CN102843194A - Chromatic dispersion compensating system and method for wavelength selector switch type ROADM (Reconfigurable Optical Add Drop Multiplexer) - Google Patents
Chromatic dispersion compensating system and method for wavelength selector switch type ROADM (Reconfigurable Optical Add Drop Multiplexer) Download PDFInfo
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Abstract
The invention discloses a chromatic dispersion compensating system and method for a wavelength selector switch type ROADM (Reconfigurable Optical Add Drop Multiplexer), relating to the chromatic dispersion compensating field in optical communication. The system comprises the wavelength selector switch (WSS) type ROADM, a network management system, a chromatic dispersion monitoring sub system, an optical switch and a plurality of optical dividers, wherein each output link of a WSS module in the ROADM is respectively connected to one of the plurality of optical dividers; each optical divider divides an optical signal of a certain proportion to the optical switch; the optical switch is connected to the chromatic dispersion monitoring sub system; and the network management system is respectively connected with the optical switch, the chromatic dispersion monitoring sub system and the WSS module in the ROADM. According to the invention, the characteristics of the WSS type ROADM are used to carry out a tunable chromatic dispersion compensation while the ROADM achieves a flexible network wavelength configuration, and residual dispersion acquired after sectional fixed optical compensation can be compensated by the WSS, thereby reducing the cost and improving the transmission quality while achieving a flexible high-speed optical network.
Description
Technical field
The present invention relates to the dispersion compensation field in the optical communication, particularly relate to Dispersion Compensation Systems and the method for a kind of wavelength-selective switches type ROADM.
Background technology
In recent years along with the development year by year of multimedia communication services such as speech, data and video image; Particularly the traffic carrying capacity of data and video transmission increases rapidly; Requirement to transmission capacity, speed, distance and the transmission quality of optical-fiber network improves constantly, and the flexibility, the construction of optical-fiber network and the reduction of operation and maintenance cost that in recent years optical-fiber network are made up are particularly paid close attention to.
In order to satisfy IP (Intemet Protocol; The agreement that interconnects between the network) demand of network; The construction of basis bearer network gradually adopts and a kind ofly is the photosphere reconfiguration technique of representative with ROADM (Reconfigurable Optical Add-Drop Multiplexer, ROADM).The appearance of ROADM system makes WDM (Wavelength Division Multiplexing; Wavelength division multiplexing) equipment network carries out the transition to ring-network topology, the crossing topology of two rings and more complicated networking structure from simple pointtopoint topology, realizes the mesh network topology the most at last.ROADM with dynamic-configuration ability is the important foundation that optical-fiber network " intelligence " is realized.ROADM not only can look like traditional OA DM (Optical Add-Drop Multiplexer; Optical add/drop multiplexer) that kind; Can from the multi-wavelength link signal, extract specific wavelength to this locality; And local wavelength is inserted in the link goes, and these operations can realize through software arrangements fully, thus lay the foundation for distributed control operation.
During the ROADM system applies, need from service dispatching, network change maybe be very frequent; As far as the two-forty wavelength signals; In case the variation of transmission path takes place, and physical quantitys such as loss, chromatic dispersion also can produce bigger variation, possibly cause the decline of signal transmission quality.Therefore, the network for the ROADM system forms certainly will will have the dispersion compensation solution of maneuverability more.
At present; There is the three generations in common ROADM system: WB (Wavelength Blocker; Wavelength blocker), PLC (Planar Lightwave Circuits; Planar optical waveguide), WSS (Wavelength SelectiveSwitch, wavelength-selective switches), that wherein best is third generation wavelength-selective switches type ROADM.At present; The core technology of wavelength-selective switches is a spatial light modulation technology; Mainly contain at present: MEMS (Micro Electro MechanicalSystems; Microelectromechanical systems), LC (Liquid Crystal, liquid crystal) and LCoS (Liquid Crystal on Silicon, liquid crystal on silicon) technology.There is the device supplier to release the programmable optical processor WaveShaper of enhancement mode WSS-recently abroad, enlarged the flexibility of WSS based on liquid crystal on silicon technology (LCoS).Wavelength-selective switches adopts the free space optical exchange, can support that (dimension, Degree), WSS type ROADM becomes the one preferred technique of the above ROADM of 4 dimensions to higher port number gradually.
Chromatic dispersion is one of transmission characteristic of optical fiber, and the CHROMATIC DISPERSION IN FIBER OPTICS phenomenon is totally unfavorable to optical fiber communication.Usually used telecommunication optical fiber is positive dispersion in the communication wavelengths section, need come optical fiber dispersion is compensated with the dispersion compensation device with negative dispersion characteristic of certain-length in the long Distance Transmission.The optical fiber and digital communications be a series of pulse codes, NRZ (No Return Zero, non-return-to-zero coding) sign indicating number type for example.For positive chirp signal, the positive dispersion meeting makes pulse stretching, and the pulse stretching meeting in the transmission causes pulse and front and back adjacent pulse overlaid, produces intersymbol interference, causes error code.When the dispersion compensation device that utilization has a negative dispersion characteristic compensated, situation was just in time opposite, the phenomenon of pulsewidth compression can occur.Compensates but in link, use dispersion compensation device, not only when increasing system cost, can introduce and insert loss, delay variation, nonlinear effect etc., and the chromatic dispersion of partial dispersion compensating device is fixing nonadjustable that bandwidth of operation is limited.
Summary of the invention
The objective of the invention is in order to overcome the deficiency of above-mentioned background technology; Dispersion Compensation Systems and the method for a kind of wavelength-selective switches type ROADM are provided; When ROADM realizes the flexible net wavelength configuration; The characteristics of utilization WSS type ROADM self are carried out tunable dispersion compensation, and the residual dispersion after also can compensating the segmentation fixed optics through WSS compensates, and is realizing reducing cost, improving in the high-speed light network flexibly transmission quality.
The Dispersion Compensation Systems of wavelength-selective switches type ROADM provided by the invention; Comprise WSS type ROADM, network management system, chromatic dispersion monitoring subsystem, optical switch and some optical branching devices that is used to monitor chromatic dispersion; Each output link of WSS module is connected respectively to one of some optical branching devices that are used to monitor chromatic dispersion among the ROADM; Each optical branching device is told a certain proportion of light signal and is delivered to optical switch; Optical switch is connected to the chromatic dispersion monitoring subsystem, network management system respectively with optical switch, chromatic dispersion monitoring subsystem, ROADM in the WSS module link to each other.
In technique scheme, said WSS type ROADM comprises WSS module and some fiber couplers, has colourless, non-directional, non-blocking, no lattice characteristic, and has power equalization and chromatic dispersion compensating function; WSS type ROADM is multidimensional ROADM, comprises the optical fiber link of various dimensions, and each dimension all has a pair of optical fiber link to link to each other with other node; Each ROADM also comprises many to road up and down, is used for current flexibly road signal up and down; The input of each dimension carries out filtering through an adjustable wavelength-selective switches of bandwidth to signal, transfers to different output ports then respectively; The output of each dimension all is to be compound in the output optical fibre through the signal of a fiber coupler with all directions in the ROADM earlier, transfers to other node then.
In technique scheme; Said WSS module comprises an input optical fibre, many output optical fibres, polarization diversity device, cylindrical mirror, grating, collimating lens and programmable spatial light modulators, and after input optical signal got into the WSS module through input optical fibre, the polarization diversity device converted the light signal of input optical fibre output and the consistent light signal of the maximum polarization state of grating diffration to; Behind cylindrical mirror reflection and collimating lens collimation, carry out beam split to grating then; Input optical signal is pressed different wave length at space development, return collimating lens again, collimating lens is assembled the corresponding spectrum component of each wavelength; The handled unit that reflexes to spatial light modulator through cylindrical mirror carries out the adjustment of amplitude and phase place; Through network management system the amplitude and the phase place of each optical channel of place service band are carried out flexible programming, the frequency spectrum that spatial light modulator was handled turns back to grating through cylindrical mirror and collimating lens again; Synthesize light signal with particular range of wavelengths; Return collimating lens then, after collimating lens focuses on, reflex to the polarization diversity element by cylindrical mirror; Recover the polarization state of output light signal through the polarization diversity element after, export a certain appointment output optical fibre port to.
In technique scheme, said each optical branching device is told 1～10% light signal and is delivered to optical switch.
In technique scheme, said network management system is carried out out-of-band communication through general-purpose interface bus, local area network (LAN) or USB.
The present invention also provides the dispersion compensation method of a kind of wavelength-selective switches type ROADM based on above-mentioned Dispersion Compensation Systems; May further comprise the steps: A, when signal changes when ROADM carries out wavelength configuration or in the link; The chromatic dispersion monitoring subsystem is through the switching of optical switch; Channel spacing with centre wavelength, bandwidth and the WSS of service band is a benchmark, automatically the output light signal in all output links is carried out the chromatic dispersion monitoring; B, exceeded the dispersion tolerance of regulation if judge the chromatic dispersion of output link; The chromatic dispersion monitoring subsystem is given network management system with the group delay value τ of light signal in this output link with corresponding wavelength X together; Network management system is according to group delay value τ that obtains and corresponding wavelength X; Calculate the phase that WSS need compensate, and the phase place of control WSS corresponding light processing unit, the single channel or the multichannel dispersion compensation of realization service band.
In technique scheme; Network management system described in the step B is according to group delay value τ that obtains and corresponding wavelength X; By group delay τ and phase, angular frequency, and wavelength X between relation, the transmission range and the abbe number of different test links, calculate the phase place that WSS need compensate.
In technique scheme, the relation between said group delay τ and phase, angular frequency and the wavelength X is:
In technique scheme; It is further comprising the steps of among the step B: after said network management system calculates the phase place of WSS needs compensation according to the group delay value τ that obtains with corresponding wavelength X; Regulate the phase place of the corresponding optical processing of WSS unit, carry out dispersion compensation to single channel or multichannel in different length, the dissimilar optical fiber link.
In technique scheme; Further comprising the steps of: as to adopt fixed dispersion compensation module that transmission link is carried out dispersion compensation earlier; Then through above-mentioned steps A, B, calculate the phase place that WSS need compensate after, the phase place of regulating the corresponding optical processing of WSS unit; Residual dispersion to after the compensation of link segmentation fixed optics carries out single channel or multichannel dispersion compensation, optimizes signal transmission quality.
Compared with prior art, advantage of the present invention is following:
The present invention is when ROADM realizes the flexible net wavelength configuration; The characteristics of utilization WSS type ROADM self are carried out tunable dispersion compensation, except can directly being used for the dispersion compensation, for the residual dispersion through also existing in the optical fiber link after the fixed dispersion compensation module compensation; Also can compensate through WSS; Thereby when realizing flexibly the high-speed light network, reduce cost, improve transmission quality, ROADM networking and practical engineering application are significant for promoting.
Description of drawings
Fig. 1 is the Dispersion Compensation Systems structural representation of wavelength-selective switches type ROADM.
Fig. 2 is the sketch map based on the three-dimensional ROADM of wavelength-selective switches.
Fig. 3 is the WSS module diagram based on spatial light modulator.
Fig. 4 is the test sketch map of the dispersion compensation method of wavelength-selective switches type ROADM.
Fig. 5 is the chromatic dispersion test result's before and after the 20km G655 optical fiber dispersion compensation a sketch map.
Fig. 6 is the chromatic dispersion test result's before and after the four-way dispersion compensation in the 20km G655 optical fiber a sketch map.
Fig. 7 is the chromatic dispersion test result's before and after the 20km G652 optical fiber dispersion compensation a sketch map.
Fig. 8 is the chromatic dispersion test result's before and after the four-way dispersion compensation in the 20km G652 optical fiber a sketch map.
Fig. 9 is a sketch map of the residual dispersion after the compensation of link segmentation fixed optics being implemented dispersion compensation.
Figure 10 is the sketch map of 20km G652 optical fiber through the chromatic dispersion test result before and after dispersion compensation module and the wavelength-selective switches dispersion compensation.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is made further detailed description.
Referring to shown in Figure 1, the embodiment of the invention provides the Dispersion Compensation Systems of a kind of wavelength-selective switches type ROADM, comprises WSS type ROADM, network management system, chromatic dispersion monitoring subsystem, optical switch and some optical branching devices that is used to monitor chromatic dispersion.Each output link of WSS module is connected respectively to one of some optical branching devices that are used to monitor chromatic dispersion among the ROADM; Each optical branching device is told certain proportion (1～10%; What use among Fig. 1 is 3: 97 optical branching device) light signal deliver to optical switch; Optical switch is connected to the chromatic dispersion monitoring subsystem, network management system respectively with optical switch, chromatic dispersion monitoring subsystem, ROADM in the WSS module link to each other.Network management system can be passed through GPIB (General Purpose Interface Bus; General-purpose interface bus), LAN (Local Area Network; Local area network (LAN)), USB communication interfaces such as (Universal Serial Bus, USBs) and system equipment carry out out-of-band communication.
Referring to shown in Figure 2, WSS type ROADM comprises WSS module and some fiber couplers, has colourless, non-directional, non-blocking, no lattice characteristic; And have power equalization and a chromatic dispersion compensating function; WSS type ROADM is multidimensional ROADM, comprises the optical fiber link of various dimensions, and each dimension all has a pair of optical fiber link to link to each other with other node; Provide three-dimensional ROADM among Fig. 2, three dimensions are always represented with east, west, the north respectively; ROADM also comprises many to road up and down, is used for current flexibly road signal up and down; The input of each dimension carries out filtering through an adjustable wavelength-selective switches of bandwidth to signal, transfers to different output ports then respectively; The output of each dimension all is to be compound in the output optical fibre through the signal of a fiber coupler with all directions in the ROADM earlier, transfers to other node then.
Referring to shown in Figure 3, the WSS module comprises an input optical fibre, many output optical fibres, polarization diversity device, cylindrical mirror, grating, collimating lens and programmable SLM (Spatial Light Modulator, spatial light modulator); After input optical signal gets into the WSS module through input optical fibre; The polarization diversity device converts the light signal of input optical fibre output and the consistent light signal of the maximum polarization state of grating diffration to, then through cylindrical mirror reflect and the collimating lens collimation after carry out beam split to grating, input optical signal is pressed different wave length at space development; Return collimating lens again; Collimating lens is assembled the corresponding spectrum component of each wavelength, and the handled unit that reflexes to spatial light modulator through cylindrical mirror carries out the adjustment of amplitude and phase place, through network management system the amplitude and the phase place of each optical channel of place service band is carried out flexible programming; The frequency spectrum that spatial light modulator was handled; Turn back to grating through cylindrical mirror and collimating lens again, synthesize light signal, return collimating lens then with particular range of wavelengths; After collimating lens focuses on; Reflex to the polarization diversity element by cylindrical mirror, after recovering to export the polarization state of light signal through the polarization diversity element, export a certain appointment output optical fibre port to.
On the basis of above-mentioned Dispersion Compensation Systems, the embodiment of the invention also provides the dispersion compensation method of a kind of wavelength-selective switches type ROADM, may further comprise the steps:
A, when signal changes when ROADM carries out wavelength configuration or in the link; The chromatic dispersion monitoring subsystem is through the switching of optical switch; Channel spacing with centre wavelength, bandwidth and the WSS of service band is a benchmark, automatically the output light signal in all output links is carried out the chromatic dispersion monitoring;
B, exceeded the dispersion tolerance of regulation if judge the chromatic dispersion of output link; The chromatic dispersion monitoring subsystem is given network management system with the group delay value τ of light signal in this output link with corresponding wavelength X together; Network management system is according to group delay value τ that obtains and corresponding wavelength X; Calculate the phase that WSS need compensate, and the phase place of control WSS corresponding light processing unit, the single channel or the multichannel dispersion compensation of realization service band.
In the embodiment of the invention to the test of the Dispersion Compensation Systems of wavelength-selective switches type ROADM; Referring to shown in Figure 4; Send flashlight through the test link transmission by testing light source, be routed to the output link of appointment then by the WSS module in the ROADM node, through EDFA (Erbium-doped Optical Fiber Amplifier; Erbium-doped fiber amplifier) after the amplification; Be connected respectively to one of some optical branching devices that are used to monitor chromatic dispersion, tell a certain proportion of light signal (1～10%, what use among Fig. 4 is 3: 97 optical branching device) through optical branching device and deliver to optical switch; Optical switch is connected to the chromatic dispersion monitoring subsystem, and the chromatic dispersion monitoring subsystem is given network management system with the group delay value τ of nominative testing link with corresponding wavelength X together.Because have chromatic dispersion in the optical fiber link, the group delay of light depends on wavelength, along the light pulse meeting generation broadening of spread fiber, thus the decay of signal when causing adjacent pulse overlapping.Network management system is according to the group delay value τ that obtains and corresponding wavelength X, by the relation between group delay τ and phase, angular frequency and the wavelength X:
20km is the chromatic dispersion test result of optical fiber dispersion compensation front and back G.655; Referring to shown in Figure 5; Wherein dotted line is through the 20km chromatic dispersion test result after the Optical Fiber Transmission G.655 before the dispersion compensation; Solid line is after drawing the phase place of WSS needs compensation according to theoretical analysis and calculation, and the phase place of regulating the corresponding optical processing of WSS unit is carried out the chromatic dispersion test result behind the dispersion compensation.The result shows, is centre wavelength with 1550nm, can in the wavelength band of 0.8nm, realize dispersion compensation well.
20km is the chromatic dispersion test result before and after the four-way dispersion compensation in the optical fiber G.655; Referring to shown in Figure 6; Wherein dotted line is through the 20km chromatic dispersion test result after the Optical Fiber Transmission G.655 before the dispersion compensation; Solid line is after drawing the phase place of WSS needs compensation according to theoretical analysis and calculation, and the phase place of regulating the corresponding optical processing of WSS unit is carried out the dispersion compensation chromatic dispersion test result of four optical channels later on.The result shows that in the group delay curve behind the dispersion compensation, there are four tangible smooth steps four passage corresponding positions, and explanation can realize four passages are carried out dispersion compensation simultaneously.
20km is the chromatic dispersion test result of optical fiber dispersion compensation front and back G.652; Referring to shown in Figure 7; Wherein dotted line is through the 20km chromatic dispersion test result after the Optical Fiber Transmission G.652 before the dispersion compensation; Solid line is that the phase place of regulating the corresponding optical processing of WSS unit is carried out the later chromatic dispersion test result of dispersion compensation after drawing the phase place of WSS needs compensation according to theoretical analysis and calculation.Because G.652 the CHROMATIC DISPERSION IN FIBER OPTICS coefficient is bigger; Be about 17ps/ (nmkm); Dispersion Compensation Systems in the embodiment of the invention receives the restriction of WSS device itself to CHROMATIC DISPERSION IN FIBER OPTICS compensation range G.652; With 1550nm is centre wavelength, can in the wavelength band of 0.192nm, realize dispersion compensation preferably.
20km is the chromatic dispersion test result before and after the four-way dispersion compensation in the optical fiber G.652; Referring to shown in Figure 8; Wherein dotted line is through the 20km chromatic dispersion test result after the Optical Fiber Transmission G.652 before the dispersion compensation; Solid line is that the phase place of regulating the corresponding optical processing of WSS unit is carried out the later chromatic dispersion test result of dispersion compensation after drawing the phase place of WSS needs compensation according to theoretical analysis and calculation.The result shows that in the group delay curve behind the dispersion compensation, also there are four narrower smooth steps four passage corresponding positions, explain and also can realize simultaneously four passages are carried out dispersion compensation.
The embodiment of the invention can also be implemented dispersion compensation to the residual dispersion after the compensation of link segmentation fixed optics; Referring to shown in Figure 9; Adopting fixedly, DCM (Dispersion Compensation Module, dispersion compensation module) passes through above-mentioned steps A, B then to the diffusing compensation of the advanced circumstances in which people get things ready for a trip of certain section transmission link; After calculating the phase place that WSS need compensate; Regulate the phase place of the corresponding optical processing of WSS unit, the residual dispersion after the compensation of link segmentation fixed optics is carried out single channel or multichannel dispersion compensation, optimize signal transmission quality.
20km G.652 optical fiber dispersion compensating module and wavelength-selective switches carries out the chromatic dispersion test result before and after the dispersion compensation, and referring to shown in Figure 10, wherein dotted line is directly through the 20km chromatic dispersion test result after the Optical Fiber Transmission G.652; Chain-dotted line be through 20km G.652 Optical Fiber Transmission and through fixed dispersion compensation module compensation 20km G.652 optical fiber cause the chromatic dispersion test result after the chromatic dispersion, the result shows through still having residual dispersion after the fixed dispersion compensation module compensation; Solid line is to adopt fixed dispersion compensation module that transmission link is carried out dispersion compensation earlier; Then through above-mentioned steps A, B; Draw the phase place of WSS needs compensation according to theoretical analysis and calculation after; Regulate the phase place of the corresponding optical processing of WSS unit, the residual dispersion after the compensation of link segmentation fixed optics is carried out the later chromatic dispersion test result of dispersion compensation.The result shows, in the 4nm scope, can realize residual dispersion is compensated preferably.
Obviously; Those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention; Belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention comprises these changes and modification interior.The content of not doing in this specification to describe in detail belongs to this area professional and technical personnel's known prior art.
Claims (10)
1. the Dispersion Compensation Systems of a wavelength-selective switches type ROADM; It is characterized in that: comprise WSS type ROADM, network management system, chromatic dispersion monitoring subsystem, optical switch and some optical branching devices that is used to monitor chromatic dispersion; Each output link of WSS module is connected respectively to one of some optical branching devices that are used to monitor chromatic dispersion among the ROADM; Each optical branching device is told a certain proportion of light signal and is delivered to optical switch; Optical switch is connected to the chromatic dispersion monitoring subsystem, network management system respectively with optical switch, chromatic dispersion monitoring subsystem, ROADM in the WSS module link to each other.
2. the Dispersion Compensation Systems of wavelength-selective switches type ROADM as claimed in claim 1; It is characterized in that: said WSS type ROADM comprises WSS module and some fiber couplers; Have colourless, non-directional, non-blocking, no lattice characteristic, and have power equalization and chromatic dispersion compensating function; WSS type ROADM is multidimensional ROADM, comprises the optical fiber link of various dimensions, and each dimension all has a pair of optical fiber link to link to each other with other node; Each ROADM also comprises many to road up and down, is used for current flexibly road signal up and down; The input of each dimension carries out filtering through an adjustable wavelength-selective switches of bandwidth to signal, transfers to different output ports then respectively; The output of each dimension all is to be compound in the output optical fibre through the signal of a fiber coupler with all directions in the ROADM earlier, transfers to other node then.
3. the Dispersion Compensation Systems of wavelength-selective switches type ROADM as claimed in claim 2; It is characterized in that: said WSS module comprises an input optical fibre, many output optical fibres, polarization diversity device, cylindrical mirror, grating, collimating lens and programmable spatial light modulators, and after input optical signal got into the WSS module through input optical fibre, the polarization diversity device converted the light signal of input optical fibre output and the consistent light signal of the maximum polarization state of grating diffration to; Behind cylindrical mirror reflection and collimating lens collimation, carry out beam split to grating then; Input optical signal is pressed different wave length at space development, return collimating lens again, collimating lens is assembled the corresponding spectrum component of each wavelength; The handled unit that reflexes to spatial light modulator through cylindrical mirror carries out the adjustment of amplitude and phase place; Through network management system the amplitude and the phase place of each optical channel of place service band are carried out flexible programming, the frequency spectrum that spatial light modulator was handled turns back to grating through cylindrical mirror and collimating lens again; Synthesize light signal with particular range of wavelengths; Return collimating lens then, after collimating lens focuses on, reflex to the polarization diversity element by cylindrical mirror; Recover the polarization state of output light signal through the polarization diversity element after, export a certain appointment output optical fibre port to.
4. like the Dispersion Compensation Systems of claim 1 or 2 or 3 described wavelength-selective switches type ROADM, it is characterized in that: said each optical branching device is told 1～10% light signal and is delivered to optical switch.
5. like the Dispersion Compensation Systems of claim 1 or 2 or 3 described wavelength-selective switches type ROADM, it is characterized in that: said network management system is carried out out-of-band communication through general-purpose interface bus, local area network (LAN) or USB.
6. dispersion compensation method based on the wavelength-selective switches type ROADM of each said Dispersion Compensation Systems of claim 1 to 5 may further comprise the steps:
A, when signal changes when ROADM carries out wavelength configuration or in the link; The chromatic dispersion monitoring subsystem is through the switching of optical switch; Channel spacing with centre wavelength, bandwidth and the WSS of service band is a benchmark, automatically the output light signal in all output links is carried out the chromatic dispersion monitoring;
B, exceeded the dispersion tolerance of regulation if judge the chromatic dispersion of output link; The chromatic dispersion monitoring subsystem is given network management system with the group delay value τ of light signal in this output link with corresponding wavelength X together; Network management system is according to group delay value τ that obtains and corresponding wavelength X; Calculate the phase that WSS need compensate, and the phase place of control WSS corresponding light processing unit, the single channel or the multichannel dispersion compensation of realization service band.
7. the dispersion compensation method of wavelength-selective switches type ROADM as claimed in claim 6; It is characterized in that: network management system described in the step B is according to group delay value τ that obtains and corresponding wavelength X; By group delay τ and phase, angular frequency, and wavelength X between relation, the transmission range and the abbe number of different test links, calculate the phase place that WSS need compensate.
8. the dispersion compensation method of wavelength-selective switches type ROADM as claimed in claim 7 is characterized in that: the relation between said group delay τ and phase, angular frequency and the wavelength X is:
Wherein, ω=2 π C/ λ, C is the light velocity.
9. the dispersion compensation method of wavelength-selective switches type ROADM as claimed in claim 8; It is characterized in that: further comprising the steps of among the step B: after said network management system calculates the phase place of WSS needs compensation according to the group delay value τ that obtains with corresponding wavelength X; Regulate the phase place of the corresponding optical processing of WSS unit, carry out dispersion compensation to single channel or multichannel in different length, the dissimilar optical fiber link.
10. like the dispersion compensation method of each described wavelength-selective switches type ROADM of claim 6 to 9; It is characterized in that: further comprising the steps of: adopt fixed dispersion compensation module that transmission link is carried out dispersion compensation earlier; Then through above-mentioned steps A, B, calculate the phase place that WSS need compensate after, the phase place of regulating the corresponding optical processing of WSS unit; Residual dispersion to after the compensation of link segmentation fixed optics carries out single channel or multichannel dispersion compensation, optimizes signal transmission quality.
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