CN103197388A - C and L waveband wavelength selecting switch, as well as implementation method and processing unit thereof - Google Patents
C and L waveband wavelength selecting switch, as well as implementation method and processing unit thereof Download PDFInfo
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Abstract
The invention discloses a C and L waveband wavelength selecting switch, as well as an implementation method and a processing unit thereof, wherein the processing unit comprises an input-output fiber array, a polarization diversity element, a cylindrical surface reflector, a collimating lens array, a grating array and a programmable spatial light modulator; and a C waveband input light signal and an L waveband input light signal enter respectively the polarization diversity element through the input-output fiber array for polarization state adjustment, are reflected by the cylindrical surface reflector, collimated by the collimating lens array, expanded by the grating array according to different wavelengths, reflected to the programmable spatial light modulator for adjustment on magnitude and phase through the collimating lens array and the cylindrical surface reflector, and then returned to the grating array to be synthesized into a C waveband output light signal and an L waveband output light signal through the cylindrical surface reflector and the collimating lens array, and the C waveband output light signal and the L waveband output light signal are output through a designated output optical fiber port after the polarization state is restored. According to the C and L waveband wavelength selecting switch, as well as the implementation method and the processing unit, only one programmable spatial light modulator is used for realizing dynamic allocation of a C waveband wavelength resource and an L waveband wavelength resource through a skillful design of a light path, the structure is simple and the system cost is greatly reduced.
Description
Technical field
The present invention relates to wavelength-selective switches, be specifically related to C+L wave band wavelength-selective switches 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 video transmission increases rapidly, requirement to transmission capacity, speed, distance and the transmission quality of optical-fiber network improves constantly, and also particularly pays close attention to dirigibility that optical-fiber network makes up and the reduction of construction and operation and maintenance cost simultaneously.
DWDM dense wavelength division multiplexing system is current modal photosphere networking technology, can realize the transfer capability of tens of wavelength even wavelength up to a hundred by multiplexing demultiplexing device, but current wavelength-division multiplex system, it still is the line system of a point-to-point in essence, and most photosphere networking can only be passed through the optical link system constructing that realize in terminal station (TM).The appearance of OADM optical add/drop multiplexer has stepped the evolution of networking from point to points to looped network gradually.But because the limited function of OADM, the optical channel of fixed number and wavelength is not up and down really realized photosphere networking flexibly usually.Therefore, in a sense, early stage wavelength-division multiplex system is not realized photosphere networking truly, is difficult to satisfy the requirement of business network IPization and packetizing, for example the professional dispatching of network, reliability, maintainability, extensibility, manageability etc.This situation just is improved up to the appearance of ROADM (Reconfigurable Optical Add-Drop Multiplexer, reconstructable OADM equipment).
ROADM is a kind of network element of the SDH of being similar to ADM photosphere, it can finish the road up and down (Add/Drop) of optical channel at a node, and other cross scheduling of the wavelength level between the break-through optical channel, realize configuration and the adjustment of road wavelength up and down by the ROADM subsystem in the software Long-distance Control network element.ROADM with dynamic-configuration ability is the important foundation that optical-fiber network " intelligence " is realized, for the construction of basic bearer network provides brand-new thinking.
ROADM usually adopts three kinds of technology: planar lightwave circuit (Planar Lightwave Circuits, PLC), wavelength blocker (Wavelength Blocker, WB) and wavelength-selective switches (Wavelength Selective Switch, WSS).Wherein, wavelength-selective switches adopts the free space optical exchange, can support that (dimension, Degree), therefore, WSS type ROADM becomes the one preferred technique of ROADM of future generation to higher port number gradually.Spatial light modulator (SLM, Spatial Light Modulator) be the technological core of WSS, implementation mainly contains: microelectromechanical systems (MEMS, Micro Electro MechanicalSystems), liquid crystal (LC, Liquid Crystal) and liquid crystal on silicon technology (LCoS, Liquid Crystal on Silicon).
At present, ROADM is (＞2 dimension) architecture evolution from simple bidimensional framework to more complicated multidimensional, and in order to satisfy the ever-increasing demand of message capacity, (1530nm～1565nm) expands to L-band (1565nm～1625nm) to the system works wave band by the original C wave band.The enhancement mode WSS that releases has further enlarged the dirigibility of WSS recently, this WSS realizes based on the programmable optical processor WaveShaper of liquid crystal on silicon technology (LCoS), but the high resolving power of acquisition, operating wavelength range can not comprise C and two wave bands of L, an equipment only is used for some specific wave bands, and it will be restricted in following broadband light network service.So it is significant for promoting following broadband light networking and ROADM networking and practical engineering application to study the C+L wave band wavelength-selective switches how implementation structure is simple and cost is relatively low.
Summary of the invention
Technical matters to be solved by this invention is to solve as problem that how simple structure and relatively low cost are realized high resolving power C+L wave band wavelength-selective switches WSS.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention provides a kind of processing unit of C+L wave band wavelength-selective switches, comprise the input-output optical fiber array, the 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, described polarization diversity element is adjusted the polarization state of C-band and L-band input optical signal, again behind described cylindrical mirror reflection and described collimator lens array collimation, press different wave length at space development by described grating array, wavelength optical signals is carried 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 is adjusted, the described cylindrical mirror of process and collimator lens array return described grating array and synthesize C-band and L-band output light signal again, C-band and L-band output light signal are after described collimator lens array focuses on, reflex to the polarization state that the polarization diversity element recovers C-band and L-band output light signal by described cylindrical mirror again, export the appointment output optical fibre port of described input-output optical fiber array at last respectively to.
In above-mentioned processing unit, described input-output optical fiber array is made of side by side C-band optical fiber group and L-band optical fiber group two row, every group of optical fiber group comprises an input optical fibre and the output optical fibre that equates with the output port quantity of wavelength-selective switches respectively, described C-band optical fiber group and the L-band optical fiber group fiber arrangement that staggers up and down.
In above-mentioned processing unit, the input optical fibre in the described C-band optical fiber group is positioned at the top, and the input optical fibre in the described L-band optical fiber group lays respectively at below; Perhaps, the input optical fibre in the described C-band optical fiber group is positioned at below, and the input optical fibre in the described L-band optical fiber group lays respectively at the top.
The present invention also provides a kind of C+L wave band wavelength-selective switches, comprise: input port, a plurality of output port and a processing unit, described output port place is provided with a WDM coupling mechanism, each described output port place is provided with the 2nd a WDM coupling mechanism respectively, 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 one WDM coupling mechanism will be divided into C-band and L-band input optical signal from the input optical signal that the input port of wavelength-selective switches is imported, and export the corresponding input optical fibre port of described input-output optical fiber array respectively to;
C-band and L-band input optical signal by corresponding input optical fibre port output are adjusted polarization state through the polarization diversity element, export grating array to successively behind cylindrical mirror reflection and collimator lens array collimation then;
Grating array is pressed different wave length at space development with C-band and L-band input optical signal, and reflexes 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 wavelength optical signals respectively, again back light grid array after cylindrical mirror reflection and collimator lens array collimate successively;
Grating array synthesizes C-band and L-band output light signal with wavelength optical signals, reflexes to the polarization diversity element through collimator lens array collimation and cylindrical mirror successively then;
The polarization diversity element recovers the polarization state of C-band and L-band output light signal, and exports the appointment output optical fibre port of input-output optical fiber array to;
The 2nd WDM coupling mechanism will close ripple and through the output port output of wavelength-selective switches by the C-band of output optical fibre output and L-band light signal.
In above-mentioned C+L wave band wavelength-selective switches, described input-output optical fiber array is made of side by side C-band optical fiber group and L-band optical fiber group two row, every group of optical fiber group comprises an input optical fibre and the output optical fibre that equates with the output port quantity of wavelength-selective switches respectively, described C-band optical fiber group and the L-band optical fiber group fiber arrangement that staggers up and down.
The present invention also provides a kind of implementation method of C+L wave band wavelength-selective switches, may further comprise the 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;
C-band and L-band input optical signal by corresponding input optical fibre port output are adjusted polarization state through the polarization diversity element, export grating array to successively behind cylindrical mirror reflection and collimator lens array collimation then;
Grating array is pressed different wave length at space development with C-band and L-band input optical signal, and reflexes 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 wavelength optical signals respectively, again back light grid array after cylindrical mirror reflection and collimator lens array collimate successively;
Grating array synthesizes C-band and L-band output light signal with wavelength optical signals, reflexes to the polarization diversity element through collimator lens array collimation and cylindrical mirror successively then;
The polarization diversity element recovers the polarization state of C-band and L-band output light signal, and exports the appointment output optical fibre port of input-output optical fiber array to;
C-band and the L-band light signal of output optical fibre output are closed ripple output.
The present invention, by the ingenious design on the light path, only with a spatial light modulator C-band and L-band input optical signal are carried out programmed process, realized the dynamic-configuration of C-band and L-band wavelength resource, do not need to use the WSS of different-waveband, do not increase the quantity of WSS yet, simple in structure, reduced system cost significantly.
Description of drawings
Fig. 1 is the structural representation of the wavelength-selective switches of C+L wave band shown in the specific embodiment of the invention (1 * 4);
Fig. 2 is the synoptic diagram of the processing unit in the C+L wave band wavelength-selective switches shown in Figure 1 (1 * 4);
Fig. 3 is the synoptic diagram of the input-output optical fiber array in the wavelength-selective switches of C+L wave band shown in the specific embodiment of the invention (1 * 4);
Fig. 4 is input and output grating array and light path synoptic diagram among the present invention;
Fig. 5 is spatial light modulator of the present invention and spectral distribution synoptic diagram.
Embodiment
C+L wave band wavelength-selective switches provided by the invention, by the ingenious design on the light path, only just realized dynamic-configuration to C-band and L-band wavelength resource with a spatial light modulator, and transfer to the output port of appointment respectively, with this specific embodiment of 1 * 4 wavelength-selective switches and in conjunction with Figure of description the present invention is made detailed explanation below.
Obviously, technical scheme provided by the invention is not limited to 1 * 4 wavelength-selective switches, and those skilled in the art fully can be as required, by the choose reasonable to respective element, namely applicable to the wavelength-selective switches of multiport more.
Fig. 1 is the structural representation of the wavelength-selective switches of C+L wave band shown in the specific embodiment of the invention (1 * 4), Fig. 2 is the synoptic diagram of the processing unit in the C+L wave band wavelength-selective switches shown in Figure 1 (1 * 4), as shown in Figure 1 and Figure 2, C+L wave band wavelength-selective switches provided by the invention comprises: input port 10, a plurality of output port 40 and a processing unit 30.Output port 10 places are provided with a WDM coupling mechanism 20, and each output port 40 place is provided with the 2nd a WDM coupling mechanism 50 respectively.
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, formed side by side by C-band optical fiber group 311 and 312 liang of row of L-band optical fiber group, C-band optical fiber group 311 comprises a C-band input optical fibre 3111 and the C-band output optical fibre 3112 that equates 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 that equates with the output port quantity of wavelength-selective switches.C-band optical fiber group 311 and L-band optical fiber group 312 are along the direction that is arranged above and below of the optical fiber fiber arrangement that staggers.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 the C-band optical fiber group 311 is the 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 the L-band input optical fibre, and what be arranged in order above is L-band output optical fibre 1～4.The C-band output optical fibre is concordant with the L-band output optical fibre, staggers in C-band input optical fibre and L-band input optical fibre position, its objective is for the upper-lower position on collimator lens array, grating array and spatial light modulator separates with C-band and L-band spectrum.
The one WDM coupling mechanism 20 will be divided into C-band and L-band input optical signal from the input optical signal that the input port 10 of wavelength-selective switches is imported, and export the corresponding input optical fibre port of input-output optical fiber array 31 respectively to, be that the C-band input optical signal exports C-band input optical fibre 3111 to, the C-band input optical signal exports L-band input optical fibre 3121 to.
C-band input optical signal and L-band input optical signal by C-band input optical fibre 3111 and 3121 outputs of L-band input optical fibre are adjusted polarization state through polarization diversity element 32, make it consistent with the maximum polarization state of the diffraction of grating array 35 respectively, be reflected into collimator lens array 34 by cylindrical mirror 33 then, behind collimator lens array 34 collimations, export grating array 35 to.
Grating array 35 carries out light splitting with C-band input optical signal and L-band input optical signal respectively, and presses different wave length at space development, and as shown in Figure 4, the first half of grating array 35 is the C-band grating, is used for the C-band light signal is carried out light splitting; The latter half of grating array 35 is the L-band grating, is used for the L-band light signal is carried out light splitting.C-band grating light path synoptic diagram is as shown in upper right dotted line block diagram, (1530～1565nm) are incident to the C-band grating surface to the C-band incident light, through the C-band optical grating diffraction, the C-band light signal is separated in the 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 incident angle θ determines.L-band grating light path synoptic diagram is as shown in the dotted line block diagram of bottom right, (1565～1625nm) are incident to the L-band grating surface to the L-band incident light, through the L-band optical grating diffraction, the L-band light signal is separated in the 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 incident angle θ determines.Collimate through collimator lens array 34 again from the wavelength optical signals of grating array 35 outputs, the spectrum component of each wavelength correspondence is assembled, and reflexed to spatial light modulator 36 by cylindrical mirror 33;
Spatial light modulator 36 can be respectively carries out flexible programming by amplitude and phase place to each optical channel of C-band and L-band, wavelength optical signals is carried out amplitude and phase place adjustment, as shown in Figure 5, take up space some processing units of photomodulator the latter half of take up space some processing units of photomodulator the first half of C-band spectrum, L-band spectrum.Quilt to spatial light modulator occupies the adjustment that the respective handling unit carries out amplitude and phase place, respectively amplitude and the phase place of each optical channel of C and L-band is carried out flexible programming, can be respectively the frequency spectrum of C and L-band be carried out filtering.Light signal after spatial light modulator 36 is handled reflects into collimator lens array 34 through cylindrical mirror 33, by collimator lens array 34 collimation back back light grid arrays 35;
Grating array 35 synthesizes C-band output light signal and the L-band output light signal with particular range of wavelengths with wavelength optical signals, and then through collimator lens array 34 collimations, reflexes to polarization diversity element 32 by cylindrical mirror 33;
Polarization diversity element 32 recovers the polarization state of C-band output light signal and L-band output light signal, exports the appointment output optical fibre port of input-output optical fiber array 31 again to;
The 2nd WDM coupling mechanism 50 will close ripple by C-band output light signal and the L-band output light signal of input-output optical fiber array 31 outputs, be exported by the corresponding output port 40 of wavelength-selective switches at last.
Based on above-mentioned C+L wave band wavelength-selective switches, the invention provides a kind of implementation method of C+L wave band wavelength-selective switches, may further comprise the 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) adjust polarization state by C-band and the L-band input optical signal of corresponding input optical fibre port output through the polarization diversity element, behind cylindrical mirror reflection and collimator lens array collimation, export grating array to successively then;
(3) grating array is pressed different wave length at space development with C-band and L-band input optical signal, and reflexes 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 wavelength optical signals respectively, again back light grid array after cylindrical mirror reflection and collimator lens array collimate successively;
(5) grating array synthesizes C-band and L-band output light signal with wavelength optical signals, reflexes to the polarization diversity element through collimator lens array collimation and cylindrical mirror successively then;
(6) the polarization diversity element recovers the polarization state of C-band and L-band output light signal, and exports the appointment output optical fibre port of input-output optical fiber array to;
(7) C-band and the L-band light signal with output optical fibre output closes ripple output.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structural change of making 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 (6)
1.C+L the processing unit of wave band wavelength-selective switches is characterized in that, comprises input-output optical fiber array, polarization diversity element, cylindrical mirror, 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, described polarization diversity element is adjusted the polarization state of C-band and L-band input optical signal, again behind described cylindrical mirror reflection and described collimator lens array collimation, press different wave length at space development by described grating array, wavelength optical signals is carried 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 is adjusted, the described cylindrical mirror of process and collimator lens array return described grating array and synthesize C-band and L-band output light signal again, C-band and L-band output light signal are after described collimator lens array focuses on, reflex to the polarization state that the polarization diversity element recovers C-band and L-band output light signal by described cylindrical mirror again, export the appointment output optical fibre port of described input-output optical fiber array at last respectively to.
2. processing unit as claimed in claim 1 is characterized in that,
Described input-output optical fiber array is made of side by side C-band optical fiber group and L-band optical fiber group two row, every group of optical fiber group comprises an input optical fibre and the output optical fibre that equates with the output port quantity of wavelength-selective switches respectively, described C-band optical fiber group and the L-band optical fiber group fiber arrangement that staggers up and down.
3. processing unit as claimed in claim 2 is characterized in that,
Input optical fibre in the described C-band optical fiber group is positioned at the top, and the input optical fibre in the described L-band optical fiber group lays respectively at below; Perhaps, the input optical fibre in the described C-band optical fiber group is positioned at below, and the input optical fibre in the described L-band optical fiber group lays respectively at the top.
4.C+L wave band wavelength-selective switches, comprise: input port, a plurality of output port and a processing unit, it is characterized in that, described output port place is provided with a WDM coupling mechanism, each described output port place is provided with the 2nd a WDM coupling mechanism respectively, 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 one WDM coupling mechanism will be divided into C-band and L-band input optical signal from the input optical signal that the input port of wavelength-selective switches is imported, and export the corresponding input optical fibre port of described input-output optical fiber array respectively to;
C-band and L-band input optical signal by corresponding input optical fibre port output are adjusted polarization state through the polarization diversity element, export grating array to successively behind cylindrical mirror reflection and collimator lens array collimation then;
Grating array is pressed different wave length at space development with C-band and L-band input optical signal, and reflexes 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 wavelength optical signals respectively, again back light grid array after cylindrical mirror reflection and collimator lens array collimate successively;
Grating array synthesizes C-band and L-band output light signal with wavelength optical signals, reflexes to the polarization diversity element through collimator lens array collimation and cylindrical mirror successively then;
The polarization diversity element recovers the polarization state of C-band and L-band output light signal, and exports the appointment output optical fibre port of input-output optical fiber array to;
The 2nd WDM coupling mechanism will close ripple and through the output port output of wavelength-selective switches by the C-band of output optical fibre output and L-band light signal.
5. C+L wave band wavelength-selective switches as claimed in claim 4 is characterized in that,
Described input-output optical fiber array is made of side by side C-band optical fiber group and L-band optical fiber group two row, every group of optical fiber group comprises an input optical fibre and the output optical fibre that equates with the output port quantity of wavelength-selective switches respectively, described C-band optical fiber group and the L-band optical fiber group fiber arrangement that staggers up and down.
6.C+L the implementation method of wave band wavelength-selective switches is characterized in that, may further comprise the 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;
C-band and L-band input optical signal by corresponding input optical fibre port output are adjusted polarization state through the polarization diversity element, export grating array to successively behind cylindrical mirror reflection and collimator lens array collimation then;
Grating array is pressed different wave length at space development with C-band and L-band input optical signal, and reflexes 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 wavelength optical signals respectively, again back light grid array after cylindrical mirror reflection and collimator lens array collimate successively;
Grating array synthesizes C-band and L-band output light signal with wavelength optical signals, reflexes to the polarization diversity element through collimator lens array collimation and cylindrical mirror successively then;
The polarization diversity element recovers the polarization state of C-band and L-band output light signal, and exports the appointment output optical fibre port of input-output optical fiber array to;
C-band and the L-band light signal of output optical fibre output are closed ripple output.
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