WO2016111193A1 - 通信装置および搬送波周波数制御方法 - Google Patents
通信装置および搬送波周波数制御方法 Download PDFInfo
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- WO2016111193A1 WO2016111193A1 PCT/JP2015/086176 JP2015086176W WO2016111193A1 WO 2016111193 A1 WO2016111193 A1 WO 2016111193A1 JP 2015086176 W JP2015086176 W JP 2015086176W WO 2016111193 A1 WO2016111193 A1 WO 2016111193A1
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- 238000004891 communication Methods 0.000 title claims description 85
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- 230000008054 signal transmission Effects 0.000 claims 1
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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
- H04B10/50—Transmitters
- H04B10/572—Wavelength control
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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
- H04B10/03—Arrangements for fault recovery
- H04B10/032—Arrangements for fault recovery using working and protection systems
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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
- H04B10/40—Transceivers
-
- 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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/506—Multiwavelength transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
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- 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
- H04J14/0256—Optical medium access at the optical channel layer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—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
Definitions
- the present invention relates to a communication apparatus and a carrier frequency control method for performing communication by frequency multiplexing optical signals.
- Patent Document 1 discloses a technique for transmitting from the transmitting side while reducing the optical power of the specific wavelength, and evaluating the channel crosstalk amount from the bit error rate of the adjacent channel of the specific wavelength on the receiving side. Yes. Based on the amount of channel crosstalk, a shift in the wavelength of the channel whose optical power is reduced is detected, and the wavelength shift in the channel whose optical power is reduced is compensated on the transmission side.
- the carrier frequency is controlled based on the bit error rate.
- the bit error rate may fluctuate not only due to the amount of crosstalk but also due to deterioration due to the fiber nonlinear optical effect in the transmission path. There is. For this reason, there has been a problem that accuracy is insufficient in correcting the frequency deviation.
- the present invention has been made in view of the above, and an object of the present invention is to obtain a communication device capable of controlling the carrier frequency with high accuracy.
- the present invention provides an optical transmission apparatus including a plurality of transceivers each transmitting and receiving an optical signal at a different carrier frequency, and input from the plurality of transceivers.
- the optical signal is frequency-multiplexed, and a multiplexing unit that outputs the frequency-multiplexed signal, the frequency-multiplexed signal, and the local light signal having the same frequency setting as the carrier frequency used in the controlled transceiver are mixed and interfered.
- the communication device has an effect that the carrier frequency can be controlled with high accuracy.
- FIG. 1 is a diagram illustrating a configuration example of an optical transmission system including a communication device according to a first embodiment
- FIG. 2 is a block diagram showing a configuration example of a spare transceiver according to the first embodiment.
- 1 is a block diagram showing a configuration example of a transceiver according to a first embodiment.
- 6 is a flowchart illustrating an operation of correcting the carrier wave frequency of the transceiver in the communication apparatus according to the first embodiment. It shows a state after correcting the carrier frequency f 1 to the carrier frequency f 1 'in transceiver according to the first embodiment The figure which shows the hardware constitutions of the spare transmitter-receiver concerning Embodiment 1.
- FIG. 1 is a diagram illustrating a configuration example of an optical transmission system including a communication device according to a first embodiment
- FIG. 2 is a block diagram showing a configuration example of a spare transceiver according to the first embodiment.
- 1 is a block diagram showing a configuration example of a trans
- FIG. 3 is a diagram illustrating a configuration example of an optical transmission system including a communication apparatus according to a second embodiment.
- FIG. 3 is a block diagram showing a configuration example of a spare transceiver according to the second embodiment.
- 10 is a flowchart showing an operation of controlling the carrier frequency of the transceiver to an arbitrary carrier frequency interval in the communication apparatus according to the second embodiment.
- FIG. The flowchart which shows the operation
- FIG. The figure which shows the example of the correspondence table which the frequency interval control part concerning Embodiment 2 produced.
- FIG. 10 is a diagram illustrating a configuration example of an optical transmission system including a communication apparatus according to a third embodiment.
- FIG. 1 is a diagram illustrating a configuration example of an optical transmission system 100 including communication apparatuses 1 and 3 according to a first embodiment of the present invention.
- the communication device 1 and the communication device 3 perform communication using optical signals that are frequency-multiplexed via the transmission path 2.
- the description will be made assuming an optical transmission system 100 in which four subcarriers are frequency-multiplexed, but this is an example, and the number of frequency-multiplexed subcarriers is not limited to four. Since the communication devices 1 and 3 have the same configuration, the configuration and operation will be described below using the communication device 1.
- the communication apparatus 1 includes an optical transmission apparatus 10 including four transceivers 11, 12, 13, and 14 that transmit and receive optical signals using different carrier frequencies, and optical signals input from the transceivers 11 to 14.
- a multiplexing unit 21 that outputs a frequency-multiplexed frequency multiplexed signal to the transmission line 2 and the spare transceiver 30 and a frequency multiplexed signal that is output from the communication device 3 and input via the transmission line 2 are demultiplexed into carrier frequencies.
- the multiplexing / demultiplexing unit 20 including the demultiplexing unit 22 that outputs to the corresponding transceivers 11 to 14, the frequency multiplexed signal, and the local light signal having the same frequency setting as the carrier frequency used by the controlled transceiver interference to generate a control signal for carrier frequency compensation of the control target transceiver, a spare transceiver 30 that performs control for correcting the carrier frequency f 1 ⁇ f 4 used in the transceivers 11 to 14, pre And a control unit 40 including a transmission control unit 41 for performing control of transmitting and distributes the control signal inputted from the transceiver 30 to the transceiver 11 to 14 of the controlled object, the.
- the control target transceiver is a transceiver to be controlled among the transceivers 11 to 14 to correct the carrier frequency.
- the transceiver 11 transmits and receives an optical signal at the carrier frequency f 1
- the transceiver 12 transmits and receives an optical signal at the carrier frequency f 2 with the carrier frequency f 1 and the frequency interval ⁇ F
- the transceiver 13 The optical signal is transmitted / received at the carrier frequency f 3 having the carrier frequency f 2 and the frequency interval ⁇ F
- the transmitter / receiver 14 is transmitting / receiving the optical signal at the carrier frequency f 4 having the carrier frequency f 3 and the frequency interval ⁇ F.
- the transceivers 11 to 14 of the optical transmission device 10 output optical signals having carrier frequencies f 1 to f 4 .
- the multiplexing unit 21 of the multiplexing / demultiplexing unit 20 frequency-multiplexes the optical signals input from the transmitters / receivers 11 to 14 and transmits the frequency multiplexed signal to the communication device 3 via the transmission line 2 and also performs preliminary transmission / reception from the monitor port.
- the frequency multiplexed signal is output to the unit 30.
- the demultiplexing unit 22 of the multiplexing / demultiplexing unit 20 demultiplexes the frequency multiplexed signal into the carrier frequencies f 1 to f 4 to correspond to the transceivers 11 to 14 to output.
- each of the transceivers 11 to 14 of the communication apparatus 3 transmits optical signals having carrier frequencies f 1 to f 4 as described above.
- the multiplexing unit 21 performs frequency multiplexing and transmits the result to the communication device 1.
- the demultiplexing unit 22 demultiplexes the frequency multiplexed signal into carrier frequencies f 1 to f 4 and performs corresponding transmission / reception. Output to devices 11-14.
- FIG. 2 is a block diagram showing a configuration example of the standby transceiver 30 according to the first exemplary embodiment of the present invention.
- the spare transmitter / receiver 30 modulates and transmits a wavelength tunable light source 31 that is a light source that can output a local light signal that is an optical signal by changing a carrier frequency, and a local light signal that is input from the variable wavelength light source 31.
- the optical modulation unit 32 which is a modulation unit that generates a signal, the frequency multiplexed signal input from the multiplexing unit 21 of the multiplexing / demultiplexing unit 20 and the local light signal input from the wavelength variable light source unit 31 are mixed and interfered.
- the extracted optical signal is converted into an electrical signal for calculating the frequency offset amount, and the demultiplexed optical signal input from the demultiplexing unit 22 of the multiplexing / demultiplexing unit 20 and the wavelength variable light source unit 31 are input.
- a coherent receiver 33 which is a synchronous detection unit that converts an optical signal extracted by mixing interference with a local light signal into an electric signal for data demodulation, and an electric signal for calculating a frequency offset amount converted by the coherent receiver 33. for
- digital signal processing a frequency offset amount between the carrier frequency of the transmission / reception device to be controlled and the carrier frequency of the local light emission signal is calculated, and a control signal that is information on the frequency offset amount is generated and sent to the control unit 40.
- a digital signal processing unit 34 which is a signal processing unit that outputs and compensates for signal deterioration by digital signal processing using the electrical signal for data demodulation converted by the coherent receiver 33 and demodulates the original data; .
- the local light signal output from the wavelength variable light source unit 31 is branched into two and used as a light source in the light modulator 32 and a light source in the coherent receiver 33.
- the process of restoring the original data from the optical signal after the demultiplexing in the coherent receiver 33 and the digital signal processing unit 34 is the same as the data restoration process using the conventionally used digital coherent reception technique.
- the coherent receiver 33 and the digital signal processing unit 34 obtain a frequency offset amount between the carrier frequency of the optical signal on which the data to be restored and the carrier frequency of the local light signal are superimposed, and obtain information on the frequency offset amount. Used for data restoration processing. Therefore, in the coherent receiver 33 and the digital signal processing unit 34 according to the present embodiment, the frequency offset can be obtained by using the calculation function that has been performed in the conventional data restoration process without adding a new calculation function. The amount can be determined.
- FIG. 3 is a block diagram illustrating a configuration example of the transceiver 11 according to the first embodiment of the present invention.
- the transceiver 11 includes a wavelength tunable light source 51 that can output a local light signal that is an optical signal by changing a carrier frequency based on a control signal input from the control unit 40, and a station that is input from the wavelength tunable light source 51.
- An optical modulation unit 52 that is a modulation unit that modulates a light emission signal to generate a transmission signal, an optical signal after demultiplexing input from the demultiplexing unit 22 of the multiplexing / demultiplexing unit 20, and a wavelength variable light source unit 51.
- the coherent receiver 53 which is a synchronous detection unit that converts an optical signal extracted by mixing interference with the local light signal, into an electric signal, and the electric signal converted by the coherent receiver 53, the signal is obtained by digital signal processing.
- a digital signal processing unit 54 that is a signal processing unit that compensates for the degradation and demodulates the original data.
- the local light signal output from the wavelength tunable light source unit 51 is branched into two and used as a light source in the light modulation unit 52 and a light source in the coherent receiver 53.
- the spare transceiver 30 since the spare transceiver 30 has the same configuration as the transceivers 11 to 14, in the optical transmission apparatus 10, when any of the transceivers 11 to 14 fails, the spare transceiver 30 fails. It can be used with a transceiver that is an alternative to the transceiver that has been used.
- FIG. 4 is a flowchart showing an operation of correcting the carrier wave frequencies of the transceivers 11 to 14 in the communication device 1 according to the first embodiment of the present invention.
- the transceivers 11 to 14 transmit optical signals at the respective carrier frequencies f 1 to f 4 (step S1). At this time, since the carrier wave frequencies f 1 to f 4 of the optical signals transmitted from the transceivers 11 to 14 are generated by the separate wavelength variable light source units 51 included in the respective transceivers 11 to 14, the frequency shift of the order of GHz is achieved. May be included.
- the multiplexing unit 21 frequency-multiplexes each optical signal input from the transceivers 11 to 14, transmits the frequency-multiplexed signal to the communication device 3 via the transmission path 2, and transmits the frequency-multiplexed signal from the monitor port to the spare transceiver. 30 (step S2).
- the coherent receiver 33 receives the frequency multiplexed signal output from the multiplexing unit 21.
- the carrier frequency f 1 ′ is set to the same frequency setting as the carrier frequency f 1 used in the transmitter / receiver 11, but due to individual differences between the wavelength variable light source unit 51 of the transmitter / receiver 11 and the wavelength variable light source unit 31 of the standby transmitter / receiver 30. It is assumed that errors in the order of GHz may be included.
- the coherent receiver 33 mixes and interferes with the frequency multiplexed signal and the local light signal that is the local light signal of the carrier frequency f 1 ′ input from the wavelength variable light source unit 31 (step S 5).
- the coherent receiver 33 converts the optical signal extracted by mixing interference into an electrical signal for calculating the frequency offset amount, and outputs the electrical signal to the digital signal processing unit 34.
- the digital signal processing unit 34 uses the electric signal input from the coherent receiver 33 to perform digital signal processing, and the carrier frequency f 1 of the controlled transmitter / receiver 11 and the carrier frequency f of the local light signal.
- a frequency offset amount ⁇ f 1 which is a frequency shift amount from 1 ′, is calculated (step S 6).
- the digital signal processing unit 34 outputs the information of the calculated frequency offset amount ⁇ f 1 as a control signal for the transceiver 11 to the control unit 40.
- the transmission control unit 41 outputs the control signal for the transceiver 11 input from the digital signal processing unit 34 to the transceiver 11 to be controlled (step S7).
- variable wavelength light source unit 51 controls the carrier frequency by the frequency offset amount ⁇ f 1 based on the control signal for the transmitter / receiver 11 input from the control unit 40, and sets the carrier frequency f 1 . Correction is made to the carrier frequency f 1 ′ (step S8).
- Figure 5 is a diagram showing a state after correcting the carrier frequency f 1 in the transceiver 11 according to the first embodiment to the carrier frequency f 1 '.
- the carrier frequencies f 1 ′ to f 4 ′ are carrier frequencies that are originally used without considering the error of the wavelength variable light source unit 51 in the transceivers 11 to 14.
- the carrier frequencies f 1 ′ to f 4 ′ have a relationship between the adjacent carrier frequency and the frequency interval ⁇ F when there is no frequency shift.
- the frequency interval ⁇ F can be maintained between the carrier frequency f 2 ′ and the carrier frequency f 2 ′.
- the standby transmitter / receiver 30 repeats the operations from steps S4 to S8, calculates the frequency offset amount ⁇ f 3 of the transmitter / receiver 13 and performs control to correct the carrier frequency f 3 of the transmitter / receiver 13 to the carrier frequency f 3 ′. Then, control is performed to calculate the frequency offset amount ⁇ f 4 of the transmitter / receiver 14 and correct the carrier frequency f 4 of the transmitter / receiver 14 to the carrier frequency f 4 ′.
- step S 9 when calculation of the frequency offset amount of the carrier frequencies f 1 ′ to f 4 ′ is completed for all the transceivers 11 to 14 included in the optical transmission device 10 (step S 9: Yes), the carrier frequency is corrected. To finish the operation.
- frequency multiplexed signals ⁇ f 1 to ⁇ f 4 of the carrier frequencies f 1 to f 4 of the transceivers 11 to 14 are calculated by inputting a frequency multiplexed signal from the monitor port of the multiplexing unit 21. Therefore, even when the optical transmission system 100 is in operation, the carrier frequency can be controlled in real time.
- the wavelength variable light source units 31 and 51 detect frequency information using an optical filter having a periodic wavelength transmission characteristic, and stably control the oscillation frequency.
- the wavelength variable light source units 31 and 51 cause a wavelength shift in transmission characteristics due to a temperature variation or the like, but the period shift amount is less than 1/1000 of the absolute value shift amount. Therefore, the communication device 1, at a temperature stable environment, that with respect to the one wavelength variable light source unit 31 corrects the carrier frequency f 1 ⁇ f 4 of transceivers 11-14, the carrier frequency f 1 It is possible to control the frequency interval ⁇ F of .about.f 4 on the order of 50 MHz or less.
- the communication device 1 constantly monitors the frequency multiplexed signals and controls the carrier frequencies f 1 to f 4 of the transmitters / receivers 11 to 14, so that the frequency of each wavelength variable light source unit 51 of the transmitter / receivers 11 to 14 is aged. The deviation can be detected, and the frequency interval ⁇ F between the carrier frequencies f 1 to f 4 can be stably controlled.
- the digital signal processing unit 34 of the standby transceiver 30 periodically calculates the frequency offset amounts ⁇ f 1 to ⁇ f 4 of the transceivers 11 to 14, and periodically the carrier waves of the transceivers 11 to 14. The frequencies f 1 to f 4 are corrected.
- FIG. 6 is a diagram illustrating a hardware configuration of the spare transceiver 30 according to the first embodiment.
- the wavelength tunable light source unit 31 is realized by a processor that executes a program stored in the memory 62 and an optical signal generation unit 63.
- the light modulation unit 32 is realized by a processor that executes a program stored in the memory 62 and an output unit 65.
- the coherent receiver 33 is realized by a processor that executes a program stored in the memory 62 and an input unit 64.
- the digital signal processing unit 34 is realized by a processor that executes a program stored in the memory 62 and an output unit 65.
- the processor 61, the memory 62, the optical signal generation unit 63, the input unit 64, and the output unit 65 are connected by a system bus 66.
- a plurality of processors 61 and a plurality of memories 62 may cooperate to execute the functions of the components shown in the block diagram of FIG. 2.
- the spare transceiver 30 can be realized by the hardware configuration shown in FIG. 6, but can be implemented by either software or hardware.
- each transmitter / receiver of the optical transmission device 10 is based on the carrier frequency of the wavelength tunable light source unit 31 as one reference provided in the standby transmitter / receiver 30.
- the carrier frequencies f 1 to f 4 of 11 to 14 are corrected.
- the communication apparatus 1 can control the carrier frequencies f 1 to f 4 of the transceivers 11 to 14 with high accuracy by utilizing the periodic characteristics of the wavelength tunable light source 31 and the frequency offset estimation function by digital signal processing.
- the carrier frequencies f 1 to f 4 can be arranged with high accuracy on the order of 50 MHz or less at a frequency interval ⁇ F.
- the communication device 1 does not require transmission / reception of an optical signal with another communication device 3 in the correction of the carrier frequencies f 1 to f 4 of each of the transceivers 11 to 14, Control can be performed.
- the communication apparatus 1 it is not necessary to quench each carrier frequency even during operation of the optical transmission system 100, so that the carrier frequency can be controlled in real time and the optical frequency shift due to the aging of the wavelength variable light source 51 can be corrected.
- Embodiment 2 the frequency intervals of a plurality of carrier frequencies are controlled to arbitrary frequency intervals. A different part from Embodiment 1 is demonstrated.
- FIG. 7 is a diagram illustrating a configuration example of an optical transmission system 100a including the communication devices 1a and 3a according to the second embodiment of the present invention.
- the communication device 1 a and the communication device 3 a communicate with each other through an optical signal that is frequency-multiplexed via the transmission path 2. Since the communication devices 1a and 3a have the same configuration, the configuration and operation will be described below using the communication device 1a.
- the communication device 1a includes an optical transmission device 10 including transceivers 11 to 14 that transmit and receive optical signals at different carrier frequencies, a standby transmitter and receiver 30a that receives optical signals, and an optical signal that is transmitted by a control target transceiver. And a control unit 40a for controlling the carrier frequency of the signal.
- the spare transceiver 30 and the control unit 40 are deleted from the communication device 1 of the first embodiment, and the spare transceiver 30a and the control unit 40a are added.
- FIG. 8 is a block diagram showing a configuration example of the spare transceiver 30a according to the second embodiment of the present invention.
- the standby transmitter / receiver 30a is obtained by deleting the wavelength tunable light source unit 31 from the standby transmitter / receiver 30 of the first embodiment and adding the wavelength tunable light source unit 31a.
- the wavelength tunable light source unit 31a performs the same operation as the wavelength tunable light source unit 31, and in the second embodiment, the carrier frequency is changed by a control signal from the control unit 40a described later. It is a light source unit capable of outputting a local light signal that is an optical signal.
- the spare transceiver 30a similarly to the spare transceiver 30 of the first embodiment, the spare transceiver 30a has the same configuration as the transceivers 11 to 14, and therefore, in the optical transmission apparatus 10, any one of the transceivers 11 to 14 is provided. In the event of a failure, the spare transmitter / receiver 30a can be used as a transmitter / receiver in place of the failed transmitter / receiver.
- the control unit 40 a includes a transmission control unit 41 a and a frequency interval control unit 42.
- the transmission control unit 41a performs the same operation as that of the transmission control unit 41.
- the transmission control unit 41a uses the carrier frequencies f 1-
- the operations of the transmitters / receivers 11 to 14 and the spare transmitter / receiver 30a are controlled so that f 4 is an arbitrary carrier frequency interval.
- Frequency interval control unit 42, the carrier frequency f 1 ⁇ f 4 used in the transceivers 11 to 14 accepts the setting for any carrier frequency interval are used in each carrier frequency f 1 ⁇ f 4
- the channel number and frequency offset amount are calculated.
- the wavelength tunable light source unit 31a incorporated in the standby transmitter / receiver 30a is used as a reference light source that outputs a local light signal serving as reference light, and the carrier frequencies of the transmitters / receivers 11 to 14 are set at arbitrary carrier frequency intervals.
- the control for arranging the optical signals with high accuracy will be described below.
- an optical signal is arranged at an arbitrary carrier frequency interval by calculating a channel number used in the reference wavelength variable light source unit 31a and a frequency shift amount from the frequency grid in the channel number. be able to.
- the wavelength variable light source unit 31a of the spare transceiver 30a emits light at a frequency interval of 25 GHz grid and has a frequency shift width of ⁇ 12.5 GHz.
- a frequency interval of 25 GHz grid means that the frequency difference of the optical signal is 25 GHz in adjacent channel numbers.
- the variable wavelength light source 51 of the transmitters / receivers 11 to 14 and the variable wavelength light source 31a of the standby transmitter / receiver 30a have the same specifications.
- FIG. 9 is a flowchart showing an operation of controlling the carrier frequencies of the transceivers 11 to 14 to an arbitrary carrier frequency interval in the communication device 1a according to the second embodiment of the present invention.
- the frequency interval control unit 42 transmits an optical signal transmitted from each wavelength variable light source unit 51 of the target transceivers 11 to 14 in the optical transmission system 100a from an administrator of the optical transmission system 100a or the like.
- the setting of the carrier frequency interval A and the number of wavelengths N is accepted (step S11).
- the carrier frequency interval A is 40 GHz
- FIG. 10 is a diagram illustrating an image of a method of controlling the carrier frequency interval in the communication device 1a according to the second embodiment.
- the wavelength variable light source unit 31a and the wavelength variable light source units 51 of the transceivers 11 to 14 emit light with a frequency interval of 25 GHz as described above.
- a transmitter / receiver that transmits at an adjacent carrier frequency has a frequency interval 50 GHz larger that is two intervals of a frequency interval 25 GHz grid.
- the frequency is set to the wavelength variable light source unit 51, and the frequency is shifted so as to reduce the frequency interval by 10 GHz according to the correction instruction based on the comparison with the local light emission signal of the spare transceiver 30a.
- the frequency interval control unit 42 When receiving the setting of the carrier frequency interval A and the number of wavelengths N, the frequency interval control unit 42 receives the channel number C of each optical signal arranged for each carrier frequency f n and the frequency f Cn by the set channel number C.
- a frequency offset amount ⁇ F n which is a frequency shift amount with respect to ′, which is a first frequency offset amount, is calculated, and a correspondence table indicating a channel number C and a frequency offset amount ⁇ F n for each carrier frequency f n is created (step S12). Note that the handling of “′” given to each frequency is the same as in the first embodiment.
- FIG. 11 is a flowchart illustrating an operation of creating a correspondence table in the frequency interval control unit 42 according to the second embodiment.
- Frequency interval control unit 42 calculates the channel number C of frequency closest wavelength tunable light source unit 31a to the carrier frequency f 1 (step S32).
- the carrier frequency f 1 is the smallest frequency in the light signal to be frequency-multiplexed
- the channel number C 1 the frequency of the closest wavelength tunable light source unit 31a to the carrier frequency f 1.
- ⁇ F 1 is calculated (step 33).
- the frequency interval control unit 42 calculates the channel number C and the frequency offset amounts ⁇ F 3 and ⁇ F 4 for the carrier frequencies f 3 and f 4 and completes the correspondence table.
- the frequency interval control unit 42 ends the correspondence table creation operation.
- the frequency interval control unit 42 stores the created correspondence table inside the frequency interval control unit 42, but may store it in a storage unit (not shown) outside the frequency interval control unit 42.
- FIG. 12 is a diagram illustrating an example of a correspondence table created by the frequency interval control unit 42 according to the second embodiment.
- the correspondence table shows the channel number C and the frequency offset amount ⁇ F n for each of the carrier frequencies f 1 to f 4 .
- the frequency offset amount ⁇ F 2 ⁇ 10 GHz.
- the frequency offset amount ⁇ F 3 5 GHz.
- the frequency interval between the carrier frequency f 2 and the carrier frequency f 3 is between the carrier frequency f 1 and the carrier frequency f 2 from the frequency interval 80 GHz between the carrier frequency f 1 and the carrier frequency f 3 .
- 80 ⁇ 40 40 (GHz) obtained by subtracting the frequency interval of 40 GHz.
- the frequency interval between the carrier frequency f 3 and the carrier frequency f 4 is between the carrier frequency f 1 and the carrier frequency f 3 from the frequency interval 120 GHz between the carrier frequency f 1 and the carrier frequency f 4 .
- 120 ⁇ 80 40 (GHz) obtained by subtracting the frequency interval of 80 GHz.
- the transmission control unit 41a starts a process of controlling the frequency intervals of the carrier frequencies f 1 to f 4 of the transceivers 11 to 14. .
- the coherent receiver 33 receives the optical signal of the carrier frequency f 1 of the transmitter / receiver 11 that is output from the monitor port of the multiplexing unit 21, and the carrier frequency f 1 ′ input from the wavelength variable light source unit 31a.
- Mixed interference with the local light emission signal step S17.
- the coherent receiver 33 converts the optical signal extracted by mixing interference into an electrical signal for calculating the frequency offset amount, and outputs the electrical signal to the digital signal processing unit 34.
- the digital signal processing unit 34 uses the electrical signal input from the coherent receiver 33 to calculate the frequency offset amount ⁇ f 1 that is the second frequency offset amount by digital signal processing (step S18). ). The digital signal processing unit 34 outputs the information of the calculated frequency offset amount ⁇ f 1 as a control signal for the transceiver 11 to the control unit 40a.
- the transmission control unit 41a compares the frequency offset amount ⁇ f 1 based on the control signal input from the digital signal processing unit 34 with the frequency offset amount ⁇ F 1 acquired from the correspondence table shown in FIG. S19).
- step S19: No When the error between the frequency offset amount ⁇ f 1 and the frequency offset amount ⁇ F 1 is within the range of ⁇ 0.01 GHz, that is, when the frequency offset amount ⁇ f 1 is not within the range of 0 ⁇ 0.01 GHz (step S19: No), transmission is performed.
- the control unit 41a generates a control signal for causing the transceiver 11 to correct the carrier frequency f 1 of the optical signal by ⁇ F 1 - ⁇ f 1 and outputs the control signal to the transceiver 11 to be controlled (step S20).
- the error range of ⁇ 0.01 GHz is merely an example, and the present invention is not limited to this. Different values may be used depending on the application and purpose of the optical transmission system 100a.
- variable wavelength light source unit 51 corrects the carrier frequency f 1 by the frequency offset amount ⁇ F 1 - ⁇ f 1 based on the control signal for the transmitter / receiver 11 generated by the transmission control unit 41a (Ste S21).
- the communication device 1a returns to step S15, and repeatedly executes the processing from step S15 to step S21 until the error between the frequency offset amount ⁇ f 1 and the frequency offset amount ⁇ F 1 falls within the range of ⁇ 0.01 GHz.
- the transmission control unit 41a checks whether or not adjustment has been completed for all the transceivers (step S22).
- step S22 No
- the communication device 1a performs the operations from step S14 to step S21, calculates the frequency offset amount ⁇ f 2 of the transmitter / receiver 12, and controls to correct the carrier frequency f 2 of the transmitter / receiver 12.
- it is controlled to be within a range of ⁇ 10 ⁇ 0.01 GHz.
- the transmission control unit 41a is a frequency offset Delta] f 2 by the control signal inputted from the digital signal processing unit 34 compares the frequency offset [Delta] F 2, the frequency offset Delta] f 2 and the frequency offset [Delta] F 2 is within the range of ⁇ 0.01 GHz, that is, when the frequency offset amount ⁇ f 2 does not fall within the range of ⁇ 10 ⁇ 0.01 GHz, the transmission control unit 41a transmits the optical signal carrier to the transceiver 11. A control signal for correcting the frequency f 2 by ⁇ F 2 ⁇ f 2 is generated and output to the transceiver 12.
- An optical signal having a frequency higher by about 40 GHz is transmitted.
- the communication device 1a performs operations from step S14 to step S21 for the carrier frequencies f 3 and f 4 to control the carrier frequency interval, and when the adjustment of the carrier frequency is completed for all the transceivers (step) S22: Yes), the operation of controlling to an arbitrary carrier frequency interval is terminated.
- the digital signal processing unit 34 generates a control signal similar to that in the first embodiment, and the frequency based on the control signal acquired by the transmission control unit 41a of the control unit 40a from the digital signal processing unit 34.
- the offset amount ⁇ f n is compared with the frequency offset amount ⁇ F n acquired from the frequency interval control unit 42, and the control signal is generated and output based on the comparison result.
- the present invention is not limited to this.
- the transmission control unit 41a outputs information on the frequency offset amount ⁇ F n acquired from the frequency interval control unit 42 to the digital signal processing unit 34 by a control signal, and the digital signal processing unit 34 calculates the calculated frequency offset amount ⁇ f n .
- the frequency offset amount ⁇ F n acquired from the frequency interval control unit 42 may be compared and a control signal may be generated based on the comparison result.
- the transmission control unit 41a outputs the control signal for the transmitter / receiver input from the digital signal processing unit 34 to the transceiver to be controlled, as in the first embodiment.
- the transmission control unit 41a may output information on the frequency offset amount ⁇ F n acquired from the frequency interval control unit 42 to the transceivers 11 to 14 by a control signal.
- the transceivers 11 to 14 correct the frequency offset amount ⁇ F n from the beginning and output an optical signal, so that the communication device 1 a uses the information on the frequency offset amount ⁇ F n acquired from the frequency interval control unit 42 as the transceiver 11. Compared with the case where the signal is not output to -14, the operation of controlling to an arbitrary carrier frequency interval can be completed in a short time.
- the hardware configuration of the spare transceiver 30a shown in FIG. 8 can be realized by the same hardware configuration as that of the first embodiment shown in FIG.
- the control unit 40a including the transmission control unit 41a and the frequency interval control unit 42 can be realized by the processor 61 and the memory 62 shown in FIG.
- optical signals transmitted from the transmitters / receivers 11 to 14 are arbitrarily selected based on the carrier frequency of the wavelength tunable light source unit 31a included in the standby transmitter / receiver 30a. It was decided to arrange at a carrier frequency interval of. Thereby, in the optical transmission system 100a, the carrier frequency interval can be adjusted with high accuracy, and a flexible carrier frequency interval suitable for the system can be realized. Since the communication device 1a uses the fine frequency adjustment function of the wavelength tunable light source unit 51 of the transceivers 11 to 14 and the wavelength tunable light source unit 31a of the standby transceiver 30a, it is not limited to the grid of each wavelength tunable light source unit.
- the carrier waves can be arranged at the carrier frequency intervals. Further, in the communication device 1a, the carrier wave can be controlled to the designated frequency, and the frequency control can be performed with high accuracy of 100 MHz or less.
- Embodiment 3 In the second embodiment, the case where optical signals that are four subcarriers are arranged at a frequency interval of 40 GHz has been described.
- the frequency interval of the optical signal is not constant and varies depending on the frequency band, specifically, wavelength number 1 in which four optical signals are frequency-multiplexed at a frequency interval of 40 GHz, and three optical signals are frequency intervals.
- wavelength number 2 frequency-multiplexed at 33.3 GHz is frequency-multiplexed at a frequency interval of 50 GHz.
- FIG. 13 is a diagram illustrating a configuration example of an optical transmission system 100b including the communication devices 1b and 3b according to the third embodiment of the present invention.
- the communication device 1b and the communication device 3b communicate with each other through an optical signal that is frequency-multiplexed via the transmission path 2. Since the communication devices 1b and 3b have the same configuration, the configuration and operation will be described below using the communication device 1b.
- the communication device 1b is obtained by deleting the optical transmission device 10 from the communication device 1a of the second embodiment and adding the optical transmission device 10a.
- the optical transmission device 10a includes transceivers 11-17.
- the optical transmission device 10a has a configuration in which transceivers 15 to 17 are added to the optical transmission device 10.
- the configurations of the transceivers 15 to 17 are the same as those of the transceivers 11 to 14.
- FIG. 14 is a diagram illustrating an image of a method of controlling the carrier frequency interval in the communication device 1b according to the third embodiment.
- the carrier frequency f 1 to f 4 of wavelength number 1 corresponds to the transceivers 11 to 14, and the carrier frequency f 5 to f 7 of wavelength number 2 corresponds to the transceivers 15 to 17. That is, the part of wavelength number 1 is the same as that of the second embodiment.
- the flowchart of the operation in which the communication device 1b controls the carrier frequency of the transceivers 11 to 17 to an arbitrary carrier frequency interval is the same as the flowchart of FIG. 9 in the second embodiment.
- the difference from the second embodiment is that the carrier frequency interval A and the number of wavelengths N set in step S11 and the correspondence table created in step S12 correspond to the seven carrier frequencies f 1 to f 7 .
- FIG. 15 is a diagram illustrating an example of a correspondence table created by the frequency interval control unit 42 according to the third embodiment.
- the portions of the carrier wave frequencies f 1 to f 4 are the same as those in FIG. 12 in the second embodiment.
- the frequency offset amount ⁇ F 5 ⁇ 5 GHz.
- the frequency interval between the carrier frequency f 4 and the carrier frequency f 5 is between the carrier frequency f 1 and the carrier frequency f 4 from the frequency interval 170 GHz between the carrier frequency f 1 and the carrier frequency f 5 .
- 170 ⁇ 120 50 (GHz) obtained by subtracting the frequency interval of 120 GHz.
- frequency offset amount ⁇ F 6 3.3 GHz.
- the frequency interval between the carrier frequency f 1 and the carrier frequency f 6 is 203.3 GHz.
- the frequency offset amount ⁇ F 7 11.6 GHz.
- the frequency interval between the carrier frequency f 1 and the carrier frequency f 7 is 236.6 GHz.
- the frequency interval between the carrier frequency f 6 and the carrier frequency f 7 is from the frequency interval 236.6 GHz between the carrier frequency f 1 and the carrier frequency f 7 to the carrier frequency f 1 and the carrier frequency f 6 .
- the carrier frequency f 1 which is the minimum frequency among the optical signals to be frequency-multiplexed
- the arrangement of each optical signal can be defined by the distance from the reference frequency. Therefore, even in a system in which the frequency interval is different depending on the frequency band, it is possible to flexibly control the frequency interval to be different.
- step S22 No, the number of times of returning to step S14 via step S23 increases by 3 times 15 to 17 times of the transmitter / receiver.
- optical signals transmitted from the transmitters / receivers 11 to 17 are arbitrarily selected based on the carrier frequency of the wavelength tunable light source unit 31a included in the standby transmitter / receiver 30a. It was decided to arrange at a carrier frequency interval of. Thereby, in the optical transmission system 100b, the effect similar to Embodiment 2 can be acquired, and also a carrier frequency interval can be made into a different space
- the configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.
- 1, 1a, 1b, 3, 3a, 3b communication device 2 transmission path, 10 optical transmission device, 11, 12, 13, 14, 15, 16, 17 transceiver, 20 multiplexing / demultiplexing unit, 21 multiplexing unit, 22 demultiplexing unit, 30, 30a standby transmitter / receiver, 31, 31a, 51 tunable light source unit, 32, 52 light modulation unit, 33, 53 coherent receiver, 34, 54 digital signal processing unit, 40, 40a control unit, 41 , 41a transmission control unit, 42 frequency interval control unit, 61 processor, 62 memory, 63 optical signal generation unit, 64 input unit, 65 output unit, 66 system bus, 100, 100a, 100b optical transmission system.
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Abstract
Description
図1は、本発明の実施の形態1にかかる通信装置1,3を含む光伝送システム100の構成例を示す図である。光伝送システム100では、通信装置1および通信装置3が、伝送路2を介して周波数多重した光信号により通信を行っている。ここでは、4つのサブキャリアを周波数多重した光伝送システム100を想定して説明するが、一例であり、周波数多重するサブキャリアの数は4つに限定するものではない。通信装置1,3は同一構成のため、以降、通信装置1を用いて構成および動作を説明する。
実施の形態2では、複数の搬送波周波数の周波数間隔を任意の周波数間隔に制御する。実施の形態1と異なる部分について説明する。
実施の形態2では、4つのサブキャリアである光信号を周波数間隔40GHzで配置する場合について説明した。本実施の形態では、光信号の周波数間隔が一定ではなく、周波数帯によって異なる場合、具体的に、4つの光信号を周波数間隔40GHzで周波数多重した波長番号1と、3つの光信号を周波数間隔33.3GHzで周波数多重した波長番号2とを周波数間隔50GHzで周波数多重する場合について説明する。
Claims (8)
- 各々が異なる搬送波周波数で光信号を送受信する複数の送受信器を備えた光伝送装置と、
前記複数の送受信器より入力された光信号を周波数多重し、周波数多重信号を出力する合波部と、
前記周波数多重信号と、制御対象送受信器で使用される搬送波周波数と同じ周波数設定の局発光信号とを混合干渉して前記制御対象送受信器の搬送波周波数補正用の制御信号を生成して出力する、前記複数の送受信器の予備の送受信器である予備送受信器と、
前記予備送受信器より入力された前記制御信号を前記制御対象送受信器へ出力する制御を行う制御部と、
を備えることを特徴とする通信装置。 - 前記予備送受信器は、
搬送波周波数を変えて前記局発光信号を出力可能な光源部と、
前記周波数多重信号と前記局発光信号とを混合干渉して抽出された光信号を電気信号に変換する同期検波部と、
前記電気信号を用いて、前記制御対象送受信器で使用される搬送波周波数と、前記制御対象送受信器で使用される搬送波周波数と同じ周波数設定で前記光源部から出力された前記局発光信号の搬送波周波数との周波数オフセット量を算出し、前記周波数オフセット量の情報を前記制御信号とし、前記制御部へ出力する信号処理部と、
を備えることを特徴とする請求項1に記載の通信装置。 - 前記信号処理部は、前記複数の送受信器について周期的に前記周波数オフセット量を算出する、
ことを特徴とする請求項2に記載の通信装置。 - 前記予備送受信器は、前記局発光信号を変調する変調部を備え、前記複数の送受信器のうちの1つに代わって光信号の送受信をすることができる、
ことを特徴とする請求項2または3に記載の通信装置。 - 各々が異なる搬送波周波数で光信号を送受信する複数の送受信器を備えた光伝送装置と、前記複数の送受信器から出力された光信号が周波数多重された周波数多重信号を用いて制御対象送受信器の搬送波周波数補正用の制御信号を生成する、前記複数の送受信器の予備の送受信器である予備送受信器と、を備えた通信装置の搬送波周波数制御方法であって、
前記光伝送装置の各送受信器が、異なる搬送波周波数で光信号を送信する光信号送信ステップと、
合波部が、前記各送受信器より入力された光信号を周波数多重し、周波数多重信号を出力する周波数多重ステップと、
前記予備送受信器の光源部が、前記制御対象送受信器で使用される搬送波周波数と同じ周波数設定の搬送波周波数の局発光信号を出力する局発光信号出力ステップと、
前記予備送受信器の同期検波部が、前記周波数多重信号と前記局発光信号とを混合干渉して抽出された光信号を電気信号に変換する混合干渉ステップと、
前記予備送受信器の信号処理部が、前記電気信号を用いて、前記制御対象送受信器で使用される搬送波周波数と、前記制御対象送受信器で使用される搬送波周波数と同じ周波数設定で前記光源部から出力された前記局発光信号の搬送波周波数との周波数オフセット量を算出し、算出した周波数オフセット量の情報を制御信号とし、出力する周波数オフセット量算出ステップと、
前記制御対象送受信器が、前記制御信号に基いて搬送波周波数を補正する補正ステップと、
を含むことを特徴とする搬送波周波数制御方法。 - 前記通信装置では、前記複数の送受信器について、周期的に前記周波数オフセット量を算出し、搬送波周波数を補正する、
ことを特徴とする請求項5に記載の搬送波周波数制御方法。 - 前記制御部は、前記複数の送受信器から送信される光信号の搬送波周波数の周波数間隔および前記送受信器の数である波長数の設定を受け付け、前記複数の送受信器が備える規定の周波数グリッドで搬送波周波数を変えて前記光信号を出力可能な光源部について、前記設定に基いて、各送受信器の前記光源部で使用されるチャネル番号および第1の周波数オフセット量を算出し、前記第1の周波数オフセット量と前記信号処理部からの制御信号で示される第2の周波数オフセット量とを比較し、前記第1の周波数オフセット量と前記第2の周波数オフセット量との誤差が規定された範囲内にないときは、前記制御対象送受信器に対して前記光信号の搬送波周波数を補正するための制御信号を生成して出力し、
前記制御対象送受信器の光源部が、前記制御部で生成された制御信号に基いて前記光信号の搬送波周波数を補正する、
ことを特徴とする請求項2,3または4に記載の通信装置。 - 各々が異なる搬送波周波数で光信号を送受信する複数の送受信器を備えた光伝送装置と、前記複数の送受信器の予備の送受信器であって前記光信号を受信する予備送受信器と、制御対象送受信器が送信する前記光信号の搬送波周波数を制御する制御部と、を備えた通信装置の搬送波周波数制御方法であって、
前記制御部が、前記複数の送受信器から送信される各光信号の搬送波周波数の周波数間隔および前記送受信器の数である波長数の設定を受け付ける設定ステップと、
前記制御部が、前記複数の送受信器が備える規定の周波数グリッドで搬送波周波数を変えて前記光信号を出力可能な光源部について、前記設定に基いて、各送受信器の前記光源部で使用されるチャネル番号および第1の周波数オフセット量を算出する算出ステップと、
前記制御対象送受信器の光源部が、前記チャネル番号により光信号を出力する光信号出力ステップと、
前記予備送受信器の光源部が、前記制御対象送受信器の光源部で使用されるチャネル番号と同じチャネル番号の設定で局発光信号を出力する局発光信号出力ステップと、
前記予備送受信器の同期検波部が、前記光信号と前記局発光信号とを混合干渉して抽出された光信号を電気信号に変換する混合干渉ステップと、
前記予備送受信器の信号処理部が、前記電気信号を用いて、前記制御対象送受信器が送信する光信号の搬送波周波数、および前記局発光信号の搬送波周波数との第2の周波数オフセット量を算出する周波数オフセット量算出ステップと、
前記制御部が、前記第1の周波数オフセット量と前記第2の周波数オフセット量とを比較し、前記第1の周波数オフセット量と前記第2の周波数オフセット量との誤差が規定された範囲内にないときは、前記制御対象送受信器に対して前記光信号の搬送波周波数を補正するための制御信号を生成して出力する制御ステップと、
前記制御対象送受信器の光源部が、前記制御部で生成された制御信号に基いて前記光信号の搬送波周波数を補正する補正ステップと、
を含むことを特徴とする搬送波周波数制御方法。
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US20170222727A1 (en) | 2017-08-03 |
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US10027421B2 (en) | 2018-07-17 |
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