CN104730644B - A kind of M based on compound liquid crystal on silicon × N-port ROADM and its control method - Google Patents
A kind of M based on compound liquid crystal on silicon × N-port ROADM and its control method Download PDFInfo
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- CN104730644B CN104730644B CN201510148337.1A CN201510148337A CN104730644B CN 104730644 B CN104730644 B CN 104730644B CN 201510148337 A CN201510148337 A CN 201510148337A CN 104730644 B CN104730644 B CN 104730644B
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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
- 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
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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
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Abstract
The invention discloses a kind of M based on compound liquid crystal on silicon × N-port ROADM and its control method.M of the invention × N-port ROADM includes：Optical fibre collimator array, the first Fourier transform optical lens, body grating, the second Fourier transform optical lens, the first liquid crystal on silicon chip LCoS, speculum, the 2nd LCoS and the 3rd LCoS arranged by M+N optical fiber collimator；Being produced simultaneously on 3rd LCoS ± 1 order diffraction and carries out first time azimuth coding, second and the 3rd LCoS carry out second orientation adjustment, to realize any wavelength channel optical signal from any input port to the low loss interconnection of any output port.The clog-free optical cross connect function of the achievable M × N-port of the present invention, with simple structure, be easily achieved, pass-band performance is adjustable, support flexible spectrum, remote software control can be carried out, can be used separately as the node of intelligent wavelength switched optical network the features such as.
Description
Technical field
The present invention relates to optical add/drop multiplexer, more particularly to a kind of M based on compound liquid crystal on silicon × N-port reconfigurable optical
Add-drop multiplexer and its control method.
Background technology
The high port number M × N-port that remote control can be carried out with software and has multiple input and output ports can be weighed
Structure optical add/drop multiplexer ROADM and multidimensional light network OXC equipment are to build the key that intelligent software defines reconfigurable optical network
Property core component, with extremely important application prospect and international market value, receives each main optic communication in international coverage
Research institution and the extensive concern of device and equipment supplier.In recent years, about achievement in research and disclosed patented technology side
In the trend that steeply rises, associated core technical scheme also has been subjected to from the first generation based on wavelength blocker WB case quantity
ROADM, the second generation ROADM based on array waveguide grating AWG and optical switch matrix are to based on 1 × N-port wavelength-selective switches
The rapid development of the third generation ROADM of WSS and development.The first generation and second generation ROADM technologies are due in spectrum flexibility, technique
Be present many wretched insufficiencies in complexity and job stability aspect, abandoned substantially at present
At present, the mainstream technology of multidimensional OXC equipment is mainly used and put with Er-doped fiber by a large amount of 1 × N wavelength selecting switch
The third generation ROADM technologies of the combination of devices such as big device (EDFA), optical splitter.Wherein more typical patented technology has：
The apllied United States Patent (USP)s of M.D.Feuer et al. " Growable Multi-Degree ROADM " (patent No.：
US20100124391A1, publication date：On May 20th, 2010), the apllied United States Patent (USP)s of P.Wisseman " Method for
Dynamic Wavelength Add/Drop in a ROADM the Network " (patent No.s：US20100142961A1, it is open
Day：On June 10th, 2010) and " Method for Expanding Cross-Connect Capacity in a ROADM
Optical the Network " (patent No.s：US20110076016A1, publication date：On March 31st, 2011), the U.S.
The apllied United States Patent (USP) of Neophotonics companies " Scalable Optical Switches and Switching
The Modules " (patent No.s：US20130108215A1, publication date：On May 2nd, 2013), different simply connected modes are not
Together.Due to a large amount of using WSS and the concatenation of optical splitter, these technical schemes generally have big insertion loss, structure and control system
Many wretched insufficiencies such as system is complicated, fault rate is high, pass-band performance is limited.
In recent years, many research institutions both domestic and external have actively developed integrated M of new generation × N-port ROADM equipment
Research.Japanese keio university has succeeded in developing with 5 × 5 ports clog-free one using two MEMS Opto-VLSI chips
Body ROADM equipment, Finisar companies have developed 2 × 4 ports integration ROADM based on LCoS chips, Santec companies report
Road is by developing the tool that 12 × 12 port wavelength blocker WB and 81 × 4 photo-couplers based on LCoS chips are combined
There is the ROADM of 4 × 4 port numbers, Alcatel-Lucent AT＆T Labs have developed based on LCoS chips, be capable of achieving 15 kinds of connections
5 × 5 ports integration ROADM of mode, Australian Edith Cowan universities report 2 × 4 developed based on LCoS chips
The clog-free ROADM in port, Huawei Company reported clog-free with 8 × 8 ports of two pieces of LCoS chips developments in 2014
ROADM.The forth generation ROADM that wherein Huawei Company is developed has the highest port number reported so far, but inside it
Optical System Design is similar to two series connection of 1 × 8WSS, thus contains two sets of substantially identical optical systems, causes whole
The optical component count that individual system is used is more, and system composition is complex.Therefore, design and develop structure and control skill
Art is simple, spectral characteristic flexibly adjustable, insertion loss small integrated M × N-port high port number forth generation ROADM equipment into
It is a hot subject of current optical communication field.
The content of the invention
For the above-mentioned problems in the prior art, the present invention proposes a kind of ROADM, especially
It is the M × N-port ROADM for carrying out secondary sensing to light beam by liquid crystal on silicon chip LCoS；With 10 × 30
More than port, support more than 32 wavelength channels, bandwidth chahnel and channel spacing is adjustable, compatible various different rates and interchannel
Every DWDM signals, any wavelength, any direction and clog-free ROADM that remote software control can be carried out.
Insert multiple it is an object of the present invention to provide a kind of M based on compound liquid crystal on silicon × N-port reconfigurable optical point
Use device.
M of the invention × N-port ROADM includes：The light arranged by M+N optical fiber collimator
Fine collimator array, the first Fourier transform optical lens, body grating, the second Fourier transform optical lens, the first silicon substrate liquid
Brilliant chip, speculum, the second liquid crystal on silicon chip and the 3rd liquid crystal on silicon chip；Wherein, from M in optical fibre collimator array
One or more continuous optical signals of input in input port；Body grating is converged to by the first Fourier transform optical lens；Body
The different wave length passage optical signal dispersion in the horizontal direction that be input into for different input ports by grating launches；Become through the second Fourier
After changing the reflected mirror reflection of optical lens meeting coalescence, the optical signal parallel radiation from different input ports to the 3rd silicon substrate liquid
On the different position of brilliant chip, and in respective position different wave length passage different zones formed dispersion bar, by
Different phase hologram gratings are loaded on the corresponding region of the 3rd liquid crystal on silicon chip ,+1 grade and -1 order diffraction is produced, and make
The wavelength channel diffraction light in the region that must fall is deflected along preset direction；+ 1 order diffraction light and -1 order diffraction light respectively through
First liquid crystal on silicon chip and the second liquid crystal on silicon chip, by corresponding region load it is complete with the 3rd liquid crystal on silicon chip
Exactly the same phase hologram grating, make different input ports different wave length passage optical signal sequentially pass through the second optical lens,
The appointed output terminal reached after body grating and the first optical lens on optical fibre collimator array is salty newly as collimated light, so that real
Now the low-loss from any wavelength channels of any input port to any output port is assigned.
Optical fibre collimator array of the invention is made up of M+N optical fibre collimator array of one dimensional arrangement, wherein, optical fiber is accurate
M port in straight device array is input port, and the input port of M one dimensional arrangement is centrally located on optical axis；Remaining is N number of
Port is light network output port, and the output port of N number of one dimensional arrangement is located at the M both sides of input port into symmetrical row respectively
Row.It is also simultaneously local drop Voice Channel output port after circulator is set on input port, from a light for input port input
Signal, returns to this input port and is exported through circulator, so as to as wavelength blocker again after reflected mirror reflection.Using one-dimensional
The outstanding advantages of array of ports are easily prepared and are easily achieved the filter with low insertion loss light network between port.
The present invention is located at same by two pieces of LCoS (the first liquid crystal on silicon chip and the second liquid crystal on silicon chip) and speculum
Plane, constitutes composite space optical modulator.Its effect is that finite sum port carrying capacity is not enough on a large scale LCoS collection is overcome
Meanwhile, the optical signal from input port is reflexed into the 3rd liquid crystal on silicon chip, and to complete on the 3rd liquid crystal on silicon chip
Light beam into first time azimuth coding carries out second orientation adjustment, to realize any wavelength channel from any input port
Low loss interconnection of the optical signal to any output port.
The present invention constitutes 4f optical information by the first Fourier transform optical lens and the second Fourier transform optical lens
Processing system, the diverse location that will be imaged onto after the different reflected mirrors of input port array on the 3rd liquid crystal on silicon chip y directions,
The return optical signal after direction is assigned is collimated to corresponding output port simultaneously.Optical fibre collimator array is located at first Fu
In leaf transformation optical lens side focal point；Body grating is located at the focus of the opposite side of the first Fourier transform optical lens
Place；Body grating is located at the focal point of the side of the second Fourier transform optical lens；The liquid crystal on silicon chip of reflected mirror the 3rd position
In in the focus of the opposite side of the second Fourier transform optical lens.
The present invention is with the effect of dispersion of high density delineation body grating by the picture from each input port in the 3rd silicon substrate liquid
Corresponding rectangle dispersion collection of illustrative plates is launched into by wavelength in the x-direction on position corresponding to the respective input port of brilliant chip, makes to come
The different zones to the 3rd liquid crystal on silicon chip are demultiplexed from the different wave length passage optical signal of different input ports, while complete
The multiplexing function of each wavelength channel optical signal on the x directions returned after being assigned through direction in pairs.Using transmission-type phase hologram light
Grid have and polarize unrelated, insertion loss and the remarkable advantage such as be greatly reduced.And in the respective input port of the 3rd liquid crystal on silicon chip
Corresponding different zones loading phase hologram grating, while producing+1 grade and -1 order diffraction ,+1 order diffraction light is by the first silicon
Base liquid crystal chip, -1 order diffraction light is by the second liquid crystal on silicon chip；And cause on the wavelength channel diffraction light edge in the region
Preset direction deflection, realizes pointing to the different wave length passage optical signal of different input ports again.
Inserted it is another object of the present invention to provide a kind of M based on compound liquid crystal on silicon × N-port reconfigurable optical point
The control method of multiplexer.
The control method of M of the invention × N-port ROADM, comprises the following steps：
1) from one or more the continuous optical signals of input in M input port in optical fibre collimator array；
2) body grating is converged to by the first Fourier transform optical lens；
3) the different wave length passage optical signal dispersion in the horizontal direction that be input into for different input ports by body grating launches；
4) after being reflected through the second Fourier transform optical lens meeting reflected mirror of coalescence, the light from different input ports
Signal parallel radiation on the different position of the 3rd liquid crystal on silicon chip, and in respective position different wave length passage not
Dispersion bar is formed with region, by loading different phase hologram gratings on the corresponding region of the 3rd liquid crystal on silicon chip,
+ 1 grade and -1 order diffraction are produced, and realizes the sensing again of the different wave length passage optical signal of different input ports；
5)+1 order diffraction light and -1 order diffraction light lead to respectively through the first liquid crystal on silicon chip and the second liquid crystal on silicon chip
Loading and the identical phase hologram grating of the 3rd liquid crystal on silicon chip on corresponding region are crossed, makes different input ports
Different wave length passage optical signal reaches optical fiber collimator battle array after sequentially passing through the second optical lens, body grating and the first optical lens
Appointed output terminal on row is salty newly as collimated light, so as to realize to taking office from any wavelength channels of any input port
The low-loss of meaning output port is assigned.
The present invention is corresponding on the 3rd liquid crystal on silicon chip to the different wave length passage optical signal from each input port
Region loads different spaces periodic phase holographic grating and realizes right+1 grade (to the first liquid crystal on silicon chip) or -1 grade in the y-direction
The first time azimuth coding (angle of diffraction is different) of (to the second liquid crystal on silicon chip) diffraction light, realizes the difference of different input ports
Again the sensing of wavelength channel optical signal.The cycle of phase hologram grating is different, and the angle of diffraction is different；By changing phase hologram light
The periodic adjustment angle of diffraction of grid.Simultaneously to from the 3rd silicon substrate liquid on the first liquid crystal on silicon chip and the second liquid crystal on silicon chip
Loading and identical phase hologram on the 3rd liquid crystal on silicon chip respective regions on region shared by the light beam of brilliant chip
Grating can make all light beams revert to the collimated light beam propagated along-z directions, complete second orientation adjustment of light beam.It is this
Design can make the software control system of the computing of phase hologram grating and loading procedure and whole machine greatly simplified, so that building
The response time of vertical link is shortened.
ROADM of the invention can realize the clog-free light network function of M × N-port, with structure letter
It is single, be easily achieved, pass-band performance is adjustable, support flexible spectrum, can carry out remote software control, can be separately as intelligent wavelength
The features such as node of switched optical network is used.
Advantages of the present invention：
(1) present invention realizes the ROADM of the M × N-port based on liquid crystal on silicon chip, adds using in liquid crystal on silicon chip
The method for carrying the phase hologram grating of different two-dimensional orientations, light beam phase is modulated by the orientation in the cycle and grating that change grating
Position, realizes efficient, flexible assignment of the optics large scale integrated chip (LSI chip) to the two-dimensional directional of incident wavelength passage；
(2) present invention proposes light beam is entered into composite space optical modulator with one piece of speculum group with two pieces of LCoS chip
The technical scheme that row secondary optics are pointed to, it is fully sharp in the case where the light beam space of LCoS chips assigns ability extremely limited
The characteristics of having identical sensing ability and diffraction efficiency on+1 grade with -1 grade of both direction with LCoS, not only realizes
Device port number is multiplied, and makes the whole optical system compacter, is also easier to overall package and the adjustment of light path,
And the various technical schemes reported so far only make use of LCoS in the first-order diffraction light of its normal side, cause to this
Very not enough LCoS light beams point to the waste of ability；
(3) while LCoS chip ports carrying capacity deficiency is solved, using the 4f Optical System Designs of novelty, grind
Make that general structure is succinct, component technology is ripe, wavelength stable and reliable for performance is unrelated, direction is unrelated, it is clog-free, support flexible
Spectrum (Flexible Grid), 10 × 30 port above integration apparatus that remote software control can be carried out；
(4) in the world compared with existing integrated M × N-port ROADM technical schemes, above-mentioned design is not with present for the present invention
The optical fibre collimator array number of equipment is increased dramatically, and with optical system and control system it is simple, close
The advantages of key member is easily prepared, light path assembling and adjustment are convenient, performance is more reliable and more stable.
Brief description of the drawings
Fig. 1 is the index path of M of the invention × N-port ROADM；
Fig. 2 is the functional block diagram of the ROADM device ports of one embodiment of the present of invention, wherein, (a) is used as 10 × 30 ends
Mouth ROADM, (b) is used as 30 × 10 port ROADM；
Fig. 3 is for light path design and Beam Control and the azimuth coding for optimizing and space light network subsystem schematic diagram；
Fig. 4 is the schematic diagram of the echelon coding of the liquid crystal on silicon chip that the present invention is used, wherein, (a) is compiled for grating
Code figure, the diffraction pattern of (b) grating encoding.
Specific embodiment
Below in conjunction with the accompanying drawings, by embodiment, the present invention is expanded on further.
As shown in figure 1, in the present embodiment, M=10, N=20 set circulator on input port, and input port is simultaneously
As local drop Voice Channel output port, the ROADM of 10 × (20+10) ports, M × N-port restructural are formed
Optical add/drop multiplexer includes：Optical fibre collimator array 1, the first Fourier transformation light arranged by M+N optical fiber collimator
Learn lens 2, body grating 3, the second Fourier transform optical lens 4, the first liquid crystal on silicon chip 5, speculum 6, the second silicon substrate liquid
The liquid crystal on silicon chip 8 of brilliant chip 7 and the 3rd；Wherein, from M input port in optical fibre collimator array 1 or many
The individual input continuous optical signal of C-band；Body grating 3 is converged to by the first Fourier transform optical lens 2；Body grating 3 is defeated by difference
The different wave length passage optical signal dispersion in the horizontal direction of inbound port input launches；Through the second Fourier transform optical lens 4
Can after the reflected mirror 5 of coalescence reflects, the optical signal parallel radiation from different input ports to the 3rd liquid crystal on silicon chip 8 not
On same position, and different wave length passage forms dispersion bar in different zones in respective position, by the 3rd silicon substrate
Different phase hologram gratings are loaded on the corresponding region of liquid crystal chip ,+1 grade and -1 order diffraction is produced, and realize to difference
The different wave length passage optical signal of input port is pointed to again；+ 1 order diffraction light and -1 order diffraction light are respectively through the first silicon substrate liquid
The liquid crystal on silicon chip 7 of brilliant chip 5 and second, by loading the 3rd identical phase of liquid crystal on silicon chip on corresponding region
Position holographic grating, makes the different wave length passage optical signal of different input ports sequentially pass through the second optical lens 4, the and of body grating 3
After first optical lens 2 reach optical fiber collimator battle array 1 row on appointed output terminal it is salty newly turn into collimated light so that realize to from
The low-loss of any wavelength channels of any input port to any output port is assigned.
Fig. 2 is the functional block diagram of the ROADM device ports of embodiment.According to the current commercialization LCoS technologies to be reached
Level and the aspect such as current array of ports and body grating preparation, optical system adjustment, beam shaping and LCoS azimuth codings are
Theoretical and experimental study result through obtaining, it is basic using the ROADM achieved by the total optical system design shown in Fig. 1
Technical performance and the key technical indexes are as follows：
(1) can be used as 10 × 30 port ROADM：Device port is arranged shown in block diagram such as Fig. 2 (a), including 10 defeated
Inbound port Pin1~Pin10, circulator is added in each input port, as 10 local drop Voice Channel output port D1~D10,
And 20 light network output port Pout1~Pout20, amount to 30 output ports.It is capable of achieving：A () comes from any input port
PinxAny one or one group of arbitrary velocity optical signal of wavelength channel of (x=1,2 ..., 10) can be from the ports through fiber optic loop
Row device drop Voice Channel is to DxPort；B () comes from any input port PinxAny one or one group of wavelength of (x=1,2 ..., 10) lead to
The arbitrary velocity optical signal in road can be from 20 light network output port PoutyAny one port in (y=1,2 ..., 20)
Output；
(2) can reversely be used as 30 × 10 port ROADM equipment：Device port is arranged shown in block diagram such as Fig. 2 (b), this
When, 10 input port P of originalin1~Pin10It is changed into 10 output port Pout1~Pout10, added on each output port
Plus circulator, 10 local drop Voice Channel output port D originally1~D10It is changed into 10 local up channel port A1~A10,
20 light network output port P of originalout1~Pout20It is changed into 20 light network input port Pin1~Pin20, amount to 30 inputs
Port；It is capable of achieving：A () is from any local up channel port AxAny one or one group of wavelength channel of (x=1,2 ..., 10)
Arbitrary velocity optical signal can up channel to remove PoutxOuter any other 9 output ports；A () comes from any input port
PinxAny one or one group of arbitrary velocity optical signal of wavelength channel of (x=1,2 ..., 20) can be from 10 output ports
PoutyAny one port output in (y=1,2 ..., 10)；
(3) completely flexible spectrum (fully flexible grid) is supported：Support 12.5GHz any of the above channel spacings
Add/drop Voice Channel and interconnection with the wavelength-division multiplex signals of any mixing rate；
(4) insertion loss is better than 30dB, Polarization Dependent Loss less than 10dB, extinction ratio better than 35dB, interport isolation
(PDL) it is less than 150ms less than 0.5dB, response time.
Fig. 3 is for light path design and Beam Control and the azimuth coding for optimizing and space light network subsystem schematic diagram.
Maximum fiber collimator array number and most bloom that light network equipment based on the extensive optics integrated chips of LCoS can be supported
The key technical index such as spectral resolution are mainly subject to restricting for following several core technology key elements being mutually closely related.First,
The integrated level of LCoS array chips and information carrying capacity (Pixel Dimensions and total pixel number), which dictates that right ± 1 grade of LCoS spreads out
The ability that light carries out efficient and wide-angle azimuth coding is penetrated, while also determining that the light beam corresponding to each wavelength channel is imaged onto
The minimum spot size to be had when on LCoS (carries out the minimum pixel count needed for efficiently pointing to light beam), thus to whole
The individual equipment maximum port number to be reached gives a most basic limitation with highest spectral resolution.Second, LCoS
It is the basic foundation that light path design is carried out to whole optical system that azimuth coding and light beam point to ability, directly determines and is not making
The most short transmission distance that light beam experiences needed for internal system under into light path circumstance of occlusion.The integrated level of LCoS is higher, required
Beam Propagation distance is shorter.The third is divergence problem of the light beam in communication process in system.It is required that the light being imaged onto on LCoS
Spot size is smaller, and beam propagation distance is more long, and the beam divergence problem of internal system is more serious.Therefore, according to the letter of LCoS
It is this hair that breath carrying capacity carries out scientific and reasonable optimized design with control to the light path of whole optical system with beam sizes
One of On Key Scientific of bright solution.As shown in Figure 3.The subsystem is by the second Fourier transform optical lens 4, compound
Spatial light modulator and the 3rd liquid crystal on silicon chip 8 are constituted.Composite space optical modulator is by a LCoS5 and the 2nd LCoS7
And the contiguity of speculum 6 placed in the middle is constituted, the apparent size of three LCoS and speculum is specification identical rectangle, length of side difference
It is a and b, the length of side of composite space optical modulator is b × 3a.Three b sides of LCoS in the x-direction, the solution as wavelength channel
Multiplexing；A sides interconnect in yz planes (drawing) as azimuth coding and space.A light beam is depicted in figure and incides son
Situation in system, is that concept and principle statement are clear, and beam sizes therein are exaggerated.Wherein light beam is in the second Fourier
Spot size on transform optics lens 4, composite space optical modulator and the 3rd liquid crystal on silicon chip 8 is respectively labeled as 2W1、
2W2And 2W3.It is set as f2=T by by the focal length of the second Fourier transform optical lens 40+ T/2, wherein, T0It is in second Fu
The distance between leaf transformation optical lens 4 and composite space optical modulator, T is composite space optical modulator and the 3rd liquid crystal on silicon
The distance between chip 8, the then 2W with a tight waist of light beam0To be located in composite space optical modulator and the 3rd liquid crystal on silicon chip 8
Between at T/2.It is approximately uniform that the design ensure that light beam has on the 3rd liquid crystal on silicon chip 8 and composite space optical modulator
Spot size, making the ability of all parts can most preferably be played, so as to realize the optimization of overall performance.Using 4K × 2K
Pixel count LCoS chips, due to the reduction of Pixel Dimensions, the light beam of LCoS points to ability and doubles.Using a=15.36mm, b
The LCoS set-up modes of=8.64mm.Light beam during using 4K × 2K pixel count LCoS array chips is pointed to and spot size is calculated
As a result.Optical system parameter now is T=660mm, T0=127mm, f2=457mm, W0Optimal design value be 0.4mm, phase
The spot size answered is W1=0.664mm, W2≈W3=0.571mm.So that the port carrying capacity of whole system has reached 12
× 36 ports, for there is guarantee equipment good interport isolation to be set in 10 × 30 ports, to ensure to leave foot in light interfascicular
Enough portable protective gaps.
As shown in Fig. 4 (a), liquid crystal on silicon chip is to realize light modulation by changing the phase of incident light, according to glittering
The principle of grating, it is possible to use liquid crystal on silicon chip loads different position phasors to simulate tune of the balzed grating, to incident light
System, concrete operations are exactly to apply appropriately sized periodic voltage to liquid crystal to form it into periodic phase hologram grating.Silicon
Base liquid crystal chip biggest advantage is that can in real time change the parameters such as cycle, the blaze angle of grating, and then changes emergent light
Blaze wavelength, level of glittering, realize flexibly controllable purpose.
Because liquid crystal device is made up of many discrete pixels, this can not produce phase when resulting in the phase of regulation light
Raw continuous change, can only produce step-like phase change, continuous convergence to glare by multiple steps for changing step by step
The Phase Continuation distribution of grid.Fig. 4 (b) represents the phase grating that simulates of liquid crystal, by each cycle of phase grating be divided into m by
The step of level change, produces multistage phase outline grating, such light wave that the phase difference of 2 π/m will be produced by adjacent step,
Realize the phase-modulation to incident light similar to binary echelon；Grating constant is d, and the angle of diffraction is θ.When light vertical incidence
Many seam Fraunhofer diffractions are just there occurs, each width is the small stair of a equivalent to a slit.
It is finally noted that, the purpose for publicizing and implementing mode is that help further understands the present invention, but ability
The technical staff in domain is appreciated that：Without departing from the spirit and scope of the invention and the appended claims, it is various replacement and
Modification is all possible.Therefore, the present invention should not be limited to embodiment disclosure of that, the scope of protection of present invention with
The scope that claims are defined is defined.
Claims (7)
1. a kind of M × N-port ROADM, it is characterised in that the optical add/drop multiplexer includes：By M+N
The optical fibre collimator array of optical fiber collimator arrangement, the first Fourier transform optical lens, body grating, the second Fourier become
Change optical lens, the first liquid crystal on silicon chip, speculum, the second liquid crystal on silicon chip and the 3rd liquid crystal on silicon chip；Wherein, from
One or more continuous optical signals of input in M input port in optical fibre collimator array；By the first Fourier transformation light
Learn lens and converge to body grating；The different wave length passage optical signal that be input into for different input ports by body grating is painted in the horizontal direction
Dissipate and launch；After being reflected through the second Fourier transform optical lens meeting reflected mirror of coalescence, the light letter from different input ports
Number parallel radiation on the different position of the 3rd liquid crystal on silicon chip, and in respective position different wave length passage in difference
Region forms dispersion bar, by loading different phase hologram gratings on the corresponding region of the 3rd liquid crystal on silicon chip, produces
Raw+1 grade and -1 order diffraction, and cause that the wavelength channel diffraction light in the region is deflected along preset direction；+ 1 order diffraction
Light and -1 order diffraction light add respectively through the first liquid crystal on silicon chip and the second liquid crystal on silicon chip by corresponding region
Carry and the identical phase hologram grating of the 3rd liquid crystal on silicon chip, make the different wave length passage optical signal of different input ports
Optical fiber collimator is reached after sequentially passing through the second Fourier transform optical lens, body grating and the first Fourier transform optical lens
Appointed output terminal on array is salty newly as collimated light.
2. optical add/drop multiplexer as claimed in claim 1, it is characterised in that M port in the optical fibre collimator array
It is input port, the input port of M one dimensional arrangement is centrally located on optical axis；Remaining N number of port is light network output end
Mouthful.
3. optical add/drop multiplexer as claimed in claim 1, it is characterised in that as this after setting circulator on input port
Ground drop Voice Channel output port.
4. optical add/drop multiplexer as claimed in claim 1, it is characterised in that the first liquid crystal on silicon chip, the second silicon substrate
Liquid crystal chip and speculum are generally aligned in the same plane, and constitute composite space optical modulator.
5. optical add/drop multiplexer as claimed in claim 1, it is characterised in that the first Fourier transform optical lens and
Two Fourier transform optical lens constitute 4f optical information processing systems.
6. optical add/drop multiplexer as claimed in claim 1, it is characterised in that the cycle of the phase hologram grating is different, spreads out
Firing angle is different；By the periodic adjustment angle of diffraction for changing phase hologram grating.
7. the control method of a kind of M × N-port ROADM, it is characterised in that the control method include with
Lower step：
1) from one or more the continuous optical signals of input in M input port in optical fibre collimator array；
2) body grating is converged to by the first Fourier transform optical lens；
3) the different wave length passage optical signal dispersion in the horizontal direction that be input into for different input ports by body grating launches；
4) after being reflected through the second Fourier transform optical lens meeting reflected mirror of coalescence, the optical signal from different input ports
Parallel radiation on the different position of the 3rd liquid crystal on silicon chip, and in respective position different wave length passage in not same district
Domain forms dispersion bar, 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 cause that the wavelength channel diffraction light in the region is deflected along preset direction, realize different inputs
Again the sensing of the different wave length passage optical signal of port；
5)+1 order diffraction light and -1 order diffraction light is 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, make the difference of different input ports on corresponding region
After wavelength channel optical signal sequentially passes through the second Fourier transform optical lens, body grating and the first Fourier transform optical lens
The appointed output terminal reached on optical fibre collimator array is salty newly as collimated light.
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| 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 |
| 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 |
| 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 |
| CN110658585B (en) | 2018-06-29 | 2022-01-11 | 华为技术有限公司 | Optical waveguide device |
| 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 |
| 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 |
| CN114185135B (en) * | 2021-12-10 | 2023-10-20 | 中央民族大学 | Implementation method of folding type MXN port wavelength selective switch |
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