WO2006089452A1 - Équipement et système de protection de couche optique de matrice de commutation et système de transmission wdm correspondant - Google Patents

Équipement et système de protection de couche optique de matrice de commutation et système de transmission wdm correspondant Download PDF

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Publication number
WO2006089452A1
WO2006089452A1 PCT/CN2005/000206 CN2005000206W WO2006089452A1 WO 2006089452 A1 WO2006089452 A1 WO 2006089452A1 CN 2005000206 W CN2005000206 W CN 2005000206W WO 2006089452 A1 WO2006089452 A1 WO 2006089452A1
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WO
WIPO (PCT)
Prior art keywords
optical
layer protection
switch matrix
switch
optical layer
Prior art date
Application number
PCT/CN2005/000206
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English (en)
Chinese (zh)
Inventor
Baozhong Chen
Original Assignee
Zte Corporation
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Zte Corporation filed Critical Zte Corporation
Priority to PCT/CN2005/000206 priority Critical patent/WO2006089452A1/fr
Publication of WO2006089452A1 publication Critical patent/WO2006089452A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0287—Protection in WDM systems
    • H04J14/0293—Optical channel protection
    • H04J14/0295—Shared protection at the optical channel (1:1, n:m)
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0024—Construction using space switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability

Definitions

  • the invention relates to the protection of the optical forwarding unit OTU and related services in the field of WDM wavelength division multiplexing optical fiber communication, in particular to a device for realizing WDM l:n and m:n optical layer protection by using a 2x2 optical switch cascade matrix
  • the WDM transmission system of the device is a device for realizing WDM l:n and m:n optical layer protection by using a 2x2 optical switch cascade matrix
  • WDM wavelength division multiplexing technology is to transmit multiple signals simultaneously in a single fiber through sparse or densely spaced multiple specific wavelengths, which can double the single fiber transmission capacity.
  • the WDM wavelength division multiplexing device there are a large number of optical forwarding units OTU.
  • the OTUs respectively convert the non-specific wavelength optical signals carrying the customer service into specific wavelength optical signals at the transmitting end, and after being combined and amplified, they enter the optical fiber transmission, and are repeatedly amplified and transmitted through the optical transmission, and finally reach the receiving end and then amplified. After splitting, the OTU converts the specific wavelength optical signal into a non-specific wavelength optical signal and sends it to the client device.
  • the WDM system reserves a number (for example, m) of wavelength channels in addition to a certain number (for example, n) of wavelength channels as working channels.
  • a backup protection channel If a working channel fails, the traffic carried in the channel is switched to the alternate protection channel.
  • m n channel protection.
  • l n channel protection.
  • the technical problem to be solved by the present invention is to provide a low-cost, highly reliable, and scalable WDM.
  • the present invention provides a switch matrix optical layer protection device, which includes a plurality of 2x2 optical switches sequentially connected in a cascade manner, the 2x2 optical switch having a first input end and a second input end a first output end and a second output end, wherein a second output end of the 2x2 optical switch is a second independent output end, and a second input end is connected to a second output end of another 2x2 optical switch
  • the first output end of the 2x2 optical switch is a first independent output end;
  • the optical switch includes a through state and an intersecting state, and when the optical switch is in a through state, a signal input by the first input terminal is output from the first output end, When the optical switch is in the crossed state, the signal input by the first input terminal is output from the second output terminal.
  • the above-mentioned switch matrix optical layer protection device further includes a plurality of optical forwarding units, and the optical forwarding unit is connected to the independent output terminals in one-to-one correspondence.
  • the present invention further provides a switch matrix optical layer protection system, comprising: a plurality of switch matrix optical layer protection devices sequentially connected, wherein the optical switch of the switch matrix optical layer protection device
  • the first independent output is connected in one-to-one correspondence with the first input end of the optical switch in the other switch matrix optical layer protection device, the second independent output end of the switch matrix optical layer protection device and one of the switch matrix optical layer protection devices
  • the first independent output is a third independent output.
  • the above-mentioned switch matrix optical layer protection system further includes a plurality of optical forwarding units, and the optical forwarding unit is connected to the third independent output end in one-to-one correspondence.
  • the optical switch is integrally manufactured by using a MEMS process, an array waveguide process or a liquid crystal process.
  • the present invention further provides a WDM transmission system using the switch matrix optical layer protection device, including an optical multiplexer, an optical demultiplexer, connecting the optical multiplexer, and optical demultiplexing.
  • the optical fiber of the device wherein the transmission terminal switch matrix light with the transmitting end optical forwarding unit is further included a layer protection device, a receiving end switch matrix optical layer protection device with a receiving end optical forwarding unit, wherein the transmitting end switch matrix optical layer protection device is connected to the optical multiplexer through the transmitting end optical forwarding unit, the receiving end The switch matrix optical layer protection device is connected to the optical demultiplexer through the receiving end optical forwarding unit.
  • the present invention also provides a WDM transmission system using a switch matrix optical layer protection system, including an optical multiplexer, an optical demultiplexer, and the optical multiplexer and optical demultiplexer.
  • the optical fiber further comprising a transmitting end switch matrix optical layer protection system with a transmitting end optical forwarding unit and a receiving end switch matrix optical layer protection system with a receiving end optical forwarding unit, the transmitting end switch matrix optical layer protection system
  • the optical multiplexer is connected by the transmitting end optical forwarding unit, and the receiving end switch matrix optical layer protection system is connected to the optical demultiplexer through the receiving end optical forwarding unit.
  • the present invention uses n 2x2 optical switches to form a protection switch matrix as the core. After ingenious combination, the above-mentioned methods can respectively realize l:n and m:n channel protection of different scales, and can realize additional service transmission. Compared with the prior art, system cost and complexity are reduced, and system reliability and flexibility are improved.
  • Figure 1 is a switch matrix optical layer protection device consisting of n 2x2 optical switches
  • FIG. 2 is a schematic diagram of WDM 1 : n optical layer protection using a 2x2 optical switch cascade;
  • FIG. 3 is a schematic diagram of WDM 1 : mn optical layer protection using 2x2 optical switch cascade;
  • Figure 4 is a schematic diagram of WDM m: n optical layer protection using 2x2 optical switch cascade;
  • Figure 5 is a protection switch matrix device consisting of 8 2x2 optical switches
  • FIG. 6 is a schematic diagram of WDM 1:8 optical layer protection implemented by cascading 2x2 optical switches;
  • Figure 7 is a schematic diagram of WDM 1:16 optical layer protection using 2x2 optical switch cascading
  • Figure 8 is a schematic diagram of WDM 2:8 optical layer protection using 2x2 optical switch cascading.
  • the n 2x2 optical switches 001, 002, 003 ... 004 of the switch matrix optical layer protection device have two states of through and cross, and all 2x2 optical switches 001, 002, 003... 004 are Including a first input terminal 1, a second input terminal 4, a first output terminal 3, and a second output terminal 2, the light is turned on The second input terminal 4 is connected to the second output terminal 2 of the latter optical switch.
  • the input terminal 1 and the output terminal 3 are in communication
  • the input terminal 4 and the output terminal 2 are in communication
  • the input is Terminal 1 and output 2 are in communication
  • input 4 and output 3 are in communication.
  • the WDM l:n optical layer protection is implemented by using the above switch matrix optical layer protection device, as shown in FIG. 2, and includes the following parts:
  • the transmitting end switch matrix optical layer protection device 100 having the structure of FIG. 1 , n+1 transmitting optical forwarding Units OTUs 110, 111, 112 ... 113, one-to-one correspondingly connected n+1 independent outputs, WDM transmission system 120 including optical multiplexer, optical demultiplexing optical amplification, optical fiber line, etc., n+1 Receiver optical forwarding units OTUs 130, 131, 132 ... 133 and receiver switching matrix optical layer protection means 140 having the structure of FIG.
  • the working process of the device is as follows: When the system is normal, both the transmitting end and the receiving end switch matrix optical layer protection devices are in working state. Thus, the service 1 is transmitted through the wavelength channel 1 formed by the transmitting end switch matrix optical layer protection device 100, the transmitting end OTU1 lll, the WDM transmission system 120, the receiving end OTU1 131, and the receiving end protection switch matrix 140; The optical layer protection device 100, the transmitting end OTU2 112, the WDM transmission system 120, the receiving end OTU2 132, and the receiving end protection switch matrix 140 form a wavelength channel 2 transmission; and so on, the service n is transmitted through the transmitting end switch matrix optical layer protection device 100.
  • the transmitting end OTUn ll3, the WDM transmission system 120, the receiving end OTUn l33, and the receiving end switch matrix optical layer protection device 140 form a wavelength channel n transmission.
  • the extra service 0 is transmitted through the wavelength channel 0 formed by the transmitting end switch matrix optical layer protection device 10CX transmitting end OTU0 110, the WDM transmission system 120, the receiving end OTU0 130, and the receiving end switch matrix optical layer protection device 140. .
  • the switch matrix optical layer protection device of the transmitting end and the receiving end is switched from the working state to the protection state, and the service i Transmitted from wavelength channel i to wavelength channel 0 transmission, thus achieving 1:n channel protection.
  • the 2#2 ⁇ 2 optical switch 102 in the transmitting switch matrix optical layer protection device 100 is switched from a through state to a cross state; then, the receiving end switch matrix optical layer protection device
  • the 2#2x2 optical switch 142 in 140 is also switched from the through state to the cross state; thus, the service 2 is changed to the transmitting end 2#2x2 optical switch 102, the transmitting end 1#2 ⁇ 2 optical switch 101, the transmitting end OTU0 110, WDM
  • the transmission channel 120, the receiving end OTU0 130, the receiving end 1#2 ⁇ 2 optical switch 141, and the receiving end 2#2 ⁇ 2 optical switch 142 form a wavelength channel 0 transmission, thereby achieving 1:n channel protection.
  • Serial or parallel expansion with the protection switch matrix 000 in Figure 1 as a basic unit can achieve larger scale 1 : ⁇ or m: n channel protection, respectively.
  • the m transmitting end and the receiving end switch matrix optical layer protection devices are respectively connected in series, and the shared wavelength channel 0 can provide protection for the wavelength channel 1 to the wavelength channel mil, thereby realizing larger scale l :n channel protection. .
  • the m transmitting end and the receiving end switch matrix optical layer protection devices are respectively connected in parallel to form a switch matrix optical layer protection system, including m+n independent output ends, and the m wavelength channels can be shared as the wavelength channel 1 ⁇
  • the wavelength channel n provides protection for m : n channel protection.
  • the first output end of the optical switch in the switch matrix optical layer protection device is connected in one-to-one correspondence with the first input end of the optical switch in the latter switch matrix optical layer protection device, such as the first optical switch in the switch matrix optical layer protection device 402
  • the output end is connected in one-to-one correspondence with the first input end of the optical switch in the latter switch matrix optical layer protection device 403.
  • the finally formed switch matrix optical layer protection system includes m+n third independent output terminals, including the last switch matrix.
  • the m+n optical forwarding units are respectively connected to the independent output terminals.
  • the working process of the m:n channel protection of the device is as follows:
  • the switch matrix optical layer protection system including a plurality of switch matrix optical layer protection devices 401, 402, . . . 403, the transmitting end OTU1 411, the WDM transmission system 420, the receiving end OTU1 43 1, and the receiving end switch.
  • the wavelength channel 1 consists of the matrix optical layer protection system (441, 442, 443); the service 2 is transmitted through the switch matrix optical layer protection system (401, 402, 403), the transmitting end OTU2 412, the WDM transmission system 420, and the receiving end.
  • OTU2 432, receiving switch matrix optical layer protection system (441, 442, 443) constitutes the wavelength channel 2 transmission; and so on, the service n is transmitted through the transmitting switch matrix optical layer protection system (401, 402, 403), the transmitting end OTUn 413, the WDM transmission system 420, the receiving end OTUn 433, receiving
  • the wavelength channel ri is formed by the end switch matrix optical layer protection system (441, 442, 443).
  • the additional service 1 is transmitted through the wavelength channel formed by the transmitting switch matrix optical layer protection device 401, the transmitting end OTUpl 414, the WDM transmission system 420, the receiving end OTUpl 434, and the receiving end switch matrix optical layer protection device 443;
  • the additional service 2 is transmitted through the wavelength channel formed by the transmitting switch matrix optical layer protection device 402, the transmitting end OTUp2 415, the WDM transmission system 420, the receiving end OTUp2 435, and the receiving end switch matrix optical layer protection device 442; and so on, additional services
  • the m is transmitted through the wavelength channel formed by the transmitting switch matrix optical layer protection device 403, the transmitting end OTUpm 416, the WDM transmission system 420, the receiving end OTUpm 436, and the receiving end switch matrix optical layer protection device 441.
  • the system can continue to transmit the service 1 in any one of the m guard wavelength channels. For example, if the protection wavelength 1 transmission is selected, the 2x2 optical switch in the transmission switch matrix optical layer protection device 401 is switched from the through state to the cross state, and the 1#2 ⁇ 2 optical switch in the receiving switch matrix optical layer protection device 443 is also directly connected. The state is switched to the cross state.
  • the service 1 is changed to the protected wavelength channel pi formed by the transmitting switch matrix optical layer protection device 401, the transmitting terminal OTUpl 414, the WDM transmission system 420, the receiving terminal OTUpl 434, and the receiving switch matrix optical layer protection device 443.
  • the system can continue to transmit service 2 in any of the remaining m-1 guard wavelength channels. For example, if the protection wavelength 2 transmission is selected, the 2#2x2 optical switch in the transmission switch matrix optical layer protection device 402 is switched from the through state to the cross state, and the 2#2x2 optical switch in the receiving end switch matrix optical layer protection device 442 is also It is switched from a through state to a cross state.
  • the service 2 is changed to the transmitting switch matrix optical layer protection system (401, 402), the transmitting end OTUp2 415, the WDM transmission system 420, the receiving end OTUpl 435, and the receiving end switch matrix optical layer protection system (442, 443).
  • Protected wavelength channel P2 transmission By analogy, the protection of up to m services can be achieved by the above method.
  • the cross matrix formed by the 2x2 optical switch cascade used in the present invention can be constructed by a discrete 2x2 optical switch, or can be realized by an integrated optical switch manufactured by MEMS, array waveguide, and liquid crystal process.
  • the internal structure of the switch matrix optical layer protection device (500) consisting of eight 2x2 optical switch cascades is shown in Figure 5:
  • the switch matrix optical layer protection device has 2x2 optical switches 001, 002, 003 ... 004, which have two states of through and cross.
  • the input terminal 1 and the output terminal 3 are in communication
  • the input terminal 4 and the output are The terminal 2 is in communication
  • the cross state the input terminal 1 and the output terminal 2 are in communication
  • the input terminal 4 and the output terminal 3 are in communication.
  • the switch matrix optical layer protection device at work status.
  • the above-mentioned switch matrix optical layer protection device is used to realize WDM 1:8 optical layer protection consisting of the following parts:
  • the transmitting end protection switch matrix 600 having the structure of FIG. 5, the nine transmitting end optical forwarding units OTU 610, 611, 612 ... 613, WDM transmission system 620 including optical multiplexer, optical demultiplexer, optical amplification, optical fiber line, etc., 9 receiving optical forwarding units OTU 630, 631, 632 ... 633 and having the structure of FIG.
  • the receiving end switches the matrix optical layer protection device 640.
  • the service 1 is transmitted through the wavelength channel 1 formed by the transmitting switch matrix optical layer protection device 600, the transmitting end OTU1 611, the WDM transmission system 620, the receiving end OTU1 631, and the receiving end switch matrix optical layer protection device 640;
  • the end channel matrix optical layer protection device 600, the transmitting end OTU2 612, the WDM transmission system 620, the receiving end OTU2 632, and the receiving end switch matrix optical layer protection device 640 form a wavelength channel 2 transmission; and so on, the service 8 is transmitted through the transmitting end
  • the switch matrix optical layer protection device 600, the transmitting end OTU8 613, the WDM transmission system 620, the receiving end OTU8 633, and the receiving end switch matrix optical layer protection device 640 form a wavelength channel 8 transmission.
  • the extra service 0 is transmitted through the wavelength channel 0 formed by the transmitting end switch matrix optical layer protection device 6 ⁇ , the transmitting end OTU0 610, the WDM transmission system 620, the receiving end OTU0 630, and the receiving end switch matrix optical layer protection device 640.
  • the switch matrix optical layer protection device at the transmitting end and the receiving end is switched from the working state to the protection state, and the service 2 is changed from the wavelength channel 2 transmission to the transmission.
  • Wavelength channel 0 is transmitted to achieve 1:8 channel protection.
  • the specific protection process is as follows: First, the 2#2x2 optical switch 602 in the transmitting end switch matrix optical layer protection device 600 is switched from the through state to the cross state; then, the 2#2x2 optical switch in the receiving end switch matrix optical layer protection device 640 642 is also switched from the through state to the cross state, so that the service 2 is changed to the transmitting end 2#2x2 optical switch 602, the transmitting end 1#2 ⁇ 2 optical switch 601, the transmitting end OTU0 610, the WDM transmission system 620, and the receiving end OTU0 630.
  • the receiving end 1#2 ⁇ 2 optical switch 641 and the receiving end 2#2x2 optical switch 642 constitute a wavelength channel 0 transmission, thereby realizing 1:8 channel protection.
  • Two transmitting end and receiving end switch matrix optical layer protection devices are respectively connected in series to share a wavelength channel
  • the two switching ends and the receiving end switch matrix optical layer protection devices are respectively connected in parallel to form a switch matrix optical layer protection system, and two wavelength channels can be shared to provide protection for the wavelength channels 1 to 8, thereby achieving 2: 8 channel protection.
  • the working process of the device to realize 2:8 channel protection is as follows: When the system is normal, the switch matrix optical layer protection system of the transmitting end and the receiving end are in working state.
  • the service 1 is configured by the transmitting end switch matrix optical layer protection system (801, 802), the transmitting end OTU1 811, the WDM transmission system 820, the receiving end OTU1 831, and the receiving end switch matrix optical layer protection system (842, 843).
  • service 2 consists of the transmitting switch matrix optical layer protection system (801, 802), the transmitting end OTU2 812, the WDM transmission system 820, the receiving end OTU2 832, and the receiving end switch matrix optical layer protection system (842, 843) Wavelength channel 2 transmission; and so on, service 8 is transmitted through the switch matrix optical layer protection system (801, 802 X transmitter OTU8 813, WDM transmission system 820, receiver OTU8 833, receiver switch matrix optical layer protection system ( 842, 843) The wavelength channel 8 is constructed for transmission.
  • the extra service 1 is sent to the switch matrix optical layer protection device 801,
  • the transmitting end OTUpl 814, the WDM transmission system 820, the receiving end OTUpl 834, and the receiving end switch matrix optical layer protection device 843 form a wavelength channel pi transmission;
  • the additional service 2 is sent through the transmitting end switch matrix optical layer protection device 802, the transmitting end OTUp2 815,
  • the wavelength channel p2 formed by the WDM transmission system 420, the receiving end OTUp2 835, and the receiving end switch matrix optical layer protection device 842 is transmitted.
  • the corresponding switch matrix optical layer protection devices at the transmitting end and the receiving end are switched from the working state to the protection state, and the services are changed from the working wavelength channel transmission to the protection wavelength channel transmission.
  • the system can select the protection wavelength channel pi to continue to transmit the service 1 . That is, the 1#2 ⁇ 2 optical switch in the transmitting end switch matrix optical layer protection device 801 is switched from the through state to the cross state, and the 1#2 ⁇ 2 optical switch in the receiving end switch matrix optical layer protection device 843 is also switched from the through state to the cross state. .
  • the service 1 is changed to the protected wavelength channel pi transmission formed by the transmitting end switch matrix optical layer protection device 801, the transmitting end OTUpl 814, the WDM transmission system 820, the receiving end OTUpl 834, and the receiving switch matrix optical layer protection device 843.
  • the system can choose to protect the wavelength channel p2 to continue to transmit traffic 2 . That is, the 2#2 ⁇ 2 optical switch in the transmitting switch matrix optical layer protection device 802 is switched from the through state to the cross state.
  • the 2#2x2 optical switch in the receiving terminal switch matrix optical layer protection device 842 is also switched from the through state to the cross state.
  • the service 2 is changed to the transmitting switch matrix optical layer protection system (801, 802), the transmitting end OTUp2 815, the WDM transmission system 820, the receiving end OTUpl 835, and the receiving end switch matrix optical layer protection system (842, 843).
  • the constructed protection wavelength channel p2 is transmitted.
  • the invention provides a device for using a 2x2 optical switch cascade protection matrix as a basic unit, which can realize WDM l:n and nr.n optical layer protection of different scales, the device has good expandability, low cost and structure. Simple, reliable, and capable of transmitting additional services.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

L’invention porte sur un équipement de protection de couche optique de matrice de commutation comprenant une connexion en cascade de commutateurs optiques multi-2 X 2, lesdits commutateurs comprenant : un premier port d’entrée, un deuxième port d’entrée, un premier port de sortie, un deuxième port de sortie, la deuxième extrémité d’entrée desdits connecteurs optiques se connectant à la deuxième extrémité de sortie du commutateur optique suivant, lesdits connecteurs optiques comportant un état traversant et un état en dérivation. Lorsque lesdits commutateurs sont en l’état traversant, l’entrée de signal entrant par le premier port d’entrée sort par le premier port de sortie ; lorsque lesdits commutateurs sont en l’état de dérivation, le signal entrant par le premier port d’entrée sort par le deuxième port. L’invention propose également une protection de couche optique de matrice de commutation et un système de transmission WDM exploitant l’équipement de protection de couche optique de matrice de commutation. L’invention permet de réaliser des équipements de protection de couche optique 1:n et m:n WDM. L’équipement est d’extension facile, économique et de configuration simple. Il présente une haute sécurité et peut transmettre des services supplémentaires.
PCT/CN2005/000206 2005-02-22 2005-02-22 Équipement et système de protection de couche optique de matrice de commutation et système de transmission wdm correspondant WO2006089452A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/CN2005/000206 WO2006089452A1 (fr) 2005-02-22 2005-02-22 Équipement et système de protection de couche optique de matrice de commutation et système de transmission wdm correspondant

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Application Number Priority Date Filing Date Title
PCT/CN2005/000206 WO2006089452A1 (fr) 2005-02-22 2005-02-22 Équipement et système de protection de couche optique de matrice de commutation et système de transmission wdm correspondant

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WO2006089452A1 true WO2006089452A1 (fr) 2006-08-31

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1424600A (zh) * 2002-12-30 2003-06-18 清华大学 一种光开关矩阵
US6721502B1 (en) * 2000-09-30 2004-04-13 Lucent Technologies Inc. Shared optical protection ring architecture

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6721502B1 (en) * 2000-09-30 2004-04-13 Lucent Technologies Inc. Shared optical protection ring architecture
CN1424600A (zh) * 2002-12-30 2003-06-18 清华大学 一种光开关矩阵

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