WO2007036988A1 - 光信号分離装置および光信号分離方法 - Google Patents
光信号分離装置および光信号分離方法 Download PDFInfo
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- WO2007036988A1 WO2007036988A1 PCT/JP2005/017780 JP2005017780W WO2007036988A1 WO 2007036988 A1 WO2007036988 A1 WO 2007036988A1 JP 2005017780 W JP2005017780 W JP 2005017780W WO 2007036988 A1 WO2007036988 A1 WO 2007036988A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/08—Time-division multiplex systems
- H04J14/086—Medium access
-
- 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
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0602—Systems characterised by the synchronising information used
- H04J3/0605—Special codes used as synchronising signal
Definitions
- the present invention relates to an optical signal demultiplexer that demultiplexes an optical signal multiplexed by an optical time division method.
- OT DM Optical Time Division Multiplex
- This OTDM multiplexes optical signals at a timing specified in advance when multiplexing optical signals. Even when the multiplexed optical signal is separated, the multiplexed light is separated at a predetermined timing. In this way, by using the OTDM to multiplex and demultiplex the optical signal as it is, it is possible to realize an efficient and economical large capacity network.
- Patent Document 1 when an optical signal passes through each node constituting the optical fiber communication system, the delay of the optical signal caused by the optical path difference in the node is dispersed with respect to the wavelength of the optical fiber.
- a technology that enables precise synchronization of an optical signal related to an optical fiber communication system by utilizing and compensating the dependency has been disclosed.
- Patent Document 1 Japanese Patent Laid-Open No. 7-221708
- the present invention has been made in view of the above, and processes an optical signal as light and
- An object of the present invention is to provide an optical signal separation device capable of realizing advanced processing such as electrical signals as light.
- the present invention provides an optical signal demultiplexer that demultiplexes an optical signal multiplexed by an optical time division method, A multiplexed optical signal and a synchronization pattern are received, and based on the synchronization pattern, demultiplexing means for demultiplexing the optical signal, and a chirp is generated in the optical signal demultiplexed by the demultiplexing means And pulse width expanding means for expanding the pulse width of the optical signal by passing the optical signal generated by the chirp through a wavelength dispersion medium.
- An optical signal separation device receives an optical signal multiplexed by an optical time division method, extracts a synchronization pattern for the optical signal, and extracts an optical signal based on the extracted synchronization pattern. Demultiplexing, generating a chirp in the demultiplexed optical signal, and passing the chirped optical signal through the chromatic dispersion medium to expand the pulse width of the optical signal, so that the optical signal can be adjusted as light, and the electrical signal It is possible to perform advanced processing at a level.
- FIG. 1 is an explanatory diagram for explaining an OTDM network configuration that cannot be realized by a conventional optical multiplexing apparatus and optical division apparatus.
- FIG. 2 is a functional block diagram of the configuration of the light splitting device according to the first embodiment.
- FIG. 3 is a functional block diagram showing a configuration of a pulse length expansion unit.
- Fig. 4 is a functional block diagram showing the configuration of a pulse length extension unit using a wavelength conversion element. (1).
- FIG. 5 is a functional block diagram showing the configuration of a pulse length expansion unit using a wavelength conversion element.
- FIG. 6 is a time chart showing how an OTDM multiplexed optical signal is split by an optical splitter.
- FIG. 7 is a functional block diagram of the configuration of the light splitting device according to the second embodiment.
- FIG. 8 is a functional block diagram of the configuration of the light splitting device according to the third embodiment.
- FIG. 9 is a functional block diagram showing a configuration of an optical multiplexing device that performs byte interleave multiplexing.
- FIG. 10 is a time chart for the optical signal of the optical multiplexing apparatus shown in FIG.
- FIG. 11 is a functional block diagram showing a configuration of an optical signal device that multiplexes overhead data with low-speed signals.
- FIG. 12 is a time chart for the optical signal of the optical multiplexing apparatus shown in FIG. 11.
- FIG. 13 is a functional block diagram (1) illustrating the configuration of the light splitting device according to the fourth embodiment.
- FIG. 14 is a functional block diagram (2) illustrating the configuration of the light splitting device according to the fourth embodiment.
- FIG. 15 is a time chart for supplementarily explaining the processing of the byte processing unit.
- FIG. 16 is a time chart relating to an optical signal received by the optical splitter shown in FIG.
- FIG. 17 is an explanatory diagram (1) for explaining a conventional OTDM (Optical Time Division Multiplex) system.
- OTDM Optical Time Division Multiplex
- FIG. 18 is an explanatory diagram (2) for explaining a conventional OTDM (Optical Time Division Multiplex) system.
- OTDM Optical Time Division Multiplex
- FIGS. 17 and 18 are explanatory diagrams for explaining a conventional OTDM (Optical Time Division Multiplex) system.
- FIG. 17 shows an example in which optical signals transmitted from the transmitting stations 10 to 40 are multiplexed (time division multiplexing) by 60 optical multiplexing devices.
- the transmitting stations 10 to 40 and the optical multiplexer 60 are connected by a waveguide (waveguide) 50 for transmitting light.
- a typical example of the waveguide 50 is an optical fiber.
- the optical multiplexing device 60 includes force bras 61 to 64, a multiplexing unit 65, and an optical phase adjustment control unit 66.
- the force bras 61 to 64 are devices that branch an optical input signal into two or more outputs.
- the power bra 61 branches the optical signal input from the transmission station 10 into two optical signals, inputs one optical signal to the multiplexing unit 65, and inputs the other optical signal to the optical phase adjustment control unit 66. input.
- the multiplexing unit 65 combines the optical signals input from the couplers 61 to 64 and the optical signal input from the FSYN.OH generation unit 66a (time division multiplexing). It is a processing part which transmits to the optical splitter 70 shown in FIG.
- the optical phase adjustment control unit 66 is a processing unit that monitors the phase of the optical signal input from the transmission stations 10 to 40 and remotely controls the phase of the optical signal transmitted from the transmission station 10 to 40.
- a connection for controlling the transmitting stations 10 to 40 from the optical phase adjustment control unit 66 (a line with a directivity arrow from the optical phase adjustment control unit 66 to the transmitting stations 10 to 40) is connected to the waveguide 50.
- this connection may be connected as an electrical signal.
- optical phase adjustment The adjustment controller 66 includes an FSYN.OH generator 66a.
- the FSYN.OH generator 66a generates data such as fixed patterns for synchronization, monitoring signal line data, order wire data (hereinafter referred to as overhead data), and inputs the generated overhead data to the multiplexer 65. Is a processing unit.
- the overhead data input to the multiplexing unit 65 is combined with other optical signals and transmitted to the optical splitter 70 shown in FIG.
- the overhead data is also used when transferring communication warnings.
- FIG. 18 shows an example in which the optical signal multiplexed by the optical multiplexer 60 is demultiplexed by the optical divider 70.
- the optical splitter 70 includes an optical amplifying unit 71, a branching unit 72, an FSY N synchronizing circuit 73, and optical gates 74 to 77.
- the optical amplifying unit 71 is a processing unit that amplifies the input optical signal, and passes the amplified optical signal to the branching unit 72.
- the branching unit 72 is a processing unit that branches an input optical signal into a plurality of parts.
- the branching unit 72 shown in FIG. 18 branches the optical signal input from the optical amplifying unit 72 into five, and inputs the branched optical signals to the FSYN synchronizing circuit 73 and the optical gates 74 to 77, respectively.
- the FSYN synchronization circuit 73 is a device that extracts the overhead data included in the optical signal acquired from the branching unit 72 and switches the optical gates 74 in accordance with the fixed synchronization pattern included in the overhead data.
- the optical gates 74 to 77 are controlled to be switched by the FSYN synchronization circuit 73, so that each optical signal multiplexed by the optical multiplexing device 60 shown in FIG.
- FIG. 1 is an explanatory diagram for explaining an OTDM network configuration that cannot be realized by a conventional optical multiplexing apparatus and optical division apparatus.
- the optical signal multiplexed by the optical multiplexer 60a is input to the optical splitter 70a, and the optical signal multiplexed by the optical multiplexer 60b is input to the optical splitter 70b. Entered. Then, the optical splitter 70a demultiplexes the input optical signal, and inputs the separated optical signals to the optical multiplexers 60c and 60d. The optical splitter 70b demultiplexes the input optical signal. The separated optical signals are input to the optical multiplexers 60c and 60d.
- the optical multiplexing devices 60c and 60d cannot OTDM multiplex each optical signal acquired from the optical splitting devices 70a and 70b (or other devices) again as light.
- an optical splitter will be described as an example of an optical signal separator.
- FIG. 2 is a functional block diagram of the configuration of the light splitting device according to the first embodiment.
- the optical splitter 100 includes an optical amplifier 101, a branching unit 102, an FSYN synchronization circuit 103, optical gates 104 to 107, and a pulse length expanding unit 108.
- the optical amplifier 101, the branching unit 102, the FSYN synchronization circuit 103, and the optical gates 104 to 107 are respectively the optical amplification unit 71, the branching unit 72, the FSYN synchronization circuit 73, and the optical gates 74 to 77 shown in FIG. The description is omitted because it is similar.
- Knoll length enlarging section 108 ⁇ L 11 is a processing section for enlarging the pulse width of the optical signal input from the optical gates 104-107 as light. Note that since the pulse length expansion unit 108 to L 11 has the same configuration, the pulse length expansion unit 108 will be described as an example here, and the description of the pulse length expansion unit 109 to 111 will be omitted.
- FIG. 3 is a functional block diagram showing the configuration of the pulse length expansion unit.
- the pulse length enlargement unit 108 includes an LN waveguide 120, a voltage application unit 121, a dispersion fiber 122, an optical amplification unit 123, and an SBS generation fiber 124.
- the LN waveguide 120 is a waveguide having the characteristics of LN (lithium niobate LiNbO>).
- the refractive index of the LN waveguide 120 changes, and the optical signal passing through the LN waveguide 120 is chirped. Is generated.
- a chirp is a phenomenon in which the optical frequency fluctuates in time within the pulse of an optical signal.
- the dispersion fiber 122 is a fiber that expands the pulse width of the optical signal generated by the chirp. is there. That is, the optical signal chirped by the LN waveguide 120 passes through the dispersion fiber 122, so that the pulse width of the optical signal is expanded.
- the optical amplification unit 123 is a processing unit that amplifies the optical signal that has passed through the dispersion fiber 122.
- the SBS generation fiber 124 is a fiber that generates SBS (stimulated Brillouin scattering) or the like and flattens the optical signal input from the optical amplification unit 123.
- SBS saturated Brillouin scattering
- the pulse width of the optical signal input from the optical gate 104 is expanded by passing through the LN waveguide 120, the dispersion fiber 122, the optical amplification unit 123, and the SBS generation fiber 124.
- each light can be kept as it is. It is easy to adjust the timing of the signal, and the network configuration shown in Fig. 1 allows the optical signal input from each optical multiplexer to be divided into the optical splitter 100 (the optical splitter instead of the optical splitters 70a and 70b). It is possible to OTDM multiplex again using an optical multiplexer.
- a nose length increasing portion having the configuration shown in FIG. 3 is most practical.
- a chirp can be generated by using a wavelength conversion element.
- It is. 4 and 5 are functional block diagrams showing the configuration of the pulse length enlargement unit using the wavelength conversion element.
- the 4 includes a wavelength conversion element 130, a periodic wavelength change light source 131, a dispersion fiber 132, an optical amplification unit 133, and an SBS generation fiber 134.
- the dispersion fiber 132, the optical amplification unit 133, and the SBS generation fiber 134 are the same as the dispersion fiber 122, the optical amplification unit 123, and the SBS generation fiber 124 described in FIG.
- the wavelength conversion element 130 is an element that positively utilizes gain fluctuations that cause pattern effects and converts the wavelength of an input optical signal.
- the wavelength of the optical signal input from the optical gate by inputting the optical signal from the optical gate and the light from the periodic wavelength changing light source 130 (light whose wavelength changes periodically) to the wavelength conversion element 130. Is converted periodically to generate a chirp.
- the optical signal generated by the chirp by the wavelength conversion element 130 is the dispersion fiber 13 2.
- the pulse width is expanded by passing through the optical amplifier 133 and the SBS generation fiber.
- wavelength conversion elements 140 and 143 include wavelength conversion elements 140 and 143, periodic wavelength change light sources 141 and 144, and a dispersion fiber 142.
- the wavelength conversion elements 140 and 143, the periodic wavelength change light sources 141 and 144, and the dispersion fiber 142 are the same as the wavelength conversion element 130, the periodic wavelength change light source 131, and the dispersion fiber 132 shown in FIG.
- the pulse width expanding unit shown in FIG. 5 can expand the pulse width of the optical signal input from the optical gate by repeating the wavelength conversion twice using the wavelength conversion elements 140 and 143. .
- FIG. 6 is a time chart showing how an OTDM-multiplexed optical signal is split by the optical splitter.
- an OTDM multiplexed optical signal is divided by optical gates 104 to 107 (optical gates 104 to 107 correspond to CH1 to CH4, respectively), and each of the divided optical signals is a pulse length expansion unit. It is enlarged by 108-111.
- the optical amplification unit 101 amplifies the optical signal multiplexed by the optical multiplexing device, and the amplified optical signal is output.
- the optical signal branched by the branching unit 102 is input to the optical gates 104 to 107 and the FSYN synchronization circuit 103.
- the FSYN synchronization circuit 103 switches the optical gates 104 to 107 on the basis of the synchronization fixed pattern included in the optical signal, demultiplexes the multiplexed optical signal, and the pulse length expansion unit 108 to: Since L 11 expands the pulse width of each optical signal that has been demultiplexed, it becomes easy to adjust the timing of each optical signal as it is, and each optical signal that is split by the optical splitter 100 again. OTDM multiplexing is possible.
- the pulse width of each optical signal is expanded using the pulse length expansion units 108 to 111. Collectively expand the pulse width of each optical signal.
- the pulse width of each optical signal is expanded at a time, so that it is possible to save the parts required for the optical splitter and the second embodiment.
- FIG. 7 is a functional block diagram of the configuration of the optical splitter according to the second embodiment.
- this optical splitter 200 includes an optical amplifying unit 201, a branching unit 202, an FSYN synchronizing circuit 203, optical gates 204 to 207, wavelength converting units 208 to 210, a wavelength multiplexing unit 211, and a pulse length expansion. Part 212 and wavelength separation part 213.
- the optical amplifying unit 202, the branching unit 202, the FSYN synchronizing circuit 203, and the optical gates 204 to 207 are the optical amplifying unit 101, the branching unit 102, and the FSYN synchronizing circuit shown in the optical splitter 100 of FIG. 103 and the optical gates 104 to 107 are the same as those in FIG. Note that the optical signal output from the optical gate 207 shown in FIG. 6 is transmitted to another device (not shown), and the optical signal from the other device is input to the wavelength multiplexing unit 211.
- the wavelength conversion units 208 to 210 are processing units that generate a chirp in the optical signal.
- the wavelength converters 208 to 210 include, for example, the LN waveguide 120 and the voltage applying unit 121 shown in FIG. That is, the LN waveguide 120 is periodically applied with a voltage by the voltage application unit 121 to change the refractive index of the LN waveguide 120 and generate a chirp in the optical signal passing through the LN waveguide 120.
- the wavelength multiplexing unit 211 is a processing unit that multiplexes the optical signals (optical signals in which chirps are generated) input from the wavelength conversion units 208 to 210.
- the wavelength multiplexing unit 211 passes the multiplexed optical signal to the pulse length expanding unit 212.
- the pulse length expanding unit 212 is a processing unit that expands the pulse width of the optical signal input from the wavelength multiplexing unit 211.
- the configuration of the pulse length expansion unit 212 includes, for example, the dispersion fiber 122, the optical amplification unit 123, and the SBS generation fiber 124 shown in FIG. That is, the dispersion fiber 122 expands the pulse width of the optical signal generated by the chirp, and the optical amplifying unit 123 amplifies the optical signal.
- the SBS generation fiber 124 shapes the waveform of the optical signal with an expanded pulse width.
- This Knoll length enlarging unit 212 can expand each pulse width of the optical signal while maintaining the multiplexed optical signal.
- the wavelength demultiplexing unit 213 is a multiplexed optical signal input by the pulse length expanding unit 212.
- optical signals separated by the wavelength demultiplexing unit 213 are transmitted by the optical multiplexers 6 Oc and 60d shown in FIG. 1 and are again OTDM multiplexed as they are.
- the optical amplifier 201 amplifies the optical signal multiplexed by the optical multiplexer, and the amplified optical signal is
- the optical signal branched by the branching unit 202 is input to the optical gates 204 to 207 and the FSYN synchronization circuit 203, and the optical signals from the optical gates 204 to 206 are input to the wavelength conversion units 208 to 210 for wavelength conversion.
- the units 208 to 210 generate a chirp in the optical signal.
- the wavelength multiplexing unit 211 multiplexes each optical signal
- the pulse length expansion unit 211 collectively expands the pulse width of the multiplexed optical signal
- the wavelength separation unit 213 performs the multiplexed optical signal. Therefore, the timing of each optical signal can be easily adjusted at low cost, and OTDM multiplexing can be performed on the split optical signal as it is.
- the optical splitter increases the pulse width of an OTDM multiplexed optical signal, converts the optical signal into an electrical signal, and demultiplexes the converted electrical signal power OTDM multiplexed optical signal. Extract signal synchronization.
- the optical signal is converted into an electrical signal by expanding the pulse width, so even with current devices (electrical circuits) that have a slow response speed, signal synchronization for demultiplexing OTDM signals with high accuracy is possible. It can be extracted.
- FIG. 9 is a functional block diagram illustrating a configuration of a light splitting device according to a third embodiment.
- the optical splitter 300 includes an optical amplifier 301, a branching unit 302, optical gates 303 to 307, a node length expanding unit 308 to 312, an optical Z electrical conversion unit 313, an FSYN synchronizing circuit 314, a phase. It has a traction part 31 5.
- the optical amplifying unit 301, the branching unit 302, and the node length expanding unit 308 to 312 are the same as the optical amplifying unit 101, the branching unit 102, and the pulse length expanding unit 108 to 111 shown in FIG. Therefore, the explanation is omitted.
- the optical gates 303 to 306 are switched on and off in accordance with an instruction from the delay control unit 316, the optical signal power input from the branch unit 302 is also cut out a predetermined optical signal, and the extracted optical signal is converted into a pulse length expansion unit 308. It is a device that inputs to 309.
- the optical gate 303 switches on and off according to the instruction from the phase deduction unit 315, cuts out a predetermined optical signal from the optical signal input from the branch unit 302, and converts the cut out optical signal to the pulse length expansion unit 308. It is a device to input to.
- the optical Z electrical conversion unit 313 is a processing unit that converts the optical signal whose pulse width is expanded by the pulse length expansion unit 312 into an electrical signal.
- the optical Z electrical converter 313 inputs the converted electrical signal to the FS YN synchronization circuit 314.
- the FSYM synchronization circuit 314 extracts the signal synchronization of the overhead data included in the electrical signal acquired from the optical Z electrical conversion unit 313, and outputs the extracted signal synchronization information to the phase deduction unit.
- 315 is a processing unit to be transferred.
- the phase deduction unit 315 adjusts the timing of the low-speed clock so that the signal synchronization acquired from the FSYN synchronization circuit 314 matches the timing of the low-speed clock (network clock) input from the outside. Then, the phase deduction unit 315 inputs a clock having a signal synchronization equivalent to that of the OTDM multiplexed optical signal to the delay control unit 316.
- the delay control unit 316 uses each optical gate based on the clock input from the phase drawing unit 315.
- Each of the demultiplexed optical signals is supplied to a pulse length expansion unit 308-3.
- the light splitting device 300 includes the pulse length expanding unit 312.
- the pulse width of the optical signal is expanded, and the optical Z electrical converter converts the optical signal into an electrical signal.
- the SYN synchronization circuit 314 extracts the signal synchronization of the overhead data as well as the electrical signal power. Then, the phase drawing unit 315 adjusts the low-speed clock based on the signal synchronization, and the delay control unit 316 switches the optical gates 303 to 306 based on the clock adjusted by the phase drawing unit 315. Even when an electric circuit with a slow reaction speed is used, an optical signal multiplexed with OTDM can be demultiplexed.
- the optical division device according to the fourth embodiment receives an optical signal that is byte-interleaved multiplexed by the optical multiplexing device, the optical division device demultiplexes the optical signal as it is.
- an optical multiplexing apparatus that performs byte interleave multiplexing will be described, and then the optical division apparatus according to the fourth embodiment will be described.
- FIG. 9 is a functional block diagram showing a configuration of an optical multiplexing apparatus that performs byte interleave multiplexing.
- this optical multiplexing apparatus 600 includes variable delay units 601 to 604, couplers 605 to 608, noise processing units 609 to 613, optical gates 614 to 618, multiplexing unit 619, and phase control unit. 620.
- the couplers 605 to 608 are the same as the couplers 61 to 64 shown in FIG.
- Optical variable delay units 601 to 604 are processing units that delay optical signals transmitted from transmitting stations 10 to 40 in accordance with control signals from phase control unit 620.
- the byte processing units 609 to 613 are processing units that perform byte interleave multiplexing on the optical signals input from the force bras 605 to 608. Since the byte processing units 609 to 613 are the same, the byte processing unit will be described here using the byte processing unit 609.
- the noise processing unit 609 includes a branch CPL 621, waveguides 622 to 629, optical gates 630 to 637, and multiplexing CPL 638.
- the branch CPL 621 is a device that branches the optical signal input from the coupler 605 and inputs the branched optical signals to the waveguides 622 to 629.
- Each of the waveguides 622 to 629 is a waveguide for transmitting an optical signal to the optical gates 630 to 637. Since the waveguides 622 to 629 have different lengths, a delay difference occurs in each optical signal passing through the waveguide. In the example shown in FIG. 9, since the waveguides become longer in the order of the waveguides 622, 623, and 629, the optical signal that passes through the waveguide 622 is the first to the optical gate 630. The optical signal that arrives early and passes through the waveguide 629 arrives at the optical gate 637 the latest.
- the optical gates 630 to 637 are devices that turn on and off in accordance with control signals from a control unit (not shown) and cut out optical signals from the respective waveguides 622 to 629 at a predetermined timing.
- the optical signals output from the optical gates 630 to 637 are input to the multiplexing CPL 638.
- the multiplexing CPL 638 is a device that multiplexes the optical signals output from the optical gates 630 to 637 and inputs the combined optical signal to the optical gate 614.
- the optical gates 614 to 618 are devices that turn on and off according to the control signal from the phase control unit 620 and cut out the optical signals from the byte processing units 609 to 613 at a predetermined timing.
- the multiplexing unit 619 is a device that multiplexes the optical signals input from the optical gates 614 to 618 and outputs the combined optical signal to the optical splitter (according to the fourth embodiment).
- the phase control unit 620 performs switching control for the optical gates 614 to 618 and controls the optical variable delay units 601 to 604 to delay the optical signals output from the optical variable delay units 601 to 604. Is a processing unit for adjusting The phase control unit 620 includes an FSYN′OH generation unit 620a.
- the FSYN'OH generation unit 620a is a processing unit that generates overhead data and inputs the generated overhead data to the byte processing unit 613.
- FIG. 10 is a time chart for working on the optical signal of the optical multiplexing device shown in FIG.
- the optical signals output from the optical variable delay units 601 to 604 are subjected to byte interleave multiplexing by the byte processing units 609 to 613, respectively. Further, the byte data is subjected to byte interleave multiplexing by the byte processing unit 613 for the overhead data generated by the FSYN'OH generating unit 620a. Then, the optical signals multiplexed by the byte processing units 609 to 613 are input to the multiplexing unit 619 and multiplexed.
- the optical multiplexing apparatus 600 shown in FIG. 9 multiplexes the overhead data generated by the FSYN'OH generation unit 620a by the byte processing unit 413, but is shown in FIG.
- overhead data may be directly input to the optical gate 618, and the overhead data may be multiplexed with a low-speed signal. In this way, by multiplexing the overhead data with the low-speed signal, timing extraction by the optical splitter on the receiving side is facilitated.
- FIG. 11 is a functional block diagram showing a configuration of an optical signal device that multiplexes overhead data with low-speed signals.
- the configuration of each part is the same as that of the optical multiplexing device 400 shown in FIG. Therefore, the description is omitted.
- the overhead data output from the FSYN'OH generator 620a is input to the optical gate 618 that is not input to the byte processor.
- FIG. 12 is a time chart for the optical signal of the optical multiplexing device shown in FIG. As shown in the figure, the overhead data is a low-speed signal and is multiplexed by the multiplexing unit 619.
- FIG. 13 and FIG. 14 are functional block diagrams illustrating the configuration of the light splitting device according to the fourth embodiment.
- 13 is an optical splitter corresponding to the optical multiplexer shown in FIG. 9
- FIG. 14 is an optical splitter corresponding to the optical multiplexer shown in FIG.
- the configuration of the light splitting device will be described in the order of FIG. 13 and FIG.
- the optical splitting device 400 includes an optical amplifying unit 401, a branching unit 402, optical gates 403 to 407, nouns ⁇ 408 to 412, nores; 3 ⁇ 43 ⁇ 4S ⁇ 413 to 417,
- optical amplification unit 401 branching unit 402, optical gates 403 to 407, pulse length expansion units 413 to 417, optical Z electrical conversion unit 418, FSYN synchronization circuit 419, phase drawing unit 420, delay control unit 4 22 ⁇ , Fig. 8
- the byte receiving units 408 to 412 are processing units that receive optical signals from the optical gates 403 to 406, cut out the received optical signals at predetermined intervals, and perform multiplexing. Since the byte receiving units 408 to 412 are the same, the byte receiving unit will be described here using the byte receiving unit 408.
- FIG. 15 is a time chart for supplementarily explaining the processing of the byte processing unit.
- the optical signals of Dl-l to Dl-8 are cut out by the optical gate 403, and the cut-out optical signals are input to the byte receiving unit 408.
- the byte receiving unit 408 branches the optical signals 01-1 to 01-8. Branch along 1 ⁇ 424 and input to waveguides 425-432.
- Each of the waveguides 425 to 432 is a waveguide for transmitting an optical signal to the optical gates 433 to 440. Since the waveguides 425 to 432 have different lengths, a delay difference occurs in each optical signal passing through the waveguide. In the example shown in FIG. 13, since the waveguides become longer in the order of the waveguides 425, 426, ... 432, the optical signal passing through the waveguide 425 reaches the optical gate 433 first, and the waveguide The optical signal passing through 432 reaches the optical gate 440 the latest.
- the optical gates 433 to 440 are devices that turn on and off in accordance with a control signal from the delay control unit 421 and cut out the optical signals from the respective waveguides 425 to 432 at a predetermined timing.
- the optical signals output from the optical gates 433 to 440 are input to the multiplexing CPL 450.
- the multiplexing CPL 450 is a device that multiplexes the optical signals output from the optical gates 433 to 440 and inputs them to the combined pulse length expansion unit 413.
- the optical signal shown in the middle part of FIG. 15 is obtained. Then, when the optical signal from the byte receiving unit 408 is input to the pulse length expanding unit 413, the pulse width of the optical signal is expanded, and the optical signal shown in the lower part of FIG. 15 is obtained.
- the delay control unit 421 is a processing unit that switches the optical gates included in the byte receiving units 408 to 412 so that the signal is synchronized with the clock input from the phase deduction unit 420.
- the frequency divider 423 is a processing unit that adjusts the clock frequency input from the phase deduction unit 420 to a specific frequency.
- the byte receiving units 408 to 412 extract the optical signals multiplexed by byte interleaving, and the pulse width of each extracted optical signal is changed to the pulse length expanding unit. Since 413 to 416 expand, it is possible to demultiplex the optical signal that has been subjected to Neute interleave multiplexing without changing the light.
- optical splitter 400 that divides an optical signal in which overhead data is multiplexed with a low-speed signal. Since the configuration of each part is the same as that of the optical splitter 400 shown in FIG. However, the light splitting device 400 shown in FIG. 14 is different from the light splitting device of FIG. 13 in that it does not have the byte receiving unit 412 and the pulse length expanding unit 417.
- FIG. 16 is a time chart for the optical signal received by the optical splitter shown in FIG. As shown in the figure, the overhead data power included in the optical signal Therefore, even when the optical Z electrical converter 418, which has a slow response speed, is used, it is possible to extract the synchronization signal of the multiplexed optical signal with high accuracy and keep the light as it is.
- the multiplexed optical signal can be demultiplexed.
- the optical signal separation device is useful for an optical network that performs communication using an optical signal, and is particularly suitable for processing an optical signal applied to an optical network as it is. .
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Application Number | Priority Date | Filing Date | Title |
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JP2007537488A JP4968073B2 (ja) | 2005-09-27 | 2005-09-27 | 光信号分離装置および光信号分離方法 |
GB0805130A GB2457738B (en) | 2005-09-27 | 2005-09-27 | Optical signal separation device and optical signal separation method |
PCT/JP2005/017780 WO2007036988A1 (ja) | 2005-09-27 | 2005-09-27 | 光信号分離装置および光信号分離方法 |
US12/213,838 US20080285976A1 (en) | 2005-09-27 | 2008-06-25 | Optical signal demultiplexing device and optical signal demultiplexing method |
US13/298,911 US8538268B2 (en) | 2005-09-27 | 2011-11-17 | Optical signal demultiplexing device and optical signal demultiplexing method |
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US12/213,838 Continuation US20080285976A1 (en) | 2005-09-27 | 2008-06-25 | Optical signal demultiplexing device and optical signal demultiplexing method |
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PCT/JP2005/017780 WO2007036988A1 (ja) | 2005-09-27 | 2005-09-27 | 光信号分離装置および光信号分離方法 |
Country Status (4)
Country | Link |
---|---|
US (2) | US20080285976A1 (ja) |
JP (1) | JP4968073B2 (ja) |
GB (1) | GB2457738B (ja) |
WO (1) | WO2007036988A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009081604A (ja) * | 2007-09-26 | 2009-04-16 | Oki Electric Ind Co Ltd | 光符号分割多重送受信装置及び光符号分割多重送受信方法 |
JP2009206923A (ja) * | 2008-02-28 | 2009-09-10 | Fujitsu Ltd | 復調回路 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4941349B2 (ja) * | 2008-02-19 | 2012-05-30 | 富士通株式会社 | Ponシステムに用いる光伝送装置 |
CN111614401B (zh) * | 2020-05-20 | 2021-08-24 | 中车株洲电力机车研究所有限公司 | 一种功率单元通讯扩展装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07131441A (ja) * | 1993-11-04 | 1995-05-19 | Nippon Telegr & Teleph Corp <Ntt> | 光多重分離装置 |
JPH08304865A (ja) * | 1995-05-11 | 1996-11-22 | Nippon Telegr & Teleph Corp <Ntt> | 波長変換装置 |
JPH11239116A (ja) * | 1998-02-20 | 1999-08-31 | Nippon Telegr & Teleph Corp <Ntt> | 光信号処理装置 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1272079B (it) * | 1993-12-16 | 1997-06-11 | Cselt Centro Studi Lab Telecom | Procedimento e dispositivo per la sincronizzazione fine di celle atm in nodi atm ottici |
JPH09181380A (ja) | 1995-12-25 | 1997-07-11 | Tera Tec:Kk | 光三角波発生器 |
US20010017720A1 (en) * | 1998-05-08 | 2001-08-30 | Hait John N. | Combination photonic time and wavelength division demultiplexing method |
JP2001356308A (ja) * | 2000-06-14 | 2001-12-26 | Oki Electric Ind Co Ltd | 光パルス周期変調装置及び光パルス信号生成装置 |
JP4030441B2 (ja) * | 2003-02-26 | 2008-01-09 | 富士通株式会社 | 光クロスコネクト装置 |
-
2005
- 2005-09-27 JP JP2007537488A patent/JP4968073B2/ja not_active Expired - Fee Related
- 2005-09-27 WO PCT/JP2005/017780 patent/WO2007036988A1/ja active Application Filing
- 2005-09-27 GB GB0805130A patent/GB2457738B/en not_active Expired - Fee Related
-
2008
- 2008-06-25 US US12/213,838 patent/US20080285976A1/en not_active Abandoned
-
2011
- 2011-11-17 US US13/298,911 patent/US8538268B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07131441A (ja) * | 1993-11-04 | 1995-05-19 | Nippon Telegr & Teleph Corp <Ntt> | 光多重分離装置 |
JPH08304865A (ja) * | 1995-05-11 | 1996-11-22 | Nippon Telegr & Teleph Corp <Ntt> | 波長変換装置 |
JPH11239116A (ja) * | 1998-02-20 | 1999-08-31 | Nippon Telegr & Teleph Corp <Ntt> | 光信号処理装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009081604A (ja) * | 2007-09-26 | 2009-04-16 | Oki Electric Ind Co Ltd | 光符号分割多重送受信装置及び光符号分割多重送受信方法 |
JP2009206923A (ja) * | 2008-02-28 | 2009-09-10 | Fujitsu Ltd | 復調回路 |
Also Published As
Publication number | Publication date |
---|---|
US8538268B2 (en) | 2013-09-17 |
US20120063784A1 (en) | 2012-03-15 |
JPWO2007036988A1 (ja) | 2009-04-02 |
US20080285976A1 (en) | 2008-11-20 |
GB2457738B (en) | 2010-08-04 |
JP4968073B2 (ja) | 2012-07-04 |
GB2457738A (en) | 2009-08-26 |
GB0805130D0 (en) | 2008-04-30 |
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