronization and frequency dissemination."U.S.Patent No.9,331,844.3 May 2016.]。但该方法采用不同粗波分波段的波长来承载前后向时间频率光信号，前后向光传输的波长差很大，会导致严重的前后向传输时延不对称性，限制了时间频率传递的精度且需要复杂的链路标定，对于长距离传输尤为严重。此外，该方法要在每个节点采用专门的粗波分复用器从单根接入光纤中波分出OSC波段(1500nm-1520nm)、光通信波段、1470nm波段(1460nm-1480nm)和1490nm波段(1480nm-1500nm)。该粗波分复用器与现有商用WDM光网络中只能波分出OSC波段(1500nm-1520nm)和光通信波段的CWDM不兼容。实施中需全部替换。这不仅会导致实施成本的增加，而且会引起原有通信业务的中断，对通信运营商和用户业务的影响大。更进一步，该方法占用了可以用于通信业务的粗波分波段，随着通信业务的快速增长，波长资源日益紧张，这种方法的限制越来越明显。
发明内容
本发明的目的在于针对上述现有技术的不足，提供一种光纤时间频率和数据联合传输系统和方法，该系统和方法利用光通信网中的标准OSC波段内不同的子波段来分别传输时间频率信号和光监控信号，再通过商用WDM光通信系统中的CWDM模块实现与光通信数据业务在同一根光纤中的联合传输。
本发明的技术解决方案如下：
一种光纤时间频率和数据联合传输系统，其特点在于包括：本地端、中继段和远端，所述的中继段由n个中继节点通过光纤串联构成，其中n≥0；所述的本地端通过第一光纤与 第1中继节点连接，最末端的第n中继节点通过第二光纤与所述的远端连接；
所述的本地端包括本地端时间频率信号单元、本地端光监控信号发射单元、本地端光通信数据单元、本地端OSC波段合/分波器和本地端合/分波器，所述的本地端时间频率信号单元与本地端OSC波段合/分波器的分波端2相连，所述的本地端光监控信号发射单元与本地端OSC波段合/分器的分波端1相连，所述的OSC波段合/分波器的合波端3与所述的本地端合/分波器的分波端1相连，所述的本地端光通信数据单元与本地端合/分波器的分波端2相连，该本地端合/分波器的合波端3与第一光纤的一端相连；
所述的中继节点包括：第1合/分波器、通信数据中继放大单元、第1OSC波段合/分波器、时间频率双向中继放大单元、光监控信号接收单元、光监控信号发射单元、第2OSC波段合/分波器和第2合/分波器，所述的第1合/分波器的合波端3与所述的第一光纤的另一端相连，所述的第1合/分波器的分波端2与所述的通信数据中继放大单元的1端口相连，第1合/分波器的分波端1与所述的第1OSC波段合/分波器的合波端3相连，该第1OSC波段合/分波器的分波端2与所述的光监控信号接收单元相连，该第1OSC波段合/分波器的分波端1与所述的时间频率双向中继放大单元的1端口相连；所述的时间频率双向中继放大单元的2端口与所述的第2OSC波段合/分波器的分波端2相连，所述的光监控信号发射单元与所述的第2OSC波段合/分波器的分波端1相连，所述的第2OSC波段合/分波器的合波端3与所述的第2合/分波器的分波端1相连，所述的通信数据中继放大单元的2端口与所述的合/分波器的分波端2相连，所述的第2合/分波器的合波端3通过一根光纤与下一个中继节点的第1合/分波器的合波端3相连；所述的中继段的n个中继放大节点依次通过光纤依次相连；第n个中继节点的第2合/分波器的合波端3与所述的第二光纤相连；
所述的远端包括远端时间频率信号单元、远端光监控信号接收单元、远端通信数据单元、远端OSC波段合/分波器和远端合/分波器，所述的远端时间频率信号单元与远端OSC波段合/分波器的分波端1相连，所述的远端光监控信号接收单元与远端OSC波段合/分波器的分波端2相连，远端OSC波段合/分波器的合波端3与远端合/分波器的分波端1相连，远端通信数据单元与远端合/分波器的分波端2相连，所述的远端合/分波器的合波端3与第二光纤的另一端相连。
系统采用的OSC波段为ITU标准G.692规定的可选OSC波段之一，目前为1500nm-1520nm或1470nm-1490nm或1310波段，也可以是未来ITU标准规定新的OSC波段；所述的本地端OSC波段合/分波器、第1OSC波段合/分波器、第2OSC波段合/分波器、远端OSC波段合/分波器工作于选定的OSC波段，实现光监控信号波长和时间频率传输信号波长的合波/分波。
系统中采用的本地端合/分波器、第1合/分波器、第2合/分波器、远端合/分波器用于实现OSC波段与本地端光通信数据单元、远端通信数据单元(204)的工作光波段的合波/分波。
系统中采用的时间频率传输波长和光监控信号波长都位于OSC波段，且可工作的波长范围互不重叠。
所述的时间频率信号和光监控信号承载于OSC波段中不同的光波长，通信数据承载于OSC波段之外的波长上，所述3种信号通过波分复用经过一根光纤传输。
利用上述光纤时间频率和数据联合传输系统的时间频率和数据联合传输方法，该方法的时间频率传输既可采用双向同纤同波，也可采用双向同纤不同波传输方式，包括下列步骤：
一)时间频率信号的传输包括前向传输和后向传输：
1)前向传输：时间频率信号从本地端传输到远端的方向为前向传输，前向时间频率传输过程包括：
a)所述的本地端时间频率信号单元产生波长为λ 2(λ 2、λ 3，当时间频率分开传输时)的前向时间频率光信号，该前向时间频率光信号经过本地端OSC波段合/分波器、本地端合/分波 器(106)、传输到所述的第一光纤上；
b)中继放大过程：
第1中继节点的放大过程为：第1合/分波器将来自第一光纤的光信号输入第1OSC波段合/分波器，该第1OSC波段合/分波器将来自第1合/分波器的前向时间频率光信号输入所述的时间频率双向中继放大单元，该时间频率双向中继放大单元对接收到的前向时间频率光信号进行前向中继放大，所述的第2OSC波段合/分波器将来自时间频率双向中继放大单元的前向时间频率光信号输入第2合/分波器，该第2合/分波器将来自合/分波器的OSC波段光信号输入与下一个中继节点连接的光纤；
第2中继节点重复上述第1中继放大过程；……；第n中继节点重复上述第1中继放大过程，所述的第2合/分波器将来自合/分波器的OSC波段光信号输入到连接远端的第二光纤；
c)所述的远端合/分波器接收到第二光纤发来的前向时间频率光信号，并将OSC波段的光输入到远端OSC波段合/分波器，该远端OSC波段合/分波器从接收到的OSC波段的光信号中分波出波长为λ 2(λ 2、λ 3)的前向时间频率光信号，并输入到远端时间频率信号单元；
2)后向时间频率传输过程为(时间频率信号从远端传输到本地端的方向为后向)：
a)所述的远端时间频率信号单元产生波长为λ′ 2(λ′ 2、λ′ 3，当时间频率分开传输时)的后向时间频率光信号，后向时间频率光信号经过远端OSC波段合/分波器输入到远端合/分波器，该远端合/分波器(206)将后向时间频率光信号输入到第二光纤上；
b)中继节点的第2合/分波器将来自第二光纤的光信号输入到第2OSC波段合/分波器，该第2OSC波段合/分波器从来自第2合/分波器的光信号中分波出波长为λ′ 2(λ′ 2、λ′ 3，当时间频率分开传输时)的后向时间频率光信号，并将后向时间频率光信号输入到时间频率双向中继放大单元；时间频率双向中继放大单元对接收到光信号进行中继放大处理，所述的第1OSC波段合/分波器将来自时间频率双向中继放大单元的后向时间频率光信号输入到第1合/分波器，该第1合/分波器通过一根光纤将来自第1合/分波器的OSC波段光信号输入到上一个节点的合/分波器；
重复n次(n≥0)上述的中继放大过程，在最前端的中继节点中，所述的合/分波器将来自合/分波器的OSC波段光信号输入到第一光纤；
c)本地端的本地端合/分波器接收到来自第一光纤的光信号，并将OSC波段的光输入到OSC波段合/分波器；OSC波段合/分波器将波长为λ′ 2(λ′ 2、λ′ 3，当时间频率分开传输时；λ′ 2、λ′ 3可以等于λ 2、λ 3)的后向时间频率光信号解复用并输入到本地端时间频率信号单元，本地端时间频率信号单元接收到从本地端OSC波段合/分波器输出的后向时间频率光信号，进行时间频率比对和时钟同步；
二)光监控信号的传输过程，包括下列步骤：
1)所述的本地端光监控信号发射单元产生波长在λ 0～λ 1范围内的光监控信号，其中，λ 0,λ 1均在OSC波段内，且λ 0～λ 1范围不包含时间频率传递波长λ 2,λ 3；所述的光监控信号经本地端OSC波段合/分波器输入到本地端合/分波器，该本地端合/分波器将来自本地端OSC波段合/分波器的光信号输入到第一光纤上；
2)光监控信号的中继放大过程为：
第1中继节点的第1合/分波器将来自第一光纤的光信号输入到第1OSC波段合/分波器，该第1OSC波段合/分波器从来自第1合/分波器的光信号中分波出波长在λ 0～λ 1范围的光监控信号光，并输入到光监控信号接收单元，光监控信号发射单元(产生波长在λ 0～λ 1范围内的光监控信号输入到第2OSC波段合/分波器，第2OSC波段合/分波器将来自光监控信号发射单元产生的光监控信号输入到第2合/分波器，该第2合/分波器将来自第2OSC合/分波器的OSC波段光信号输入与下中继节点连接光纤；
第2中继节点重复上述第1中继放大过程；……；第n中继节点重复上述第1中继放大 过程，所述的第2合/分波器将来自合/分波器的OSC波段光信号输入到连接远端的第二光纤；
3)所述的远端合/分波器接收到第二光纤发来的前向光信号，并将OSC波段的光输入到远端OSC波段合/分波器，该远端OSC波段合/分波器从接收到的OSC波段的光信号中分波出在λ 0～λ 1范围内的光监控信号，并输入到远端光监控信号接收单元；
三)通信数据信号传输可以为单纤单向传输也可以为单纤双向传输，为单纤单向传输时
只包括前向传输，为单纤双向传输时包括前向传输和后向传输，具体为：
1)前向通信数据信号传输过程为：
a)所述的本地端光通信数据单元将通信数据信号加载到OSC波段之外的光通信数据信号波段上，所述的本地端合/分波器将所述的光通信数据信号波段输入经所述的第一光纤输入所述的第1中继节点的第1合/分波器；
b)通信数据信号中继放大：
第1中继放大：第1中继节点的第1合/分波器将来自第一光纤的光通信数据信号输入所述的通信数据中继放大单元，该通信数据中继放大单元对接收到的光通信数据信号处理后，输入到所述的第2合/分波器，该第2合/分波器的输出端将所述的光通信数据信号输入到下一中继节点即第2中继节点的第1合/分波器；
第2中继放大：在第2中继节点重复上述的通信数据中继放大过程；……；第n次中继放大：在第n中继节点重复上述的通信数据中继放大过程；
c)所述的第n中继节点第2合/分波器的输出端将所述的光通信数据信号通过第二光纤输入到所述的远端合/分波器，该远端合/分波器将第二光纤输入的光通信数据波段的信号输入到所述的远端通信数据单元；
2)后向通信数据信号传输过程为：
a)所述的远端通信数据单元将通信数据信号加载到OSC波段之外的光通信数据信号波段上，该远端合/分波器将光通信数据信号波段通过第二光纤、第2合/分波器输入第n中继节点的通信数据中继放大单元；
b)通信数据信号中继放大：
所述的第n中继节点的通信数据中继放大单元对接收到的光通信数据信号处理后，输入到第1合/分波器，该第1合/分波器将光通信数据信号反向输入到下一中继节点的第2合/分波器；
c)所有中继节点反向地依次执行上述的通信数据中继放大过程，在第1中继节点的第1合/分波器将光通信数据信号通过第一光纤输入本地端合/分波器)，该本地端合/分波器将输入的光通信数据波段的信号输入到本地端光通信数据单元。
所述的λ 2、λ 3和λ′ 2、λ′ 3可以相等。
本发明的技术效果如下：
本发明利用标准商用OSC波段内不同的子波段来分别传输时间频率信号和光监控信号，再通过商用WDM光通信系统中的CWDM模块与光通信数据业务复用到一根光纤中，实现光纤时间频率和数据业务的联合传输。带来的主要技术效果包括：
1)本发明，利用标准OSC波段的子波段来传输时间频率信号，既不影响光监控信号的传输，又不占用额外的波段资源，波长资源利用率更高、成本更低；
2)本发明，时间频率传输的波长都位于OSC波段的子波段内，可灵活选择和组合，满足不同应用和系统需求。双向传输波长可以非常接近，甚至相同，可最多限度保证链路的双向对称性，提高时间频率传递的精度。
3)本发明，通过商用WDM光通信系统中的CWDM模块实现时间频率信号和光监控信号与光通信数据业务的复用，实施中不需要更换现有通信链路中的CWDM，不用中断原有通信数据业务，更容易实施、成本更低；
附图说明
图1是光纤时间频率和数据联合传输系统框图。
图2(a)为实施例1的OSC波段分割图，图2(b)为实施例2的OSC波段分割图。
图3是实施例1的结构示意图，(a)为系统本地端的结构示意图，(b)为系统中继节点的结构示意图，(c)为系统远端的结构示意图。
具体实施方式
本发明涉及光纤时间频率和通信数据联合传输，特别是一种用于WDM系统的光纤时间频率和通信数据联合传输的系统和方法。图1为光纤时间频率和数据联合传输系统框图。由图可见，本发明光纤时间频率和数据联合传输系统，包括本地端101、中继段和远端201，所述的中继段由n个中继节点401通过光纤串联构成，其中n≥0；所述的本地端101通过第一光纤301与第1中继节点401连接，第n中继节点通过第二光纤303与所述的远端201连接；所述的本地端101包括本地端时间频率信号单元102、本地端光监控信号发射单元103、本地端光通信数据单元104、本地端OSC波段合/分波器105和本地端合/分波器106，所述的本地端时间频率信号单元102与本地端OSC波段合/分波器105的分波端2相连，所述的本地端光监控信号发射单元103与本地端OSC波段合/分器105的分波端1相连，所述的OSC波段合/分波器105的合波端3与所述的本地端合/分波器106的分波端1相连，所述的本地端光通信数据单元104与本地端合/分波器106的分波端2相连，该本地端合/分波器106的合波端3与第一光纤30)的一端相连；
所述的中继节点401包括：第1合/分波器410、通信数据中继放大单元411、第1OSC波段合/分波器407、时间频率双向中继放大单元402、光监控信号接收单元408、光监控信号发射单元409、第2OSC波段合/分波器413和第2合/分波器412，所述的第1合/分波器410的合波端3与所述的第一光纤301的另一端相连，所述的第1合/分波器410的分波端2与所述的通信数据中继放大单元411的1端口相连，第1合/分波器410的分波端1与所述的第1OSC波段合/分波器407的合波端3相连，该第1OSC波段合/分波器407的分波端2与所述的光监控信号接收单元408相连，该第1OSC波段合/分波器407的分波端1与所述的时间频率双向中继放大单元402的1端口相连；所述的时间频率双向中继放大单元402的2端口与所述的第2OSC波段合/分波器413的分波端2相连，所述的光监控信号发射单元409与所述的第2OSC波段合/分波器413的分波端1相连，所述的第2OSC波段合/分波器413的合波端3与所述的第2合/分波器412的分波端1相连，所述的通信数据中继放大单元411的2端口与所述的合/分波器412的分波端2相连，所述的第2合/分波器412的合波端3通过一根光纤302与下一个中继节点401的第1合/分波器410的合波端3相连；所述的中继段的n个中继放大节点401依次通过光纤依次相连；第n个中继节点的第2合/分波器412的合波端3与所述的第二光纤303相连；
所述的远端201包括远端时间频率信号单元202、远端光监控信号接收单元203、远端通信数据单元204、远端OSC波段合/分波器205和远端合/分波器206，所述的远端时间频率信号单元202与远端OSC波段合/分波器205的分波端1相连，所述的远端光监控信号接收单元203与远端OSC波段合/分波器205的分波端2相连，远端OSC波段合/分波器205的合波端3与远端合/分波器(206)的分波端1相连，远端通信数据单元(204)与远端合/分波器(206)的分波端2相连，所述的远端合/分波器206的合波端3与第二光纤303的另一端相连。
系统采用的OSC波段为ITU标准G.692规定的可选OSC波段之一，目前为1500nm-1520nm或1470nm-1490nm或1310波段，也可以是未来ITU标准规定新的OSC波段；所述的本地端OSC波段合/分波器105、第1OSC波段合/分波器407、第2OSC波段合/ 分波器413、远端OSC波段合/分波器205工作于选定的OSC波段，实现光监控信号波长和时间频率传输信号波长的合波/分波。
系统中采用的本地端合/分波器106、第1合/分波器410、第2合/分波器412、远端合/分波器206用于实现OSC波段与本地端光通信数据单元104、远端通信数据单元20)的工作光波段的合波/分波。
系统中采用的时间频率传输波长和光监控信号波长都位于OSC波段，且工作的波长范围互不重叠。
所述的时间频率信号和光监控信号承载于OSC波段中不同的光波长，通信数据承载于OSC波段之外的波长上，所述3种信号通过波分复用经过一根光纤传输。
利用上述光纤时间频率和数据联合传输系统的时间频率和数据联合传输方法，其特点在于该方法的时间频率传输既可采用双向同纤同波，也可采用双向同纤不同波传输方式，包括下列步骤：
一)时间频率信号的传输包括前向传输和后向传输：
1)前向传输：时间频率信号从本地端传输到远端的方向为前向传输，前向时间频率传输过程包括：
a)所述的本地端时间频率信号单元102产生波长为λ 2(λ 2、λ 3，当时间频率分开传输时)的前向时间频率光信号，该前向时间频率光信号经过本地端OSC波段合/分波器105、本地端合/分波器106、传输到所述的第一光纤(301)上；
b)中继放大过程：
第1中继节点的放大过程为：第1合/分波器410将来自第一光纤301的光信号输入第1OSC波段合/分波器407，该第1OSC波段合/分波器407将来自第1合/分波器410的前向时间频率光信号输入所述的时间频率双向中继放大单元402，该时间频率双向中继放大单元402对接收到的前向时间频率光信号进行前向中继放大，所述的第2OSC波段合/分波器413将来自时间频率双向中继放大单元402的前向时间频率光信号输入第2合/分波器412，该第2合/分波器412将来自合/分波器413的OSC波段光信号输入与下一个中继节点连接的光纤；
第2中继节点重复上述第1中继放大过程；……；第n中继节点重复上述第1中继放大过程，第n中继节点的第2合/分波器412)来自合/分波器413的OSC波段光信号输入到连接远端的第二光纤303；
c)所述的远端合/分波器206接收到第二光纤303发来的前向时间频率光信号，并将OSC波段的光输入到远端OSC波段合/分波器205，该远端OSC波段合/分波器205从接收到的OSC波段的光信号中分波出波长为λ 2(λ 2、λ 3)的前向时间频率光信号，并输入到远端时间频率信号单元202；
2)后向时间频率传输过程为(时间频率信号从远端传输到本地端的方向为后向)：
a)所述的远端时间频率信号单元202产生波长为λ′ 2(λ′ 2、λ′ 3，当时间频率分开传输时)的后向时间频率光信号，后向时间频率光信号经过远端OSC波段合/分波器205输入到远端合/分波器206，该远端合/分波器206将后向时间频率光信号输入到第二光纤303上；
b)第n中继节点的第2合/分波器412将来自第二光纤303的光信号输入到第2OSC波段合/分波器413，该第2OSC波段合/分波器41)从来自第2合/分波器412的光信号中分波出波长为λ′ 2(λ′ 2、λ′ 3，当时间频率分开传输时)的后向时间频率光信号，并将后向时间频率光信号输入到时间频率双向中继放大单元402；时间频率双向中继放大单元402对接收到光信号进行中继放大处理，所述的第1OSC波段合/分波器407将来自时间频率双向中继放大单元(402)的后向时间频率光信号输入到第1合/分波器410，该第1合/分波器410通过一根光纤将来自第1合/分波器407的OSC波段光信号输入到上一个节点的合/分波器412；
重复n次(n≥0)上述的中继放大过程，在最前端的中继节点401中，所述的合/分波器 410将来自合/分波器407的OSC波段光信号输入到第一光纤301；
c)本地端合/分波器106接收到来自第一光纤301的光信号，并将OSC波段的光输入到OSC波段合/分波器105；OSC波段合/分波器105将波长为λ′ 2(λ′ 2、λ′ 3，当时间频率分开传输时；λ′ 2、λ′ 3可以等于λ 2、λ 3)的后向时间频率光信号解复用并输入到本地端时间频率信号单元102，本地端时间频率信号单元102接收到从本地端OSC波段合/分波器105输出的后向时间频率光信号，进行时间频率比对和时钟同步；
二)光监控信号的传输过程，包括下列步骤：
1)所述的本地端光监控信号发射单元103产生波长在λ 0～λ 1范围内的光监控信号，其中，λ 0,λ 1均在OSC波段内，且λ 0～λ 1范围不包含时间频率传递波长λ 2,λ 3；所述的光监控信号经本地端OSC波段合/分波器105输入到本地端合/分波器106，该本地端合/分波器106将来自本地端OSC波段合/分波器105的光信号输入到第一光纤301)；
2)光监控信号的中继放大过程为：
第1中继节点401的第1合/分波器410将来自第一光纤301的光信号输入到第1OSC波段合/分波器407，该第1OSC波段合/分波器407从来自第1合/分波器410的光信号中分波出波长在λ 0～λ 1范围的光监控信号光，并输入到光监控信号接收单元408，光监控信号发射单元409产生波长在λ 0～λ 1范围内的光监控信号输入到第2OSC波段合/分波器413，第2OSC波段合/分波器413将来自光监控信号发射单元409产生的光监控信号输入到第2合/分波器412，该第2合/分波器412将来自第2OSC合/分波器413的OSC波段光信号输入与下中继节点401连接光纤；
第2中继节点重复上述第1中继放大过程；……；第n中继节点重复上述第1中继放大过程，第n中继节点的第2合/分波器412将来自合/分波器413的OSC波段光信号输入到连接远端的第二光纤303；
3)所述的远端合/分波器206接收到第二光纤303发来的前向光信号，并将OSC波段的光输入到远端OSC波段合/分波器205，该远端OSC波段合/分波器205从接收到的OSC波段的光信号中分波出在λ 0～λ 1范围内的光监控信号，并输入到远端光监控信号接收单元203；
三)通信数据信号传输可以为单纤单向传输也可以为单纤双向传输，为单纤单向传输时
只包括前向传输，为单纤双向传输时包括前向传输和后向传输，具体为：
1)前向通信数据信号传输过程为：
a)所述的本地端光通信数据单元104将通信数据信号加载到OSC波段之外的光通信数据信号波段上，所述的本地端合/分波器106将所述的光通信数据信号波段输入经所述的第一光纤301输入所述的第1中继节点的第1合/分波器410；
b)通信数据信号中继放大：
第1中继放大：第1中继节点的第1合/分波器410将来自第一光纤301的光通信数据信号输入所述的通信数据中继放大单元411，该通信数据中继放大单元411对接收到的光通信数据信号处理后，输入到所述的第2合/分波器412，该第2合/分波器412的输出端将所述的光通信数据信号输入到下一中继节点即第2中继节点的第1合/分波器410；
第2中继放大：在第2中继节点重复上述第1中继放大的通信数据中继放大过程；……；第n次中继放大：在第n中继节点重复上述第1中继放大的通信数据中继放大过程；
c)所述的第n中继节点的第2合/分波器412的输出端将所述的光通信数据信号通过第二光纤303输入到所述的远端合/分波器206，该远端合/分波器206将第二光纤303输入的光通信数据波段的信号输入到所述的远端通信数据单元204；
2)后向通信数据信号传输过程为：
a)所述的远端通信数据单元204将通信数据信号加载到OSC波段之外的光通信数据信号波段上，该远端合/分波器206将光通信数据信号波段通过第二光纤303、第2合/分波器 412输入第n中继节点的通信数据中继放大单元411；
b)通信数据信号中继放大：
所述的第n中继节点的通信数据中继放大单元411对接收到的光通信数据信号处理后，输入到第1合/分波器410，该第1合/分波器410将光通信数据信号反向输入到下一中继节点的第2合/分波器412；
c)所有中继节点反向地依次执行上述的通信数据中继放大过程，在第1中继节点的第1合/分波器410将光通信数据信号通过第一光纤301输入本地端合/分波器106，该本地端合/分波器106将输入的光通信数据波段的信号输入到本地端光通信数据单元104。
所述的λ 2、λ 3和λ′ 2、λ′ 3可以相等。
下述实施例1和实施例2中，只有1个中继节点，但中继节点有可能为多个，也可能为0个。
下面给出OSC波段为1500nm-1520nm时，采用两种分割方式的具体实施例。但不应以此限制本发明的保护范围。
实施例1：
本实施例利用OSC波段内未被商用光监控信号发送光模块覆盖的波长来传输双向时间信号。该实施例中，OSC波段的分割方式如图2(a)所示。1500nm-1520nm为ITU标准G.692规定的可选OSC波段之一。光监控信号波长位于1503.5nm-1516.5nm子波段内。该子波段(1503.5nm-1516.5nm)与现有大多数商用光监控信号发送光模块的工作波长范围重合。前向时间信号和后向时间信号都承载于1511nm CWDM模块(即本地端合/分波器106、第1合/分波器410、第2合/分波器412、远端合/分波器206)工作波长范围(标准规定为1503.5nm-1518.5nm)内未被光监控信号子波段(1503.5nm-1516.5nm)覆盖的波长1517nm上，通过同纤同波双向时分复用的方式实现双向传输。通信数据信号波长位于C波段(1530nm-1565nm)。
图3(a)为实施例1中光纤时间和数据联合传输系统本地端的结构示意图。本地端101包括：本地端时间信号单元102、光监控信号发射单元103、本地端光通信数据单元104、本地端OSC波段合/分波器105，以及本地端合/分波器106。其中，本地端时间信号单元102包括发射单元502和接收单元503和环形器504。本地端时间信号单元102的发射单元502与环形器50)的端口1相连，接收单元503与环形器504的端口2相连，环形器504的3端口与OSC波段合/分器105的分波端2相连。光监控信号发射单元103与OSC波段合/分器105的分波端1相连，OSC波段合/分器105的合波端3与本地端合/分波器106的分波端1(工作波长范围为1503.5nm-1518.5nm)相连，本地端光通信数据单元104与本地端合/分波器106的分波端2(工作波长范围为C波段)相连。本地端合/分波器106的合波端3与第一光纤301相连。本地端OSC波段合/分波器105用来将1503.5nm-1516.5nm的光监控信号和1517nm波长的前向时间信号进行合波，也用来将1517nm波长的后向时间信号从OSC波段中波分出来。本地端合/分波器106用来对OSC波段的光信号和C波段的通信数据信号进行合波和分波。
本地端时间信号单元102的发射单元502产生波长为1517nm的前向时间光信号，发射单元502在完成1517nm波长的前向时间光信号后，停止发射光信号。前向时间光信号经过环形器504输入到本地端OSC波段合/分波器105。本地端的光监控信号发射单元103产生波长在1503.5nm-1516.5nm范围内的光监控信号，并输入到本地端OSC波段合/分波器105。本地端OSC波段合/分波器105将来自环形器504的前向时间光信号和来自光监控信号发射单元103的光监控信号合波输入到本地端合/分波器106。本地端光通信数据单元104将通信数据信号加载到C波段上，并输入到本地端合/分波器106。本地端合/分波器106将来自本地端OSC波段合/分波器105的光信号和来自本地端光通信数据单元104的通信数据信号合波输入到第一光纤301上。
本地端101的本地端合/分波器106接收到来自第一光纤301的后向光信号，本地端合/分波器106分波出OSC波段的后向光信号输入到合/分波器105。合/分波器105分波出波长为1517nm的后向时间光信号输入到环形器504，环形器504将后向时间光信号输入到本地端时间信号单元102的接收单元503。接收单元503接收到波长为1517nm的后向时间光信号，进行时间比对和时钟同步。
图3(b)为实施例1中光纤时间和数据联合传输系统中继节点结构示意图。中继节点401包括：第1合/分波器410、光放大器411、第1OSC波段合/分波器407、双向中继放大单元402、光监控信号接收单元408、光监控信号发射单元409、第2OSC波段合/分波器413、第2合/分波器412。光放大器411为C波段单向光放大器，对前向传输的C波段的光通信数据进行单向放大。光放大器411也可为C波段双向光放大器，支持同纤双向数据传输。双向中继放大单元402采用光纤时间传递单纤双向中继和光放大器[参见吴龟灵，张浩，陈建平，"高精度光纤时间传递双向光放大方法与装置，"申请号CN201610073321.3，2016.6；参见吴龟灵，左发兴，陈建平，“高精度大范围光纤时间传递方法与系统，”申请号：CN201811440812.2,2018.11.]，支持同纤同波双向时分复用传输。第1OSC波段合/分波器407和第2OSC波段合/分波器413用来将1503.5nm-1516.5nm的光监控信号与1517nm波长的前向时间信号进行合波和分波，也用来将1517nm波长的后向时间信号从OSC波段中波分出来。第1合/分波器410和第2合/分波器412用来对OSC波段的光信号和C波段的通信数据信号进行合波和分波。第1合/分波器410和第2合/分波器412的1端口的工作波长范围为1503.5nm-1518.5nm，2端口的工作波长范围为C波段。
来自第一光纤301的光信号经中继节点401的第1合/分波器410波分为OSC波段的光信号和C波段的光信号。OSC波段的光信号的经第1OSC波段合/分波器407波分出波长为1517nm的前向时间光信号和波长在1503.5nm-1516.5nm范围的光监控信号。波长为1517nm的前向时间光信号输入到双向中继放大单元402中继和放大后输入到第2OSC波段合/分波器413。波长在1503.5nm-1516.5nm范围的光监控信号输入到光监控信号接收单元408进行处理。光监控信号发射单元(409)产生波长在1503.5nm-1516.5nm范围内的光监控信号输入到第2OSC波段合/分波器413。第2OSC波段合/分波器413将来自双向中继放大单元402的前向时间光信号和光监控信号发射单元409的光监控信号合波输入到第2合/分波器412。第1合/分波器410波分出的C波段的光通信数据信号经光放大器411光放大后，输入到第2合/分波器412。第2合/分波器412将来自合/分波器(413的OSC波段光信号与光放大器411的光通信数据信号合波输入第二光纤303。
来自第二光纤303的光信号经过中继节点401的第2合/分波器412分波出OSC波段的光信号，并输入到第2OSC波段合/分波器413。第2OSC波段合/分波器413从来自第2合/分波器412的光信号中分波出波长为1517nm的后向时间光信号，并将后向时间光信号输入到双向中继放大单元402。双向中继放大单元402对接收到波长为1517nm的后向时间光信号进行后向中继放大处理，并输入到第1OSC波段合/分波器407。第1OSC波段合/分波器407将来自双向中继放大单元402的后向时间光信号输入到第1合/分波器410，第1合/分波器410将来自合/分波器407的OSC波段光信号输入到第一光纤301。
图3(c)为该实施例中光纤时间和数据联合传输系统远端结构示意图。远端201包括：远端时间信号单元202、远端光监控信号接收单元203、远端通信数据单元204、远端合/分波器206、远端OSC波段合/分波器205。其中，远端时间信号单元202包括发射单元512、接收单元513和环形器514。远端时间信号单元202内的发射单元512与环形器514的1端口相连，接收单元513与环形器514的2端口相连，环形器514的2端口与远端OSC波段合/分波器205的分波端1相连。远端光监控信号接收单元203与远端OSC波段合/分波器205的分波端2相连。远端OSC波段合/分波器205的合波端3与远端合/分波器206的分波端 1(工作波长范围为1503.5nm-1518.5nm)相连，远端通信数据单元204与远端合/分波器206的分波端2(工作波长范围为C波段)相连。远端合/分波器206的合波端3与第二光纤303相连。远端OSC波段合/分波器205用来将1503.5nm-1516.5nm的光监控信号和1517nm波长的前向时间信号进行分波，也用来将1517nm波长的后向时间信号合波到OSC波段中。远端合/分波器206用来对OSC波段的光信号和C波段的通信数据信号进行合波和分波。
来自第二光纤303的前向光信号经过远端节点的远端合/分波器206波分为OSC波段的前向光信号和C波段的通信数据信号。来自远端合/分波器206的的OSC波段光信号经远端OSC波段合/分波器205波分出波长为1517nm的前向时间光信号和波长在1503.5nm-1516.5nm范围的光监控信号。来自合/分波器205的前向时间光信号经环形器514输入到远端时间信号单元202的接收单元513，接收单元513对接收到的波长为1517nm的前向时间光信号进行处理。来自合/分波器205的光监控信号输入到远端光监控信号接收单元203，远端光监控信号接收单元203对接收到的波长在1503.5nm-1516.5nm范围内的光监控信号进行处理。来自远端合/分波器206的C波段的通信数据信号输入到远端通信数据单元204，远端通信数据单元204对接收到的通信数据信号进行处理。
接收单元513在接收到波长为1517nm的前向时间光信号后，延迟一段时间后(保证光纤链路上不同时存在波长都为1517nm的前向时间信号和后向时间信号)，发射单元513产生波长为1517nm的后向时间光信号。后向时间信号经过环形器514输入到远端OSC波段合/分波器205，远端OSC波段合/分波器205将波长为1517nm的后向时间信号输入到远端合/分波器206。远端合/分波器206将后向时间信号输入到第二光纤303上。
该实施例中，承载时间信号的波长为1517nm，但也可以是OSC波段内除1503.5nm-1516.5nm范围以外的任意波长，例如1518nm、1519nm等。该实施例中，前向时间信号和后向时间信号都承载于波长1517nm，即采用同纤同波双向时分复用的方式来传输时间信号。但前向时间信号和后向时间信号也可以承载于OSC波段除1503.5nm-1516.5nm波段以外的任意不同波长，例如前向时间信号承载于1518nm波长，后向时间信号承载于1519nm波长，即采用同纤不同波的双向波分复用方式来传输时间信号。该实施例中，OSC波段内未被商用光监控信号发送光模块覆盖的波长也可用于频率信号的传输，或者时间频率信号的联合传输。
实施例2：
该实施例中，OSC波段的分割方式如图2(b)所示。1500nm-1520nm为ITU标准G.692规定OSC波段之一，1503.5nm-1516.5nm为现有商用光监控信号光发送模块的波长范围。光监控信号波长在1506.5nm-1513.5nm范围内，小于现有大多数商用光监控信号发送光模块的波长范围1503.5nm-1516.5nm。前向时间信号和后向时间信号承载于1511nm CWDM模块(即本地端合/分波器106、第1合/分波器410、第2合/分波器412、远端合/分波器206)工作波长范围(标准规定为1503.5nm-1518.5nm)未被光监控信号波长范围(1506.5nm-1513.5nm)覆盖的波长1515nm上，通过同纤同波双向时分复用的方式实现双向传输。通信数据信号承载于C波段(1530nm-1565nm)的波长。
与实施例1相比，本实施例中，通过一定的手段，如对商用光监控信号光发送模块的温度控制，将光监控信号波长进一步限制在更小的(1506.5nm-1513.5nm)范围内，增加时间频率信号传递可选波长的范围。从而在CWDM通道带宽较小的情况下，时间频率信号也可获得可用的波长。
在该实施例中，光纤时间和数据联合传输系统组成和连接与实施例1相同。不同之处仅在于本地端OSC波段合/分波器105、第1OSC波段合/分波器407、第2OSC波段合/分波器413、远端OSC波段合/分波器205能将波长在1506.5nm-1513.5nm范围内的光监控信号 和波长为1515nm的前向时间信号合波，也能将波长为1515nm的后向时间信号从OSC波段中分波出来。该实施例的光纤时间和数据联合传输的方法与实施例1相同，所不同的是前向时间信号和后向时间信号承载于1515nm波长，光监控信号承载于1506.5nm-1513.5nm波长。承载时间信号的波长为1515nm，但也可以是除了1506.5nm-1513.5nm波段以外的任意OSC波段的波长，例如1516nm等。此外，承载光监控信号的波长为1506.5nm-1513.5nm，但也可以是1505.5nm-1514.5nm等，只要承载光监控信号的波长范围小于商用光监控信号光模块的波长范围(1503.5nm-1516.5nm)，并为承载时间信号留下可用波段即可。

Claims (7)

  1. 一种光纤时间频率和数据联合传输系统，其特征在于包括：本地端(101)、中继段和远端(201)，所述的中继段由n个中继节点(401)通过光纤串联构成，其中n≥0；所述的本地端(101)通过第一光纤(301)与第1中继节点(401)连接，第n中继节点(401)通过第二光纤(303)与所述的远端(201)连接；
    所述的本地端(101)包括本地端时间频率信号单元(102)、本地端光监控信号发射单元(103)、本地端光通信数据单元(104)、本地端OSC波段合/分波器(105)和本地端合/分波器(106)，所述的本地端时间频率信号单元(102)与本地端OSC波段合/分波器(105)的分波端2相连，所述的本地端光监控信号发射单元(103)与本地端OSC波段合/分器(105)的分波端1相连，所述的OSC波段合/分波器(105)的合波端3与所述的本地端合/分波器(106)的分波端1相连，所述的本地端光通信数据单元(104)与本地端合/分波器(106)的分波端2相连，该本地端合/分波器(106)的合波端3与第一光纤(301)的一端相连；
    所述的中继节点(401)包括：第1合/分波器(410)、通信数据中继放大单元(411)、第1OSC波段合/分波器(407)、时间频率双向中继放大单元(402)、光监控信号接收单元(408)、光监控信号发射单元(409)、第2OSC波段合/分波器(413)和第2合/分波器(412)，所述的第1合/分波器(410)的合波端3与所述的第一光纤(301)的另一端相连，所述的第1合/分波器(410)的分波端2与所述的通信数据中继放大单元(411)的1端口相连，第1合/分波器(410)的分波端1与所述的第1OSC波段合/分波器(407)的合波端3相连，该第1OSC波段合/分波器(407)的分波端2与所述的光监控信号接收单元(408)相连，该第1OSC波段合/分波器(407)的分波端1与所述的时间频率双向中继放大单元(402)的1端口相连；所述的时间频率双向中继放大单元(402)的2端口与所述的第2OSC波段合/分波器(413)的分波端2相连，所述的光监控信号发射单元(409)与所述的第2OSC波段合/分波器(413)的分波端1相连，所述的第2OSC波段合/分波器(413)的合波端3与所述的第2合/分波器(412)的分波端1相连，所述的通信数据中继放大单元(411)的2端口与所述的合/分波器(412)的分波端2相连，所述的第2合/分波器(412)的合波端3通过一根光纤(302)与下一个中继节点401的第1合/分波器(410)的合波端3相连；所述的中继段的n个中继放大节点(401)依次通过光纤依次相连；第n个中继节点的第2合/分波器(412)的合波端3与所述的第二光纤(303)相连；
    所述的远端(201)包括远端时间频率信号单元(202)、远端光监控信号接收单元(203)、远端通信数据单元(204)、远端OSC波段合/分波器(205)和远端合/分波器(206)，所述的远端时间频率信号单元(202)与远端OSC波段合/分波器(205)的分波端1相连，所述的远端光监控信号接收单元(203)与远端OSC波段合/分波器(205)的分波端2相连，远端OSC波段合/分波器(205)的合波端3与远端合/分波器(206)的分波端1相连，远端通信数据单元(204)与远端合/分波器(206)的分波端2相连，所述的远端合/分波器(206)的合波端3与第二光纤(303)的另一端相连。
  2. 根据权利要求1所述的光纤时间频率和数据联合传输系统，其特征在于系统采用的OSC波段为ITU标准G.692规定的可选OSC波段之一，目前为1500nm-1520nm或1470nm-1490nm或1310波段，也可以是未来ITU标准规定新的OSC波段；所述的本地端OSC波段合/分波器(105)、第1OSC波段合/分波器(407)、第2OSC波段合/分波器(413)、远端OSC波段合/分波器(205)工作于选定的OSC波段，实现光监控信号波长和时间频率传输信号波长的合波/分波。
  3. 根据权利要求1所述的光纤时间频率和数据联合传输系统，其特征在于，系统中采用的本地端合/分波器(106)、第1合/分波器(410)、第2合/分波器(412)、远端合/分波器(206)用于实现OSC波段与本地端光通信数据单元(104)、远端通信数据单元(204)的工作光波段的 合波/分波。
  4. 根据权利要求1所述的光纤时间频率和数据联合传输系统，其特征在于，系统中采用的时间频率传输波长和光监控信号波长都位于OSC波段，且工作的波长范围互不重叠。
  5. 根据权利要求1所述的光纤时间频率和数据联合传输系统，其特征在于，所述的时间频率信号和光监控信号承载于OSC波段中不同的光波长，通信数据承载于OSC波段之外的波长上，所述3种信号通过波分复用经过一根光纤传输。
  6. 利用权利要求1所述的光纤时间频率和数据联合传输系统的时间频率和数据联合传输方法，其特征在于该方法的时间频率传输既可采用双向同纤同波，也可采用双向同纤不同波传输方式，包括下列步骤：
    一)时间频率信号的传输包括前向传输和后向传输：
    1)前向传输：时间频率信号从本地端传输到远端的方向为前向传输，前向时间频率传输过程包括：
    a)所述的本地端时间频率信号单元(102)产生波长为λ 2(λ 2、λ 3，当时间频率分开传输时)的前向时间频率光信号，该前向时间频率光信号经过本地端OSC波段合/分波器(105)、本地端合/分波器(106)、传输到所述的第一光纤(301)上；
    b)中继放大过程：
    第1中继节点的放大过程为：第1合/分波器(410)将来自第一光纤(301)的光信号输入第1OSC波段合/分波器(407)，该第1OSC波段合/分波器(407)将来自第1合/分波器(410)的前向时间频率光信号输入所述的时间频率双向中继放大单元(402)，该时间频率双向中继放大单元(402)对接收到的前向时间频率光信号进行前向中继放大，所述的第2OSC波段合/分波器(413)将来自时间频率双向中继放大单元(402)的前向时间频率光信号输入第2合/分波器(412)，该第2合/分波器(412)将来自合/分波器(413)的OSC波段光信号输入与下一个中继节点连接的光纤；
    第2中继节点重复上述第1中继放大过程；……；第n中继节点重复上述第1中继放大过程，第n中继节点的第2合/分波器(412)将来自合/分波器(413)的OSC波段光信号输入到连接远端的第二光纤(303)；
    c)所述的远端合/分波器(206)接收到第二光纤(303)发来的前向时间频率光信号，并将OSC波段的光输入到远端OSC波段合/分波器(205)，该远端OSC波段合/分波器(205)从接收到的OSC波段的光信号中分波出波长为λ 2(λ 2、λ 3)的前向时间频率光信号，并输入到远端时间频率信号单元(202)；
    2)后向时间频率传输过程为(时间频率信号从远端传输到本地端的方向为后向)：
    a)所述的远端时间频率信号单元(202)产生波长为λ′ 2(λ′ 2、λ′ 3，当时间频率分开传输时)的后向时间频率光信号，后向时间频率光信号经过远端OSC波段合/分波器(205)输入到远端合/分波器(206)，该远端合/分波器(206)将后向时间频率光信号输入到第二光纤(303)上；
    b)中继节点的第2合/分波器(412)将来自第二光纤(303)的光信号输入到第2OSC波段合/分波器(413)，该第2OSC波段合/分波器(413)从来自第2合/分波器(412)的光信号中分波出波长为λ′ 2(λ′ 2、λ′ 3，当时间频率分开传输时)的后向时间频率光信号，并将后向时间频率光信号输入到时间频率双向中继放大单元(402)；时间频率双向中继放大单元(402)对接收到光信号进行中继放大处理，所述的第1OSC波段合/分波器(407)将来自时间频率双向中继放大单元(402)的后向时间频率光信号输入到第1合/分波器(410)，该第1合/分波器(410)通过一根光纤将来自第1合/分波器(407)的OSC波段光信号输入到上一个节点(401)的合/分波器(412)；
    重复n次(n≥0)上述的中继放大过程，在最前端的中继节点(401)中，所述的合/分波器(410)将来自合/分波器(407)的OSC波段光信号输入到第一光纤(301)；
    c)本地端的本地端合/分波器(106)接收到来自第一光纤(301)的光信号，并将OSC波段的 光输入到OSC波段合/分波器(105)；OSC波段合/分波器(105)将波长为λ′ 2(λ′ 2、λ′ 3，当时间频率分开传输时；λ′ 2、λ′ 3可以等于λ 2、λ 3)的后向时间频率光信号解复用并输入到本地端时间频率信号单元(102)，本地端时间频率信号单元(102)接收到从本地端OSC波段合/分波器(105)输出的后向时间频率光信号，进行时间频率比对和时钟同步；
    二)光监控信号的传输过程，包括下列步骤：
    1)所述的本地端光监控信号发射单元(103)产生波长在λ 0～λ 1范围内的光监控信号，其中，λ 0,λ 1均在OSC波段内，且λ 0～λ 1范围不包含时间频率传递波长λ 2,λ 3；所述的光监控信号经本地端OSC波段合/分波器(105)输入到本地端合/分波器(106)，该本地端合/分波器(106)将来自本地端OSC波段合/分波器(105)的光信号输入到第一光纤(301)上；
    2)光监控信号的中继放大过程为：
    第1中继节点(401)的第1合/分波器(410)将来自第一光纤(301)的光信号输入到第1OSC波段合/分波器(407)，该第1 OSC波段合/分波器(407)从来自第1合/分波器(410)的光信号中分波出波长在λ 0～λ 1范围的光监控信号光，并输入到光监控信号接收单元(408)，光监控信号发射单元(409)产生波长在λ 0～λ 1范围内的光监控信号输入到第2 OSC波段合/分波器(413)，第2 OSC波段合/分波器(413)将来自光监控信号发射单元(409)产生的光监控信号输入到第2合/分波器(412)，该第2合/分波器(412)将来自第2 OSC合/分波器(413)的OSC波段光信号输入与下中继节点(401)连接光纤；
    第2中继节点重复上述第1中继放大过程；……；第n中继节点重复上述第1中继放大过程，所述的第2合/分波器(412)将来自合/分波器(413)的OSC波段光信号输入到连接远端的第二光纤(303)；
    3)所述的远端合/分波器(206)接收到第二光纤(303)发来的前向光信号，并将OSC波段的光输入到远端OSC波段合/分波器(205)，该远端OSC波段合/分波器(205)从接收到的OSC波段的光信号中分波出在λ 0～λ 1范围内的光监控信号，并输入到远端光监控信号接收单元(203)；
    三)通信数据信号传输是单纤单向传输或单纤双向传输：
    当通信数据信号传输为单纤单向传输时，包括前向传输；
    当通信数据信号传输为单纤双向传输时，包括前向传输和后向传输；
    1)前向通信数据信号传输过程为：
    a)所述的本地端光通信数据单元(104)将通信数据信号加载到OSC波段之外的光通信数据信号波段上，所述的本地端合/分波器(106)将所述的光通信数据信号波段输入经所述的第一光纤(301)输入所述的第1中继节点(4011)的第1合/分波器(410)；
    b)通信数据信号中继放大：
    第1中继放大：第1中继节点的第1合/分波器(410)将来自第一光纤(301)的光通信数据信号输入所述的通信数据中继放大单元(411)，该通信数据中继放大单元(411)对接收到的光通信数据信号处理后，输入到所述的第2合/分波器(412)，该第2合/分波器(412)的输出端将所述的光通信数据信号输入到下一中继节点即第2中继节点的第1合/分波器(410)；
    第2中继放大：在第2中继节点重复上述第1中继放大的通信数据中继放大过程；……；第n次中继放大：在第n中继节点重复上述第1中继放大的通信数据中继放大过程；
    c)所述的第n中继节点的第2合/分波器(412)的输出端将所述的光通信数据信号通过第二光纤(303)输入到所述的远端合/分波器(206)，该远端合/分波器(206)将第二光纤(303)输入的光通信数据波段的信号输入到所述的远端通信数据单元(204)；
    2)后向通信数据信号传输过程为：
    a)所述的远端通信数据单元(204)将通信数据信号加载到OSC波段之外的光通信数据信号波段上，该远端合/分波器(206)将光通信数据信号波段通过第二光纤(303)、第2合/分波器 (412)输入第n中继节点的通信数据中继放大单元(411)；
    b)通信数据信号中继放大：
    所述的第n中继节点的通信数据中继放大单元(411)对接收到的光通信数据信号处理后，输入到第1合/分波器(410)，该第1合/分波器(410)将光通信数据信号反向输入到下一中继节点的第2合/分波器(412)；
    c)所有中继节点反向地依次执行上述的通信数据中继放大过程，在第1中继节点(4012)的第1合/分波器(410)将光通信数据信号通过第一光纤(301)输入本地端合/分波器(106)，该本地端合/分波器(106)将输入的光通信数据波段的信号输入到本地端光通信数据单元(104)。
  7. 利用权利要求6所述的光纤时间频率和数据的联合传输方法，其特征在于所述的λ 2、λ 3和λ′ 2、λ′ 3可以相等。
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023040619A1 (zh) * 2021-09-14 2023-03-23 华为技术有限公司 局端节点、叶子节点和光通信网
US20240278942A1 (en) * 2021-10-14 2024-08-22 National Time Service Center, the Chinese Academy of Sciences Method for correcting orbit error of common-view time comparison of space station

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110212985B (zh) * 2019-05-28 2021-07-27 上海交通大学 光纤时间频率和数据联合传输系统和方法
CN113541795B (zh) * 2020-04-17 2022-04-15 烽火通信科技股份有限公司 一种波分系统osc通道单纤双向实现方法及设备
CN111698032B (zh) * 2020-06-16 2021-04-20 中国科学院国家授时中心 一种单纤单向时间传递方法及系统
CN113193918B (zh) * 2021-04-26 2022-08-09 上海交通大学 将时间和频率传递信号复合到单个100g波分复用信道传输的装置
CN113765613A (zh) * 2021-07-01 2021-12-07 齐鲁空天信息研究院 动态双节点时频同步方法、装置、设备及存储介质
CN117318823A (zh) * 2021-09-26 2023-12-29 中国科学院微小卫星创新研究院 一种基于飞秒光梳的星间时频通信传递系统
CN114374429B (zh) * 2021-12-08 2023-07-04 武汉光迅科技股份有限公司 一种带单纤双向osc的c++波段edfa装置
US11864140B2 (en) * 2022-01-19 2024-01-02 Intelligent Fusion Technology, Inc. Methods and systems for time synchronization among unmanned aerial systems
US12504772B2 (en) 2022-01-19 2025-12-23 Intelligent Fusion Technology, Inc. Method, system and storage medium of resilient human-on-the-loop range-only cooperative positioning of plurality of unmanned aerial vehicles
CN116707648A (zh) * 2022-02-25 2023-09-05 上海交通大学 一种联合光纤时频传递和链路感知系统
CN116707627A (zh) * 2022-02-25 2023-09-05 上海交通大学 光纤时间传递网络保护与恢复方法及其装置
CN114826475B (zh) * 2022-05-11 2025-06-13 中国科学院上海光学精密机械研究所 一种在以太通信网中融合实现高精度时频同步的方法
US20250317234A1 (en) * 2022-05-16 2025-10-09 Nippon Telegraph And Telephone Corporation Optical transmission system and control signal transmitting and receiving method
US12278693B2 (en) * 2022-12-06 2025-04-15 Ciena Corporation Stretched single optical span communications system and method avoiding hazardous power levels
CN119727989B (zh) * 2024-12-31 2025-10-28 中国人民解放军陆军工程大学 一种基于增益开关激光器调控的光纤授时系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0738055A2 (en) * 1995-04-14 1996-10-16 Nippon Telegraph And Telephone Corporation Phase synchronization system
CN103931122A (zh) * 2011-05-24 2014-07-16 阿姆斯特丹自由大学及阿姆斯特丹自由大学医疗中心基金会 网络同步和频率传播的系统和方法
CN109428665A (zh) * 2017-08-22 2019-03-05 中国电信股份有限公司 波分复用发送设备、接收设备、中继设备以及传输系统
CN110212985A (zh) * 2019-05-28 2019-09-06 上海交通大学 光纤时间频率和数据联合传输系统和方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4373397B2 (ja) * 2003-11-11 2009-11-25 富士通株式会社 光伝送装置
JP4304298B2 (ja) * 2004-02-13 2009-07-29 日本電気株式会社 通信システム及びその同期方法
US7787775B2 (en) * 2006-05-08 2010-08-31 Tellabs Operations, Inc. Methods and apparatus for optical networks
US20120051739A1 (en) * 2008-12-22 2012-03-01 Marc Stephens Identifying a Characteristic of a Mesh Network
US8554074B2 (en) * 2009-05-06 2013-10-08 Ciena Corporation Colorless, directionless, and gridless optical network, node, and method
US8643941B2 (en) * 2009-12-14 2014-02-04 Finisar Israel Ltd. Automatic measurement and gain control of distributed Raman amplifiers
CN105739215B (zh) 2016-02-02 2018-03-09 上海交通大学 高精度光纤时间传递双向光放大方法与装置
US10003426B2 (en) * 2016-02-19 2018-06-19 Huawei Technologies Co., Ltd. Wavelength conflict detection using coded pilot tone
CN109921872B (zh) 2018-11-29 2020-11-10 上海交通大学 光纤时间传递系统和传递方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0738055A2 (en) * 1995-04-14 1996-10-16 Nippon Telegraph And Telephone Corporation Phase synchronization system
CN103931122A (zh) * 2011-05-24 2014-07-16 阿姆斯特丹自由大学及阿姆斯特丹自由大学医疗中心基金会 网络同步和频率传播的系统和方法
CN109428665A (zh) * 2017-08-22 2019-03-05 中国电信股份有限公司 波分复用发送设备、接收设备、中继设备以及传输系统
CN110212985A (zh) * 2019-05-28 2019-09-06 上海交通大学 光纤时间频率和数据联合传输系统和方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023040619A1 (zh) * 2021-09-14 2023-03-23 华为技术有限公司 局端节点、叶子节点和光通信网
US20240278942A1 (en) * 2021-10-14 2024-08-22 National Time Service Center, the Chinese Academy of Sciences Method for correcting orbit error of common-view time comparison of space station
US12545443B2 (en) * 2021-10-14 2026-02-10 National Time Service Center, the Chinese Academy of Sciences Method for correcting orbit error of common-view time comparison of space station

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