CN106936510B

CN106936510B - Method for adjusting optical power, network equipment and network management equipment

Info

Publication number: CN106936510B
Application number: CN201511025524.7A
Authority: CN
Inventors: 刘鹏伟
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-12-30
Filing date: 2015-12-30
Publication date: 2020-10-09
Anticipated expiration: 2035-12-30
Also published as: CN106936510A

Abstract

The invention provides a method for adjusting optical power, network equipment and network management equipment. The method comprises the following steps: a first optical module of a first network device sends an optical signal to a second optical module of a second network device; the first network equipment receives an optical power adjusting parameter, wherein the optical power adjusting parameter is used for adjusting the output optical power of a first optical module of the first network equipment, and the optical power adjusting parameter depends on the input optical power of a second optical module of the second network equipment; the first network equipment determines the adjusting direction of the output optical power of the first optical module according to the optical power adjusting parameter; and the first network equipment adjusts the bias current of the first optical module according to the adjusting direction so as to adjust the output optical power of the first optical module. The technical scheme of the invention realizes the automatic adjustment of the optical power of the optical module.

Description

Method for adjusting optical power, network equipment and network management equipment

Technical Field

The present invention relates to the field of communications, and in particular, to a method for adjusting optical power, a network device, and a network management device.

Background

A communication network can be built with optical modules (optical modules) in conjunction with optical fibers. The optical module may be provided on the network device. The main function of the optical module is to realize photoelectric conversion and electro-optical conversion. The optical module installed at the transmitting end can convert the electrical signal into an optical signal, and the optical module installed at the receiving end can convert the optical signal into the electrical signal.

Due to aging of the optical module and the optical fiber over time in the operation process or due to environmental reasons, output optical power abnormality may occur in the optical module at the transmitting end, for example, the output optical power is too high or too low. For example, when the output optical power of the optical module at the transmitting end is abnormal, an Automatic Power Control (APC) circuit of the optical module at the transmitting end may adjust the bias current of the optical module at the transmitting end to adjust the output optical power of the optical module at the transmitting end, so as to restore the output optical power to normal. However, that the output optical power of the optical module at the transmitting end is normal does not mean that the input optical power of the optical module at the receiving end is also normal. When the input optical power of the optical module at the receiving end is abnormal, manual intervention is needed. For example, the input optical power of the optical module at the receiving end is recovered to normal by adjusting the optical fiber, increasing or decreasing the number of optical attenuators (optical attenuators) or replacing the optical module.

Disclosure of Invention

The application provides a method for adjusting optical power, network equipment and network management equipment, which can automatically adjust the optical power of an optical module.

In a first aspect, a method for adjusting optical power is provided, including: a first optical module of a first network device transmits an optical signal to a second optical module of a second network device, wherein the first optical module is connected to the second optical module by an optical fiber; the first network equipment receives an optical power adjusting parameter, wherein the optical power adjusting parameter is used for adjusting the output optical power of the first optical module, and the optical power adjusting parameter depends on the input optical power of the second optical module; the first network equipment determines the adjusting direction of the output optical power of the first optical module according to the optical power adjusting parameter; and the first network equipment adjusts the bias current of the first optical module according to the adjusting direction so as to adjust the output optical power of the first optical module. For example, the first optical module is connected to the second optical module with an optical fiber.

In the application, the first network device obtains an optical power adjustment parameter obtained based on input optical power of a second optical module of the second network device, determines an adjustment direction of output optical power of the first optical module according to the optical power adjustment parameter, and adjusts a bias current of the first optical module according to the adjustment direction to adjust the output optical power of the first optical module, so that the input optical power of the second optical module is adjusted, automatic adjustment of the optical power of the optical module is realized, the efficiency of adjusting the optical power is improved, and labor cost is saved.

With reference to the first aspect, in a first implementation of the first aspect, a first network device receives an optical power adjustment parameter, including: the first network device receives a first Simple Network Management Protocol (SNMP) message from the network management device, wherein the first SNMP message includes an optical power adjustment parameter, and the optical power adjustment parameter includes an adjustment direction, and the adjustment direction is determined by the network management device according to an intensity parameter of input optical power of the second optical module. The first network device can adjust the output optical power of the optical module by means of the SNMP message sent by the network management device, and the optical module does not need to receive the optical power adjustment parameter sent by the second network device, so that the influence on the optical module is reduced. In addition, because the SNMP is a standard simple network management protocol, the application adopts SNMP messages to transmit information, and can improve the compatibility among different manufacturers.

With reference to the first implementation of the first aspect, in a second implementation of the first aspect, the optical power adjustment parameter further includes an adjustment step size of a bias current, where the first network device adjusts the bias current of the first optical module according to an adjustment direction, and the method includes: the first network device adjusts the bias current of the first optical module according to the adjustment direction and the adjustment step length after receiving the first SNMP message, wherein the method of the first aspect further includes: the first network equipment receives a second SNMP message periodically sent by the network management equipment, wherein the second SNMP message is used for indicating the first network equipment to continuously adjust the bias current of the first optical module; and the first network equipment continues to adjust the bias current of the first optical module according to the adjusting direction and the adjusting step length after receiving the second SNMP message until the first network equipment does not receive the second SNMP message any more. The first network device may receive a second SNMP message periodically sent by the network management device, or may receive the second SNMP message sent by the network management device at different interval time periods. Because the first network device can gradually adjust the bias current of the optical module according to the adjustment step length, the first network device can more finely and stably adjust the output optical power of the optical module, so that the adjustment of the input optical power of the second network device is more finely and stably. In addition, the second SNMP message does not need to repeatedly carry the adjusting mode and the adjusting step length, so that the signaling overhead of the system is saved.

With reference to the first aspect and the first or second implementation of the first aspect, in a third implementation of the first aspect, the method further includes: the first network equipment determines that the output optical power of the first optical module is not in a normal range; and the first network equipment sends a response message to the network management equipment, and the response message is used for indicating the network management equipment to stop sending the second SNMP message. The first network device may instruct the network management device to stop sending the second SNMP message when the output optical power of the first optical module is not within a preset range (e.g., a normal range or a range smaller than the normal range), so that adjustment of the output optical power of the first network device can be stopped in time, and excessive adjustment of the output optical power of the first network device is avoided.

With reference to the first implementation of the first aspect, in a fourth implementation of the first aspect, the receiving, by a first network device, an optical power adjustment parameter includes: the method includes that a first network device receives a slow protocol message or a point-to-point protocol message periodically sent by a second network device through an optical fiber, the slow protocol message or the point-to-point protocol message includes an optical power adjustment parameter, the optical power adjustment parameter includes an intensity parameter of input optical power of a second optical module, and the first network device adjusts bias current of a first optical module according to an adjustment direction, and the method includes the following steps: and the first network equipment adjusts the bias current of the first optical module according to the adjustment direction and the preset adjustment step length of the bias current until the first network equipment determines to stop adjusting the bias current of the first optical module according to the adjustment direction. The first network equipment can directly receive the power adjusting parameters from the second network equipment, so that the adjusting frequency of the bias current of the first optical module is accelerated, the adjusting process of the output optical power of the first optical module and the input power of the second optical module is shortened, and the adjusting efficiency is improved.

With reference to the first aspect or any one of the first to fourth implementations of the first aspect, in a fifth possible implementation, a method for adjusting, by a first network device, a bias current of a first light module according to an adjustment direction includes: and the first network equipment adjusts the bias current of the first optical module according to the adjusting direction by utilizing the automatic control circuit of the first optical module.

In a second aspect, a method of adjusting optical power is provided, comprising: the network management equipment detects the intensity parameter of input optical power of a first optical module of first network equipment by using SNMP (simple network management protocol), wherein the first network equipment receives an optical signal output by a second optical module of second network equipment through the first optical module; the network management equipment determines the adjusting direction of the output light power of the second optical module according to the intensity parameter; the network management equipment sends a first SNMP message to the second network equipment, wherein the first SNMP message comprises an adjusting direction, so that the second network equipment can adjust the output optical power of the second optical module according to the adjusting direction. For example, the first optical module may receive an optical signal output by the second optical module through an optical fiber between the first optical module and the second optical module.

With reference to the second aspect, in a first implementation, the first SNMP message further includes an adjustment step size of the bias current, so that the second network device adjusts the bias current of the second optical module according to the adjustment direction and the adjustment step size after receiving the first SNMP message.

With reference to the second aspect or the first implementation of the second aspect, in a second implementation, the method of the second aspect further includes: and the network management equipment sends a second SNMP message to the second network equipment, wherein the second SNMP message is used for indicating whether to continuously adjust the bias current of the second optical module according to the adjusting direction.

With reference to the second aspect or the first or second implementation of the second aspect, in a third implementation, the method of the second aspect further includes: the network management equipment receives a response message sent by the second network equipment, wherein the response message is used for indicating the network management equipment to stop sending the second SNMP message; and the network management equipment stops sending the second SNMP message to the second network equipment.

In a third aspect, a network device is provided that comprises means for performing the method of the first aspect.

In a fourth aspect, there is provided a network management device comprising means for performing the method of the second aspect.

In a fifth aspect, a network device is provided, which includes: a first optical module for transmitting an optical signal to a second optical module of a second network device; the processor is configured to perform the method of the first aspect.

A sixth aspect provides a network management device, including: a communication interface for communicating with a first network device and a second network device. The processor is configured to perform the method of the second aspect.

In a seventh aspect, a computer-readable storage medium is provided for storing a program designed to execute the second aspect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic block diagram of a network device according to an embodiment of the present invention.

Fig. 2 is a schematic flow diagram of a method of adjusting optical power according to one embodiment of the present invention.

Fig. 3 is a schematic architecture diagram of a communication system according to an embodiment of the present invention.

Fig. 4 is a schematic flow diagram of a process of adjusting optical power of the embodiment of fig. 3.

Fig. 5 is a schematic diagram of an SNMP message according to an embodiment of the present invention.

Fig. 6 is a schematic diagram of an SNMP message according to another embodiment of the present invention.

Fig. 7 is a schematic diagram of an SNMP message according to another embodiment of the present invention.

Fig. 8 is an architectural diagram of a communication system according to another embodiment of the present invention.

Fig. 9 is a schematic flow diagram of a process of adjusting optical power of the embodiment of fig. 8.

Fig. 10 is a schematic diagram of a slow protocol packet according to an embodiment of the invention.

Fig. 11 is a schematic diagram of optical power adjustment parameters according to one embodiment of the present invention.

Fig. 12 is a diagram of a PPP message in accordance with one embodiment of the invention.

Fig. 13 is a schematic structural diagram of a network management apparatus according to an embodiment of the present invention.

Detailed Description

Fig. 1 is a schematic configuration diagram of a network device 100 of an embodiment of the present invention. Network device 100 includes at least one communication interface 110, a processor 120, and a memory 130. Wherein the at least one communication interface 110 may comprise a light module. The network device 100 is a transmitting-end network device, and the receiving-end network device receives optical signals output by the optical modules in the optical communication interface 110 through optical fibers between the optical modules in the optical communication interface 110 and the optical modules. Optionally, the network device 100 may further include at least one communication interface 130, and the communication interface 130 may be an electrical interface.

The memory 140 is used to store program codes. The processor 120 is connected to the communication interface 110, the communication interface 130 and the memory 140, wherein the program code comprises instructions which, when executed by the processor, cause the processor to perform the method performed by the network device in the embodiments of the invention described below. The processor may be connected to the light module via a bus. Optionally, the processor may also be connected to the optical module by a direct connection. The processor 120 receives the optical power adjustment parameter through the communication interface 130, or alternatively, the processor may receive the optical power adjustment parameter sent by another network device through the optical module in the communication interface 110. The processor may further determine an adjustment direction of output optical power of the optical module according to the optical power adjustment parameter, and adjust a bias current of the optical module according to the adjustment direction to adjust the output optical power of the optical module, where the optical power adjustment parameter depends on the input optical power of the optical module of the receiving-end network device.

According to the embodiment of the invention, the sending-end network equipment obtains the optical power adjustment parameter obtained based on the input optical power of the optical module of the receiving-end network equipment, determines the adjustment direction of the output optical power of the optical module of the sending-end network equipment according to the optical power adjustment parameter, and adjusts the bias current of the optical module of the sending-end network equipment according to the adjustment direction so as to adjust the output optical power of the optical module of the sending-end network equipment, thereby adjusting the input optical power of the optical module of the receiving-end network equipment, realizing the automatic adjustment of the optical power of the optical module, improving the efficiency of adjusting the optical power and saving the labor cost.

The optical module may be provided in the network device 100 for performing optical-electrical conversion and electrical-optical conversion. The optical module can be composed of an optoelectronic device, a functional circuit, an optical interface and the like. The optoelectronic device may include an emitting portion and a receiving portion. The functions of the transmitting part include: after the electrical signal input into the optical module is processed by an internal driving chip, an internal laser diode or light-emitting diode is driven to emit a modulated optical signal. The emitting part also carries the optical power APC inside. The optical power APC is used to stabilize the power of an optical signal (hereinafter referred to as optical power) output by the optical module. The functions of the receiving part of the optical module include: the modulated optical signal input to the optical module is converted into an electrical signal by the photodiode. The light module may also comprise only a transmitting part or a receiving part.

As shown in fig. 1, the light module includes a transmitting part, which may include a driving circuit 111, a light source 112, an APC113, and a light monitoring circuit 114, and a receiving part (not shown). The driving circuit 111 is used for driving the light source 112 to transmit an optical signal according to an input electrical signal, the light monitoring circuit 114 is used for measuring the current of the light source 120 of the optical module and supplying the measured current value to the APC113, and the APC113 adjusts the bias current of the optical module according to the current value so as to stabilize the output optical power of the optical module within a normal range.

The APC located inside the optical module at the transmitting end cannot sense the information of the optical module input optical power at the receiving end. Although the transmitting end can adjust the output optical power to be within the normal range by the APC, the input optical power at the receiving end may not be within the normal range. The embodiment of the invention provides a method for adjusting optical power and network equipment, wherein a sending end (for example, upstream network equipment) can automatically adjust the output optical power of an optical module at the sending end according to the information of the input optical power of the optical module at a receiving end (for example, downstream network equipment), so that the optical powers of the sending end and the receiving end are both in a normal range.

205, a first optical module of a first network device transmits an optical signal to a second optical module of a second network device. The second network device receives the optical signal output by the first optical module through the optical fiber between the second optical module and the first optical module.

And 210, the first network device receives an optical power adjustment parameter, wherein the optical power adjustment parameter is used for adjusting output optical power of a first optical module of the first network device, and the optical power adjustment parameter depends on input optical power of a second optical module of the second network device.

The first network device comprises a first optical module, the second network device comprises a second optical module, an optical signal sent by the first optical module is transmitted to the second optical module through an optical fiber between the first optical module and the second optical module, namely the first network device is used as an upstream device of the second network device. The optical power adjustment parameter received by the second network device is determined according to the input optical power of the second optical module of the second network device, and the optical power adjustment parameter may be an intensity parameter of the input optical power of the second optical module, for example, an intensity property or an optical power intensity value such as that the input optical power is too high, too low, or normal, or an adjustment direction of the output optical power of the first optical module determined according to the intensity parameter or the optical power intensity value of the input optical power of the second optical module. For example, when the input optical power of the second optical module is too high, the adjustment direction of the output power of the first optical module is determined to be downward adjustment, and when the input optical power of the second optical module is too low, the adjustment direction of the output power of the first optical module is determined to be upward adjustment. The first network device may obtain the optical power adjustment parameter from the second network device or the network management device.

220, the first network device determines an adjusting direction of the output optical power of the first optical module according to the optical power adjusting parameter.

When the optical power adjustment parameter includes the adjustment direction, the first network device may directly obtain the adjustment direction from the optical power adjustment parameter, and when the optical power adjustment parameter includes the intensity parameter of the input optical power of the second optical module, the first network device may first obtain the intensity parameter of the input optical power of the second optical module from the optical power adjustment parameter, and determine the adjustment direction according to the intensity parameter of the input optical power of the second optical module.

And 230, the first network device adjusts the bias current of the first light module according to the adjustment direction so as to adjust the output optical power of the first light module.

The bias current of the optical module is positively correlated (e.g., directly proportional) to the output power of the optical module, and therefore, the first network device can adjust the output optical power of the first optical module by adjusting the bias current. For example, if the adjustment direction is upward adjustment, the first network device may increase the bias current of the first optical module so as to increase the output power of the first optical module, thereby further increasing the input optical power of the second optical module, and if the adjustment direction is downward adjustment, the first network device may decrease the bias current of the first optical module so as to decrease the output power of the first optical module, thereby further decreasing the output optical power of the second optical module.

According to the embodiment of the invention, the first network device obtains the optical power adjustment parameter obtained based on the input optical power of the second optical module of the second network device, determines the adjustment direction of the output optical power of the first optical module according to the optical power adjustment parameter, and adjusts the bias current of the first optical module according to the adjustment direction to adjust the output optical power of the first optical module, so that the input optical power of the second optical module is adjusted, the automatic adjustment of the optical power of the optical module is realized, the efficiency of adjusting the optical power is improved, and the labor cost is saved.

For convenience of description, the embodiment of fig. 2 is described by taking the first optical module and the second optical module as an example, more than two network devices may exist in the communication system, each network device may include a plurality of interfaces, and each interface may be provided with one optical module.

The embodiment of the invention can adopt a Simple Network Management Protocol (SNMP) Protocol or a slow Protocol or a Point-to-Point Protocol (PPP) Protocol to realize the transmission of the power regulation parameters.

When the SNMP protocol is used to transmit the power adjustment parameter, in 210, the first network device receives a first simple network management protocol SNMP message from the network management device, where the first SNMP message includes an optical power adjustment parameter, and the optical power adjustment parameter includes an adjustment direction, where the adjustment direction is determined by the network management device according to an intensity parameter of input optical power of the second optical module.

Using SNMP, a network management device (e.g., a management workstation) can remotely manage network devices (or network elements) that support the protocol, including monitoring network status, modifying network device configuration, receiving network event alarms, etc. SNMP takes the special form of the client/server (English) model: the agent/management workstation model. The management and maintenance of the network are accomplished through the interaction between the management workstation and the SNMP agent. Each SNMP slave agent is responsible for responding to various queries by the SNMP Management workstation (master agent) about Management Information Base (MIB) definition Information. The MIB specifies variables maintained by the network device (i.e., information that can be queried and set by the management process). The MIB gives a data structure of a set of all possible managed objects in a network. The SNMP management information base has a tree structure similar to a Domain Name System (DNS). For example, the object {1.3.6.1.4.1} in the MIB is enterprises, and the number of nodes under the object exceeds 3000. Any company or organization in the world can obtain an end name by sending an e-mail to iana-mib @ isi. Thus, each manufacturer can define the managed object name of the product, so that the network equipment can be managed by using the SNMP.

The network management device may collect and record such management information in the MIB. The management information is used to report information such as device characteristics, data throughput, communication overload and failure. The MIB has a common format, so SNMP management tools from multiple vendors can collect MIB information. By embedding the SNMP into a data communication device, such as a network device like a router or a switch, the management of the network device by a network management device can be realized. A managed network device has a management agent that is responsible for requesting information and performing actions from the network management device and can also provide information to the network management device on its own initiative. According to the embodiment of the invention, in order to realize the adjustment of the output optical power of the first network device, a new MIB node may be added based on the SNMP protocol.

The network management device may monitor an intensity parameter of input optical power of a second optical module of the second network device through a GET operation in the SNMP message, for example, to indicate information such as that input optical power is too high, too low, normal, or no light. The GET operation may be implemented by any one of GET commands such as GetRequest, GetNextRequest getbulrequest, and the like. And the network management equipment determines the adjusting direction of the output optical power of the first network equipment according to the intensity parameter of the optical power. For example, in the case of periodically sending the optical power adjustment parameter, when the input optical power of the second optical module is too high, the network management device sets the adjustment direction to be adjusted downward, when the input optical power of the second optical module is too low or no light, the network management device sets the adjustment direction to be adjusted upward, and when the input optical power of the second optical module is normal, the network management device sets the adjustment direction to be unknown. In addition, the optical power adjustment parameter may be sent only when the optical power needs to be adjusted, so that the network management device may not send the optical power adjustment parameter under normal conditions. The network management device may notify the first network device of the optical power adjustment parameter through a SET operation in an SNMP message. Because the first network device can adjust the output optical power of the optical module by means of the SNMP message sent by the network management device, the optical module does not need to receive the optical power adjustment parameter sent by the second network device, and therefore the influence on the optical module is reduced. In addition, because the SNMP is a standard simple network management protocol, the embodiment of the invention adopts SNMP messages to transmit information, and can improve the compatibility among different manufacturers.

Optionally, as another embodiment, the method of the first aspect further includes: the first network device receives a second SNMP message periodically sent by the network management device, where the second SNMP message is used to instruct the first network device to continue to adjust the bias current of the first optical module, and the optical power adjustment parameter further includes an adjustment step size of the bias current, where in 230, the first network device adjusts the bias current of the first optical module according to the adjustment direction and the adjustment step size after receiving the first SNMP message, and continues to adjust the bias current of the first optical module according to the adjustment direction and the adjustment step size after receiving the second SNMP message until the first network device does not receive the second SNMP message any more.

The network management equipment can also set the adjustment step length of the bias current according to the intensity parameter of the optical power. The network management equipment can adopt different adjusting step lengths according to different levels of the intensity of the input optical power so as to improve the adjusting efficiency. For example, a first adjustment step is used when the intensity parameter of the optical power indicates that the input optical power is too low, and a second adjustment step is used when the intensity parameter of the optical power indicates no light, wherein the second adjustment step is larger than the first adjustment step. Alternatively, the network management device may also carry a preset adjustment step length in the optical power adjustment parameter, that is, a preset fixed step length is adopted, so as to simplify the design.

The network management device may notify the adjustment direction in the first SNMP message, and notify whether to continue adjusting the output optical power of the first optical module according to the adjustment direction in a second SNMP message sent at a later timing. The first network device may change the output optical power of the first optical module once according to the adjustment direction and the adjustment step length every time the second SNMP message is received once. The second SNMP message does not need to repeatedly carry the adjusting mode and the adjusting step length, so that the signaling overhead of the system is saved.

Alternatively, the network management device may also periodically send the first SNMP message to the first network device, and the first network device may change the output optical power of the first optical module once according to the adjustment direction and the adjustment step length each time the first SNMP message is received. Such a scheme can be implemented by simply sending an SNMP message to the first network device, making the design of the system simple.

Optionally, as another embodiment, the method of fig. 2 further includes: the first network equipment determines that the output optical power of the first optical module is not in a normal range; and the first network equipment sends a response message to the network management equipment, and the response message is used for indicating the network management equipment to stop sending the second SNMP message.

When the output optical power of the first optical module needs to be maintained within a preset range (for example, within a normal range or within a range smaller than the normal range, if the output optical power of the first optical module exceeds the preset range in the adjustment process, the first network device sends a response message to the network management device, so that the network management device does not send a second SNMP message to the first network device any more, thereby ensuring that the output optical power of the first optical module is maintained within the preset range.

Alternatively, as another embodiment, when the power adjustment parameter is transmitted by using a slow protocol or a point-to-point protocol, in 210, the first network device receives a slow protocol message or a point-to-point protocol message periodically transmitted by the second network device through the optical fiber, where the slow protocol message or the point-to-point protocol message includes an optical power adjustment parameter, and the optical power adjustment parameter includes an intensity parameter of input optical power of the second optical module, and in 230, the first network device adjusts the bias current of the first optical module according to the adjustment direction and the preset adjustment step size of the bias current.

The second network device may periodically query the intensity parameter of the input optical power of an optical module after detecting that the input optical power of the optical module of a certain interface is abnormal, encapsulate the equal intensity parameter with too low or too high input optical power in a slow protocol message or a point-to-point protocol message, and periodically send the equal intensity parameter to a corresponding interface of the second network device located upstream. For example, the intensity parameter of the input optical power includes at least one of too high, too low, normal, and no light.

In 230, the first network device adjusts a bias current of the first light module according to the adjustment direction using an APC function of the first light module.

For example, the APC of the optical module is generally used to adjust the bias current of the laser diode of the optical module according to the monitored current of the laser diode to maintain the output optical power stable. According to an embodiment of the present invention, the first network device further changes the bias current of the first optical module by the variable APC upon receiving the above-mentioned optical power adjustment parameter, for example, adjusts the bias current of the laser diode of the first optical module, thereby adjusting the output optical power of the first optical module.

Optionally, as another embodiment, the method of fig. 2 further includes: the first network equipment determines that the output optical power of the first optical module is not in a normal range; the first network device stops adjusting the bias current of the first light module according to the adjustment direction.

As described above, the network device may generally adjust the output optical power of the optical module within the preset range through the APC function, and in this case, if the first network device finds that the output optical power of the first optical module exceeds the preset range after adjusting the bias current of the first optical module according to the adjustment direction and the adjustment step length, the adjustment of the bias current of the first optical module according to the adjustment direction and the adjustment step length is stopped. Meanwhile, the first network device may send a response message to the network management device to indicate that the network management device does not send the optical power adjustment parameter any more.

Embodiments of the present invention are described in more detail below with reference to specific examples. Fig. 3 is a schematic architecture diagram of a communication system 300 according to an embodiment of the present invention. The communication system of fig. 3 is used to implement the method of fig. 2.

The communication system 300 includes: network device 310, network device 320, and network management device 330. The network device 310 includes an optical module 311 and the network device 320 includes an optical module 321. For example, network device 310 or network device 320 may be a network device such as a switch or router. The optical module 321 is located at the interface 322 of the network device 320, and the optical module 311 is located at the interface 312 of the network device 310. The interface 322 is connected to the interface 312 via an optical fiber 340. The network management device 330 is used for monitoring and managing network devices in the communication system. The network management device 330 stores network topology information, for example, stores a correspondence between interfaces of the network device. It should be understood that each network device may be provided with multiple interfaces. Two network devices communicate through optical fibers connected between paired interfaces.

The method comprises the steps that network management equipment monitors the input optical power condition of optical modules of various interfaces of downstream network equipment, when an alarm that the input optical power of an optical module of a certain interface is too low or too high is detected, the network management equipment finds upstream network equipment corresponding to the interface where the optical module is located and the corresponding interface according to network topology information (stored in the network management equipment), and informs the upstream equipment to adjust the output optical power of the upstream network equipment by adjusting the bias current of the optical module located at the interface, so that the input optical power of the optical module of the downstream network equipment is restored to a normal range, and an optical link is restored to be normal.

The present embodiment takes the network device 320 as a downstream network device of the network device 310 as an example for explanation. Network device 310 and network device 320 correspond to the first network device and the second network device, respectively, in the embodiment of fig. 2. The interface 312 of the network device 310 is connected to the interface 322 of the network device 320 via optical fibers. The communication between the network management device and the network device may be based on a network management protocol, such as SNMP.

410, the network management device 330 detects the input optical power strength parameter reported by the network device 320.

The intensity parameter of the input optical power may refer to alarm information of the input optical power, and the network management device may detect whether there is an input optical power abnormality in each network device in the managed network through a polling method of an SNMP or an interrupt-based method, for example, the network management device may obtain information such as an alarm type and an alarm parameter from the alarm information sent by the network device 320. The alarm types include: for example, a local function failure alarm of the optical module, etc. The alarm information may indicate different alarm parameters by an error coding field, where different codes indicate different alarm reasons, for example, an error coding may indicate that input optical power is too low, input optical power is too high, output optical power is too low, and output optical power is too high.

420, the network management device 330 queries the upstream network device 310 corresponding to the network device 320 according to the stored network topology information.

The network topology information stores the corresponding relationship between the interface of the downstream network device and the interface of the upstream network device, for example, the network management device 330 may learn that the interface 322 of the network device 320 corresponds to the interface 312 of the upstream network device 310 by querying the network topology information.

430, the network management device 330 determines the adjustment direction of the output optical power of the network device 310 according to the intensity parameter of the input optical power reported by the network device 320.

The network management device 330 may determine the adjustment direction of the output optical power of the network device 310 according to the alarm type and the alarm parameter. For example, when the alarm information indicates that the input optical power of the network device 320 is too high, the network management device determines that the adjustment direction is downward adjustment, and when the alarm information indicates that the input optical power of the network device 320 is too low, the network management device 330 determines that the adjustment direction is upward adjustment.

440, the network management device 330 sends a first SNMP message to the network device 310, for instructing the network device 310 to adjust the output optical power of the optical module.

For example, the network management device may notify the network device 310 to adjust the output optical power of the optical module located in the interface 312 through the SET operation of the SNMP message. For example, the network management device may notify the network device 310 of the adjustment direction and the configured adjustment step size. Wherein the adjustment step size is optional. Alternatively, the adjustment step size may be agreed in advance on the network management device 330 and the network device 310, in which case the network management device does not need to notify the network device 310 of the adjustment step size.

The adjustment of the input optical power can be realized by adding an MIB node, and the key information (or fields) included in the MIB node definition are shown in fig. 5, fig. 6 and fig. 7, where fig. 5 is a schematic diagram of an SNMP message according to an embodiment of the present invention, and fig. 6 is a schematic diagram of an SNMP message according to another embodiment of the present invention. Fig. 7 is a schematic diagram of an SNM message according to another embodiment of the present invention.

As shown in fig. 5, the first SNMP message may carry an adjustment direction (hwentityoptical txadjustdirection) for indicating an adjustment step size of output optical power of an optical module of the network device 310. When the value of the adjustment direction is 0, it means that the adjustment direction is UNKNOWN (UNKNOWN), i.e. no adjustment is required. An adjustment direction value carried by an SNMP message is 1, indicating an UP (UP) adjustment, and an adjustment direction value carried by an SNMP message is 2, indicating a DOWN (DOWN) adjustment. As shown in fig. 6, the SNMP message may also carry an adjustment step size (hwentityoptical txadjust step) for indicating the adjustment step size of the output optical power of the optical module of the network device 310.

450, the network device 310 receives the first SNMP message and adjusts the output optical power of the optical module of the network device 310 according to the first SNMP message.

Since the bias current of the laser diode of the optical module is positively correlated with the output optical power of the optical module, the output optical power of the optical module can be adjusted by adjusting the increment value or the decrement value at the time of adjusting the bias current. For example, the network device 310 may adjust the bias current of the optical module by adjusting the size of the digital potentiometer, so as to achieve the purpose of adjusting the output optical power of the optical module.

The network device 310 may obtain the adjustment direction and the adjustment step included in the SNMP message, and adjust the bias current of the optical module according to the adjustment direction and the adjustment step, so as to adjust the output optical power of the optical module. For example, when the value of the adjustment direction is 1, the bias current is adjusted upward by the size indicated by the adjustment step according to the adjustment step, when the value of the adjustment direction is 2, the bias current is adjusted downward by the size indicated by the adjustment step, and when the value of the adjustment direction is 0, the adjustment of the output optical power of the optical module according to the adjustment direction and the adjustment step is stopped.

460, the network management device 330 may periodically send a second SNMP message to the network device 310 for indicating whether to continue adjusting the output optical power of the optical module of the network device 310.

For example, the network management device may notify the network device 310 to continue adjusting the output optical power of the optical module of the interface 312 through the SET operation of the second SNMP message.

As shown in fig. 7, the SNMP message may carry an adjustment status (hwenergy optical format adjust status), where a value of the adjustment status is 0, which indicates that the adjustment of the output optical power of the optical module according to the adjustment direction and the adjustment step length is stopped, and a value of the adjustment status is 1, which indicates that the adjustment of the output optical power of the optical module according to the adjustment direction and the adjustment step length is continued.

470, the network management device 330 can continue to adjust the output optical power of the optical module of the network device 310.

If the second SNMP message indicates to continue adjusting the output optical power of the optical module of the network device 310, the network management device may continue adjusting the output optical power of the optical module of the network device 310.

480, the network device 310 may return a response message to the network management device.

For example, if the network device 310 still does not receive the second SNMP message after the predetermined time expires, or finds that the output optical power of the optical module of the network device 310 is not within the normal range after adjusting the output optical power, then a response message is returned to the network management device 330. For example, when the output optical power of the optical module is adjusted, if the output optical power of the adjusted optical module exceeds the normal range value, the network management device 330 is notified of the optical power adjustment failure through the response message, and after the network management device 330 knows that the optical power adjustment failure occurs, the network management device 330 stops sending the second SNMP message to the network device 310. Optionally, if the network device receives a second SNMP message when detecting that the output optical power of the optical module exceeds the normal range value, the network device stops performing optical power adjustment according to the second SNMP message.

Optionally, when the interface 312 of the network device 310 does not support output optical power adjustment, a response message is returned to the network management device when receiving the first SNMP message notified by the network management device to notify that optical power adjustment of the network management device fails, and the network management device stops sending the second SNMP message to the network device 310 after learning that optical power adjustment fails.

Optionally, as another embodiment, an embodiment of the present invention may further provide a command line interface on the network device 310, for manually controlling the adjustment of the output optical power of the optical module through the command line interface.

480, the network management device may stop sending the second SNMP message to the network device 310 after receiving the response message returned by the network device 310.

Optionally, the network management device may further stop sending the second SNMP message to the network device 310 after detecting that the alarm of the input optical power abnormality reported by the network device 320 is eliminated.

It should be understood that the execution order of 420 and 430 is not limited by the embodiments of the present invention, and 430 may be executed before 420, or both may be executed simultaneously.

Fig. 8 is an architectural diagram of a communication system 800 according to another embodiment of the present invention.

The communication system 800 includes: network device 810, and network device 820. Network device 810 includes optical module 811 and network device 820 includes optical module 821. For example, the network device may be a network device such as a switch or router. Optical module 821 is located at interface 822 of network device 820 and optical module 811 is located at interface 812 of network device 810. Interface 822 and interface 812 are connected by optical fiber 840. It should be understood that each network device may be provided with multiple interfaces. Two network devices communicate through optical fibers connected between paired interfaces.

The upstream network device may monitor (e.g., periodically detect) an input optical power of an optical module located at a corresponding interface of the downstream network device, and when it is detected that the input optical power of the optical module located at the corresponding interface of the downstream network device is too low or too high, the upstream network device adjusts an output optical power of the upstream network device by adjusting a bias current of the optical module until the input optical power of the optical module of the downstream network device returns to a normal range, so as to return an optical link to a normal state.

The present embodiment takes network device 820 as a downstream network device of network device 810 as an example for explanation. In this embodiment, the optical power adjustment parameters are carried between network device 820 and network device 810 via a slow protocol message or a point-to-point protocol message.

The network device 820 may detect the intensity of the input optical power of the optical module 910 and determine an intensity parameter of the input optical power for indicating the status of the intensity of the input optical power, e.g., too high or too low.

For example, the network device 820 may periodically detect whether the input optical power of the optical module of the interface 822 is abnormal, and determine an intensity parameter such as an intensity of the input optical power being too high or too low.

920, the network device 820 sends a slow protocol packet or PPP packet to the network device 810, and the intensity parameter of the input optical power of the optical module of the network device 820 is carried as an optical power adjustment parameter.

The network device may encapsulate the strength parameter with too low or too high input optical power as an alarm message in a slow protocol packet or PPP packet, and periodically send the alarm message to the interface 812 of the network device 810. For example, when interface 822 of network device 820 and interface 812 of network device 810 are ethernet interfaces, network device 820 may encapsulate the alarm information in a slow protocol messaging format, as shown in fig. 10 and 11. Fig. 10 is a schematic diagram of a slow protocol packet according to an embodiment of the present invention. Fig. 11 is a schematic diagram of optical power adjustment parameters according to an embodiment of the present invention. Fig. 12 is a diagram illustrating a PPP message according to an embodiment of the invention.

When the interface of the network device 820 and the interface 812 of the network device 810 are Synchronous Digital Hierarchy (SDH) interfaces, the network device 820 may package the alarm information in a PPP message format, as shown in fig. 11 and 12.

Referring to fig. 10, the DA field is a reserved multicast destination Media Access Control (MAC) address, which is typically 6 bytes and may have a value of 01-80-C2-00-00-02; the SA field represents the MAC address of the source port, typically 6 bytes; the Type field is fixed to be 0x8809 and represents a slow protocol message; the SubType is used for distinguishing different slow protocol messages, and the messages are usually 1 byte; SubType ═ 0xFF denotes an optical power adjustment message; the Flag field is typically 4 bytes, which may have a value of 0XFEFE 0002; the Information field carries specific message contents to be sent, which are usually 8 bytes, and for the optical power adjustment message, the optical power-like strength parameter of the network device 820 is placed in the field, and the meaning of each byte of the field is as shown in fig. 11; the Cyclic Redundancy Check (CRC) field represents CRC Check information, typically 4 bytes.

Referring to fig. 11, the Type field in fig. 11 is a specific message Type, and usually has 1 byte, and the value of the Type field may be 0x 01; the Version field is a Version number, typically 1 byte, which may have a value of 0x 01; the Length byte is a Length, typically 2 bytes, and may have a value of 0x 0004; the Power field is an optical Power intensity state, typically 1 byte, and has a value of 0x0 indicating that the optical Power intensity state is normal, a value of 0x1 indicating that the optical Power intensity state is too high, a value of 0x2 indicating that the optical Power intensity state is too low, a value of 0x3 indicating that the optical Power intensity state is no light, padding is a padding field, typically 3 bytes, and may have a value of 0x 000000.

Referring to fig. 12, the Flag field in fig. 12 is the start and end flags of the PPP data frame, typically 1 byte, and may have a value of 0x7 e; the Address field is an Address field, typically 1 byte, and may have a value of 0 xff; the Control field is a Control field, typically 1 byte, and may have a value of 0x 03; the Protocol field indicates the Protocol type, typically 2 bytes, which may have a value of 0xce 05; the Type field is used to distinguish a specific message Type, and usually has 20 bytes, for the optical Power adjustment message, the Type may be ("Light Power Search"), the Information field carries specific message content to be sent, and usually has 8 bytes, for the optical Power adjustment message, the input Power state of the network device 820 is placed in the field, and the meaning of each byte of the word is as shown in fig. 11; the Frame Check Sequence (FCS) field indicates FCS Check information, and is typically 2 bytes.

930, after receiving the slow protocol packet or the PPP packet, the network device 810 determines an adjustment direction and an adjustment step length of the optical power according to the intensity parameter of the optical power.

After receiving the slow protocol packet or the PPP packet sent by the interface 822 of the network device 820, the interface 812 of the network device 810 extracts the alarm information from the slow protocol packet or the PPP packet, and determines the adjustment direction and the adjustment step length of the output optical power.

940, the network device 810 adjusts the bias current of the optical module according to the adjustment direction and the adjustment step length until the interface 812 of the network device 810 cannot receive the slow protocol packet or the PPP packet periodically sent by the network device 810, or the output optical power of the optical module after the output optical power is adjusted is not within the normal range.

Optionally, the network device 820 stops sending the slow protocol packet or the PPP packet to the network device 810 after the input optical power of the optical module returns to normal.

The interface 822 of the network device 820 stops sending the slow protocol packet or PPP packet to the network device 810 after detecting that the input optical power returns to normal.

Optionally, when adjusting the output optical power of the optical module, if the adjusted output optical power of the optical module is not in the normal range, the network device 810 stops adjusting the output optical power of the optical module.

Alternatively, interface 812 of network device 810 does not respond to slow protocol messages or PPP messages sent by network device 820 when output optical power adjustment is not supported.

Optionally, as another embodiment, an embodiment of the present invention may further provide a command line interface on the network device 810, for manually controlling the adjustment of the output optical power of the optical module through the command line interface.

The method for adjusting optical power according to the embodiment of the present invention is described above, and the network device and the network management device according to the embodiment of the present invention are described below.

According to another embodiment of the present invention, a network device is provided. The network device comprises means for performing the method performed by the network device in the above embodiments.

According to another embodiment of the present invention, there is provided a network management apparatus. The network management device comprises means for performing the method performed by the network management device in the above embodiment.

Fig. 13 is a schematic structural diagram of a network management device 1300 according to another embodiment of the present invention. The network management device 1300 includes a processor 1310, a memory 1320, and a communication interface 1330.

The memory 1320 is used to store instructions. Processor 1310 is configured to execute instructions and communication interface 1330 is configured to communicate with network devices under the control of processor 1310. The instructions, when executed by the processor, cause the processor to perform the method performed by the network management device in the above embodiments.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be an electric or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on this understanding, the technical solution or parts of the technical solution of the present invention can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a processor to execute all or part of the steps of the method according to the embodiments of the present invention. The processor may be a Central Processing Unit (CPU) or a network processor. And the aforementioned storage medium includes: various media capable of storing program codes, such as a flash memory (english: flash memory), a portable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, and an optical disk.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method of adjusting optical power, comprising:

a first optical module of a first network device sends an optical signal to a second optical module of a second network device;

the first network device receives an optical power adjustment parameter, where the optical power adjustment parameter includes an intensity parameter and/or an adjustment direction of output optical power of the first optical module, where the optical power adjustment parameter is used to adjust the output optical power of the first optical module, and the optical power adjustment parameter depends on input optical power of the second optical module;

the first network equipment determines the adjusting direction according to the optical power adjusting parameter;

and the first network equipment adjusts the bias current of the first optical module according to the adjusting direction so as to adjust the output optical power of the first optical module.

2. The method of claim 1, wherein the first network device receives an optical power adjustment parameter, comprising:

the first network device receives a first Simple Network Management Protocol (SNMP) message from a network management device, wherein the first SNMP message comprises the optical power adjustment parameter, and the optical power adjustment parameter comprises the adjustment direction, and the adjustment direction is determined by the network management device according to the intensity parameter of the input optical power of the second optical module.

3. The method of claim 2,

the optical power adjustment parameter further includes an adjustment step size of the bias current, where the first network device adjusts the bias current of the first optical module according to the adjustment direction, and includes:

the first network device adjusts the bias current of the first optical module according to the adjustment direction and the adjustment step length after receiving the first SNMP message,

wherein the method further comprises:

the first network device receives a second SNMP message sent by the network management device, wherein the second SNMP message is used for indicating the first network device to continuously adjust the bias current of the first optical module;

and after receiving the second SNMP message, the first network equipment continues to adjust the bias current of the first optical module according to the adjustment direction and the adjustment step length until the first network equipment does not receive the second SNMP message any more.

4. A method of adjusting optical power, comprising:

network management equipment detects an intensity parameter of input optical power of a first optical module of first network equipment by using a Simple Network Management Protocol (SNMP), wherein the first network equipment receives an optical signal output by a second optical module of second network equipment through the first optical module;

the network management equipment determines the adjusting direction of the output optical power of the second optical module according to the intensity parameter;

and the network management equipment sends a first SNMP message to the second network equipment, wherein the first SNMP message comprises the adjusting direction, so that the second network equipment can adjust the output optical power of the second optical module according to the adjusting direction.

5. A network device, comprising:

a first optical module for transmitting an optical signal to a second optical module of a second network device;

a receiving module, configured to receive an optical power adjustment parameter, where the optical power adjustment parameter includes an intensity parameter and/or an adjustment direction of output optical power of the first optical module, where the optical power adjustment parameter is used to adjust the output optical power of the first optical module, and the optical power adjustment parameter depends on input optical power of the second optical module;

the determining module is used for determining the adjusting direction according to the optical power adjusting parameters;

and the adjusting module is used for indicating the first optical module to adjust the bias current of the first optical module according to the adjusting direction so as to adjust the output optical power of the first optical module.

6. The network device according to claim 5, wherein the receiving module receives a first Simple Network Management Protocol (SNMP) message from a network management device, the first SNMP message including the optical power adjustment parameter, the optical power adjustment parameter including the adjustment direction, and wherein the adjustment direction is determined by the network management device according to an intensity parameter of input optical power of the second optical module.

7. The network device of claim 6,

the optical power adjustment parameter further includes an adjustment step size of the bias current, the adjustment module instructs the first optical module to adjust the bias current of the first optical module according to the adjustment direction and the adjustment step size after the reception module receives the first SNMP message, the reception module further receives a second SNMP message sent by the network management device, the adjustment module continues to instruct the first optical module to adjust the bias current of the first optical module according to the adjustment direction and the adjustment step size after the reception module receives the second SNMP message until the network device does not receive the second SNMP message any more, and the second SNMP message is used for instructing the network device to continue to adjust the bias current of the first optical module.

8. A network management device, comprising:

the detection module is used for detecting an intensity parameter of input optical power of a first optical module of first network equipment by using a Simple Network Management Protocol (SNMP), wherein the first network equipment receives an output optical signal of a second optical module of second network equipment through the first optical module;

the determining module is used for determining the adjusting direction of the output optical power of the second optical module according to the intensity parameter;

a sending module, configured to send a first SNMP message to the second network device, where the first SNMP message includes the adjustment direction and is used to adjust output optical power of the second optical module.

9. A network device, comprising:

a processor to: receiving an optical power adjustment parameter, where the optical power adjustment parameter includes an intensity parameter and/or an adjustment direction of output optical power of the first optical module, where the optical power adjustment parameter is used to adjust the output optical power of the first optical module, and the optical power adjustment parameter depends on input optical power of a second optical module of the second network device;

and determining the adjusting direction according to the optical power adjusting parameter, and instructing the first optical module to adjust the bias current of the first optical module according to the adjusting direction so as to adjust the output optical power of the first optical module.

10. The network device of claim 9, wherein the processor further receives a first Simple Network Management Protocol (SNMP) message from a network management device, wherein the first SNMP message comprises the optical power adjustment parameter, wherein the optical power adjustment parameter comprises the adjustment direction, and wherein the adjustment direction is determined by the network management device according to an intensity parameter of input optical power of the second optical module.

11. The network device of claim 10, wherein the optical power adjustment parameter further comprises an adjustment step size of the bias current,

the processor is further configured to receive a second SNMP message sent by the network management device, where the second SNMP message is used to instruct the network device to continue adjusting the bias current of the first optical module, and the processor instructs the first optical module to continue adjusting the bias current of the first optical module according to the adjustment direction and the adjustment step length after receiving the second SNMP message until the network device does not receive the second SNMP message any more.

12. A network management device, comprising:

a communication interface for communicating with a first network device and a second network device;

a processor to:

detecting an intensity parameter of input optical power of a first optical module of the first network equipment through the communication interface by using a Simple Network Management Protocol (SNMP); and configured to determine, according to the intensity parameter, an adjustment direction of output optical power of a second optical module of the second network device, where the first optical module receives an optical signal sent by the second optical module;

and sending a first SNMP message to the second network device through the communication interface, wherein the first SNMP message comprises the adjusting direction and is used for adjusting the output optical power of the second optical module.