WO2011130985A1 - Codeur-décodeur reconfigurable, et réseau optique passif ocdma-pon mettant en œuvre un tel codeur-décodeur - Google Patents

Codeur-décodeur reconfigurable, et réseau optique passif ocdma-pon mettant en œuvre un tel codeur-décodeur Download PDF

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Publication number
WO2011130985A1
WO2011130985A1 PCT/CN2010/076304 CN2010076304W WO2011130985A1 WO 2011130985 A1 WO2011130985 A1 WO 2011130985A1 CN 2010076304 W CN2010076304 W CN 2010076304W WO 2011130985 A1 WO2011130985 A1 WO 2011130985A1
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Prior art keywords
optical
reconfigurable
output
awg
data
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PCT/CN2010/076304
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English (en)
Chinese (zh)
Inventor
耿丹
朱松林
陈彪
王大伟
成亮
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中兴通讯股份有限公司
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Publication of WO2011130985A1 publication Critical patent/WO2011130985A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/12007—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind forming wavelength selective elements, e.g. multiplexer, demultiplexer
    • G02B6/12009—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind forming wavelength selective elements, e.g. multiplexer, demultiplexer comprising arrayed waveguide grating [AWG] devices, i.e. with a phased array of waveguides
    • G02B6/12019—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind forming wavelength selective elements, e.g. multiplexer, demultiplexer comprising arrayed waveguide grating [AWG] devices, i.e. with a phased array of waveguides characterised by the optical interconnection to or from the AWG devices, e.g. integration or coupling with lasers or photodiodes
    • G02B6/12021—Comprising cascaded AWG devices; AWG multipass configuration; Plural AWG devices integrated on a single chip
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/12007—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind forming wavelength selective elements, e.g. multiplexer, demultiplexer
    • G02B6/12009—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind forming wavelength selective elements, e.g. multiplexer, demultiplexer comprising arrayed waveguide grating [AWG] devices, i.e. with a phased array of waveguides
    • G02B6/12033—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind forming wavelength selective elements, e.g. multiplexer, demultiplexer comprising arrayed waveguide grating [AWG] devices, i.e. with a phased array of waveguides characterised by means for configuring the device, e.g. moveable element for wavelength tuning

Definitions

  • the present invention belongs to the field of optical fiber communication technologies, and in particular, to a reconfigurable encoder/decoder, and an optical line termination (OLT, Optical Line Terminate) and an optical network unit (ONU) based on the reconfigurable encoder/decoder.
  • OLT optical line termination
  • ONU optical network unit
  • Optical Network Unit Optical Network Unit
  • OCDMA Optical Code Division Multiple Access
  • PON Passive Optical Network
  • the access network is a service node interface (SNI, Service Node).
  • SNI service node interface
  • the passive optical network has become a popular technology for optical access networks due to its wide frequency bandwidth, large capacity, convenient expansion, and suitable for high-speed data transmission.
  • time division multiple access TDMA, Time Division) Multiple Access
  • WDMA Wavelength Division Multiple Access
  • OCDMA optical code division multiple access multiplexing
  • OCDMA-PON Passive optical network based on optical code division multiple access (multiplexing) is a multiple access multiplexing technology that combines the large bandwidth of fiber medium and the flexibility of code division multiple access multiplexing (CDMA).
  • CDMA code division multiple access multiplexing
  • the optical line terminal is an optical line terminal based on optical code division multiple access technology
  • the optical network unit is an optical network unit based on optical code division multiple access technology.
  • optical optical code division multiple access multiplexing based passive optical network may further include one or more optical network terminations (ONTs), the one or more network terminals and one or more The optical network units are connected as specific users of the optical network unit.
  • OTDMA-PON optical network terminations
  • each user is assigned a unique optical encoder/decoder in the 0NU (when the encoded signal passes, it is an optical decoder, and when the original signal passes, it is an optical encoder).
  • the encoded user data is passed through the optical wiring to the OLT through the optical encoder.
  • the encoded data stream is inversely processed by the optical decoder through the optical decoder (ie, the inverse processing of the optical encoding process) to implement optical decoding.
  • the decoded data stream is then uploaded to other core networks through the transmitter in the OLT to realize mutual transmission of information between the ONUs of different PONs.
  • the data stream transmitted from the core network is modulated at the OLT end, and then encoded by the optical encoder, and then the encoded data stream is transmitted to the optical distribution network through the optical fiber channel, and the data flows through the optical distribution network to downlink data. It is transmitted to each ONU or ONT, and the data stream encoded at the ONU end is decoded by the optical decoder, and the transmission data is recovered to receive the user data.
  • the optical encoder/decoder is the core component of the OCDMA system.
  • the optical encoder converts the data bits into a spreading sequence
  • the optical decoder at the receiving end recovers the spreading sequence to data bits using the correlation decoding principle.
  • all users share the same optical segment and time segment of the same channel.
  • the signals used by different users to transmit information are distinguished by different coding sequences, that is, each user is assigned a pseudo-random sequence.
  • the pseudo-random sequence is generated by the optical encoder by each user's information.
  • the pseudo-random sequence is also unique, and each information bit of the user is encoded into a series of pulses; at the receiving end, the user Correlation operations are performed with the same pseudo-random sequence (corresponding decoder) to recover the transmitted information.
  • These pseudo-random sequences are called the user's address code, and each coded pulse is called a chip.
  • optical encoder/decoder directly affect the overall performance of the OCDMA system, which determines
  • OCDMA encoder/decoder the main types of OCDMA encoder/decoder are: time domain encoding/decoding scheme based on fiber delay line, spectral domain encoding/decoding scheme based on diffraction grating and phase mask, encoding/decoding scheme based on fiber Bragg grating, array-based waveguide The encoding/decoding scheme of the raster.
  • Fiber delay line coding system The system consists of several bundles of fibers and two ⁇ ⁇ star couplers. The difference between different codeword encoders is the delay length of the fiber delay lines.
  • the encoder divides an input light pulse into several pulses of equal power through a power divider, and the pulses are recombined by the optical coupler after different delays, thereby converting an input light pulse into a pulse.
  • This type of encoder is relatively easy to implement, but requires more devices and is cumbersome. In actual production, it is necessary to precisely control the delay length of each delay line, and the loss is relatively large.
  • the integrated grating is used to spatially separate and recombine the frequency components in the pulse, and a phase mask is used to complete the necessary pulse filtering and shaping functions.
  • This method has many disadvantages: it is too bulky, the addressing speed is slow and difficult to integrate; the dispersion is large, the transmission distance is limited; the number of users accommodated is limited (wavelength limitation).
  • the spatial light modulator ie, the optical mask
  • the spatial light modulator needs to be made very fine, and it is difficult to implement codeword reconstruction.
  • Time domain/local 2D coding based on fiber Bragg grating consists of a series of FBGs with different center wavelengths.
  • the reflection wavelength of each grating center can be adjusted by the piezoelectric ceramic device to adjust the grating period to achieve wavelength coding.
  • the position acts as a fiber delay line, which separates the different frequency components in the time domain, thereby implementing time domain/heritive hybrid coding.
  • Figure 2 shows the FBG encoder/decoder in series.
  • Each encoder/decoder consists of several FBGs with different reflection wavelengths connected in series.
  • the incident light pulse is encoded by the optical circulator 21 and the encoded FBG 22, and a pulse sequence is formed in the time domain.
  • the pulse sequences are compressed again, and a pulse is recombined.
  • the code/decoder implementation is relatively simple, but the code length of the address code is limited by the number of FBGs.
  • FBG has a broadening effect on optical pulses and is difficult to use for high-speed communication above lGbps.
  • An arrayed waveguide grating (AWG) based encoder/decoder as shown in Figure 3, Figure 3 is a two-dimensional time domain/local register based on AWG31, and Figure 4 is a one-dimensional spectral domain encoder/decoder based on AWG41.
  • the AWG-based encoder/decoder can solve the code length limitation and rate limitation of the FBG encoder and is easy to integrate.
  • the AWG-based one-dimensional encoder/decoder is similar to the one-dimensional time domain parallel encoder/decoder, and the codeword reconstruction can be performed by adding a codeword controller.
  • AWG-based 2D time domain/language encoder/decoder which is a parallel structure compared to FBG-based encoder/decoder.
  • AWG demultiplexer makes full use of the characteristics of AWG demultiplexer and adds different AWG different output wavelengths.
  • the delay length of the fiber delay is extended in the time domain, thereby achieving the purpose of two-dimensional coding.
  • AWG encoder/decoder is not compared to FBG structure Reflex is required, and the delay length of its corresponding delay line is also twice as long as the FBG structure.
  • the above two AWG-based encoder/decoders require two AWG devices, which makes the entire encoder/decoder loss more, which also makes the loss budget of the entire passive optical network system larger, which is not conducive to system cost control. Summary of the invention
  • the technical problem to be solved by the present invention is to provide a reconfigurable encoder/decoder and an optical code division multiple access multiplexed passive optical network based on the reconfigurable encoder/decoder to reduce loss and cost.
  • the present invention provides a reconfigurable encoder comprising an arrayed waveguide grating AWG, N tunable fiber retarders, N being an integer and ⁇ > 1 , M reflectors, M being an integer And N > M > 1,
  • the AWG has at least N input ports and N output ports, wherein: an output port of the AWG is connected to an input end of the adjustable fiber retarder, the N tunable fibers
  • the output ends of the M tunable fiber retarders in the delay are respectively connected to the M reflectors;
  • the input signal is input from the input port of the AWG, processed through the AWG, and outputted from the corresponding output port, wherein the M path
  • the output signal is delayed by the adjustable fiber retarder and reaches the reflector. After being reflected by the reflector, it is returned to the output port of the AWG through a corresponding adjustable fiber retarder, and is output from the input port of the AWG.
  • the reconfigurable encoder further includes P adapter components, P is an integer and NM > P > 1, and output ends of P adjustable fiber retarders in the N adjustable fiber retarders are respectively connected To P adapter pieces;
  • the input signal is input from the input port of the AWG, and is output from the corresponding output port after being processed by the AWG.
  • the P output signal is delayed by the adjustable fiber delay to reach the adapter, and the signal reaching the adapter is extinguished.
  • the present invention also provides a reconfigurable decoder comprising an arrayed waveguide grating AWG, N tunable fiber retarders, N is an integer and ⁇ > 1 , M reflectors, M is An integer and N > M > 1, the AWG has at least N input ports and N output ports, where:
  • An output port of the AWG is connected to an input end of the adjustable fiber retarder, and an output of the M adjustable fiber retarders in the N adjustable fiber retarders respectively and the M reflector Connected; the input signal is input from the input port of the AWG, and is output from the corresponding output port after being processed by the AWG, wherein the M-channel output is delayed by the adjustable fiber retarder and reaches the reflector, and after being reflected by the reflector, the corresponding The adjustable fiber retarder is returned to the output port of the AWG and is output by the input port of the AWG.
  • the reconfigurable decoder further comprises P adapter components, P is an integer and N-M > P
  • the output of the P adjustable fiber retarders in the N adjustable fiber retarders is connected to the adapter; the input signal is input from the input port of the AWG, processed through the AWG, and output from the corresponding output port The P output signal is delayed by the adjustable fiber delay to reach the adapter, and the signal reaching the adapter is extinguished.
  • the present invention also provides an optical line terminal (OLT) based on the above reconfigurable encoder and a reconfigurable decoder, the OLT comprising an optical transmitter, a first optical circulator, and a second Optical circulator, third optical circulator, reconfigurable encoder, coupler, optical receiver, reconfigurable decoder, optical beam splitter, wherein:
  • the data to be transmitted is sent to the reconfigurable encoder through the optical transmitter and the first optical circulator for encoding, and the encoded data is sent to the coupler via the first optical circulator, and the coupler will receive from the plurality of optical transmitters. After the data to be transmitted is coupled, the data is output through the second optical circulator;
  • the second optical circulator receives the data and sends it to the optical beam splitter.
  • the optical beam splitter divides the data into multiple channels, each of which is sent to a third optical circulator, and the third optical circulator.
  • the data is sent to a reconfigurable decoder for decoding, and the decoded data is sent to the optical receiver via the third optical circulator.
  • the reconfigurable encoder and the reconfigurable decoder each have one, and the optical transmitter, the first optical circulator, the optical receiver, and the third optical circulator respectively have a plurality of Or the number is equal; or, the optical transmitter, the first optical circulator, the reconfigurable encoder, the optical receiver, the third optical circulator, and the reconfigurable There are multiple decoders and the number is equal.
  • the present invention also provides an optical network unit (ONU) based on the above reconfigurable encoder and a reconfigurable decoder, where the ONU includes an optical transmitter, an optical receiver, an optical circulator, a coupler, a reconfigurable encoder, a reconfigurable decoder, wherein: the reconfigurable encoder, the reconfigurable decoder, and the coupler are connected to the optical circulator, the optical transmitter, the optical receiver Connected to the coupler; After receiving the optical signal sent by the optical line terminal OLT, the optical circulator sends the optical signal to the reconfigurable decoder for decoding, and the decoded data is output from the optical circulator to the coupler. Output to the optical receiver via the coupler;
  • the optical transmitter sends the data to be transmitted to the coupler, and is sent by the coupler to the optical circulator, and sent by the optical circulator to the reconfigurable encoder for encoding, the encoded data. Output by the optical circulator.
  • the optical transmitter comprises a reflective semiconductor optical amplifier RSOA or a Fabry-Perot laser FPLD; after the optical signal reaches the coupler, the coupler is split into two paths, one output to the optical receiver, and the other output to the optical receiver.
  • the optical transmitter uses the received input light as an uplink optical carrier, and carries the to-be-transmitted data on the uplink optical carrier for transmission.
  • the present invention also provides an optical code division multiple access multiplexed passive optical network based on the above reconfigurable encoder and reconfigurable decoder, including an optical line terminal (OLT) and optical wiring.
  • OLT optical line terminal
  • ODN Optical Network Unit
  • ONU Optical Network Unit
  • the OLT includes an optical transmitter, a first optical circulator, a second optical circulator, a third optical circulator, a reconfigurable encoder, a coupler, an optical receiver, a reconfigurable decoder, and an optical beam splitter.
  • the data to be transmitted is sent to the reconfigurable encoder through the optical transmitter and the first optical circulator for encoding
  • the encoded data is sent to the coupler via the first optical circulator, and the coupler will transmit from multiple lights.
  • the data to be transmitted received by the machine is coupled and outputted by the second optical circulator;
  • the second optical circulator receives the data and sends it to the optical beam splitter, and the optical beam splitter divides the data into multiple channels, each of which is sent a third optical circulator, the third optical circulator sends the data to a reconfigurable decoder for decoding, and the decoded data is sent to an optical receiver via a third optical circulator;
  • the ONU includes an optical transmitter, an optical receiver, an optical circulator, a coupler, a reconfigurable encoder, and a reconfigurable decoder, where: when the optical circulator receives the optical signal sent by the OLT, Transmitting the optical signal to the reconfigurable decoder for decoding, the decoded data is output from the optical circulator to the coupler, and output to the optical receiver via the coupler; when the uplink data is to be transmitted, the light is emitted
  • the machine sends the data to be sent to the coupler, and is sent by the coupler to the optical circulator, and is sent by the optical circulator to the reconfigurable encoder for encoding, and the encoded data is output by the optical circulator.
  • the reconfigurable encoder and the reconfigurable decoder each have one, Each of the optical transmitter, the first optical circulator, the optical receiver, and the third optical circulator has a plurality of equal numbers; or the optical transmitter and the first optical ring Each of the row, the reconfigurable encoder, the optical receiver, the third optical circulator, and the reconfigurable decoder has an equal number; and in the ONU, the The optical transmitter comprises a reflective semiconductor optical amplifier RSOA or a Fabry-Perot laser FPLD; after the optical signal reaches the coupler, it is split into two paths through the coupler, one output to the optical receiver, and the other output to the optical transmitter; When the uplink data is to be sent, the optical transmitter uses the received input light as an uplink optical carrier, and carries the to-be-transmitted data on the uplink optical carrier for transmission.
  • RSOA reflective semiconductor optical amplifier
  • Fabry-Perot laser FPLD Fabry-Perot laser
  • the reconfigurable encoder/decoder of the present invention solves the problem of large loss of the encoder/decoder of the conventional AWG by using only one AWG device, and greatly reduces the cost.
  • the reconfigurable encoder/decoder utilizes multiple incident ports of the AWG, multiple sets of inputs can be encoded or decoded simultaneously, enabling time domain and spectral domain hybrid coding.
  • the codeword reconstruction of the encoder/decoder increases the flexibility and confidentiality of the network.
  • the invention is based on the above-mentioned reconfigurable encoder/decoder optical code division multiple access passive optical network (OCDMA PON), which can solve the problem that the code length of the passive optical network using the FBG as the encoder is limited (the number of multiplexed users can be affected) Limited) and limited communication rate.
  • OCDMA PON optical code division multiple access passive optical network
  • the OLT based on the reconfigurable codec can implement multiple reconfigurable encoder/decoders for multiple users by using multiple incident ports of the AWG, which simplifies the structure of the OLT and saves network cost; Reconstructing the ONU of the encoder/decoder, due to the full use of the RSOA feature in the structure, the laser light source, the modulator and the like which must be used in the original optical transmitter can be reduced, the ONU structure is simplified, and the network cost is saved.
  • Figure 1 is a block diagram of an OCDMA-PON passive optical network
  • FBG fiber Bragg grating
  • Figure 3 is a two-dimensional time domain/spectral domain codec/decoder diagram based on AWG;
  • 4 is a one-dimensional encoder/decoder diagram based on AWG; 5 is a structural diagram of an AWG-based reconfigurable encoder;
  • FIG. 6 is a structural diagram of an AWG-based reconfigurable decoder
  • FIG. 7 is an OLT structure diagram of an optical code division multiple access multiplexed passive optical network based on a reconfigurable encoder/decoder according to the present invention (in the case of M>1);
  • FIG. 9 is a structural diagram of an ONU of an optical code division multiple access multiplexed passive optical network based on a reconfigurable encoder/decoder according to the present invention. Preferred embodiment of the invention
  • the invention provides a reconfigurable encoder comprising an arrayed waveguide grating (AWG), N tunable fiber retarders and M reflectors, wherein N and M are integers and ⁇ > 1 , N > M > 1
  • the AWG has at least N input ports and N output ports, where:
  • An output port of the AWG is connected to an input end of the adjustable fiber retarder, an output end of the adjustable fiber retarder is connected to the reflector; an input signal is input from the AWG input port, and processed by the AWG Output from the corresponding output port, each output is delayed by the adjustable fiber retarder, reaches the reflector, is reflected by the reflector, and returned to the output port of the AWG through the corresponding adjustable fiber retarder, by the AWG Input port output.
  • the reconfigurable encoder further comprises P adapter members, P is an integer and NM > P > 1, and an output of the M adjustable fiber retarders of the N adjustable fiber retarders is connected to The reflector, the output of the P adjustable fiber retarder is connected to the adapter; the input signal is input from the AWG input port, processed by the AWG, and outputted from the corresponding output port, and the output signal is delayed by the adjustable fiber delay
  • the signal reaching the reflector is reflected by the reflector, returned to the output port of the AWG through the corresponding adjustable fiber retarder, and outputted by the input port of the AWG; the signal reaching the adapter member is Extinction (will not reflect back).
  • the invention provides a reconfigurable decoder comprising an arrayed waveguide grating (AWG), N Adjustable fiber retarder, N is an integer and ⁇ > 1, M reflectors, M is an integer and N > M > 1, the AWG has at least N input ports and N output ports, where:
  • An output port of the AWG is connected to an input end of the adjustable fiber retarder, an output end of the adjustable fiber retarder is connected to the reflector; an input signal is input from the AWG input port, and processed by the AWG Output from the corresponding output port, each output is delayed by the adjustable fiber retarder, reaches the reflector, is reflected by the reflector, and returned to the output port of the AWG through the corresponding adjustable fiber retarder, by the AWG Input port output.
  • the reconfigurable decoder further includes P adapter components, P is an integer and NM > P > 1, and outputs of the M tunable fiber delays of the N tunable fiber delays are connected to The reflector, the output of the P adjustable fiber retarder is connected to the adapter; the input signal is input from the AWG input port, processed by the AWG, and outputted from the corresponding output port, and the output signal is delayed by the adjustable fiber delay
  • the signal reaching the reflector is reflected by the reflector, returned to the output port of the AWG through the corresponding adjustable fiber retarder, and outputted by the input port of the AWG; the signal reaching the adapter member is Extinction (will not reflect back).
  • the adapter member may be an isolator, an attenuating fiber or the like, which is arranged to attenuate the input light, thereby consciously filtering out some wavelengths of light to prevent light reflection from affecting the encoding/decoding.
  • the tunable fiber retarder is preferably a tunable fiber delay line.
  • signal reflection for different wavelengths can be realized, that is, different codewords can be generated, different register codes can be realized, and codeword reconstruction can be realized.
  • the reconfigurable encoder/decoder of the present invention is an arrayed waveguide grating (AWG) based encoder/decoder, and the reconfigurable AWG of the present invention is compared to a conventional arrayed waveguide grating (AWG) encoder/decoder.
  • the encoder/decoder uses only one AWG device.
  • the AWG uses multiple input ports to receive data, and can simultaneously encode/decode M data.
  • the use of only one AWG device solves the problem of large encoder/decoder loss of conventional arrayed waveguide gratings (AWGs).
  • the optical encoder/decoder is a core component of the OCDMA-PON system. At the transmitting end, the optical encoder converts the data bits into a code sequence, and the optical decoder at the receiving end recovers the code sequence into data bits using the correlation decoding principle. The structure and characteristics of the optical encoder/decoder directly affect the overall performance of the system.
  • the reconfigurable encoder/decoder in the present invention is an AWG-based reconfigurable encoder/decoder.
  • the optical encoder/decoder is fully profitable
  • the cycle characteristics of the AWG are used.
  • the cycle characteristic of AWG means that the wavelength of the output of different input ports at the corresponding output port is cyclic.
  • i ⁇ ⁇ i ⁇ M
  • j 1 ⁇ j ⁇ N
  • Port, N indicates the total number of wavelengths used.
  • the output port output wavelength is ⁇ 4,4, ⁇ 4 , ... ⁇
  • the output port output wavelength is ⁇ , ⁇ 4 , . . ⁇ , ⁇ , and so on.
  • the AWG-based reconfigurable encoder/decoder controls the selected reflected wavelength by controlling the connection of the reflector behind the fiber retarder or the adapter, so that each encoding/decoding does not utilize all wavelengths, but only Several wavelengths returned by the reflector are utilized.
  • N is the total number of wavelengths available for the AWG
  • the reflected wavelengths are recombined after different delays, thereby achieving two-dimensional encoding in the time domain and the spectral domain. In this way, different spectral domain coding can be realized by selecting different reflection wavelengths, that is, realizing codeword reconstruction.
  • the AWG-based reconfigurable encoder/decoder has the structure shown in Figures 5 and 6, and is mainly composed of the AWG51 of the port, the adjustable fiber retarder 52, the adapter member and the reflector.
  • the N output ports of the AWG of the MxN port are connected to N adjustable fiber retarders, but only after the K adjustable fiber retarders are connected to the reflector (ie, K reflection wavelengths are selected, ⁇ ⁇ ⁇ , , the remaining NK adjustable fiber retarders are connected to the adapter (ie, extinction of the remaining NK wavelength to prevent its reflection from affecting the encoding/decoding).
  • the AWG-based optical encoder/decoder is a parallel structure that utilizes the good spectral characteristics of the AWG.
  • Wavelength segmentation of the source pulse adding different fiber retarders at different output wavelengths, and performing time domain coding, so that both the spectral domain and the time domain are encoded, thereby implementing direct sequence (DS) code division multiple access.
  • DS direct sequence
  • FE Frequency Code
  • FE-OCDMA spectral domain code division multiple access system
  • the delay length of the fiber retarder is such that the sum of the delay lengths of the fiber delays of the respective encoders and decoders is equal; changing the fiber retarder
  • the connected reflector and adapter must simultaneously change the encoder and decoder of the same receive and transmit link in the OLT and ONU.
  • the user data source pulse enters the AWG input port through the optical circulator, and the AWG wavelength-divides it, and outputs different wavelengths of light pulses at different output ports, that is, the language is encoded/decoded, and the pulse after dividing the wavelength is different.
  • the delay length of the fiber retarder that is, the time domain encoding/decoding
  • the reflector is used to reflect the pulse back to the AWG, and the pulse is returned to the AWG after a delay of different length, and finally output through the optical circulator to obtain the final editing. / Decode data.
  • the optical transmitter is set to carrier modulation
  • the reconfigurable encoder/decoder is set to encode/decode
  • the coupler is set to data coupling
  • the optical receiver is set to carrier demodulation
  • the optical beam splitter is set to data split.
  • An optical transmitter, an optical circulator and a reconfigurable encoder are coupled to the coupler to form a data transmission link structure, and the data to be transmitted is transmitted through the optical transmitter and the first optical circulator (optical circulator A in the figure)
  • the data is sent to the reconfigurable encoder for encoding, and the encoded data is sent to the coupler through another output port of the first optical circulator.
  • An optical receiver, an optical circulator and a reconfigurable decoder are connected to the optical beam splitter to form a data receiving link structure.
  • the optical beam splitter After receiving the data, the optical beam splitter divides the data into multiple channels, each of which is sent Up to a third optical circulator (optical circulator C in the figure), the third optical circulator sends the data to a reconfigurable decoder for decoding, and the decoded data is passed through a third optical circulator An output port is sent to the optical receiver.
  • the coupler and the optical beam splitter are connected via a second optical circulator (optical circulator B in the figure), which are respectively connected to the optical circulator ports 1, 3; the second optical circulator port 2 is an output end of the OLT.
  • the coupler couples the data to be transmitted received from the plurality of optical transmitters and outputs them via the second optical circulator; the second optical circulator is further configured to be sent to the optical beam splitter after receiving the data.
  • Transmission fibers are used to connect between the above devices.
  • the OLT is connected to one or more ONUs via an ODN. The number of the above optical transmitter, first optical circulator, reconfigurable encoder, optical receiver, third optical circulator, and reconfigurable decoder is equal.
  • the optical transmitter 1 modulates the downlink data stream to the carrier light source, and then inputs it to the optical circulator A1 port 1, and the optical circulator A1 port 2 output, encoded by the reconfigurable encoder, then passed through the end of the optical circulator A1 After port 2, it is output by optical circulator A1 port 3, and finally input to the coupler.
  • the multi-coded data stream is coupled by the coupler, it enters port 1 of optical circulator B, and finally outputs from port 2 of optical circulator B, and then transmits it to the ONU or ONT through the optical fiber.
  • the data stream is decoded by the optical decoder.
  • the decoder must be in one-to-one correspondence with the encoder in the OLT, so that the data can be recovered for reception at the user end.
  • the encoded data stream transmitted by the ONU enters the port 2 of the optical circulator B, is output from the port 3 of the optical circulator B, and is split by the optical beam splitter to enter each data stream.
  • the data stream that is assigned to this link enters through port 1 of the optical circulator C1, and is output from the port 2 of the optical circulator C1 to enter the reconfigurable decoding.
  • the decoder performs decoding, and the decoded signal is output from the terminal 3 of the optical circulator C1 and finally received by the optical receiver 1.
  • the resulting recovered data stream signal is finally uploaded to the core network.
  • M > 1 Another structure (M > 1) of the OLT based on the above reconfigurable encoder/decoder is shown in Fig. 8.
  • the M data transmission/reception links share an MxN port-based AWG reconfigurable encoder 81 and a reconfigurable decoder 82, which simplifies the structure of the OLT and saves the network cost.
  • the structure of the ONU is as shown in FIG. 9.
  • the ONU is mainly composed of an optical transmitter 91, an optical receiver 92, an optical circulator (optical circulator D in the figure) 93, a coupler 94, a reconfigurable encoder 95, and
  • the reconstruction decoder 96 is composed of, wherein the optical transmitter comprises a reflective semiconductor optical amplifier (RSOA).
  • RSOA reflective semiconductor optical amplifier
  • the optical circulator D, the reconfigurable decoder, the coupler and the optical receiver are connected to form a data receiving link structure; when the optical circulator D receives the data sent by the OLT, the data is sent to the reconfigurable decoder.
  • the decoded data is divided into two paths from the other output port of the optical circulator D through the coupler, one output to the optical receiver, and the other output to the optical transmitter.
  • the optical circulator D, the reconfigurable encoder, the coupler, and the optical transmitter constitute a data transmission link structure; when the data is to be uplinked, the optical transmitter receives the input data to be transmitted, and then sends the signal to the coupling.
  • the device is sent to the optical circulator D by the coupler, and is sent by the optical circulator D to the reconfigurable encoder for encoding, and the encoded data is output by the other output port of the optical circulator D.
  • Transmission fibers are used to connect between the above devices.
  • the i-th ONU is taken as an example and transmitted from the OLT.
  • the encoded data stream is input to port 1 of optical circulator D, output from port 2 of optical circulator D, decoded by a reconfigurable decoder, and output from port 3 of optical circulator D for final recovery.
  • the outgoing data stream is split into two paths by the coupler, one is received by the optical receiver, and the other is received by the RSOA (used as uplink remodulation).
  • the ONU When the ONU processes the uplink data, the final recovered data stream of the downlink is received by the optical receiver through a part of the coupler, and a part of the data stream is received by the RSOA.
  • the RSOA receives the data to be transmitted, and the RSOA uses part of the downlink signal light as the uplink optical carrier, and then uplinks.
  • the signal is modulated onto the optical carrier, returned to the coupler, and then enters the optical circulator D port 3.
  • the optical circulator D port 4 enters the reconfigurable encoder for encoding, and then is output by the optical circulator D port 1 and transmitted through the ODN. Go to the OLT.
  • the RSOA can not only amplify the optical signal, but also modulate the optical signal.
  • the modulation is uplink remodulation, that is, part of the downlink signal light is used as an uplink optical carrier, and then the uplink signal is modulated onto the optical carrier.
  • the ONU utilizes the uplink remodulation function of the RSOA to save a light source and a modulator, simplifying the structure of the ONU and reducing the network cost.
  • the ONU of the present invention is a wavelength-independent device, and the wavelength at the time of uplink transmission is determined by the wavelength of the downlink optical carrier.
  • FPLD Bulb-Perot laser
  • the optical encoder is similar in structure to the optical decoder (AWG, tunable fiber retarder and reflector), and the difference between the two is that the delay length of the fiber retarder of the corresponding wavelength is different, and Complementary, that is, the sum of the lengths of delays of the tunable fiber delays of the encoder and the decoder at the respective wavelengths is constant, and the sum of the delay lengths of the tunable fiber retarders of the different wavelengths of the encoder and the decoder is equal.
  • the sum of the delay lengths of the two tunable fiber retarders 1 in Figures 5 and 6 is equal to the sum of the delay lengths of the two tunable fiber retarders K.
  • the above-mentioned reconfigurable codec-based OLT and ONU together with ODN constitute a reconfigurable encoder/decoder based OCDMA PON, and the OCDMA PON according to the present invention can provide better by using a reconfigurable AWG encoder/decoder.
  • Optical code division multiple access multiplexed passive optical network performance Enhance network flexibility and confidentiality.
  • the reconfigurable encoder/decoder provided by the present invention can solve the problem of large loss of the encoder/decoder of the conventional AWG by using only one AWG device, and greatly reduce the cost; the present invention provides based on the reconfigurable/ The optical line terminal OLT of the decoder realizes that a plurality of users share a reconfigurable encoder/decoder by using multiple incident ports of the AWG, which simplifies the structure of the OLT and saves network cost;
  • the optical network unit ONU of the structure/decoder makes full use of the characteristics of RSOA in the structure, reduces the laser light source, modulator and other devices that must be used in the original optical transmitter, simplifies the ONU structure, and is more conducive to saving network cost.
  • optical code division multiple access multiplexed passive optical network the optical code division multiple access passive optical network (OCDMA PON) based on the above reconfigurable encoder/decoder provided by the invention can solve the passive use of FBG as an encoder
  • the optical network has a limited code length and limited communication rate, which enhances network performance.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)

Abstract

La présente invention concerne un codeur/décodeur, un terminal de ligne optique ou "OLT" (Optical Line Terminal), une unité de réseau optique ou "ONU" (Optical Network Unit), et un réseau optique passif de type "OCDMA-PON", c'est-à-dire un réseau optique passif en accès multiple à division de code optique (Optical Code Division Multiple Access Passive Optical Network). Le codeur reconfigurable comprend: un réseau de guide d'ondes à compression et entrelacement ou "AWG" (Arrayed Waveguide Grating), un nombre N de retardateurs réglables pour fibres optiques, "N" étant un entier tel que N≥1, un nombre M de réflecteurs, "M" étant un entier tel que N≥M≥1, et le réseau AWG comportant N ports d'entrée et N ports de sortie au moins. Les ports de sortie du réseau AWG sont connectés à l'entrée des retardateurs réglables pour fibres optiques dont les sorties sont connectées aux réflecteurs. Le signal d'entrée est fourni en entrée à partir des ports d'entrée du réseau AWG, et les sorties des ports de sortie correspondants une fois qu'ils ont été traités par le réseau AWG. Enfin, chaque signal de sortie atteint les réflecteurs après avoir été retardé par le retardateur réglable pour fibre optique, puis revient au port de sortie du réseau AWG par l'intermédiaire du retardateur réglable pour fibre optique après avoir été renvoyé par le réflecteur. La solution technique de la présente invention permet de réduire la consommation et les coûts.
PCT/CN2010/076304 2010-04-23 2010-08-24 Codeur-décodeur reconfigurable, et réseau optique passif ocdma-pon mettant en œuvre un tel codeur-décodeur WO2011130985A1 (fr)

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CN106059703B (zh) * 2016-07-22 2018-06-29 广西师范大学 基于ocdma二维电光编解码的局端收发装置及其编解码方法
WO2018068205A1 (fr) * 2016-10-11 2018-04-19 华为技术有限公司 Procédé et appareil de démultiplexage permettant un multiplexage par répartition en code
CN106533564B (zh) * 2016-11-25 2019-04-05 通号工程局集团北京研究设计实验中心有限公司 一种基于波长编码的多波长数字光通信系统
CN109104249A (zh) * 2018-09-26 2018-12-28 中国电子科技集团公司第三十八研究所 一种基于光纤反射镜的多波长光信号延时网络
CN112054871B (zh) * 2020-09-08 2022-11-29 东南大学 一种具有链路监测功能的wdm-pon远端分路节点

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