WO2022143316A1

WO2022143316A1 - Delay measurement method and apparatus

Info

Publication number: WO2022143316A1
Application number: PCT/CN2021/140267
Authority: WO
Inventors: 黄林
Original assignee: 华为技术有限公司
Priority date: 2020-12-30
Filing date: 2021-12-22
Publication date: 2022-07-07
Also published as: CN114696896A

Abstract

Embodiments of the present application provide a delay measurement method and apparatus, for use in measuring a receiving-end delay difference between channels in a super channel system. Specifically, the delay measurement apparatus starts an optical loopback apparatus so as to form a first communication channel, wherein the first communication channel comprises a transmitting-end channel and N receiving-end channels, and N is a positive integer; the delay measurement apparatus controls the transmitting-end channel to transmit a first optical port frame, the optical port frame being used for positioning frame header position information; then the delay measurement apparatus determines, under a preset number of beats, first frame header position information of the first optical port frame in each of the N receiving-end channels, wherein a receiving local source frequency of each of the N receiving-end channels has one-to-one correspondence to a transmitting frequency of the transmitting-end channel; and finally, the delay measurement apparatus calculates a receiving-end delay difference between the N receiving-end channels according to the first frame header position information of each of the N receiving-end channels.

Description

A kind of delay measurement method and device

This application claims the priority of the Chinese patent application with the application number 202011628136.9 and the application title "A Time Delay Measurement Method and Device" filed with the State Intellectual Property Office of China on December 30, 2020, the entire contents of which are incorporated by reference in in this application.

technical field

The present application relates to the field of communications, and in particular, to a method and device for measuring delay.

Background technique

In the optical communication system, the spectrum distribution of the traditional dense wavelength division multiplexing (DWDM) system is shown in Figure 1. There are guard intervals between channels to avoid inter-carrier interference (ICI) between channels. ). The schematic diagram of the output spectrum of the current super channel optical module is shown in Figure 2. In this scheme, the super channel optical module will no longer retain the guard interval between channels, and the ICI interference will be compensated through the channel joint processing algorithm to achieve utilization. The purpose of protecting the problem spectrum resources and improving the system spectrum utilization.

Under this scheme, the joint signal processing of the super channel optical module needs to ensure that the delay difference between channels is well compensated; therefore, the super channel system needs to obtain the input ports of the digital analog converter (DAC) of each channel from the originating end in advance The inter-channel delay difference before the multiplexing module and the inter-channel delay difference from the demultiplexing module of each channel at the receiving end to the output port of the analog digital converter (ADC) of each channel. According to the block diagram of the super channel optical fiber communication system shown in Figure 3 and the schematic diagram of the channel model of the super channel system shown in Figure 4, it can be seen that the sources of the delay difference between the channels of the super channel system include static delay difference and dynamic delay difference. . Among them, the sources of static delay difference include inherent delay difference between devices between channels, radio frequency (RF) signal transmission line delay difference, optical device optical path difference, etc.; dynamic delay difference sources are mainly multi-channel ADC, DAC each time The delay difference between power-on channels varies randomly. Therefore, the super channel system needs to strictly distinguish the delay difference between channels into the delay difference of the sender and the delay of the receiver.

The current multi-channel delay difference usually refers to the delay difference of a wireless communication multiple-input multiple-output (multiple-input multiple-output, MIMO). The method for estimating the delay difference between channels in a wireless communication MIMO system is to estimate the delay difference between different channels by inserting a pilot sequence matrix into the air interface frame. Under this scheme, the wireless communication MIMO system only estimates the overall delay difference, and does not need to distinguish the delay difference between the transmitting end and the receiving end. Therefore, the channel delay difference estimation method in the wireless communication MIMO system is not suitable for the super channel system. Therefore, there is an urgent need for a method for measuring the transmitter delay difference and the receiver delay difference of each channel in the super channel system.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a method and device for measuring delay, which are used to measure the delay difference at the receiving end of each channel in a super channel system.

In a first aspect, an embodiment of the present application provides a delay measurement method. In the delay measurement method, the delay measurement device further includes adding an optical loopback device to the communication system, and the optical loopback device includes an optical coupler and an optical amplifier. And optical switch, mainly used to form a communication channel between the receiving end and the sending end. The delay measurement device controls an originating channel in the first communication channel to send a first optical port frame, wherein the first communication channel is formed by the delay measurement device by controlling the optical switch to activate the optical loopback device, and the first communication channel is formed by controlling the optical switch to activate the optical loopback device. The communication channel includes a sending channel and N receiving channels, and the value of N is a positive integer; the first optical port frame is used to locate the frame header position information, so as to determine the delay difference; then the delay measurement device is in The first frame header position information of the first optical port frame in each of the N receiving end channels is determined under a preset count beat, wherein the receiving book of each receiving end channel in the N receiving end channels is The frequency of the vibrating source corresponds to the transmission frequency of the transmitting channel one-to-one; finally, the delay measurement device calculates the time delay between the N receiving end channels according to the position information of the first frame header of each receiving end channel in the N receiving end channels. Receive delay difference.

In the optical loopback device, in order to minimize the insertion loss of the signal optical path, the optical coupler can use a coupler with a low coupling coefficient (for example, the coupling coefficient is less than -15dB). Since an optical coupler with a low coupling coefficient is used, the optical loopback device also needs to add an optical amplifier to amplify the power of the loopback optical signal. In order to realize normal operation after the delay measurement and the delay compensation are completed, the optical switch in the optical loopback device completely turns off the loopback channel after the delay measurement is completed.

In the technical solution provided by this embodiment, the delay measurement device forms a transmission-multiple-receive communication channel through the optical loopback device, transmits the optical port frame through the transmitting end channel, and the receiving end channel determines the frame header position in the process of receiving the optical port frame information, so as to determine the delay difference between each receiving end channel. In this way, the delay measuring device realizes the independent measurement of the receiving end delay difference of the receiving end channel according to the multi-channel light source cooperative tuning and digital high-precision cooperative counting, thereby satisfying the super channel system to distinguish the transmitting end delay difference and the receiving end delay difference. requirements.

Optionally, in this embodiment, after acquiring the receiving end delay difference, the delay measuring device may perform delay compensation on the receiving end channel according to the receiving end delay difference. Usually, a digital system can be used for delay compensation, such as delay compensation through a shift register. The specific method is not limited here.

Optionally, after the delay measuring device obtains the receiving end delay difference of the receiving end channel and performs delay compensation, the delay measuring device can perform corresponding delay measurement on the transmitting end channel, which specifically includes the following: possible implementations:

In a possible implementation manner, the N originating channels in the second communication channel are controlled to send the second optical port frame, the second communication channel is formed by the delay measurement device opening the optical loopback device, and the second communication channel is formed by enabling the optical loopback device by the delay measurement device. The communication channel includes N transmitting end channels and the N receiving end channels, the transmitting end frequency of each transmitting end channel in the N transmitting end channels and the receiving local oscillator light source of each receiving end channel in the N receiving end channels The frequencies are in one-to-one correspondence and are the same; the delay measurement device determines the second frame header position information of the second optical port frame in each of the N receiving end channels under a preset count beat; The delay measuring device calculates the difference in the delay between the N transmitting ends according to the position information of the second frame header of each of the N receiving channels. In this scheme, the receiving end delay difference of the receiving end channel has been compensated, so the receiving end delay difference is 0. Therefore, in this scheme, the receiving end delay difference calculated by the multi-channel light source cooperative tuning and digital high-precision cooperative counting is calculated. The delay difference between the receiving ends of the end channels is equal to the delay difference between the transmitting ends of the transmitting end channels. At the same time, in this solution, since the frequency of the transmitter is different between the channels of the transmitter, the frequency of the local oscillator light source of the receiver is also different between the channels of the receiver, so there is no interference problem. That is, this solution can be applied to multiple drop scenarios, such as colorless drop scenarios and WSS drop scenarios.

In another possible implementation manner, the delay measuring device controls the N originating channels in the third communication channel to send the third optical port frames in time-division and sequentially, and the third communication channel is enabled by the delay measuring device. The optical loopback device is formed, the third communication channel includes N transmitting end channels and one receiving end channel, the transmitting end frequency of each transmitting end channel in the N transmitting end channels and the receiving local oscillator light source frequency of the one receiving end channel are the same; the delay measuring device sequentially determines N third frame header position information of the third optical port frame in the one receiving end channel under a preset count beat; the delay measuring device determines the N third frame header position information according to the N The third frame header position information is used to calculate the originating delay difference between the N originating channels. In this scheme, there is only one receiver channel, so the receiver delay difference is already zero. The originating delay difference between the originating channels. At the same time, in this solution, since there is only one receiving channel, the receiving channel does not need to perform delay compensation, so the solution of measuring the delay difference of the transmitting end in this solution can be implemented independently. That is, this solution can be used after delay compensation is performed on the receiving channel, or it can be used when the receiving channel has not performed delay compensation.

In another possible implementation manner, the delay measuring device controls N originating channels in the fourth communication channel to send the fourth optical port frame, and the fourth communication channel is enabled by the delay measuring device to enable the optical loopback The device is formed, the fourth communication channel includes N transmitting end channels and one receiving end channel, the transmitting end frequencies of the 1 to N transmitting end channels are set to be f1 to fn in sequence, and the receiving end channel of the one receiving end channel The frequency of the local oscillator light source Set as f1 to fn; the delay measurement device determines N fourth frame header position information of the fourth optical port frame in the one receiving end channel according to the time-division frequency sweep under the preset count beat; The delay measuring apparatus calculates the difference in the transmission delay between the N transmission channels according to the position information of the N fourth frame headers. In this solution, the originating channel can simultaneously send the optical port frame according to the originating frequency configured by its own channel, or each originating channel can send the optical port frame sequentially according to the originating frequency configured by its own channel. In this scheme, there is only one receiver channel, so the receiver delay difference is already zero. The originating delay difference between the originating channels. At the same time, in this solution, since there is only one receiving channel, the receiving channel does not need to perform delay compensation, so the solution of measuring the delay difference of the transmitting end in this solution can be implemented independently. That is, this solution can be used after delay compensation is performed on the receiving channel, or it can be used when the receiving channel has not performed delay compensation.

In this embodiment, after the delay measurement device obtains the transmission delay difference, the delay compensation can be performed on the transmission channel according to the transmission delay difference. Usually, a digital system can be used to perform delay compensation, and the specific method is not limited here.

Optionally, the frame header of the optical port frame may be defined as a known sequence of synchronous frame headers used for framing. In this way, the position information of the frame header can be effectively located under the condition of a preset count beat.

Optionally, according to different communication scenarios of the application, when the delay measurement device measures the delay difference of the receiving end channel, there may be the following possible implementation manners:

In a possible implementation, if the delay measurement method is applied to a colorless scenario, the transmitting frequency of the transmitting channel is f1, and the receiving local oscillator light source frequency of each receiving channel in the N receiving channels is f1. When the delay measurement device controls the one originating end to send the first optical port frame according to the f1.

In another possible implementation manner, if the delay measurement method is applied to a WSS scenario, the transmitting frequency of the one transmitting channel is set to f1 to fn in sequence according to the time division, and the receiving local oscillator light source frequencies of the N receiving channels are It is set as f1 to fn in sequence, and at this time, the delay measurement device controls the one originating channel to transmit the first optical port frame according to f1 to fn in sequence in time-division.

Optionally, the length of the preset count beat is equal to an integer multiple of the length of the optical port frame.

In a second aspect, the present application provides a delay measurement method. In the delay measurement method, the delay measurement device further includes adding an optical loopback device to the communication system, and the optical loopback device includes an optical coupler, an optical amplifier and an optical switch. , which is mainly used to form a communication channel between the receiving end and the sending end. The delay measuring device starts the optical loopback device by controlling the optical switch. The delay measurement device controls the N originating channels in the communication channel to transmit the first optical port frame in time-division and sequentially, and the communication channel is formed by opening the optical loopback device by the delay measuring device, and the communication channel includes N originating channels. and a receiving end channel, the transmitting end frequency of each transmitting end channel in the N transmitting end channels is the same as the receiving local oscillator light source frequency of the one receiving end channel; N pieces of first frame header position information of the first optical port frame in the one receiving end channel; The originating delay is poor.

In this embodiment, in order to minimize the insertion loss of the signal optical path in the optical loopback device, the optical coupler may use a coupler with a low coupling coefficient (for example, the coupling coefficient is less than -15dB). Since an optical coupler with low coupling coefficient is used, the optical loopback device also needs to add an optical amplifier to amplify the power of the loopback optical signal. In order to realize normal operation after the delay measurement and the delay compensation are completed, the optical switch in the optical loopback device completely turns off the loopback channel after the delay measurement is completed.

In the technical solution provided by this embodiment, the delay measurement device forms a multiple-transmit-one-receive communication channel through an optical loopback device, sends an optical port frame through the transmitting end channel, and the receiving end channel determines the frame header position information in the process of receiving the optical port frame , so as to determine the delay difference between each receiving end channel. In this way, the delay measurement device realizes the independent measurement of the delay difference between the sending end of the sending end channel according to the coordinated tuning of the multi-channel light source and the digital high-precision cooperative counting, thereby meeting the requirements of the super channel system to distinguish the delay difference between the sending end and the receiving end. .

Optionally, in this embodiment, after acquiring the transmitter delay difference, the delay measurement apparatus may perform delay compensation on the transmitter channel according to the transmitter delay difference. Usually, a digital system can be used for delay compensation, such as delay compensation through a shift register. The specific method is not limited here.

Optionally, after the delay measuring device obtains the delay difference of the transmitting end of the receiving end channel and performs delay compensation, the delay measuring device can perform corresponding delay measurement on the receiving end channel, which specifically includes the following: possible implementations:

In a possible implementation manner, the delay measurement device controls the N originating channels in the communication channel to send the second optical port frame, and the communication channel is formed by opening the optical loopback device by the delay measurement device, wherein, The communication channel includes N transmitting end channels and the N receiving end channels, and the transmitting end frequency of each transmitting end channel in the N transmitting end channels and the receiving end channel of each receiving end channel in the N receiving end channels. The frequencies of the vibration sources are in one-to-one correspondence and are the same; the delay measurement device determines the second frame header position information of the second optical port frame in each of the N receiving end channels under a preset count beat ; the delay measuring device calculates the difference of the end delays between the N end channels according to the position information of the second frame header of each end channel in the N end channels. In this scheme, the transmitter delay difference of the transmitter channel has been compensated, so the transmitter delay difference is 0. Therefore, in this scheme, the multi-channel light source co-tuning and digital high-precision cooperative counting are used to calculate the receiver channel's delay difference. The delay difference at the receiving end is not affected by the delay difference at the sending end, and is only used to indicate the delay difference at the receiving end. At the same time, in this solution, since the frequency of the transmitter is different between the channels of the transmitter, the frequency of the local oscillator light source of the receiver is also different between the channels of the receiver, so there is no interference problem. That is, this solution can be applied to multiple drop scenarios, such as colorless drop scenarios and WSS drop scenarios.

In another possible implementation manner, the delay measurement device then controls the one originating channel in the communication channel to send a third optical port frame, wherein the communication channel is activated by the delay measurement device by controlling the optical switch to start the optical loopback The device is formed, wherein, the communication channel includes a sending channel and N receiving channels, and the value of N is a positive integer; the optical port frame is used to locate the frame header position information, so as to determine the delay difference; then the delay The time measuring device determines the third frame header position information of the third optical port frame in each of the N receiving end channels under a preset count beat, wherein each receiving end of the N receiving end channels The receiving source frequency of the channel is in one-to-one correspondence with the sending frequency of the transmitting channel; finally, the delay measurement device calculates the difference between the N receiving end channels according to the third frame header position information of each receiving end channel in the N receiving end channels. The delay difference between the receivers. In this scheme, there is only one transmitter channel, so the transmitter delay difference is already 0. In this scheme, the receiver delay difference of the receiver channel calculated by multi-channel light source co-tuning and digital high-precision cooperative counting has no transmitter delay. The effect of time difference. At the same time, in this scheme, since there is only one transmit-end channel, the transmit-end channel no longer needs to perform delay compensation, so the scheme of measuring the receive-end delay difference in this scheme can be implemented independently. That is, this solution can be used after delay compensation is performed on the originating channel, or it can be used when delay compensation is not performed on the originating channel.

Based on this solution, according to different communication scenarios of the application, when the delay measurement device measures the delay difference of the receiving end channel, the following possible implementations may be adopted:

In this embodiment, after acquiring the receiving end delay difference, the delay measuring device can perform delay compensation on the receiving end channel according to the receiving end delay difference. Usually, a digital system can be used to perform delay compensation, and the specific method is not limited here.

In a third aspect, the present application provides a delay measurement device, which has the function of implementing the behavior of the delay measurement device in the first aspect. This function can be implemented by hardware or by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions.

In a possible implementation manner, the apparatus includes units or modules for performing the steps of the above first aspect. In a possible implementation manner, the device includes a control module configured to control an originating channel in the first communication channel to send a first optical port frame, and the first communication channel is formed by the delay measurement device opening an optical loopback device. , the first communication channel includes an originating channel and N terminating channels, where N is a positive integer; a processing module, configured to determine each terminating channel in the N terminating channels under a preset count beat In the first frame header position information of the first optical port frame, the receiving local oscillator light source frequency of each receiving end channel in the N receiving end channels corresponds to the transmitting end frequency of the transmitting end channel one-to-one; according to the The first frame header position information of each of the N end channels is used to calculate the end delay difference between the N end channels.

Optionally, it also includes a storage module for storing necessary program instructions and data of the delay measurement device.

In a possible implementation manner, when the delay measurement device is a chip, the chip includes: a processing unit and a transceiver unit, the processing unit may be, for example, a processor, and the processor is used to control one of the first communication channels The transmitting end channel sends the first optical port frame, the first communication channel is formed by the delay measuring device opening the optical loopback device, the first communication channel includes one transmitting end channel and N receiving end channels, and N is positive Integer; determine the first frame header position information of the first optical port frame in each of the N receiving end channels under the preset count beat, and each receiving end of the N receiving end channels The receiving local oscillator light source frequency of the channel is in one-to-one correspondence with the transmitting end frequency of the transmitting end channel; according to the position information of the first frame header of each receiving end channel in the N receiving end channels, the distance between the N receiving end channels is calculated. Receiver delay difference. The transceiver unit may be, for example, an input/output interface, a pin or a circuit on the chip, and transmits the control signaling generated by the processor to other chips or modules coupled to the chip. The processing unit can execute the computer-executed instructions stored in the storage unit, so as to support the delay measurement apparatus to perform the method provided in the first aspect. Optionally, the storage unit can be a storage unit in the chip, such as a register, a cache, etc., and the storage unit can also be a storage unit located outside the chip, such as a read-only memory (read-only memory, ROM) or a memory unit. Other types of static storage devices that store static information and instructions, random access memory (RAM), etc.

In a possible implementation manner, the device further includes a communication interface and a logic circuit, where the communication interface is used for transmitting control instructions; the logic circuit is used for controlling an originating channel in the first communication channel to send the first optical port frame, The first communication channel is formed by turning on the optical loopback device by the delay measurement device, the first communication channel includes a transmitting end channel and N receiving end channels, and N is a positive integer; determined at a preset count beat The position information of the first frame header of the first optical port frame in each of the N receiving end channels, and the received local oscillator light source frequency of each of the N receiving end channels and the The sending end frequencies of the sending end channels are in one-to-one correspondence; the receiving end delay difference between the N receiving end channels is calculated according to the position information of the first frame header of each receiving end channel of the N receiving end channels.

Wherein, the processor mentioned in any of the above may be a general-purpose central processing unit (Central Processing Unit, CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more An integrated circuit for controlling program execution of the data transmission methods of the above aspects.

In a fourth aspect, the present application provides a delay measurement device, which has the function of implementing the behavior of the delay measurement device in the second aspect. This function can be implemented by hardware or by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions.

In a possible implementation manner, the apparatus includes units or modules for performing the steps of the second aspect above. In a possible implementation manner, the device includes a control module for controlling the N originating channels in the communication channel to transmit the first optical port frame in time-division and sequentially, and the communication channel is formed by opening the optical loopback device by the delay measurement device, The communication channel includes N transmitting end channels and one receiving end channel, and the transmitting end frequency of each transmitting end channel in the N transmitting end channels is the same as the receiving local oscillator light source frequency of the one receiving end channel; the determining module is used for The N pieces of first frame header position information of the first optical port frame in the one receiving channel are sequentially determined under a preset count beat; The delay difference between the originating ends.

In a possible implementation manner, when the delay measurement device is a chip, the chip includes: a processing unit and a transceiver unit, the processing unit may be, for example, a processor, and the processor is used to control the N originating ends in the communication channel The channel transmits the first optical port frame sequentially in time division, the communication channel is formed by the delay measurement device opening the optical loopback device, the communication channel includes N transmitting end channels and one receiving end channel, each of the N transmitting end channels The transmitting frequency of one transmitting channel is the same as the receiving local oscillator light source frequency of the one receiving channel; the N first frame headers of the first optical port frame in the one receiving channel are sequentially determined under a preset count beat location information; calculate the originating delay difference between the N originating channels according to the N pieces of first frame header location information. The transceiver unit may be, for example, an input/output interface, a pin or a circuit on the chip, and transmits the control signaling generated by the processor to other chips or modules coupled to the chip. The processing unit can execute the computer-executable instructions stored in the storage unit, so as to support the delay measurement apparatus to perform the method provided in the second aspect. Optionally, the storage unit can be a storage unit in the chip, such as a register, a cache, etc., and the storage unit can also be a storage unit located outside the chip, such as a read-only memory (read-only memory, ROM) or a memory unit. Other types of static storage devices that store static information and instructions, random access memory (RAM), etc.

In a possible implementation manner, the device further includes a communication interface and a logic circuit, where the communication interface is used for transmitting control instructions; the logic circuit is used for controlling the N originating channels in the communication channel to transmit the first optical ports sequentially in time-division frame, the communication channel is formed by turning on the optical loopback device by the delay measurement device, the communication channel includes N transmitting end channels and one receiving end channel, and the transmitting end frequency of each transmitting end channel in the N transmitting end channels is the same as that of the A receiving end channel receives the same frequency of the local oscillator light source; a determination module is used to sequentially determine the position information of N first frame headers of the first optical port frame in the one receiving end channel under a preset count beat; according to The N pieces of first frame header position information are used to calculate the originating delay difference between the N originating channels.

In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, where computer instructions are stored in the computer storage medium, and the computer instructions are used to execute the method in any possible implementation manner of any one of the foregoing aspects.

In a sixth aspect, the embodiments of the present application provide a computer program product including instructions, which, when executed on a computer, cause the computer to execute the method in any one of the foregoing aspects.

Description of drawings

FIG. 1 is an exemplary schematic diagram of the spectrum distribution of a traditional dense lightwave multiplexing DWDM system;

FIG. 2 is an exemplary schematic diagram of the output spectrum of a super channel optical module;

3 is an exemplary schematic diagram of an optical fiber communication system;

Fig. 4 is an exemplary schematic diagram of a superchannel system channel model;

5 is an exemplary schematic diagram of a super channel system channel in an embodiment of the present application;

6 is a schematic diagram of an exemplary configuration of a super channel system channel in an embodiment of the present application;

FIG. 7 is a schematic diagram of an embodiment of delay measurement in an embodiment of the present application;

8 is a schematic diagram of determining the delay difference between channels according to frame header position information in an embodiment of the present application;

9 is a schematic diagram of an experimental result of measuring the delay difference at the receiving end in the embodiment of the application;

FIG. 10 is a schematic diagram of delay compensation in an embodiment of the present application;

11 is another exemplary configuration diagram of the super channel system channel in the embodiment of the application;

FIG. 12 is a schematic diagram of another embodiment of delay measurement in an embodiment of the present application;

13 is a schematic diagram of determining the delay difference between channels according to frame header position information in an embodiment of the present application;

14 is a schematic diagram of an experimental result of measuring the delay difference of the receiving end in the embodiment of the application;

15 is another exemplary configuration diagram of the super channel system channel in the embodiment of the application;

FIG. 16 is a schematic diagram of another embodiment of delay measurement in an embodiment of the present application;

17 is a schematic diagram of an experimental result of measuring the delay difference between the originating ends in the embodiment of the present application;

FIG. 18 is another exemplary configuration diagram of the super channel system channel in the embodiment of the application;

FIG. 19 is a schematic diagram of another embodiment of delay measurement in an embodiment of the present application;

FIG. 20 is a schematic flowchart of a time-division multiplexing of N originating channels to transmit optical port frames in an embodiment of the present application;

21 is a schematic diagram of determining the delay difference between channels according to frame header position information in an embodiment of the present application;

FIG. 22 is another exemplary configuration diagram of the super channel system channel in the embodiment of the application;

FIG. 23 is a schematic diagram of another embodiment of delay measurement in an embodiment of the present application;

24 is a schematic diagram of determining the delay difference between channels according to frame header position information in an embodiment of the present application;

25 is a schematic flowchart of delay measurement in a colorless scene in an embodiment of the present application;

26 is a schematic flowchart of delay measurement in a WSS scenario in an embodiment of the present application;

FIG. 27 is a schematic diagram of an embodiment of a delay measurement device in an embodiment of the present application;

FIG. 28 is a schematic diagram of another embodiment of the delay measurement device in the embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application are described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. . Those of ordinary skill in the art know that with the emergence of new application scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

The terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It is to be understood that data so used may be interchanged under appropriate circumstances so that the embodiments described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or modules is not necessarily limited to those expressly listed Rather, those steps or modules may include other steps or modules not expressly listed or inherent to the process, method, product or apparatus. The naming or numbering of the steps in this application does not mean that the steps in the method flow must be executed in the time/logical sequence indicated by the naming or numbering, and the named or numbered process steps can be implemented according to the The technical purpose is to change the execution order, as long as the same or similar technical effects can be achieved. The division of units in this application is a logical division. In practical applications, there may be other division methods. For example, multiple units may be combined or integrated into another system, or some features may be ignored. , or not implemented, in addition, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, and the indirect coupling or communication connection between units may be electrical or other similar forms. There are no restrictions in the application. In addition, the units or sub-units described as separate components may or may not be physically separated, may or may not be physical units, or may be distributed into multiple circuit units, and some or all of them may be selected according to actual needs. unit to achieve the purpose of the scheme of this application. The terminology used in this application is for the purpose of describing particular embodiments only, and is not intended to be limiting of the application. As used in the specification of this application and the appended claims, the singular expressions "a," "an," "the," "above," "the," and "the" are intended to also Expressions such as "one or more" are included unless the context clearly dictates otherwise. It should also be understood that, in this embodiment of the present application, "one or more" refers to one, two or more; "and/or", which describes the association relationship of associated objects, indicates that there may be three kinds of relationships; for example, A and/or B can mean that A exists alone, A and B exist simultaneously, and B exists independently, wherein A and B can be singular or plural. The character "/" generally indicates that the associated objects are an "or" relationship.

The delay measurement method provided in the embodiment of the present application is mainly applied to an optical fiber communication system, which includes multiple transmit-end channels, multiple receive-end channels, an optical loopback device, and a delay measurement device. In an exemplary solution, as shown in FIG. 5, a transmission side digital signal processor (TXDSP), a digital analog converter (DAC), a driver (Drivers) and a Mach-Zehnder An interferometer (Mach-Zehnder, MZ) constitutes a transmitter channel; a receiver side digital signal processor (RXDSP), an analog-to-digital converter (ADC) and an integrated coherent receiver (integrated coherent receiver) , ICR) to form a receiving end channel; the optical loopback device includes an optical coupler, an optical amplifier and an optical switch. An exemplary solution of the optical loopback device may be shown in FIG. 5 . The transmission path of the optical signal under this structure is as follows:

When the optical loopback device is turned off (that is, when the optical fiber communication system is working normally), the optical signals output by the multiple originating channels are combined by a combiner (such as the MUX in Figure 6), and input to the optical coupler (as shown in Figure 6). The O-Coupler connected to the originating channel in 5); then input to the optical coupler through the fiber channel (as shown in Figure 5, the O-Coupler connected to the receiving channel); Demultiplexing, and finally the ICR corresponding to each receiving channel receives the optical signal sent by the corresponding transmitting channel.

When the optical loopback device is turned on (that is, when the optical module in the optical fiber communication system is powered on), the optical loopback device will form a corresponding communication channel according to the actual situation, so that the optical signal output by the originating channel can be transmitted through the optical loopback device to the the receiving end channel. Assuming that the delay measurement device includes one transmit-end channel and multiple receive-end channels, the optical loopback device will form a one-transmit-multiple-receive communication channel.

On this basis, the delay measurement method provided by the embodiment of the present application may be as follows: the delay measurement device controls one originating channel in the first communication channel to send the first optical port frame, wherein the first communication channel is sent by the delay channel. The time measurement device is formed by controlling the optical switch to start the optical loopback device, the first communication channel includes a transmitting end channel and N receiving end channels, and the value of N is a positive integer; the first optical port frame is used for positioning frame header position information, so as to determine the delay difference; then the delay measurement device determines the first frame header position information of the first optical port frame in each of the N receiving end channels under a preset count beat , wherein the receiving local oscillator light source frequency of each receiving end channel in the N receiving end channels corresponds to the sending frequency of the transmitting channel one-to-one; finally, the delay measuring device is based on each receiving end channel of the N receiving end channels. The first frame header position information of the channel is used to calculate the end delay difference between the N end channels.

In this embodiment, the end delay difference between the N end channels is the end delay difference between each end channel relative to the reference end channel. In an exemplary solution, the receiving end channel 1 in the N receiving end channels is set as the reference receiving end channel, then the receiving end delay difference includes the delay difference between the receiving end channel 2 and the receiving end channel 1. , the delay difference between the receiving end channel 3 and the receiving end channel 1, the delay difference between the receiving end channel 4 and the receiving end channel 1, and so on. Optionally, the receiving end delay difference can also be recorded as .

Similarly, the difference in the transmission delay between the N transmission channels is the difference in transmission delay between each transmission channel and the reference transmission channel. An exemplary solution is, for example, setting the originating channel 1 of the N originating channels as the reference originating channel, then the originating delay difference is the delay difference between originating channel 2 and originating channel 1, the originating channel 3 and originating channel 1 The delay difference between the originating channel 1, the delay difference between the originating channel 4 and the originating channel 1, and so on.

Optionally, at the originating end, record the inter-channel delay difference as

where i and j represent the channel number, respectively. At the receiving end, the delay difference between channels is recorded as

where i and j represent the channel number, respectively. It can be understood that, when a reference receiving end channel or a transmitting end channel is selected in the calculation, the i or the j value is a fixed value from 1 to N, and the other can be 1 to N. For example, if the originating channel 1 is used as the reference originating channel, then the originating delay difference is

or

Taking the receiving end channel 2 as the reference receiving end channel, the delay difference of the receiving end is

or

Preset count beat: The basic period is based on the frame length of the optical port frame, which can be an integer multiple of the frame length of the optical port frame.

The delay measurement method in this embodiment of the present application will be described below with a specific scenario. Referring to FIG. 6 , a schematic diagram of a communication channel configuration of an optical fiber communication system in a colorless scenario in an embodiment of the present application is shown. The delay measurement device enables one transmitter channel and sets the transmitter frequency to f1, N receiver channels and sets the receiver local oscillator light source frequency of the receiver channel to be f1, starts RXDSP, and turns on the The optical loopback device forms a transmit-multiple-receive communication channel, wherein the N receive end channels are all receive end channels in the SC. The specific process of the delay measurement based on this scenario can be shown in Figure 7:

701. The one originating channel sends an optical port frame according to the originating frequency f1.

The one originating channel inserts a known sequence of synchronization frame headers for framing into the optical port frame.

It can be understood that, in this embodiment, the optical port frame information is carried in an optical signal, and the originating channel implements the transmission of the optical port frame by sending an optical signal carrying the optical port frame information.

702. The N receiving end channels receive the optical port frame.

In this embodiment, the optical port frame is amplified after passing through the optical loopback device, and divided into N optical port frames by the demultiplexer, and then the N receiving end channels all receive the optical port frame at the same time .

703. The RXDSP determines the frame header position information of the optical port frame in each receiving end channel under a preset count beat.

The RXDSP determines the frame header position information of the optical port frame received by each receiving end channel under a uniform preset count beat. An exemplary solution, as shown in Figure 8, assumes that CH1 is the first receiving end channel, CH2 is the second receiving end channel, SYNC is the frame synchronization known sequence in the optical interface frame, and the payload is other in the optical interface frame. load data. Each receiving end channel receives the same optical port frame, and then due to the difference in the receiving end delay of the receiving end channel, the frame header position information of the optical port frame received by each receiving end channel at the same time will be different. In this embodiment, a correlation curve can be obtained through the correlation operation between the known frame synchronization sequence and the signal, and the peak position of the correlation curve is the position of the frame header of each channel.

704. The RXDSP calculates, according to the position information of the frame header, a receiving end delay difference between each receiving end channel.

After the RXDSP obtains the frame header position information of the optical port frames received by each receiving end channel at the same time, the RXDSP calculates the receiving end delay difference between each receiving end channel according to the frame header information. As shown in FIG. 8 , the end delay difference between the two end channels is equal to the time difference between the frame headers of the two end channels reaching the same position.

An experimental result of the delay measurement using the above method can be shown in FIG. 9 . In this experimental scenario, the application scenario is a colorless drop-off scenario, where the receiver delay of channel 1 is set to 300 picoseconds (ps), the receiver delay of channel 2 is set to 500ps, and the test baud rate is 144GHz . However, the peak position of the curve CH1 (corresponding to the channel 1) is 929, and the peak position of the curve CH2 (corresponding to the channel 2) is 958. It can be seen that the peak position difference between the two channels is 29 unit interval (UI), and the end delay difference between the channels is 29UI, which is approximately equal to 201.5ps. Compared with the set delay difference between channels of 200ps, the error meets the accuracy requirements of delay measurement. That is, the above delay measurement can be applied to actual scenarios.

After acquiring the difference in the end delays between the respective end channels, the RXDSP can perform delay compensation on each end channel according to the difference in the end delays of the end ends in the manner shown in FIG. 10 .

Referring to FIG. 11 , a schematic diagram of a communication channel configuration of an optical fiber communication system in a WSS scenario in an embodiment of the present application is shown. Wherein, the delay measurement device enables one transmit end channel and sets the transmit end frequency to be f1 to fn, N receive end channels and sets the receiver local oscillator light source frequency of the receive end channel to be f1 to fn in sequence, and starts RXDSP , and turn on the optical loopback device to form a transmit-multiple-receive communication channel, wherein the N receive end channels are all receive end channels in the SC. The specific process of the delay measurement based on this scenario can be shown in Figure 12:

1201. The one originating channel sends optical port frames in sequence according to the originating frequencies f1 to fn according to a preset count beat.

In this embodiment, the one originating channel traverses the carrier center frequencies f1 to fn of each channel in sequence according to a preset count beat, and transmits the optical port frame in sequence. In an exemplary solution, the optical port frame is sent according to the originating frequency f1 at the first moment, the optical port frame is sent according to the originating frequency f2 at the second moment, and the optical port frame is sent according to the originating frequency f3 at the third moment, and so on. The optical port frame is sent on frequency fn. Wherein, the time interval between the first moment and the second moment (ie, the preset count beat) is equal to an integer multiple of the frame length of the optical port frame. Wait until the one originating channel inserts the known sequence of the synchronization frame header used for framing into the frame of the optical port.

It can be understood that when the transmitting channel sends the optical port frame, the sending sequence can be arbitrary, as long as the receiving channel can receive it correctly. In this embodiment, the optical port frame information is carried in an optical signal, and the originating channel implements the transmission of the optical port frame by sending an optical signal carrying the optical port frame information.

1202. The N receiving end channels receive the optical port frame.

In this embodiment, the transmitting-end light source of the transmitting-end channel sequentially communicates with each receiving-end channel in a frequency sweep manner. That is, when the frequency of the transmitting end transmitted by the transmitting end channel is f1, the transmitting end channel is only connected to the receiving end channel whose frequency of the local oscillator light source of the receiver is f1. In an exemplary solution as shown in FIG. 11 , when the transmitting frequency is f1, the transmitting channel 1 communicates with the receiving channel 1; when the transmitting frequency is f2, the transmitting channel 1 communicates with the receiving channel 2; ...when the sending frequency is fn, the sending channel 1 is connected to the receiving channel n.

1203. The RXDSP determines the frame header position information of the optical port frame in each receiving end channel under a preset count beat.

The RXDSP performs frame count alignment on the frame header position information of the optical port frame received by each receiving end channel under a uniform preset count beat. The specific method can be shown in Figure 13, the length M of the abscissa (that is, 0 to M-1) is used to indicate the frame length of the optical port frame, and the preset count beat is twice the frame length of the optical port frame (may be It should be understood that the preset count beat may also be 3 times or 4 times the optical port frame, as long as it is an integer multiple, which is not specifically limited here). During the frame length of the first optical port frame, the transmitting end channel sends the optical port frame to the receiving end channel 1 according to the transmitting end frequency f1, and the RXDSP determines the frame header position information of the optical port frame received by the receiving end channel 1; After the frame length of the optical port frame, the transmitting end channel sends the optical port frame to the receiving end channel 2 according to the transmitting end frequency f2. The RXDSP determines that the receiving end channel 2 receives the frame header position information of the optical port frame, and circulates in turn until the determination is completed. The frame header position information of channel N at the receiving end. In this embodiment, a correlation curve can be obtained through the correlation operation between the known frame synchronization sequence and the signal, and the peak position of the correlation curve is the position of the frame header of each channel.

1204. The RXDSP calculates, according to the position information of the frame header, a receiving end delay difference between each receiving end channel.

An experimental result of the delay measurement using the above method can be shown in FIG. 14 . In this experimental scenario, the application scenario is the WSS drop-off scenario, where the receiver delay of channel 1 is set to 300 picoseconds (ps), the receiver delay of channel 2 is set to 500ps, and the test baud rate is 144GHz . However, the peak position of the curve CH1 (corresponding to the channel 1) is 929, and the peak position of the curve CH2 (corresponding to the channel 2) is 958. It can be seen that the peak position difference between the two channels is 29 unit interval (UI), and the end delay difference between the channels is 29 UI, which is approximately equal to 201.5ps. Compared with setting the receiver delay difference between channels to 200ps, the error meets the accuracy requirements of delay measurement. That is, the above delay measurement can be applied to actual scenarios.

After the above delay compensation is performed on the receiving end channel, the delay measuring device may measure the transmitting end delay difference of the transmitting end channel. Referring to FIG. 15 , a schematic diagram of a communication channel configuration of an optical fiber communication system in an embodiment of the present application is shown. Wherein, the delay measurement device enables N transmitter channels and sets the transmitter frequencies to be f1 to fn in sequence, and N receiver channels and sets the receiver local oscillator light source frequencies of the receiver channels to be f1 to fn in sequence, The RXDSP is activated, and the optical loopback device is activated to form a multi-transmit and multi-receive communication channel, wherein the N receiving end channels are all the receiving end channels in the SC, and the N transmitting end channels are all the transmitting end channels in the SC. It can be understood that the communication channel configuration shown in FIG. 15 can be applied to colorless scenarios and WSS scenarios. At this time, the specific process of the delay measurement can be shown in Figure 16:

1601. The N originating channels send optical port frames according to the set originating frequency.

In this embodiment, the transmission frequency of the transmission channel 1 may be set as f1, the transmission frequency of the transmission channel 2 as f2, and so on, the transmission frequency of the transmission channel N is fn. Then each originating channel transmits the optical port frame according to the originating frequency set by itself. The N originating channels insert a known sequence of synchronization frame headers for framing into the optical port frame.

In this embodiment, the optical port frame information is carried in an optical signal, and the originating channel implements the transmission of the optical port frame by sending an optical signal carrying the optical port frame information.

1602. The N receiving end channels receive the optical port frame.

In this embodiment, the N receiving end channels are connected with the N transmitting end channels in a one-to-one correspondence through the frequency of the local oscillator light source of the receiver, and then the N receiving end channels all receive the optical port frame at the same time.

1603. The RXDSP determines the frame header position information of the optical port frame in each receiving end channel under a preset count beat.

1604. The RXDSP calculates, according to the position information of the frame header, the difference in the transmission delay between each receiving end channel.

After acquiring the frame header position information of the optical port frame received by each receiving channel, the RXDSP calculates the delay difference between each transmitting channel according to the frame header information. It can be understood that after the completion of the delay difference compensation of the receiving end channel, the difference of the frame header position information detected in the receiving end channel will be caused by the delay of the transmitting end channel. The position information of the frame header of the channel receiving optical port frame will calculate the delay difference between the originating ends of the originating channels.

An experimental result of the delay measurement using the above method can be shown in FIG. 17 . In this experimental scenario, the application scenario is a colorless drop-off scenario, in which the receiving end delay difference between channels is 0, the sending end delay of channel 1 is set to 300 picoseconds (ps), and the sending end delay of channel 2 is set to 300 picoseconds (ps). It is set to 800ps, and the test baud rate is 144GHz. However, the peak position of the curve CH1 (corresponding to the channel 1) is 886, and the peak position of the curve CH2 (corresponding to the channel 2) is 958. It can be seen from this that the peak position difference between the two receiving end channels is 72 unit interval (UI), and the delay difference between channels is 72 UI, which is approximately equal to 500ps. Compared with setting the delay difference between the transmitter and the channel to 500ps, the error meets the accuracy requirements of the delay measurement. That is, the above delay measurement can be applied to actual scenarios.

After acquiring the difference in the transmission delay between the various transmission channels, the TXDSP can perform delay compensation on each transmission channel according to the difference in the transmission delay in the manner shown in FIG. 10 .

Referring to FIG. 18, another schematic diagram of the communication channel configuration of the optical fiber communication system in the embodiment of the present application is shown. Among them, the delay measurement device enables N transmitter channels and sets the transmitter frequency to f1, one receiver channel and sets the receiver local oscillator light source frequency of the receiver channel to f1, starts RXDSP, and turns on the halo The return device forms a multiple-transmit-one-receive communication channel, wherein the N originating channels are all originating channels in the SC. The specific process of the delay measurement based on this scenario can be shown in Figure 19:

1901. The N originating channels sequentially transmit optical port frames according to a preset count beat and the originating frequency f1.

In this embodiment, the N originating channels transmit the optical port frame sequentially according to the originating frequency f1 according to a preset count beat. In an exemplary solution, as shown in Figure 20, at T1, the originating channel 1 sends the optical port frame according to the originating frequency f1; The optical port frame is sent at the frequency f1, and the transmitting end channel N transmits the optical port frame according to the transmitting end frequency f1 until time Tn in sequence. Wherein, the time interval between time T1 and time T2 (ie, the preset count beat) is an integer multiple of the frame length of the optical port frame. The originating channel inserts a known sequence of synchronization frame headers for framing into the optical port frame.

It can be understood that, when the transmitting end channel sends the optical port frame, the sending sequence can be arbitrary, as long as the receiving end channel can receive it correctly. In this embodiment, the optical port frame information is carried in an optical signal, and the originating channel implements the transmission of the optical port frame by sending an optical signal carrying the optical port frame information.

1902. The one receiving end channel receives the optical port frame.

In this embodiment, the receiving end channel is sequentially communicated with the transmitting end channel. In an exemplary solution as shown in FIG. 18 , with a preset count beat as a time interval, at time T1, the sending channel 1 is connected to the receiving channel 1; at time T2, the sending channel 2 is connected to the receiving channel 1 is connected; ... at time Tn, the originating channel N communicates with the receiving end channel 1.

1903. The RXDSP determines the frame header position information of the optical port frame in each receiving end channel under a preset count beat.

The RXDSP performs frame count alignment on the frame header position information of the optical port frame received by the receiving end channel under a uniform preset count beat. The specific method can be shown in Figure 21, the length M of the abscissa (that is, 0 to M-1) is used to indicate the frame length of the optical port frame, and the preset count beat is twice the frame length of the optical port frame (may be It should be understood that the preset count beat may also be 3 times or 4 times the optical port frame, as long as it is an integer multiple, which is not specifically limited here). At time T1, the transmitting end channel 1 sends the optical port frame to the receiving end channel 1 according to the transmitting end frequency f1, and the RXDSP determines that the receiving end channel 1 receives the frame header position information of the optical port frame sent by the transmitting end channel 1; After the frame length of the port frame, at time T2, the transmitting end channel 2 sends the optical port frame to the receiving end channel 1 according to the transmitting end frequency f1, and the RXDSP determines that the receiving end channel 1 receives the frame of the optical port frame sent by the transmitting end channel 2. The header position information is circulated in turn until it is determined that the receiving end channel 1 has received the frame header position information of the optical port frame sent by the transmitting end channel N. In this embodiment, a correlation curve can be obtained through the correlation operation between the known frame synchronization sequence and the signal, and the peak position of the correlation curve is the position of the frame header of each channel.

1904. The RXDSP calculates, according to the position information of the frame header, the difference of the originating delay between each originating channel.

After acquiring the frame header position information of the optical port frame received by each receiving channel, the RXDSP calculates the delay difference between each transmitting channel according to the frame header information. It can be understood that since there is only one receiving channel and the receiving delay is a fixed value, the difference in the position information of the frame header detected by the receiving channel will be caused by the delay of the sending channel. The position information of the frame header of the channel receiving optical port frame will calculate the delay difference between the originating ends of the originating channels.

It can be understood that, because the receiving end delay of the receiving end channel in this scheme does not affect the calculation of the transmitting end delay difference between the transmitting end channels, this scheme can be used as a scheme for independently measuring the transmitting end delay difference. That is, the method for measuring the delay difference at the transmitting end shown in FIG. 18 to FIG. 20 and the above-mentioned method for measuring the delay difference at the receiving end can be measured independently.

In the colorless scenario, in order to independently measure the delay difference between the originating ends, another schematic diagram of the communication channel configuration of the optical fiber communication system as shown in FIG. 22 can be used. The delay measurement device enables N transmitter channels and sets the transmitter frequencies of each transmitter channel to be f1 to fn in sequence, and a receiver channel and sets the receiver local oscillator light source frequency of the receiver channel to be f1 in sequence. To fn, RXDSP is started, and the optical loopback device is turned on to form a transmit-multiple-receive communication channel, wherein the N transmit end channels are all transmit end channels in the SC. The specific process of the delay measurement based on this scenario can be shown in Figure 23:

2301. The N originating channels send optical port frames according to originating frequencies allocated by respective channels.

In this embodiment, the N transmitting end channels may include the following possible implementation manners when sending optical port frames according to the transmitting end frequencies allocated by the respective channels:

In a possible implementation manner, the N originating channels sequentially send the optical port frame according to a preset count beat. In an exemplary solution, as shown in Figure 22, at T1, the originating channel 1 sends the optical port frame according to the originating frequency f1, at T2, the originating channel 2 sends the optical port frame according to the originating frequency f2, and at T3, the originating channel 3 transmits the optical port frame according to the originating frequency f2. The optical port frame is transmitted at the frequency f3, and the transmitting end channel N transmits the optical interface frame according to the transmitting frequency fn in sequence until time Tn. Wherein, the time interval between time T1 and time T2 (ie, the preset count beat) is an integer multiple of the frame length of the optical port frame. The originating channel inserts a known sequence of synchronization frame headers for framing into the optical port frame.

In another possible implementation manner, the N originating channels transmit the optical port frame simultaneously according to originating frequencies allocated by the respective channels.

2302. The one receiving end channel receives the optical port frame.

In this embodiment, the frequency of the receiver local oscillator light source of the receiving end channel is sequentially set to f1 to fn by time division frequency sweeping, that is, the receiving end channel will communicate with the transmitting end channel in turn and receive the optical port frame. In an exemplary solution as shown in FIG. 22, with a preset count beat as a time interval, at time T1, the transmitting end channel 1 is connected to the receiving end channel 1, and the receiver local oscillator of the receiving end channel 1 is at this time. The frequency of the light source is the same as that of the source channel 1, which is f1; at time T2, the source channel 2 is connected to the receiver channel 1. At this time, the receiver local oscillator light source frequency of the receiver channel 1 is the same as that of the source channel 2. The sending end frequency is the same, which is f2; ... At Tn, the sending end channel N is connected to the receiving end channel 1. At this time, the receiver local oscillator light source frequency of the receiving end channel 1 is the same as the sending end frequency of the sending end channel N, which is fn .

2303. The RXDSP determines the frame header position information of the optical port frame in each receiving end channel under a preset count beat.

The RXDSP performs frame count alignment on the frame header position information of the optical port frame received by the receiving end channel under a uniform preset count beat. The specific method can be shown in Figure 24, the length M of the abscissa (that is, 0 to M-1) is used to indicate the frame length of the optical port frame, and the preset count beat is twice the frame length of the optical port frame (may be It should be understood that the preset count beat may also be 3 times or 4 times the optical port frame, as long as it is an integer multiple, which is not specifically limited here). At time T1, the transmitting channel 1 is connected to the receiving channel 1, and the RXDSP determines that the receiving channel 1 receives the frame header position information of the optical port frame sent by the transmitting channel 1; after an interval of the frame length of the optical interface frame , at time T2, the transmitting channel 2 is connected to the receiving channel 1, the RXDSP determines that the receiving channel 1 receives the frame header position information of the optical port frame sent by the transmitting channel 2, and loops in turn until the receiving channel is determined. 1 Receive the frame header position information of the optical port frame sent by the originating channel N. In this embodiment, a correlation curve can be obtained through the correlation operation between the known frame synchronization sequence and the signal, and the peak position of the correlation curve is the position of the frame header of each channel.

2304. The RXDSP calculates, according to the position information of the frame header, the difference in the originating delay between each originating channel.

The above-mentioned Figures 5 to 23 have described the measurement methods of the receiving end delay difference and the transmitting end delay difference by the delay measuring device. The measurement method is explained.

Referring to FIG. 25 , it is a schematic flow chart showing an exemplary flow of the delay measurement apparatus for measuring the delay difference between the receiving end and the transmitting end in a colorless scenario. Specifically include:

Turn on the optical loopback device to form an optical loopback channel; then start the receiving end measurement; then configure the one-transmit-multiple-receive optical communication channel, and configure the transmitting end frequency (LO) of the transmitting end channel 1 to be f1; configure the receivers of the receiving end channels 1 to N. The frequency of the receiving light source (LO) is all f1; the transmitting channel 1 is started to send the optical port frame (the other transmitting channels are disabled at this time); the receiving channel receives the optical port frame, and searches the frame to determine the frame header position information; The position information calculates the receiving end delay difference between the receiving end channels; compensates the receiving end delay difference between the receiving end channels; ends the receiving end measurement; starts the sending end measurement; The transmitting end frequencies (LO) to N are f1 to fn in sequence; the receiver local oscillator receiving light source frequencies (LO) of the receiving end channels 1 to N are in sequence f1 to fn; the transmitting end channel 1 to the transmitting end channel N send optical port frames; The receiving end channel receives the optical port frame, and searches the frame to determine the frame header position information; calculates the transmitting end delay difference between the receiving end channels according to the frame position information; compensates the receiving end delay difference between the transmitting end channels; ends the transmitting end measurement.

Referring to FIG. 26, it shows a schematic flowchart of a delay measurement apparatus for measuring the delay difference between the receiving end and the transmitting end in the WSS scenario. Specifically include:

Turn on the optical loopback device to form an optical loopback channel; then start the receiving end measurement; then configure a one-transmit-multiple-receive optical communication channel, and configure the transmit end frequency (LO) of the transmit end channel 1 to be fk in turn, where k ranges from 1 to N; Configure the receiver local oscillator receiving light source frequencies (LO) of the receiving end channels 1 to N to be f1 to fn in sequence; start the transmitting end channel 1 to send the optical port frame according to fk in sequence (the other transmitting end channels are not enabled at this time), until k is equal to N ; The receiving end channel k receives the optical port frame, and performs frame search to determine the frame header position information, which is the value of k from 1 to N; Calculate the end delay between the end channels through the frame position information of different end channels Time difference; compensate for the delay difference between the receiving end channels; end the receiving end measurement; start the sending end measurement; fn; configure the receiver local oscillator receiving light source frequencies (LO) of the receiving end channels 1 to N to be f1 to fn in sequence; the transmitting end channel 1 to the transmitting end channel N send the optical port frame; the receiving end channel receives the optical port frame and searches for the frame Determine the frame header position information; calculate the transmitter delay difference between the receiver channels through the frame position information; compensate the receiver delay difference between the transmitter channels; end the transmitter measurement.

The delay measurement method in the embodiment of the present application is described above, and the delay measurement device in the embodiment of the present application is described below.

Please refer to FIG. 27 for details. In this embodiment of the present application, the delay measurement apparatus 2700 includes: a control module 2701 and a processing module 2702, wherein the control module 2701 and the processing module 2702 are connected through a bus. The delay measuring apparatus 2700 may be used to perform part or all of the functions of the delay measuring apparatus in the above method embodiments.

For example, the control module 2701 can be used to execute steps 701 to 702, or steps 1201 to 1202, or steps 1601 to 1602, or steps 1901 to 1902, or steps 2301 to 2302 in the above method embodiments. For example, for example, the control module 2701 is configured to control an originating channel in the first communication channel to send the first optical port frame, the first communication channel is formed by the delay measurement device opening the optical loopback device, the first communication channel The channel includes one sending channel and N receiving channels, where N is a positive integer; the processing module 2702 may be configured to perform steps 703 to 704, or steps 1203 to 1204, or steps 1603 to 1604, Or steps 1903 to 1904, or steps 2303 to 2304. For example, the processing module 2702 is configured to determine the first frame header position information of the first optical port frame in each of the N receiving end channels under a preset count beat, and the N receiving end channels The receiving local oscillator light source frequency of each receiving end channel is in a one-to-one correspondence with the transmitting end frequency of the transmitting end channel; the N receiving end channels are calculated according to the first frame header position information of each receiving end channel in the N receiving end channels. Receive end delay difference between end channels.

Optionally, the delay measurement apparatus 2700 further includes a storage module, which is coupled with the processing module, so that the processing module can execute the computer-executed instructions stored in the storage module to implement the functions of the terminal in the above method embodiments. In one example, the optional storage module included in the delay measurement apparatus 2700 may be an in-chip storage unit, such as a register, a cache, and the like, and the storage module may also be a storage unit located outside the chip, such as a ROM or a storage unit that can store Other types of static storage devices for static information and instructions, RAM, etc.

It should be understood that the processes performed between the modules in the embodiment corresponding to FIG. 27 are similar to the processes performed by the delay measurement apparatus in the corresponding method embodiments in FIG. 5 to FIG. 26 , and details are not repeated here.

FIG. 28 shows a schematic structural diagram of a delay measurement apparatus 2800 in the above embodiment. The delay measurement apparatus 2800 may include: a processor 2802 , a computer-readable storage medium/memory 2803 , a transceiver 2804 , an input device 2805 and an output device 2806 , and a bus 2801 . Wherein, processors, transceivers, computer-readable storage media, etc. are connected through a bus. The embodiments of the present application do not limit the specific connection medium between the above components.

In an example, the transceiver 2804 is configured to send a control command, and the control command is used to control an originating channel in the first communication channel to send the first optical port frame, and the first communication channel is opened by the delay measurement device. An optical loopback device is formed, the first communication channel includes an originating channel and N receiving channels, and N is a positive integer;

The processor 2802 is configured to determine the first frame header position information of the first optical port frame in each of the N receiving end channels under a preset count beat, and the N receiving end channels The receiving local oscillator light source frequency of each receiving end channel is in a one-to-one correspondence with the transmitting end frequency of the transmitting end channel; the N receiving end channels are calculated according to the first frame header position information of each receiving end channel in the N receiving end channels. Receive end delay difference between end channels.

In yet another example, the processor 2802 may run an operating system to control functions between various devices and devices. The transceiver 2804 may include a baseband circuit and a radio frequency circuit. For example, the control command may be processed by the baseband circuit and the radio frequency circuit and then sent to an originating device, an optical loopback device, or a receiving end device.

The transceiver 2804 and the processor 2802 may implement the corresponding steps in any of the foregoing embodiments in FIG. 5 to FIG. 26 , and details are not repeated here.

It can be understood that FIG. 28 only shows a simplified design of the delay measurement device. In practical applications, the delay measurement device may include any number of transceivers, processors, memories, etc., and all of them can implement the The delay measurement devices are all within the scope of protection of the present application.

The processor 2802 involved in the above-mentioned apparatus 2800 may be a general-purpose processor, such as a CPU, a network processor (NP), a microprocessor, etc., or an ASIC, or one or more programs for controlling the solution of the present application. implemented integrated circuits. It may also be a digital signal processor (DSP), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, and discrete hardware components. The control module/processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like. Processors typically perform logical and arithmetic operations based on program instructions stored in memory.

The above-mentioned bus 2801 may be a peripheral component interconnect (PCI for short) bus or an extended industry standard architecture (EISA for short) bus or the like. The bus can be divided into address bus, data bus, control bus and so on. For ease of presentation, only one thick line is shown in FIG. 28, but it does not mean that there is only one bus or one type of bus.

The computer-readable storage medium/memory 2803 mentioned above may also store an operating system and other application programs. Specifically, the program may include program code, and the program code includes computer operation instructions. More specifically, the above-mentioned memory may be ROM, other types of static storage devices that can store static information and instructions, RAM, other types of dynamic storage devices that can store information and instructions, disk storage, and the like. Memory 2803 may be a combination of the above storage types. And the above-mentioned computer-readable storage medium/memory may be in the processor, outside the processor, or distributed over multiple entities including the processor or processing circuit. The computer-readable storage medium/memory described above may be embodied in a computer program product. By way of example, a computer program product may include a computer-readable medium in packaging materials.

Alternatively, the embodiments of the present application also provide a general-purpose processing system, for example, commonly referred to as a chip, and the general-purpose processing system includes: one or more microprocessors that provide processor functions; and an external memory that provides at least a part of a storage medium. , all of which are connected together with other support circuits through an external bus architecture. When the instructions stored in the memory are executed by the processor, the processor is caused to execute some or all of the steps in the delay measurement method of the first communication device in the embodiment of FIGS. other processes of the technology.

As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: The technical solutions recorded in the embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions in the embodiments of the present application.

Claims

A method for measuring time delay, comprising:

The delay measurement device controls an originating channel in the first communication channel to send a first optical port frame, the first communication channel is formed by the delay measurement device opening an optical loopback device, and the first communication channel includes an originating channel and N receiving end channels, where N is a positive integer;

The delay measurement device determines the first frame header position information of the first optical port frame in each of the N receiving end channels under a preset count beat, and the N receiving end channels are The receiving local oscillator light source frequency of each receiving end channel corresponds to the transmitting end frequency of the transmitting end channel one-to-one;

The delay measuring device calculates the difference in the end delay between the N end channels according to the position information of the first frame header of each end channel in the N end channels.
The method according to claim 1, wherein the method further comprises:

The delay measurement device performs delay compensation on the N receiving end channels according to the receiving end delay difference.
The method according to claim 2, wherein after the delay measurement device performs delay compensation on the N receiving end channels according to the receiving end delay difference, the method further comprises:

The delay measurement device controls N originating channels in the second communication channel to send second optical port frames, the second communication channel is formed by the delay measurement device opening the optical loopback device, and the second communication channel is formed by enabling the optical loopback device. The channel includes N transmitting end channels and the N receiving end channels, the transmitting end frequency of each transmitting end channel in the N transmitting end channels and the receiving local oscillator light source frequency of each receiving end channel in the N receiving end channels One-to-one correspondence and the same;

The delay measurement device determines the second frame header position information of the second optical port frame in each of the N receiving end channels under a preset count beat;

The delay measuring device calculates the difference in the delay between the N transmitting ends according to the position information of the second frame header of each of the N receiving channels.
The method according to claim 1 or 2, wherein the method further comprises:

The delay measuring device controls the N originating channels in the third communication channel to transmit third optical port frames in time-division and sequentially, the third communication channel is formed by the delay measuring device opening the optical loopback device, and the The third communication channel includes N transmitting end channels and one receiving end channel, and the transmitting end frequency of each transmitting end channel in the N transmitting end channels is the same as the receiving local oscillator light source frequency of the one receiving end channel;

The delay measuring device sequentially determines N third frame header position information of the third optical port frame in the one receiving end channel under a preset count beat;

The delay measuring apparatus calculates the difference in the transmission delay between the N transmission channels according to the position information of the N third frame headers.
The method according to claim 1 or 2, wherein the method further comprises:

The delay measurement device controls N originating channels in the fourth communication channel to send a fourth optical port frame, the fourth communication channel is formed by the delay measurement device opening the optical loopback device, and the fourth communication channel is formed by enabling the optical loopback device. The channel includes N transmitting end channels and one receiving end channel, the transmitting end frequencies of the 1 to N transmitting end channels are set to be f1 to fn in sequence, and the receiving local oscillator light source frequency of the one receiving end channel is set to f1 to fn;

The delay measuring device determines the position information of N fourth frame headers of the fourth optical port frame in the one receiving end channel in a time-division frequency sweeping manner under a preset count beat;

The delay measuring apparatus calculates the difference in the transmission delay between the N transmission channels according to the position information of the N fourth frame headers.
The method according to any one of claims 3 to 5, wherein the method further comprises:

The delay measurement device performs delay compensation on the N transmission end channels according to the transmission end delay difference.
The method according to any one of claims 1 to 6, wherein the frame header of the optical port frame is a known sequence of synchronous frame headers used for framing.
The method according to any one of claims 1 to 7, wherein, in the first communication channel, if the transmitting frequency of the transmitting channel is f1, each of the N receiving channels receives The receiving local oscillator light source frequency of the channel is f1, and the delay measuring device controls one of the originating channels in the first communication channel to send the first optical port frame including:

The delay measuring device controls one originating end in the first communication channel to send the first optical port frame according to the f1.
The method according to any one of claims 1 to 7, wherein, in the first communication channel, if the transmission frequency of the transmission channel is set to f1 to fn in sequence according to time division, the N The receiving local oscillator light source frequencies of the receiving end channel are set to be f1 to fn in sequence, and the delay measuring device controls one of the transmitting end channels in the first communication channel to send the first optical port frame including:

The delay measuring device controls one originating channel in the first communication channel to transmit the first optical port frames in sequence according to f1 to fn in time-division.
The method according to any one of claims 1 to 8, wherein the length of the preset count beat is equal to an integer multiple of the length of the optical port frame.
A delay measurement device, characterized in that, comprising:

A control module, configured to control an originating channel in the first communication channel to send a first optical port frame, the first communication channel is formed by the delay measurement device opening an optical loopback device, and the first communication channel includes an originating end channel and N receiving end channels, where N is a positive integer;

A processing module, configured to determine the first frame header position information of the first optical port frame in each of the N receiving end channels under a preset count beat, and each of the N receiving end channels The receiving local oscillator light source frequency of a receiving end channel is in one-to-one correspondence with the transmitting end frequency of the transmitting end channel; the N receiving ends are calculated according to the position information of the first frame header of each receiving end channel in the N receiving end channels Receive delay difference between channels.
The apparatus according to claim 11, wherein the processing module is further configured to perform delay compensation on the N receiving-end channels according to the receiving-end delay difference.
The device according to claim 12, wherein the control module is further configured to transmit the second optical port frame by the N originating channels in the second communication channel, and the second communication channel is measured by the delay The device turns on the optical loopback device to form, the second communication channel includes N transmit-end channels and the N receive-end channels, and the transmit-end frequency of each transmit-end channel in the N transmit-end channels is the same as that of the N receive-end channels. The receiving local oscillator light source frequencies of each receiving end channel in the end channel correspond one-to-one and are the same;

The processing module is further configured to determine the second frame header position information of the second optical port frame in each of the N receiving end channels under a preset count beat; according to the N receiving end channels; The position information of the second frame header of each of the end channels in the end channels is used to calculate the difference in the transmission delay between the N transmission channels.
The device according to claim 11 or 12, wherein the control module is further configured to transmit the third optical port frames in a time-division and sequential manner among the N originating channels in the third communication channel, and the third communication channel consists of The delay measurement device turns on the optical loopback device to form, the third communication channel includes N transmit-end channels and one receive-end channel, and the transmit-end frequency of each transmit-end channel in the N transmit-end channels is the same as that of the one receive-end channel. The receiving local oscillator light source frequency of the end channel is the same;

The processing module is further configured to sequentially determine N third frame header position information of the third optical port frame in the one receiving end channel under a preset count beat; according to the N third frame header positions The information calculates the difference in transmission delay between the N transmission channels.
The device according to claim 11 or 12, wherein the control module is further configured to send a fourth optical port frame through the N originating channels in the fourth communication channel, and the fourth communication channel is configured by the extension channel. When the measurement device turns on the optical loopback device, the fourth communication channel includes N transmitting end channels and one receiving end channel. The transmitting end frequencies of the 1 to N transmitting end channels are set to be f1 to fn in sequence, and the one receiving end channel The receiving local oscillator light source frequency of the end channel is set to f1 to fn;

The processing module is further configured to determine the position information of N fourth frame headers of the fourth optical port frame in the one receiving end channel in a time-division frequency sweep under a preset count beat; according to the N The fourth frame header position information is used to calculate the originating delay difference between the N originating channels.
The apparatus according to any one of claims 13 to 15, wherein the processing module is further configured to perform delay compensation on the N transmit end channels according to the transmit end delay difference.
The device according to any one of claims 11 to 16, wherein the frame header of the optical port frame is a known sequence of synchronization frame headers used for framing.
The apparatus according to any one of claims 11 to 17, wherein, in the first communication channel, if the transmission frequency of the transmission channel is f1, each of the N reception channels receives If the frequency of the receiving local oscillator light source of the channel is f1, the control module is specifically configured to control an originating end in the first communication channel to send the first optical port frame according to the f1.
The apparatus according to any one of claims 11 to 17, wherein, in the first communication channel, if the transmission frequency of the transmission channel is set to f1 to fn in sequence according to time division, the N The receiving local oscillator light source frequencies of the receiving channel are set to be f1 to fn in sequence, and the control module is specifically configured to control a transmitting channel in the first communication channel to transmit the first light according to f1 to fn in a time-sharing sequence. mouth frame.
The device according to any one of claims 11 to 18, wherein the length of the preset count beat is equal to an integer multiple of the length of the optical port frame.
An optical fiber communication system, characterized in that it includes:

Multiple transmitter channels, multiple receiver channels, optical loopback device and delay measurement device;

The optical loopback device is connected between the plurality of transmitting end channels and the plurality of receiving end channels;

The optical loopback device is configured to form a communication channel between the plurality of transmitting end channels and the plurality of receiving end channels;

The delay measuring device is used to perform the method of any one of the above claims 1 to 10 .
The system of claim 21, wherein the optical loopback device comprises a first optical coupler, an optical amplifier, an optical switch, and a second optical coupler, wherein the first optical coupler, the optical amplifier, the The optical switch and the second optical coupler are connected in sequence.
A computing storage medium, characterized in that the storage medium stores instructions, and when the instructions are executed on a computer, the computer executes the method described in any one of the preceding claims 1 to 10 .