CN2611937Y - 40X40 wavelength non-blocking optical switch - Google Patents
40X40 wavelength non-blocking optical switch Download PDFInfo
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- CN2611937Y CN2611937Y CN 03230264 CN03230264U CN2611937Y CN 2611937 Y CN2611937 Y CN 2611937Y CN 03230264 CN03230264 CN 03230264 CN 03230264 U CN03230264 U CN 03230264U CN 2611937 Y CN2611937 Y CN 2611937Y
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Abstract
The utility model relates to a non-clogging switch with 40*40 wavelength, which comprises four double-doped lithium niobate crystals and four optical fiber couplers which are connected to form a wavelength router modular through signal transmission optical fibers, and an optical wave decomposing multiplexer and an electro-optical 10*4 switch matrix are integrated on every lithium niobate crystal. The utility model realizes non-clogging router exchanging of 40 wavelength channels. The utility model has the advantages of simple structure, reliable operation, freeness of environment interference, low insertion loss, and rapid response speed and the like, which is applicable to developing demands of optical networks with high capacity and speed.
Description
Technical field
The utility model belongs to optical-fibre communications field, and particularly a kind of 40 * 40 wave length non-blocking photoswitches are applicable to the full optical cross connect network of optical communication of wavelength-division multiplex and the optical switching system that light path is switched.
Background technology
Along with optical transfer network develops to high speed, jumbo direction, as the on-off element of system node core devices, the quality of its performance becomes the key of decision joint behavior and network performance.No matter be the structure of network, or the recovery under the network failure, all need the Based Intelligent Control of photoswitch.High capacity, high speed exchange, transparent, low-loss photoswitch will play even more important effect in development of optical network.
Formerly technology [1] is (referring to JOURNAL OF LIGHTWAVE TECHNOLOGY, Vol.16, No.4, APRIL 1998, P650-655) propose a kind of waveguide type multichannel wavelength selecting optical switch, it is integrated in an array waveguide grating coupling mechanism and four thermo-optical switchs on the same silicon chip.Array waveguide grating (AWG) complex manufacturing technology, it is bigger to insert loss ratio, and the length of waveguide is subjected to the influence of ambient temperature easily.
Formerly technology [2] (referring to JOURNAL OF LIGHTWAVE TECHNOLOGY, Vol.16, No.8, AUGUST 1998, P1473-1481) propose a kind of free space multi-channel optical switch, are made of liquid crystal light modulator array and some birefringece crystal cascades.This photoswitch is higher to the requirement on machining accuracy of birefringece crystal, and the integrated level of photoswitch is not high, has limited to extensive direction and has developed.
Summary of the invention
Problem to be solved in the utility model is to overcome the deficiency of prior art, proposes a kind of 40 * 40 wave length non-blocking photoswitches based on lithium columbate crystal wavelength routing module, is used to realize the clog-free route switching of 40 wavelength channels.Have simple in structure, modern design, reliable, advantage such as stability is high, is not subjected to environmental interference, and loss is low, and response speed is fast.Be suitable for the needs of high capacity, high-speed optical switching network development.
The utility model 40 * 40 wave length non-blocking photoswitches 101 are realized by following technical solution: photoswitch 101 comprises four signal input ports, imports wavelength-division multiplex (WDM) light signal I respectively
1-I
4, four signal output ports are exported wdm optical signal O respectively
1-O
4Photoswitch 101 also comprises four lithium columbate crystals (LN) 102-105, four 4 * 1 fiber coupler 106-109, and they become a wavelength routing module by the signal transmission fiber cross connection, are used to realize that the wavelength between the different light signals exchanges route; Crystal 102-105 has gone up a light wave decomposition multiplex device (DMUX) and one 10 * 4 electrooptical switching matrix (EOSM) integrated respectively; Each Wave decomposing multiplexer is made of 10 body gratings (HG) that are integrated on the lithium columbate crystal, utilizes the bragg wavelength selectivity characteristic of body grating to realize the demultiplexing of WDM signal; 10 * 4 electrooptical switching matrixes are made of 40 the unit electrooptical switchinges (cell) that are integrated on the lithium columbate crystal, utilize the selection and the grouping of the signal switching characteristic realization understanding multiplexing optical signal of unit electrooptical switching; The unit electrooptical switching is made of at the lip-deep electrode pair of lithium columbate crystal and body grating two parts of being recorded in the crystal evaporation, utilizes the Bragg diffraction characteristic of the cross electro-optical effect of lithium columbate crystal and body grating to realize switching to light signal; Utilize the light of lithium columbate crystal to sell off characteristic and write down body grating in crystal, recording light and read output signal light and diffraction light thereof satisfy the Bragg diffraction condition of body grating simultaneously.
Description of drawings:
Fig. 1 provides the general structure synoptic diagram of 40 * 40 wave length non-blocking photoswitches 101.
Fig. 2 provides the course of work synoptic diagram of 40 * 40 wave length non-blocking photoswitches 101.
Fig. 3 provides the fundamental diagram of light wave decomposition multiplex device (DMUX-1) 110.
Fig. 4 provides the course of work synoptic diagram of electrooptical switching matrix EOSM-1 (114).
Fig. 5 provides the principle of work synoptic diagram of unit electrooptical switching cell.
Embodiment
Below in conjunction with accompanying drawing, describe the embodiment of the utility model device in detail.
Fig. 1 is the general structure synoptic diagram of 40 * 40 wave length non-blocking photoswitches 101.As shown in Figure 1, the utility model 40 * 40 wave length non-blocking photoswitches 101 comprise 4 input wavelength-division multiplex (WDM) light signal (I
1-I
4) and wavelength-division multiplex (WDM) light signal (O of four outputs
1-O
4).Each input wdm optical signal I
m(m=1,2,3,4) carry the channel (I of 10 wavelength multiplexings
M1, I
M2..., I
M10), light signal I wherein
Mn(n=1,2 ..., 10) wavelength be λ
nThe wdm optical signal O of each output
h(h=1,2,3,4) also carry the channel (O of 10 wavelength multiplexings
H1, O
H2..., O
H10), light signal O wherein
Hn(n=1,2 ..., 10) wavelength be λ
nWave length non-blocking photoswitch 101 also comprises rectangular parallelepiped lithium columbate crystal (LN) 102-105 that four block specifications are identical, respectively integrated a light wave decomposition multiplex device (DMUX) and one 10 * 4 electrooptical switching matrix (EOSM) on the every crystal; Crystal 102-105 all comprises a signal input port and four signal output ports, its input, output signal respectively by optical fiber lens (FL) import with corresponding signal, output optical fibre links to each other.Photoswitch 101 also comprises four 4 * 1 fiber couplers (FCP) 106-109.Said lithium columbate crystal 102-105 and 4 * 1 fiber coupler 106-109 get up by the signal transmission fiber cross connection, constitute a wavelength routing module, thereby have realized the route switching between the wavelength light signal.40 * 40 wave length non-blocking photoswitches 101 can be any one input optical signal I
Mn(m=1,2,3,4; N=1,2 ..., 10) be sent to one of 101 4 signal output ports of photoswitch.For fear of conflict, appoint to be sent in the same signal output port and go, thereby the utility model device has the wave length non-blocking characteristic with two input optical signals with identical wavelength.
Fig. 2 has provided the course of work synoptic diagram of 40 * 40 wave length non-blocking photoswitches 101.As shown in Figure 2, four light wave decomposition multiplex devices (DMUX) 110-113, four 10 * 4 electrooptical switching matrix (EOSM) 114-117 and four fiber couplers (FC) 106-109 get up by the signal transmission fiber cross connection, constitute a wavelength routing module; 4 input wdm optical signal I
1-I
4Become the wdm optical signal O of four outputs after exchanging by the wavelength routing module
1-O
4Light wave decomposition multiplex device DMUX-m and electrooptical switching matrix EOSM-m are integrated on the same lithium columbate crystal LN-m in the wavelength routing module, m=1 wherein, 2,3,4.The course of work of wavelength routing module is as follows: from the wdm optical signal I of the signal input port of photoswitch 101 input
m(m=1,2,3,4) at first pass through light wave decomposition multiplex device DMUX-m demultiplexing, 10 single wavelength light signal I behind the demultiplexing
M1-I
M10Directly enter into electrooptical switching matrix EOSM-m along different transmission light paths respectively; By the state of control electrooptical switching matrix EOSM-m, can be to 10 demultiplexing list wavelength light signal I of input
M1-I
M10Carry out the wavelength Route Selection and be reassembled into four multi-channel optical signal G
M1-G
M4, light signal G
M1-G
M4Four signal output ports from electrooptical switching matrix EOSM-m enter corresponding signal transmission fiber respectively; Multi-channel optical signal G
M1-G
M4Be sent among the fiber coupler FCP-1-FCP-4 by corresponding signal transmission fiber respectively, each fiber coupler FCP-h (h=1,2,3,4) receives from four next multi-channel optical signal G of electrooptical switching matrix 114-117 transmission
1h-G
4hAnd they are multiplexed with wdm optical signal O again
hThe output of (h=1,2,3,4) back, O
hCarry the channel (O of 10 wavelength multiplexings
H1, O
H2..., O
H10) and the wavelength of the light signal of each channel have nothing in common with each other light signal O wherein
Hn(n=1,2 ..., 10) wavelength be λ
n
Like this by lithium columbate crystal 102-105 and fiber coupler 106-109 by the wavelength routing module that the signal transmission fiber cross connection constitutes, can realize the demultiplexing of wdm optical signal, and can select, divide into groups and reconfigure light signal according to designing requirement.By this wavelength routing module, realized the wavelength route switching of 40 channels, input end can be with any one input optical signal I
MnOutput to any one output terminal, thereby realized having 40 * 40 smooth alteration switches 101 of wave length non-blocking characteristic.The utility model device relatively simple for structure, exchange has dirigibility to wavelength for it.Because do not have movable part, thereby its reliability is higher, anti-environmental interference is strong, the insertion loss is low.
Fig. 3 has provided the fundamental diagram of light wave decomposition multiplex device (DMUX-1) 110.Be integrated in the light wave decomposition multiplex device DMUX-m on the lithium columbate crystal LN-m (m=1,2,3,4), its wavelength (de) multiplexing function is to realize by the wavelength selection effect that is recorded in the volume holographic grating on the crystal.DMUX-1 illustrates below in conjunction with light wave decomposition multiplex device.As shown in Figure 3, the orientation of regulation optical axis of crystal c is along coordinate z direction, and the transmission direction of wdm optical signal is along coordinate y direction, and the light field direction of vibration is parallel to coordinate x direction.10 volume holographic grating HG in lithium columbate crystal LN-1, have been write down
1-HG
10, they are equidistantly arranged and are positioned on the same straight line that is parallel to coordinate y direction; Volume holographic grating HG
i(i=1,2 ..., 10) to flashlight I along coordinate y direction is propagated, direction of vibration is parallel to coordinate x direction
1iProduce diffraction, the diffraction light wave is constant along the optical axis direction propagation and the direction of vibration of crystal; Body grating HG
iTo the flashlight that does not meet above-mentioned condition then is transparent.Because incoming signal light I
1i(i=1,2 ..., 10) and diffraction light all be ordinary polarized light, thereby their wave vector size is identical, direction is vertical mutually, according to the Bragg diffraction condition, body grating HG
iWave vector point to coordinate (0,1,1) direction; Because flashlight I
11-I
110Wavelength have nothing in common with each other so body grating HG
1-HG
10Wave vector vary in size, but difference is little each other.The course of work of light wave decomposition multiplex device (DMUX-1) 110 is as follows: wdm optical signal I
1Enter in the Wave decomposing multiplexer 110 along coordinate y direction, arrive body grating HG
1The time light signal I
11Diffracted, the diffraction light wave is propagated along the optical axis direction of crystal, thereby separates from the multi-wavelength signals light wave; Because body grating HG
1Flashlight to other is transparent, thereby remaining light signal I
12-I
110Directly by grating HG
1Continue to propagate; In like manner, body grating HG
2-HG
10Respectively to light signal I
12-I
110Produce diffraction, make them in turn from wdm optical signal I
1In separate; 10 single wavelength light signal I that separate
11-I
110Propagate along the different light paths that is parallel to optical axis of crystal direction respectively, enter at last and be integrated in the same electrooptical switching matrix on the lithium columbate crystal.
Like this, utilize the wavelength selection effect of the some body gratings be recorded in diverse location place in the lithium columbate crystal, can resolve into the single wavelength light signal that separates on each other in the space to wdm optical signal, thereby realized the demultiplexing of wdm optical signal.The record body grating has lower insertion loss to the light signal of transmission.
Fig. 4 has provided the course of work synoptic diagram of electrooptical switching matrix (EOSM-1) 114.Be integrated in the electrooptical switching matrix EOSM-m on the lithium columbate crystal LN-m (m=1,2,3,4), its wavelength is selected, block functions is to realize by the signal switching effect that is integrated in each unit electrooptical switching cell on the crystal.Illustrate below in conjunction with electrooptical switching matrix (EOSM-1) 114.As shown in Figure 4, the orientation of still getting optical axis of crystal c is along coordinate z direction, single wave optical signal I of incident
1i(i=1,2 ..., 10) be parallel to optical axis of crystal direction and propagate.Integrated 40 unit electrooptical switching cell in lithium columbate crystal LN-1, they line up one 10 row 4 row electrooptical switching matrix EOSM-1 (its surface structure is as shown in Figure 1), and the row and column of matrix is parallel to the optical axis of crystal and coordinate y direction respectively.Be positioned at electrooptical switching matrix i (i=1,2 ..., 10) 26S Proteasome Structure and Function of four unit electrooptical switchinges on the row is identical, all can be to single wave optical signal I
1iSelect, switch; Be positioned at the i that electrooptical switching matrix any lists (i=1,2 ..., 10) individual unit electrooptical switching can be to single wave optical signal I
1iSelecting, switch, then is transparent to any light signal along the transmission of coordinate y direction.The wavelength of electrooptical switching matrix EOSM-1 is selected with grouping process as follows: light signal I
1i(i=1,2 ..., 10) to enter the i of electrooptical switching matrix 114 along the light path that is parallel to the optical axis of crystal capable, and select, switch by being positioned at one of four unit electrooptical switchinges on this row; Light signal I
1iWhen arriving capable first unit electrooptical switching of i, select if desired, the unit electrooptical switching just switches to the transmission of coordinate y direction to it, if do not need to select, and light signal I then
1iDirectly enter the next unit electrooptical switching of this row by first unit electrooptical switching, the rest may be inferred; According to designing requirement, at electrooptical switching matrix 114 j (j=1,2,3,4) having listed several unit electrooptical switching cell selects and switches corresponding light signal, selecteed some light signals are propagated along the same light path that is parallel to coordinate y direction in these row, finally are combined into a multi-channel optical signal G at j output port place of electrooptical switching matrix 114
1j(j=1,2,3,4); The demultiplexing list wavelength light signal I of 10 inputs
11-I
110After selecting, divide into groups, be combined into four multi-channel optical signal G through electrooptical switching matrix EOSM-1
11-G
14
Like this, utilize the signal switching effect that is integrated in the some unit electrooptical switching cell on the lithium columbate crystal, realized that each the multi-channel optical signal after reconfiguring comprises several single wavelength light signals to the selection and the grouping of a plurality of single wavelength light signal of input.
Fig. 5 has provided the principle of work synoptic diagram of unit electrooptical switching cell.Being integrated in the unit electrooptical switching on the lithium columbate crystal LN-m (m=1,2,3,4), is to utilize the cross electro-optical effect of lithium columbate crystal and the Bragg diffraction characteristic of body grating to realize its signal handoff functionality.As shown in Figure 5, the optical axis c that still gets crystal is parallel to coordinate z direction.Unit electrooptical switching cell comprises evaporation at the lip-deep electrode pair 118 of lithium columbate crystal and body grating 119 two parts that are recorded in the lithium columbate crystal.Electrode pair 118 is added on two opposite flanks that lithium columbate crystal is parallel to coordinate surface yz, in order to lithium columbate crystal is applied horizontal half-wave voltage along the x direction symmetrically; 119 pairs of body gratings are λ along the propagation of optical axis of crystal direction, wavelength
n(n=1,2 ..., 10) and the light wave direction of vibration be parallel to the light signal generating diffraction of coordinate y direction, the diffraction light wave is propagated and the light wave direction of vibration is parallel to optical axis along coordinate y direction; The flashlight that 119 pairs of body gratings do not meet above-mentioned condition then is transparent.Because incoming signal light I
Mn(m=1,2,3,4; N=1,2 ..., 10) be that ordinary polarized light and the flashlight of diffraction are unusual polarized lights, thereby the two wave vector size difference and direction is vertical mutually slightly, according to the Bragg diffraction condition of body grating, the wave vector of body grating 119 is pointed to and is departed from the direction of coordinate (0,1 ,-1) a little; Be arranged in the body grating of electrooptical switching matrix EOSM-m with each unit electrooptical switching in the delegation, the spatial orientation of its wave vector is all identical with size; Be arranged in the body grating of same each unit electrooptical switching that lists of electrooptical switching matrix EOSM-m, the spatial orientation of its grating wave vector and size have nothing in common with each other but difference is little each other.The electrooptical deflection process of unit electrooptical switching cell is as follows: wavelength is λ
n(n=1,2 ..., 10), direction of vibration is parallel to the flashlight I of coordinate x direction
MnEnter unit electrooptical switching cell along optical axis of crystal direction, if electrode pair 118 does not add horizontal half-wave voltage, light signal I then
MnDirection of vibration is constant when arriving body grating 119, thereby directly continues along the transmission of optical axis of crystal direction by grating, and note is made I
Mn(o), the pass-through state of this corresponding unit electrooptical switching; If 118 pairs of lithium columbate crystals of electrode pair add horizontal half-wave voltage, owing to the cross electro-optical effect of lithium columbate crystal makes its induction main shaft around having rotated 45 °, light signal I
MnDirection of vibration becomes and is parallel to coordinate y direction, 119 couples of light signal I of body grating this moment when arriving body grating 119
MnProduce diffraction, the flashlight behind the diffraction is propagated and direction of vibration is parallel to the optical axis of crystal along coordinate y direction, and note is made I
Mn(e), the switching state of this corresponding unit electrooptical switching.
As seen, utilize the Bragg diffraction characteristic of the cross electro-optical effect of lithium columbate crystal and body grating to realize the signal switching effect of electrooptical switching unit, unit cell.The unit electrooptical switching has the exchange velocity and the low loss characteristic of nanosecond, and its volume is less, is integrated into large-scale electrooptical switching matrix easily on a large scale.Therefore be adapted to the demand of high speed, the development of high capacity optical transfer network.
The specific embodiment of the utility model device
Crystal 102-105 is the LiNbO3 through high temperature oxidation process: Fe: Mn or LiNbO3: Ce: Cu monocrystalline, crystal are processed into the rectangular parallelepiped of length and width, the thick 60mm of being respectively, 42mm and 1mm; The specification of four crystal is identical, and their direction of optic axis all alongst; The all surface of crystal 102-105 has all carried out optical polish.
The specification of unit electrooptical switching (cell) is 10 * 2 * 1mm
3, wherein the length of electrode evaporation, width are respectively 5mm, 2mm; 40 unit electrooptical switchinges are arranged in one 10 * 4 electrooptical switching matrix EOSM on lithium columbate crystal, the spacing between adjacent two row of matrix is 2mm, and the spacing between adjacent two row also is 2mm, and the specification of electrooptical switching matrix EOSM is 50 * 42 * 1mm
3
The specification of light wave decomposition multiplex device (DMUX) is 10 * 42 * 1mm
3, wherein Ji Lu each body grating is equidistantly arranged, i (i=1,2 ... 10) individual body grating HG
iBe positioned at collection on the i of the electrooptical switching matrix (EOSM) on the same lithium columbate crystal is capable.
In double doping lithium niobate crystal 102-105, write down volume holographic grating, all adopt the fixing non-volatile holographic recording method of two center light.With wavelength be the ruddiness of 632.8nm as recording light, the ultraviolet light that with wavelength is 365nm is as sensitization light.Because the flashlight of optical communication wave band is insensitive to lithium columbate crystal, thereby can produce during by optical grating diffraction and wipe body grating.Satisfy Prague matching condition of body grating between the wave vector of wave vector, flashlight and the diffraction light thereof of the wave vector of body grating, the two ruddiness of record simultaneously.
Claims (2)
1, a kind of 40 * 40 wave length non-blocking photoswitches (101) comprise four signal input port (I
1-I
4), four signal output port (O
1-O
4); It is characterized in that identical lithium columbate crystal of four block specifications (102-105) and four 4 * 1 fiber couplers (106-109), they become a wavelength routing module by the signal transmission fiber cross connection; Each piece crystal (102-105) has gone up a light wave decomposition multiplex device (DMUX) and one 10 * 4 electrooptical switching matrix (EOSM) integrated respectively; Each Wave decomposing multiplexer (DMUX) is made of 10 body gratings (HG) that are integrated on the lithium columbate crystal; 10 * 4 electrooptical switching matrixes are made of 40 unit electrooptical switchinges that are integrated on the lithium columbate crystal, all comprise a signal input port (I on each piece crystal (102-105)
1-I
4) and four output port (O
1-O
4), its input/output signal respectively by optical fiber lens (FL) import with corresponding signal, output optical fibre links to each other.
2,40 * 40 wave length non-blocking photoswitches according to claim 1 is characterized in that described unit electrooptical switching is made of at the lip-deep electrode pair of lithium columbate crystal and body grating (HG) two parts that are recorded in the crystal evaporation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03230264 CN2611937Y (en) | 2003-04-11 | 2003-04-11 | 40X40 wavelength non-blocking optical switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03230264 CN2611937Y (en) | 2003-04-11 | 2003-04-11 | 40X40 wavelength non-blocking optical switch |
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| Publication Number | Publication Date |
|---|---|
| CN2611937Y true CN2611937Y (en) | 2004-04-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03230264 Expired - Fee Related CN2611937Y (en) | 2003-04-11 | 2003-04-11 | 40X40 wavelength non-blocking optical switch |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104662820A (en) * | 2012-07-13 | 2015-05-27 | 雷神公司 | High-bandwidth optical communications relay architecture |
| WO2016106654A1 (en) * | 2014-12-31 | 2016-07-07 | 华为技术有限公司 | Route configuration method and device for pic type of optical switch matrix |
| CN113885130A (en) * | 2020-07-03 | 2022-01-04 | 华为技术有限公司 | Optical waveguide structure, optical waveguide module, optical switching apparatus, optical switching system, and method of manufacturing optical waveguide structure |
-
2003
- 2003-04-11 CN CN 03230264 patent/CN2611937Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104662820A (en) * | 2012-07-13 | 2015-05-27 | 雷神公司 | High-bandwidth optical communications relay architecture |
| WO2016106654A1 (en) * | 2014-12-31 | 2016-07-07 | 华为技术有限公司 | Route configuration method and device for pic type of optical switch matrix |
| CN113885130A (en) * | 2020-07-03 | 2022-01-04 | 华为技术有限公司 | Optical waveguide structure, optical waveguide module, optical switching apparatus, optical switching system, and method of manufacturing optical waveguide structure |
| CN113885130B (en) * | 2020-07-03 | 2023-02-03 | 华为技术有限公司 | Optical waveguide structure, optical waveguide module, optical switching apparatus, optical switching system, and method of manufacturing optical waveguide structure |
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| CF01 | Termination of patent right due to non-payment of annual fee |