WO2016197345A1 - 一种信号传输方法、控制器和信号传输系统 - Google Patents

一种信号传输方法、控制器和信号传输系统 Download PDF

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Publication number
WO2016197345A1
WO2016197345A1 PCT/CN2015/081181 CN2015081181W WO2016197345A1 WO 2016197345 A1 WO2016197345 A1 WO 2016197345A1 CN 2015081181 W CN2015081181 W CN 2015081181W WO 2016197345 A1 WO2016197345 A1 WO 2016197345A1
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Prior art keywords
signal
receiver
optical
transmitter
controller
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PCT/CN2015/081181
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English (en)
French (fr)
Inventor
魏文雄
杨迎春
潘顺成
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201580001135.2A priority Critical patent/CN106664236B/zh
Priority to EP15894615.2A priority patent/EP3297220B1/en
Priority to PCT/CN2015/081181 priority patent/WO2016197345A1/zh
Publication of WO2016197345A1 publication Critical patent/WO2016197345A1/zh
Priority to US15/835,963 priority patent/US10135556B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/12—Arrangements for remote connection or disconnection of substations or of equipment thereof
    • 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
    • H04B10/40—Transceivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1694—Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
    • H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
    • H04L25/062—Setting decision thresholds using feedforward techniques only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0064—Admission Control
    • H04J2203/0067—Resource management and allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0064—Arbitration, scheduling or medium access control aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects

Definitions

  • Embodiments of the present invention relate to the field of communications, and, more particularly, to a signal transmission method, a controller, and a signal transmission system.
  • multiple transmitters Tx and receivers Rx are connected through an Optical Switching Network (OSN), and the optical path between the transmitter and the receiver is switched with the optical switching network. The change occurs, and the transmission mode between the transmitter and the receiver is the burst transmission mode.
  • Transmitters and receivers operating in burst transmission mode are called burst transmitters and burst receivers, and signals transmitted in burst transmission mode may be referred to as bursts.
  • the current state of the optical switching network is: the optical path between the transmitter Tx1 and the receiver Rx1 is established, and the Tx1 sends a burst packet to the Rx1;
  • the state switching of the optical switching network at the next moment is: the transmitter Tx1 and the receiver Rx1
  • the optical path between the two is cut off, and the optical path between the transmitter Tx4 and the receiver Rx1 is established, and the transmitter Tx4 transmits a burst packet to the receiver Rx1, but before the receiver Rx1 is in the burst packet transmitted by the receiving transmitter Tx1
  • the state, so the parameter setting of the receiver Rx1 is still for the burst packet sent by the receiving Tx1.
  • the receiver Rx1 can only effectively receive a new signal (ie, a burst packet transmitted by Tx4) only when the reset is in an initial state.
  • a detection module is usually deployed on the receiver side, and when the detection module detects a signal from a new transmitter, the receiver is triggered to be reset to an initial state. It can be seen that in the current technology, the receiver is not reset to the initial state until the signal sent by the transmitter reaches the receiver, which results in a longer response time for the receiver to effectively receive the new signal, and the utilization ratio of the optical switching network. Lower.
  • Embodiments of the present invention provide a signal transmission method, a controller, and a signal transmission system, which are capable of transmitting a reset signal to a receiver in time, thereby effectively reducing a response time of a receiver receiving a new signal.
  • a signal transmission method is provided, the method being applied to an optical transmission system, the optical transmission system comprising an optical switching network and a controller for controlling the optical switching network, wherein in the optical switching network There is a first optical path connecting the first transmitter and the first receiver, the party The law includes:
  • the controller receives a request signal sent by the first transmitter, and the request signal is used to request to send an optical signal to the second receiver;
  • the controller establishes a second optical path connecting the first transmitter and the second receiver in the optical switching network by controlling an optical switch in the optical switching network according to the request signal;
  • the controller sends a reset signal for indicating that the second receiver is reset to an initial state according to the request signal to the second receiver;
  • the controller sends an acknowledgment signal to the first transmitter after transmitting the reset signal or at the same time, the acknowledgment signal is used to instruct the first transmitter to send an optical signal to the second receiver through the second optical path.
  • the controller establishes a second optical path by changing a state of the optical switch in the optical switching network, including:
  • the controller establishes the second optical path in the case of determining that the second optical path is idle.
  • the controller sends, according to the request signal, the second receiver, to indicate the first
  • the reset signal of the second receiver reset to the initial state includes:
  • the controller transmits the reset signal to the reset port of the limiting amplifier LA of the second receiver according to the request signal.
  • the controller sends, according to the request signal, the second receiver, to indicate that the second receiver is heavy
  • the reset signal set to the initial state including:
  • the controller transmits the reset signal to the reset port of the transimpedance amplifier TIA of the second receiver and/or the reset port of the clock data recovery CDR according to the request signal.
  • the controller sends, according to the request signal, the second receiver,
  • the reset signal of the second receiver reset to the initial state includes:
  • the controller transmits the reset signal to the reset signal generator of the second receiver according to the request signal.
  • the method further includes:
  • the controller disconnects the optical switch in the optical switching network according to the request signal The first light path.
  • the second receiver is a burst receiver using DC coupling.
  • a controller is provided, the controller being applied to an optical transmission system, the optical transmission system comprising an optical switching network, the controller for controlling the optical switching network, wherein the optical switching network exists Connecting a first optical path of the first transmitter and the first receiver, the controller comprising:
  • a receiving module configured to receive a request signal sent by the first transmitter, where the request signal is used to request to send an optical signal to the second receiver;
  • An optical path establishing module configured to establish, according to the request signal received by the receiving module, a second optical path connecting the first transmitter and the second receiver in the optical switching network by controlling an optical switch in the optical switching network ;
  • the sending module is configured to send, according to the request signal received by the receiving module, a reset signal for indicating that the second receiver is reset to an initial state, to the second receiver;
  • the sending module is further configured to send an acknowledgment signal to the first transmitter after transmitting the reset signal, where the acknowledgment signal is used to indicate that the first transmitter sends the second transmitter to the second receiver by using the second optical path Optical signal.
  • the optical path establishing module is configured to establish the second optical path if it is determined that the second optical path is idle.
  • the sending module is specifically configured to: according to the request signal, to the second receiver
  • the reset port of the limiting amplifier LA transmits the reset signal.
  • the sending module is specifically configured to: according to the request signal, a transimpedance amplifier TIA to the second receiver
  • the reset port and/or the clock data recovery CDR reset port sends the reset signal.
  • the sending module is specifically configured to: according to the request signal, to the second receiver
  • the reset signal generator sends the reset signal.
  • the controller further includes:
  • the optical path disconnecting module is configured to disconnect the first optical path by controlling an optical switch in the optical switching network according to the request signal.
  • the second receiver is a burst receiver using DC coupling.
  • a signal transmission system comprising:
  • An optical switching network in which a first optical path connecting the first transmitter and the first receiver exists
  • a controller configured to control the optical switching network
  • the controller is specifically configured to receive a request signal sent by the first transmitter, where the request signal is used to request to send an optical signal to the second receiver; according to the request signal Establishing a second optical path connecting the first transmitter and the second receiver in the optical switching network by controlling an optical switch in the optical switching network; transmitting, according to the request signal, the second receiver to the second receiver a reset signal indicating that the second receiver is reset to an initial state; after transmitting the reset signal or simultaneously, transmitting an acknowledgement signal to the first transmitter, the acknowledge signal being used to indicate that the first transmitter passes the first The two optical paths transmit optical signals to the second receiver.
  • the controller is specifically configured to establish the second optical path if the second optical path is determined to be idle.
  • the controller is specifically configured to: according to the request signal, to the second receiver
  • the reset port of the limiting amplifier LA transmits the reset signal.
  • the controller is specifically configured to: according to the request signal, a transimpedance amplifier TIA to the second receiver
  • the reset port and/or the clock data recovery CDR reset port sends the reset signal.
  • the controller is specifically configured to: according to the request signal, to the second receiver
  • the reset signal generator sends the reset signal.
  • the controller is further configured to: according to the request signal, disconnect the first switch by controlling an optical switch in the optical switching network Light path.
  • the at least one transmitter is a burst transmitter
  • the at least two receivers are burst receivers using DC coupling.
  • the controller of the optical switching network sends a reset signal sent by the transmitter to the receiver to indicate that it is reset to the initial state according to the request signal sent by the transmitter to the optical signal sent by the receiver. Transmitting, and sending an acknowledgment signal for indicating to the receiver to transmit an optical signal to the transmitter after the reset signal or at the same time, enabling timely transmission of the reset signal to the second receiver, so that the receiver receives the The optical signal sent by the transmitter has been reset to the initial state before, which can effectively shorten the response time of the receiver to receive a new optical signal, thereby improving the utilization of the optical switching network.
  • FIG. 1 is a schematic diagram of a scenario of an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart of a signal transmission method according to an embodiment of the present invention.
  • FIG. 3 shows another schematic flowchart of a signal transmission method according to an embodiment of the present invention.
  • FIG. 4 shows a schematic block diagram of a receiver according to an embodiment of the present invention.
  • FIG. 5 shows still another schematic flowchart of a signal transmission method according to an embodiment of the present invention.
  • FIG. 6 shows still another schematic flowchart of a signal transmission method according to an embodiment of the present invention.
  • FIG. 7 shows a schematic block diagram of a controller provided in accordance with an embodiment of the present invention.
  • FIG. 8 shows another schematic block diagram of a controller provided in accordance with an embodiment of the present invention.
  • FIG. 9 shows a schematic block diagram of a signal transmission system provided in accordance with an embodiment of the present invention.
  • FIG. 10 shows another schematic block diagram of a signal transmission system provided in accordance with an embodiment of the present invention.
  • FIG. 11 shows still another schematic block diagram of a signal transmission system according to an embodiment of the present invention.
  • WDM Wavelength Division Multiplexing
  • MDM Mode Division Multiplexing
  • FDM Frequency Division Multiplexing
  • TDM Time Division Multiplexing
  • FMF small mode fiber
  • an optical path 1 connecting the transmitter Tx1 and the receiver Rx1 is established, and an optical path connecting the transmitter Tx4 and the receiver Rx4 is established.
  • the transmitter Tx1 transmits a burst packet to the receiver Rx1 through the optical path 1
  • the transmitter Tx4 transmits the burst packet to the receiver Rx4 through the optical path 2; at the next moment, the transmitter Tx4 instead transmits the burst packet to the receiver Rx1.
  • an optical path 3 between the transmitter Tx4 and the receiver Rx1 is established in the optical switching network, and the transmitter Tx4 transmits a burst packet to the receiver Rx1 through the optical path 3, but before this, the receiver Rx1 is at the receiving transmitter Tx1
  • the status of the transmitted burst packet, so the parameter setting of the receiver Rx1 is still for the burst packet sent by the receiving Tx1.
  • the receiver Rx1 can only effectively receive a new signal (ie, a burst packet transmitted by Tx4) only after being reset to the initial state. Specifically, when the receiver Rx1 is reset to the initial state, it is received according to the receiver.
  • the signal sent by Tx4 is modified by the parameter setting to modify the state of Rx1, and finally modified to the state of receiving the signal transmitted by Tx4, and then the signal transmitted by Tx4 can be effectively received.
  • the detection module is generally added in the receiver Rx1, and when the detection module detects a new signal (a signal different from that received before Rx1), the reset of the receiver Rx1 is triggered to an initial state. The action, that is to say, in the current technology, the Rx1 reset action is triggered until the optical signal sent by Tx4 reaches the receiver Rx1.
  • the receiver Rx1 starts from the end of receiving the burst packet of Tx1 until Effectively receiving the burst packet sent by Tx4 takes a long time (hereinafter referred to as the response time of receiving a new signal), during which time Tx4 to Rx1 cannot send valid data, required
  • the response time of receiving a new signal the time Tx4 to Rx1 cannot send valid data
  • the present invention is directed to the above problems, and proposes a signal transmission method, controller and system based on an optical switching network.
  • FIG. 2 is a schematic flowchart of a signal transmission method 100 according to an embodiment of the present invention.
  • the method is applied to an optical transmission system, where the optical transmission system includes an optical switching network and a controller for controlling the optical switching network. There is a first optical path connecting the first transmitter and the first receiver in the optical switching network.
  • the method 100 is performed by, for example, a controller of the optical switching network.
  • the method 100 includes:
  • the controller receives a request signal sent by the first transmitter, where the request signal is used to request to send an optical signal to the second receiver.
  • the first transmitter is Tx4 as shown in FIG. 1
  • the first receiver is Rx4 shown in FIG. 1
  • the second receiver is Rx1 shown in FIG. 1, the first optical path.
  • the optical path (such as the optical path 3 shown in FIG. 1) connecting the first transmitter (Tx4) and the second receiver (Rx1) in the optical switching network is not yet turned on, for example, the optical switch in the optical path 3. Not all closed, so when the first transmitter (Tx4) needs to send an optical signal to the second receiver (Rx1), a request signal is sent to the controller for requesting establishment of the first transmitter (Tx4) and the second reception An optical path of the machine (Rx1) to transmit an optical signal to the second receiver.
  • the controller determines, according to the request signal, a second optical path connecting the first transmitter and the second receiver in the optical switching network by controlling an optical switch in the optical switching network.
  • an optical switching network typically includes a plurality of 2*2 optical switches having two inlets and two outlets.
  • the two inlets in the optical switch can be modified.
  • the two entries of a 2*2 optical switch are input1 and input2, respectively, and the two outlets are output1 and output2, respectively. It is assumed that the original configuration relationship between the two entries and the two outlets is that the optical signal entering the optical switch from input1 is from Output1 is output, and the optical signal entering the optical switch from input2 is output from output2.
  • optical switching network by controlling the state of one, more or all of the optical switches at a certain time, the optical path of the optical switching network entering from the entrance to the optical path of the outlet can be changed.
  • the entrance of the optical switching network is connected to the transmitter, and the outlet is connected to the receiver, which also changes the optical path from the transmitter to the receiver by changing the optical path from the entrance to the exit of the optical switching network.
  • the optical switch of the network can establish a second optical path (such as the optical path 3 shown in FIG. 1) connecting the first transmitter (Tx4) and the second receiver (Rx4) in the optical switching network.
  • the controller sends, according to the request signal, a reset signal for indicating that the second receiver is reset to an initial state, to the second receiver.
  • the controller transmits the reset signal to the second receiver to indicate that the second receiver is reset to an initial state. It should be understood that, in the initial state, the receiver can continuously adjust the parameter settings according to the received new optical signal, and finally determine the parameter configuration for the new optical signal, thereby effectively receiving the new optical signal.
  • the controller sends an acknowledgment signal to the first transmitter after transmitting the reset signal, or the acknowledgment signal is used to indicate that the first transmitter sends an optical signal to the second receiver by using the second optical path.
  • the controller establishes a connection in the optical switching network by controlling the optical opening in the optical switching network according to the request signal sent by the first transmitter for requesting to send the optical signal to the second receiver. a second optical path of the first transmitter and the second receiver, and transmitting, according to the request signal, a reset signal for indicating that it is reset to an initial state to the second receiver, while transmitting the reset signal Or sending an acknowledgment signal for instructing the second transmitter to transmit the optical signal to the second receiver through the second optical path, so that the reset signal can be sent to the second receiver in time, so that the second receiver
  • the resetting is completed before receiving the optical signal sent by the first transmitter, which can effectively shorten the response time of the second receiver to receive a new optical signal, thereby improving the utilization of the optical switching network.
  • the optical signal transmitted by the transmitter to the receiver may be referred to as a burst.
  • the first transmitter before transmitting the request signal, may be in a state of transmitting an optical signal to the first receiver, or may be in a state of not transmitting an optical signal to any receiver.
  • the state of the embodiment of the present invention is not limited thereto.
  • S120 and S130 do not have a strict sequence relationship.
  • the controller may first send the reset signal to the second receiver, and then Establishing a second optical path connecting the first transmitter and the second receiver in the optical switching network by controlling the optical switch; or establishing the second optical path according to the request signal, and sending the second optical path to the second receiver
  • the reset signal is not limited in this embodiment of the present invention.
  • S140 is executed after S120, that is, the controller establishes the first in the determination.
  • an acknowledgment signal is sent to the first transmitter to instruct the first transmitter to transmit an optical signal to the second receiver through the second optical path.
  • optical switching network may have many different types.
  • the optical switching network composed of different types of optical switches may also have different ways of establishing the optical path.
  • the above description in S120 is only used as a description. Examples are not limiting.
  • the optical switching network involved in the embodiment of the present invention may be an optical network composed of an optical switch whose switching speed is less than 1 microsecond, such as a silicon optical switch driven by an electro-optical effect.
  • the controller establishes a connection between the first transmitter and the second receiver in the optical switching network by controlling an optical switch in the optical switching network according to the request signal.
  • the second light path includes:
  • the controller establishes a second optical path connecting the first transmitter and the second receiver in the optical switching network by controlling an optical switch in the optical switching network, if the second optical path is determined to be idle. .
  • the controller first determines a second of the optical switching network that connects the first transmitter and the second receiver. Whether the optical path is occupied, or whether the second optical path conflicts with other optical paths in the optical switching network. In the case of confirming that the second optical path is not occupied, the second optical path is established in the optical switching network by controlling the optical switch in the optical switching network.
  • the second optical path connecting the first transmitter and the second receiver in the optical switching network is not necessarily a path, for example, the optical switch on the second optical path has It may be disconnected, that is, the second optical path cannot transmit the optical signal.
  • the controller controls the optical switch in the optical switching network to make the second optical path become a path according to the request signal.
  • the second optical path may be established, and the first transmitter and the second receiver are The optical signal can be transmitted through the second optical path.
  • the controller establishes the second optical path in the optical switching network by controlling an optical switch in the optical switching network.
  • the controller may directly control the optical switch, or may be indirectly controlled.
  • the light-on for example, may send a control signal to the optical switching network, the control signal is used to control the optical switch to establish the second optical path, or may send a trigger signal to the optical switching network, the trigger signal is used to trigger the light.
  • the control module of the switching network controls the optical switch to establish the second optical path.
  • the controller controls the light according to the request signal.
  • An optical switch in the switching network establishes the second optical path in the optical switching network.
  • a control signal may be sent to the optical switching network for establishing the second optical path.
  • the controller establishes a connection between the first transmitter and the second receiver in the optical switching network by controlling an optical switch in the optical switching network according to the request signal.
  • the second light path includes:
  • the controller sends a control signal to the optical switching network according to the request signal, where the control signal is used to control an optical switch of the optical switching network to establish a connection between the first transmitter and the second receiving in the optical switching network.
  • the second light path of the machine is used to control an optical switch of the optical switching network to establish a connection between the first transmitter and the second receiving in the optical switching network.
  • control signal sent by the controller to the optical switching network can be directly used to control the optical switch, for example, adjusting the configuration relationship between the entrance and the exit of the optical switch to establish the second optical path.
  • the control signal sent by the controller to the optical switching network may also serve as a trigger signal for triggering control of optical opening in the optical switching network.
  • the optical switching network includes a control circuit that receives the control signal sent by the controller. And controlling the corresponding optical switch to establish the second optical path.
  • the controller sends a second optical path to the second receiver to indicate that the reset is The initial state of the reset signal.
  • the controller sends a reset signal to the second receiver for indicating that it is reset to the initial state, and the controller sends the reset signal according to the request signal sent by the first transmitter. Therefore, the accuracy of the reset signal can be guaranteed.
  • the embodiment of the present invention utilizes the advantage of the presence of the controller in the optical switching network, and the controller provides the reset signal required by the second receiver, and utilizes the ready-made device reasonably and fully, compared to receiving in the prior art.
  • the signal detection module is additionally added inside the machine to trigger the reset signal, and the embodiment of the invention effectively reduces the equipment cost.
  • the method 100 further includes:
  • the controller disconnects the first optical path by controlling an optical switch in the optical switching network according to the request signal.
  • the first between the first transmitter and the first receiver may be disconnected
  • the optical path for example, disconnects the optical switch on the first optical path.
  • FIG. 3 shows another schematic flowchart of a signal transmission method according to an embodiment of the present invention.
  • the controller of the optical switching network waits for a request signal from the transmitter; in S22, Receiving, by the controller, a request signal for requesting to send an optical signal to the second receiver, where the first optical path connecting the first transmitter and the first receiver is established in the optical switching network
  • the control determines whether the second optical path connecting the first transmitter and the second receiver in the optical switching network is idle, if not, then goes to S24, S25, and S26, and if it is determined that the second optical path is not idle, For example, if there is a conflict with other optical paths in the optical switching network, then go to S21; in S24, the controller sends a reset signal to the second receiver for indicating that it is reset to the initial state; in S25, the The controller establishes the second optical path in the optical switching network by controlling an optical switch in the optical switching network; in S26, the controller sends a signal to the first transmitter to
  • the controller After determining to complete the optical signal transmission between the first transmitter and the second receiver, the controller returns to the state of waiting for the request signal from the transmitter side, that is, after S28, it proceeds to S21.
  • FIG. 4 is a schematic block diagram of a receiver in an embodiment of the present invention. As shown in FIG. 3, the receiver includes:
  • a photo detector (Photo Detector, abbreviated as "PD") for receiving an optical signal and converting it into a photocurrent.
  • the photodetector is specifically a photodiode;
  • a transimpedance amplifier (Tran Impedance Amplifier, abbreviated as "TIA") for converting a current outputted by the PD into a voltage signal and outputting a voltage signal, the transimpedance amplifier TIA, specifically a preamplifier;
  • a limited amplifier (Limited Amplifier, referred to as "LA") for amplifying a voltage signal output by the TIA to a voltage signal having a uniform output level;
  • CDR Clock and Data Recovery
  • the main process of receiving the optical signal by the receiver is: first, converting the received optical signal into an electrical signal (corresponding to the function of the PD); and in the second step, amplifying the electrical signal to a standard signal level (corresponding to The functions of the TIA and LA), in addition, the clock that needs to recover the signal (corresponding to the function of the CDR).
  • the process by which the receiver amplifies the electrical signal to a standard level signal in the second step includes first stage amplification (usually done by the TIA) and second stage amplification (usually done by LA).
  • the first stage Larger is to choose different magnification amplification signals, for example, TIA has three (or more or less) magnification: high magnification, medium magnification and small magnification.
  • the signals are sequentially amplified according to the order of magnification from the largest to the smallest, for example, the signal is amplified first by a high magnification, and if the amplified signal exceeds the threshold, the magnification is adjusted to a medium magnification, and so on, until the amplified signal does not exceed the threshold.
  • the second stage amplification continuously feeds back the magnification by detecting the maximum and minimum values of the signal.
  • LA records the maximum and minimum values of the current detection signal.
  • Rx1 is in the state of receiving the signal (signal 1) transmitted by Tx1 before receiving the signal transmitted by Tx4 (ie, signal 2), so the parameter settings of TIA, LA, and CDR of Rx1 are
  • the magnification of the TIA of Rx1 is set at the mode of the medium magnification (assuming that the magnification of the TIA of Rx1 includes the high magnification, the medium magnification, the small magnification, the third gear), and the LA of the Rx1 holds the signal 1
  • the CDR of Rx1 recovers the clock of signal 1.
  • Rx1 receives the signal 2 transmitted by Tx4, the second step of the above operation cannot be successfully performed on the signal 2, that is, the signal 2 cannot be effectively received.
  • Rx1 must be reset to its initial state, resetting the RX1's TIA's magnification to a high rate, clearing the history of Rx1's LA, and initializing the Rx1's CDR to achieve a new signal ( For example, the effective reception of signal 2) in this example.
  • the receiver when the receiver needs to receive a new signal, it needs to reset its receiver to the initial state. Specifically, it is necessary to reset the LA of the receiver, that is, clear the history of the LA; the TIA of the receiver needs to be reset. , that is, to reset its magnification to the highest level of the magnification gear; in addition, the CDR of the receiver needs to be initialized.
  • resetting the receiver includes resetting the limiting amplifier LA of the receiver, or also including resetting the transimpedance amplifier TIA or clock data recovery CDR.
  • the controller may be connected to the reset port of the limiting amplifier LA of the receiver to implement the reset signal to the reset port of the limiting amplifier LA of the receiver.
  • the controller can also be connected to the reset port of the transimpedance amplifier TIA and the reset port of the clock data recovery CDR to directly transmit the reset signal to the transimpedance amplifier TIA of the receiver a reset port and a reset port of the clock data recovery CDR to implement resetting of the receiver; or the controller can be connected to the reset signal generator of the receiver to generate a reset signal through the receiver The reset signal is input to the reset port of the transimpedance amplifier TIA, the reset port of the limiting amplifier LA, and the reset port of the clock data recovery CDR, which is not limited in this embodiment of the present invention.
  • the controller 130 sends, according to the request signal, a reset signal for indicating that the second receiver is reset to an initial state, including:
  • the controller sends the reset signal to a reset port of the limiting amplifier LA of the second receiver according to the request signal.
  • the controller is coupled to a reset port of the limiting amplifier LA of the second receiver to transmit the reset signal thereto.
  • the controller 130 sends, according to the request signal, a reset signal for indicating that the second receiver is reset to an initial state, including:
  • the controller sends the reset signal to the reset port of the transimpedance amplifier TIA of the second receiver and/or the reset port of the clock data recovery CDR according to the request signal.
  • the controller is coupled to a reset port of the transimpedance amplifier TIA of the second receiver and/or a reset port of the clock data recovery CDR to transmit the reset signal thereto.
  • the controller 130 sends, according to the request signal, a reset signal for indicating that the second receiver is reset to an initial state, including:
  • the controller sends the reset signal to the reset signal generator of the second receiver according to the request signal.
  • the controller is coupled to the reset signal generator of the second receiver, and the reset signal is transmitted to the second receiver by the reset signal generator.
  • the controller sends a reset signal to the second receiver according to the request signal sent by the transmitter, and sends an acknowledgement signal to the transmitter after the reset signal or at the same time, thereby making the first
  • the two receivers have been reset to the initial state, which can effectively shorten the interval time for the second receiver to receive signals transmitted by different transmitters, that is, shorten the response time for receiving new signals. , thereby improving the utilization of the optical switching network.
  • the reset signal is generated by the controller of the optical switching network and sent to the receiver, which ensures the reliability of the reset signal.
  • the controller that exists in the optical switching network itself is used to send a reset signal to the second receiver, and the second receiver is not required to perform additional detection, so that the device can be reset to the initial state in time. low cost.
  • the second receiver is a DC coupled burst receiver.
  • the burst receiver can complete the signal reception in a shorter time when the optical signals from different transmitters are successively received, compared with the conventional receiver, mainly in TIA and LA.
  • the signal can be amplified faster and the CDR can recover the clock faster.
  • the DC coupled burst receiver is relative to the AC coupled burst receiver with no capacitive connection between the TIA and LA of the DC coupled burst receiver (as shown in Figure 4).
  • the DC-coupled burst receiver does not filter out the DC portion of the signal, so the signal is processed faster.
  • the controller establishes a connection in the optical switching network by controlling the optical opening in the optical switching network according to the request signal sent by the first transmitter for requesting to send the optical signal to the second receiver. a second optical path of the first transmitter and the second receiver, and transmitting, according to the request signal, a reset signal for indicating that it is reset to an initial state to the second receiver, while transmitting the reset signal Or subsequently transmitting an acknowledgment signal to the first transmitter for instructing it to transmit an optical signal to the second receiver through the second optical path, such that the second receiver resets before receiving the optical signal transmitted by the first transmitter In the initial state, the response time of the second receiver to receive a new optical signal can be effectively shortened, thereby improving the utilization of the optical switching network.
  • the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention.
  • the implementation process constitutes any limitation.
  • FIG. 5 is a schematic flowchart of a signal transmission method 200 according to an embodiment of the present invention.
  • the method is applied to an optical transmission system, where the optical transmission system includes an optical switching network and control for controlling the optical switching network. And a first optical path connecting the first transmitter and the first receiver in the optical switching network, the method may be performed by, for example, a first transmitter, as shown in FIG. 5, the method 200 includes:
  • the first transmitter sends a request signal to the controller, where the request is used to request to send an optical signal to the second receiver.
  • the first transmitter receives an acknowledgment message sent by the controller for indicating that the optical signal is sent to the second receiver by using the second optical path, where the acknowledgment signal is sent by the controller to the second receiver for indication.
  • the second optical path is an optical path connecting the first transmitter and the second receiver in the optical switching network;
  • the first transmitter sends an optical signal to the second receiver through a second optical path in the optical switching network.
  • the first transmitter after receiving the acknowledgement signal sent by the controller, the first transmitter indicates that the second optical path between the transmitter and the second receiver has been established in the optical switching network, so the transmitter A signal is transmitted to the second receiver through the second optical path. Since the controller sends an acknowledgment signal to the first transmitter after transmitting the reset signal to the second receiver, the second transmitter receives the signal before the second receiver receives the second receiver. The machine has been reset to be able to effectively receive the initial state of the signal transmitted by the first transmitter, and therefore, the signal transmission efficiency can be effectively improved.
  • the method 200 further includes:
  • the first transmitter continues to send the request signal to the controller without receiving the acknowledgment signal.
  • the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention.
  • the implementation process constitutes any limitation.
  • a signal transmission method according to an embodiment of the present invention is described below from the perspective of a receiver.
  • FIG. 6 is a schematic flowchart of an optical switching network-based signal transmission method 300 according to an embodiment of the present invention.
  • the method is applied to an optical transmission system, where the optical transmission system includes an optical switching network and is used for the optical switching.
  • a network-controlled controller wherein a first optical path connecting the first transmitter and the first receiver is present in the optical switching network, the method being executable, for example, by a second receiver, the method 300 comprising:
  • the second receiver receives a reset signal sent by the controller to indicate that the second receiver is reset to an initial state, where the reset signal is sent by the controller according to the first transmitter.
  • the second receiver is reset to an initial state according to the reset signal.
  • the second receiver receives the optical signal sent by the first transmitter by using a second optical path, where the second optical path is an optical path connecting the first transmitter and the second receiver in the optical switching network.
  • the receiver before receiving the optical signal sent by the transmitter, the receiver has completed the reset according to the reset signal sent by the controller, and can quickly and effectively receive the optical signal sent by the transmitter, that is, complete the weight in time.
  • the initial state can effectively shorten the response time of the receiver to receive a new optical signal, thereby improving the utilization of the optical switching network.
  • the receiver involved in the embodiment of the present invention is as shown in FIG. 4, and is specifically described above, and details are not described herein again.
  • the second receiver of the S310 receives the reset signal that is sent by the controller of the optical switching network to indicate that the second receiver is reset to the initial state, and includes:
  • the second receiver receives the reset signal through a reset port of the limiting amplifier LA.
  • the second receiver of the S310 receives the reset signal that is sent by the controller of the optical switching network to indicate that the second receiver is reset to the initial state, and includes:
  • the second receiver receives the reset signal by a reset port of the transimpedance amplifier TIA and/or a reset port of the clock data recovery CDR.
  • the controller is coupled to a reset port of the transimpedance amplifier TIA of the second receiver and/or a reset port of the clock data recovery CDR to transmit the reset signal thereto.
  • the second receiver of the S310 receives the reset signal that is sent by the controller of the optical switching network to indicate that the second receiver is reset to the initial state, and includes:
  • the second receiver receives the reset signal through a reset signal generator of the second receiver.
  • the controller is coupled to the reset signal generator of the second receiver, and the reset signal is transmitted to the second receiver by the reset signal generator.
  • the receiver before receiving the optical signal sent by the transmitter, the receiver has completed the reset according to the reset signal sent by the controller, and can quickly and effectively receive the optical signal sent by the transmitter, that is, complete the weight in time.
  • the initial state can effectively shorten the response time of the receiver to receive a new optical signal, thereby improving the utilization of the optical switching network.
  • the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention.
  • the implementation process constitutes any limitation.
  • FIG. 7 shows a schematic block diagram of a controller 400 applied to an optical transmission system including an optical switching network for the light, according to an embodiment of the present invention.
  • the switching network performs control, wherein a first optical path connecting the first transmitter and the first receiver exists in the optical switching network, and the controller includes:
  • the receiving module 410 is configured to receive a request signal sent by the first transmitter, where the request signal is used to request to send an optical signal to the second receiver;
  • the optical path establishing module 420 is configured to establish, according to the request signal received by the receiving module, a second switch connecting the first transmitter and the second receiver in the optical switching network by controlling an optical switch in the optical switching network.
  • the sending module 430 is configured to send, according to the request signal received by the receiving module, a reset signal for indicating that the second receiver is reset to an initial state, to the second receiver;
  • the sending module 430 is further configured to: after transmitting the reset signal or simultaneously, send an acknowledgment signal to the first transmitter, where the acknowledgment signal is used to indicate that the first transmitter passes the second optical path to the second receiver Send an optical signal.
  • the controller establishes a connection in the optical switching network by controlling the optical opening in the optical switching network according to the request signal sent by the first transmitter for requesting to send the optical signal to the second receiver. a second optical path of the first transmitter and the second receiver, and transmitting, according to the request signal, a reset signal for indicating that it is reset to an initial state to the second receiver, while transmitting the reset signal Or sending an acknowledgment signal for instructing the second transmitter to transmit the optical signal to the second receiver through the second optical path, so that the reset signal can be sent to the second receiver in time, so that the second receiver
  • the resetting to the initial state before receiving the optical signal sent by the first transmitter can effectively shorten the response time of the second receiver to receive a new optical signal, thereby improving the utilization of the optical switching network.
  • the optical path establishing module is specifically configured to establish the second optical path when it is determined that the second optical path is idle.
  • the sending module is specifically configured to send the reset signal to a reset port of the limiting amplifier LA of the second receiver according to the request signal.
  • the controller is coupled to a reset port of the limiting amplifier LA of the second receiver to transmit the reset signal thereto.
  • the sending module is specifically configured to restore the weight of the CDR to the reset port and/or the clock data of the transimpedance amplifier TIA of the second receiver according to the request signal. Set the port to send the reset signal.
  • the controller is coupled to a reset port of the transimpedance amplifier TIA of the second receiver and/or a reset port of the clock data recovery CDR to transmit the reset signal thereto.
  • the sending module is specifically configured to send the reset signal to the reset signal generator of the second receiver according to the request signal.
  • the controller is coupled to the reset signal generator of the second receiver, and the reset signal is transmitted to the second receiver by the reset signal generator.
  • the controller further includes:
  • the optical path disconnecting module is configured to disconnect the first optical path by controlling an optical switch in the optical switching network according to the request signal.
  • the second receiver is a burst receiver using DC coupling.
  • the controller establishes a connection in the optical switching network by controlling the optical opening in the optical switching network according to the request signal sent by the first transmitter for requesting to send the optical signal to the second receiver. a second optical path of the first transmitter and the second receiver, and transmitting, according to the request signal, a reset signal for indicating that it is reset to an initial state to the second receiver, while transmitting the reset signal Or sending an acknowledgment signal for instructing the second transmitter to transmit the optical signal to the second receiver through the second optical path, so that the reset signal can be sent to the second receiver in time, so that the second receiver
  • the resetting to the initial state before receiving the optical signal sent by the first transmitter can effectively shorten the response time of the second receiver to receive a new optical signal, thereby improving the utilization of the optical switching network.
  • optical switching network based signal transmission controller 400 may correspond to the controller of the optical switching network in the signal transmission method of the embodiment of the present invention, and the above-described sum of the respective modules in the controller 500
  • the other operations and/or functions are respectively implemented in order to implement the corresponding processes of the respective methods in FIG. 1 to FIG. 6 , and are not described herein again for brevity.
  • an embodiment of the present invention further provides a controller 500, where the controller 500 is applied to an optical transmission system, where the optical transmission system includes an optical switching network, and the controller is configured to control the optical switching network.
  • the controller 500 includes a processor 510, a memory 520, a bus system 530, a receiver 540, and a transmitter 550.
  • the processor 510, the memory 520, the receiver 540, and the transmitter 550 are connected by a bus system 530 for storing instructions, and the processor 510 is configured to store instructions. Instructions for executing the memory 520 are stored to control the receiver 540 to receive signals and to control the transmitter 550 to transmit signals.
  • the receiver 540 is configured to receive a request signal sent by the first transmitter, where the request signal is used to request to send an optical signal to a second receiver, where the processor 510 is configured to control the An optical switch in the optical switching network, in which a second optical path connecting the first transmitter and the second receiver is established; the transmitter 550 is configured to send, according to the request signal, the second receiver a reset signal for indicating that the second receiver is reset to an initial state; after transmitting the reset signal or simultaneously, transmitting an acknowledgment signal to the first transmitter, the acknowledgment signal is used to indicate that the first transmitter passes The second optical path transmits an optical signal to the second receiver.
  • the controller establishes a connection in the optical switching network by controlling the optical opening in the optical switching network according to the request signal sent by the first transmitter for requesting to send the optical signal to the second receiver. a second optical path of the first transmitter and the second receiver, and transmitting, according to the request signal, a reset signal for indicating that it is reset to an initial state to the second receiver, while transmitting the reset signal Or sending an acknowledgment signal for instructing the second transmitter to transmit the optical signal to the second receiver through the second optical path, so that the reset signal can be sent to the second receiver in time, so that the second receiver
  • the resetting to the initial state before receiving the optical signal sent by the first transmitter can effectively shorten the response time of the second receiver to receive a new optical signal, thereby improving the utilization of the optical switching network.
  • the processor 510 is specifically configured to establish the second optical path if it is determined that the second optical path is idle.
  • the transmitter 550 is specifically configured to send the reset signal to the reset port of the limiting amplifier LA of the second receiver according to the request signal.
  • the transmitter 550 is connected to a reset port of the limiting amplifier LA of the second receiver.
  • the transmitter 550 is specifically configured to send, according to the request signal, a reset port of the transimpedance amplifier TIA of the second receiver and/or a reset port of the clock data recovery CDR.
  • the reset signal is specifically configured to send, according to the request signal, a reset port of the transimpedance amplifier TIA of the second receiver and/or a reset port of the clock data recovery CDR. The reset signal.
  • the transmitter 550 is coupled to a reset port of the transimpedance amplifier TIA of the second receiver and/or a reset port of the clock data recovery CDR.
  • the transmitter 550 is specifically configured to: according to the request signal, The reset signal is sent to the reset signal generator of the second receiver.
  • the transmitter 550 is coupled to the reset signal generator of the second receiver.
  • the processor 510 is specifically configured to: according to the request signal, disconnect the first optical path by controlling an optical switch in the optical switching network.
  • the second receiver is a burst receiver using DC coupling.
  • the processor 510 may be a central processing unit (“CPU"), and the processor 510 may also be other general-purpose processors, digital signal processors (DSPs). , an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, and the like.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the memory 520 can include read only memory and random access memory and provides instructions and data to the processor 510. A portion of the memory 520 may also include a non-volatile random access memory. For example, the memory 520 can also store information of the device type.
  • the bus system 530 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus. However, for clarity of description, various buses are labeled as bus system 530 in the figure.
  • each step of the above method may be completed by an integrated logic circuit of hardware in the processor 510 or an instruction in a form of software.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 520, and the processor 510 reads the information in the memory 520 and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.
  • the controller establishes a connection in the optical switching network by controlling the optical opening in the optical switching network according to the request signal sent by the first transmitter for requesting to send the optical signal to the second receiver. a second optical path of the first transmitter and the second receiver, and transmitting, according to the request signal, a reset signal for indicating that it is reset to an initial state to the second receiver, while transmitting the reset signal Or sending an acknowledgment signal for instructing the second transmitter to transmit the optical signal to the second receiver through the second optical path, so that the reset signal can be sent to the second receiver in time, so that the second receiver Reset to the optical signal sent by the first transmitter before receiving In the initial state, the response time of the second receiver to receive a new optical signal can be effectively shortened, thereby improving the utilization of the optical switching network.
  • controller 500 may correspond to a controller of an optical switching network in the signal transmission method of the embodiment of the present invention, and may correspond to the controller 400 according to an embodiment of the present invention, and the controller 500
  • the above and other operations and/or functions of the respective modules in order to implement the respective processes of the respective methods in FIG. 1 to FIG. 6 are omitted for brevity.
  • the embodiment of the present invention further provides a signal transmission system 600 based on an optical switching network, where the system 600 includes:
  • An optical switching network 610 having a first optical path connecting the first transmitter 630 and the first receiver 640 in the optical switching network;
  • the controller 620 is configured to control the optical switching network 610.
  • the controller 620 is specifically configured to receive a request signal sent by the first transmitter 630, where the request signal is used to request to send an optical signal to the second receiver 650.
  • a second optical path connecting the first transmitter 630 and the second receiver 650 is established in the optical switching network 610 by controlling an optical switch in the optical switching network 610; Sending a reset signal for indicating that the second receiver 650 is reset to an initial state to the second receiver 650; sending an acknowledgement signal to the first transmitter 630 after transmitting the reset signal or the same
  • the signal is used to instruct the first transmitter 630 to transmit an optical signal to the second receiver 650 through the second optical path.
  • the controller establishes a connection in the optical switching network by controlling the optical opening in the optical switching network according to the request signal sent by the first transmitter for requesting to send the optical signal to the second receiver. a second optical path of the first transmitter and the second receiver, and transmitting, according to the request signal, a reset signal for indicating that it is reset to an initial state to the second receiver, while transmitting the reset signal Or sending an acknowledgment signal for instructing the second transmitter to transmit the optical signal to the second receiver through the second optical path, so that the reset signal can be sent to the second receiver in time, so that the second receiver
  • the resetting to the initial state before receiving the optical signal sent by the first transmitter can effectively shorten the response time of the second receiver to receive a new optical signal, thereby improving the utilization of the optical switching network.
  • the first transmitter 620 is configured to send, to the controller 610, a request signal for transmitting an optical signal to the second receiver 640; according to the acknowledgement signal sent by the controller 620, the second optical path is used to The second receiver 640 transmits an optical signal;
  • the second receiver 620 is configured to reset to an initial state according to the reset signal;
  • the two optical paths receive the optical signal sent by the first transmitter 620.
  • the controller is specifically configured to establish the second optical path when it is determined that the second optical path is idle.
  • the controller is specifically configured to send the reset signal to a reset port of the limiting amplifier LA of the second receiver according to the request signal.
  • the controller is coupled to a reset port of the limiting amplifier LA of the second receiver to transmit the reset signal thereto.
  • the controller is specifically configured to send, according to the request signal, a reset port of the transimpedance amplifier TIA of the second receiver and/or a reset port of the clock data recovery CDR.
  • the reset signal is specifically configured to send, according to the request signal, a reset port of the transimpedance amplifier TIA of the second receiver and/or a reset port of the clock data recovery CDR.
  • the controller is coupled to a reset port of the transimpedance amplifier TIA of the second receiver and/or a reset port of the clock data recovery CDR to transmit the reset signal thereto.
  • the controller is specifically configured to send the reset signal to the reset signal generator of the second receiver according to the request signal.
  • the controller is coupled to the reset signal generator of the second receiver, and the reset signal is transmitted to the second receiver by the reset signal generator.
  • the controller is further configured to: according to the request signal, disconnect the first optical path by controlling an optical switch in the optical switching network.
  • the at least one transmitter is a burst transmitter
  • the at least two receivers are burst receivers that use DC coupling.
  • the controller establishes a connection in the optical switching network by controlling the optical opening in the optical switching network according to the request signal sent by the first transmitter for requesting to send the optical signal to the second receiver. a second optical path of the first transmitter and the second receiver, and transmitting, according to the request signal, a reset signal for indicating that it is reset to an initial state to the second receiver, while transmitting the reset signal Or sending an acknowledgment signal for instructing the second transmitter to transmit the optical signal to the second receiver through the second optical path, so that the reset signal can be sent to the second receiver in time, so that the second receiver
  • the resetting to the initial state before receiving the optical signal sent by the first transmitter can effectively shorten the response time of the second receiver to receive a new optical signal, thereby improving the utilization of the optical switching network.
  • the controller 610 in the optical switching network based signal transmission system 600 may correspond to the controller of the optical switching network in the signal transmission method of the embodiment of the present invention, and may correspond to the present invention.
  • the controllers 400 and 500 of the embodiment, the first transmitter 620 in the system 600 may correspond to the first transmitter in the signal transmission method of the embodiment of the present invention, and the second receiver 640 in the system 600 may correspond to the present invention A second receiver in the signal transmission method of the embodiment.
  • the above and other operations and/or functions of the respective modules in the signal transmission system 600 are respectively omitted in order to implement the corresponding processes of the respective methods in FIG. 1 to FIG. 6 for brevity.
  • FIG. 10 shows an optical switching network based signal transmission system 700 according to an embodiment of the present invention.
  • the system 700 includes:
  • Optical switching network 710 controller 720, at least one transmitter 730 (showing four transmitters Tx1 through Tx4 in FIG. 10) and at least one receiver 740 (showing four receivers Rx1 through Rx4 in FIG. 10)
  • the transmitter 730 and the receiver 740 are connected to the optical switching network 710 through an optical path (optical fiber or optical waveguide), and the transmitter 730 and the receiver 740 are connected to the controller 720 through a circuit or an optical path, and the controller 720 performs circuit and optical switching.
  • Network 710 is connected.
  • Tx4 transmits a signal to RX4, Tx1 transmits a signal to Rx1, and at time t2, Tx4 needs to communicate with Rx1, and Tx4 transmits a request signal to controller 720, and controller 720 receives After requesting the signal, confirm that the optical path of Tx4 to Rx1 is not occupied, the controller 720 sends a control signal to the optical switching network, configures the optical path of Tx4 to Rx1, and simultaneously sends a reset signal to Rx1, indicating that Rx1 is reset to the initial state; After the reset signal or at the same time, the acknowledgment signal is returned to Tx4 (the same line is used as the Tx4 transmission request signal, and two lines are drawn in Fig. 11 for easier understanding). After receiving the acknowledgment signal, Tx4 sends the optical burst packet to Rx1 to complete a burst transmission.
  • optical switching network 710 in FIG. 10 corresponds to the optical switching network 610 in FIG. 6, the controller 720 in FIG. 10 corresponds to the controller 620 in FIG. 9, and at least one transmitter 730 in FIG. 10 includes a map.
  • the first transmitter 630 of 9, the at least one receiver 740 of FIG. 10 includes the first receiver 640 and the second receiver 650 of FIG.
  • the controller establishes a connection in the optical switching network by controlling the optical opening in the optical switching network according to the request signal sent by the first transmitter for requesting to send the optical signal to the second receiver.
  • a second optical path of the first transmitter and the second receiver and transmitting, according to the request signal, a reset signal for indicating that it is reset to an initial state to the second receiver, while transmitting the reset signal Or sending to the first transmitter to indicate that it passes the second optical path
  • the second receiver sends the acknowledgement signal of the optical signal, so that the reset signal can be sent to the second receiver in time, so that the second receiver is reset to the initial state before receiving the optical signal sent by the first transmitter.
  • the response time of the second receiver to receive a new optical signal can be effectively shortened, thereby improving the utilization rate of the optical switching network.
  • the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention.
  • the implementation process constitutes any limitation.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product.
  • the technical solution of the present invention which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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Abstract

本发明实施例提供一种信号传输方法、控制器和信号传输系统，该方法包括：控制器接收第一发射机发送的请求信号，该请求信号用于请求向第二接收机发送光信号；该控制器根据该请求信号，通过控制光交换网络中的光开关，在该光交换网络中建立连接该第一发射机与该第二接收机的第二光路；该控制器根据该请求信号向该第二接收机发送用于指示该第二接收机重置为初始状态的重置信号；该控制器在发送该重置信号之后或者同时，向该第一发射机发送确认信号，该确认信号用于指示该第一发射机通过该第二光路向该第二接收机发送光信号。在本发明实施例中，能够实现及时向第二接收机发送该重置信号，能够有效缩短该接收机对接收新的光信号的响应时间。

Description

一种信号传输方法、控制器和信号传输系统 技术领域
本发明实施例涉及通信领域，并且更具体地，涉及一种信号传输方法、控制器和信号传输系统。
背景技术
在光交换网络系统中，多个发射机Tx和接收机Rx通过光交换网络(Optical Switching Network，简称为“OSN”)连接，发射机和接收机之间的光路随着光交换网络的切换而发生变化，发射机和接收机之间的传输模式为突发传输模式。工作在突发传输模式中的发射机和接收机称为突发发射机和突发接收机，在采用突发传输模式传输的信号可称为突发包(Burst)。
假设光交换网络当前时刻的状态为：发射机Tx1与接收机Rx1之间的光路建立，Tx1向Rx1发送突发包；下一时刻光交换网络的状态切换为：发射机Tx1与接收机Rx1之间的光路切断，同时发射机Tx4与接收机Rx1之间的光路建立，由发射机Tx4向接收机Rx1发送突发包，但接收机Rx1在此之前，处于接收发射机Tx1发送的突发包的状态，所以该接收机Rx1的参数设置仍然是针对接收Tx1发出的突发包的。该接收机Rx1只有重置(Reset)为初始状态才能够实现有效接收新的信号(即Tx4发送的突发包)。
当前技术中，通常是在接收机侧部署检测模块，当该检测模块检测到来自新的发射机的信号时，触发该接收机重置为初始状态。可知，在当前技术中，直到发射机发出的信号到达接收机之后，才会触发接收机重置为初始状态，导致接收机实现有效接收新的信号的响应时间较长，光交换网络的利用率较低。
发明内容
本发明实施例提供一种信号传输方法、控制器和信号传输系统，能够及时向接收机发送重置信号，从而有效缩短接收机接收新的信号的响应时间。
第一方面，提供了一种信号传输方法，该方法应用于光传输系统，该光传输系统包括光交换网络以及用于对该光交换网络进行控制的控制器，其中，在该光交换网络中存在连接第一发射机与第一接收机的第一光路，该方 法包括：
该控制器接收该第一发射机发送的请求信号，该请求信号用于请求向第二接收机发送光信号；
该控制器根据该请求信号，通过控制该光交换网络中的光开关，在该光交换网络中建立连接该第一发射机与该第二接收机的第二光路；
该控制器根据该请求信号向该第二接收机发送用于指示该第二接收机重置为初始状态的重置信号；
该控制器在发送该重置信号之后或者同时，向该第一发射机发送确认信号，该确认信号用于指示该第一发射机通过该第二光路向该第二接收机发送光信号。
结合第一方面，在第一方面的第一种可能的实现方式中，该控制器根据该请求信号，通过更改该光交换网络中光开关的状态，建立第二光路，包括：
该控制器在确定该第二光路空闲的情况下，建立该第二光路。
结合第一方面或第一方面的第一种可能的实现方式，在第一方面的第二种可能的实现方式中，该控制器根据该请求信号向该第二接收机发送用于指示该第二接收机重置为初始状态的重置信号，包括：
该控制器根据该请求信号，向该第二接收机的限幅放大器LA的重置端口发送该重置信号。
结合第一方面的第二种可能的实现方式，在第一方面的第三种可能的实现方式中，该控制器根据该请求信号向该第二接收机发送用于指示该第二接收机重置为初始状态的重置信号，包括：
该控制器根据该请求信号，向该第二接收机的跨阻放大器TIA的重置端口和/或时钟数据恢复CDR的重置端口发送该重置信号。
结合第一方面或第一方面的第一种可能的实现方式，在第一方面的第四种可能的实现方式中，该控制器根据该请求信号向该第二接收机发送用于指示该第二接收机重置为初始状态的重置信号，包括：
该控制器根据该请求信号，向该第二接收机的重置信号生成器发送该重置信号。
结合第一方面及其上述实现方式，在第一方面的第五种实现方式中，该方法还包括：
该控制器根据该请求信号，通过控制该光交换网络中的光开关，断开该 第一光路。
结合第一方面及其上述实现方式，在第一方面的第六种实现方式中，该第二接收机为使用直流耦合的突发接收机。
第二方面，提供了一种控制器，该控制器应用于光传输系统，该光传输系统包括光交换网络，该控制器用于对该光交换网络进行控制，其中，在该光交换网络中存在连接第一发射机与第一接收机的第一光路，该控制器包括：
接收模块，用于接收第一发射机发送的请求信号，该请求信号用于请求向第二接收机发送光信号；
光路建立模块，用于根据该接收模块接收的该请求信号，通过控制该光交换网络中的光开关，在该光交换网络中建立连接该第一发射机与该第二接收机的第二光路；
发送模块用于，根据该接收模块接收的该请求信号向该第二接收机发送用于指示该第二接收机重置为初始状态的重置信号；
该发送模块还用于，在发送该重置信号之后或者同时，向该第一发射机发送确认信号，该确认信号用于指示该第一发射机通过该第二光路向该第二接收机发送光信号。
结合第二方面，在第二方面的第一种可能的实现方式中，该光路建立模块具体用于，在确定该第二光路空闲的情况下，建立该第二光路。
结合第二方面或第二方面的第一种可能的实现方式，在第二方面的第二种可能的实现方式中，该发送模块具体用于，根据该请求信号，向该第二接收机的限幅放大器LA的重置端口发送该重置信号。
结合第二方面的第二种可能的实现方式，在第二方面的第三种可能的实现方式中，该发送模块具体用于，根据该请求信号，向该第二接收机的跨阻放大器TIA的重置端口和/或时钟数据恢复CDR的重置端口发送该重置信号。
结合第二方面或第二方面的第一种可能的实现方式，在第二方面的第四种可能的实现方式中，该发送模块具体用于，根据该请求信号，向该第二接收机的重置信号生成器发送该重置信号。
结合第二方面及其上述实现方式，在第二方面的第五种实现方式中，该控制器还包括：
光路断开模块，用于根据该请求信号，通过控制该光交换网络中的光开关，断开该第一光路。
结合第二方面及其上述实现方式，在第二方面的第六种实现方式中，该第二接收机为使用直流耦合的突发接收机。
第三方面，提供了一种信号传输系统，该系统包括：
光交换网络，在该光交换网络中存在连接第一发射机与第一接收机的第一光路；
控制器，用于对该光交换网络进行控制，该控制器具体用于，接收该第一发射机发送的请求信号，该请求信号用于请求向第二接收机发送光信号；根据该请求信号，通过控制该光交换网络中的光开关，在该光交换网路中建立连接该第一发射机与该第二接收机的第二光路；根据该请求信号向该第二接收机发送用于指示该第二接收机重置为初始状态的重置信号；在发送该重置信号之后或者同时，向该第一发射机发送确认信号，该确认信号用于指示该第一发射机通过该第二光路向该第二接收机发送光信号。
结合第三方面，在第三方面的第一种可能的实现方式中，该控制器具体用于在确定该第二光路空闲的情况下，建立该第二光路。
结合第三方面或第三方面的第一种可能的实现方式，在第三方面的第二种可能的实现方式中，该控制器具体用于，根据该请求信号，向该第二接收机的限幅放大器LA的重置端口发送该重置信号。
结合第三方面的第二种可能的实现方式，在第三方面的第三种可能的实现方式中，该控制器具体用于，根据该请求信号，向该第二接收机的跨阻放大器TIA的重置端口和/或时钟数据恢复CDR的重置端口发送该重置信号。
结合第三方面或第三方面的第一种可能的实现方式，在第三方面的第四种可能的实现方式中，该控制器具体用于，根据该请求信号，向该第二接收机的重置信号生成器发送该重置信号。
结合第三方面及其上述实现方式，在第三方面的第五种实现方式中，该控制器还用于，根据该请求信号，通过控制该光交换网络中的光开关，断开该第一光路。
结合第三方面及其上述实现方式，在第三方面的第六种实现方式中，该至少一个发射机为突发发射机，该至少两个接收机为使用直流耦合的突发接收机。
基于上述技术方案，在本发明实施例中，光交换网络的控制器根据发射机发送的向接收机发送光信号的请求信号，向该接收机发送用于指示其重置为初始状态的重置信号，并在该重置信号之后或者同时向发射机发送用于指示向接收机发送光信号的确认信号，能够实现及时向第二接收机发送该重置信号，使得该接收机在接收到该发射机发送的光信号之前已经重置为初始状态，能够有效缩短该接收机对接收新的光信号的响应时间，从而能够提高光交换网络的利用率。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1示出了本发明实施例的场景示意图。
图2示出了根据本发明实施例提供的信号传输方法的示意性流程图。
图3示出了根据本发明实施例提供的信号传输方法的另一示意性流程图。
图4示出了本发明实施例涉及的接收机的示意性框图。
图5示出了根据本发明实施例提供的信号传输方法的再一示意性流程图。
图6示出了根据本发明实施例提供的信号传输方法的再一示意性流程图。
图7示出了根据本发明实施例提供的控制器的示意性框图。
图8示出了根据本发明实施例提供的控制器的另一示意性框图。
图9示出了根据本发明实施例提供的信号传输系统的示意性框图。
图10示出了根据本发明实施例提供的信号传输系统的另一示意性框图。
图11示出了根据本发明实施例提供的信号传输系统的再一示意性框图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是 全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
应理解，本发明实施例的技术方案可以应用于片上光网络(Network-on-chip)系统和光交换网络(Optical Switch Network)系统，还可应用于以下各种通信系统，例如：波分复用(Wavelength Division Multiplexing,WDM)系统，模分复用(Mode Division Multiplexing,MDM)系统，频分复用(Frequency Division Multiplexing,FDM)系统，时分复用(Time Division Multiplexing,TDM)系统和少模光纤(Few mode fiber，FMF)通信系统等。
如图1所示，假设在光交换网络的当前状态下，在该光交换网络中，建立有连接发射机Tx1与接收机Rx1的光路1，以及建立有连接发射机Tx4与接收机Rx4的光路2，例如发射机Tx1通过光路1向接收机Rx1发送突发包，发射机Tx4通过光路2向接收机Rx4发送突发包；在下一时刻，发射机Tx4改为向接收机Rx1发送突发包，则在光交换网络中建立发射机Tx4与接收机Rx1之间的光路3，发射机Tx4通过该光路3向接收机Rx1发送突发包，但在此之前，接收机Rx1处于接收发射机Tx1发送的突发包的状态，所以该接收机Rx1的参数设置仍然是针对接收Tx1发出的突发包的。应理解，该接收机Rx1只有重置为初始状态才能够实现有效接收新的信号(即Tx4发送的突发包)，具体地，当该接收机Rx1重置为初始状态后，会根据接收到的Tx4发送的信号，通过不断调整参数设置该修改Rx1的状态，最终修改为处于接收Tx4发送的信号的状态，这时就能够有效接收到Tx4发送的信号了。在当前技术中，通常是通过在接收机Rx1中增加检测模块，当该检测模块检测到新的信号(不同于Rx1之前接收的信号)时，才会触发该接收机Rx1的重置为初始状态的动作，也就是说，当前技术中，直到Tx4发出的光信号到达该接收机Rx1之后，才会触发Rx1的重置动作，因此，该接收机Rx1从结束接收Tx1的突发包开始，直到有效接收到Tx4发送的突发包，需要经历较长时间(下文中将该段时间称之为接收新的信号的响应时间)，在这段时间内，Tx4到Rx1不能发送有效数据，需要的时间越长，光交换网络的利用率越低。
本发明针对上述问题，提出一种基于光交换网络的信号传输方法、控制器和系统。
图2示出了本发明实施例的信号传输方法100的示意性流程图，该方法应用于光传输系统，该光传输系统包括光交换网络以及用于对该光交换网络进行控制的控制器，其中，在该光交换网络中存在连接第一发射机与第一接收机的第一光路，该方法100例如由光交换网络的控制器执行，该方法100包括：
S110，该控制器接收该第一发射机发送的请求信号，该请求信号用于请求向第二接收机发送光信号；
具体地，例如该第一发射机为如图1中所示的Tx4，该第一接收机为图1所示的Rx4，该第二接收机为图1中所示的Rx1，该第一光路例如为图1中所示的光交换网络中连接发射机Tx4与接收机Rx4的光路2。
应理解，该光交换网络中连接该第一发射机(Tx4)与第二接收机(Rx1)的光路(如图1中所示的光路3)还未接通，例如光路3中的光开关没有全部闭合，所以当第一发射机(Tx4)需要向第二接收机(Rx1)发送光信号时，向控制器发送请求信号，用于请求建立该第一发射机(Tx4)与第二接收机(Rx1)的光路，以向该第二接收机发送光信号。
S120，该控制器根据该请求信号，通过控制该光交换网络中的光开关，在该光交换网络中建立连接该第一发射机与该第二接收机的第二光路；
应理解，光交换网络通常包括多个具有两个入口和两个出口的2*2光开关，通过在光开关上施加电压、电流或者热信号等信号，可以更改光开关中的两个入口与对应出口的配置关系。例如，一个2*2光开关的两个入口分别是input1和input2，两个出口分别是output1和output2，假设这两入口与对两出口的原始配置关系为，从input1进入光开关的光信号从output1出，同时从input2进入光开关的光信号从output2出，假设在某一时刻，例如通过在该光开关上施加电压信号，使得两入口与两出口的配置关系改变为：从input1进入光开关的光信号更改为从output2出，同时从input2进入光开关的光信号更改为从output1出。
还应理解，在光交换网络中，通过在某一时刻控制一个、多个或者全部的光开关的状态，就可以改变光交换网络的从入口进入的光信号到出口的光路。还应理解，光交换网络的入口连接发射机，出口连接接收机，通过改变光交换网络的入口到出口的光路，从而也改变了从发射机到接收机的光路。
具体地，在本发明实施例中，例如基于上述原理，通过控制该光交换网 络的光开关，可以在光交换网络中建立连接该第一发射机(Tx4)与第二接收机(Rx4)的第二光路(如图1中所示的光路3)。
S130，该控制器根据该请求信号向该第二接收机发送用于指示该第二接收机重置为初始状态的重置信号；
具体地，控制器通过向第二接收机发送该重置信号，用于指示该第二接收机重置为初始状态。应理解，接收机在初始状态下，能够根据接收到的新的光信号，不断调整参数设置，最终确定针对新的光信号的参数配置，进而能够有效接收新的光信号。
S140，该控制器在发送该重置信号之后或者同时，向该第一发射机发送确认信号，该确认信号用于指示该第一发射机通过该第二光路向该第二接收机发送光信号。
因此，在本发明实施例中，控制器根据第一发射机发送的用于请求向第二接收机发送光信号的请求信号，通过控制光交换网络中的光开光，在光交换网络中建立连接该第一发射机与第二接收机的第二光路，并根据该请求信号，向该第二接收机发送用于指示其重置为初始状态的重置信号，在发送该重置信号的同时或者之后向该第一发射机发送用于指示其通过第二光路向第二接收机发送光信号的确认信号，能够实现及时向第二接收机发送该重置信号，从而使得该第二接收机在接收到第一发射机发送的光信号之前完成重置，能够有效缩短该第二接收机对接收新的光信号的响应时间，进而提高光交换网络的利用率。
应理解，在本发明实施例中，发射机向接收机发送的光信号可称之为突发包(Burst)。
还应理解，在本发明实施例中，该第一发射机在发送该请求信号之前，可以是处于向第一接收机发送光信号的状态，也可以是处于不向任何接收机发送光信号的状态，本发明实施例对此不作限定。
还应理解，在本发明实施例中，S120与S130没有严格先后顺序关系，例如该控制器接收到第一发射机发送的请求信号后，可以先向第二接收机发送该重置信号，然后通过控制光开关，在该光交换网络中建立连接该第一发射机与该第二接收机的第二光路；也可以根据该请求信号，先建立该第二光路，再向第二接收机发送该重置信号，本发明实施例对此不作限定。
需要说明的是，S140是在S120之后执行，即控制器在确定建立了第一 发射机与第二接收机之间的第二光路的情况下，给该第一发射机发送确认信号，以指示该第一发射机向该第二接收机通过该第二光路发送光信号。
还应理解，光交换网络中包括的光开光可以有多种不同的类型，由不同类型的光开关组成的光交换网络，其建立光路的方式也可能不同，上文在S120中的描述只作为示例而非限定。优选地，本发明实施例中涉及的光交换网络可以是由电光效应驱动的硅光开关、铌酸理开关等切换速度小于1微秒的光开关组成的光网络。
可选地，在本发明实施例中，S120该控制器根据该请求信号，通过控制该光交换网络中的光开关，在该光交换网络中建立连接该第一发射机与该第二接收机的第二光路，包括：
S121，该控制器在确定该第二光路空闲的情况下，通过控制该光交换网络中的光开关，在该光交换网络中建立连接该第一发射机与该第二接收机的第二光路。
具体地，该控制器接收到第一发射机发送的用于请求向第二接收机发送光信号的请求后，首先判断该光交换网络中连接该第一发射机与第二接收机的第二光路是否被占用，或者说，该第二光路是否与光交换网络中的其他光路存在冲突。在确认该第二光路没被占用的情况下，通过控制光交换网络中的光开关，在光交换网络中建立连接该第二光路。
应理解，在控制器接收到第一发射机的请求信号之前，光交换网络中连接第一发射机与第二接收机的第二光路不一定是通路，例如该第二光路上的光开关有的可能是断开的，即该第二光路无法传输光信号。控制器根据该请求信号，通过控制光交换网络中的光开关，使得该第二光路成为通路，此时，才可称之为建立了该第二光路，该第一发射机与第二接收机可以通过该第二光路传输光信号。
在本发明实施例中，该控制器通过控制该光交换网络中的光开关，在该光交换网络中建立该第二光路，具体地，该控制器可以直接控制该光开关，也可间接控制该光开光，例如，可以是向光交换网络发送控制信号，该控制信号用于控制光开关，以建立该第二光路；也可以是向光交换网络发送触发信号，该触发信号用于触发光交换网络的控制模块去控制光开关，以建立该第二光路。
应理解，在本发明实施例中，该控制器根据该请求信号，通过控制该光 交换网络中的光开关，在该光交换网络中建立该第二光路，具体地，可以向光交换网络发送控制信号，用于建立该第二光路。
可选地，在本发明实施例中，S120该控制器根据该请求信号，通过控制该光交换网络中的光开关，在该光交换网络中建立连接该第一发射机与该第二接收机的第二光路，包括：
该控制器根据该请求信号，向该光交换网络发送控制信号，该控制信号用于控制该光交换网络的光开关，以在该光交换网络中建立连接该第一发射机与该第二接收机的第二光路。
具体地，该控制器向光交换网络发送的控制信号可以直接用于控制光开关，例如调整光开关的入口与出口之间的配置关系，以建立该第二光路。该控制器向光交换网络发送的控制信号也可以作为用于触发对光交换网络中光开光进行控制的触发信号，例如，光交换网络包括控制电路，该控制电路接收到控制器发送的控制信号，对相应的光开关进行控制，以建立该第二光路。
可选地，在本发明实施例中，该控制器是在确认连接第一发射机与第二接收机的第二光路空闲的情况下，向该第二接收机发送用于指示其重置为初始状态的重置信号的。
在本发明实施例中，是由控制器向第二接收机发送用于指示其重置为初始状态的重置信号，且该控制器根据第一发射机发送的请求信号来发送该重置信号，从而能够保证该重置信号的准确性。此外，本发明实施例利用光交换网络存在控制器的优势，由该控制器来提供第二接收机所需的重置信号，合理充分地利用了现成设备，相比于现有技术中在接收机内部额外增加信号检测模块来触发重置信号，本发明实施例有效降低了设备成本。
可选地，在本发明实施例中，该方法100还包括：
S150，该控制器根据该请求信号，通过控制该光交换网络中的光开关，断开该第一光路。
具体地，控制器在光交换网络中建立起连接第一发射机与第二发射机之间的第二光路之后或者同时，可以断开该第一发射机与第一接收机之间的第一光路，例如将该第一光路上的光开关断开。
图3示出了根据本发明实施例提供的信号传输方法的另一示意性流程图。在S21中，光交换网络的控制器等待来自发射机的请求信号；在S22中， 该控制器接收该第一发射机的用于请求向第二接收机发送光信号的请求信号，此时，该光交换网络中建立有连接该第一发射机与第一接收机的第一光路；在S23中，该控制判断光交换网络中连接该第一发射机与第二接收机的第二光路是否空闲，如果空闲则转到S24、S25和S26，如果确定该第二光路不空闲，例如与光交换网络中的其他光路存在冲突，则转到S21中；在S24中，该控制器向第二接收机发送用于指示其重置为初始状态的重置信号；在S25中，该控制器通过控制光交换网络中的光开关，在光交换网络中建立该第二光路；在S26中，该控制器向该第一发射机发送用于指示通过第二光路向第二接收机发送光信号的确认信号；在S27中，第二接收机根据重置信号，重置为初始状态；在S28中，第一发射机根据确认信号通过第二光路向第二接收机发送光信号。
在本发明实施例中，对S24和S25先后顺序没有限制，但是S26是在S24和S25之后执行。
还应理解，在确定完成第一发射机与第二接收机之间的光信号传输之后，控制器恢复到等待发射机端的请求信号的状态，即S28之后转到S21。
图4示出了本发明实施例中的接收机的示意性框图，如图3所示，该接收机包括：
光探测器(Photo Detector，简称为“PD”)，用于接收光信号并转成光电流，具体地，该光探测器具体地为光电二极管；
跨阻放大器(Tran Impedance Amplifier，简称为“TIA”)，用于将PD输出的电流转成电压信号并输出电压信号，该跨阻放大器TIA，具体地为前置放大器；
限幅放大器(Limited Amplifier，简称为“LA”)，用于将TIA输出的电压信号放大到具有均匀输出电平的电压信号；
时钟数据恢复(Clock and Data Recovery，简称为“CDR”)，用于恢复时钟并恢复数据。
接收机接收光信号的主要过程为：第一步，将接收到的光信号转成电信号(对应于PD的功能)；第二步，将该电信号放大到标准的信号电平(对应于TIA和LA的功能)，此外，需要恢复信号的时钟(对应于CDR的功能)。
接收机在第二步将电信号放大到标准电平的信号的过程包括第一级放大(通常由TIA完成)和第二级放大(通常由LA完成)。其中，第一级放 大是选择不同的放大倍率放大信号，例如TIA有三档(或者更多档或者更少档)放大倍率：高倍率、中倍率和小倍率。根据放大倍率从大到小的顺序依次放大信号，例如首先采用高倍率放大信号，如果放大后的信号超出阈值，则将放大倍率调到中倍率，以此类推，直到放大的信号没有超出阈值。第二级放大是通过检测信号的最大值和最小值来不断反馈放大倍率，通常LA会记录下当前检测信号的最大值和最小值。
结合图1所示的场景，假设Rx1在接收到Tx4发送的信号(即为信号2)之前，处于接收Tx1发送的信号(信号1)的状态，因此Rx1的TIA、LA以及CDR的参数设置都是针对信号1的，例如Rx1的TIA的放大倍率设置在了中倍率的档上(假设Rx1的TIA的放大倍率包括高倍率、中倍率、小倍率三档)、且Rx1的LA保存了信号1的最大值和最小值，Rx1的CDR恢复的是信号1的时钟。此时，如果Rx1接收到Tx4发送的信号2，无法成功地对该信号2进行上述第二步的操作，即无法有效接收该信号2。必须对Rx1进行重置，使其恢复到初始化状态，即将Rx1的TIA的放大倍率重置为高倍率、清除Rx1的LA中的历史记录、以及初始化Rx1的CDR，才可以实现对新的信号(例如该例子中的信号2)的有效接收。
因此，在接收机需要接收新的信号时，需要将其接收机重置为初始状态，具体地，需要重置该接收机的LA，即清空LA的历史记录；需要重置该接收机的TIA，即将其放大倍率重置到放大倍率档位的最高档位；此外，还需要初始化该接收机的CDR。
应理解，对接收机的重置包括对该接收机的限幅放大器LA的重置，或者还包括对跨阻放大器TIA或时钟数据恢复CDR的重置。具体地，在本发明实施例中，该控制器可以与接收机的限幅放大器LA的重置端口连接，实现将该重置信号发送到接收机的限幅放大器LA的重置端口，来实现对该接收机的重置；该控制器还可以与跨阻放大器TIA的重置端口以及时钟数据恢复CDR的重置端口连接，实现将该重置信号直接发送到该接收机的跨阻放大器TIA的重置端口以及时钟数据恢复CDR的重置端口，来实现对该接收机的重置；或者该控制器可以与该接收机的重置信号生成器连接，通过该接收机的重置信号生成器将重置信号输入到跨阻放大器TIA的重置端口、限幅放大器LA的重置端口、和时钟数据恢复CDR的重置端口，本发明实施例对此不作限定。
可选地，在本发明实施例中，S130该控制器根据该请求信号向该第二接收机发送用于指示该第二接收机重置为初始状态的重置信号，包括：
S131，该控制器根据该请求信号，向该第二接收机的限幅放大器LA的重置端口发送该重置信号。
具体地，该控制器与该第二接收机的限幅放大器LA的重置端口连接，以向其发送该重置信号。
可选地，在本发明实施例中，S130该控制器根据该请求信号向该第二接收机发送用于指示该第二接收机重置为初始状态的重置信号，包括：
S132，该控制器根据该请求信号，向该第二接收机的跨阻放大器TIA的重置端口和/或时钟数据恢复CDR的重置端口发送该重置信号。
具体地，该控制器与该第二接收机的跨阻放大器TIA的重置端口和/或时钟数据恢复CDR的重置端口连接，以向其发送该重置信号。
可选地，在本发明实施例中，S130该控制器根据该请求信号向该第二接收机发送用于指示该第二接收机重置为初始状态的重置信号，包括：
S133，该控制器根据该请求信号，向该第二接收机的重置信号生成器发送该重置信号。
具体地，该控制器与该第二接收机的重置信号生成器连接，通过该重置信号生成器向该第二接收机发送该重置信号。
因此，在本发明实施例中，控制器根据发射机发送的请求信号向第二接收机发送重置信号，并在该重置信号之后或者同时，向该发射机发送确认信号，从而使得该第二接收机在接收到该发射机发送的光信号时，已经重置为初始状态，能够有效缩短第二接收机接收不同发射机发送的信号的间隔时间，即缩短对接收新的信号的响应时间，进而提高光交换网络的利用率。同时，该重置信号是光交换网络的控制器生成并发送到接收机，保证了该重置信号的可靠性。此外，在本发明实施例中，利用光交换网络自身存在的控制器向第二接收机发送重置信号，不需要第二接收机作额外的检测，就能够实现及时重置为初始状态，设备成本低。
可选地，在本发明实施例中，该第二接收机为直流耦合突发接收机。
应理解，突发接收机相对于普通接收机，当需要相继接收来自不同发射机的光信号时，直流耦合突发接收机可以在较短的时间内完成信号的接收，主要体现在TIA和LA可以更快的放大信号，CDR可以更快的恢复时钟。
还应理解，直流耦合的突发接收机是相对于交流耦合突发接收机而言的，在直流耦合的突发接收机的TIA和LA之间没有电容连接(如图4所示)，当接收来自不同发射机发射的信号时，直流耦合的突发接收机不会滤掉信号的直流部分，因此处理信号的速度较快。
因此，在本发明实施例中，控制器根据第一发射机发送的用于请求向第二接收机发送光信号的请求信号，通过控制光交换网络中的光开光，在光交换网络中建立连接该第一发射机与第二接收机的第二光路，并根据该请求信号，向该第二接收机发送用于指示其重置为初始状态的重置信号，在发送该重置信号的同时或者之后向该第一发射机发送用于指示其通过第二光路向第二接收机发送光信号的确认信号，从而使得该第二接收机在接收到第一发射机发送的光信号之前重置为初始状态，能够有效缩短该第二接收机对接收新的光信号的响应时间，进而提高光交换网络的利用率。
应理解，在本发明的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本发明实施例的实施过程构成任何限定。
上文从控制器的角度描述了根据本发明实施例提供的方法，下面分别从发射机和接收机的角度描述根据本发明实施例提供的方法。
图5示出了根据本发明实施例提供的信号传输方法200的示意性流程图，该方法应用于光传输系统，该光传输系统包括光交换网络以及用于对该光交换网络进行控制的控制器，其中，在该光交换网络中存在连接第一发射机与第一接收机的第一光路，该方法例如可以由第一发射机来执行，如图5所示，该方法200包括：
S210，第一发射机向该控制器发送请求信号，该请求用于请求向第二接收机发送光信号；
S220，第一发射机接收该控制器发送的用于指示通过第二光路向该第二接收机发送光信号的确认消息，该确认信号是该控制器在向该第二接收机发送用于指示其重置为初始状态的重置信号之后或者同时发送的，该第二光路为光交换网络中连接该第一发射机与第二接收机的光路；
S230，第一发射机通过光交换网络中的第二光路，向该第二接收机发送光信号。
具体描述请参见上文在方法100中的描述，为了简洁，这里不再赘述。
具体地，第一发射机在接收到控制器发送的确认信号后，即表明光交换网络中已经建立好了该发射机与该第二接收机之间的第二光路了，所以，该发射机通过该第二光路，向该第二接收机发送信号。由于，该控制器是在向第二接收机发送重置信号之后或同时向第一发射机发送确认信号，因此，该第一发射机发送的信号在到达第二接收机之前，该第二接收机已经重置为能够有效接收该第一发射机发送的信号的初始状态了，因此，能够有效提高信号传输效率。
可选地，在本发明实施例中，该方法200还包括：
S240，第一发射机在未接收到该确认信号的情况下，继续向该控制器发送该请求信号。
应理解，在本发明的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本发明实施例的实施过程构成任何限定。
下面从接收机的角度描述根据本发明实施例提供的信号传输方法。
图6示出了根据本发明实施例提供的基于光交换网络的信号传输方法300的示意性流程图，该方法应用于光传输系统，该光传输系统包括光交换网络以及用于对该光交换网络进行控制的控制器，其中，在该光交换网络中存在连接第一发射机与第一接收机的第一光路，该方法例如可以由第二接收机来执行，该方法300包括：
S310，第二接收机接收该控制器发送的用于指示该第二接收机重置为初始状态的重置信号，该重置信号是该控制器根据第一发射机发送的用于请求向该第二接收机发送光信号的请求信号发送的，该控制器在发送该重置信号之后或者同时向该第一发射机发送确认信号，该确认信号用于指示第一发射机向第二接收机发送光信号；
S320，该第二接收机根据该重置信号，重置为初始状态；
S330，该第二接收机通过第二光路接收该第一发射机发送的光信号，该第二光路为光交换网路中连接该第一发射机与第二接收机的光路。
因此，在本发明实施例中，接收机在接收到发射机发送的光信号之前，已根据控制器发送的重置信号完成重置，能够快速有效接收发射机发送的光信号，即及时完成重置为初始状态，能够有效缩短该接收机对接收新的光信号的响应时间，进而提高光交换网络的利用率。
本发明实施例中涉及的接收机如图4所示，具体如上文描述，这里不再赘述。
可选地，在本发明实施例中，S310第二接收机接收光交换网络的控制器发送的用于指示该第二接收机重置为初始状态的重置信号，包括：
该第二接收机通过限幅放大器LA的重置端口，接收该重置信号。
具体地，该控制器与该第二接收机的限幅放大器LA的重置端口连接，以向其发送该重置信号。
可选地，在本发明实施例中，S310第二接收机接收光交换网络的控制器发送的用于指示该第二接收机重置为初始状态的重置信号，包括：
该第二接收机通过跨阻放大器TIA的重置端口和/或时钟数据恢复CDR的重置端口，接收该重置信号。
具体地，该控制器与该第二接收机的跨阻放大器TIA的重置端口和/或时钟数据恢复CDR的重置端口连接，以向其发送该重置信号。
可选地，在本发明实施例中，S310第二接收机接收光交换网络的控制器发送的用于指示该第二接收机重置为初始状态的重置信号，包括：
该第二接收机通过该第二接收机的重置信号生成器接收该重置信号。
具体地，该控制器与该第二接收机的重置信号生成器连接，通过该重置信号生成器向该第二接收机发送该重置信号。
具体过程与上文在方法100中的描述一致，为了简洁，不再赘述。
因此，在本发明实施例中，接收机在接收到发射机发送的光信号之前，已根据控制器发送的重置信号完成重置，能够快速有效接收发射机发送的光信号，即及时完成重置为初始状态，能够有效缩短该接收机对接收新的光信号的响应时间，进而提高光交换网络的利用率。
应理解，在本发明的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本发明实施例的实施过程构成任何限定。
上文中结合图1至图6，详细描述了根据本发明实施例的基于光交换网络的信号传输方法，下面将结合图7和图8，描述根据本发明实施例提供的控制器。
图7示出了根据本发明实施例提供的控制器400的示意性框图，该控制器应用于光传输系统，该光传输系统包括光交换网络，该控制器用于对该光 交换网络进行控制，其中，在该光交换网络中存在连接第一发射机与第一接收机的第一光路，该控制器包括：
接收模块410，用于接收第一发射机发送的请求信号，该请求信号用于请求向第二接收机发送光信号；
光路建立模块420，用于根据该接收模块接收的该请求信号，通过控制该光交换网络中的光开关，在该光交换网络中建立连接该第一发射机与该第二接收机的第二光路；
发送模块430，用于根据该接收模块接收的该请求信号向该第二接收机发送用于指示该第二接收机重置为初始状态的重置信号；
该发送模块430还用于，在发送该重置信号之后或者同时，向该第一发射机发送确认信号，该确认信号用于指示该第一发射机通过该第二光路向该第二接收机发送光信号。
因此，在本发明实施例中，控制器根据第一发射机发送的用于请求向第二接收机发送光信号的请求信号，通过控制光交换网络中的光开光，在光交换网络中建立连接该第一发射机与第二接收机的第二光路，并根据该请求信号，向该第二接收机发送用于指示其重置为初始状态的重置信号，在发送该重置信号的同时或者之后向该第一发射机发送用于指示其通过第二光路向第二接收机发送光信号的确认信号，能够实现及时向第二接收机发送该重置信号，从而使得该第二接收机在接收到第一发射机发送的光信号之前重置为初始状态，能够有效缩短该第二接收机对接收新的光信号的响应时间，进而提高光交换网络的利用率。
可选地，在本发明实施例中，该光路建立模块具体用于，在确定该第二光路空闲的情况下，建立该第二光路。
应理解，本发明实施例中涉及的接收机如图4所示，具体如上文描述，这里不再赘述。
可选地，在本发明实施例中，该发送模块具体用于，根据该请求信号，向该第二接收机的限幅放大器LA的重置端口发送该重置信号。
具体地，该控制器与该第二接收机的限幅放大器LA的重置端口连接，以向其发送该重置信号。
可选地，在本发明实施例中，该发送模块具体用于，根据该请求信号，向该第二接收机的跨阻放大器TIA的重置端口和/或时钟数据恢复CDR的重 置端口发送该重置信号。
具体地，该控制器与该第二接收机的跨阻放大器TIA的重置端口和/或时钟数据恢复CDR的重置端口连接，以向其发送该重置信号。
可选地，在本发明实施例中，该发送模块具体用于，根据该请求信号，向该第二接收机的重置信号生成器发送该重置信号。
具体地，该控制器与该第二接收机的重置信号生成器连接，通过该重置信号生成器向该第二接收机发送该重置信号。
可选地，在本发明实施例中，该控制器还包括：
光路断开模块，用于根据该请求信号，通过控制该光交换网络中的光开关，断开该第一光路。
可选地，在本发明实施例中，该第二接收机为使用直流耦合的突发接收机。
因此，在本发明实施例中，控制器根据第一发射机发送的用于请求向第二接收机发送光信号的请求信号，通过控制光交换网络中的光开光，在光交换网络中建立连接该第一发射机与第二接收机的第二光路，并根据该请求信号，向该第二接收机发送用于指示其重置为初始状态的重置信号，在发送该重置信号的同时或者之后向该第一发射机发送用于指示其通过第二光路向第二接收机发送光信号的确认信号，能够实现及时向第二接收机发送该重置信号，从而使得该第二接收机在接收到第一发射机发送的光信号之前重置为初始状态，能够有效缩短该第二接收机对接收新的光信号的响应时间，进而提高光交换网络的利用率。
应理解，根据本发明实施例的基于光交换网络的信号传输控制器400可对应于本发明实施例的信号传输方法中的光交换网络的控制器，并且控制器500中的各个模块的上述和其它操作和/或功能分别为了实现图1至图6中的各个方法的相应流程，为了简洁，在此不再赘述。
如图8所示，本发明实施例还提供了一种控制器500，该控制器500应用于光传输系统，该光传输系统包括光交换网络，该控制器用于对该光交换网络进行控制，其中，在该光交换网络中存在连接第一发射机与第一接收机的第一光路，该控制器500包括处理器510、存储器520、总线系统530、接收器540和发送器550。其中，处理器510、存储器520、接收器540和发送器550通过总线系统530相连，该存储器520用于存储指令，该处理器510 用于执行该存储器520存储的指令，以控制接收器540接收信号，并控制发送器550发送信号。其中，该接收器540用于，接收该第一发射机发送的请求信号，该请求信号用于请求向第二接收机发送光信号；该处理器510用于，根据该请求信号，通过控制该光交换网络中的光开关，在该光交换网络中建立连接该第一发射机与该第二接收机的第二光路；该发送器550用于，根据该请求信号向该第二接收机发送用于指示该第二接收机重置为初始状态的重置信号；在发送该重置信号之后或者同时，向该第一发射机发送确认信号，该确认信号用于指示该第一发射机通过该第二光路向该第二接收机发送光信号。
因此，在本发明实施例中，控制器根据第一发射机发送的用于请求向第二接收机发送光信号的请求信号，通过控制光交换网络中的光开光，在光交换网络中建立连接该第一发射机与第二接收机的第二光路，并根据该请求信号，向该第二接收机发送用于指示其重置为初始状态的重置信号，在发送该重置信号的同时或者之后向该第一发射机发送用于指示其通过第二光路向第二接收机发送光信号的确认信号，能够实现及时向第二接收机发送该重置信号，从而使得该第二接收机在接收到第一发射机发送的光信号之前重置为初始状态，能够有效缩短该第二接收机对接收新的光信号的响应时间，进而提高光交换网络的利用率。可选地，在本发明实施例中，处理器510具体用于，在确定该第二光路空闲的情况下，建立该第二光路。
应理解，本发明实施例中涉及的接收机如图4所示，具体如上文描述，这里不再赘述。
可选地，在本发明实施例中，发送器550具体用于，根据该请求信号，向该第二接收机的限幅放大器LA的重置端口发送该重置信号。
具体地，该发送器550与该第二接收机的限幅放大器LA的重置端口连接。
可选地，在本发明实施例中，发送器550具体用于，根据该请求信号，向该第二接收机的跨阻放大器TIA的重置端口和/或时钟数据恢复CDR的重置端口发送该重置信号。
具体地，该发送器550与该第二接收机的跨阻放大器TIA的重置端口和/或时钟数据恢复CDR的重置端口连接。
可选地，在本发明实施例中，发送器550具体用于，根据该请求信号， 向该第二接收机的重置信号生成器发送该重置信号。
具体地，该发送器550与该第二接收机的重置信号生成器连接。
可选地，在本发明实施例中，处理器510具体用于，根据该请求信号，通过控制该光交换网络中的光开关，断开该第一光路。
可选地，在本发明实施例中，该第二接收机为使用直流耦合的突发接收机。
应理解，在本发明实施例中，该处理器510可以是中央处理单元(Central Processing Unit，简称为“CPU”)，该处理器510还可以是其他通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现成可编程门阵列(FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
该存储器520可以包括只读存储器和随机存取存储器，并向处理器510提供指令和数据。存储器520的一部分还可以包括非易失性随机存取存储器。例如，存储器520还可以存储设备类型的信息。
该总线系统530除包括数据总线之外，还可以包括电源总线、控制总线和状态信号总线等。但是为了清楚说明起见，在图中将各种总线都标为总线系统530。
在实现过程中，上述方法的各步骤可以通过处理器510中的硬件的集成逻辑电路或者软件形式的指令完成。结合本发明实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器520，处理器510读取存储器520中的信息，结合其硬件完成上述方法的步骤。为避免重复，这里不再详细描述。
因此，在本发明实施例中，控制器根据第一发射机发送的用于请求向第二接收机发送光信号的请求信号，通过控制光交换网络中的光开光，在光交换网络中建立连接该第一发射机与第二接收机的第二光路，并根据该请求信号，向该第二接收机发送用于指示其重置为初始状态的重置信号，在发送该重置信号的同时或者之后向该第一发射机发送用于指示其通过第二光路向第二接收机发送光信号的确认信号，能够实现及时向第二接收机发送该重置信号，从而使得该第二接收机在接收到第一发射机发送的光信号之前重置为 初始状态，能够有效缩短该第二接收机对接收新的光信号的响应时间，进而提高光交换网络的利用率。
应理解，根据本发明实施例的控制器500可对应于本发明实施例的信号传输方法中的光交换网络的控制器，以及可以对应于根据本发明实施例的控制器400，并且控制器500中的各个模块的上述和其它操作和/或功能分别为了实现图1至图6中的各个方法的相应流程，为了简洁，在此不再赘述。
如图9所示，本发明实施例还提出一种基于光交换网络的信号传输系统600，该系统600包括：
光交换网络610，在该光交换网络中存在连接第一发射机630与第一接收机640的第一光路；
控制器620，用于对该光交换网络610进行控制，该控制器620具体用于，接收该第一发射机630发送的请求信号，该请求信号用于请求向第二接收机650发送光信号；根据该请求信号，通过控制该光交换网络610中的光开关，在该光交换网路610中建立连接该第一发射机630与该第二接收机650的第二光路；根据该请求信号向该第二接收机650发送用于指示该第二接收机650重置为初始状态的重置信号；在发送该重置信号之后或者同时，向该第一发射机630发送确认信号，该确认信号用于指示该第一发射机630通过该第二光路向该第二接收机650发送光信号。
因此，在本发明实施例中，控制器根据第一发射机发送的用于请求向第二接收机发送光信号的请求信号，通过控制光交换网络中的光开光，在光交换网络中建立连接该第一发射机与第二接收机的第二光路，并根据该请求信号，向该第二接收机发送用于指示其重置为初始状态的重置信号，在发送该重置信号的同时或者之后向该第一发射机发送用于指示其通过第二光路向第二接收机发送光信号的确认信号，能够实现及时向第二接收机发送该重置信号，从而使得该第二接收机在接收到第一发射机发送的光信号之前重置为初始状态，能够有效缩短该第二接收机对接收新的光信号的响应时间，进而提高光交换网络的利用率。
应理解，该第一发射机620用于，向该控制器610发送用于向该第二接收机640发送光信号的请求信号；根据控制器620发送的确认信号，通过该第二光路向该第二接收机640发送光信号；
该第二接收机620用于，根据该重置信号，重置为初始状态；通过该第 二光路接收该第一发射机620发送的该光信号。
应理解，本发明实施例中涉及的接收机如图4所示，具体如上文描述，这里不再赘述。
可选地，在本发明实施例中，该控制器具体用于在确定该第二光路空闲的情况下，建立该第二光路。
可选地，在本发明实施例中，该控制器具体用于，根据该请求信号，向该第二接收机的限幅放大器LA的重置端口发送该重置信号。
具体地，该控制器与该第二接收机的限幅放大器LA的重置端口连接，以向其发送该重置信号。
可选地，在本发明实施例中，该控制器具体用于，根据该请求信号，向该第二接收机的跨阻放大器TIA的重置端口和/或时钟数据恢复CDR的重置端口发送该重置信号。
具体地，该控制器与该第二接收机的跨阻放大器TIA的重置端口和/或时钟数据恢复CDR的重置端口连接，以向其发送该重置信号。
可选地，在本发明实施例中，该控制器具体用于，根据该请求信号，向该第二接收机的重置信号生成器发送该重置信号。
具体地，该控制器与该第二接收机的重置信号生成器连接，通过该重置信号生成器向该第二接收机发送该重置信号。
可选地，在本发明实施例中，该控制器还用于，根据该请求信号，通过控制该光交换网络中的光开关，断开该第一光路。
可选地，在本发明实施例中，该至少一个发射机为突发发射机，该至少两个接收机为使用直流耦合的突发接收机。
因此，在本发明实施例中，控制器根据第一发射机发送的用于请求向第二接收机发送光信号的请求信号，通过控制光交换网络中的光开光，在光交换网络中建立连接该第一发射机与第二接收机的第二光路，并根据该请求信号，向该第二接收机发送用于指示其重置为初始状态的重置信号，在发送该重置信号的同时或者之后向该第一发射机发送用于指示其通过第二光路向第二接收机发送光信号的确认信号，能够实现及时向第二接收机发送该重置信号，从而使得该第二接收机在接收到第一发射机发送的光信号之前重置为初始状态，能够有效缩短该第二接收机对接收新的光信号的响应时间，进而提高光交换网络的利用率。
应理解，根据本发明实施例的基于光交换网络的信号传输系统600中的控制器610可对应于本发明实施例的信号传输方法中的光交换网络的控制器，以及可以对应于根据本发明实施例的控制器400和500，系统600中的第一发射机620可对应于本发明实施例的信号传输方法中的第一发射机，系统600中的第二接收机640可对应于本发明实施例的信号传输方法中的第二接收机。并且信号传输系统600中的各个模块的上述和其它操作和/或功能分别为了实现图1至图6中的各个方法的相应流程，为了简洁，在此不再赘述。
图10示出了根据本发明实施例提供的基于光交换网络的信号传输系统700，该系统700包括：
光交换网络710、控制器720、至少一个发射机730(图10中示出包括4个发射机Tx1至Tx4)和至少一个接收机740(图10中示出包括4个接收机Rx1至Rx4)，其中，发射机730和接收机740通过光路(光纤或者光波导)与光交换网络710连接，发射机730和接收机740通过电路或者光路与控制器720连接，控制器720通过电路与光交换网络710连接。
具体地，如图11所示，假设在时刻t1，Tx4向RX4发送信号，Tx1向Rx1发送信号，在时刻t2，Tx4需要与Rx1通信，Tx4发送请求信号到控制器720，控制器720接收到请求信号后，确认Tx4到Rx1的光路没有被占据，控制器720发送控制信号到光交换网络，配置Tx4到Rx1的光路，同时向Rx1发送重置信号，指示Rx1重置为初始状态；在发送重置信号之后或者同时，回复确认信号到Tx4(与Tx4发送请求信号使用同一条线路，图11中画出两条线是为了更易理解)。Tx4收到确认信号之后发送光突发包到Rx1，完成一次突发传输。
应理解，图10中的光交换网络710对应于图6中的光交换网络610，图10中的控制器720对应于图9中的控制器620，图10中的至少一个发射机730包括图9中的第一发射机630，图10中的至少一个接收机740包括图9中的第一接收机640和第二接收机650。
因此，在本发明实施例中，控制器根据第一发射机发送的用于请求向第二接收机发送光信号的请求信号，通过控制光交换网络中的光开光，在光交换网络中建立连接该第一发射机与第二接收机的第二光路，并根据该请求信号，向该第二接收机发送用于指示其重置为初始状态的重置信号，在发送该重置信号的同时或者之后向该第一发射机发送用于指示其通过第二光路向 第二接收机发送光信号的确认信号，能够实现及时向第二接收机发送该重置信号，从而使得该第二接收机在接收到第一发射机发送的光信号之前重置为初始状态，能够有效缩短该第二接收机对接收新的光信号的响应时间，进而提高光交换网络的利用率。
还应理解，本文中涉及的第一、第二以及各种数字编号仅为描述方便进行的区分，并不用来限制本发明实施例的范围。
应理解，在本发明的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本发明实施例的实施过程构成任何限定。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。

Claims (6)

  1. 一种信号传输方法，其特征在于，所述方法应用于光传输系统，所述光传输系统包括光交换网络以及用于对所述光交换网络进行控制的控制器，其中，在所述光交换网络中存在连接第一发射机与第一接收机的第一光路，所述方法包括：
    所述控制器接收所述第一发射机发送的请求信号，所述请求信号用于请求向第二接收机发送光信号；
    所述控制器根据所述请求信号，通过控制所述光交换网络中的光开关，在所述光交换网络中建立连接所述第一发射机与所述第二接收机的第二光路；
    所述控制器根据所述请求信号向所述第二接收机发送用于指示所述第二接收机重置为初始状态的重置信号；
    所述控制器在发送所述重置信号之后或者同时，向所述第一发射机发送确认信号，所述确认信号用于指示所述第一发射机通过所述第二光路向所述第二接收机发送光信号。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    所述控制器根据所述请求信号，通过控制所述光交换网络中的光开关，断开所述第一光路。
  3. 一种控制器，其特征在于，所述控制器应用于光传输系统，所述光传输系统包括光交换网络，所述控制器用于对所述光交换网络进行控制，其中，在所述光交换网络中存在连接第一发射机与第一接收机的第一光路，所述控制器包括：
    接收模块，用于接收第一发射机发送的请求信号，所述请求信号用于请求向第二接收机发送光信号；
    光路建立模块，用于根据所述接收模块接收的所述请求信号，通过控制所述光交换网络中的光开关，在所述光交换网络中建立连接所述第一发射机与所述第二接收机的第二光路；
    发送模块用于，根据所述接收模块接收的所述请求信号向所述第二接收机发送用于指示所述第二接收机重置为初始状态的重置信号；
    所述发送模块还用于，在发送所述重置信号之后或者同时，向所述第一发射机发送确认信号，所述确认信号用于指示所述第一发射机通过所述第二 光路向所述第二接收机发送光信号。
  4. 根据权利要求3所述的控制器，其特征在于，所述控制器还包括：
    光路断开模块，用于根据所述请求信号，通过控制所述光交换网络中的光开关，断开所述第一光路。
  5. 一种信号传输系统，其特征在于，所述系统包括：
    光交换网络，在所述光交换网络中存在连接第一发射机与第一接收机的第一光路；
    控制器，用于对所述光交换网络进行控制，所述控制器具体用于，接收所述第一发射机发送的请求信号，所述请求信号用于请求向第二接收机发送光信号；根据所述请求信号，通过控制所述光交换网络中的光开关，在所述光交换网路中建立连接所述第一发射机与所述第二接收机的第二光路；根据所述请求信号向所述第二接收机发送用于指示所述第二接收机重置为初始状态的重置信号；在发送所述重置信号之后或者同时，向所述第一发射机发送确认信号，所述确认信号用于指示所述第一发射机通过所述第二光路向所述第二接收机发送光信号。
  6. 根据权利要求5所述的系统，其特征在于，所述控制器还用于，根据所述请求信号，通过控制所述光交换网络中的光开关，断开所述第一光路。
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