CN104597572A - LCOS (Liquid Crystal on Silicon) based wavelength selecting switch - Google Patents
LCOS (Liquid Crystal on Silicon) based wavelength selecting switch Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/35—Optical coupling means having switching means
- G02B6/354—Switching arrangements, i.e. number of input/output ports and interconnection types
- G02B6/3544—2D constellations, i.e. with switching elements and switched beams located in a plane
- G02B6/3546—NxM switch, i.e. a regular array of switches elements of matrix type constellation
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
Abstract
The invention provides an LCOS (Liquid Crystal on Silicon) based wavelength selecting switch, belongs to optical switching devices, and aims at solving the problem of limitation on quantity of output ports of the existing LCOS based wavelength selecting switch. The LCOS based wavelength selecting switch comprises an input single-die optical fiber, a polarization conversion assembly, a reflector, a fourier lens, a diffraction grating, a LCOS phase space optical modulator, a self-focusing collimating lens array and an output two-dimensional unit optical fiber array which are arranged on a light path. According to the LCOS based wavelength selecting switch, the LCOS phase space optical modulator is used for achieving two-dimensional deflection, so that the light beam of the output optical fiber array of the wavelength selecting switch can be converted from one dimension to two dimensions, and as a result, the quantity of the output end ports of the wavelength selecting switch can be greatly increased; compared with the existing LCOS based wavelength selecting switch, the LCOS based wavelength selecting switch has the advantage that the quantity of the end ports are increased at least K times, and also has the characteristics of being small in size, flexible to control, and convenient; therefore, the flexibility of the whole optical crossed interacted network can be improved, and the demand of the large-scale optical crossed interacted switch can be met.
Description
Technical field
The invention belongs to optical communication field, particularly optical exchanger part.
Background technology
In optical communication network, Reconfigurable Optical Add/drop Multiplexer (ROADM) is the important subsystem in wavelength-division multiplex (WDM) system network nodes.ROADM needs a considerable amount of wavelength-selective switches (WSS) to carry out light network to upstream and downstream module and the interconnective input of other nodes, output port, first the development in ROADM future needs the development of wavelength-selective switches (WSS), in order to better meet the networking requirements of Communication ray network, following wavelength-selective switches (WSS) may need more port to support the road up and down of wavelength.
Depend on the quick growth in WDM-ROADM light device market, the prediction of Infonetics mechanism was from 2012 to 2017 years, and the income speedup of WSS device may reach 20%.Therefore, optical communication technique around WSS is starting the research boom in global range, a lot of optical communication giant drops into a large amount of man power and materials and studies wavelength-selective switches (WSS) in the world, have developed much shaping commodity.The technical way realizing WSS both at home and abroad comprises MEMS (micro electro mechanical system) (MEMS) tilting mirror technology, Digital Micromirror Device (DMD) technology, liquid crystal (LC) technology and liquid crystal on silicon (LCOS) technology.2006, the people such as the Glenn Baxter of Australian Engana Pty company, first by LCOS technology introduction WSS field, became the new focus of this area research because selectable output port based on the WSS of liquid crystal on silicon (LCOS).
The existing wavelength-selective switches based on liquid crystal on silicon is based on one dimension beam deflection mostly, single 1 × N wavelength selector switch (WSS) port number based on LCOS scarcely can more than 9 port switchings, output port quantity is restricted, only can realize the wavelength selection function of 1 × 9, the demand that reconfigurable optical network is growing cannot be met.
Summary of the invention
The invention provides a kind of wavelength-selective switches based on liquid crystal on silicon, solve the existing problem be restricted based on the wavelength-selective switches output port quantity of liquid crystal on silicon.
A kind of wavelength-selective switches based on liquid crystal on silicon provided by the present invention, by the input single-mode fiber (SMF) be arranged in light path, polarization conversion assembly, catoptron, fourier lense, diffraction grating, LCOS phase spatial light modulator, self-focusing collimator lens array with export two-dimentional single-mode fiber array and form, it is characterized in that:
Incident WDM light beam is after the input of input single-mode fiber, by becoming parallel beam after input self-focusing collimation lens, linearly polarized light is become by polarization conversion assembly, fourier lense is reflexed to again through catoptron, focus on diffraction grating through fourier lense, light splitting is carried out with different angles by diffraction grating, catoptron is focused on through fourier lense, reflexed on the liquid crystal panel of LCOS phase spatial light modulator by catoptron, LCOS phase spatial light modulator carries out phase-modulation to launching spot, liquid crystal blazed grating needed for formation, realize the diffraction deflection of light beam, thus control the yawing moment of light beam,
From the diffraction deflection light beam of LCOS phase spatial light modulator outgoing, after catoptron reflection, parallel beam is become through fourier lense, again arrive diffraction grating place, the direction of the parallel light of diffraction grating is incided along with first time, again be reflected to fourier lense, again become directional light through fourier lense and arrive catoptron, polarization conversion assembly is reflexed to by catoptron, by the original polarization state of polarization conversion component recovery, the single-mode fiber output port exporting and expect in two-dimentional single-mode fiber array 80 is coupled into through self-focusing collimator lens array, realize the routing function of different wave length light beam.
Described wavelength-selective switches, is characterized in that:
Described self-focusing collimator lens array forms the self-focusing collimation lens matrix of the capable L row of K by K × L self-focusing collimation lens, and each row includes L self-focusing collimation lens, 1≤K≤385,5≤L≤1999; Be in the self-focusing collimation lens of self-focusing collimator lens array center as input self-focusing collimation lens, K × L self-focusing collimation lens is all positioned at same vertical plane;
Described output two-dimentional single-mode fiber array is the single-mode fiber matrix of the capable L row of K, wherein a line comprises L-1 root single-mode fiber, all the other each row include L root single-mode fiber, described input single-mode fiber inserts a line only comprising L-1 root single-mode fiber in the single-mode fiber matrix of the capable L row of K, make to input single-mode fiber and export the combination single-mode fiber matrix that two-dimentional single-mode fiber array forms the capable L row of K, combination single-mode fiber matrix arrangement mode is identical with described self-focusing collimator lens array, each self-focusing collimation lens one_to_one corresponding wherein in each single-mode fiber and self-focusing collimator lens array, described input single-mode fiber is corresponding with described input self-focusing collimation lens, each single-mode fiber and described input singlemode fiber port are all arranged in the same vertical focal plane of the self-focusing collimation lens of self-focusing collimator lens array.
Described K, L satisfy condition:
K × D≤2Ftan (arcsin (λ/d)), and K/L≤tan (arcsin (λ/d)),
Wherein, D is the diameter exporting each single-mode fiber fibre core in two-dimentional single-mode fiber array, and F is fourier lense focal length, and λ is incident wavelength, and d is LCOS liquid crystal phase bit space light modulator pixel size;
Described self-focusing collimator lens array center is capable Y the self-focusing collimation lens of its X,
When K is odd number, X=(K+1)/2, when K is even number, X=K/2 or K/2+1;
When L is odd number, Y=(L+1)/2, when L is even number, Y=L/2 or L/2+1.
Described polarization conversion assembly is made up of the first calcite prism, the second calcite prism and the first half-wave plate, the second half-wave plate, input light is divided into the vertical two-way light of polarization state by the first calcite prism, wherein the second calcite prism is delivered to by the first half-wave plate 90-degree rotation in a road, the second calcite prism is delivered to by the second half-wave plate 90-degree rotation in another road, and two-way is all become a branch of linearly polarized light of unified polarization direction by the second calcite prism.
Described LCOS phase spatial light modulator is made up of liquid crystal panel and driving circuit, when light beam focuses on the optional position of liquid crystal panel, its hot spot covers multiple liquid crystal pixel, voltage is applied to pixel electrode by liquid crystal display drive circuit, the refractive index of liquid crystal corresponding to each electrode is changed, thus phase place is changed, required blazed grating is formed within the scope of one that comprises hot spot region, make incident light carry out one-level wavelength by the direction of specifying to glitter, thus reach the object of beam deflection.The angle being incided diffraction grating by the diffracted beam of LCOS Polarization Control can be controlled, can by loading different voltage to realize to the LCOS pixel under hot spot covering.
The present invention with liquid crystal on silicon (LCOS) phase spatial light modulator (SLM) for core, LCOS phase spatial light modulator is utilized to realize two-dimensional deflection to needing the light beam exchanged, the light beam of wavelength-selective switches (WSS) output optical fibre array is transformed to two dimension by one dimension, the quantity of wavelength-selective switches output port can be increased considerably, compared with the existing wavelength-selective switches based on LCOS (WSS) structure, port number at least can increase K doubly, and it is little to have volume, control flexibly, feature easily, thus the dirigibility of whole optical cross connection (OXC) network can be improved, the demand of extensive optical cross connection network can be met.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
The self-focusing collimator lens array that Fig. 2 (A) is the embodiment of the present invention 1 and the two-dimentional single-mode fiber array position schematic diagram of output;
The combination single-mode fiber matrix schematic diagram that Fig. 2 (B) is the embodiment of the present invention 2;
Light path schematic diagram when Fig. 3 is collimation lens functions;
Fig. 4 is polarization conversion assembly schematic diagram;
Light path schematic diagram when Fig. 5 is fourier lense work;
Fig. 6 (A), Fig. 6 (B) are diffraction grating working method schematic diagram;
Fig. 7 is two-dimentional liquid crystal pixel structure and working method;
When Fig. 8 is M=4, LCOS Phase Equivalent schematic diagram;
Fig. 9 is that LCOS is for WSS routing principle schematic;
Figure 10 is the equivalent phase schematic diagram after LCOS on-load voltage;
Figure 11 is the beam distribution schematic diagram that second time incides on diffraction grating.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
As shown in Figure 1, the present invention is by the input single-mode fiber 10 (SMF) be arranged in light path, polarization conversion assembly 20, catoptron 30, fourier lense 40, diffraction grating 50, LCOS phase spatial light modulator 60, self-focusing collimator lens array 70 with export two-dimentional single-mode fiber array 80 and form:
Incident WDM light beam is after input single-mode fiber 10 inputs, by becoming parallel beam after input self-focusing collimation lens, linearly polarized light is become by polarization conversion assembly 20, fourier lense 40 is reflexed to again through catoptron 30, focus on diffraction grating 50 through fourier lense 40, light splitting is carried out with different angles by diffraction grating 50, catoptron 30 is focused on through fourier lense 40, reflexed on the liquid crystal panel of LCOS phase spatial light modulator 60 by catoptron 30, LCOS phase spatial light modulator 60 pairs of launching spots carry out phase-modulation, liquid crystal blazed grating needed for formation, realize the diffraction deflection of light beam, thus control the yawing moment of light beam,
From the diffraction deflection light beam of LCOS phase spatial light modulator 60 outgoing, after catoptron 30 reflects, parallel beam is become through fourier lense 40, again arrive diffraction grating 50 place, the direction of the parallel light of diffraction grating is incided along with first time, again be reflected to fourier lense 40, again become directional light through fourier lense and arrive catoptron 30, polarization conversion assembly 20 is reflexed to by catoptron 30, original polarization state is recovered by polarization conversion assembly 20, the single-mode fiber output port exporting and expect in two-dimentional single-mode fiber array 80 is coupled into through self-focusing collimator lens array 70, realize the routing function of different wave length light beam.
As shown in Fig. 2 (A), embodiments of the invention 1, described self-focusing collimator lens array 70 forms the self-focusing collimation lens matrix of 7 row 9 row by 7 × 9 self-focusing collimation lenses, each row includes 9 self-focusing collimation lenses, be in self-focusing collimator lens array center i.e. the 4th row the 5th self-focusing collimation lens and be all positioned at same vertical plane as input self-focusing collimation lens 71,7 × 9 self-focusing collimation lenses;
Embodiments of the invention 2, self-focusing collimator lens array 70 forms the self-focusing collimation lens matrix of 8 row 8 row by 8 × 8 self-focusing collimation lenses, as shown in Fig. 2 (B), the two-dimentional single-mode fiber array 80 of described output is the single-mode fiber matrix that 8 row 8 arrange, wherein a line comprises 7 single-mode fibers, all the other each row include 8 single-mode fibers, described input single-mode fiber 10 inserts a line only comprising 7 single-mode fibers in the single-mode fiber matrix of 8 row 8 row, make to input single-mode fiber 10 and export the combination single-mode fiber matrix that two-dimentional single-mode fiber array 80 forms 8 row 8 row, combination single-mode fiber matrix arrangement mode is identical with described self-focusing collimator lens array 70, each self-focusing collimation lens one_to_one corresponding wherein in each single-mode fiber and self-focusing collimator lens array 70, to input self-focusing collimation lens 71 corresponding with being in self-focusing collimator lens array center i.e. the 5th row the 4th for described input single-mode fiber 10, each single-mode fiber and described input single-mode fiber 10 port are all arranged in the same vertical focal plane of the self-focusing collimation lens of self-focusing collimator lens array.
As shown in Figure 3, self-focusing collimation lens 71 is mainly used in the light beam from input end single-mode fiber 10 outgoing to become parallel beam, ensures that WDM light beam is parallel and incides reflection-type diffraction grating.
Liquid crystal molecule has two refractive indexes, is called dielectric anisotropy, and is called birefringence at optical field at electricity field.The vibration of polarized light only in a direction, namely only on a plane of polarization.A kind ofly have in the medium of slow axis and fast axis if be injected into by this plane of polarization, this plane of polarization will rotate.Described in upper, LCOS phase spatial light modulator has requirement to polarisation of light state, if do not add polarization conversion system, then the polarization state in optical transmission system is unknown and uncontrollable.Therefore, need to add polarization conversion assembly in the optical path, object is that the WDM light beam of incidence is become linearly polarized light.
As shown in Figure 4, described polarization conversion assembly 20 is made up of the first calcite prism 21, second calcite prism 22 and the first half-wave plate 23, second half-wave plate 24, input light is divided into the vertical two-way light of polarization state by the first calcite prism 21, wherein the second calcite prism 22 is delivered to by the first half-wave plate 23 90-degree rotation in a road, the second calcite prism 22 is delivered to by the second half-wave plate 24 90-degree rotation in another road, and two-way is all become a branch of linearly polarized light of unified polarization direction by the second calcite prism 22; This structure makes the loss of luminous power also can be less.
As shown in Figure 5, light beam parallel arbitrarily, by after fourier lense 40, can be focused onto the focal plane of fourier lense 40.In the present invention, incident WDM light beam can become parallel beam by input end collimation lens 71, means that the incident angle that the light beam of each wavelength in WDM light beam incides diffraction grating 50 is identical.Parallel WDM light beam is by after diffraction grating 50, and the beam diffraction exit direction of different wave length can be different, the diverse location place above the liquid crystal panel 61 that the light beam of different wave length can be converged to LCOS phase spatial light modulator 60 by fourier lense 40.
As shown in Fig. 6 (A), after parallel WDM light beam incides reflection-type diffraction grating 50, the light beam of different Single wavelength along different diffraction direction outgoing, can so just achieve the demodulation of incident WDM light beam.As shown in Fig. 6 (B), incide above reflection-type diffraction grating by the light beam of the different wave length of LCOS Polarization Control, can along identical angle outgoing after diffraction.
The diffraction grating 50 of the present embodiment adopts reflection-type diffraction grating, and reflection-type is identical with the principle of transmissive diffraction grating, therefore, only introduces reflection-type diffraction grating here.Reflection-type diffraction grating incident beam and diffracted beam are in the same side in grating face, and incident beam is through reflection-type diffraction grating, and the light of different frequency composition is with different angle diffraction.Theoretical according to fraunhofer, a branch of directional light vertically incides on plane reflection grating, propagates after each seam diffraction to all directions.Angle of diffraction is applicable to following condition:
dsinθ＝mλ,m＝0、1、2......；
Wherein m is the order of diffraction time, and λ is wavelength, and θ is angle of diffraction, and d is grating constant.
As shown in Figure 7, described LCOS phase spatial light modulator 60 is made up of liquid crystal panel 61 and driving circuit 62, when light beam focuses on the optional position of LCOS panel, its hot spot covers multiple liquid crystal pixel, voltage is applied to pixel electrode by liquid crystal display drive circuit, the refractive index of liquid crystal corresponding to each electrode is changed, thus phase place is changed, required blazed grating is formed within the scope of one that comprises hot spot region, make incident light carry out one-level wavelength by the direction of specifying to glitter, thus reach the object of beam deflection.After LCOS on-load voltage, phase place change formula is:
Wherein
for phase place, c is the light velocity, and l is thickness of liquid crystal, and λ is wavelength, and Δ n is liquid crystal ordinary light and unusual anaclasis rate variance.
LCOS panel is the liquid crystal pixel distribution of two dimension, and two-dimentional liquid crystal pixel distribution as shown in Figure 7.For easy analysis, the angular deflection principle (only the PHASE DISTRIBUTION of one dimension need be rotated the angle of specifying) on one dimension (X-axis) direction is only described, similar along Y direction.Following formula is depended in discrete angular deflection:
β
max＝sin
-1(λ/Md)；
Wherein M is phase level time, and d is the size of a pixel, and λ is optical wavelength.Discrete electrode is had under each liquid crystal pixel of LCOS, and each electrode can be controlled individually, by applying voltage on electrode, just can realize the phase-modulation of each pixel, when phase shift reaches 2 π, phase place is resetted, so just can with 0 to 2 π for one-period form the phased array that has periodic phase distribution, the binary raster of its similar in optics, is referred to as " liquid crystal grating ".When light incides " liquid crystal grating ", will diffraction be there is, and by control phase level time M, angle of diffraction can be controlled, realize the angular deflection of specifying.During M=4, as shown in Figure 8, wherein β is angle of diffraction to LCOS isoboles, and α is incident angle, and d is the size of a pixel.
In the deflection of periodicity blazed grating discrete angular, the diffraction efficiency of one-level blaze wavelength is:
Wherein M is phase level time, I
0input and output luminous power is respectively with I.
In the continuous angular deflection of periodicity blazed grating, the diffraction efficiency of one-level blaze wavelength is:
Wherein Δ α is phase delay.
Described driving circuit 62, for the adjacent phase difference Δ α specified, the notional phase delay of each liquid crystal pixel of LCOS is
Wherein n=1.2.3 ..., represent the sequence number of LCOS top electrode, φ
nrepresent the phase place that the n-th electrode pair is answered, because liquid crystal pixel has certain thickness, can not by way of very large phase delay, so need above formula to be carried out mould 2 π process, namely for the deflection angle θ specified, the phase place that each electrode loads is:
In order to reduce the complicacy of the design of LCOS hardware circuit, find more simple electrode addressing, method for designing is as follows:
Due to φ
ncarry out mod (2 π) process, so φ '
ncan in periodically change, will be attributed to 0 eventually at some motor phases, assumption period is N, is then the addressing cycle carrying out repetition with N, forms aperiodicity liquid crystal blazed grating, greatly simplifies the complexity of electrode addressing.Such as: if the result of Δ α=0.6 π, mod (2 π) makes the PHASE DISTRIBUTION of liquid crystal pixel in horizontal direction as shown in the table,
| n | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| φ n | 0 | 0.6 | 1.2 | 1.8 | 2.4 | 3.0 | 3.6 | 4.2 | 4.8 | 5.4 | 6.0 |
| φ' n | 0 | 0.6 | 1.2 | 1.8 | 0.4 | 1.0 | 1.6 | 0.2 | 0.8 | 1.4 | 0 |
Mod2 π's as a result, electrode addressing simplifies greatly can be found out from the graph, only need with 10 electrodes for benchmark, then with 10 for the cycle carries out repetitive addressing.
As shown in Figure 9, namely LCOS is used for WSS phase change routing principle schematic, the light of wherein dissimilar represented by dotted arrows different wave length, solid line representative input WDM light beam.WDM light beam is inputted by input single-mode fiber 10, becomes parallel beam, incide above LCOS liquid crystal panel 61 after self-focusing collimation lens collimation.Voltage is applied to pixel electrode by liquid crystal display drive circuit 62, the refractive index of liquid crystal corresponding to each electrode is changed, thus phase place is changed, equivalent phase figure after LCOS on-load voltage as shown in Figure 10, the wherein electrode of 63 expression silica-based liquid crystal panels, 64 represent at the bottom of the silicon of silica-based liquid crystal panels, 65 phase ramps representing Formation of liquid crystals in silica-based liquid crystal panel after LCOS on-load voltages.Within the scope of one that comprises hot spot region, form required blazed grating, thus reach the object regulating diffracted beam shooting angle, to realize carrying out routing to different wave length.
As shown in figure 11, namely light beam secondary incides the key diagram of reflection-type diffraction grating 50.Light beam 1 represents that first time incides the WDM light beam of diffraction grating, light beam 2 represents after LCOS deflects control in X direction, Single wavelength light beam is incident to above diffraction grating, and light beam 3 represents that Single wavelength light beam is incident to above diffraction grating after LCOS controls along Y-direction deflection.
Claims (5)
1. the wavelength-selective switches based on liquid crystal on silicon, be made up of the input single-mode fiber (10) be arranged in light path, polarization conversion assembly (20), catoptron (30), fourier lense (40), diffraction grating (50), LCOS phase spatial light modulator (60), self-focusing collimator lens array (70) and the two-dimentional single-mode fiber array (80) of output, it is characterized in that:
Incident WDM light beam is after input single-mode fiber (10) input, by becoming parallel beam after input self-focusing collimation lens, linearly polarized light is become by polarization conversion assembly (20), fourier lense (40) is reflexed to again through catoptron (30), focus on diffraction grating (50) through fourier lense (40), light splitting is carried out with different angles by diffraction grating (50), catoptron (30) is focused on through fourier lense (40), reflex on the liquid crystal panel of LCOS phase spatial light modulator (60) by catoptron (30), LCOS phase spatial light modulator (60) carries out phase-modulation to launching spot, liquid crystal blazed grating needed for formation, realize the diffraction deflection of light beam, thus control the yawing moment of light beam,
From the diffraction deflection light beam of LCOS phase spatial light modulator (60) outgoing, after catoptron (30) reflection, parallel beam is become through fourier lense (40), again arrive diffraction grating (50) place, the direction of the parallel light of diffraction grating is incided along with first time, again be reflected to fourier lense (40), again become directional light through fourier lense and arrive catoptron (30), polarization conversion assembly (20) is reflexed to by catoptron (30), original polarization state is recovered by polarization conversion assembly (20), the single-mode fiber output port exporting and expect in two-dimentional single-mode fiber array (80) is coupled into through self-focusing collimator lens array (70), realize the routing function of different wave length light beam.
2. wavelength-selective switches as claimed in claim 1, is characterized in that:
Described self-focusing collimator lens array (70) forms the self-focusing collimation lens matrix of the capable L row of K by K × L self-focusing collimation lens, and each row includes L self-focusing collimation lens, 1≤K≤385,5≤L≤1999; Be in the self-focusing collimation lens of self-focusing collimator lens array center as input self-focusing collimation lens (71), K × L self-focusing collimation lens is all positioned at same vertical plane;
Described output two-dimentional single-mode fiber array (80) is the single-mode fiber matrix of the capable L row of K, wherein a line comprises L-1 root single-mode fiber, all the other each row include L root single-mode fiber, described input single-mode fiber (10) inserts a line only comprising L-1 root single-mode fiber in the single-mode fiber matrix of the capable L row of K, make to input single-mode fiber (10) and export the combination single-mode fiber matrix that two-dimentional single-mode fiber array (80) forms the capable L row of K, combination single-mode fiber matrix arrangement mode is identical with described self-focusing collimator lens array (70), each self-focusing collimation lens one_to_one corresponding wherein in each single-mode fiber and self-focusing collimator lens array (70), described input single-mode fiber (10) is corresponding with described input self-focusing collimation lens (71), each single-mode fiber and described input single-mode fiber (10) port are all arranged in the same vertical focal plane of the self-focusing collimation lens of self-focusing collimator lens array.
3. wavelength-selective switches as claimed in claim 2, is characterized in that:
Described K, L satisfy condition:
K × D≤2Ftan (arcsin (λ/d)), and K/L≤tan (arcsin (λ/d)),
Wherein, D is the diameter exporting each single-mode fiber fibre core in two-dimentional single-mode fiber array, and F is fourier lense focal length, and λ is incident wavelength, and d is LCOS liquid crystal phase bit space light modulator pixel size;
Described self-focusing collimator lens array center is capable Y the self-focusing collimation lens of its X,
When K is odd number, X=(K+1)/2, when K is even number, X=K/2 or K/2+1;
When L is odd number, Y=(L+1)/2, when L is even number, Y=L/2 or L/2+1.
4. the wavelength-selective switches as described in claim 1,2 or 3, is characterized in that:
Described polarization conversion assembly (20) is by the first calcite prism (21), second calcite prism (22) and the first half-wave plate (23), second half-wave plate (24) forms, input light is divided into the vertical two-way light of polarization state by the first calcite prism (21), wherein the second calcite prism (22) is delivered to by the first half-wave plate (23) 90-degree rotation in a road, the second calcite prism (22) is delivered to by the second half-wave plate (24) 90-degree rotation in another road, two-way is all become a branch of linearly polarized light of unified polarization direction by the second calcite prism (22).
5. wavelength-selective switches as claimed in claim 4, is characterized in that:
Described LCOS phase spatial light modulator (60) is made up of liquid crystal panel (61) and driving circuit (62), when light beam focuses on the optional position of liquid crystal panel (61), its hot spot covers multiple liquid crystal pixel, voltage is applied to pixel electrode by liquid crystal display drive circuit (62), the refractive index of liquid crystal corresponding to each electrode is changed, thus phase place is changed, required blazed grating is formed within the scope of one that comprises hot spot region, make incident light carry out one-level wavelength by the direction of specifying to glitter, thus reach the object of beam deflection.
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN105827331A (en) * | 2016-03-11 | 2016-08-03 | 上海鼎频通信技术有限公司 | Orthogonal dual-polarization phase-shift keying modulation method and equipment based on orthogonal dual-polarization phase-shift keying modulation |
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