WO2012159341A1 - Multiplexeur d'insertion-extraction optique reconfigurable et répartiteur de longueur d'onde - Google Patents

Multiplexeur d'insertion-extraction optique reconfigurable et répartiteur de longueur d'onde Download PDF

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Publication number
WO2012159341A1
WO2012159341A1 PCT/CN2011/077474 CN2011077474W WO2012159341A1 WO 2012159341 A1 WO2012159341 A1 WO 2012159341A1 CN 2011077474 W CN2011077474 W CN 2011077474W WO 2012159341 A1 WO2012159341 A1 WO 2012159341A1
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WO
WIPO (PCT)
Prior art keywords
array
output
fiber
wavelength
multiplexer
Prior art date
Application number
PCT/CN2011/077474
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English (en)
Chinese (zh)
Inventor
张光勇
陈波
Original Assignee
华为技术有限公司
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.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201180001349.1A priority Critical patent/CN102696194B/zh
Priority to PCT/CN2011/077474 priority patent/WO2012159341A1/fr
Publication of WO2012159341A1 publication Critical patent/WO2012159341A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
    • H04J14/0212—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM] using optical switches or wavelength selective switches [WSS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
    • H04J14/02122—Colourless, directionless or contentionless [CDC] arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0215—Architecture aspects
    • H04J14/0217—Multi-degree architectures, e.g. having a connection degree greater than two

Definitions

  • the present invention relates to the field of communications, and in particular, to a reconfigurable optical add/drop multiplexer and a wavelength cross connector. Background technique
  • R0ADM Reconfigurable Optical Add-Drop Multiplexer
  • CDC R0ADM is the development direction of the future R0ADM architecture.
  • Colorless means that any port can output any wavelength
  • Directionless means that any wavelength can be scheduled to any direction
  • Contentionless means that when multiple directions need to be at the same wavelength locally, wavelength conflict does not occur.
  • the existing CDC R0ADM architecture includes: a line-side wavelength switching module, an upstream ADD module, and a downstream DROP module.
  • the line-side wavelength switching module is connected to the upper wave ADD module and the lower wave DROP module by using an optical fiber.
  • the line-side wavelength switching module may be composed of a plurality of WSS (wavelength selective switch).
  • the two WSSs form a wavelength switching sub-module in one direction; the ADD module and the DROP module each include a WSS and an optical switch, and the WSS is connected to the optical switch through an optical fiber.
  • the embodiment of the present invention provides a reconfigurable optical add/drop multiplexer R0ADM and a wavelength cross connector WXC.
  • the technical solution is as follows:
  • a reconfigurable optical add/drop multiplexer R0ADM comprising: a line side wavelength switching module, an uplink wave module and a down wave module, wherein the line side wavelength switching module respectively passes the optical wave module and the lower wave module Wave module connection;
  • the upper wave module includes an adjustable multiplexer, a first optical switch, and a transmitter; the adjustable multiplexer is connected to the first optical switch, and the first optical switch is connected to the transmitter through an optical fiber
  • the first optical switch is configured to connect a wavelength of a fiber sent by the transmitter to the tunable multiplexer; the tunable multiplexer is configured to multiplex the received fiber wavelength to generate a wave division Outputting the WDM optical signal to the line side wavelength switching module by using a WDM optical signal;
  • the lower wave module includes a tunable multiplexer, a second optical switch, and a receiver; the tunable multiplexer is connected to the second optical switch, and the second optical switch is connected to the receiver through an optical fiber
  • the multiplexer is configured to demultiplex the WDM optical signal from the line side wavelength switching module and output the signal to the second optical switch, where the second optical switch is used to demultiplex the WDM optical signal The subsequent fiber wavelength is connected to the receiver.
  • a wavelength cross connector WXC including:
  • a first input fiber array a first collimating unit, a first switching unit, a second switching unit, a second collimating unit, a multiplexer, and a first output fiber array;
  • the first input fiber array, the first collimating unit, the first switching unit, the second switching unit, the second collimating unit, the multiplexer and the first output fiber array are integrated in the WXC;
  • the first input fiber array is configured to receive a fiber wavelength, and output the fiber wavelength to a first collimating unit;
  • the first collimating unit is configured to receive the fiber wavelength, and output the fiber wavelength collimated to the The first level switching unit;
  • the first switching unit is configured to adjust a micro mirror corresponding to the fiber wavelength according to a control command, and output the fiber wavelength to the second switching unit;
  • the second switching unit is configured to adjust a beam reflection angle, and output the fiber wavelength to the second collimating unit; the second collimating unit is configured to output the fiber wavelength collimated to the multiplexing Device
  • the multiplexer is configured to multiplex the fiber wavelengths to generate and output a wavelength division multiplexed WDM optical signal to the first output fiber array;
  • the first output fiber array is for outputting the WDM optical signal.
  • a wavelength cross connector WXC including:
  • a second input fiber array a demultiplexer, a third collimating unit, a third switching unit, a fourth switching unit, a fourth collimating unit, and a second output fiber array;
  • the second input fiber array, the demultiplexer, the third collimating unit, the third switching unit, the fourth switching unit, the fourth collimating unit, and the second output fiber array are integrated in the WXC;
  • the second input fiber array is configured to receive a WDM optical signal, and output the WDM optical signal to a demultiplexer;
  • the demultiplexer is configured to receive the WDM optical signal, and demultiplex the WDM optical signal Projecting the demultiplexed fiber wavelength to the third collimating unit;
  • the third collimating unit is configured to adjust the wavelength of the demultiplexed optical fiber to the third switching unit; and the third switching unit is configured to adjust a micro mirror corresponding to the wavelength of the optical fiber according to a control command. Outputting the wavelength of the optical fiber to the fourth switching unit;
  • the fourth switching unit is configured to adjust a beam reflection angle, and output the fiber wavelength to the fourth collimating unit;
  • the fourth collimating unit is configured to couple the fiber wavelength to the second output fiber array; and the second output fiber array is configured to output the fiber wavelength.
  • the technical solution provided by the embodiment of the present invention has the beneficial effects that: the implementation of the adjustable multiplexer/reconcilable multiplexer in the upper wave module and the lower wave module of the R0ADM in this embodiment is relatively simple, and the cost thereof is compared with the existing one.
  • the WSS cost in the technology is low, and the cost of the ADD module and the DROP module is correspondingly reduced, thereby reducing the cost of the R0ADM in this embodiment.
  • FIG. 1 is a schematic structural diagram of an embodiment of a reconfigurable optical add/drop multiplexer R0ADM according to Embodiment 1 of the present invention
  • FIG. 2 is a reconfigurable optical add/drop multiplexer R0ADM according to Embodiment 2 of the present invention
  • FIG. 3 is a schematic structural diagram of an embodiment of a reconfigurable optical add/drop multiplexer R0ADM according to Embodiment 3 of the present invention
  • FIG. 4 is a reconfigurable light according to Embodiment 4 of the present invention
  • FIG. 5 is a schematic structural diagram of a wavelength cross-connect connector WXC according to Embodiment 5 of the present invention
  • FIG. 6 is a wavelength cross-connect connector WXC according to Embodiment 6 of the present invention
  • FIG. 7 is a first schematic diagram of an embodiment of a wavelength cross-connect connector WXC according to Embodiment 7 of the present invention
  • FIG. 8 is a diagram of a wavelength cross-connect connector WXC according to Embodiment 7 of the present invention. Two structural diagrams. detailed description
  • Embodiments of the present invention provide a reconfigurable optical add/drop multiplexer R0ADM and a wavelength cross-connector WXC.
  • FIG. 1 is a schematic structural diagram of an embodiment of a reconfigurable optical add/drop multiplexer R0ADM according to Embodiment 1 of the present invention
  • the R0ADM includes: a line side wavelength switching module 11, an uplink wave module 22, and a lower wave module 33, wherein the line side wavelength switching module 11 is respectively connected to the upper wave module 22 and the lower wave module 33 through an optical fiber;
  • the upper wave module 22 includes an adjustable multiplexer 221, a first optical switch 222, and a transmitter 223; the adjustable multiplexer 221 is connected to the first optical switch 222, and the first optical switch 222 passes An optical fiber is connected to the transmitter 223; the first optical switch 222 is configured to connect a fiber wavelength transmitted by the transmitter 223 to the adjustable multiplexer 221; the adjustable multiplexer 221 is configured to The received fiber wavelengths are multiplexed to generate a wavelength division multiplexed WDM optical signal, and the WDM optical signal is output to the line side wavelength switching module 11;
  • the lower wave module 33 includes a tunable multiplexer 331, a second optical switch 332, and a receiver 333; the multiplexer 331 is connected to the second optical switch 332, and the second optical switch 332 is An optical fiber is connected to the receiver 333.
  • the multiplexer 331 is configured to demultiplex the WDM optical signal from the line-side wavelength switching module 11 and output the signal to the second optical switch 332.
  • the implementation of the adjustable multiplexer/reconcilable multiplexer in the upper wave module and the lower wave module of the R0ADM is relatively simple, and the cost thereof is lower than that of the WSS in the prior art, and the ADD module is correspondingly reduced. And the cost of the DROP module, thereby reducing the cost of the ROOA in this embodiment.
  • the M-dimensional R0ADM having the CDC characteristics described in the embodiment of the present invention will be further described as an example.
  • FIG. 2 is a schematic structural diagram of an embodiment of a reconfigurable optical add/drop multiplexer R0ADM according to Embodiment 2 of the present invention.
  • R0ADM includes: Line-side wavelength switching module 11, ADD module 22 and DROP module
  • the line-side wavelength switching module 11 is connected to the ADD module 22 and the DROP module 33 by using an optical fiber.
  • the dimension of the R0ADM refers to the number of directions of the R0ADM connection, and the M is a positive integer. .
  • the line side wavelength switching module 11 includes 2M WSSs, and each of the two WSSs constitutes a wavelength switching submodule in one direction (not shown), and the 2M WSSs respectively constitute wavelength switching submodules in M directions.
  • the wavelength switching sub-module in each direction is composed of one WNS of 1 XN structure and one WSS of 1 NX 1 structure, wherein 1 XN WSS can output any fiber wavelength combination in the WDM optical signal of the input port to any On the output port, the WSS of NX 1 can combine any WDM optical signal of any input port and combine any fiber wavelength combination with the fiber wavelength of other input ports to output.
  • the output ports of 1 XN WSS in each direction are respectively connected to any one of the input ports of the WSS of the NX 1 and the input port of any of the DROP modules in the other direction, and may also retain some (not necessarily limited to a specific number). No, it is used as a protection port; the protection port is a backup port after the ADD/DROP module fails. Any input port of the N X 1 WSS in each direction is connected to any of the output ports of the ADD module, and an input port can also be reserved as a protection port for providing a backup port after the ADD/DROP module fails.
  • the line-side switching module is similar to the prior art. For the functions and functions, reference may be made to the related description in the prior art, and details are not described herein.
  • the ADD module 22 includes M 1 XN tunable multiplexers 221a and N 1 XM first optical switches 222a and N transmitters 223 (TX , transmitter ⁇
  • the first input port of each of the adjustable multiplexers 221a is connected to the first one of the first optical switches 222a through an optical fiber, and so on, and the nth of each of the adjustable multiplexers 221a
  • the input ports are connected to the nth first optical switch 222a through optical fibers; wherein the n is less than or equal to N; each of the first optical switches 222a is connected to one of the TXs 223 via an optical fiber.
  • the 1 ⁇ M first optical switch 222a is configured to connect the optical fiber wavelength transmitted by the TX 223 to any input port of the 1 ⁇ N tunable multiplexer 221a; the 1 ⁇ N adjustable The processor 221a is configured to multiplex the received fiber wavelength to generate a WDM optical signal, and output the WDM optical signal from an arbitrary output port to the line side wavelength switching module 11.
  • the DROP module 33 includes M 1 XN tunable multiplexers 331a and N 1 XM second optical switches 332a and N receivers 333 (RX , receiver) 0
  • the first output port of each of the reconcilable multiplexers 331a is connected to the first one of the second optical switches 332a via an optical fiber, and so on, and the nth of each of the reconcilable multiplexers 331a
  • the input ports are optically connected to the nth second optical switch 332a; wherein the n is less than or equal to N; each of the second optical switches is connected to one of the RXs 333 via an optical fiber.
  • the 1 XN tunable multiplexer 331a is configured to demultiplex the WDM optical signal from the M dimension, and output the second optical switch 332a connected to the 1 XM from any output port;
  • the second optical switch 332a of the XM is used to connect the demultiplexed fiber wavelength to the RX 333.
  • the adjustable multiplexer 221a and the first optical switch 222a may be connected without using an optical fiber, and the adjustable multiplexer 221a and the first optical switch 222a are set.
  • a first wavelength cross connector WXC correspondingly, the first WXC is optically connected to the transmitter 223;
  • the mediation multiplexer 331a and the second optical switch 332a may also be connected without using an optical fiber, and the reconcilable multiplexer 331a and the second optical switch 332a may be integrated into a second WXC.
  • the second WXC is optically connected to the receiver 333.
  • the optical opening may be a mechanical optical switch, a micro-electro mechanical optical switch (MEMS (Micro-Electro-Mechanical Systems)), a waveguide type optical switch, a liquid crystal optical switch, etc., or may be other forms of optical switches.
  • MEMS Micro-Electro-Mechanical Systems
  • the optical switch in the embodiment of the present invention is not limited thereto;
  • the tunable multiplexer 221a and the tunable multiplexer 331a in this embodiment can output any one of the wavelengths at any port.
  • the tunable multiplexer 221a and the tunable multiplexer 331a each include an AWG (Arrayed Waveguide Grating) and an OXC (Optical Cross-Connect); the AWG and the 0XC.
  • AWG Arrayed Waveguide Grating
  • OXC Optical Cross-Connect
  • AWG Replaces 0XC input fiber array
  • 0XC uses 2D planar structure, internal light
  • the components are interconnected using spatial optics.
  • the tunable multiplexer 221a and the tunable multiplexer 331a each include an AWG and an optical cross-connect 0XC; the AWG is coupled to the 0XC through an optical fiber.
  • the tunable multiplexer 221a and the tunable multiplexer 331a each include a grating, a Fourier lens, and an OXC; the grating, the Fourier lens, and the NMOS are integrated, wherein the grating and the Fourier lens Instead of 0XC input fiber array; 0XC adopts two-dimensional planar structure, and internal optical components are interconnected by space optics.
  • the tunable multiplexer 221a and the tunable multiplexer 331a are implemented based on the principle of a microring resonator, wherein the working principle of the microring resonator is achieved by controlling the refractive index of the microring waveguide. Resonance at different wavelengths, thereby achieving different wavelengths of output.
  • the tunable multiplexer 221a and the tunable multiplexer 331a are implemented using a related art like a large port WSS.
  • the R0ADM in this embodiment has the CDC characteristic, that is, the R0ADM has the colorless characteristic, the directionless characteristic, and the contentionless characteristic. Due to the colorless nature of the tunable multiplexer, the tunable multiplexer, and the optical switch (including the first optical switch and the second optical switch), the wavelength of the DROP module download (or ADD module upload) has a colorless characteristic; due to the DROP module Wavelengths from any of the M directions can be downloaded, or the ADD module can output the upload wavelength to any of the M directions. The wavelengths that need to be downloaded (or uploaded) have a directionless characteristic; if the first and the Mth The same wavelength in the direction needs to be downloaded locally (or uploaded). Two identical wavelengths can be downloaded (or uploaded) to different RX (or TX), ie contentionless features, through the control of the optical switch.
  • the WSS in the prior art can simultaneously output multiple wavelengths on each port, which also increases the cost of the WSS. In most cases, it is not necessary to output multiple wavelengths simultaneously on each port in most cases.
  • the tunable multiplexer/reconcilable multiplexer does not output multiple wavelengths simultaneously on each port, but outputs any wavelength at any port, making the tunable multiplexer/reconcilable multiplexer more than the prior art The cost of WSS is reduced.
  • the implementation of the tunable multiplexer/reconcilable multiplexer in this embodiment is relatively simple, and the cost thereof is lower than that of the WSS in the prior art, and the cost of the ADD module and the DROP module is correspondingly reduced, thereby making the implementation The cost of R0ADM in the example is reduced.
  • Example 3
  • FIG. 3 is a schematic structural diagram of an embodiment of a reconfigurable optical add/drop multiplexer R0ADM according to Embodiment 3 of the present invention.
  • FIG. 3 is an example of a 3-dimensional R0ADM.
  • the dimension of R0ADM mentioned above refers to the number of directions of R0ADM connection.
  • a 3-dimensional R0ADM is connected in three directions: east, north, and west.
  • the ROADM includes: a line side wavelength switching module 11, an ADD module 22, and a DROP module 33.
  • the line side wavelength switching module 11 is respectively connected to the ADD module 22 and the DROP module 33 through an optical fiber.
  • the line-side wavelength switching module 11 includes six WSSs, and each two WSSs form a wavelength switching sub-module in one direction, and six WSSs respectively form east-, north-, and west-direction wavelength switching sub-modules.
  • the wavelength switching sub-module in each direction is similar to the wavelength switching sub-module in Embodiment 2. For details, refer to the related description in Embodiment 2, and details are not described herein again.
  • the ADD module 22 includes three I X 23 tunable multiplexers 221b and 23 1 X 3 first optical switches 222b and 23 TX 223.
  • the first input port of each of the adjustable multiplexers 221b is connected to the first one of the first optical switches 222b through an optical fiber, and so on, and the third of each of the adjustable multiplexers 221b
  • the input ports are connected to the third first optical switch 222b through optical fibers; each of the first optical switches 222b is connected to one of the TXs 223 via an optical fiber.
  • the functions of the tunable multiplexer 221b of the 1 ⁇ 23 and the first optical switch 222b of the IX 3 are similar to those of the tunable multiplexer 221a and the first optical switch 222a in Embodiment 2, specifically Reference is made to the related description in Embodiment 2, and details are not described herein again.
  • the DROP module 33 comprises three 1 X 23 tunable multiplexers 331b and 23 1 X 3 second optical switches 332b and 23 RX 333.
  • the first output port of each of the reconcilable multiplexers 331b is optically coupled to the first one of the second optical switches 332b, and so on, and the third of each of the reconcilable multiplexers 331b
  • the output port is optically coupled to the third of the second optical switches 332b; each of the second optical switches 332b is coupled to one of the RXs 333 via an optical fiber.
  • the adjustable multiplexer 221b of the 1 ⁇ 23 and the first optical switch 222b of the 1 ⁇ 3 may be connected without using an optical fiber, but the adjustable multiplexer 221b is The first optical switch 222b is integrated into a first wavelength cross connector WXC, and correspondingly, the first WXC is optically connected to the transmitter 223;
  • the multiplexer 331b of the 1 ⁇ 23 and the second optical switch 332b of the IX3 may also be connected without using an optical fiber, but the reconcilable multiplexer 331b and the second The optical switch 332b is integrated into a second WXC.
  • the second WXC is optically coupled to the receiver 333.
  • the tunable multiplexer 221b and the tunable multiplexer 331b in this embodiment can output any wavelength on any port.
  • the tunable multiplexer 221b and the tunable multiplexer 331b each include an arrayed waveguide grating AWG and an optical cross-connect OXC; the AWG and the OXC are integrated, wherein the AWG replaces the 0XC input optical fiber array; 0XC With a two-dimensional planar structure, the internal optical components are interconnected using spatial optics.
  • the tunable multiplexer 221b and the tunable multiplexer 331b each include an AWG and an optical cross-connect 0XC; the AWG is connected to the 0XC through an optical fiber.
  • the tunable multiplexer 221b and the tunable multiplexer 331b each include a grating, a Fourier lens, and an OXC; the grating, the Fourier lens, and the OXC are integrated, wherein the grating and the Fourier lens Instead of 0XC input fiber array; 0XC adopts two-dimensional planar structure, and internal optical components are interconnected by space optics.
  • the tunable multiplexer 221b and the tunable multiplexer 331b are implemented by using a micro-ring resonator based on the principle that the micro-ring resonator works by controlling the refractive index of the micro-ring waveguide. Resonance at different wavelengths, thereby achieving different wavelengths of output.
  • the tunable multiplexer 221b and the tunable multiplexer 331b are implemented using a related art like a large port WSS.
  • the optical switch of 3 can be used to implement the 3 X 23 wavelength cross connector C.
  • the R0ADM in this embodiment has the CDC characteristic, that is, the R0ADM has the colorless characteristic, the directionless characteristic, and the content ionless characteristic; the wavelength scheduling and the CDC characteristic of the R0ADM in the present embodiment are specifically described below.
  • Wavelength scheduling It is assumed that the northbound wavelength needs to be scheduled to the west direction. Specifically, the WSS in the northbound wavelength switching submodule configures the required scheduled wavelength to the output port, and the output port is an output port connected to the north direction and the west direction; From the north input to the west, the WSS in the west-to-wavelength switching sub-module is configured to output the wavelength from the west to the output port.
  • the WSS in the northbound wavelength switching submodule configures the required scheduled wavelength to the output port, which is in the northbound and local Drop (or ADD) modules.
  • 1 X 23 the output port of the WXC connection, the wavelength is input to the WXC of 1 X 23 in the local Drop module, and the WXC of 1 X 23 can output the wavelength to any one of the output ports thereon; for the same reason, If you need to upload the desired wavelength locally to the north, you can also configure it to output from any of the WXC's output ports to the north.
  • Direct ionless feature Assume that the Add module uploads a wavelength, which can be input through any input port of WXC of 1 X 23. After configuration, it can be output to any of the following directions through any output port of WXC of 1 X 23 : East, North, and West; Similarly, assuming the DROP module downloads a wavelength, you can input wavelengths from any of the three directions (such as east, north, and west) through any of the WXC's input ports of the IX 23. After the configuration, the wavelength can be output through any one of the output ports of the WXC of 1 ⁇ 23.
  • the WSS inputs the wavelength ⁇ to any input port of the WXC of 1 ⁇ 23, and the westward WSS inputs the wavelength ⁇ Another input port to the WXC of 1J 1X23; with the 1X23 WXC configuration, the same wavelength ⁇ from both directions can be received in two RXs without local fluctuation due to the same wavelength from different directions. Receive, improve network flexibility and reduce network wavelength conflicts.
  • 3X23 WXCs are implemented by three 1X23 tunable multiplexers/reconcilable multiplexers combined with 23 1X3 optical switches; if 4D R0ADM, 4X23 WXCs can use 4 1X23
  • the tunable multiplexer/reconcilable multiplexer is implemented with 23 1X4 optical switches to meet the requirements of 4D R0ADM.
  • 8 X 23 WXC can use 8 1 X 23
  • the multiplexer/reconcilable multiplexer is implemented with 23 1 x 8 optical switches to meet the requirements of 8-dimensional R0ADM.
  • the dimension expansion can be realized by increasing the number of adjustable multiplexers/tunable demultiplexers, thereby improving the dimensional expansion performance of the R0ADM.
  • the implementation of the tunable multiplexer/reconcilable multiplexer in this embodiment is relatively simple, and the cost thereof is compared with that in the prior art.
  • the low cost of the WSS reduces the cost of the ADD module and the DROP module accordingly, thereby reducing the cost of the R0ADM in this embodiment.
  • the integration of the modules is also improved, and the degree of integration is greatly improved compared to the prior art.
  • FIG. 4 is a schematic structural diagram of an embodiment of a reconfigurable optical add/drop multiplexer R0ADM according to Embodiment 4 of the present invention.
  • the R0ADM includes: a line-side wavelength switching module 11, an ADD module 22, and a DROP module 33, wherein the line-side wavelength switching module 11 is respectively connected to the ADD module 22 and the DROP module 33 through an optical fiber;
  • the dimension of the R0ADM refers to the number of directions in which the R0ADM is connected, and the M is a positive integer.
  • the line-side wavelength switching module 11 includes 2M WSSs, and each of the two WSSs constitutes a wavelength-switching sub-module in one direction, and 2M WSSs respectively constitute wavelength-switching sub-modules in M directions.
  • the wavelength switching sub-module in each direction is similar to the wavelength switching sub-module in Embodiment 2. For details, refer to the related description in Embodiment 2, and details are not described herein again.
  • the upper wave module 22 includes M 1XN adjustable multiplexers 221a, N 1 XM first optical switches 222a, and N transmitters 223, the 1XN adjustable multiplexer 221a and the 1XM
  • the first optical switch 222a is connected to the transmitter 223 through an optical fiber.
  • the first optical switch 222a includes a first input optical fiber array 2201a, a first collimating unit 2202a, and a first optical switch 222a.
  • An exchange unit 2203a; the tunable multiplexer 221a includes a second switching unit 2204a, a second collimating unit 2205a, a multiplexer 2206a, and a first output fiber array 2207a.
  • connection relationship between the 1XN tunable multiplexer 221a and the 1XM first optical switch 222a may be any of the following:
  • the tunable multiplexer 221a is connected to the first optical switch 222a via an optical fiber;
  • the tunable multiplexer 221a is integrated with the first optical switch 222a as a first WXC (Wavelength Cross Connection, wavelength cross connector);
  • the first WXC is connected to the transmitter 223 fiber.
  • the first input fiber array 2201a is configured to receive a fiber wavelength transmitted by the transmitter 223, and output the fiber wavelength to the first collimating unit 2202a.
  • the transmitter 223 transmits the fiber wavelength to the first input fiber array 2201a through the optical fiber, and the first input fiber array 2201a is located at the input port of the first optical switch 222a.
  • the first collimating unit 2202a is configured to receive the wavelength of the optical fiber, and output the optical fiber wavelength to the first-stage switching unit 2203a.
  • the first collimating unit 2202a is a collimator array.
  • the first switching unit 2203a is configured to adjust a micro mirror corresponding to the wavelength of the optical fiber according to a control command, and output the wavelength of the optical fiber to the second switching unit 2204a.
  • the content of the control command is a destination output port corresponding to a fiber wavelength.
  • the first switching unit After receiving the wavelength of the fiber, the first switching unit adjusts a micromirror corresponding to the fiber wavelength according to a control command, and the fiber wavelength is Output from the destination output port to the second switching unit 2204a.
  • the second switching unit 2204a is configured to adjust a beam reflection angle, and output the fiber wavelength to the second collimating unit 2205a.
  • the second switching unit 2204a is an output MEMS array or an output LCOS (Liquid Crystal on SiLicon) array; or, when the first switching unit When the 2203a is an input Lcos array, the second switching unit 2204a may be an output Lcos array or an output MEMS array.
  • LCOS Liquid Crystal on SiLicon
  • the output MEMS array or output Lcos array can be a two dimensional array.
  • each fiber wavelength (spot) corresponds to one MEMS image point or Lcos image point; the number of MEMS image points of the input MEMS array depends on the number of input fibers and the number of wavelengths in each fiber, that is, the number of MEMS image points is equal to the number of input fibers multiplied The number of wavelengths in each fiber; the number of MEMS image points of the output MEMS array depends on the number of wavelengths to be output.
  • the second collimating unit 2205a is configured to output the optical fiber wavelength to the multiplexer 2206a.
  • the second collimating unit 2205a may be a Fourier lens or a microlens array.
  • the multiplexer 2206a is configured to multiplex the fiber wavelengths to generate and output WDM optical signals to the first output fiber array 2207a.
  • the multiplexer 2206a may be a grating; or the multiplexer 2206a is a planar optical waveguide device, such as an AWG; or the multiplexer 2206a is a microring array.
  • the first output fiber array 2207a is configured to output the WDM optical signal to the line side wavelength switching module 11. In an actual application, the WDM optical signal is transmitted to the line side wavelength switching module 11 through an optical fiber; the first output optical fiber array 2207a is located at an output port side of the adjustable multiplexer 221a.
  • the tunable multiplexer 221a is integrated with the first optical switch 222a as the first WXC, correspondingly, the first input optical fiber array 2201a is located on the input port side of the first WXC; the first output The fiber array 2207a is located on the output port side of the first WXC.
  • the input MEMS array is a one-dimensional array
  • the output MEMS array may be a one-dimensional array or a two-dimensional array
  • the output MEMS array is a two-dimensional array.
  • the collimator array is a two-dimensional array, corresponding to the input MEMS array and output
  • the MEMS array is a two-dimensional array
  • the input MEMS array is a two-dimensional array
  • the output MEMS array is a two-dimensional array
  • the microlens array is a two-dimensional array
  • the DROP module 33 includes M 1 XN tunable multiplexers 331a and N 1 XM second optical switches 332a and N receivers 333, and the 1 XN tunable multiplexer 331a and the 1 XM's second optical switch 332a is connected, and the 1 XM second optical switch 332a is connected to the transmitter 333 through an optical fiber; wherein the reconcilable multiplexer 331a includes a second input optical fiber array 3301a, demultiplexed
  • the third optical switch 332a includes a fourth switching unit 3305a, a fourth collimating unit 3306a, and a second output optical fiber array.
  • connection relationship between the 1 X N tunable multiplexer 331a and the 1 X M second optical switch 332a may be any of the following:
  • the multiplexer 331a is connected to the second optical switch 332a via an optical fiber
  • the second WXC is optically connected to the receiver 333.
  • the second input fiber array 3301a is configured to receive the WDM optical signal sent by the line side wavelength switching module 11, and output the WDM optical signal to the demultiplexer 3302a.
  • the line side wavelength switching module 11 transmits a WDM optical signal to the second input optical fiber array 3301a through an optical fiber; and the second input optical fiber array 3301a is located at an input port side of the tunable multiplexer 331a.
  • the demultiplexer 3302a is configured to receive the WDM optical signal, demultiplex the WDM optical signal, and project the demultiplexed optical fiber wavelength to the third collimating unit 3303a.
  • the demultiplexer 3302a may be a raster; or the demultiplexer 3302a is a planar optical waveguide.
  • the AWG; or, the demultiplexer 3302a is a microring array.
  • the third collimating unit 3303a is configured to align the demultiplexed fiber wavelength to the third switching unit 3304a.
  • the third collimating unit 3303a may be a Fourier lens or a microlens array.
  • the third switching unit 3304a is configured to adjust a micro mirror corresponding to the fiber wavelength according to a control command, and output the fiber wavelength to the fourth switching unit 3305a.
  • the content of the control command is a destination output port corresponding to a fiber wavelength
  • the third switching unit 3304a adjusts a micro mirror corresponding to the fiber wavelength according to a control command
  • the fiber is The wavelength is output from the destination output port to the fourth switching unit 3305a.
  • the fourth switching unit 3305a is configured to adjust a beam reflection angle, and output the fiber wavelength to the fourth collimating unit 3306a.
  • the fourth switching unit 3305a is an output MEMS array or an output Lcos array; or, when the third switching unit 3304a is an input Lcos array, the fourth The switching unit 3305a may be an output Lcos array or an output MEMS array.
  • the output MEMS array or output Lcos array can be a two dimensional array.
  • each fiber wavelength corresponds to one MEMS image point or Lcos image point
  • the number of MEMS image points of the input MEMS array depends on the number of input fibers and the number of wavelengths in each fiber, that is, the number of MEMS image points is equal to the number of input fibers multiplied
  • the number of wavelengths in each fiber for example: 4D * 80 waves / dimension
  • the number of MEMS image points of the output MEMS array depends on the number of wavelengths to be output, for example: 4 input fibers, the average output of each wave is 10 waves, ie The maximum output of the entire WXC is 40 waves, and the number of MEMS image points of the output MEMS array is 40.
  • the fourth collimating unit 3306a is configured to couple the wavelength of the fiber to the second output fiber array 3307a.
  • the fourth collimating unit is a collimator array.
  • the second output fiber array 3307a is for outputting the fiber wavelength to the receiver 333.
  • the wavelength of the light is output to the receiver 333 through the optical fiber; and the second output fiber array 3307a is located on the output port side of the second optical switch 332a.
  • the second input fiber array 3301a is located at an input port side of the second WXC;
  • the fiber array 3307a is located on the output port side of the second WXC.
  • the collimator array is a one-dimensional array; Or, preferably, when the input MEMS array and the output MEMS array are two-dimensional arrays, correspondingly, the collimator array is a two-dimensional array;
  • the input MEMS array is a one-dimensional array
  • the output MEMS array is a two-dimensional array
  • the collimator array is a two-dimensional array
  • the first WXC in the ADD module and the second WXC in the DROP module in this embodiment can be implemented by the same device, that is, the first WXC component in the ADD module and the first in the DROP module.
  • the components of the second WXC are consistent; specifically, the first WXC in the ADD module can be reversed to implement the function of the second WXC in the DROP module, that is, the input end of the first WXC in the ADD module is used as an output.
  • the second WXC function in the DROP module can be implemented.
  • the first input fiber array 2201a and the second output fiber array 3307a may be implemented by the same module; the first collimating unit 2202a and the fourth collimating unit 3306a may use the same module.
  • the first switching unit 2203a and the fourth switching unit 3305a may be implemented by using the same module; the second switching unit 2204a and the third switching unit 3304a may be implemented by using the same module;
  • the collimating unit 2205a and the third collimating unit 3303a may be implemented by the same module; the multiplexer 2206a and the demultiplexer 3302a may be implemented by the same module; the first output fiber array 2207a and The second input fiber array 3301a can be implemented with the same module.
  • a first Fourier lens may be added between the input MEMS array and the output MEMS array, and the first Fourier lens is used to form a beam of light wavelength Perform shaping.
  • a second Fourier lens can also be added between the input MEMS array and the output MEMS array, the function of the second Fourier lens and the function of the first Fourier lens Similar, it will not be repeated here.
  • the R0ADM in this embodiment has the CDC characteristic, that is, the R0ADM has the colorless characteristic, the directionless characteristic, and the contentionless characteristic. Since the WXC has colorless features, the wavelength of the DROP module download (or ADD module upload) has a colorless feature; since the WXC can download wavelengths from any of the M directions, or the WXC can output the upload wavelength to any of the M directions. In one direction, the wavelength that needs to be downloaded (or uploaded) has a directionless characteristic; if the same wavelength in the first and M directions needs to be downloaded locally (or uploaded), it can be adjusted by the control of the optical switch, and the two are the same. The wavelengths are downloaded (or uploaded) to different RX (or TX), ie contentionless features.
  • the upper wave module of the R0ADM and the WXC of the lower wave module are implemented in an integrated manner, and the structure is relatively simple, and the cost thereof is lower than that of the WSS in the prior art, and the upper wave ADD module and the lower wave are correspondingly reduced.
  • the cost of the wave DROP module thereby reducing the cost of the ROOA in this embodiment.
  • FIG. 5 is a schematic structural diagram of a wavelength cross connector WXC embodiment according to Embodiment 5 of the present invention.
  • the WXC includes:
  • first input fiber array 2201 a first input fiber array 2201, a first collimating unit 2202, a first switching unit 2203, a second switching unit 2204, a second collimating unit 2205, a multiplexer 2206, and a first output fiber array 2207;
  • the first input fiber array 2201, the first collimating unit 2202, the first switching unit 2203, the second switching unit 2204, the second collimating unit 2205, the multiplexer 2206, and the first output fiber array 2207 are integrated in the In the WXC, the first input fiber array 2201 is configured to receive a fiber wavelength, and output the WDM optical signal to the first collimating unit 2202;
  • the first collimating unit 2202 is configured to receive the wavelength of the optical fiber, and output the optical fiber wavelength to the first-stage switching unit 2203;
  • the first switching unit 2203 is configured to adjust the micro-mirror corresponding to the fiber wavelength according to the control command, and output the wavelength of the fiber to the second switching unit 2204;
  • the second switching unit 2204 is configured to adjust a beam reflection angle, and output the fiber wavelength to the second collimating unit 2205;
  • the second collimating unit 2205 is configured to output the optical fiber wavelength to the multiplexer 2206;
  • the multiplexer 2206 is configured to multiplex the optical fiber wavelengths, generate and output a wavelength division multiplexed WDM optical signal to the first output optical fiber array 2207;
  • the first output fiber array 2207 is for outputting the WDM optical signal.
  • the multiplexer is a grating or arrayed waveguide grating AWG or a microring array.
  • the second collimating unit is a Fourier lens or a microlens array; correspondingly, the first collimating unit is a collimator array.
  • the first switching unit is an input MEMS array
  • the second switching unit is an output MEMS array or an output Lcos array
  • the first switching unit is an input silicon-based liquid crystal Lcos array
  • the second switching unit is an output Lcos array or an output MEMS array.
  • the output MEMS array or the output Lcos array is a two-dimensional array.
  • FIG. 6 is a schematic structural diagram of an embodiment of a wavelength cross connector WXC according to Embodiment 6 of the present invention.
  • the WXC includes:
  • a second input fiber array 3301 a demultiplexer 3302, a third collimating unit 3303, a third switching unit 3304, a fourth switching unit 3305, a fourth collimating unit 3306, and a second output fiber array 3307;
  • the second input fiber array 3301, the demultiplexer 3302, the third collimating unit 3303, the third switching unit 3304, the fourth switching unit 3305, the fourth collimating unit 3306, and the second output fiber array 3307 are integrated in the In the WXC;
  • the second input fiber array 3301 is configured to receive a WDM optical signal, and output the WDM optical signal to a demultiplexer 3302;
  • the demultiplexer 3302 is configured to receive the WDM optical signal, demultiplex the WDM optical signal, and project the demultiplexed optical fiber wavelength to the third collimating unit 3303;
  • the third collimating unit 3303 is configured to align the demultiplexed fiber to the third switching unit 3304;
  • the third switching unit 3304 is configured to adjust the micro mirror corresponding to the fiber wavelength according to the control command, and output the wavelength of the fiber to the fourth switching unit 3305;
  • the fourth switching unit 3305 is configured to adjust a beam reflection angle, and output the fiber wavelength to the fourth collimating unit 3306;
  • the fourth collimating unit 3306 is configured to couple the fiber wavelength to the second output fiber array 3307; the second output fiber array 3307 is configured to output the fiber wavelength.
  • the demultiplexer is a grating or arrayed waveguide grating AWG or a microring array.
  • the third collimating unit is a Fourier lens or a microlens array; correspondingly, the fourth collimating unit is a collimator array.
  • the first switching unit is an input MEMS array
  • the second switching unit is an output MEMS array or an output Lcos array
  • the first switching unit is an input silicon-based liquid crystal Lcos array
  • the second switching unit is an output Lcos array or an output MEMS array.
  • the output MEMS array or the output Lcos array is a two-dimensional array.
  • the WXC in this embodiment is implemented in an integrated manner, and the structure is relatively simple, and the cost thereof is lower than that of the WSS in the prior art, and the cost of the upper wave ADD module and the lower wave DROP module can be reduced accordingly, thereby making the R0ADM Reduce costs.
  • Example 7
  • FIG. 7 is a first structural diagram of an embodiment of a wavelength cross connector WXC according to Embodiment 7 of the present invention. Intention.
  • the WXC includes:
  • Input fiber array 701 (not shown), grating 702, Fourier lens 703, input MEMS array 704, output MEMS array 705, collimator array 706, and output fiber array 707 (not shown); Input fiber array 701, grating 702, Fourier lens 703, input MEMS array 704, output MEMS array 705, collimator array 706, and output fiber array 707 are integrated into the WXC.
  • the input fiber array 701 is for receiving WDM optical signals.
  • the grating 702 is configured to receive a WDM optical signal transmitted by the input optical fiber array 701, demultiplex the WDM optical signal, and project the demultiplexed optical fiber wavelength to the Fourier lens 703.
  • the Fourier lens 703 is used to align the demultiplexed fiber wavelengths up to the input MEMS array 704.
  • the input MEMS array 704 is configured to adjust a MEMS micromirror corresponding to the fiber wavelength according to a control command, and output the fiber wavelength from the destination output port to the output MEMS array 705.
  • the output MEMS array 705 is configured to adjust a beam reflection angle, and output the fiber wavelength to the collimator array
  • the collimator array 706 is for coupling the fiber wavelengths to the output fiber array 707.
  • the output fiber array 707 is for outputting the fiber wavelength.
  • the grating 702 in this embodiment may be replaced by an AWG 708. Accordingly, the Fourier lens 703 is replaced by a microlens array 709, as shown in FIG. 8.
  • FIG. 8 is a wavelength crossover provided in Embodiment 7 of the present invention.
  • the function of the AWG 708 is similar to that of the 702. For details, refer to the related description in Embodiment 7, and details are not described herein.
  • the function of the microlens array 709 is similar to that of the Fourier lens 703. For details, refer to the related description in Embodiment 7, and details are not described herein again.
  • the grating 702 may be replaced by a micro-ring array, and the function of the micro-ring array is similar to that of the grating 702.
  • the function of the micro-ring array is similar to that of the grating 702.
  • the input MEMS array 704 in this embodiment can also be replaced with an input Lcos array.
  • the WXC in this embodiment can be used in the DROP module to implement the corresponding function of the WXC. Because of the reversibility of the optical path, the output end of the WXC in this embodiment can also be used as an input end, and the corresponding input end is used as an output end.
  • the corresponding function of the WXC in the ADD module refer to the related description of Embodiment 4.
  • the WXC in this embodiment can also be used in other devices to implement its functions, and is not limited to being applied to the ROADM.
  • the WXC in this embodiment is implemented in an integrated manner, and the structure is relatively simple, and the cost thereof is lower than that of the WSS in the prior art, and the cost of the upper wave ADD module and the lower wave DROP module can be reduced accordingly, thereby making the R0ADM Reduce costs.
  • each embodiment in the specification is described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same similar parts between the embodiments are referred to each other. can.
  • a person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium.
  • the storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like.

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Abstract

La présente invention se rapporte à un multiplexeur d'insertion-extraction optique reconfigurable (ROADM, Reconfigurable Optical Add-Drop Multiplexer) et à un répartiteur de longueur d'onde (WXC, Wavelength Cross Connect). L'invention appartient au domaine technique des communications. Le ROADM selon l'invention comprend un module de commutation de longueur d'onde sur le côté ligne, un module de commutation de longueur d'onde à la hausse, et un module de commutation de longueur d'onde à la baisse, le module de commutation de longueur d'onde à la hausse comprenant un multiplexeur réglable, un premier commutateur optique, et un transmetteur. Selon la présente invention, le premier commutateur est utilisé pour connecter au multiplexeur réglable une longueur d'onde de fibre optique transmise par le transmetteur. Le multiplexeur réglable est utilisé pour multiplier la longueur d'onde reçue, pour générer un signal optique à multiplexage par répartition en longueur d'onde (WDM, Wavelength Division Multiplexing), et pour délivrer en sortie le signal optique WDM à destination du module de commutation de longueur d'onde sur le côté ligne. D'autre part, le module de commutation de longueur d'onde à la baisse comprend un multiplexeur réglable, un second commutateur optique, et un récepteur. Le multiplexeur réglable est utilisé pour démultiplexer le signal optique WDM à partir du module de commutation de longueur d'onde sur le côté ligne, et pour délivrer en sortie le signal optique WDM démultiplexé à destination du second commutateur optique, le second signal optique étant utilisé pour connecter la longueur d'onde de fibre optique démultiplexée au récepteur. La solution technique décrite dans les modes de réalisation de la présente invention permet de réduire le coût du ROADM.
PCT/CN2011/077474 2011-07-22 2011-07-22 Multiplexeur d'insertion-extraction optique reconfigurable et répartiteur de longueur d'onde WO2012159341A1 (fr)

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