CN-121984575-A - Ultra-low time delay fiber channel protection switching method and device

CN121984575ACN 121984575 ACN121984575 ACN 121984575ACN-121984575-A

Abstract

The application relates to the technical field of optical fiber communication and discloses an ultra-low time delay optical fiber channel protection switching method and device, wherein the method comprises the steps of sampling and photoelectric conversion of optical signals of a main optical fiber channel and a standby optical fiber channel to generate an optical power sampling value; the method comprises the steps of carrying out real-time filtering and calculation on a main optical power sampling value through a hardware acceleration circuit to obtain a main optical power real-time value, comparing the main optical power real-time value with a dynamic first optical power threshold value, generating a switching control signal in a single clock period through the hardware acceleration circuit when the main optical power real-time value is lower than the dynamic first optical power threshold value, outputting the switching control signal to an MEMS optical switch array in a high-speed differential electric signal mode, switching an optical path by the MEMS optical switch array according to the control signal, and switching a service from a main optical fiber channel to a standby optical fiber channel in a ready state. The apparatus is an entity for performing the method. By adopting the application, the time delay of the protection switching of the optical fiber channel can be reduced.

Inventors

XIN YANAN
GUO QINGRUI
HE LING
GUO XUERANG
YANG HUITING

Assignees

国网新疆电力有限公司电力科学研究院

Dates

Publication Date: 20260505
Application Date: 20260130

Claims (10)

1. An ultralow-delay fiber channel protection switching method is characterized by comprising the following steps: The optical power monitoring step is that optical signals of the main optical fiber channel and the standby optical fiber channel are sampled and subjected to photoelectric conversion treatment, and a main optical power sampling value and a standby optical power sampling value are generated; the fault judging step is that the real-time filtering and calculation are carried out on the received main optical power sampling value through a hardware accelerating circuit to obtain a main optical power real-time value, and the main optical power real-time value is compared with a dynamic first optical power threshold value, wherein the dynamic first optical power threshold value is dynamically calculated and generated based on the historical optical power statistical characteristics of the main optical fiber channel and a preset service priority coefficient; When the comparison operation result is that the real-time value of the main optical power is lower than the dynamic first optical power threshold value, generating and encoding a switching control signal in a single clock period through the hardware acceleration circuit, and outputting the switching control signal to the MEMS optical switch array in a high-speed differential electrical signal mode; And a channel switching step, wherein the MEMS optical switch array controls the state of an internal micro mirror array according to the switching control signal, and switches the physical route of the optical signal carrying the service from the main optical fiber channel to the standby optical fiber channel in a ready state.
2. The method according to claim 1, wherein in the optical power monitoring step, an optical splitter is used to couple the optical signal, and a photoelectric detector is used to perform the photoelectric conversion process.
3. The ultra-low latency fibre channel protection switching method of claim 1, wherein the hardware acceleration circuit is a field programmable gate array or an application specific integrated circuit.
4. The method for switching over an ultralow-delay optical fiber channel protection according to claim 1, wherein the calculating and generating process of the dynamic first optical power threshold comprises: calculating a historical average power value and a power standard deviation based on the main optical power sampling value in the sliding time window; Inquiring a preset mapping table according to the service priority to obtain a corresponding weight factor; The dynamic first optical power threshold is calculated according to the following formula: Wherein, the For the dynamic first optical power threshold, For the said historical average power value(s), As a function of the standard deviation of the power, As a result of the weight factor(s), And Is a preset adjustment coefficient.
5. The method of claim 1, further comprising, prior to the optical power monitoring step, a pre-configuring step of controlling the MEMS optical switch array to pre-connect the physical path of the backup fiber channel to the service receiving end and activate the light source of the backup fiber channel to a low power consumption operating state so that the backup fiber channel is in the ready state.
6. The ultra-low latency fibre channel protection switching method according to claim 5, wherein the pre-configuring step further comprises: Setting a pre-switching threshold, wherein the value of the pre-switching threshold is higher than the dynamic first optical power threshold; When the active optical power real time value is below the pre-switch threshold but above the dynamic first optical power threshold, a process is performed that places the backup optical fiber channel in the ready state.
7. The ultra-low latency fibre channel protection switching method of claim 1, further comprising, after the channel switching step, a verification step of: performing optical power sampling on the switched standby optical fiber channel; Judging whether the sampled optical power value is higher than a second optical power threshold value or not; if yes, judging that the switching is successful; If not, triggering channel abnormity alarm.
8. The ultra-low latency fibre channel protection switching method of claim 7, wherein the second optical power threshold is higher than the dynamic first optical power threshold.
9. The method of any one of claims 1 to 8, wherein in the channel switching step, the driving circuit of the MEMS optical switch array drives the micromirror array with a voltage pre-emphasis waveform, wherein an initial amplitude of the driving voltage is higher than a steady-state maintenance amplitude.
10. An ultra-low latency fibre channel protection switching device, the device comprising: A main optical fiber channel and a plurality of standby optical fiber channels; The optical power monitoring module is configured to sample and photoelectrically convert the optical signals of the main optical fiber channel and the standby optical fiber channel to generate a main optical power sampling value and a standby optical power sampling value; The hardware acceleration circuit is connected with the optical power monitoring module, is configured to perform real-time filtering and calculation on the received main optical power sampling value to obtain a main optical power real-time value, compares the main optical power real-time value with a dynamic first optical power threshold value, wherein the dynamic first optical power threshold value is generated by dynamic calculation based on historical optical power statistical characteristics of the main optical fiber channel and a preset service priority coefficient; And the driving port of the MEMS optical switch array is connected with the hardware acceleration circuit and is configured to control the state of the internal micro mirror array according to the received switching control signal, and the physical route of the optical signal carrying the service is switched from the main optical fiber channel to the standby optical fiber channel in the ready state.

Description

Ultra-low time delay fiber channel protection switching method and device Technical Field The application relates to the technical field of optical fiber communication, in particular to an ultralow-delay optical fiber channel protection switching method and device. Background In a high-speed optical fiber communication network, when a main optical fiber channel carrying a service fails, the main optical fiber channel needs to be quickly switched to a standby channel so as to ensure service continuity. The switching time delay is a core index for measuring the performance of the protection technology, and particularly for key services which are extremely sensitive to time delay, such as financial transactions, remote real-time control and the like, the interruption time is controlled to be in the millisecond or microsecond level. Currently, conventional protection switching schemes are typically generated by general-purpose processors executing fault detection, decision and switching instructions. The software processing mode has inherent processing time delay, and the decision threshold value is a fixed value, so that the software processing mode is difficult to adapt to dynamic fluctuation of network optical power. In addition, the mechanical action time of the conventional optical switch is long. Together, these factors result in the difficulty of further reduction of the overall end-to-end handoff delay, typically on the order of milliseconds, which cannot meet the increasingly stringent ultra-low latency traffic demands. Disclosure of Invention Based on this, it is necessary to provide an ultralow-delay optical fiber channel protection switching method and device capable of improving the optical fiber channel protection switching efficiency and reducing the total delay. In one aspect, the present application provides an ultralow latency fiber channel protection switching method, which includes: The optical power monitoring step is that optical signals of the main optical fiber channel and the standby optical fiber channel are sampled and subjected to photoelectric conversion treatment, and a main optical power sampling value and a standby optical power sampling value are generated; the fault judging step is that the real-time filtering and calculation are carried out on the received main optical power sampling value through a hardware accelerating circuit to obtain a main optical power real-time value, and the main optical power real-time value is compared with a dynamic first optical power threshold value, wherein the dynamic first optical power threshold value is dynamically calculated and generated based on the historical optical power statistical characteristics of the main optical fiber channel and a preset service priority coefficient; When the comparison operation result is that the real-time value of the main optical power is lower than the dynamic first optical power threshold value, generating and encoding a switching control signal in a single clock period through the hardware acceleration circuit, and outputting the switching control signal to the MEMS optical switch array in a high-speed differential electrical signal mode; And a channel switching step, wherein the MEMS optical switch array controls the state of an internal micro mirror array according to the switching control signal, and switches the physical route of the optical signal carrying the service from the main optical fiber channel to the standby optical fiber channel in a ready state. In one embodiment, in the optical power monitoring step, an optical splitter is used to couple the optical signal, and a photodetector is used to perform the photoelectric conversion process. In one embodiment, the hardware acceleration circuit is a field programmable gate array or an application specific integrated circuit. In one embodiment, the calculation and generation process of the dynamic first optical power threshold value includes: calculating a historical average power value and a power standard deviation based on the main optical power sampling value in the sliding time window; Inquiring a preset mapping table according to the service priority to obtain a corresponding weight factor; The dynamic first optical power threshold is calculated according to the following formula: Wherein, the For the dynamic first optical power threshold,For the said historical average power value(s),As a function of the standard deviation of the power,As a result of the weight factor(s),AndIs a preset adjustment coefficient. In one embodiment, before the optical power monitoring step, the method further comprises a pre-configuration step of controlling the MEMS optical switch array, connecting the physical path of the standby optical fiber channel to a service receiving end in advance, and activating the light source of the standby optical fiber channel to a low-power-consumption working state so that the standby optical fiber channel is in the ready state