CN103197388B - C+L band wavelength selector switch and its implementation and processing unit - Google Patents
C+L band wavelength selector switch and its implementation and processing unit Download PDFInfo
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- CN103197388B CN103197388B CN201310137865.8A CN201310137865A CN103197388B CN 103197388 B CN103197388 B CN 103197388B CN 201310137865 A CN201310137865 A CN 201310137865A CN 103197388 B CN103197388 B CN 103197388B
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Abstract
The invention discloses a kind of C+L band wavelength selector switch and its implementation and processing unit, this processing unit comprises input-output optical fiber array, polarization diversity element, cylindrical mirror, collimator lens array, grating array and spatial light modulator able to programme, C, L-band input optical signal enters polarization diversity element adjustment polarization state through fiber array respectively, again after cylindrical mirror reflection and collimator lens array collimation, different wave length is pressed at space development by grating array, after reflex to through collimator lens array and cylindrical mirror the adjustment that spatial light modulator carries out amplitude and phase place, then C-band and L-band output optical signal is synthesized through cylindrical mirror and collimator lens array back light grid array, exported by the appointment output optical fibre port of fiber array after recovering polarization state.The present invention, by the ingehious design in light path, only just achieves the dynamic-configuration to C-band and L-band wavelength resource by a spatial light modulator, and structure is simple, considerably reduces system cost.
Description
Technical field
The present invention relates to wavelength-selective switches, be specifically related to C+L band wavelength selector switch and its implementation and processing unit.
Background technology
In recent years, communication service (comprising with multimedia services such as speech, data and video images) develops year by year, particularly the portfolio of data and transmission of video increases rapidly, the requirement of the transmission capacity of optical-fiber network, speed, Distance geometry transmission quality is improved constantly, also particularly pays close attention to dirigibility that optical-fiber network builds simultaneously and build and the reduction of operation and maintenance cost.
DWDM dense wavelength division multiplexing system is current modal photosphere networking technology, the transfer capability of tens of wavelength wavelength even up to a hundred can be realized by multiplexing demultiplexing device, but current wavelength-division multiplex system, its in essence or the line system of a point-to-point, most photosphere networking can only pass through the optical link system constructing that terminal station (TM) realizes.The appearance of OADM optical add/drop multiplexer, has stepped the evolution of networking from point to points to looped network gradually.But due to the function that OADM is limited, usually can only the optical channel of fixed number and wavelength up and down, really do not realize photosphere networking flexibly.Therefore, in a sense, early stage wavelength-division multiplex system does not realize photosphere networking truly, is difficult to the requirement meeting business network IPization and packetizing, the traffic scheduling ability, reliability, maintainability, extensibility, manageability etc. of such as network.This situation is until the appearance of ROADM (ReconfigurableOptical Add-Drop Multiplexer, reconstructable OADM equipment) is just improved.
ROADM is a kind of network element being similar to SDH ADM photosphere, it can complete the road up and down (Add/Drop) of optical channel on one node, and other cross scheduling of wavelength level between break-through optical channel, configuration and the adjustment of upper and lower road wavelength is realized by the ROADM subsystem in remote software control network element.The ROADM with dynamic configurability is the important foundation that optical-fiber network " intelligence " realizes, based on the construction of bearer network provide brand-new thinking.
ROADM adopts three kinds of technology usually: planar lightwave circuit (Planar Lightwave Circuits, PLC), wavelength blocker (Wavelength Blocker, and wavelength-selective switches (WavelengthSelective Switch, WSS) WB).Wherein, wavelength-selective switches adopts free space optical to exchange, and can support higher port number (dimension, Degree), therefore, WSS type ROADM becomes the one preferred technique of ROADM of future generation gradually.Spatial light modulator (SLM, Spatial Light Modulator) be the technological core of WSS, implementation mainly contains: microelectromechanical systems (MEMS, Micro ElectroMechanicalSystems), liquid crystal (LC, Liquid Crystal) and Liquide Crystal On Silicon (LCoS, Liquid Crystal on Silicon).
At present, ROADM is from simple bidimensional framework to more complicated multidimensional (> 2 ties up) architecture evolution, and, in order to meet the ever-increasing demand of message capacity, system works wave band expands to L-band (1565nm ~ 1625nm) by original C-band (1530nm ~ 1565nm).The enhancement mode WSS of nearest release expands the dirigibility of WSS further, this WSS realizes based on the programmable optical processor WaveShaper of Liquide Crystal On Silicon (LCoS), but the high resolving power of acquisition, operating wavelength range can not comprise C and L two wave bands, an equipment, only for some specific wave bands, makes it will be restricted in Future broadband optical network communication.So it is significant for promoting Future broadband optical-fiber network construction and ROADM networking and practical engineering application how research realizes structure C+L band wavelength selector switch that is simple and advantage of lower cost.
Summary of the invention
Technical matters to be solved by this invention solves as how simple structure and relatively low cost realize the problem of high resolving power C+L band wavelength selector switch WSS.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is to provide a kind of processing unit of C+L band wavelength selector switch, comprise input-output optical fiber array, polarization diversity element, cylindrical mirror, collimator lens array, grating array and spatial light modulator able to programme, C-band and L-band input optical signal export described polarization diversity element to through the corresponding input optical fibre of described input-output optical fiber array respectively, the polarization state of described polarization diversity element adjustment C-band and L-band input optical signal, again after described cylindrical mirror reflection and described collimator lens array collimation, different wave length is pressed at space development by described grating array, the light signal of different wave length carries out the adjustment of amplitude and phase place through the respective handling unit that described collimator lens array and described cylindrical mirror reflex to described spatial light modulator, light signal after described spatial light modulator adjustment, return described grating array through described cylindrical mirror and collimator lens array again and synthesize C-band and L-band output optical signal, C-band and L-band output optical signal are after described collimator lens array focuses on, the polarization state that polarization diversity element recovers C-band and L-band output optical signal is reflexed to again by described cylindrical mirror, finally export the appointment output optical fibre port of described input-output optical fiber array respectively to.
In above-mentioned processing unit, described input-output optical fiber array is arranged by C-band optical fiber group and L-band optical fiber group two and forms side by side, often organize optical fiber group and comprise an input optical fibre and the output optical fibre equal with the output port quantity of wavelength-selective switches respectively, described C-band optical fiber group and L-band optical fiber group stagger a fiber arrangement up and down.
In above-mentioned processing unit, the input optical fibre in described C-band optical fiber group is positioned at the top, and the input optical fibre in described L-band optical fiber group lays respectively at bottom; Or the input optical fibre in described C-band optical fiber group is positioned at bottom, the input optical fibre in described L-band optical fiber group lays respectively at the top.
Present invention also offers a kind of C+L band wavelength selector switch, comprise: input port, multiple output port and a processing unit, described output port place is provided with a WDM coupling mechanism, output port place described in each is respectively equipped with a 2nd WDM coupling mechanism, described processing unit comprises input-output optical fiber array, polarization diversity element, cylindrical mirror, collimator lens array, grating array and spatial light modulator able to programme
The input optical signal that input port from wavelength-selective switches inputs is divided into C-band and L-band input optical signal by the one WDM coupling mechanism, and exports the corresponding input optical fibre port of described input-output optical fiber array respectively to;
The C-band exported by corresponding input optical fibre port and L-band input optical signal adjust polarization state through polarization diversity element, then after cylindrical mirror reflection and collimator lens array collimation, export grating array to successively;
C-band and L-band input optical signal are pressed different wave length at space development by grating array, and reflex to spatial light modulator through collimator lens array collimation and cylindrical mirror successively again;
Spatial light modulator carries out amplitude and phase place adjustment to the light signal of different wave length respectively, then reflects and back light grid array after collimator lens array collimation through cylindrical mirror successively;
The light signal of different wave length is synthesized C-band and L-band output optical signal by grating array, then reflexes to polarization diversity element through collimator lens array collimation and cylindrical mirror successively;
Polarization diversity element recovers the polarization state of C-band and L-band output optical signal, and exports the appointment output optical fibre port of input-output optical fiber array to;
The output port of 2nd WDM coupling mechanism by the C-band exported by output optical fibre and L-band light signal conjunction ripple and through wavelength-selective switches exports.
In above-mentioned C+L band wavelength selector switch, described input-output optical fiber array is arranged by C-band optical fiber group and L-band optical fiber group two and forms side by side, often organize optical fiber group and comprise an input optical fibre and the output optical fibre equal with the output port quantity of wavelength-selective switches respectively, described C-band optical fiber group and L-band optical fiber group stagger a fiber arrangement up and down.
Present invention also offers a kind of implementation method of C+L band wavelength selector switch, comprise the following steps:
Input optical signal is divided into C-band and L-band input optical signal, and exports the corresponding input optical fibre port of input-output optical fiber array respectively to;
The C-band exported by corresponding input optical fibre port and L-band input optical signal adjust polarization state through polarization diversity element, then after cylindrical mirror reflection and collimator lens array collimation, export grating array to successively;
C-band and L-band input optical signal are pressed different wave length at space development by grating array, and reflex to spatial light modulator through collimator lens array collimation and cylindrical mirror successively again;
Spatial light modulator carries out amplitude and phase place adjustment to the light signal of different wave length respectively, then reflects and back light grid array after collimator lens array collimation through cylindrical mirror successively;
The light signal of different wave length is synthesized C-band and L-band output optical signal by grating array, then reflexes to polarization diversity element through collimator lens array collimation and cylindrical mirror successively;
Polarization diversity element recovers the polarization state of C-band and L-band output optical signal, and exports the appointment output optical fibre port of input-output optical fiber array to;
The C-band export output optical fibre and L-band light signal close ripple and export.
The present invention, by the ingehious design in light path, only by a spatial light modulator, programmed process is carried out to C-band and L-band input optical signal, achieve the dynamic-configuration of C-band and L-band wavelength resource, do not need the WSS using different-waveband, also do not increase the quantity of WSS, structure is simple, considerably reduces system cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of the band wavelength of C+L shown in specific embodiment of the invention selector switch (1 × 4);
Fig. 2 is the schematic diagram of the processing unit in the band wavelength of C+L shown in Fig. 1 selector switch (1 × 4);
Fig. 3 is the schematic diagram of the input-output optical fiber array in the band wavelength of C+L shown in specific embodiment of the invention selector switch (1 × 4);
Fig. 4 is input and output grating array and light path schematic diagram in the present invention;
Fig. 5 is spatial light modulator of the present invention and spectral distribution schematic diagram.
Embodiment
C+L band wavelength selector switch provided by the invention, by the ingehious design in light path, only just achieve the dynamic-configuration to C-band and L-band wavelength resource by a spatial light modulator, and transfer to the output port of specifying respectively, in conjunction with Figure of description, the present invention is described in detail with this specific embodiment of 1 × 4 wavelength-selective switches below.
Obviously, technical scheme provided by the invention is not limited to 1 × 4 wavelength-selective switches, and namely those skilled in the art as required, by the choose reasonable to respective element, can be applicable to the wavelength-selective switches of more multiport completely.
Fig. 1 is the structural representation of the band wavelength of C+L shown in specific embodiment of the invention selector switch (1 × 4), Fig. 2 is the schematic diagram of the processing unit in the band wavelength of C+L shown in Fig. 1 selector switch (1 × 4), as shown in Figure 1 and Figure 2, C+L band wavelength selector switch provided by the invention, comprising: input port 10, multiple output port 40 and a processing unit 30.Output port 10 place is provided with a WDM coupling mechanism 20, and each output port 40 place is respectively equipped with a 2nd WDM coupling mechanism 50.
Processing unit comprises input-output optical fiber array 31, polarization diversity element 32, cylindrical mirror 33, collimator lens array 34, grating array 35 and spatial light modulator able to programme (SLM) 36.
The structure of input-output optical fiber array 31 as shown in Figure 3, be made up of side by side C-band optical fiber group 311 and L-band optical fiber group 312 liang row, C-band optical fiber group 311 comprises a C-band input optical fibre 3111 and the C-band output optical fibre 3112 equal with the output port quantity of wavelength-selective switches, and L-band optical fiber group 312 comprises a L-band input optical fibre 3121 and the L-band output optical fibre 3122 equal with the output port quantity of wavelength-selective switches.C-band optical fiber group 311 and L-band optical fiber group 312 stagger along the direction that is arranged above and below of optical fiber a fiber arrangement.In the present embodiment, the left side one row are C-band optical fiber groups 311, the right one row are L-band optical fiber groups 312, C-band optical fiber group 311 and L-band optical fiber group 312 comprise five optical fibers respectively, uppermost in C-band optical fiber group 311 is C-band input optical fibre, and what be arranged in order below is C-band output optical fibre 1 ~ 4; In the input-output optical fiber L-band optical fiber group 312 of the right L-band, nethermost is L-band input optical fibre, and what be arranged in order above is L-band output optical fibre 1 ~ 4.C-band output optical fibre is concordant with L-band output optical fibre, staggers in C-band input optical fibre and L-band input optical fibre position, its objective is in order to by C-band and L-band spectrum, the upper-lower position in collimator lens array, grating array and spatial light modulator separates.
The input optical signal that input port 10 from wavelength-selective switches inputs is divided into C-band and L-band input optical signal by the one WDM coupling mechanism 20, and export the corresponding input optical fibre port of input-output optical fiber array 31 respectively to, namely C-band input optical signal exports C-band input optical fibre 3111 to, and C-band input optical signal exports L-band input optical fibre 3121 to.
The C-band input optical signal exported by C-band input optical fibre 3111 and L-band input optical fibre 3121 and L-band input optical signal adjust polarization state through polarization diversity element 32, make it consistent with the maximum polarization state of the diffraction of grating array 35 respectively, then be reflected into collimator lens array 34 by cylindrical mirror 33, after collimator lens array 34 collimates, export grating array 35 to.
C-band input optical signal and L-band input optical signal are carried out light splitting by grating array 35 respectively, and press different wave length at space development, and as shown in Figure 4, the first half of grating array 35 is C-band grating, for carrying out light splitting to C-band light signal; The latter half of grating array 35 is L-band grating, for carrying out light splitting to L-band light signal.C-band grating light path schematic diagram is as shown in upper right dotted box, C-band incident light (1530 ~ 1565nm) is incident to C-band grating surface, through C-band optical grating diffraction, C-band light signal is separated in space, C-band emergent light wavelength separates successively from left to right by 1530 ~ 1565nm, and the angle of each wavelength light is by grating fringe interval d
cand incidence angle θ determines.L-band grating light path schematic diagram is as shown in the dotted box of bottom right, L-band incident light (1565 ~ 1625nm) is incident to L-band grating surface, through L-band optical grating diffraction, L-band light signal is separated in space, L-band emergent light wavelength separates successively from left to right by 1565 ~ 1625nm, and the angle of each wavelength light is by grating fringe interval d
land incidence angle θ determines.Collimate through collimator lens array 34 from the light signal of the different wave length of grating array 35 output, the spectrum component corresponding to each wavelength is assembled, and reflexes to spatial light modulator 36 by cylindrical mirror 33 again;
Spatial light modulator 36 can carry out flexible programming respectively by the amplitude of each optical channel to C-band and L-band and phase place, amplitude and phase place adjustment are carried out to the light signal of different wave length, as shown in Figure 5, C-band spectrum takes up space some processing units of photomodulator the first half, and L-band spectrum takes up space some processing units of photomodulator the latter half.The adjustment that respective handling unit carries out amplitude and phase place is occupied to spatial light modulator, respectively flexible programming is carried out to the amplitude of each optical channel of C and L-band and phase place, filtering can be carried out to the frequency spectrum of C and L-band respectively.Light signal after spatial light modulator 36 processes reflects into collimator lens array 34 through cylindrical mirror 33, collimates rear back light grid array 35 by collimator lens array 34;
The light signal of different wave length is synthesized the C-band output optical signal and L-band output optical signal with particular range of wavelengths by grating array 35, and then collimates through collimator lens array 34, reflexes to polarization diversity element 32 by cylindrical mirror 33;
Polarization diversity element 32 recovers the polarization state of C-band output optical signal and L-band output optical signal, then exports the appointment output optical fibre port of input-output optical fiber array 31 to;
The C-band output optical signal exported by input-output optical fiber array 31 and L-band output optical signal are closed ripple by the 2nd WDM coupling mechanism 50, are finally exported by the corresponding output port 40 of wavelength-selective switches.
Based on above-mentioned C+L band wavelength selector switch, the invention provides a kind of implementation method of C+L band wavelength selector switch, comprise the following steps:
(1) input optical signal is divided into C-band and L-band input optical signal, and exports the corresponding input optical fibre port of input-output optical fiber array respectively to;
(2) C-band exported by corresponding input optical fibre port and L-band input optical signal adjust polarization state through polarization diversity element, then after cylindrical mirror reflection and collimator lens array collimation, export grating array to successively;
(3) C-band and L-band input optical signal are pressed different wave length at space development by grating array, and reflex to spatial light modulator through collimator lens array collimation and cylindrical mirror successively again;
(4) spatial light modulator carries out amplitude and phase place adjustment to the light signal of different wave length respectively, then reflects and back light grid array after collimator lens array collimation through cylindrical mirror successively;
(5) light signal of different wave length is synthesized C-band and L-band output optical signal by grating array, then reflexes to polarization diversity element through collimator lens array collimation and cylindrical mirror successively;
(6) polarization diversity element recovers the polarization state of C-band and L-band output optical signal, and exports the appointment output optical fibre port of input-output optical fiber array to;
(7) C-band exported by output optical fibre and L-band light signal close ripple and export.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structure change made under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, all falls within protection scope of the present invention.
Claims (3)
- The processing unit of 1.C+L band wavelength selector switch, is characterized in that, comprises input-output optical fiber array, polarization diversity element, cylindrical mirror, collimator lens array, grating array and spatial light modulator able to programme,C-band and L-band input optical signal export described polarization diversity element to through the corresponding input optical fibre of described input-output optical fiber array respectively, the polarization state of described polarization diversity element adjustment C-band and L-band input optical signal, again after described cylindrical mirror reflection and described collimator lens array collimation, different wave length is pressed at space development by described grating array, the light signal of different wave length carries out the adjustment of amplitude and phase place through the respective handling unit that described collimator lens array and described cylindrical mirror reflex to described spatial light modulator, light signal after described spatial light modulator adjustment, return described grating array through described cylindrical mirror and collimator lens array again and synthesize C-band and L-band output optical signal, C-band and L-band output optical signal are after described collimator lens array focuses on, the polarization state that polarization diversity element recovers C-band and L-band output optical signal is reflexed to again by described cylindrical mirror, finally export the appointment output optical fibre port of described input-output optical fiber array respectively to,Described input-output optical fiber array is arranged by C-band optical fiber group and L-band optical fiber group two and forms side by side, often organize optical fiber group and comprise an input optical fibre and the output optical fibre equal with the output port quantity of wavelength-selective switches respectively, described C-band optical fiber group and L-band optical fiber group stagger a fiber arrangement up and down;Input optical fibre in described C-band optical fiber group is positioned at the top, and the input optical fibre in described L-band optical fiber group is positioned at bottom; Or the input optical fibre in described C-band optical fiber group is positioned at bottom, the input optical fibre in described L-band optical fiber group is positioned at the top.
- 2.C+L band wavelength selector switch, comprise: input port, multiple output port and a processing unit, it is characterized in that, described output port place is provided with a WDM coupling mechanism, output port place described in each is respectively equipped with a 2nd WDM coupling mechanism, described processing unit comprises input-output optical fiber array, polarization diversity element, cylindrical mirror, collimator lens array, grating array and spatial light modulator able to programmeThe input optical signal that input port from wavelength-selective switches inputs is divided into C-band and L-band input optical signal by the one WDM coupling mechanism, and exports the corresponding input optical fibre port of described input-output optical fiber array respectively to;The C-band exported by corresponding input optical fibre port and L-band input optical signal adjust polarization state through polarization diversity element, then after cylindrical mirror reflection and collimator lens array collimation, export grating array to successively;C-band and L-band input optical signal are pressed different wave length at space development by grating array, and reflex to spatial light modulator through collimator lens array collimation and cylindrical mirror successively again;Spatial light modulator carries out amplitude and phase place adjustment to the light signal of different wave length respectively, then reflects and back light grid array after collimator lens array collimation through cylindrical mirror successively;The light signal of different wave length is synthesized C-band and L-band output optical signal by grating array, then reflexes to polarization diversity element through collimator lens array collimation and cylindrical mirror successively;Polarization diversity element recovers the polarization state of C-band and L-band output optical signal, and exports the appointment output optical fibre port of input-output optical fiber array to;The output port of 2nd WDM coupling mechanism by the C-band exported by output optical fibre and L-band light signal conjunction ripple and through wavelength-selective switches exports;Described input-output optical fiber array is arranged by C-band optical fiber group and L-band optical fiber group two and forms side by side, often organize optical fiber group and comprise an input optical fibre and the output optical fibre equal with the output port quantity of wavelength-selective switches respectively, described C-band optical fiber group and L-band optical fiber group stagger a fiber arrangement up and down;Input optical fibre in described C-band optical fiber group is positioned at the top, and the input optical fibre in described L-band optical fiber group is positioned at bottom; Or the input optical fibre in described C-band optical fiber group is positioned at bottom, the input optical fibre in described L-band optical fiber group is positioned at the top.
- The implementation method of 3.C+L band wavelength selector switch, is characterized in that, comprise the following steps:Input optical signal is divided into C-band and L-band input optical signal, and exports the corresponding input optical fibre port of input-output optical fiber array respectively to;The C-band exported by corresponding input optical fibre port and L-band input optical signal adjust polarization state through polarization diversity element, then after cylindrical mirror reflection and collimator lens array collimation, export grating array to successively;C-band and L-band input optical signal are pressed different wave length at space development by grating array, and reflex to spatial light modulator through collimator lens array collimation and cylindrical mirror successively again;Spatial light modulator carries out amplitude and phase place adjustment to the light signal of different wave length respectively, then reflects and back light grid array after collimator lens array collimation through cylindrical mirror successively;The light signal of different wave length is synthesized C-band and L-band output optical signal by grating array, then reflexes to polarization diversity element through collimator lens array collimation and cylindrical mirror successively;Polarization diversity element recovers the polarization state of C-band and L-band output optical signal, and exports the appointment output optical fibre port of input-output optical fiber array to;The C-band export output optical fibre and L-band light signal close ripple and export;Described input-output optical fiber array is arranged by C-band optical fiber group and L-band optical fiber group two and forms side by side, often organize optical fiber group and comprise an input optical fibre and the output optical fibre equal with the output port quantity of wavelength-selective switches respectively, described C-band optical fiber group and L-band optical fiber group stagger a fiber arrangement up and down;Input optical fibre in described C-band optical fiber group is positioned at the top, and the input optical fibre in described L-band optical fiber group is positioned at bottom; Or the input optical fibre in described C-band optical fiber group is positioned at bottom, the input optical fibre in described L-band optical fiber group is positioned at the top.
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