CN104730644A - M*N port ROADM based on composite silicon-based liquid crystal and control method thereof - Google Patents
M*N port ROADM based on composite silicon-based liquid crystal and control method thereof Download PDFInfo
- Publication number
- CN104730644A CN104730644A CN201510148337.1A CN201510148337A CN104730644A CN 104730644 A CN104730644 A CN 104730644A CN 201510148337 A CN201510148337 A CN 201510148337A CN 104730644 A CN104730644 A CN 104730644A
- Authority
- CN
- China
- Prior art keywords
- liquid crystal
- port
- silicon chip
- optical
- different
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- G02B6/29305—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 as bulk element, i.e. free space arrangement external to a light guide
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses an M*N port ROADM based on a composite silicon-based liquid crystal and a control method thereof. An M*N port reconfigurable optical add-drop multiplexer comprises an optical fiber collimator array which is formed by arranging M+N optical fiber collimators, a first Fourier transform optical lens, a volume grating, a second Fourier transform optical lens, a first silicon-based liquid crystal chip LCoS, a reflector, a second LCoS, and a thrid LCoS; the third LCoS generates +-1 order diffraction at the same time of conducting first azimuth coding, and the second LCoS and the third LCoS conduct second azimuth coding to achieve low loss interconnection of any wavelength path optical signals from any input port to any output port. According to the M*N port ROADM based on the composite silicon-based liquid crystal and the control method thereof, a non-blocking optical cross connection function of M*N ports can be achieved, the M*N port ROADM based on the composite silicon-based liquid crystal and the control method thereof have the advantages of being simple in structure, easy to achieve, and adjustable in pass-band performance; a flexible spectrum is supported, remote software control can be conducted, and the M*N port ROADM can be individually used as a node of an intelligent wavelength switched optical network.
Description
Technical field
The present invention relates to optical add/drop multiplexer, particularly relate to a kind of M × N port Reconfigurable Optical Add/drop Multiplexer based on compound liquid crystal on silicon and control method thereof.
Background technology
Long-distance Control can be carried out with software and there is high port number M × N port Reconfigurable Optical Add/drop Multiplexer ROADM of multiple input and output port and multidimensional light network OXC equipment is the key core component building intelligent software definition reconfigurable optical network, there is extremely important application prospect and international market value, receive the extensive concern of each main optical communication research institution and device and equipment supplier in international coverage.In recent years, about achievement in research and disclosed art solutions quantity are in sharply ascendant trend, associated core technical scheme also experienced by rapid development from the first generation ROADM based on wavelength blocker WB, the second generation ROADM to the third generation ROADM based on 1 × N port wavelength-selective switches WSS based on array waveguide grating AWG and optical switch matrix and development.The first generation and second generation ROADM technology, owing to there is many wretched insufficiencies in spectrum dirigibility, process complexity and job stability, are abandoned at present substantially
At present, the mainstream technology of multidimensional OXC equipment mainly adopts by the third generation ROADM technology of the combination of devices such as a large amount of 1 × N wavelength selector switch and Erbium-Doped Fiber Amplifier (EDFA) (EDFA), optical splitter.Wherein comparatively typical patented technology has: United States Patent (USP) " Growable Multi-Degree the ROADM " (patent No.: US20100124391A1 that the people such as M.D.Feuer apply for, publication date: on May 20th, 2010), United States Patent (USP) " Method forDynamic Wavelength Add/Drop in a ROADM the Network " (patent No.: US20100142961A1 that P.Wisseman applies for, publication date: on June 10th, 2010) and " Method for Expanding Cross-Connect Capacity in a ROADM OpticalNetwork " (patent No.: US20110076016A1, publication date: on March 31st, 2011), United States Patent (USP) " Scalable Optical Switches and Switching the Modules " (patent No.: US20130108215A1 that Neophotonics company of the U.S. applies for, publication date: on May 2nd, 2013), difference is the difference of connected mode.Owing to using the serial connection of WSS and optical splitter in a large number, these technical schemes generally have many wretched insufficiencies such as insertion loss is large, structure and control system complexity, failure rate is high, pass-band performance is limited.
In recent years, a lot of research institution both domestic and external has all actively developed the research of integrated M × N port ROADM equipment of new generation.Keio university of Japan adopts two MEMS Opto-VLSI chips to succeed in developing the clog-free integrated ROADM equipment with 5 × 5 ports, Finisar company have developed 2 × 4 port integration ROADM based on LCoS chip, Santec company reports the ROADM with 4 × 4 port numbers combined based on 12 × 12 port wavelength blocker WB and 8,1 × 4 photo-coupler of LCoS chip by development, Alcatel-Lucent Bell Laboratory have developed based on LCoS chip, 5 × 5 port integration ROADM of 15 kinds of connected modes can be realized, Edith Cowan university of Australia reports the clog-free ROADM of 2 × 4 port based on the development of LCoS chip, Huawei Company reported the clog-free ROADM of 8 × 8 port with two pieces of LCoS chip developments in 2014.The forth generation ROADM that wherein Huawei Company develops has most significant end mouth number reported up to now, but its internal optics design class is like the series connection of two 1 × 8WSS, thus two covers almost identical optical system is contained, the optical component count causing whole system to adopt is more, and system composition is comparatively complicated.Therefore, design and develop structure and control technology is simple, the high port number forth generation ROADM equipment of spectral characteristic integrated M × N port that adjustable, insertion loss is little flexibly becomes a hot subject of current optical communication field.
Summary of the invention
For the above-mentioned problems in the prior art, the present invention proposes a kind of Reconfigurable Optical Add/drop Multiplexer, particularly by liquid crystal on silicon chip LCoS, light beam is carried out to M × N port Reconfigurable Optical Add/drop Multiplexer of second order directional; There are more than 10 × 30 ports, support more than 32 adjustable, compatible multiple different rates of wavelength channel, channel bandwidth and channel spacing and the DWDM signal of channel spacing, any wavelength that can carry out remote software control, any direction and clog-free ROADM.
One object of the present invention is to provide a kind of M × N port Reconfigurable Optical Add/drop Multiplexer based on compound liquid crystal on silicon.
M × N port Reconfigurable Optical Add/drop Multiplexer of the present invention comprises: the optical fibre collimator array arranged by M+N optical fiber collimator, the first Fourier transform optical lens, body grating, the second Fourier transform optical lens, the first liquid crystal on silicon chip, catoptron, the second liquid crystal on silicon chip and the 3rd liquid crystal on silicon chip; Wherein, from the one or more input continuous light signals in the input port of the M optical fibre collimator array; Body grating is converged to by the first Fourier transform optical lens; The different wave length passage light signal dispersion in the horizontal direction that different input port inputs by body grating launches; Through the second Fourier transform optical lens meeting coalescence after catoptron reflection, from the light signal parallel radiation of different input ports on the different position of the 3rd liquid crystal on silicon chip, and different wave length passage forms dispersion bar in zones of different in respective position, by loading different phase hologram gratings on the corresponding region of the 3rd liquid crystal on silicon chip, produce+1 grade and-1 order diffraction, and the wavelength channel diffraction light dropping on this region is deflected along preset direction; + 1 order diffraction light and-1 order diffraction light are respectively through the first liquid crystal on silicon chip and the second liquid crystal on silicon chip, by loading and the identical phase hologram grating of the 3rd liquid crystal on silicon chip on corresponding region, the different wave length passage light signal of different input port is arrived successively after the second optical lens, body grating and the first optical lens, and appointed output terminal on optical fibre collimator array is salty newly becomes collimated light, thus realizes assigning the low-loss from any wavelength channels of any input port to any output port.
Optical fibre collimator array of the present invention is made up of M+N optical fibre collimator array of one dimensional arrangement, and wherein, M port in optical fibre collimator array is input port, the input port of M one dimensional arrangement be centrally located on optical axis; Remaining N number of port is light network output port, and the output port of N number of one dimensional arrangement lays respectively at the both sides one-tenth symmetric offset spread of M input port.Also be local drop Voice Channel output port after input port arranges circulator simultaneously, from the light signal of an input port input, after catoptron reflection, return again this input port and export through circulator, thus as wavelength blocker.The outstanding advantages of one dimension array of ports is adopted to be easy to prepare and be easy to the filter with low insertion loss light network that realizes between port.
The present invention is positioned at same plane by two pieces of LCoS (the first liquid crystal on silicon chip and the second liquid crystal on silicon chip) and catoptron, composition composite space photomodulator.Its effect is overcoming LCoS integrated scale finite sum port carrying capacity deficiency while, light signal from input port is reflexed to the 3rd liquid crystal on silicon chip, and second time orientation adjustment is carried out to the light beam completing first time azimuth coding on the 3rd liquid crystal on silicon chip, to realize any wavelength channel light signal from any input port to the low loss interconnection of any output port.
The present invention forms 4f optical information processing system by the first Fourier transform optical lens and the second Fourier transform optical lens, different input port array is imaged onto after catoptron the diverse location on the 3rd liquid crystal on silicon chip y direction, the back light signal after direction is assigned is collimated to corresponding output port simultaneously.Optical fibre collimator array is positioned at the focus place of the side of the first Fourier transform optical lens; Body grating is positioned at the focus place of the opposite side of the first Fourier transform optical lens; Body grating is positioned at the focus place of the side of the second Fourier transform optical lens; Be positioned in the focus of the opposite side of the second Fourier transform optical lens through catoptron the 3rd liquid crystal on silicon chip.
Picture from each input port is launched into corresponding rectangle dispersion collection of illustrative plates by wavelength in the x-direction by the effect of dispersion of the present invention's high density delineation body grating on the position corresponding to the respective input port of the 3rd liquid crystal on silicon chip, make different wave length passage light signal demultiplexing from different input port to the zones of different on the 3rd liquid crystal on silicon chip, complete the multiplexing function to each wavelength channel light signal on the x direction returned after assigning through direction simultaneously.Transmission-type phase hologram grating is adopted to have the remarkable advantages such as polarization is irrelevant, insertion loss significantly reduces.And the zones of different corresponding to the respective input port of the 3rd liquid crystal on silicon chip loads phase hologram grating, produce+1 grade and-1 order diffraction ,+1 order diffraction light is through the first liquid crystal on silicon chip, and-1 order diffraction light is through the second liquid crystal on silicon chip simultaneously; And make the wavelength channel diffraction light dropping on this region along the deflection of preset direction, realize again pointing to the different wave length passage light signal of different input port.
Another object of the present invention is the control method providing a kind of M × N port Reconfigurable Optical Add/drop Multiplexer based on compound liquid crystal on silicon.
The control method of M × N port Reconfigurable Optical Add/drop Multiplexer of the present invention, comprises the following steps:
1) from the one or more input continuous light signals in the input port of the M optical fibre collimator array;
2) body grating is converged to by the first Fourier transform optical lens;
3) the different wave length passage light signal dispersion in the horizontal direction that different input port inputs by body grating launches;
4) coalescence is understood after catoptron reflection through the second Fourier transform optical lens, from the light signal parallel radiation of different input ports on the different position of the 3rd liquid crystal on silicon chip, and different wave length passage forms dispersion bar in zones of different in respective position, by loading different phase hologram gratings on the corresponding region of the 3rd liquid crystal on silicon chip, produce+1 grade and-1 order diffraction, and realize the sensing again of the different wave length passage light signal of different input port;
5)+1 order diffraction light and-1 order diffraction light are respectively through the first liquid crystal on silicon chip and the second liquid crystal on silicon chip, by loading and the identical phase hologram grating of the 3rd liquid crystal on silicon chip on corresponding region, the different wave length passage light signal of different input port is arrived successively after the second optical lens, body grating and the first optical lens, and appointed output terminal on optical fibre collimator array is salty newly becomes collimated light, thus realizes assigning the low-loss from any wavelength channels of any input port to any output port.
The present invention loads to the corresponding region on the 3rd liquid crystal on silicon chip of the different wave length passage light signal from each input port the first time azimuth coding (angle of diffraction is different) that different spaces periodic phase holographic grating realizes right+1 grade (to the first liquid crystal on silicon chip) or-1 grade of (to the second liquid crystal on silicon chip) diffraction light in the y-direction, realizes the sensing again of the different wave length passage light signal of different input port.The cycle of phase hologram grating is different, and angle of diffraction is different; By changing the periodic adjustment angle of diffraction of phase hologram grating.On the first liquid crystal on silicon chip and the second liquid crystal on silicon chip, all light beams can be made to revert to the parallel beam propagated along-z direction to identical phase hologram grating on loading on the region shared by the light beam from the 3rd liquid crystal on silicon chip and the 3rd liquid crystal on silicon chip respective regions simultaneously, complete the second time orientation adjustment of light beam.This design can make the software control system of the computing of phase hologram grating and loading procedure and complete machine greatly simplify, thus the response time established the link is shortened.
Reconfigurable Optical Add/drop Multiplexer of the present invention can realize the clog-free light network function of M × N port, have structure simple, be easy to realize, pass-band performance is adjustable, support flexible spectrum, can carry out remote software control, can separately as the feature such as node use of intelligent wavelength switched optical network.
Advantage of the present invention:
(1) present invention achieves the ROADM of the M × N port based on liquid crystal on silicon chip, adopt the method loading the phase hologram grating of different two-dimensional orientation at liquid crystal on silicon chip, by changing the cycle of grating and the orientation modulated beam of light phase place of grating, realize optics large scale integrated chip (LSI chip) to the two-dimensional directional of incident wavelength passage efficient, assign flexibly;
(2) the present invention proposes and form with two pieces of LCoS chips and one piece of catoptron composite space photomodulator to carry out secondary optics sensing technical scheme to light beam, when the light beam space of LCoS chip assigns ability very limited, take full advantage of the feature that LCoS has identical sensing ability and diffraction efficiency on+1 grade with-1 grade of both direction, not only achieve being multiplied of device port number, and make whole optical system compacter, also overall package and the adjustment of light path is easier to, and the various technical schemes reported so far all only make use of the first-order diffraction light of LCoS in its normal side, cause the waste to this very not enough LCoS beam-pointing ability,
(3) while solution LCoS chip port carrying capacity deficiency, adopt the 4f Optical System Design of novelty, develop the above integration apparatus of 10 × 30 port that the wavelength that general structure is succinct, component technology is ripe, stable and reliable for performance is irrelevant, direction is irrelevant, clog-free, support flexible spectrum (Flexible Grid), can carry out remote software control;
(4) the present invention is compared with current existing integrated M × N port ROADM technical scheme in the world, above-mentioned design not only can make the optical fibre collimator array number of equipment be increased dramatically, and has that optical system and control system are simple, critical component is easy to advantages such as prepare, facility is assembled and adjusted to light path, performance is more reliable and more stable.
Accompanying drawing explanation
Fig. 1 is the index path of M × N port Reconfigurable Optical Add/drop Multiplexer of the present invention;
Fig. 2 is the functional block diagram of the ROADM device port of one embodiment of the present of invention, and wherein, (a), as 10 × 30 port ROADM, (b) is as 30 × 10 port ROADM;
Fig. 3 is azimuth coding for light path design and Beam Control and optimization and space optical interconnect subsystem schematic diagram;
Fig. 4 is the schematic diagram of the echelon grating coding of the liquid crystal on silicon chip that the present invention uses, and wherein, (a) is the diffractogram of grating encoding figure, (b) grating encoding.
Embodiment
Below in conjunction with accompanying drawing, by embodiment, set forth the present invention further.
As shown in Figure 1, in the present embodiment, M=10, N=20, input port arranges circulator, input port is simultaneously as local drop Voice Channel output port, form the Reconfigurable Optical Add/drop Multiplexer of 10 × (20+10) ports, M × N port Reconfigurable Optical Add/drop Multiplexer comprises: optical fibre collimator array 1, the first Fourier transform optical lens 2 arranged by M+N optical fiber collimator, body grating 3, second Fourier transform optical lens 4, first liquid crystal on silicon chip 5, catoptron 6, second liquid crystal on silicon chip 7 and the 3rd liquid crystal on silicon chip 8; Wherein, from the one or more input C-band continuous light signals in the input port of the M optical fibre collimator array 1; Body grating 3 is converged to by the first Fourier transform optical lens 2; The different wave length passage light signal dispersion in the horizontal direction that different input port inputs by body grating 3 launches; Through the second Fourier transform optical lens 4 meeting coalescence after catoptron 5 reflects, from the light signal parallel radiation of different input ports on the different position of the 3rd liquid crystal on silicon chip 8, and different wave length passage forms dispersion bar in zones of different in respective position, by loading different phase hologram gratings on the corresponding region of the 3rd liquid crystal on silicon chip, produce+1 grade and-1 order diffraction, and realize again pointing to the different wave length passage light signal of different input port; + 1 order diffraction light and-1 order diffraction light are respectively through the first liquid crystal on silicon chip 5 and the second liquid crystal on silicon chip 7, by loading the identical phase hologram grating of the 3rd liquid crystal on silicon chip on corresponding region, the different wave length passage light signal of different input port is arrived successively after the second optical lens 4, body grating 3 and the first optical lens 2, and appointed output terminal that optical fiber collimator battle array 1 arranges saltyly newly becomes collimated light, thus realizes assigning the low-loss from any wavelength channels of any input port to any output port.
Fig. 2 is the functional block diagram of the ROADM device port of embodiment.The theoretical and experimental study result that the aspects such as the technical merit that can reach according to current commercialization LCoS and at present array of ports and prepared by body grating, optical system adjusts, beam shaping and LCoS azimuth coding have obtained, ROADM basic technology performance total optical system achieved by of employing shown in Fig. 1 and the key technical indexes as follows:
(1) can be used as 10 × 30 port ROADM to use: device port arranges block diagram as shown in Fig. 2 (a), comprises 10 input port P
in1~ P
in10, add circulator at each input port, as 10 local drop Voice Channel output port D
1~ D
10, and 20 light network output port P
out1~ P
out20, amount to 30 output ports.Can realize: (a) is from any input port P
inx(x=1,2 ..., 10) any one or one group of wavelength channel arbitrary velocity light signal all can from the port through fiber optical circulator drop Voice Channel to D
xport; B () is from any input port P
inx(x=1,2 ..., 10) the arbitrary velocity light signal of any one or one group of wavelength channel all can from 20 light network output port P
outy(y=1,2 ..., 20) in any one port export;
(2) 30 × 10 port ROADM equipment that can be used as oppositely use: device port arranges block diagram as shown in Fig. 2 (b), now, and former 10 input port P
in1~ P
in10change 10 output port P into
out1~ P
out10, each output port adds circulator, originally 10 local drop Voice Channel output port D
1~ D
10change 10 local up channel port A into
1~ A
10, former 20 light network output port P
out1~ P
out20change 20 light network input port P into
in1~ P
in20, amount to 30 input ports; Can realize: (a) is from any local up channel port A
x(x=1,2 ..., 10) any one or one group of wavelength channel arbitrary velocity light signal all can up channel to except P
outxouter other 9 output ports any; A () is from any input port P
inx(x=1,2 ..., 20) the arbitrary velocity light signal of any one or one group of wavelength channel all can from 10 output port P
outy(y=1,2 ..., 10) in any one port export;
(3) spectrum (fully flexible grid) completely is flexibly supported: Add/drop Voice Channel and the interconnection of supporting the wavelength-division multiplex signals of any channel spacing of more than 12.5GHz and any mixing rate;
(4) insertion loss is less than 10dB, extinction ratio is better than 35dB, interport isolation is better than 30dB, and Polarization Dependent Loss (PDL) is less than 0.5dB, the response time is less than 150ms.
Fig. 3 is azimuth coding for light path design and Beam Control and optimization and space optical interconnect subsystem schematic diagram.The key technical index such as the maximum fiber collimator array number can supported based on the light network equipment of the extensive optics integrated chip of LCoS and most high spectral resolution is mainly subject to the restriction of several core technology key element be mutually closely related as follows.One, the integrated level of LCoS array chip and information carrying capacity (Pixel Dimensions and total pixel number), which dictates that LCoS right ± 1 order diffraction light carries out ability that is efficient and wide-angle azimuth coding, the minimum spot size (the minimum pixel count needed for efficiently pointing to light beam) that must have when simultaneously the light beam also determined corresponding to each wavelength channel is imaged onto LCoS on, the maximum port number that thus can reach whole equipment and most high spectral resolution give a restriction the most basic.Its azimuth coding of two, LCoS and beam-pointing ability are the basic foundations of whole optical system being carried out to light path design, directly determine the most short transmission distance not causing light beam under light path circumstance of occlusion to experience needed for internal system.The integrated level of LCoS is higher, and required beam Propagation distance is shorter.It three is light beam divergence problems in system in communication process.Require that the spot size be imaged onto on LCoS is less, beam propagation distance is longer, and the beam divergence problem of internal system is more serious.Therefore, according to the information carrying capacity of LCoS, the light path of whole optical system and beam sizes are carried out to scientific and reasonable optimized design and controlled to be one of On Key Scientific of solving of the present invention.As shown in Figure 3.This subsystem is made up of the second Fourier transform optical lens 4, composite space photomodulator and the 3rd liquid crystal on silicon chip 8.Composite space photomodulator is touched by a LCoS5 and the 2nd LCoS7 and catoptron 6 placed in the middle and forms, and the apparent size of three LCoS and catoptron is the identical rectangle of specification, and the length of side is respectively a and b, and the length of side of composite space photomodulator is b × 3a.The b limit of three LCoS all in the x-direction, as the demultiplexing of wavelength channel; A limit all in yz plane (drawing), as azimuth coding and space interconnect.Depict a light beam in figure and incide situation in subsystem, for concept and principle statement clear, beam sizes is wherein exaggerated.Wherein the spot size of light beam on the second Fourier transform optical lens 4, composite space photomodulator and the 3rd liquid crystal on silicon chip 8 is labeled as 2W respectively
1, 2W
2and 2W
3.By being f2=T by the focus settings of the second Fourier transform optical lens 4
0+ T/2, wherein, T
0be the distance between the second Fourier transform optical lens 4 and composite space photomodulator, T is the distance between composite space photomodulator and the 3rd liquid crystal on silicon chip 8, then the 2W with a tight waist of light beam
0the middle T/2 place of composite space photomodulator and the 3rd liquid crystal on silicon chip 8 will be positioned at.This design ensure that light beam has approximately uniform spot size on the 3rd liquid crystal on silicon chip 8 and composite space photomodulator, makes the ability of all parts can obtain best performance, thus realizes the optimization of overall performance.Adopt 4K × 2K pixel count LCoS chip, due to the reduction of Pixel Dimensions, the beam-pointing ability of LCoS doubles.Adopt the LCoS set-up mode of a=15.36mm, b=8.64mm.Beam-pointing during employing 4K × 2K pixel count LCoS array chip and spot size result of calculation.Optical system parameter is now T=660mm, T
0=127mm, f2=457mm, W
0optimal design value be 0.4mm, corresponding spot size is W
1=0.664mm, W
2≈ W
3=0.571mm.Thus make the port carrying capacity of whole system reach 12 × 36 ports, for ensureing that equipment has good interport isolation and is set in 10 × 30 ports, to ensure to leave enough portable protective gaps between light beam.
As shown in Fig. 4 (a), liquid crystal on silicon chip is that the phase place by changing incident light realizes optical modulation, according to the principle of blazed grating, liquid crystal on silicon chip can be used to load different position phasors to simulate the modulation of blazed grating to incident light, and concrete operations are exactly make it form periodic phase hologram grating to the periodic voltage that liquid crystal applies suitable size.The maximum advantage of liquid crystal on silicon chip is the parameter such as cycle, blazing angle of change grating that can be real-time, and then changes the blaze wavelength of emergent light, level of glittering time, realizes object controlled flexibly.
Because liquid crystal device is made up of many discrete pixels, this just causes making phase place produce continuous print change when regulating the phase place of light, step-like phase change can only be produced, the Phase Continuation distribution of continuous convergence blazed grating by multiple step changed step by step.Fig. 4 (b) represents the phase grating that liquid crystal simulates, is divided into m the step changed step by step each cycle of phase grating, produce multistage phase outline grating, such light wave will produce the phase differential of 2 π/m by adjacent step, realizes being similar to the phase-modulation of binary echelon grating to incident light; Grating constant is d, and angle of diffraction is θ.Just there occurs when light vertical incidence and stitch Fraunhofer diffraction more, each width is that the small stair of a is equivalent to a slit.
It is finally noted that, the object publicizing and implementing mode is to help to understand the present invention further, but it will be appreciated by those skilled in the art that: without departing from the spirit and scope of the invention and the appended claims, various substitutions and modifications are all possible.Therefore, the present invention should not be limited to the content disclosed in embodiment, and the scope that the scope of protection of present invention defines with claims is as the criterion.
Claims (7)
1. M × N port Reconfigurable Optical Add/drop Multiplexer, it is characterized in that, described optical add/drop multiplexer comprises: the optical fibre collimator array arranged by M+N optical fiber collimator, the first Fourier transform optical lens, body grating, the second Fourier transform optical lens, the first liquid crystal on silicon chip, catoptron, the second liquid crystal on silicon chip and the 3rd liquid crystal on silicon chip; Wherein, from the one or more input continuous light signals in the input port of the M optical fibre collimator array; Body grating is converged to by the first Fourier transform optical lens; The different wave length passage light signal dispersion in the horizontal direction that different input port inputs by body grating launches; Through the second Fourier transform optical lens meeting coalescence after catoptron reflection, from the light signal parallel radiation of different input ports on the different position of the 3rd liquid crystal on silicon chip, and different wave length passage forms dispersion bar in zones of different in respective position, by loading different phase hologram gratings on the corresponding region of the 3rd liquid crystal on silicon chip, produce+1 grade and-1 order diffraction, and the wavelength channel diffraction light dropping on this region is deflected along preset direction; + 1 order diffraction light and-1 order diffraction light are respectively through the first liquid crystal on silicon chip and the second liquid crystal on silicon chip, by loading and the identical phase hologram grating of the 3rd liquid crystal on silicon chip on corresponding region, the different wave length passage light signal of different input port is arrived successively after the second optical lens, body grating and the first optical lens, and appointed output terminal on optical fibre collimator array is salty newly becomes collimated light.
2. optical add/drop multiplexer as claimed in claim 1, it is characterized in that, M port in described optical fibre collimator array is input port, the input port of M one dimensional arrangement be centrally located on optical axis; Remaining N number of port is light network output port,
3. optical add/drop multiplexer as claimed in claim 1, is characterized in that, input port is arranged after circulator as local drop Voice Channel output port.
4. optical add/drop multiplexer as claimed in claim 1, it is characterized in that, described first liquid crystal on silicon chip, the second liquid crystal on silicon chip and catoptron are positioned at same plane, composition composite space photomodulator.
5. optical add/drop multiplexer as claimed in claim 1, is characterized in that, described first Fourier transform optical lens and the second Fourier transform optical lens composition 4f optical information processing system.
6. optical add/drop multiplexer as claimed in claim 1, is characterized in that, the cycle of described phase hologram grating is different, and angle of diffraction is different; By changing the periodic adjustment angle of diffraction of phase hologram grating.
7. a control method for M × N port Reconfigurable Optical Add/drop Multiplexer, is characterized in that, described control method comprises the following steps:
1) from the one or more input continuous light signals in the input port of the M optical fibre collimator array;
2) body grating is converged to by the first Fourier transform optical lens;
3) the different wave length passage light signal dispersion in the horizontal direction that different input port inputs by body grating launches;
4) coalescence is understood after catoptron reflection through the second Fourier transform optical lens, from the light signal parallel radiation of different input ports on the different position of the 3rd liquid crystal on silicon chip, and different wave length passage forms dispersion bar in zones of different in respective position, by loading different phase hologram gratings on the corresponding region of the 3rd liquid crystal on silicon chip, produce+1 grade and-1 order diffraction, and make the wavelength channel diffraction light dropping on this region along the deflection of preset direction, realize the sensing again of the different wave length passage light signal of different input port;
5)+1 order diffraction light and-1 order diffraction light are respectively through the first liquid crystal on silicon chip and the second liquid crystal on silicon chip, by loading and the identical phase hologram grating of the 3rd liquid crystal on silicon chip on corresponding region, the different wave length passage light signal of different input port is arrived successively after the second optical lens, body grating and the first optical lens, and appointed output terminal on optical fibre collimator array is salty newly becomes collimated light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510148337.1A CN104730644B (en) | 2015-03-11 | 2015-03-31 | A kind of M based on compound liquid crystal on silicon × N-port ROADM and its control method |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510106863 | 2015-03-11 | ||
| CN2015101068631 | 2015-03-11 | ||
| CN201510148337.1A CN104730644B (en) | 2015-03-11 | 2015-03-31 | A kind of M based on compound liquid crystal on silicon × N-port ROADM and its control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104730644A true CN104730644A (en) | 2015-06-24 |
| CN104730644B CN104730644B (en) | 2017-05-31 |
Family
ID=53454714
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510148337.1A Active CN104730644B (en) | 2015-03-11 | 2015-03-31 | A kind of M based on compound liquid crystal on silicon × N-port ROADM and its control method |
| CN201520189398.8U Expired - Fee Related CN204479798U (en) | 2015-03-11 | 2015-03-31 | A kind of M × N port Reconfigurable Optical Add/drop Multiplexer based on compound liquid crystal on silicon |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520189398.8U Expired - Fee Related CN204479798U (en) | 2015-03-11 | 2015-03-31 | A kind of M × N port Reconfigurable Optical Add/drop Multiplexer based on compound liquid crystal on silicon |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN104730644B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116488A (en) * | 2015-08-31 | 2015-12-02 | 华中科技大学 | Optical power beam splitter |
| CN105388619A (en) * | 2015-12-21 | 2016-03-09 | 武汉邮电科学研究院 | Test method for reducing loss spectra ripple |
| CN105739026A (en) * | 2016-03-28 | 2016-07-06 | 武汉光迅科技股份有限公司 | High-port-number wavelength selection switch |
| CN106027134A (en) * | 2016-05-20 | 2016-10-12 | 扬州大学 | Photonic microwave phased array transceiving system and method thereof |
| CN106772820A (en) * | 2016-12-16 | 2017-05-31 | 中央民族大学 | High port number wavelength-selective switches and its control method based on optical beam-expanding unit |
| CN106772813A (en) * | 2016-12-16 | 2017-05-31 | 中央民族大学 | Resolution ratio wavelengthtunable selecting switch and control method based on phase grating array |
| CN109254436A (en) * | 2018-11-13 | 2019-01-22 | 徐州诺派激光技术有限公司 | Bandwidth, tunable wavelength filter and its working method based on liquid crystal array |
| CN114185135A (en) * | 2021-12-10 | 2022-03-15 | 中央民族大学 | Implementation method of folding type MXN port wavelength selection switch |
| US11353653B2 (en) | 2018-06-29 | 2022-06-07 | Huawei Technologies Co., Ltd. | Optical waveguide apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113703241B (en) * | 2020-05-21 | 2022-10-18 | 华为技术有限公司 | LCOS adjusting method, optical device and reconfigurable optical add-drop multiplexer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110076016A1 (en) * | 2009-09-29 | 2011-03-31 | Philip Wisseman | Methods for Expanding Cross-Connect Capacity in a ROADM Optical Network |
| CN102590952A (en) * | 2012-02-29 | 2012-07-18 | 华中科技大学 | Multi-channel dynamic optical dispersion compensator |
| CN103281153A (en) * | 2013-06-20 | 2013-09-04 | 中央民族大学 | Reconfigurable optical add drop multiplexer based on M*N ports of silicon substrate liquid crystal |
| JP2014533018A (en) * | 2011-10-28 | 2014-12-08 | ネオフォトニクス・コーポレイションＮｅｏＰｈｏｔｏｎｉｃｓ Ｃｏｒｐｏｒａｔｉｏｎ | Scalable optical switch and switching module |
-
2015
- 2015-03-31 CN CN201510148337.1A patent/CN104730644B/en active Active
- 2015-03-31 CN CN201520189398.8U patent/CN204479798U/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110076016A1 (en) * | 2009-09-29 | 2011-03-31 | Philip Wisseman | Methods for Expanding Cross-Connect Capacity in a ROADM Optical Network |
| JP2014533018A (en) * | 2011-10-28 | 2014-12-08 | ネオフォトニクス・コーポレイションＮｅｏＰｈｏｔｏｎｉｃｓ Ｃｏｒｐｏｒａｔｉｏｎ | Scalable optical switch and switching module |
| CN102590952A (en) * | 2012-02-29 | 2012-07-18 | 华中科技大学 | Multi-channel dynamic optical dispersion compensator |
| CN103281153A (en) * | 2013-06-20 | 2013-09-04 | 中央民族大学 | Reconfigurable optical add drop multiplexer based on M*N ports of silicon substrate liquid crystal |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116488B (en) * | 2015-08-31 | 2017-11-17 | 华中科技大学 | A kind of luminous power beam splitter |
| CN105116488A (en) * | 2015-08-31 | 2015-12-02 | 华中科技大学 | Optical power beam splitter |
| CN105388619A (en) * | 2015-12-21 | 2016-03-09 | 武汉邮电科学研究院 | Test method for reducing loss spectra ripple |
| CN105388619B (en) * | 2015-12-21 | 2018-03-20 | 武汉邮电科学研究院 | A kind of test method for reducing loss spectra ripple |
| CN105739026A (en) * | 2016-03-28 | 2016-07-06 | 武汉光迅科技股份有限公司 | High-port-number wavelength selection switch |
| CN105739026B (en) * | 2016-03-28 | 2019-12-31 | 武汉光迅科技股份有限公司 | High port number wavelength selective switch |
| CN106027134A (en) * | 2016-05-20 | 2016-10-12 | 扬州大学 | Photonic microwave phased array transceiving system and method thereof |
| CN106027134B (en) * | 2016-05-20 | 2019-09-20 | 扬州大学 | A kind of photon phased array of microwaves receive-transmit system and its method |
| CN106772813A (en) * | 2016-12-16 | 2017-05-31 | 中央民族大学 | Resolution ratio wavelengthtunable selecting switch and control method based on phase grating array |
| CN106772820A (en) * | 2016-12-16 | 2017-05-31 | 中央民族大学 | High port number wavelength-selective switches and its control method based on optical beam-expanding unit |
| US11353653B2 (en) | 2018-06-29 | 2022-06-07 | Huawei Technologies Co., Ltd. | Optical waveguide apparatus |
| CN109254436A (en) * | 2018-11-13 | 2019-01-22 | 徐州诺派激光技术有限公司 | Bandwidth, tunable wavelength filter and its working method based on liquid crystal array |
| CN114185135A (en) * | 2021-12-10 | 2022-03-15 | 中央民族大学 | Implementation method of folding type MXN port wavelength selection switch |
| CN114185135B (en) * | 2021-12-10 | 2023-10-20 | 中央民族大学 | Implementation method of folding type MXN port wavelength selective switch |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104730644B (en) | 2017-05-31 |
| CN204479798U (en) | 2015-07-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204479798U (en) | A kind of M × N port Reconfigurable Optical Add/drop Multiplexer based on compound liquid crystal on silicon | |
| CN103281153B (en) | A kind of Reconfigurable Optical Add/drop Multiplexer of the M × N port based on liquid crystal on silicon | |
| US7277640B2 (en) | Optical add/drop multiplexing systems | |
| EP3013066B1 (en) | Optical cross-connect | |
| US20160360301A1 (en) | Contentionless NxM Wavelength Cross Connect | |
| CN105229945A (en) | There is the wavelength-selective switches of integrated channel monitor | |
| US11855755B2 (en) | WDM1r combiner for PON | |
| CN103353633B (en) | Wavelength-selective switches and Wavelength selecting method | |
| CN106772820A (en) | High port number wavelength-selective switches and its control method based on optical beam-expanding unit | |
| US10560186B2 (en) | Optical power equilibrium method and apparatus | |
| CN103197388A (en) | C and L waveband wavelength selecting switch, as well as implementation method and processing unit thereof | |
| Frisken et al. | Wavelength-selective reconfiguration in transparent agile optical networks | |
| CN203311035U (en) | M*N port reconfigurable optical add drop multiplexer based on liquid crystal on silicon | |
| CN105739026A (en) | High-port-number wavelength selection switch | |
| US9654851B2 (en) | Optical cross-connect device | |
| CN111221081A (en) | Wavelength selective switch based on LCoS | |
| Marom et al. | Networking and routing in space-division multiplexed systems | |
| Suzuki et al. | A transponder aggregator with efficient use of filtering function for transponder noise suppression | |
| Asano et al. | Cost Comparison of Hierarchical Optical Cross-Connect Architectures for Spatial Channel Networks (SCNs) | |
| JP6491563B2 (en) | Optical cross-connect device | |
| Calabretta et al. | Programmable modular photonic integrated switches for beyond 5G metro optical networks | |
| CN107976748A (en) | Multiple port wavelength selecting switch and its method based on polarization beam splitting double diffraction grating | |
| US11899244B2 (en) | Wavelength selective switch | |
| EP3745617B1 (en) | Optical cross-connect device | |
| JP6898553B2 (en) | Optical signal processor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |