WO2015135296A1 - 一种基于光梳的roadm上下路收发的系统、方法及终端 - Google Patents

一种基于光梳的roadm上下路收发的系统、方法及终端 Download PDF

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Publication number
WO2015135296A1
WO2015135296A1 PCT/CN2014/085130 CN2014085130W WO2015135296A1 WO 2015135296 A1 WO2015135296 A1 WO 2015135296A1 CN 2014085130 W CN2014085130 W CN 2014085130W WO 2015135296 A1 WO2015135296 A1 WO 2015135296A1
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WIPO (PCT)
Prior art keywords
add
drop
signal
module
local oscillator
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PCT/CN2014/085130
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English (en)
French (fr)
Inventor
李巨浩
牛雒平
何永琪
周伟勤
沈百林
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中兴通讯股份有限公司
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Priority to EP14885771.7A priority Critical patent/EP3119017A4/en
Publication of WO2015135296A1 publication Critical patent/WO2015135296A1/zh

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    • 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
    • H04J14/0213—Groups of channels or wave bands arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60—Receivers
    • H04B10/61—Coherent receivers
    • H04B10/65—Intradyne, i.e. coherent receivers with a free running local oscillator having a frequency close but not phase-locked to the carrier signal
    • 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
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0256—Optical medium access at the optical channel layer

Definitions

  • the present invention relates to the field of optical fiber communication, and more particularly to a system and method for transmitting and receiving an optical fiber comb-based reconfigurable optical add/drop multiplexer (ROADM) And terminal.
  • ROADM reconfigurable optical add/drop multiplexer
  • variable bandwidth optical networks has been proposed in the industry in recent years. It overcomes the limitations of coarse-grained and fixed-grid of traditional wavelength division multiplexing (WDM) optical networks, and can allocate bandwidth resources dynamically and flexibly. Carrying service requirements from sub-wavelength level to super-wavelength level greatly improves spectrum resource utilization.
  • WDM wavelength division multiplexing
  • implementing variable bandwidth optical networks includes two key technologies: variable rate transceivers, variable bandwidth optical switching. Among them, the former is that Orthogonal Frequency Division Multiplexing (OFDM) technology is introduced into the field of optical transmission, and the key of the latter is that the new variable bandwidth optical switching device is used for all-optical switching of nodes.
  • OFDM Orthogonal Frequency Division Multiplexing
  • OFDM is a multi-carrier modulation technique that transmits high speed data streams over multiple low speed orthogonal subcarriers.
  • OFDM has a spectrum overlap between subcarriers due to orthogonality between subcarriers, and does not need to protect bandwidth, thereby greatly improving spectrum utilization.
  • OFDM technology has greatly promoted the development of optical transmission technology. At present, the transmission rate of single channel can reach more than 1 Tb/s.
  • optical OFDM technology also has the characteristics of chromatic dispersion (CD) and anti-polarization mode dispersion (PMD).
  • Optical OFDM technology uses a multi-carrier multiplexing mechanism and supports adaptive modulation format selection, thus enabling multi-data rate bearers and supporting bandwidth allocation from sub-wavelength to super-wavelength.
  • variable rate transceivers can be implemented. The main methods include adjusting the number of electronic carriers, adjusting the number of photonic bands, changing the modulation format, and so on.
  • ROADMs Reconfigurable Optical Add/Drop Multiplexers
  • the ROADM completes the optical channel's add/drop (Add/Drop) on one node and the wavelength level cross-scheduling between the optical channels. It remotely controls the ROADM subsystem in the network to implement the configuration and adjustment of the upstream and downstream wavelengths, allowing the network to have flexible multi-wavelength or full-wavelength insertion and division without manual configuration or expensive and energy-consuming OEO converters.
  • FIG. 1 is a schematic diagram of a typical structure of a conventional ROADM. As shown in FIG.
  • the core functional modules of the ROADM include: a switching node monitoring module and an uplink and downlink terminal (the connection configuration of the PS and the WSS in the upper and lower transceiver terminals can be adjusted. Does not affect the actual use of ROADM).
  • the typical structure of the switching node monitoring module is the splitter+WSS structure, which implements the wavelength switching function between the ingress and egress ports.
  • the uplink and downlink terminals are composed of the wavelength cross-connecting part and the client transceiver, so that the node uplink service is selected and sent and joined to the network node and the lower node. The road service is received from the network node.
  • the road type is a ROADM based on a wavelength blocker.
  • the module has a wide passband, supports a high number of lanes and a narrow channel spacing, but has a large number of components, high cost of the occluder, and limited functionality.
  • the next type is a ROADM based on an integrated planar waveguide circuit, which is highly integrated, compact, reliable, and fast. The disadvantage is that the design is difficult, expensive, and has a small working range, large PMD, wavelength-dependent loss (WDL), and narrow bandwidth.
  • WDL wavelength-dependent loss
  • Figure 1 shows a ROADM based on splitter and wavelength selective switch (WSS), which is the third ROADM implementation.
  • WSS wavelength selective switch
  • an embodiment of the present invention discloses a CAM-based uplink and downlink transmission and reception system and method based on optical comb and a terminal. It can greatly simplify the ROADM uplink and downlink transceiver system, realize system cost reduction and simplify management and control methods.
  • an embodiment of the present invention provides a system for transmitting and receiving a ROADM of a reconfigurable optical add/drop multiplexer based on an optical comb, including: a control platform, an uplink transmitting terminal, a switching node monitoring module, and a downlink Receiving terminal; wherein
  • the control platform is configured to send the uplink control signaling to the uplink carrier module and the downlink control signaling to the downlink local oscillator module;
  • the uplink sending terminal includes: an uplink carrier module, an uplink selection module, an IQ modulation module, and a combining module;
  • the downlink receiving terminal includes: a power splitter, a downlink local oscillator module, a downlink selection module, and a coherent receiver ; among them,
  • the uplink carrier module includes an uplink laser and an uplink carrier device, and the uplink carrier module is configured to: set the uplink carrier device according to the received uplink management signaling, so that the uplink laser passes the uplink carrier device Generating the required uplink carrier signal;
  • the uplink selection module is configured to select an M-channel carrier signal according to the uplink control signaling, and output to the M IQ modulation modules respectively;
  • the IQ modulation module is configured to perform signal modulation on the received uplink carrier signal and send the signal to the combining module;
  • the combining module is configured to perform carrier combining on the M-channel carrier signal modulated by the IQ, and send the signal to the switching node monitoring module;
  • the switching node monitoring module is configured to send the received combined signal to the power splitter;
  • the power splitter is configured to receive a combined signal of the switching node monitoring module, and the power splitting succeeds in splitting the signal To the N-channel coherent receiver;
  • the lower local oscillator module includes a lower laser and a lower local oscillator, and the lower local oscillator module is configured to set the lower local oscillator according to the received lower routing control signaling, so as to The lower path laser generates the required local oscillation signal through the down-channel local oscillator device;
  • the downlink selection module is configured to select N local oscillator signals according to downlink control signaling, and concurrently Sent to a coherent receiver;
  • the coherent receiver is configured to receive a power split signal output by the power splitter and a local oscillator signal of each path to perform demodulation processing;
  • the M is the number of signal transmission paths of the uplink transmitting terminal, and the N is the number of signal receiving paths of the downlink receiving terminal, and M and N are integers greater than or equal to 1.
  • the upper carrier device and the lower local oscillator device are optical combs.
  • the uplink selection module is: ⁇ ⁇ variable bandwidth wavelength selection switch BV-WSS; the combination module is: ⁇ 1 BV-WSS;
  • the downlink selection module is: l xN BV-WSS.
  • the combining module is further configured to attenuate the IQ modulated M-road carrier signal to power when the M-channel modulated M-channel carrier power is greater than a preset maximum output power Pmax. Equal to Pmax.
  • the embodiment of the present invention further provides an optical comb-based reconfigurable optical add/drop multiplexer ROADM uplink transmitting terminal, including: an uplink carrier module, an uplink selection module, an IQ modulation module, and a combining module;
  • the uplink carrier module includes an uplink laser and an uplink carrier device, and the uplink carrier module is configured to set the uplink carrier device according to the received uplink management signaling, so that the uplink laser is generated by the uplink carrier device.
  • the required uplink carrier signal
  • the uplink selection module is configured to select an M-channel carrier signal according to the uplink control signaling, and output to the M IQ modulation modules respectively;
  • the IQ modulation module is configured to perform signal modulation on the received uplink carrier signal and send the signal to the combining module;
  • the combining module is configured to perform carrier combining on the M-channel carrier signal modulated by the IQ, and send the signal to the switching node monitoring module;
  • the M is the number of signal transmission paths of the uplink transmitting terminal, and M is an integer greater than or equal to 1.
  • the uplink carrier device is an optical comb.
  • the uplink selection module is: ⁇ ⁇ variable bandwidth wavelength selection switch BV-WSS.
  • the combining module is further configured to attenuate the uplink carrier signal of the M channel after the IQ modulation to a power equal to when the power of the on-road carrier after the IQ modulation is greater than a preset maximum output power Pmax. Pmax.
  • the embodiment of the present invention further provides an optical comb-based reconfigurable optical add/drop multiplexer ROADM downlink receiving terminal, comprising: a power splitter, a downlink local oscillator module, a downlink selection module, and a coherent receiver;
  • the power splitter is configured to receive a combined signal of the switching node monitoring module, and the power splitting is successfully sent to the N-channel coherent receiver;
  • the down-channel local oscillator module includes a down-channel laser and a down-channel local oscillator device, and the down-channel local oscillator module is configured to set a downlink local oscillator device according to the received downlink control signal to enable the lower
  • the road laser generates a required local oscillation signal through the lower local oscillator device;
  • the downlink selection module is configured to select an N-way local oscillator signal according to the downlink control signaling, and send the signal to the coherent receiver;
  • the coherent receiver is configured to receive a power split signal output by the power splitter and a local oscillator signal of each path to perform demodulation processing;
  • the N is the number of signal receiving paths of the downlink receiving terminal, and N is an integer greater than or equal to 1.
  • the lower local oscillator device is an optical comb.
  • the downlink selection module is: ⁇ ⁇ variable bandwidth wavelength selection switch BV-WSS.
  • the embodiment of the invention further provides a method for transmitting and receiving the ROADM of the reconfigurable optical add/drop multiplexer based on the optical comb, comprising:
  • a signal is generated by a down-channel laser and a local oscillator signal is generated by a down-channel local oscillator, According to the road control signaling, the local oscillator signal of the N channel is selected and sent to the coherent receiver; the coherent receiver receives the power component signal and the local oscillator signal and performs demodulation processing;
  • the M is the number of signal transmission paths of the uplink transmitting terminal, and the N is the number of signal receiving paths of the downlink receiving terminal, and M and N are integers greater than or equal to 1.
  • the upper carrier device and the lower local oscillator device are optical combs.
  • the uplink carrier signal of the M channel is selected according to the uplink control signaling: according to the uplink control signaling, the uplink carrier signal of the M channel is selected by the I xM variable bandwidth wavelength selection switch BV-WSS;
  • the local oscillator signal of the N channel is selected according to the downlink control signal: according to the downlink control signaling, the local oscillator signal of the N channel is selected by using 1 ⁇ BV-WSS.
  • the method further comprises: attenuating the IQ modulated M-way carrier signal to a power equal to Pmax when the IQ modulated M-channel carrier power is greater than a pre-set maximum output power Pmax.
  • the embodiment of the present invention further provides a method for transmitting a ROADM on a rewable optical add/drop optical add/drop multiplexer based on an optical comb, including:
  • the M is the number of signal transmission paths of the uplink transmitting terminal, and M is an integer greater than 1.
  • the uplink carrier device is an optical comb.
  • the uplink carrier signal of the M channel is selected according to the uplink control signaling: according to the uplink control signaling, the uplink carrier signal of the M channel is selected by the ⁇ ⁇ variable bandwidth wavelength selection switch BV-WSS.
  • the method further includes: when the IQ modulation of the M road carrier power is greater than a pre- When the maximum output power Pmax is set first, the IQ-modulated M-road carrier signal is attenuated to a power equal to Pamx.
  • the embodiment of the invention further provides a method for receiving a ROADM downlink of a reconfigurable optical add/drop multiplexer based on an optical comb, comprising:
  • a signal is generated by a down-going laser and a local oscillator signal is generated by a down-channel local oscillator device, and a local oscillator signal of the N-channel is selected according to the downlink control signal and transmitted to the coherent receiver;
  • the coherent receiver receives the power division signal and the local oscillator signal and performs demodulation processing
  • the N is the number of signal receiving paths of the downlink receiving terminal, and N is an integer greater than 1.
  • the lower local oscillator device is an optical comb.
  • the local oscillator signal of the N channel is selected according to the downlink control signaling: according to the downlink control signaling, the local oscillator signal of the N channel is selected by the ⁇ ⁇ variable bandwidth wavelength selection switch BV-WSS.
  • the embodiment of the invention realizes an uplink transmitting terminal for simplifying carrier generation, loading and synthesizing structure, and a downlink receiving terminal for generating, demodulating and receiving the local oscillator, which greatly simplifies the upper and lower transmission and reception system, reduces the complexity of the control circuit, and saves the economy.
  • the BV-WSS and increasing or decreasing the IQ modulation module of the uplink transmitting terminal and the number of coherent receivers of the downstream receiving terminal the capacity of the upper and lower roads is increased or decreased, and a flexible system expansion is realized.
  • FIG. 1 is a schematic diagram of a typical structure of a related art ROADM
  • FIG. 2 is a structural block diagram of a system for transmitting and receiving ROADM uplink and downlink based on optical comb according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a method for transmitting and receiving ROADM uplink and downlink based on optical comb according to an embodiment of the present invention.
  • a preferred embodiment of the present invention is an optical comb, also referred to herein as an optical device based on a mode-locked pulsed laser technique or a cyclic frequency shifting technique.
  • a narrow pulsed seed laser When a narrow pulsed seed laser is input, it can output a set of up to hundreds of wavelengths with discrete wavelengths, exactly equal wavelength intervals in the time domain, and consistent phase and noise characteristics.
  • the spectrum of this set of light is very similar to the comb teeth, and is spaced apart from each other exactly the same as the repetition frequency of the laser.
  • the frequency of the output light can be adjusted by controlling the input seed light.
  • a combination of a laser and an optical comb can generate hundreds of carriers for optical communication, replacing the same number of individual lasers, saving resources and energy.
  • BV-WSS bandwidth-variable wavelength-selective switch
  • LCDoS silicon-based liquid crystal
  • the switching window is flexible and tunable from fine-grained (standard WDM grids smaller than 50 GHz) to coarse-grained, and the center frequency is adjustable, thus enabling flexible and variable spectrum allocation.
  • the commercialized BV-WSS has been able to support optical switching with a 1 GHz spectral resolution and a minimum operating bandwidth of 10 GHz or less.
  • the structure of a typical variable bandwidth optical switching node monitoring module is shown in Figure 1. Optical superchannels with different bandwidths can be flexibly selected and exchanged at the nodes.
  • FIG. 2 is a structural block diagram of a system for transmitting and receiving ROADM uplink and downlink based on an optical comb according to an embodiment of the present invention; as shown in FIG. 2, the method includes: a control platform, an uplink sending terminal, a switching node monitoring module, and a downlink receiving terminal;
  • the control platform is configured to send the uplink control signaling to the uplink carrier module and the downlink control signaling to the downlink local oscillator module.
  • the uplink control command and the downlink control command are instructions generated by the existing system to receive the optical network exchange command and sent to the control platform.
  • the prior art is processed in each laser sent to the uplink and downlink signals, and the present invention is implemented. For example, you only need to send the uplink carrier module and the downlink local oscillator module for setting.
  • the uplink sending terminal includes: an uplink carrier module, an uplink selection module, an IQ modulation module, and a combined path Module; among them,
  • the uplink carrier module includes an uplink laser and an uplink carrier device, and is configured to set an uplink carrier device according to the received uplink control signaling, so that the uplink laser generates the required uplink carrier signal through the uplink carrier device.
  • the embodiment of the present invention uses an uplink laser and an uplink carrier device.
  • IQ modulation is a modulation method known in the art, that is, the data is divided into two paths, and carrier modulation is performed separately, and the two carriers are orthogonal to each other.
  • I is: in-phase (in-phase)
  • Q quadrature (quadrature).
  • the uplink selection module is configured to select the M-channel carrier signal according to the uplink control signaling, and output to the M IQ modulation modules respectively.
  • the uplink selection module is: ⁇ ⁇ variable bandwidth wavelength selection switch (BV-WSS).
  • BV-WSS variable bandwidth wavelength selection switch
  • the IQ modulation module is configured to separately modulate the M-channel carrier signal and send it to the combining module.
  • the combining module is configured to perform carrier combining on the M-channel carrier signal modulated by the IQ, and send the signal to the switching node monitoring module.
  • the combining module is: Mxl BV-WSS.
  • IQ modulation is a prior art solution and is described herein for the complete presentation of the system.
  • the combination module uses M xl BV-WSS to replace a large number of power dividers in the prior art, simplifying system design.
  • the switching node monitoring module is configured to send the received combined signal to the power splitter.
  • the downlink receiving terminal includes: a power splitter, a downlink local oscillator module, a downlink selection module, and a coherent receiver; wherein
  • the power splitter is set to receive the combined signal of the switching node monitoring module, and the power split is successfully sent to the N-channel coherent receiver.
  • the down-channel local oscillator module includes a down-channel laser and a down-channel local oscillator device, and is configured to set a down-channel local oscillator device according to the received downlink control signal to enable the lower-pass laser to generate the required local oscillator device Local oscillator signal
  • the downlink selection module selects the N local oscillator signal according to the downlink control signaling and sends it to the coherent receiver.
  • the downlink selection module is: l xN BV-WSS.
  • the coherent receiver is configured to receive the power component signal output by the power divider and the local oscillator signal of each channel for demodulation processing.
  • M is the number of signal transmission paths of the uplink transmitting terminal, and N is the number of signal receiving paths of the downlink receiving terminal, and M and N are integers greater than or equal to 1.
  • the upper carrier device and the lower local oscillator device are optical combs.
  • the uplink selection module of the embodiment of the present invention replaces the WSS in the existing network with BV-WSS, and controls the selected M path, and the combination module corresponds to the uplink selection module ⁇ ⁇ BV-WSS.
  • the ambiguous BV-WSS realizes the combination of the IQ modulated signals. Since the WSS is expensive, the improved design of the upper and lower transceiver terminals by using the BV-WSS in the embodiment of the present invention greatly reduces the development cost of the system.
  • the BV-WSS used in the downlink selection module is a 1 ⁇ BV-WSS matched with the N-way, and the system design is realized by selecting the threshold corresponding to the system.
  • On-road selection module ⁇ ⁇ BV-WSS and N-channel can be ⁇ ⁇ BV-WSS, M and N are integers of the range allowed by BV-WSS.
  • the system of the embodiment of the present invention replaces multiple WSSs with one BV-WSS because the existing ROADM uplink and downlink transceiver system uses a large number of independent lasers, and the carrier consistency generated by these lasers is worse than that of the optical comb. Therefore, more complicated management methods are needed.
  • the ROADM upper and lower transceiver system based on the optical comb uses a WSS, which simplifies the structure and simplifies the control of the generated carrier.
  • the simplified design of the upper and lower transceiver terminals is realized, and the cost is also reduced, and the design is simplified or decreased.
  • the road capacity it is not necessary to perform hardware adjustment and design on the semiconductor laser and the WSS, and only the corresponding IQ modulator for adding the corresponding signal processing in the uplink transmitting system is needed, and the coherent receiver can be added in the downstream terminal. It also greatly reduces the difficulty of system control and achieves excellent improvement of the system method.
  • the specific implementation process is: the control platform obtains monitoring data from the switching node monitoring module, and generates corresponding uplink management and control signaling and downlink management and control signaling according to the monitoring data, according to the upper pipeline
  • the control signaling performs parameter adjustment of the uplink carrier module, the uplink selection module and the combination module on the uplink transmitting terminal, and increases or decreases the number of IQ modulators; performs the downlink local oscillator module on the uplink transmitting terminal according to the downlink control signaling, Parameter adjustment of the downlink selection module, increase or decrease of the number of coherent receivers;
  • the principle of the downlink receiving terminal is similar to that of the uplink transmitting terminal, and some principles are not repeated.
  • BV-WSS parameter setting and increase or decrease the corresponding IQ modulator;
  • the downlink receiving device only need to adjust the parameter setting of l xN BV-WSS and the number of coherent reception (or select a coherent receiver that can adjust the number of signal channels, Simply adjust the number of signal paths).
  • the combining module of the embodiment of the present invention is further configured to attenuate the IQ-modulated M-channel carrier signal when the IQ-modulated M-channel carrier power is greater than a preset maximum output power (Pmax) Attenuate to Pmax.
  • Pmax preset maximum output power
  • An optical comb-based reconfigurable optical add/drop multiplexer ROADM uplink transmitting terminal includes: an uplink carrier module, an IQ modulation module, a selection module, and a combining module;
  • the uplink carrier module includes an uplink laser and an uplink carrier device, and is configured to set an uplink carrier device according to the received uplink control signaling, so that the uplink laser generates the required uplink carrier signal through the uplink carrier device.
  • the uplink carrier device is an optical comb.
  • the uplink selection module is configured to select the M-channel carrier signal according to the uplink control signaling, and output to the M IQ modulation modules respectively.
  • the way-up selection module is: l xM BV-WSS.
  • the IQ modulation module is configured to separately modulate the M-channel carrier signal and send it to the combining module.
  • the combining module is configured to perform carrier combining on the M-channel carrier signal modulated by the IQ, and send the signal to the switching node monitoring module.
  • M is the number of signal transmission paths of the uplink transmitting terminal.
  • the combining module is further configured to: when the M-channel carrier power after the IQ modulation is greater than a preset maximum output power (Pmax), attenuating the uplink carrier signal of the M-channel after IQ modulation, so that the power is attenuated to Pmax.
  • An optical comb-based reconfigurable optical add/drop multiplexer ROADM downlink receiving terminal comprises: a power splitter, a downlink local oscillator module, a downlink selection module and a coherent receiver; wherein
  • the power splitter is set to receive the combined signal of the switching node monitoring module, and the power split is successfully sent to the N-channel coherent receiver.
  • the down-channel local oscillator module includes a down-channel laser and a down-channel local oscillator device, and is configured to set a down-channel local oscillator device according to the received downlink control signal to enable the lower-pass laser to generate the required local oscillator device Local oscillator signal.
  • the lower local oscillator device is an optical comb.
  • the downlink selection module selects the N local oscillator signal according to the downlink control signal and sends it to the coherent receiver.
  • the downlink selection module is: l xN BV-WSS.
  • the coherent receiver is configured to receive the power component signal output by the power divider and the local oscillator signal of each channel for demodulation processing.
  • N is the number of signal reception paths of the downlink receiving terminal.
  • the lower management and control instructions are: instructions directly set by the management platform or obtained by the management platform based on the monitoring information of the switching node monitoring module.
  • FIG. 3 is a flow chart of a method for transmitting and receiving ROADM uplink and downlink based on an optical comb according to an embodiment of the present invention. As shown in FIG. 3, the method includes:
  • Step 300 Pass a signal generated by an uplink laser through an uplink carrier device to generate an uplink carrier signal required by the uplink transmitting terminal, and select an uplink carrier signal of the M channel according to the uplink control signaling.
  • the uplink carrier signal of the M path is selected according to the uplink control signaling: according to the uplink control signaling, the uplink carrier signal of the M path is selected by l xM BV-WSS.
  • Step 301 Perform IQ modulation on each of the uplink carrier signals of the M channel, and perform the carrier combining of the IQ modulated uplink carrier signals to the switching node monitoring module.
  • the IQ modulated uplink carrier signal is combined into a carrier: the IQ modulated uplink carrier signal is used for carrier combining by Mxl BV-WSS; Step 302: The power split signal is processed by the combined signal outputted by the switching node monitoring module to generate a power split signal and sent to the coherent receiver.
  • Step 303 Generate a signal from a downlink laser and generate a local oscillator signal through a downlink local oscillator device, select a local oscillator signal of the N channel according to the downlink control signaling, and send the local oscillator signal to the coherent receiver.
  • the local oscillator signal of the N channel is selected as follows: According to the lower management and control signal of the control platform, the local oscillator signal of the N channel is selected by l xN BV-WSS.
  • Step 304 The coherent receiver receives the power division signal and the local oscillator signal and performs demodulation processing.
  • the upper carrier device and the lower local oscillator device in step 300 and step 303 are optical combs.
  • the IQ modulated M-channel carrier signal is attenuated to attenuate its power to Pmax.
  • An optical comb-based reconfigurable optical add/drop multiplexer ROADM uplink transmission method comprising: passing a signal generated by an uplink laser through an uplink carrier device to generate an uplink carrier signal required by an uplink transmitting terminal; Signaling selects the uplink carrier signal of the M path.
  • the uplink carrier device is an optical comb.
  • the uplink carrier signal of the M channel is selected according to the uplink control signaling: according to the uplink control signaling, the uplink carrier signal of the M channel is selected by using l xM BV-WSS;
  • the uplink carrier signals of the M channels are respectively IQ modulated, and the IQ modulated uplink carrier signals are combined and transmitted to the switching node monitoring module.
  • M is the number of signal transmission paths of the uplink transmitting terminal.
  • the IQ-modulated M-route carrier signal is attenuated to attenuate its power to Pmax.
  • An optical comb-based reconfigurable optical add/drop multiplexer ROADM downlink receiving method includes: processing a combined signal outputted by a switching node monitoring module to generate a power dividing signal and transmitting the signal to a coherent receiver.
  • a signal is generated by a down-channel laser and a local oscillator signal is generated by a down-channel local oscillator device, and a local oscillator signal of the N-channel is selected according to the downlink control signal and transmitted to the coherent receiver.
  • the local oscillator signal of the N channel is selected according to the downlink control signaling: according to the downlink control signaling of the control platform, the local oscillator signal of the N channel is selected by l xN BV-WSS.
  • the lower local oscillator device is a light comb.
  • the coherent receiver receives the power division signal and the local oscillator signal and performs modulation processing.
  • N is the number of signal reception paths of the downlink receiving terminal.
  • the embodiment of the present invention simplifies the generation, loading, and synthesis of the uplink carrier, and generates, demodulates, and receives the local oscillator, which reduces the complexity of the control circuit and saves costs.

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  • Optical Communication System (AREA)

Abstract

本申请实施例公开了一种基于光梳的ROADM上下路收发系统、终端及方法，包括：将一个上路激光器产生的信号通过一个上路载波装置产生所需的上路载波信号，按照上路管控信令选择M路的上路载波信号后；分别进行IQ调制及载波合路，并发送到交换节点监控模块；交换节点监控模块输出合路信号后功分处理发出到相干接收机；由一个下路激光器产生信号并通过一个下路本振装置生成本振信号，按照下路管控信令选择N路的本振信号、并发送到相干接收机；相干接收机接收功分信号及本振信号后进行解调处理；M、N为上路发送、下路接收终端的信号路数。

Description

一种基于光梳的 ROADM上下路收发的系统、 方法及终端 技术领域 本发明涉及光纤通信领域， 尤指基于光梳的可重构光分插复用器 ( ROADM )上下路收发的系统、 方法及终端。 背景技术
(一）可变带宽光网络
随着互联网的高速发展， 网络数据流量急剧增长， 另一方面， 新型的互 联网应用对带宽的需求具有不可预测性。这两方面因素驱动光网络朝着灵活、 动态、 高效的方向发展。 在这种背景下， 近年来业界提出了可变带宽光网络 的概念， 它克服了传统波分复用 （WDM )光网络粗粒度、 固定栅格的限制， 可以动态灵活的分配带宽资源，能够承载从亚波长级到超波长级的业务需求， 极大的提高了频谱资源利用率。 从物理层角度来看， 实现可变带宽光网络包 含两方面的关键技术： 可变速率收发机、 可变带宽光交换。 其中， 前者的关 键在于正交频分复用 （OFDM )技术被引入光传输领域， 而后者的关键在于 新型的可变带宽光交换器件被用于节点的全光交换。
(二） OFDM技术
OFDM是一种多载波调制技术， 它通过多个低速的正交子载波来传输高 速数据流信号。 与一般的频分复用技术不同， OFDM则由于子载波之间的正 交性， 各个子载波之间可以有频谱交叠， 无需保护带宽， 因此极大提高了频 谱利用率。 OFDM技术极大的推动了光传输技术的发展， 目前， 单信道的传 输速率已经能够达到 1 Tb/s以上。除了具有高频谱效率的优点以夕卜，光 OFDM 技术还具有抗色散 ( chromatic dispersion , 简称 CD ) 和抗偏振模色散 ( olarization mode dispersion, 简称 PMD ) 能力强的特点。 光 OFDM技术釆 用多载波复用机制并支持自适应的调制格式选择， 因此能够实现多数据速率 承载， 支持从亚波长到超波长的带宽分配。 利用光 OFDM技术， 可以实现可 变速率收发机， 主要方式包括调整电子载波数量、 调整光子波带数量、 改变 调制格式等。 (三） ROADM
可重构光分插复用器（Reconfigurable Optical Add/Drop Multiplexers, 简 称 ROADM )是关键的网络元素（或称节点） ， 通过远程的配置可以动态管 理出入端交换波长和上下路业务波长， 已广泛应用于光通信系统中。 ROADM 在一个节点上完成光通道的上下路 (Add/Drop),以及光通道之间的波长级别的 交叉调度。 它通过软件远程控制网元中的 ROADM子系统实现上下路波长的 配置和调整，允许网络在没有人工配置或昂贵而耗能的 OEO转换器的情况下 有弹性的多波长或全波长插入和分下能力。 图 1为传统的 ROADM的典型结 构示意图， 如图 1所示， ROADM最核心的功能模块包括： 交换节点监控模 块和上下路终端（上下路收发终端中的 PS和 WSS的连接构成可以进行调整。 不影响 ROADM实质的使用）。交换节点监控模块的典型结构是 splitter+WSS 结构， 实现出入端口间的波长交换功能； 上下路终端由波长交叉连接部分和 客户端收发机组成， 实现节点上路业务的选择发送及加入网络节点和下路业 务从网络节点的分下接收。
目前 ROADM的上下路实现主要有两种思路： 广播 /选择和解复用 /交叉 / 复用， 主要有三种实现技术。 上路种是基于波长阻塞器的 ROADM。 模块具 有较宽的通带、 支持较高的通路数和较窄的通路间隔， 但是元件数量多、 阻 塞器成本高、 功能有限。 下路种是基于集成平面波导电路的 ROADM, 集成 度高、 结构紧凑、 可靠性好、 速度快。 缺点是设计难度高、 价格昂贵而且存 在工作范围小、 PMD大、 波长相关损耗（WDL )不能控制、 带宽较窄。 图 1 是基于分离器（ Splitter )和波长选择开关（ WSS )的 ROADM,是第三种 ROADM 的实现方式。 优点是易于集成、 插入损耗小、 响应速度快、 信道串扰小、 与 波长和偏振无关。 作为经典的 ROADM实现方式， 其存在需要大量半导体激 光器、 IQ调制器、 功分器（PS )和 WSS ( PS和 WSS的连接构成可以进行调 整）， 成本很高， 在实现上下路时需要对上下路部分的所有 WSS统一控制和 调度， 大量的 WSS不仅造成了管控复杂的问题， 还降低了系统的可靠性， 影 响了其在光网络中的大规模应用。 发明内容 为了解决上述技术问题， 本发明实施例公开了一种基于光梳的 ROADM 上下路收发系统及方法及终端。 能够极大的简化 ROADM上下路收发系统， 实现系统成本的降低及简化管控方式。 为了达到本申请的目的， 本发明实施例提供一种基于光梳的可重构光分 插复用器 ROADM上下路收发的系统， 包括： 管控平台、 上路发送终端、 交 换节点监控模块及下路接收终端； 其中，
所述管控平台， 设置为发送上路管控信令到所述上路载波模块和所述下 路管控信令到下路本振模块；
所述上路发送终端包括： 上路载波模块、 上路选择模块、 IQ调制模块以 及合路模块； 所述下路接收终端， 包含： 功分器、 下路本振模块、 下路选择模块及相 干接收机； 其中，
所述上路载波模块， 包含一个上路激光器和一个上路载波装置， 所述上 路载波模块设置为： 根据接收的上路管控信令设置所述上路载波装置， 以使 所述上路激光器通过所述上路载波装置产生所需的上路载波信号；
所述上路选择模块， 设置为根据上路管控信令选择 M路上路载波信号， 并分别输出到 M个 IQ调制模块；
所述 IQ调制模块，设置为将接收到的上路载波信号进行信号调制并发往 所述合路模块；
所述合路模块， 设置为将 IQ调制后的所述 M路上路载波信号进行载波 合路， 并发送至所述交换节点监控模块；
所述交换节点监控模块， 设置为将接收的合路信号发送到所述功分器； 所述功分器， 设置为接收所述交换节点监控模块的合路信号， 功分后生 成功分信号发往 N路相干接收机；
所述下路本振模块， 包含一个下路激光器和一个下路本振装置， 所述下 路本振模块设置为根据接收的下路管控信令设置所述下路本振装置， 以使所 述下路激光器通过所述下路本振装置产生所需的本振信号；
所述下路选择模块， 设置为按照下路管控信令选择 N路本振信号、 并发 送到相干接收机；
所述相干接收机，设置为接收功分器输出的功分信号及各路的本振信号， 以进行解调处理；
所述 M为所述上路发送终端的信号发送路数，所述 N为所述下路接收终 端的信号接收路数， M和 N均为大于等于 1的整数。
较佳地， 所述上路载波装置和下路本振装置为光梳。
较佳地， 所述上路选择模块为： Ι χΜ可变带宽波长选择开关 BV-WSS; 所述合路模块为： Μχ 1 BV-WSS;
所述下路选择模块为： l xN BV-WSS。
较佳地， 所述合路模块还设置为， 当 IQ调制后的所述 M路上路载波功 率大于预先设置的最大输出功率 Pmax时，将所述 IQ调制后的 M路上路载波 信号衰减至功率等于 Pmax。
本发明实施例还提供一种基于光梳的可重构光分插复用器 ROADM上路 发送终端， 包括： 上路载波模块、 上路选择模块、 IQ调制模块以及合路模块； 其中，
所述上路载波模块， 包含一个上路激光器和一个上路载波装置， 所述上 路载波模块设置为根据接收的上路管控信令设置所述上路载波装置， 以使所 述上路激光器通过所述上路载波装置产生所需的上路载波信号；
所述上路选择模块， 设置为根据上路管控信令选择 M路上路载波信号， 并分别输出到 M个 IQ调制模块；
所述 IQ调制模块，设置为将将接收到的上路载波信号进行信号调制并发 往所述合路模块；
所述合路模块， 设置为将 IQ调制后的所述 M路上路载波信号进行载波 合路， 并发送至交换节点监控模块；
所述 M为所述上路发送终端的信号发送路数， M为大于等于 1的整数。 较佳地， 所述上路载波装置为光梳。
较佳地， 所述上路选择模块为： Ι χΜ可变带宽波长选择开关 BV-WSS。 较佳地， 所述合路模块还设置为， 当 IQ调制后的所述 Μ路上路载波功 率大于预先设置的最大输出功率 Pmax时，将 IQ调制后 M路所述上路载波信 号衰减至功率等于 Pmax。
本发明实施例还提供一种基于光梳的可重构光分插复用器 ROADM下路 接收终端， 包括： 功分器、 下路本振模块、 下路选择模块及相干接收机； 其 中，
所述功分器， 设置为接收交换节点监控模块的合路信号， 功分后生成功 分信号发往 N路相干接收机；
所述下路本振模块， 包含一个下路激光器和一个下路本振装置， 所述下 路本振模块设置为根据接收的下路管控信令设置下路本振装置， 以使所述下 路激光器通过所述下路本振装置产生所需的本振信号；
所述下路选择模块， 设置为按照下路管控信令选择 N路本振信号、 并发 送到所述相干接收机；
所述相干接收机，设置为接收功分器输出的功分信号及各路的本振信号， 以进行解调处理；
所述 N为下路接收终端的信号接收路数， N为大于等于 1的整数。
较佳地， 所述下路本振装置为光梳。
较佳地， 所述下路选择模块为： Ι χΝ可变带宽波长选择开关 BV-WSS。 本发明实施例还提供一种基于光梳的可重构光分插复用器 ROADM上下 路收发的方法， 包括：
将一个上路激光器产生的信号通过一个上路载波装置， 产生上路发送终 端所需的上路载波信号， 按照上路管控信令选择 M路的所述上路载波信号； 将 M路的各所述上路载波信号分别进行 IQ调制，并将 IQ调制后的上路 载波信号进行载波合路后发送到交换节点监控模块；
将交换节点监控模块输出的合路信号功分处理后产生功分信号并发出到 相干接收机；
由一个下路激光器产生信号并通过一个下路本振装置生成本振信号， 按 照下路管控信令选择 N路的本振信号、 并发送到相干接收机； 相干接收机接收功分信号及本振信号后进行解调处理；
所述 M为上路发送终端的信号发送路数，所述 N为下路接收终端的信号 接收路数， M和 N均为大于等于 1的整数。
较佳地， 所述上路载波装置和下路本振装置为光梳。
较佳地， 所述按照上路管控信令选择 M路的所述上路载波信号为： 按照 上路管控信令， 通过 I xM可变带宽波长选择开关 BV-WSS选择 M路的所述 上路载波信号；
所述将 IQ调制后的上路载波信号进行载波合路为： 将 IQ调制后的上路 载波信号通过 Mxl BV-WSS进行载波合路；
所述按照下路管控信令选择 N路的本振信号为： 按照下路管控信令， 通 过 1 χΝ BV-WSS选择 N路的所述本振信号。
较佳地， 该方法还包括： 当 IQ调制后的所述 M路上路载波功率大于预 先设置的最大输出功率 Pmax时，将所述 IQ调制后 M路上路载波信号衰减至 功率等于 Pmax。
本发明实施例还提供一种基于光梳的可重构光分插复用器 ROADM上路 发送的方法， 包括：
将一个上路激光器产生的信号通过一个上路载波装置， 产生上路发送终 端所需的上路载波信号； 按照上路管控信令选择 M路的所述上路载波信号； 将 M路的各所述上路载波信号分别进行 IQ调制，并将 IQ调制后的上路 载波信号进行载波合路后发送到交换节点监控模块；
所述 M为上路发送终端的信号发送路数， M为大于 1的整数。
较佳地， 所述上路载波装置为光梳。
较佳地， 所述按照上路管控信令选择 M路的所述上路载波信号为： 按照 上路管控信令， 通过 Ι χΜ可变带宽波长选择开关 BV-WSS选择 M路的所述 上路载波信号。
较佳地， 该方法还包括： 当 IQ调制后的所述 M路上路载波功率大于预 先设置的最大输出功率 Pmax时，将所述 IQ调制后的 M路上路载波信号衰减 至功率等于 Pamx。
本发明实施例还提供一种基于光梳的可重构光分插复用器 ROADM下路 接收的方法， 包括：
将交换节点监控模块输出的合路信号功分处理后产生功分信号并发出到 相干接收机；
由一个下路激光器产生信号并通过一个下路本振装置生成本振信号， 按 照下路管控信令选择 N路的本振信号、 并发送到相干接收机；
相干接收机接收功分信号及本振信号后进行解调处理；
所述 N为下路接收终端的信号接收路数， N为大于 1的整数。
较佳地， 所述下路本振装置为光梳。
较佳地， 所述按照下路管控信令选择 N路的本振信号为： 按照下路管控 信令， 通过 Ι χΝ可变带宽波长选择开关 BV-WSS选择 N路的所述本振信号。
本发明实施例实现了简化载波生成、 加载及合成结构的上路发送终端， 和本振生成、 解调及接收的下路接收终端， 大大简化了上下路收发系统， 降 低管控电路复杂程度， 节约了大量的成本、 空间和能耗； 另外通过调整 BV-WSS及增减上路发送终端的 IQ调制模块、下路接收终端相干接收机路数， 来增减上下路容量， 实现了灵活的系统扩展。 附图概述 此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部 分， 本发明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的 不当限定。 在附图中：
图 1为相关技术的 ROADM的典型结构示意图；
图 2为本发明实施例一种基于光梳的 ROADM上下路收发的系统的结构 框图；
图 3为本发明实施例一种基于光梳的 ROADM上下路收发的方法的流程 图。 本发明的较佳实施方式 光梳， 又称光学频率梳（optical frequency comb ) , 在这里指的是一种基 于锁模脉冲激光技术或循环移频等技术的光学器件。 当输入一个窄脉冲种子 激光时能够输出一组多达上百条频率离散、 在时域上波长间隔精确相等、 相 位和噪声特性一致的波长。 这组光的频谱分布很像梳齿， 彼此间隔与激光器 的重复频率精确相等。 通过控制输入种子光可以调整输出光的频率。 一个激 光器和一个光梳组合能够产生上百个载波用于光通信中， 代替相同数量的单 独激光器， 节省资源和能耗。
WSS , 基于硅基液晶 （ LCoS ) 技术的可变带宽波长选择开关 ( bandwidth-variable wavelength-selective switch, 简称 BV-WSS )被广泛用作 交换单元来实现可变带宽的光交换， 它可以灵活的调节交换粒度， 交换窗口 从细粒度（小于 50 GHz的标准 WDM栅格 )到粗粒度灵活可调 , 而且中心频 率可调， 因此可以实现灵活可变的频谱分配。 目前， 商用化的 BV-WSS已经 能够支持 1 GHz频谱分辨率、 最小操作带宽 10 GHz以下的光交换。 典型的 可变带宽光交换节点监控模块结构如图 1所示， 不同带宽的光超级信道可以 在节点进行灵活的选择和交换。
下文将结合附图对本发明实施例作详细说明。 需要说明的是， 在不冲突 的情况下 , 本申请的实施例和实施例中的特征可以任意相互组合。 图 2为本发明实施例一种基于光梳的 ROADM上下路收发的系统的结构 框图； 如图 2所示， 包括： 管控平台、 上路发送终端、 交换节点监控模块及 下路接收终端； 其中，
管控平台， 设置为发送上路管控信令到上路载波模块和下路管控信令到 下路本振模块。 需要说明的是， 上路管控指令和下路管控指令为现有系统接收光网络交 换指令发送到管控平台产生的指令， 现有技术是发送到上下路信号的每一路 激光器中进行处理， 本发明实施例只需要发送上路载波模块和下路本振模块 进行设置即可。
上路发送终端包括： 上路载波模块、 上路选择模块、 IQ调制模块、 合路 模块； 其中，
上路载波模块， 包含一个上路激光器和一个上路载波装置， 设置为根据 接收的上路管控信令设置上路载波装置， 以使上路激光器通过上路载波装置 产生所需的上路载波信号。
需要说明的是， 本发明实施例釆用一个上路激光器和一个上路载波装置
(光梳） 实现取代现有的大量半导体激光器， 大量简化了系统终端的设计， 同时节约了大量的成本。 另外， IQ调制是业界所知的一种调制方式， 就是数 据分为两路，分别进行载波调制， 两路载波相互正交。其中 I为： in-phase (同 相)， Q: quadrature (正交) 。
上路选择模块， 设置为根据上路管控信令选择 M路上路载波信号， 并分 别输出到 M个 IQ调制模块。
较佳地， 上路选择模块为： Ι χΜ可变带宽波长选择开关 （BV-WSS ) 。
IQ调制模块,设置为将 M路上路载波信号分别进行信号调制并发往合路 模块。
合路模块，设置为将 IQ调制后的所述 M路上路载波信号进行载波合路， 并发送至交换节点监控模块。
较佳地， 合路模块为： Mxl BV-WSS。
需要说明的是， IQ调制为现有技术方案， 在这里进行说明， 是为了完整 的陈述系统的工作。合路模块釆用 M xl BV-WSS, 将现有技术中大量的功分 器进行取代， 简化了系统设计。
交换节点监控模块， 设置为将接收的合路信号发送到功分器。
下路接收终端， 包含： 功分器、 下路本振模块、 下路选择模块及相干接 收机； 其中，
功分器， 设置为接收交换节点监控模块的合路信号， 功分后生成功分信 号发往 N路相干接收机。
下路本振模块， 包含一个下路激光器和一个下路本振装置， 设置为根据 接收的下路管控信令设置下路本振装置， 以使下路激光器通过下路本振装置 产生所需的本振信号； 下路选择模块， 按照下路管控信令选择 N路本振信号、 并发送到相干接 收机。
较佳地， 下路选择模块为： l xN BV-WSS。
相干接收机， 设置为接收功分器输出的功分信号及各路的本振信号， 以 进行解调处理。
M为上路发送终端的信号发送路数， 所述 N为下路接收终端的信号接收 路数， M和 N均为大于等于 1的整数。
本发明实施例的系统中， 上路载波装置和下路本振装置为光梳。
需要说明的是， 本发明实施例的上路选择模块釆用 BV-WSS代替现有的 网络中的 WSS, 通过对选择的 M路进行控制， 合路模块为与上路选择模块 Ι Μ BV-WSS对应的 Μχΐ的 BV-WSS 实现对 IQ调制后的信号进行合路。 由于 WSS价格昂贵， 通过本发明实施例釆用 BV-WSS对上下路收发终端的 改进设计， 大大降低了系统的开发成本。 相同的， 下路选择模块釆用的 BV-WSS是与 N路相匹配的 1 χΝ BV-WSS , 通过选择与系统相对应的 Ν值， 进行系统的设计实现。 上路选择模块 Ι χΜ BV-WSS 和 N路可以为 Ι χΝ BV-WSS, M和 N为 BV-WSS允许的范围的整数即可。
另外， 本发明实施例的系统将多个 WSS替换为一个 BV-WSS是由于现 有 ROADM上下路收发系统使用了大量独立激光器， 这些激光器产生的载波 一致性较光梳产生的载波一致性要差， 因此需要更为复杂的管控方式。 本发 明实施例基于光梳的 ROADM上下路收发系统使用一个 WSS,在简化结构的 同时， 也简化了系统对产生载波的管控。
通过对以上上路载波模块、 上路选择模块、 合路模块、 下路本振模块及 下路选择模块， 实现了对上下路收发终端的简化设计， 也降低的成本， 通过 简化设计， 在增减上下路容量时， 无需对半导体激光器和 WSS进行硬件调整 和设计， 只需要相应的在上路发射系统添加相应信号处理的 IQ调制器， 在下 路终端中添加相干接收机即可。 也大大降低了系统的管控难度， 实现了系统 方法的优良改进。 具体实现过程为， 管控平台从交换节点监控模块获得监控 数据， 根据监控数据产生相应的上路管控信令和下路管控信令， 根据上路管 控信令对上路发送终端进行上路载波模块、 上路选择模块及合路模块的参数 调整， IQ调制器路数的增减调整； 根据下路管控信令对上路发送终端进行下 路本振模块、 下路选择模块的参数调整， 相干接收机路数的增减调整； 下路 接收终端的原理和上路发送终端相似， 部分原理不再重述。
在上路发送终端添加信号路数时， 通过本发明实施例只需要调整 Ι χΜ
BV-WSS的参数设置， 及增减相应的 IQ调制器； 在下路接收装置， 只需要调 整 l xN BV-WSS的参数设置及相干接收的数量（或者选择可以调整信号路数 的相干接收机， 直接调整信号路数） 即可。
本发明实施例的合路模块还设置为， 当 IQ调制后的 M路上路载波功率 大于预先设置的最大输出功率（Pmax ) 时， 对 IQ调制后的 M路上路载波信 号进行衰减， 使其功率衰减至 Pmax。
一种基于光梳的可重构光分插复用器 ROADM上路发送终端， 包括： 上 路载波模块、 IQ调制模块、 选择模块以及合路模块； 其中，
上路载波模块， 包含一个上路激光器和一个上路载波装置， 设置为根据 接收的上路管控信令设置上路载波装置， 以使上路激光器通过上路载波装置 产生所需的上路载波信号。
较佳地， 上路载波装置为光梳。
上路选择模块， 设置为根据上路管控信令选择 M路上路载波信号， 并分 别输出到 M个 IQ调制模块。
较佳地， 上路选择模块为： l xM BV-WSS。
IQ调制模块,设置为将 M路上路载波信号分别进行信号调制并发往合路 模块。
合路模块，设置为将 IQ调制后的所述 M路上路载波信号进行载波合路， 并发送至交换节点监控模块。
M为上路发送终端的信号发送路数。
合路模块还设置为， 当 IQ调制后的所述 M路上路载波功率大于预先设 置的最大输出功率（Pmax ) 时， 对 IQ调制后 M路所述上路载波信号进行衰 减， 使其功率衰减至 Pmax。 一种基于光梳的可重构光分插复用器 ROADM下路接收终端， 包括： 功 分器、 下路本振模块、 下路选择模块及相干接收机； 其中，
功分器， 设置为接收交换节点监控模块的合路信号， 功分后生成功分信 号发往 N路相干接收机。
下路本振模块， 包含一个下路激光器和一个下路本振装置， 设置为根据 接收的下路管控信令设置下路本振装置， 以使下路激光器通过下路本振装置 产生所需的本振信号。
较佳地， 下路本振装置为光梳。
下路选择模块， 按照下路管控信令选择 N路本振信号、 并发送到相干接 收机。
较佳地， 下路选择模块为： l xN BV-WSS。
相干接收机， 设置为接收功分器输出的功分信号及各路的本振信号， 以 进行解调处理。
N为下路接收终端的信号接收路数。
下路管控指令为： 由管控平台直接设置或由管控平台根据交换节点监控 模块的监控信息获得的指令。
图 3为本发明实施例一种基于光梳的 ROADM上下路收发的方法的流程 图， 如图 3所示， 包括：
步骤 300、 将一个上路激光器产生的信号通过一个上路载波装置， 产生 上路发送终端所需的上路载波信号，按照上路管控信令选择 M路的上路载波 信号。
本步骤中， 按照上路管控信令选择 M路的所述上路载波信号为： 按照上 路管控信令， 通过 l xM BV-WSS选择 M路的所述上路载波信号。
步骤 301、 将 M路的各上路载波信号分别进行 IQ调制， 并将 IQ调制后 的上路载波信号进行载波合路后发送到交换节点监控模块。
本步骤中， 将 IQ调制后的上路载波信号进行载波合路为： 将 IQ调制后 的上路载波信号通过 Mxl BV-WSS进行载波合路； 步骤 302、 将交换节点监控模块输出的合路信号功分处理后产生功分信 号并发出到相干接收机。
步骤 303、 由一个下路激光器产生信号并通过一个下路本振装置生成本 振信号， 按照下路管控信令选择 N路的本振信号、 并发送到相干接收机。
按照下路管控信令选择 N路的本振信号为： 按照管控平台的下路管控信 令， 通过 l xN BV-WSS选择 N路的本振信号。
步骤 304、 相干接收机接收功分信号及本振信号后进行解调处理。
步骤 300和步骤 303中的上路载波装置和下路本振装置为光梳。
当 IQ调制后的所述 M路上路载波功率大于预先设置的最大输出功率 (Pmax)时， 对所述 IQ调制后 M路上路载波信号进行衰减， 使其功率衰减至 Pmax„
一种基于光梳的可重构光分插复用器 ROADM上路发送的方法， 包括： 将一个上路激光器产生的信号通过一个上路载波装置， 产生上路发送终 端所需的上路载波信号； 按照上路管控信令选择 M路的上路载波信号。
其中， 上路载波装置为光梳。
较佳地， 按照上路管控信令选择 M路的上路载波信号为： 按照上路管控 信令， 通过 l xM BV-WSS选择 M路的上路载波信号；
将 M路的各上路载波信号分别进行 IQ调制，并将 IQ调制后的上路载波 信号进行载波合路后发送到交换节点监控模块。
M为上路发送终端的信号发送路数。
当 IQ调制后的所述 M路上路载波功率大于预先设置的 Pmax时， 对 IQ 调制后的 M路上路载波信号进行衰减， 使其功率衰减至 Pmax。
一种基于光梳的可重构光分插复用器 ROADM下路接收的方法， 包括： 将交换节点监控模块输出的合路信号功分处理后产生功分信号并发出到 相干接收机。
由一个下路激光器产生信号并通过一个下路本振装置生成本振信号， 按 照下路管控信令选择 N路的本振信号、 并发送到相干接收机。 较佳地， 按照下路管控信令选择 N路的本振信号为： 按照管控平台的下 路管控信令， 通过 l xN BV-WSS选择 N路的本振信号。
下路本振装置为光梳。
相干接收机接收功分信号及本振信号后进行调制处理。
N为下路接收终端的信号接收路数。
虽然本申请所揭露的实施方式如上， 但所述的内容仅为便于理解本申请 而釆用的实施方式， 并非用以限定本申请。 任何本申请所属领域内的技术人 员， 在不脱离本申请所揭露的精神和范围的前提下， 可以在实施的形式及细 节上进行任何的修改与变化， 但本申请的专利保护范围， 仍须以所附的权利 要求书所界定的范围为准。
工业实用性 本发明实施例实现了简化上路载波生成、 加载及合成和下路本振生成、 解调及接收结构， 降低了管控电路的复杂程度， 节约了成本。

Claims

权 利 要 求 书
1、 一种基于光梳的可重构光分插复用器 ROADM上下路收发的系统， 包括： 管控平台、 上路发送终端、 交换节点监控模块及下路接收终端； 其中， 所述管控平台， 设置为发送上路管控信令到所述上路载波模块和所述下 路管控信令到下路本振模块； 所述上路发送终端包括： 上路载波模块、 上路选择模块、 IQ调制模块以 及合路模块； 所述下路接收终端， 包含： 功分器、 下路本振模块、 下路选择模块及相 干接收机； 其中，
所述上路载波模块， 包含一个上路激光器和一个上路载波装置， 所述上 路载波模块设置为： 根据接收的上路管控信令设置所述上路载波装置， 以使 所述上路激光器通过所述上路载波装置产生所需的上路载波信号；
所述上路选择模块， 设置为根据上路管控信令选择 M路上路载波信号， 并分别输出到 M个 IQ调制模块；
所述 IQ调制模块，设置为将接收到的上路载波信号进行信号调制并发往 所述合路模块；
所述合路模块， 设置为将 IQ调制后的所述 M路上路载波信号进行载波 合路， 并发送至所述交换节点监控模块；
所述交换节点监控模块， 设置为将接收的合路信号发送到所述功分器； 所述功分器， 设置为接收所述交换节点监控模块的合路信号， 功分后生 成功分信号发往 N路相干接收机；
所述下路本振模块， 包含一个下路激光器和一个下路本振装置， 所述下 路本振模块设置为根据接收的下路管控信令设置所述下路本振装置， 以使所 述下路激光器通过所述下路本振装置产生所需的本振信号；
所述下路选择模块， 设置为按照下路管控信令选择 N路本振信号、 并发 送到相干接收机； 所述相干接收机，设置为接收功分器输出的功分信号及各路的本振信号， 以进行解调处理；
所述 M为所述上路发送终端的信号发送路数，所述 N为所述下路接收终 端的信号接收路数， M和 N均为大于等于 1的整数。
2、 根据权利要求 1所述的系统， 其中， 所述上路载波装置和下路本振装 置为光梳。
3、 根据权利要求 1 所述的系统， 其中， 所述上路选择模块为： Ι χΜ可 变带宽波长选择开关 BV-WSS;
所述合路模块为： Μχ 1 BV-WSS;
所述下路选择模块为： l xN BV-WSS。
4、根据权利要求 1~3任一项所述的系统，其中，所述合路模块还设置为， 当 IQ调制后的所述 M路上路载波功率大于预先设置的最大输出功率 Pmax 时， 将所述 IQ调制后的 M路上路载波信号衰减至功率等于 Pmax。
5、 一种基于光梳的可重构光分插复用器 ROADM上路发送终端， 包括： 上路载波模块、 上路选择模块、 IQ调制模块以及合路模块； 其中，
所述上路载波模块， 包含一个上路激光器和一个上路载波装置， 所述上 路载波模块设置为根据接收的上路管控信令设置所述上路载波装置， 以使所 述上路激光器通过所述上路载波装置产生所需的上路载波信号；
所述上路选择模块， 设置为根据上路管控信令选择 M路上路载波信号， 并分别输出到 M个 IQ调制模块；
所述 IQ调制模块，设置为将将接收到的上路载波信号进行信号调制并发 往所述合路模块；
所述合路模块， 设置为将 IQ调制后的所述 M路上路载波信号进行载波 合路， 并发送至交换节点监控模块；
所述 M为所述上路发送终端的信号发送路数， M为大于等于 1的整数。
6、 根据权利要求 5所述的 ROADM上路发送终端， 其中， 所述上路载 波装置为光 υ。
7、 根据权利要求 5所述的 ROADM上路发送终端， 其中， 所述上路选 择模块为： Ι χΜ可变带宽波长选择开关 BV-WSS。
8、 根据权利要求 5~7任一项所述的 ROADM上路发送终端， 其中， 所 述合路模块还设置为， 当 IQ调制后的所述 M路上路载波功率大于预先设置 的最大输出功率 Pmax时，将 IQ调制后 M路所述上路载波信号衰减至功率等 于 Pmax„
9、 一种基于光梳的可重构光分插复用器 ROADM下路接收终端， 包括： 功分器、 下路本振模块、 下路选择模块及相干接收机； 其中，
所述功分器， 设置为接收交换节点监控模块的合路信号， 功分后生成功 分信号发往 N路相干接收机； 所述下路本振模块， 包含一个下路激光器和一个下路本振装置， 所述下 路本振模块设置为根据接收的下路管控信令设置下路本振装置， 以使所述下 路激光器通过所述下路本振装置产生所需的本振信号；
所述下路选择模块， 设置为按照下路管控信令选择 N路本振信号、 并发 送到所述相干接收机； 所述相干接收机，设置为接收功分器输出的功分信号及各路的本振信号， 以进行解调处理；
所述 N为下路接收终端的信号接收路数， N为大于等于 1的整数。
10、 根据权利要求 9所述的 ROADM下路接收终端， 其中， 所述下路本 振装置为光梳。
11、 根据权利要求 9所述的 ROADM下路接收终端， 其中， 所述下路选 择模块为： Ι χΝ可变带宽波长选择开关 BV-WSS。
12、 一种基于光梳的可重构光分插复用器 ROADM上下路收发的方法， 包括：
将一个上路激光器产生的信号通过一个上路载波装置， 产生上路发送终 端所需的上路载波信号， 按照上路管控信令选择 M路的所述上路载波信号； 将 M路的各所述上路载波信号分别进行 IQ调制，并将 IQ调制后的上路 载波信号进行载波合路后发送到交换节点监控模块； 将交换节点监控模块输出的合路信号功分处理后产生功分信号并发出到 相干接收机；
由一个下路激光器产生信号并通过一个下路本振装置生成本振信号， 按 照下路管控信令选择 N路的本振信号、 并发送到相干接收机；
相干接收机接收功分信号及本振信号后进行解调处理；
所述 M为上路发送终端的信号发送路数，所述 N为下路接收终端的信号 接收路数， M和 N均为大于等于 1的整数。
13、 根据权利要求 12所述的方法， 其中， 所述上路载波装置和下路本振 装置为光梳。
14、 根据权利要求 12所述的方法， 其中，
所述按照上路管控信令选择 M路的所述上路载波信号为： 按照上路管控 信令， 通过 I xM可变带宽波长选择开关 BV-WSS选择 M路的所述上路载波 信号；
所述将 IQ调制后的上路载波信号进行载波合路为： 将 IQ调制后的上路 载波信号通过 Mxl BV-WSS进行载波合路；
所述按照下路管控信令选择 N路的本振信号为： 按照下路管控信令， 通 过 1 χΝ BV-WSS选择 N路的所述本振信号。
15、根据权利要求 12~14所述的方法， 该方法还包括： 当 IQ调制后的所 述 M路上路载波功率大于预先设置的最大输出功率 Pmax时，将所述 IQ调制 后 M路上路载波信号衰减至功率等于 Pmax。
16、 一种基于光梳的可重构光分插复用器 ROADM上路发送的方法， 包 括：
将一个上路激光器产生的信号通过一个上路载波装置， 产生上路发送终 端所需的上路载波信号； 按照上路管控信令选择 M路的所述上路载波信号； 将 M路的各所述上路载波信号分别进行 IQ调制，并将 IQ调制后的上路 载波信号进行载波合路后发送到交换节点监控模块；
所述 M为上路发送终端的信号发送路数， M为大于 1的整数。
17、 根据权利要求 16所述的方法， 其中， 所述上路载波装置为光梳。
18、根据权利要求 16所述的方法， 其中， 所述按照上路管控信令选择 M 路的所述上路载波信号为： 按照上路管控信令， 通过 Ι χΜ可变带宽波长选择 开关 BV-WSS选择 M路的所述上路载波信号。
19、根据权利要求 16~18所述的方法， 该方法还包括： 当 IQ调制后的所 述 M路上路载波功率大于预先设置的最大输出功率 Pmax时，将所述 IQ调制 后的 M路上路载波信号衰减至功率等于 Pamx。
20、 一种基于光梳的可重构光分插复用器 ROADM下路接收的方法， 包 括：
将交换节点监控模块输出的合路信号功分处理后产生功分信号并发出到 相干接收机；
由一个下路激光器产生信号并通过一个下路本振装置生成本振信号， 按 照下路管控信令选择 N路的本振信号、 并发送到相干接收机；
相干接收机接收功分信号及本振信号后进行解调处理；
所述 N为下路接收终端的信号接收路数， N为大于 1的整数。
21、 根据权利要求 20所述的方法， 其中， 所述下路本振装置为光梳。
22、 根据权利要求 20所述的方法， 其中， 所述按照下路管控信令选择 N 路的本振信号为： 按照下路管控信令， 通过 Ι χΝ 可变带宽波长选择开关 BV-WSS选择 N路的所述本振信号。
PCT/CN2014/085130 2014-03-10 2014-08-25 一种基于光梳的roadm上下路收发的系统、方法及终端 WO2015135296A1 (zh)

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