WO2007036989A1 - 光信号多重化装置および光信号多重化方法 - Google Patents
光信号多重化装置および光信号多重化方法 Download PDFInfo
- Publication number
- WO2007036989A1 WO2007036989A1 PCT/JP2005/017781 JP2005017781W WO2007036989A1 WO 2007036989 A1 WO2007036989 A1 WO 2007036989A1 JP 2005017781 W JP2005017781 W JP 2005017781W WO 2007036989 A1 WO2007036989 A1 WO 2007036989A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical signal
- optical
- multiplexing
- wavelength
- unit
- Prior art date
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 378
- 238000000034 method Methods 0.000 title claims description 12
- 239000006185 dispersion Substances 0.000 claims description 34
- 239000000835 fiber Substances 0.000 claims description 17
- 230000006866 deterioration Effects 0.000 claims description 10
- 230000015556 catabolic process Effects 0.000 claims description 7
- 238000006731 degradation reaction Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 8
- 238000012545 processing Methods 0.000 description 36
- 238000010586 diagram Methods 0.000 description 33
- 238000001514 detection method Methods 0.000 description 15
- 238000000605 extraction Methods 0.000 description 12
- 238000012937 correction Methods 0.000 description 9
- 229920000729 poly(L-lysine) polymer Polymers 0.000 description 8
- 238000004891 communication Methods 0.000 description 5
- 239000013307 optical fiber Substances 0.000 description 4
- 230000001934 delay Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
-
- 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
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
- H04B10/25133—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion including a lumped electrical or optical dispersion compensator
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/08—Time-division multiplex systems
Definitions
- the present invention relates to an optical signal multiplexing apparatus that multiplexes optical signals by an optical time division multiplexing method.
- OT DM Optical Time Division Multiplex
- This optical multiplexing device that performs OTDM multiplexing, when multiplexing optical signals, remotely controls the transmitting station that outputs the optical signal to adjust the phase of the optical signal, and the phase of each optical signal is adjusted in advance.
- OTDM multiplexing using optical signals when multiplexing optical signals, remotely controls the transmitting station that outputs the optical signal to adjust the phase of the optical signal, and the phase of each optical signal is adjusted in advance.
- 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 even when an optical signal whose phase is not adjusted in advance is acquired, the optical signal can be multiplexed as it is.
- An object of the present invention is to provide a signal multiplexing device.
- the present invention provides an optical signal multiplexing apparatus that multiplexes an optical signal by an optical time division multiplexing method, and an optical signal to be multiplexed
- the optical signal is acquired, the wavelength of the acquired optical signal is converted, and the optical signal whose wavelength is converted is passed through a waveguide that generates a propagation delay corresponding to the wavelength in the optical signal, thereby adjusting the delay amount of the optical signal.
- the optical signal multiplexing device converts the wavelength of the acquired optical signal and generates a propagation delay corresponding to the wavelength in the optical signal when the optical signal to be multiplexed is acquired.
- the optical signal whose wavelength has been converted is passed through the waveguide, the delay amount of the optical signal is adjusted, and the degradation of the waveform applied to the optical signal is compensated.
- OTDM can be multiplexed and has the effect.
- FIG. 1 is a functional block diagram of the configuration of the optical multiplexing apparatus according to the first embodiment.
- FIG. 2 is a functional block diagram showing a configuration of an optical variable delay unit.
- FIG. 3 is an explanatory diagram for explaining the difference between a dispersion fiber (DCF) and an FGB dispersion compensator (VIPA dispersion compensator).
- DCF dispersion fiber
- VIPA dispersion compensator FGB dispersion compensator
- FIG. 4 is an explanatory diagram for explaining an FGB dispersion compensator.
- FIG. 5 is a functional block diagram showing a configuration of a division compensation unit.
- FIG. 6 is a functional block diagram showing a configuration of the phase control unit shown in FIG. 1.
- FIG. 7 shows how an optical multiplexing apparatus multiplexes optical signals transmitted from each transmitting station. It is a time chart which shows.
- FIG. 8 is a diagram of an example of a system when connected to a WDM multiplexer that performs optical multiplexing apparatus power WDM multiplexing according to the second embodiment.
- FIG. 9 is a functional block diagram of the configuration of the optical multiplexing apparatus according to the second embodiment.
- FIG. 10 is a functional block diagram showing a configuration of a wavelength adjustment unit.
- FIG. 11 is a diagram showing a modified example that works on the configuration of the wavelength adjusting unit.
- FIG. 12 is a functional block diagram of the configuration of the optical multiplexing apparatus according to the third embodiment.
- FIG. 13 is a functional block diagram showing the configuration of the phase control unit shown in FIG.
- FIG. 14 is a functional block diagram of the configuration of the optical multiplexing apparatus according to the fourth embodiment.
- FIG. 15 is a time chart for the optical signal of the optical multiplexing device shown in FIG.
- FIG. 16 is a functional block diagram showing a configuration of an optical multiplexing apparatus that multiplexes overhead data with a low-speed signal.
- FIG. 17 is a time chart for the optical signal of the optical multiplexer shown in FIG.
- FIG. 18 is a diagram (1) illustrating a modified example that works on the configuration of the byte processing unit.
- FIG. 19 is a diagram (2) showing a modified example that works on the configuration of the byte processing unit.
- FIG. 20 is an explanatory diagram for explaining a conventional OTDM.
- FIG. 20 is an explanatory diagram for explaining a conventional OTD M (Optical Time Division Multiplex).
- an optical multiplexing device 60 that multiplexes optical signals transmitted from the transmitting stations 10 to 40 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 (time division multiplexing) each optical signal input from the couplers 61 to 64 and the optical signal input from the FSYN.OH generation unit 66a, and the combined optical signal is an optical splitter. It is a processing part that transmits to Here, the optical splitter receives the optical signal combined by the multiplexer 65.
- the device demultiplexes the received optical signal.
- 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 stations 10 to 40. .
- the optical phase adjustment control unit 66 includes an FSYN'OH generation unit 66a.
- the FSYN'OH generator 66a generates data (hereinafter referred to as overhead data) such as a fixed pattern for synchronization, monitoring signal line data, and order wire data, and transmits the generated overhead data to the optical splitter. It is a processing unit. Overhead data is also used when transferring communication warnings.
- the optical multiplexing device 60 shown in FIG. 20 needs to remotely control the phase of the optical signal transmitted from each of the transmission stations 10 to 40 and OTDM multiplex each optical signal, There is a problem in that the phase control is performed in advance! And the multiplexing for the optical signal cannot be executed.
- the optical multiplexing apparatus is an optical signal transmitted from each transmission station 10 to 40 without remotely controlling the phase of the optical signal transmitted from each transmission station 10 to 40 ( This optical signal has a different timing), adjusts the timing of each received optical signal as it is, and executes OTDM multiplexing.
- FIG. 1 is a functional block diagram of the configuration of the optical multiplexing apparatus according to the first embodiment.
- the optical multiplexing apparatus 100 according to the first embodiment includes optical variable delay units 101 to 104, force bras 105 to 108, optical gates 109 to 112, a multiplexing unit 113, a phase control unit 114, FSYN.OH generator 11 4a.
- the couplers 105 to 108 are the same as the couplers 61 to 64 shown in FIG.
- the optical variable delay units 101 to 104 are processing units that perform delay adjustment of the optical signals transmitted from the transmitting stations 10 to 40 in accordance with the control signal input from the phase control unit 114. Since the optical variable delay units 101 to 104 have the same configuration, the configuration of the optical variable delay unit will be described here using the optical variable delay unit 101 as an example.
- FIG. 2 is a functional block diagram showing a configuration of the optical variable delay unit.
- the optical variable delay unit 101 includes wavelength shift devices 115 and 117, a waveguide 116, and a dispersion compensation unit 118.
- the wavelength shift device 115 is a device that converts (shifts) the wavelength of an optical signal. When the optical signal whose wavelength is converted by the wavelength shift device 115 passes through the waveguide 116, a propagation delay corresponding to the converted wavelength is generated in the optical signal.
- the wavelength shift device 115 adjusts the shift amount of the wavelength to be converted and adjusts the propagation delay amount according to the control signal input from the phase control unit 114.
- the wavelength shift device 117 is a device that aligns the wavelength of the optical signal converted by the wavelength shift device 115 to a specific wavelength.
- the dispersion compensator 118 is a device that restores the dispersion waveform caused by the wavelength-shifted optical signal passing through the waveguide 116.
- the dispersion compensation unit 118 uses a special dispersion compensation means such as FBG (fiber grating) or VIPA (Virtually Imaged Phased Array), and dispersion compensation such as DCF (Dispersion Compensation Fiber). Fiber is not used.
- FIG. 3 is an explanatory diagram for explaining the difference between a dispersion fiber (DCF) and an FGB dispersion compensator (VIPA dispersion compensator).
- the delay adjustment may be offset.
- FIG. 3 is an explanatory diagram for explaining the FGB dispersion compensator.
- the FGB dispersion compensator uses a fiber grating filter.
- This fiber grating filter reflects only a specific wavelength by changing the refractive index of the waveguide according to a specific period. That is, by changing this period in steps, the reflection point with respect to the wavelength can be shifted, and the chromatic dispersion can be compensated.
- dispersion of ⁇ / ⁇ ⁇ (psZnm) is compensated.
- d ⁇ is the difference between ⁇ (where ⁇ is the wavelength of the reflected light 1) and ⁇ (where ⁇ is the wavelength of the reflected light 3), and dT is The time difference between reflected light 1 and reflected light 3 (dL is the distance from reflected light 1 to reflected light 3 and Vg is the velocity of the wave).
- the VIPA dispersion compensator uses a VIPA plate or a free-form mirror as a reflection means.
- FIG. 5 is a functional block diagram showing the configuration of the division compensation unit.
- the dispersion compensation unit 118 includes a wavelength separation unit 119, waveform correction units 120 to 123, and a wavelength multiplexing unit 124.
- the wavelength demultiplexing unit 119 is a processing unit that divides each signal included in the optical signal for each wavelength, and inputs each divided optical signal to the waveform correction units 120 to 123.
- the waveform correction units 120 to 123 are processing units that restore the waveform of the optical signal. Since the waveform correction units 120 to 123 have the same configuration, here, the waveform correction unit 120 will be used to describe the waveform correction unit.
- the waveform correction unit 120 includes an optical circulator 120a and a variable fiber grating filter 120b.
- the optical circulator 120a inputs the optical signal acquired from the wavelength demultiplexing unit 119 to the variable fiber grating filter 120b, and inputs the dispersion-compensated optical signal output from the variable fiber grating filter 120b to the wavelength multiplexing unit 124. It is a device to do.
- the variable fiber grating filter 120b is the same as the fiber grating filter shown in FIG.
- the optical multiplexing apparatus 100 omits the dispersion compensation unit 118 shown in Fig. 2 when only a part of the waveform is extracted and OTDM multiplexed even if the waveform of the optical signal is distorted. can do.
- the optical gates 109 to 112 are turned on and off by the control signal input from the phase control unit 114, and the optical signals input from the optical variable delay units 101 to 104 are turned on. It is a device that cuts out at a predetermined timing.
- the multiplexing unit 113 is a processing unit that multiplexes the optical signal input from the optical gates 109 to 112 and the overhead data input from the phase control unit 114, and transmits the multiplexed data to another device (for example, an optical splitter). is there.
- the phase control unit 114 is a processing unit that performs switching control on the optical gates 109 to 112 and controls the optical variable delay units 101 to 104 to adjust the delay amount of the optical signal. Note that the phase control unit 114 switches the optical variable delay unit 10 at the timing of switching the optical gates 109 to 112. The delay amount applied to the optical signals of the optical variable delay units 101 to 104 is adjusted so that the change point of the data output from 1 to 104 does not come.
- FIG. 6 is a functional block diagram showing the configuration of the phase control unit shown in FIG.
- the phase control unit 114 includes an optical selector 130, a PD 131, a noise circuit 132, a clock extraction unit 134, SEL 135a to 135d, a gate 136a to 136d, a phase discriminator 137a to 137d, and a frequency divider. Sections 138a to 138d, PLLs 139a to 139d, an optical selector, and a CLK free-running switching control section 140.
- the optical selector 130 is a device that switches an optical signal from each channel in accordance with a control signal input from the optical selector ZCLK free-running switching control unit 140.
- the optical signal forces input from the force bras 105 to 108 also correspond to the input optical signals.
- PD (Photo Diode) 131 is a device that converts an optical signal input from optical selector 130 into an electrical signal. Note that the electrical signal converted by the PD 131 is input to the preamplifier 133 after being given a constant noise voltage by the bias circuit 132.
- the preamplifier 133 is a device that amplifies the electric signal input from the PD 131.
- the preamplifier 133 inputs the amplified electrical signal to the clock extractor 134.
- the clock extraction unit 134 is a processing unit that extracts a clock of an electric signal and inputs the extracted clock to the SELs 135a to 135d.
- SELs (selectors) 135a to 135d are devices that switch an input clock according to a control signal from the optical selector ZCLK free-running switching control unit 140 and input the clock to the phase discriminators 137a to 137d. Since SEL135a to 135d are the same, SEL135a is used here to explain SEL. Similarly, gates 136a to 136d, phase discriminators 137a to 137d, frequency dividers 138a to 138d, and PLL139a to 139d, which will be described below, are also described using the gate 136a, phase discriminator 137a, frequency divider 138a, and PLL139a. To do.
- the SEL 135a switches between the clock input from the clock extraction unit 134 and the clock input from the PLL 139a according to the control signal from the optical selector ZCLK free-running switching control unit 140, and acquires the acquired clock in phase. Input to discriminator 137a.
- the SEL 135a is optically controlled by the optical selector ZCLK free-running switching control unit 140.
- the clock of the clock extractor 134 is acquired.
- the SEL 135a acquires the clock from the PLL 139a at the timing when the optical selector Z free-running switching control unit 140 is switched to a channel other than channel 1 (any power of channels 2 to 5).
- the gate 136a is a device that obtains a control signal from the optical selector ZCLK free-running switching control unit 140 and a clock from the SEL 135a, and notifies each optical gate 109 of timing for switching on / off of the optical gate 109. is there.
- the phase discriminator 137a extracts the difference between the clock input to the SEL135a and the network clock, adjusts the network clock using the difference between the clocks, and optically delays the adjusted clock signal. This is a device for inputting to the unit 101 and the frequency dividing unit 138a. Each of the optical variable delay units 101 to 104 adjusts the delay amount of the optical signal based on the clock input from the phase discriminators 137a to 137d.
- Frequency divider 138a is a device that adjusts the frequency of the clock input from phase discriminator 137a to a specific frequency and inputs the adjusted clock signal to PLL 139a.
- the PLL 139a is a device that matches the input signal input to the frequency divider 138a with the output signal output from the PLL 139a.
- the phase control unit 114 includes an FSYN′OH generation unit 114 a in addition to the configuration shown in FIG.
- the FSYN'OH generation unit 114 a is a processing unit that generates overhead data such as a fixed pattern for synchronization, monitoring signal line data, and order wire data, and inputs the generated overhead data to the multiplexing unit 113.
- FIG. 7 is a time chart showing how the optical multiplexing device multiplexes optical signals transmitted from each transmitting station.
- the optical signals obtained by the power of each channel (CH1 to CH4) at the time of input to the optical multiplexing apparatus 100 do not coincide with each other, but the optical variable delay units 101 to 104 As a result, the timing of each optical signal is aligned, and the phase control unit 114 can OTDM multiplex each optical signal as it is by switching the optical gates 109 to 112.
- the optical multiplexing apparatus 100 includes the transmitting stations 10 to 40.
- the optical variable delay units 101 to 104 receive the optical signal, and the phase control unit 114 controls the optical variable delay units 101 to 104 to adjust the delay amount of each optical signal and each optical gate 109 to 1.
- Switch 12 at a specific timing.
- the multiplexing unit 113 multiplexes the optical signals input from the optical gates 109 to 112 and the FSYN'OH generating unit 114a, and the combined optical signal is transmitted to another device such as an optical splitter. Since transmission is performed, even if the timing of the optical signal transmitted from each transmitting station 10 to 40 varies, it is possible to OTDM multiplex each optical signal as it is with accuracy.
- the optical multiplexing apparatus adjusts the wavelength of the optical signal subjected to OTDM multiplexing to a specific wavelength.
- the optical multiplexing device adjusts the wavelength of the optical signal that has been subjected to OTDM multiplexing to a specific wavelength, thereby efficiently performing WDM (Wavelength Division Multiplexing) using the optical signal that has been multiplexed with OTDM. Can be executed.
- WDM Widelength Division Multiplexing
- FIG. 8 is a diagram of an example of a system when connected to a WDM multiplexer that performs optical multiplexing apparatus power WDM multiplexing according to the second embodiment.
- the optical multiplexer shown in the figure adjusts the wavelength of the OTD M-multiplexed optical signal to a specific wavelength (the wavelength specified for the WDM multiplexer). WMD multiplexing can be performed without adjusting the wavelength of the acquired optical signal.
- FIG. 9 is a functional block diagram of the configuration of the optical multiplexing apparatus according to the second embodiment.
- this optical multiplexing apparatus 200 includes optical variable delay units 201 to 204, couplers 205 to 208, optical gates 209 to 212, multiplexing unit 213, phase control unit 214, and wavelength adjustment unit 215. .
- optical conversion delay units 201 to 204, the couplers 205 to 208, the optical gates 209 to 212, the multiplexing unit 213, and the phase control unit 214 are the optical variable delay units 101 to 104 and the coupler 105 shown in FIG. ⁇ 10 8, optical gates 109 to 112, multiplexing unit 113, and phase control unit 114 are the same as those in FIG.
- the wavelength adjustment unit 215 is a processing unit that adjusts the wavelength of the optical signal output from the multiplexing unit 213 to a specific wavelength (converts it to a wavelength for performing WDM multiplexing).
- Figure 10 shows wavelength tuning It is a functional block diagram which shows the structure of a part. As shown in the figure, the wavelength adjustment unit 215 includes SO A 216, 219, LD 217, 220, and filters 218, 221.
- SOAs semiconductor optical amplifiers
- SOAs semiconductor optical amplifiers
- XPM cross-phase modulation
- the multiplexing unit 215 and the laser light from the LD (Laser Diode) 217 By inputting the optical signal from the multiplexing unit 215 and the laser light from the LD (Laser Diode) 217 to this SOA 216 and cutting out a part of the optical signal by the filter 219, the waveform of the original optical signal is inverted. An optical signal is generated. Then, the optical signal output from the filter 218 and the laser light from the LD 220 are input to the SOA 219, the optical signal output from the SOA 219 is passed through the filter 221 and a part of the optical signal is cut out to obtain the original optical signal.
- the wavelength of the optical signal can be converted to a specific wavelength.
- the optical multiplexing apparatus 200 inputs the optical signal output from the multiplexing unit 213 to the wavelength adjustment unit 215, and sets the wavelength of the optical signal to a specific wavelength. Therefore, the WDM multiplexer connected to the optical multiplexer 200 can WDM multiplex the optical signal that is OTDM multiplexed with high efficiency.
- the configuration of the wavelength adjusting unit 215 is not limited to that shown in FIG. 10, and for example, the wavelength can be adjusted even in the configuration shown in FIG.
- FIG. 11 is a diagram illustrating a modification of the configuration of the wavelength adjustment unit.
- the wavelength adjustment unit includes a wavelength shift device 230, a waveguide 230, and a tunable dispersion compensation unit 232.
- the wavelength adjusting unit performs wavelength conversion of the optical signal output from the multiplexing unit 213 by using the wavelength shift device, and passes the wavelength-converted optical signal through the waveguide 231 to generate an optical signal. causess a propagation delay. Then, the wavelength of the optical signal can be adjusted to a specific wavelength by inputting the optical signal in which the propagation delay has occurred to the tunable dispersion correction unit 232 and adjusting the dispersion compensation amount.
- the wavelength shift device (wavelength shift device 117 in FIG. 2) included in the components of the optical variable delay units 201 to 204 is used for adjustment. You may do it.
- Example 3 The optical multiplexing device according to (1) incorporates a delay line that shifts the delay time of each channel force in a fixed manner. As described above, the optical multiplexing apparatus can OTDM multiplex each optical signal without performing complicated delay adjustment by incorporating the delay line.
- FIG. 12 is a functional block diagram of the configuration of the optical multiplexing apparatus according to the third embodiment.
- this optical multiplexer 300 includes an optical variable delay unit 301 to 304, a coupler 305 to 308, a delay line 309 to 312, an optical gate 313 to 316, a multiplexing unit 317, and a phase control unit. 318.
- the optical variable delay units 301 to 304, the couplers 305 to 308, the optical gates 313 to 316, the multiplexing unit 317 are the optical variable delay units 101 to 104, the couplers 105 to 108, and the optical shown in FIG. Since it is the same as that of the gates 109 to 112 and the multiplexing unit 113, description thereof is omitted.
- the delay lines 309 to 312 are waveguides that delay the optical signal passing through the delay lines 309 to 312 (according to the length of the delay line). By adjusting the length of the delay lines 309 to 312, the delay amount of the optical signal output from the optical variable delays 301 to 304 can be freely adjusted. In other words, the optical variable delay units 301 to 30 can match the phases of the optical signals and adjust the lengths of the delay lines 309 to 312 to execute OTDM multiplexing of the optical signals. In the example of FIG. 12, the delay lines become longer in the order of the delay lines 309, 310, 311 and 312. Therefore, the optical signals reach the optical gates in the order of the delay lines 309, 310, 311 and 312.
- the phase control unit 318 performs switching control for the optical gates 313 to 316 and controls the optical variable delay units 301 to 304 to control the phase of the optical signal output from each of the optical variable delay units 301 to 304. Is a processing unit for matching the.
- FIG. 13 is a functional block diagram showing a configuration of the phase control unit shown in FIG. As shown in the figure, this time, U ⁇ 318 ⁇ , PD319a to 319d, noise circuit 320a to 320d, preamplifier 321a to 321d, clock extractor 322a to 322d, SEL323a to 323d, logic Gates 324a to 324d, phase discriminators 325a to 325d, frequency dividers 326a to 326d, PLL327a to 327d, CLK loss detection unit 328a to 328d, error detection calculation circuit 329, FSYN.OH generation unit 330, LD331, optical gate 332 .
- the optical signals from the respective channels (CH1 to CH4) shown in the figure correspond to the optical signals input from the force bras 305 to 308.
- PD319a to 319d, noise circuit 320a to 320d, preamplifier 321a to 321d, clock 322a to 322d, phase discriminators 325a to 325d, frequency dividers 326a to 326d, PLL327a to 327d are the PD131, bias circuit 132, preamplifier 133, clock extractor 134, phase discriminator shown in FIG. 137a to 137d, frequency dividers 138a to 138d, and PLL 139a to 139d are the same as the above, and thus the description thereof is omitted.
- the CLK loss detection units 328a to 328d monitor the clocks extracted by the clock extraction units 322a to 322d, respectively, and when the clock being monitored is interrupted, the clock (clock extraction unit card) This is a processing unit that switches between a free-running clock (network clock) and a free-running clock (network clock). Since the CLK disconnection detection units 328a to 328d are the same, the CLK disconnection detection unit 328a will be described here. Similarly, SE L323a to 323d and logic gates 324a to 324d described below will be described using SEL323a and logic gate 324a.
- the CLK loss detection unit 328a monitors the clock signal extracted by the clock extraction unit 322a, that is, the clock used for the optical signal from the channel 1, and when this clock is interrupted, the SEL323a and the logic gate 324a This is a processing unit that controls the external clock to switch to the free-running clock.
- the SE L323a inputs the clock from the clock extraction unit 322a to the phase discriminator 325a and the logic gate 324a.
- the CLK loss detection unit 328a switches the SEL323a, and the SEL323a inputs the clock signal of the PLL327a to the phase discriminator 325a and the logic gate 324a.
- the logic gate 324a switches the optical gate 313 according to the external clock when the clock extracted by the clock extraction unit 322a is not interrupted. On the other hand, when the clock extracted by the clock extraction unit 322a is interrupted, the logic gate 214a switches the optical gate 313 with the free-running clock.
- the error detection arithmetic circuit 329 is an electrical signal of each channel 1 to 4 whose phases are matched (when input to the error detection arithmetic circuit 329, the optical signal of each channel 1 to 4 is an electrical signal by PD319a to 319d. This is a device that computes information for error detection.
- the error detection arithmetic circuit 329 sends the calculated error detection information to the FSY Input to N ⁇ OH generator 330.
- the FSYN'OH generating unit 330 is a processing unit that acquires information for error detection from the error detection arithmetic circuit 329 and generates overhead data based on the acquired information.
- the overhead data generated by the F SYN'OH generating unit 330 is converted into an optical signal by the LD 331 and input to the multiplexing unit 317 via the optical gate 332.
- the optical multiplexing apparatus matches the phases of the optical signals output from the optical variable delay units 301 to 304, and increases the lengths of the delay lines 309 to 312. By adjusting, delaying each optical signal, and combining by the combining unit 317, it is possible to execute OTDM multiplexing, eliminating the need to perform complex control on the optical variable delay units 301 to 304. Each optical signal can be multiplexed efficiently.
- the FSYN'OH generation unit 330 is incorporated in the phase control unit 318. 1S
- the FSYN'OH generation unit 330 may be provided at another position, which is not limited to this. .
- FIG. 14 is a functional block diagram of the configuration of the optical multiplexing apparatus according to the fourth embodiment.
- this optical multiplexer 400 includes optical variable delays 401 to 404, couplers 405 to 408, noise processing units 409 to 413, optical gates 414 to 418, a multiplexing unit 419, A phase control unit 420 is provided.
- the optical variable delay units 401 to 404, the couplers 405 to 408, the optical gates 414 to 418, the multiplexing unit 419, and the phase control unit 420 are the optical variable delay units 101 to 104 and couplers shown in FIG. Since this is the same as 105 to 108, optical gates 109 to 112, multiplexing unit 113, and phase control unit 114, description thereof is omitted.
- Byte processing units 409 to 413 are processing units that perform byte interleave multiplexing. Since the byte processing units 409 to 413 are the same, here, the byte processing unit 409 will be used to describe the Neut processing unit.
- Branch CPL430 branches the optical signal input from coupler 405, This is a device for inputting each branched optical signal to each waveguide 431-438.
- Each of the waveguides 431 to 438 is a waveguide for transmitting an optical signal to the optical gates 439 to 446. Since the waveguides 431 to 438 have different lengths, a delay difference occurs in each optical signal passing through the waveguide. In the example shown in FIG. 14, since the waveguides become longer in the order of waveguides 431, 432, ..., 446, the optical signal passing through the waveguide 431 reaches the optical gate 439 first, and the waveguide The optical signal passing through 446 reaches the optical gate 446 the latest.
- the optical gates 439 to 446 are devices that are turned on / off by a control signal from a control unit (not shown) and cut out the optical signals from the respective waveguides 431 to 438 at a predetermined timing.
- the optical signals output from the optical gates 439 to 446 are input to the multiplexing CPL 447.
- the combined CP L447 is a device that combines optical signals output from the optical gates 439 to 446 and inputs the combined optical signals to the optical gate 414.
- FIG. 15 is a time chart for the optical signal of the optical multiplexing device shown in FIG.
- the optical signals output from the optical variable delay units 401 to 404 are subjected to byte interleave multiplexing by the byte processing units 409 to 412 respectively.
- the overhead data generated by the FSYN'OH generation unit 420a is subjected to byte interleave multiplexing by the byte processing unit 413.
- the optical signals multiplexed by the byte processing units 409 to 413 are input to the multiplexing unit 419 and multiplexed.
- the byte processing units 409 to 413 use the branch CPL, the waveguides having different lengths, and the multiplexing CPL, so that the byte of the optical signal is obtained. Since interleave multiplexing is performed with light, Neutral interleave multiplexing can be performed efficiently.
- the optical signal subjected to byte interleave multiplexing by the multiplexing unit 419 can be further subjected to OTDM multiplexing as it is.
- the overhead data generated by the FSYN'OH generation unit 420 is multiplexed by the byte processing unit 413.
- 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. 16 shows the configuration of an optical multiplexing apparatus that multiplexes overhead data with a low-speed signal. It is a functional block diagram shown. The configuration of each part is the same as that of the optical multiplexing apparatus 400 shown in FIG. In FIG. 16, the overhead data output from the FSYN.OH generation unit 420a is input to the optical gate 418 that is not input to the byte processing unit.
- FIG. 17 is a time chart for the optical signal of the optical multiplexing apparatus shown in FIG. As shown in the figure, the overhead data is a low-speed signal and is multiplexed by the multiplexing unit 419.
- this byte processing unit 500 has a 1: N optical gate 501 that divides an optical signal into N (N is 2 or more), and each divided optical signal is connected to each waveguide (waveguide). (There are N paths.)
- the signals are input to 502 to 509 and subjected to delay adjustment, and each optical signal subjected to delay adjustment is multiplexed by the multiplexing CPL 510.
- this byte processing unit 600 divides an optical signal into two 1: 2 SW (Switch) 601 to 607 connected in series, and this 1: 2SW 601 to 607 is connected. It is also possible to divide the optical signal using it, adjust the delay of each optical signal, and multiplex each optical signal by the multiplexing CPL608.
- the optical signal multiplexing device is useful for an optical network that performs communication using optical signals, and in particular, efficiently multiplexes optical signals that have not been adjusted in timing, Suitable for sending to the receiving side.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2005/017781 WO2007036989A1 (ja) | 2005-09-27 | 2005-09-27 | 光信号多重化装置および光信号多重化方法 |
JP2007537489A JP4696122B2 (ja) | 2005-09-27 | 2005-09-27 | 光信号多重化装置 |
GB0805129A GB2446528B (en) | 2005-09-27 | 2005-09-27 | Optical signal multiplexing device and optical signal multiplexing method |
US12/078,059 US7623791B2 (en) | 2005-09-27 | 2008-03-26 | Optical signal multiplexing device and optical signal multiplexing method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2005/017781 WO2007036989A1 (ja) | 2005-09-27 | 2005-09-27 | 光信号多重化装置および光信号多重化方法 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/078,059 Continuation US7623791B2 (en) | 2005-09-27 | 2008-03-26 | Optical signal multiplexing device and optical signal multiplexing method |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007036989A1 true WO2007036989A1 (ja) | 2007-04-05 |
Family
ID=37899429
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/017781 WO2007036989A1 (ja) | 2005-09-27 | 2005-09-27 | 光信号多重化装置および光信号多重化方法 |
Country Status (4)
Country | Link |
---|---|
US (1) | US7623791B2 (ja) |
JP (1) | JP4696122B2 (ja) |
GB (1) | GB2446528B (ja) |
WO (1) | WO2007036989A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20220360339A1 (en) * | 2021-05-04 | 2022-11-10 | Electronics And Telecommunications Research Institute | Optical transmitter based on optical time division multiplexing |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8444272B2 (en) * | 2010-01-25 | 2013-05-21 | Corning Incorporated | Multi-projector system using multiplexed illumination |
CN110445568B (zh) * | 2016-12-23 | 2021-04-20 | 华为技术有限公司 | 一种时钟传输方法及相关设备 |
US20190089471A1 (en) * | 2017-09-21 | 2019-03-21 | Qualcomm Incorporated | System and method for mmwave massive array self-testing |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002208894A (ja) * | 2001-01-11 | 2002-07-26 | Oyokoden Lab Co Ltd | 光通信方法およびその方法を用いた光通信装置 |
JP2003309521A (ja) * | 2002-04-17 | 2003-10-31 | Fujitsu Ltd | Vipa波長分散補償器 |
JP2004356742A (ja) * | 2003-05-27 | 2004-12-16 | Hitachi Ltd | 信号波形劣化補償器 |
JP2005017385A (ja) * | 2003-06-23 | 2005-01-20 | Fujitsu Ltd | 分散補償器 |
JP2005079833A (ja) * | 2003-08-29 | 2005-03-24 | National Institute Of Information & Communication Technology | 分散補償制御方法及び装置並びに光伝送方法及びシステム |
Family Cites Families (6)
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 |
US6587261B1 (en) * | 1999-05-24 | 2003-07-01 | Corvis Corporation | Optical transmission systems including optical amplifiers and methods of use therein |
JP2001274772A (ja) * | 2000-03-24 | 2001-10-05 | Kddi Corp | Tdm光多重装置、tdm光分離装置、wdm/tdm変換装置及びtdm/wdm変換装置 |
US7206509B2 (en) * | 2002-11-29 | 2007-04-17 | Lucent Technologies Inc. | Method and apparatus for temporally shifting one or more packets using wavelength selective delays |
JP4444689B2 (ja) * | 2004-02-26 | 2010-03-31 | 富士通株式会社 | 光通信用光装置 |
-
2005
- 2005-09-27 GB GB0805129A patent/GB2446528B/en not_active Expired - Fee Related
- 2005-09-27 WO PCT/JP2005/017781 patent/WO2007036989A1/ja active Application Filing
- 2005-09-27 JP JP2007537489A patent/JP4696122B2/ja not_active Expired - Fee Related
-
2008
- 2008-03-26 US US12/078,059 patent/US7623791B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002208894A (ja) * | 2001-01-11 | 2002-07-26 | Oyokoden Lab Co Ltd | 光通信方法およびその方法を用いた光通信装置 |
JP2003309521A (ja) * | 2002-04-17 | 2003-10-31 | Fujitsu Ltd | Vipa波長分散補償器 |
JP2004356742A (ja) * | 2003-05-27 | 2004-12-16 | Hitachi Ltd | 信号波形劣化補償器 |
JP2005017385A (ja) * | 2003-06-23 | 2005-01-20 | Fujitsu Ltd | 分散補償器 |
JP2005079833A (ja) * | 2003-08-29 | 2005-03-24 | National Institute Of Information & Communication Technology | 分散補償制御方法及び装置並びに光伝送方法及びシステム |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20220360339A1 (en) * | 2021-05-04 | 2022-11-10 | Electronics And Telecommunications Research Institute | Optical transmitter based on optical time division multiplexing |
US11606149B2 (en) * | 2021-05-04 | 2023-03-14 | Electronics And Telecommunications Research Institute | Optical transmitter based on optical time division multiplexing |
Also Published As
Publication number | Publication date |
---|---|
GB0805129D0 (en) | 2008-04-30 |
GB2446528A (en) | 2008-08-13 |
US7623791B2 (en) | 2009-11-24 |
JPWO2007036989A1 (ja) | 2009-04-02 |
JP4696122B2 (ja) | 2011-06-08 |
US20080181610A1 (en) | 2008-07-31 |
GB2446528B (en) | 2010-11-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7945165B2 (en) | Optical signal synchronizer | |
US20030020985A1 (en) | Receiver for high-speed optical signals | |
US6396607B1 (en) | Multi-wavelength all-optical regenerators (MARS) | |
US8073333B2 (en) | Multiplex delay unit | |
US7853151B2 (en) | Optical communication system, method, and optical transmitting station | |
WO2007036989A1 (ja) | 光信号多重化装置および光信号多重化方法 | |
JP3789784B2 (ja) | 光直交周波数分割多重伝送方式及び伝送方法 | |
US7068936B2 (en) | Methods and apparatus for optical switching | |
JP4968073B2 (ja) | 光信号分離装置および光信号分離方法 | |
GB2362281A (en) | Converting optical time division multiplexed signals to wavelength division multiplexed signals | |
JP2005260370A (ja) | 光信号劣化補償器 | |
US8260142B2 (en) | Multi-channel optical arrayed time buffer | |
JP2019200379A (ja) | 波長変換装置、伝送装置、及び伝送システム | |
JP2018180406A (ja) | 波長変換装置、制御光生成装置、波長変換方法、および制御光生成方法 | |
EP1571765B1 (en) | Optical synchronizer | |
JP5398251B2 (ja) | 波長分散測定装置及び波長分散測定方法 | |
US6661549B1 (en) | Method of and a device for polarization-independent optical demultiplexing | |
GB2595862A (en) | Optical apparatus and associated methods | |
GB2595861A (en) | Optical apparatus and associated methods | |
GB2595863A (en) | Optical apparatus and associated methods | |
WO2021250393A1 (en) | Optical apparatus for and methods of generating optical signals to increase the amount of data in an optical network | |
JP2003051809A (ja) | 波長多重光伝送方式及び伝送方法 | |
JP2000201110A (ja) | 光伝送装置 | |
JP5079659B2 (ja) | 光アクセスシステム | |
JPH05235865A (ja) | 光ディジタル信号伝送方式 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2007537489 Country of ref document: JP |
|
ENP | Entry into the national phase |
Ref document number: 0805129 Country of ref document: GB Kind code of ref document: A Free format text: PCT FILING DATE = 20050927 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 0805129.4 Country of ref document: GB |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 05787708 Country of ref document: EP Kind code of ref document: A1 |