CN113497651B

CN113497651B - Method for calibrating insertion loss and related equipment

Info

Publication number: CN113497651B
Application number: CN202010192717.6A
Authority: CN
Inventors: 朱飞; 范明惠
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-03-18
Filing date: 2020-03-18
Publication date: 2022-10-04
Anticipated expiration: 2040-03-18
Also published as: CN113497651A; WO2021185066A1

Abstract

The embodiment of the invention discloses a method for calibrating insertion loss and related equipment. The efficiency and the accuracy of calibrating the insertion loss can be effectively improved. The method comprises the following steps: obtaining an input power value and an output power value of a calibration optical signal, where the input power value is a power value of the calibration optical signal obtained at an input port of a network device, the output power value is a power value of the calibration optical signal obtained at an output port of the network device, and the calibration optical signal is an optical signal not carrying a service; and acquiring insertion loss according to the input power value and the output power value, wherein the insertion loss is the power loss generated between the input port and the output port.

Description

Method for calibrating insertion loss and related equipment

Technical Field

The present invention relates to the field of optical fiber communications, and in particular, to a method for calibrating insertion loss and related devices.

Background

When an optical signal is transmitted in a Reconfigurable Optical Add Drop Multiplexer (ROADM), an attenuation value of a Wavelength Selective Switch (WSS) needs to be adjusted in the ROADM, so that the adjustment of the power of the optical signal output from the ROADM is realized.

In the process of ROADM transmission, power loss is caused to the power of an optical signal by optical fibers, devices and the like in the ROADM, and the power loss is hedged by adjusting the attenuation value of the WSS. In the prior art, the specific value of the power loss is a parameter set by a factory.

Because the power losses generated by the ROADM during the transmission process of the optical signals with different wavelengths are different, and the power losses generated by the ROADM for the optical signals transmitted along different transmission paths are also different, the factory-set power loss cannot accurately distinguish the optical signals with different wavelengths from the actual power losses of the optical signals transmitted along different transmission paths, and thus, the power loss obtained by the prior art is inaccurate.

Disclosure of Invention

The invention provides a method for calibrating insertion loss and related equipment, which can effectively improve the accuracy and efficiency of the acquired insertion loss.

In a first aspect, the present application provides a method for calibrating insertion loss, the method comprising: the network device obtains an input power value and an output power value of a calibration optical signal, wherein the input power value is the power value of the calibration optical signal obtained at an input port of the network device, the output power value is the power value of the calibration optical signal obtained at an output port of the network device, and the calibration optical signal is an optical signal not carrying a service; the network device obtains an insertion loss according to the input power value and the output power value, wherein the insertion loss is a power loss generated between the input port and the output port. The network device may be a control plane of an optical network device or a network management device.

The method for calibrating the insertion loss can accurately distinguish the calibration optical signals with different wavelengths and the calibration optical signals transmitted along different transmission paths in the network equipment, and effectively improves the accuracy of determining the insertion loss of the calibration optical signals due to the insertion loss in the network equipment. The accurate adjustment of the output power of the service optical signal can be effectively realized based on the accurate insertion loss.

In a possible implementation, after the network device obtains the insertion loss according to the input power value and the output power value, the method further includes: the network device obtains a target attenuation value according to the insertion loss, and the target attenuation value is used for adjusting a target power value output by the optical signal from the output port.

It can be seen that the target attenuation value may be an attenuation value between transmission of the service optical signal or the calibration optical signal from the input port to the output port. Based on the insertion loss obtained from the calibration optical signal, the insertion loss of the service optical signal having the same wavelength as the calibration optical signal can be obtained. The network device can directly adjust the target attenuation value according to the insertion loss, so that the service optical signal can be output from the output port at the target power value. The target power value output from the output port of the service optical signal is adjusted based on the insertion loss of the calibration optical signal, and the accuracy and the efficiency of power adjustment are improved.

In one possible embodiment, the calibration optical signal is from an upstream network device, such that the calibration optical signal is transmitted from the input port to the output port.

It can be seen that, the network device may perform calibration of insertion loss based on a calibration optical signal received from an upstream network, and in order to implement accurate calibration of insertion loss, the calibration optical signal needs to be transmitted from an input port to an output port of the network device, so that the network device can accurately obtain insertion loss generated between the input port and the output port.

In one possible embodiment, the calibration optical signal is generated by the network device.

In one possible implementation, the network device obtaining the insertion loss according to the input power value and the output power value includes: the network equipment acquires an initial attenuation value, wherein the initial attenuation value is an attenuation value in a state that the output power value is acquired on the output port; the network device determines that the insertion loss is equal to a difference between a first power difference and the initial attenuation value, the first power difference being a difference between the input power value and the output power value.

In one possible embodiment, the network device obtaining the target attenuation value according to the insertion loss includes: the network device obtains the target attenuation value, where the target attenuation value is a difference between a second power difference and the insertion loss, and the second power difference is a difference between the input power value and the target power value.

Therefore, the network device obtains the target attenuation value based on the insertion loss, and the service data can be output from the output port of the network device at the target power value based on the target attenuation value, so that the accurate adjustment of the output power value of the service data is effectively realized.

In one possible embodiment, the method further comprises: the network device blocks transmission of a local optical signal, where a wavelength of the local optical signal is equal to a wavelength of the calibration optical signal, and the local optical signal is an optical signal that does not carry a service and is generated by the network device.

Therefore, before the network device transmits the calibration optical signal, the local optical signal having the same wavelength and the same transmission path as the calibration optical signal needs to be blocked, so that the calibration optical signal is transmitted in the network device, and collision between the local optical signal having the same wavelength and the calibration optical signal is avoided.

In a possible implementation, after the network device obtains the target attenuation value according to the insertion loss, the method further includes: the network device blocks the transmission of the calibration optical signal, the wavelength of the calibration optical signal is equal to the wavelength of the service optical signal, and the power of the service optical signal on the output port is the target power value.

It can be seen that, when the network device acquires the service optical signal, the calibration optical signal that is transmitted along the same path and has the same wavelength as the service optical signal in the network device is blocked, so that the network device can only acquire the output power value of the service optical signal at the output port, thereby avoiding the conflict between the service optical signal and the calibration optical signal at the output port, and the network device can adjust the output power value of the service optical signal to the target power value based on the insertion loss of the calibration optical signal, thereby achieving the purpose of accurately adjusting the output power value of the service optical signal, and effectively improving the efficiency of adjusting the output power value of the service optical signal.

In one possible embodiment, the method further comprises: the network equipment sends a request message to upstream network equipment, wherein the request message is used for requesting to confirm whether the upstream network equipment has the capability of sending the calibration optical signal; the network device receives an indication message from the upstream network device, where the indication message is used to indicate that the upstream network device has the capability of sending the calibration optical signal.

Therefore, the network device executes the procedure of calibrating the insertion loss only when determining that the upstream network device has the capability of sending the calibration optical signal, and the success rate of calibrating the insertion loss of the network device is effectively improved.

In a possible implementation, before the network device obtains the input power value and the output power value of the calibration optical signal, the method further includes: if the modulation mode of the optical signal from the upstream network device is the target modulation mode, determining that the optical signal is the calibration optical signal, and the target modulation mode is the modulation mode corresponding to the calibration optical signal.

Therefore, the network device can accurately distinguish whether the received optical signal is a calibration optical signal or a service optical signal through a target modulation mode.

In one possible embodiment, the method further comprises: the network equipment adjusts the attenuation value corresponding to the calibration optical signal to the maximum value; the network device gradually reduces the attenuation value corresponding to the calibration optical signal until the output power value is obtained at the output port.

Therefore, the network device effectively reduces the influence of the calibration optical signal transmitted by the network device on the transmission of the service optical signal by adjusting the attenuation value of the calibration optical signal to be maximum and then gradually reducing the attenuation value until the output power value is detected on the output port.

In a possible implementation, the input port is any one of a plurality of input ports of the network device, and the output port is any one of a plurality of output ports of the network device.

Therefore, the network device can calibrate the insertion loss of the calibrated optical signal in the process of transmitting along any transmission path in the network device, and different transmission paths refer to combinations between different input ports and different output ports of the network device.

In a second aspect, the present application provides a network device, comprising: an obtaining unit, configured to obtain an input power value and an output power value of a calibration optical signal, where the input power value is a power value of the calibration optical signal obtained at an input port of a network device, the output power value is a power value of the calibration optical signal obtained at an output port of the network device, and the calibration optical signal is an optical signal that does not carry a service; and the processing unit is used for acquiring insertion loss according to the input power value and the output power value, wherein the insertion loss is the power loss generated between the input port and the output port. For the description of the beneficial effects of the present invention, please refer to the description of the first aspect, which is not repeated herein.

In a possible implementation, the processing unit is further configured to: and acquiring a target attenuation value according to the insertion loss, wherein the target attenuation value is used for adjusting the target power value output by the optical signal from the output port.

In one possible embodiment, the calibration optical signal is from an upstream network device, so that the calibration optical signal is transmitted from the input port to the output port.

In a possible implementation, the processing unit is specifically configured to: acquiring an initial attenuation value, wherein the initial attenuation value is the attenuation value in the state that the output power value is acquired on the output port; determining that the insertion loss is equal to a difference between a first power difference and the initial attenuation value, the first power difference being a difference between the input power value and the output power value.

In a possible implementation, the processing unit is specifically configured to: and acquiring the target attenuation value, wherein the target attenuation value is the difference between a second power difference value and the insertion loss, and the second power difference value is the difference between the input power value and the target power value.

In one possible implementation, the network device further includes: a first blocking unit, configured to block transmission of a local optical signal, where a wavelength of the local optical signal is equal to a wavelength of the calibration optical signal, and the local optical signal is an optical signal of an unsupported service generated by the network device.

In one possible implementation, the network device further includes: a second blocking unit, configured to block transmission of the calibration optical signal, where a wavelength of the calibration optical signal is equal to a wavelength of a service optical signal, and a power of the service optical signal at the output port is the target power value.

In a possible implementation manner, the network device further includes a transceiver unit, which is specifically configured to: sending a request message to an upstream network device, where the request message is used to request to confirm whether the upstream network device has the capability of sending the calibration optical signal; receiving an indication message from the upstream network device, wherein the indication message is used for indicating that the upstream network device has the capability of sending the calibration optical signal.

In a possible implementation, the processing unit is further configured to: and if the modulation mode of the optical signal from the upstream network equipment is a target modulation mode, determining that the optical signal is the calibration optical signal, and the target modulation mode is a modulation mode corresponding to the calibration optical signal.

In a possible implementation, the processing unit is further configured to: adjusting the attenuation value corresponding to the calibration optical signal to a maximum value; and gradually reducing the attenuation value corresponding to the calibration optical signal until the output power value is obtained at the output port.

In a third aspect, the present application provides a network device, comprising: a processor and a memory; the memory and the processor are interconnected by a line, the memory having stored therein instructions, the processor being configured to perform the method of calibrating insertion loss as described in any one of the above first aspects.

In a fourth aspect, embodiments of the present application provide a digital processing chip, where the chip includes a processor and a memory, where the memory and the processor are interconnected by a line, and the memory stores instructions, and the processor is configured to perform the processing-related functions in the method according to any one of the first aspect.

In a fifth aspect, the present application provides a readable storage medium comprising instructions that, when executed on an apparatus, cause the apparatus to perform the method of any of the first aspects as described above.

In a sixth aspect, the present application provides a program product comprising instructions which, when run on an apparatus, cause the apparatus to perform the method of any of the first aspects above.

Drawings

Fig. 1 is a diagram illustrating an example structure of an optical communication network provided in the present application;

fig. 2 is a diagram illustrating an example of a structure of any of network domains included in an optical communication network provided in the present application;

FIG. 3 is an exemplary diagram of a transmission path for transmitting optical signals provided herein;

FIG. 4 is a diagram of a first example structure of a ROADM provided herein;

FIG. 5 is a diagram of a second configuration of a ROADM as provided herein;

FIG. 6 is a diagram of a third example structure of a ROADM provided herein;

FIG. 7 is a flowchart illustrating a first exemplary embodiment of calibrating insertion loss provided herein;

FIG. 8 is a flow chart illustrating a second embodiment of calibrating insertion loss provided herein;

FIG. 9 is a flow chart illustrating a third embodiment of calibrating insertion loss provided herein;

FIG. 10 is a flow chart illustrating a fourth embodiment of calibrating insertion loss provided herein;

fig. 11 is a diagram illustrating an example of an architecture of an automatically switched optical network provided in the present application;

fig. 12 is a schematic structural diagram of a first network device provided in the present application;

fig. 13 is a schematic structural diagram of a second network device provided in the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

First, the structure of an optical communication network to which the method for calibrating insertion loss provided in the present application is applied will be described with reference to fig. 1. The optical communication network shown in this embodiment includes a plurality of network domains, for example, the optical communication network 100 shown in fig. 1 includes five network domains, that is, the network domain 101, the network domain 102, the network domain 103, the network domain 104, and the network domain 105 shown in fig. 1, and the number of the network domains included in the optical communication network is not limited in this embodiment. The network domain refers to a network laid out in a local geographic range, and the network domain can be connected with a remote network domain to form a network covering a larger geographic range.

The optical communication network further includes an optical fiber connected between two network domains, taking the network domain 101 and the network domain 103 as an example, the optical communication network further includes an optical fiber 110 connected between the network domain 101 and the network domain 103, and the embodiment does not limit the connection relationship between the plurality of network domains included in the optical communication network.

In the following, a structure of any network domain included in the optical communication network shown in fig. 1 is described with reference to fig. 2, specifically, fig. 2 shows a structure of the network domain 101, and for a description of a specific structure of other network domains included in the optical communication network shown in fig. 1, please refer to the description of the structure of the network domain 101 shown in this embodiment, which is not described in detail specifically.

The network domain 101 shown in fig. 2 includes at least one network device, such as an optical cross connect (OXC) device, an Optical Add Drop Multiplexer (OADM), a Fixed Optical Add Drop Multiplexer (FOADM), or a ROADM. The present embodiment is exemplarily illustrated by taking a network device as a ROADM. Fig. 2 illustrates that the network domain 101 includes 5 ROADMs, that is, a ROADM201, a ROADM202, a ROADM203, a ROADM204, and a ROADM205, as an example, it should be clear that the present embodiment does not limit the number of ROADMs included in the network domain 101.

The network domain 101 further includes an optical fiber connected between two ROADMs, taking ROADM201 and ROADM202 as an example, the network domain 101 further includes an optical fiber 210 connected between the ROADM201 and the ROADM202, and this embodiment does not limit the connection relationship between the plurality of ROADMs included in the network domain 101. At least some of the ROADMs included in this network domain 101 may have fibers that connect to other network domains that are adjacent, e.g., the ROADM202 shown in fig. 2 has a fiber 220 that is used to connect to network domain 103 (shown in fig. 1).

The transmission path of the service optical signal is described below with reference to fig. 3, where the transmission path shown in fig. 3 includes a first ROADM301 and a non-ROADM 302, where the first ROADM301 is used to send a service optical signal generated by a client device a or locally to a last ROADM302, and the last ROADM302 receives the service optical signal from the first ROADM201, and forwards the service optical signal to a client device B directly or after demodulation.

Optionally, the first ROADM301 may directly send the generated traffic optical signal to the non-ROADM 302, and optionally, the first ROADM301 may also forward the traffic optical signal to the non-ROADM 302 via one or more intermediate ROADMs, where in this embodiment, for example, the first ROADM301 forwards the traffic optical signal to the non-ROADM 302 via 3 intermediate ROADMs, and as can be seen, the traffic optical signal generated by the first ROADM301 shown in fig. 3 is forwarded sequentially via the

intermediate ROADMs

303, 304, and 305 to send the traffic optical signal to the non-ROADM 302. It should be clear that, in this embodiment, each ROADM (i.e., the first ROADM, the middle ROADM, and the non-ROADM) may be located in the same network domain, or may be located in different network domains, and is not limited in this embodiment.

The structure of the first ROADM301 in the transmission path of the traffic optical signal is described below with reference to fig. 4:

the first ROADM301 shown in fig. 4 includes one or more service boards, such as the service board 410 and the service board 411 shown in fig. 4, in this embodiment, a specific number of the service boards included in the first ROADM301 is not limited, and the service board is configured to generate a service optical signal, specifically, the service optical signal refers to an optical signal carrying a service. The first WSS402, the second WSS403, the optical amplifier 404, and the fiber transmission path interface unit (FIU) 405 are sequentially connected to the service board 410 and the service board 411 through optical fibers. Among other things, the FIU405 is used to detect the optical spectrum and optical performance of the service optical signal without interrupting the transmission of the service optical signal.

In this embodiment, the number of WSSs included in the first ROADM301 is not limited, and the multiple WSSs included in the first ROADM301 are located at different positions. The first ROADM301 is configured to implement scheduling of N dimensions of an optical signal, and in order to implement the purpose that a service optical signal can be transmitted along the transmission path shown in fig. 2, the first ROADM301 needs to perform scheduling of a target dimension on the service optical signal, where the target dimension is one of the N dimensions, and N is a positive integer greater than or equal to 1. In different dimensions, comprising different combinations of WSSs. It can be seen that, if the transmission paths of the service optical signals are different, the target dimensions through which the service optical signals pass at the first ROADM301 are different, and the following description is made of the target dimensions included in the first ROADM 301:

the target dimension at least includes a first WSS402 and a second WSS403, and optionally, the target dimension may further include one or more WSSs connected between the first WSS402 and the second WSS403, and/or include devices such as an optical amplifier connected between the first WSS402 and the second WSS403, which is not limited in this embodiment. The present embodiment is exemplified by taking the case that the first WSS402 and the second WSS403 are directly connected by optical fibers:

specifically, the first WSS402 receives a service optical signal from the service board 411, the service optical signal is transmitted along a first transmission direction, the first WSS402 sends the redirected service optical signal to the second WSS403 via an optical fiber, the second WSS403 redirects the service optical signal to implement scheduling of the service optical signal from the first transmission direction to a second transmission direction, the second WSS403 sends the service optical signal to the optical amplifier 404, the optical amplifier 404 amplifies the service optical signal and sends the amplified service optical signal to the FIU405, and the service optical signal is output from the first ROADM301 via the FIU405 to be transmitted to the downstream intermediate ROADM303 (as shown in fig. 3).

The structure of the intermediate ROADM303 is described below with reference to fig. 5, taking the intermediate ROADM303 as an example:

for the purpose of implementing that the service optical signal can be transmitted along the transmission path shown in fig. 3, the middle ROADM303 needs to schedule the service optical signal with the target dimension, and for the description of the target dimension, please refer to the description of the target dimension of the first ROADM301, which is not described in detail. In the target dimension of the intermediate ROADM303, there is a first FIU501, a first optical amplifier 502, a first WSS503, a second WSS504, a second optical amplifier 505, and a second FIU506. The service optical signal from the upstream first ROADM301 is transmitted to the second FIU506 through the first FIU501, the first optical amplifier 502, the first WSS503, the second WSS504, and the second optical amplifier 505 in sequence, and the service optical signal via the second FIU506 is output from the intermediate ROADM303 to be transmitted to the downstream intermediate ROADM304 (as shown in fig. 3). For a specific description, please refer to the description of the first ROADM301, which is not repeated herein, one or more devices may also be connected between the first WSS503 and the second WSS 504. For a description of each device included in the middle ROADM303, please refer to the description of the first ROADM301 for details, which is not described in detail. For the description of the structure of each intermediate ROADM in the transmission path of the service optical signal, please refer to the description of the intermediate ROADM303 for details, which is not described in detail.

The structure of the non-ROADM 302 is described below in conjunction with fig. 6:

for the purpose of enabling the service optical signal to be transmitted to the service board included in the non-ROADM 302, the non-ROADM 302 shown in this embodiment includes a FIU601, an optical amplifier 602, a first WSS603, a second WSS604, and a service board 605. A service optical signal from the upstream intermediate ROADM305 is sequentially transmitted to the service single board 605 through the FIU601, the optical amplifier 602, the first WSS603, and the second WSS604, where one or more devices may also be connected between the first WSS603 and the second WSS604, for a specific description, please refer to the description of the first ROADM301, which is not described herein again. As can be seen from fig. 3 to fig. 6, the service optical signal from the service board 410 of the first ROADM301 sequentially passes through the intermediate ROADM303, the intermediate ROADM304, and the intermediate ROADM305 to be transmitted to the service board 605 without the ROADM302, and for the description of each device included in the ROADM302, please refer to the description of the first ROADM301 for details, which is not described herein.

The optical communication network shown above is an analog system, and an optical signal generates insertion loss during internal transmission of the ROADM, and in the optical communication network, if the optical signal is transmitted along different transmission paths, the optical signal generates different insertion loss during transmission, and optical signals with different wavelengths also generate different insertion loss during transmission along the same transmission path. The method for calibrating insertion loss provided by the present application is used to calibrate insertion loss generated in the process of transmitting an optical signal with a specific wavelength in a specific ROADM, so as to improve the accuracy of the obtained power loss, and the following description is first made with reference to a flow shown in fig. 7 for performing calibration of insertion loss on a local ROADM: here, the local ROADM shown in this embodiment is one ROADM on the transmission path shown in fig. 3.

Step 701, the local ROADM sends a request message to the upstream ROADM.

First, the following describes conditions for triggering the local ROADM to execute the insertion loss calibration procedure shown in this embodiment:

condition 1

And after the local ROADM is powered on, the local ROADM automatically executes the process of calibrating the insertion loss.

Condition 2

The local ROADM may configure a calibration period, and the local ROADM may periodically perform a calibration insertion loss procedure on the local ROADM based on the calibration period.

Condition 3

And the local ROADM receives a test message from the network management equipment, wherein the test message is used for indicating that the local ROADM needs to carry out a calibration insertion loss process. For example, if the network management device determines that the transmission path shown in fig. 3 needs to transmit the service optical signal, the network management device may send the test information to one or more ROADMs on the transmission path, so as to calibrate the insertion loss of each ROADM on the transmission path.

The following describes an execution main body for executing this step, for example, the execution main body may be a control plane located in a local ROADM, and this embodiment takes the case that the control plane is located on an independent board in the local ROADM as an example. For another example, the executing main body may be a network management device in an optical communication network, where the network management device is connected to the control planes of one or more ROADMs, and this embodiment takes the executing main body as the control plane in the local ROADM for example.

It should be clear that, if the local ROADM is the first ROADM in the transmission path shown in fig. 3, steps 701 to 702 shown in this embodiment are optional steps to be executed, where the first ROADM is any intermediate ROADM or non-ROADM in the transmission path shown in fig. 3.

If the ROADM implementing the flow shown in this embodiment is the first ROADM shown in fig. 3, step 703 is directly implemented without implementing steps 701 to 702.

The request message is used to request to confirm whether the upstream network device has the capability of sending the calibrated optical signal, and the local ROADM shown in this embodiment is used to perform a calibration process of insertion loss according to the calibrated optical signal from the upstream ROADM. As shown in fig. 3, if the current ROADM performing the calibrated insertion loss is an intermediate ROADM304, the intermediate ROADM304 sends a request message to the upstream ROADM 303. If the local ROADM performing the calibration of the insertion loss is the intermediate ROADM303, a request message is sent to the upstream first ROADM301 of the intermediate ROADM 303.

Step 702, the upstream ROADM sends an indication message to the local ROADM.

In this embodiment, when the upstream ROADM determines that the upstream ROADM has the capability of sending the standard optical signal, the upstream ROADM may send an indication message to the local ROADM. Specifically, if the upstream ROADM determines that the upstream ROADM is configured with a Light Source (LS), an indication message is sent to the local ROADM. For example, the optical source may be located within an upstream ROADM, the optical splitter may split the optical source to each WSS of the upstream ROADM, and the indication message may be sent to the local ROADM if the control plane of the upstream ROADM determines that the upstream ROADM is capable of receiving the light from the splitter. The request message of step 701 and the indication message of step 702 may be implemented by a private protocol. Alternatively, each ROADM notifies whether it has the capability of transmitting the specified optical signal to other ROADMs through an Open Shortest Path First (OSPF), and the request message of step 701 and the indication message of step 702 may be combined into one notification message.

And step 703, determining the target dimension by the local ROADM.

Optionally, by executing steps 701 to 702, the local ROADM executes the insertion loss calibration flow shown in the subsequent step only when determining that the upstream ROADM has the capability of sending the calibration optical signal, so as to effectively improve the success rate of calibrating the insertion loss of the local ROADM.

The target dimension shown in this embodiment may be understood as a transmission path for a nominal optical signal to be transmitted within a local ROADM. Specifically, in the process of calibrating the insertion loss of the local ROADM, a target dimension to be calibrated is first determined from N dimensions supported by the local ROADM, where the target dimension shown in this embodiment is any one of the N dimensions supported by the local ROADM, and if different optical signals are transmitted along different dimensions of the local ROADM, the different optical signals are transmitted along different transmission paths in the optical communication network, and a detailed description of the transmission paths is shown in fig. 3 and is not specifically described here.

Several alternative ways of determining the target dimension by the local ROADM are exemplified below:

mode 1

In the N dimensions supported by the local ROADM, the local ROADM sequentially trains the determined target dimensions, specifically, the local ROADM first determines a first dimension of the N dimensions as the target dimension, where different dimensions refer to different combinations of input ports and output ports included by the local ROADM. After the procedure of calibrating the insertion loss shown in this embodiment is performed on the target dimension, the local ROADM determines the second dimension of the N dimensions as the target dimension again until the local ROADM determines the nth dimension of the N dimensions as the target dimension. In the present embodiment, the local ROADM determines the target dimension among N dimensions in a round-robin manner, and in other embodiments, the local ROADM may also determine the target dimension among N dimensions sequentially in a random manner.

Mode 2

In N dimensions, the local ROADM determines M dimensions as target dimensions at the same time, so that the local ROADM can perform the process of calibrating the insertion loss shown in this embodiment on the M target dimensions at the same time, so as to improve the efficiency of calibrating the insertion loss for the local ROADM, where M is any integer greater than or equal to 2 and less than or equal to N.

Optionally, if the local ROADM shown in this embodiment is a broadcast ROADM wavelength division unit (RDU), the target dimension shown in this embodiment is multiple, specifically, in a case where the local ROADM has multiple input ports and multiple output ports, the local ROADM selects one input port from the multiple input ports, and the input port and each output port of the local ROADM are formed as the target dimension for performing the insertion loss calibration.

And step 704, the local ROADM acquires the calibration optical signal.

The source of the calibration optical signal is first explained below:

local ROADMs in the transmission path shown in fig. 3, the difference of network locations may cause the local ROADM to obtain the calibration optical signal from different sources, as follows:

type 1

If the local ROADM is a non-first ROADM in the transmission path shown in fig. 3, the local ROADM receives the calibration optical signal from the upstream ROADM, and details of the description of the non-first ROADM are shown in the above description and are not described in detail.

Specifically, the calibration optical signal used to calibrate the insertion loss of the local ROADM is derived from the upstream ROADM, e.g., an optical source provided by the upstream ROADM may send the calibration optical signal to the local ROADM. In this embodiment, the time when the upstream ROADM sends the calibrated optical signal to the local ROADM is not limited, as long as the upstream ROADM sends the calibrated optical signal to the local ROADM before sending the service optical signal to the local ROADM, where the calibrated optical signal and the service optical signal are transmitted along the same target dimension in the local ROADM.

Type 2

If the local ROADM is the first ROADM in the transmission path shown in fig. 3, the local ROADM receives the calibration optical signal generated by the service board in the local ROADM.

Next, the function of the calibration optical signal is explained:

before the local ROADM transmits the service optical signal, the attenuation value of a Variable Optical Attenuator (VOA) corresponding to the calibrated optical signal is adjusted to a target attenuation value through the calibrated optical signal, so that the power value output by the calibrated optical signal from the output port of the local ROADM reaches the target power value.

In this embodiment, the calibration optical signal and the service optical signal with the same wavelength are both transmitted along the target dimension in the local ROADM, and when the target dimension of the local ROADM has transmitted the calibration optical signal, the local ROADM has already obtained the target attenuation value, and when the local ROADM subsequently transmits the service optical signal, the local ROADM directly adjusts the VOA corresponding to the service optical signal to the target attenuation value, so that the service optical signal can also be output from the output port at the target power value.

Therefore, the transmission is carried out along the same target dimension, and the multi-path calibration optical signals with different wavelengths acquire different target attenuation values, so that the transmission along the target dimension is realized, and the attenuation values of the VOAs corresponding to the multi-path service optical signals with different wavelengths are accurately adjusted.

The contents of the calibration optical signal will be explained again:

in order to realize that the calibration signal and the service optical signal are transmitted along the same target dimension in the local ROADM, the wavelength of the calibration optical signal is equal to that of the service optical signal.

In order to enable the local ROADM to achieve the purpose of acquiring an accurate target attenuation value for different service optical signals, the upstream ROADM may acquire multiple paths of calibration optical signals with different wavelengths. For example, if the local ROADM transmits optical signals in the C band, the wavelength of the N-phase fixed optical signals acquired by the local ROADM covers all possible wavelength values in the C band. For another example, if the local ROADM transmits an optical signal in the L-band, the wavelength of the N-way specified optical signal acquired by the current ROADM covers all possible wavelength values in the L-band. The present embodiment does not limit the wavelength value of each calibration optical signal obtained by the local ROADM, as long as when the local ROADM needs to transmit a service optical signal, the wavelength value of the service optical signal is equal to one of the N wavelength values of the N-way calibration optical signals.

Each calibration optical signal shown in this embodiment is an optical signal that does not carry a service, that is, the calibration optical signal does not need to carry a service carried by a service optical signal, and only needs to have the same wavelength as the service optical signal, so that the service optical signal and the calibration optical signal with the same wavelength are transmitted along the same target dimension in the local ROADM.

The way how the current ROADM determines the acquired optical signal to be the calibration optical signal is explained again:

mode 1

After the local ROADM sends a request message to the upstream ROADM via step 702 shown above, it can be determined that the optical signal received from the upstream ROADM is a calibration optical signal.

Mode 2

The received optical signal is a calibration optical signal after the local ROADM is powered on, so that the local ROADM firstly executes the calibration flow of the insertion loss after being powered on.

Mode 3

The local ROADM determines a modulation mode of the received optical signal, where if the local ROADM is a non-first ROADM, the optical signal is originated from an upstream ROADM, and if the local ROADM is a first ROADM, the optical signal is originated from the local ROADM, for example, a service board originated from the local ROADM.

After the optical signal received by the local ROADM, the local ROADM determines a modulation mode of the optical signal, and the local ROADM stores a target modulation mode in advance, wherein the target modulation mode is a modulation mode corresponding to the calibration optical signal, and thus, if the local ROADM determines that the modulation mode of the optical signal is the target modulation mode, the local ROADM can determine that the optical signal is the calibration optical signal.

In this embodiment, a specific modulation mode of the target modulation mode is not limited, for example, the target modulation mode is a set-top mode, so that a peak position of the calibration optical signal is different from a peak position of the service optical signal, and thus the local ROADM can distinguish the calibration optical signal and the service optical signal according to the peak position of the optical signal.

Step 705, the local ROADM blocks the transmission of the local optical signal.

The local optical signal shown in this embodiment may also be referred to as a dummy optical signal, where the local optical signal is generated by an optical source of a local ROADM, and for the description of the local optical source, please refer to the above description of the optical source of the upstream ROADM for details, which is not described in detail. The local optical signal is an optical signal that does not carry a service, and the wavelength of the local optical signal is not limited in this embodiment as long as the local optical signal covers all possible wavelengths of the service optical signal transmitted by the local ROADM. For example, the local light signal is white light. The local optical signal is used for ensuring that each channel of the target dimension of the local ROADM has optical signal transmission, so that the balance of optical signal transmission is ensured.

For example, the local ROADM may include multiple channels in the target dimension, where different channels transmit optical signals with different wavelengths, specifically, 80 channels in the target dimension, and the 80 channels respectively transmit optical signals with λ 1, λ 2 to λ 80. The optical sources of the local ROADM generate local optical signals having λ 1 to λ 80. If the target dimension of the local ROADM is used for transmitting the traffic optical signals λ 1, λ 2 to λ 10, the local ROADM blocks the local optical signals having λ 1, λ 2 to λ 10, so that the optical signals are transmitted in all 80 channels included in the target dimension. Of these, 10 channels are used to transmit traffic optical signals with λ 1, λ 2 to λ 10, and the other 70 channels are used to transmit local optical signals with λ 11 to λ 80. Therefore, the optical signal transmission of each channel on the target dimension is effectively ensured through the local optical signal.

In this embodiment, before transmitting the calibration optical signal in the target dimension of the local ROADM, the local optical signal having the same wavelength as the calibration optical signal in the target dimension needs to be blocked, so that the calibration optical signal can be transmitted in the target dimension, and collision between the local optical signal having the same wavelength and the calibration optical signal is avoided. Alternatively, blocking of the local optical signal may be achieved by adjusting the VOA used to adjust the attenuation value of the local optical signal to a maximum value.

For example, if the local ROADM determines that the wavelengths of the calibration optical signals derived from the upstream ROADM or from the service board are λ 3 to λ 80, the local ROADM blocks the local optical signals with the wavelengths of λ 3 to λ 80 generated by the local ROADM, so that a channel for transmitting the optical signals with the wavelengths of λ 3 to λ 80 does not perform transmission of the local optical signals any more, but is used for transmitting the calibration optical signals with the wavelengths of λ 3 to λ 80 generated by the upstream receiving or service board, thereby effectively avoiding collision between transmission of the calibration optical signals with the same wavelength and transmission of the local optical signals in the local ROADM, where each calibration optical signal is input from an input port with a target dimension and is output from an output port with the target dimension, and thus the calibration optical signals acquired by the local ROADM can be transmitted from the input port to the output port of the local ROADM.

Step 706, the local ROADM obtains the input power value of the calibrated optical signal.

When the local ROADM acquires the calibration optical signal, the local ROADM may acquire the power value of the calibration optical signal on the input port of the local ROADM.

Taking a local ROADM as an intermediate ROADM shown in fig. 5 as an example, after entering the local ROADM, the calibrated optical signal may be transmitted to two or more WSSs for redirection, and the local ROADM shown in this embodiment needs to acquire an input power value before the calibrated optical signal is transmitted to the two or more WSSs.

For example, the local ROADM may obtain the input power value of the calibration optical signal at the input port of the first FIU501, or, for example, the local ROADM may obtain the input power value of the calibration optical signal at the input port of the first optical amplifier 502, or, for example, the local ROADM may obtain the input power value of the calibration optical signal at the input port of the first WSS503, and this embodiment takes the input power value as the power value of the calibration optical signal at the input port of the first optical amplifier 502 as an example for exemplary illustration.

Taking local ROADM as the first ROADM shown in fig. 4 as an example, the calibrated optical signal generated by the service board 410 is transmitted to the first WSS402 via the port of the service board 410, the port of the service board 410 is used as an input port, and the local ROADM can obtain an input power value at the port of the service board 410. As another example, a local ROADM may obtain an input power value for a nominal optical signal on an input port of first WSS 402.

Taking a local ROADM as an example that is not the ROADM shown in fig. 5, the local ROADM may obtain the input power value of the calibration optical signal at the input port of the FIU601, for example, the local ROADM may obtain the input power value of the calibration optical signal at the input port of the optical amplifier 602, and for example, the local ROADM may obtain the input power value of the calibration optical signal at the input port of the first WSS 603.

And step 707, the local ROADM acquires the output power value of the calibrated optical signal.

After the calibration optical signal is redirected through two or more WSSs included in the local ROADM, the local ROADM can obtain the power value of the calibration optical signal on the output port.

As shown in fig. 5, the local ROADM may obtain the output power value of the calibration optical signal at the output port of the second WSS504, and for example, the local ROADM may obtain the output power value at the output port of the second optical amplifier 505, and for example, the local ROADM may obtain the output power value at the output port of the second FIU506, and this embodiment takes the output power value as the power value of the calibration optical signal at the output port of the second optical amplifier 505 as an example for exemplary illustration.

Continuing with the example shown in fig. 4, the local ROADM may obtain the output power value of the calibration optical signal at the output port of the second WSS403, for example, the local ROADM may obtain the output power value at the output port of the optical amplifier 404, and for example, the local ROADM may obtain the output power value at the output port of the FIU 405.

Continuing again with the example of fig. 6, the local ROADM may obtain the output power value of the calibration optical signal at the output port of the second WSS 604. Optionally, if the local ROADM shown in this embodiment is an unaddressed ROADM, after the unaddressed ROADM obtains the output power value, the transmission of the calibration optical signal is terminated at the output port of the second WSS604, and because the calibration optical signal shown in this embodiment does not carry a service, if the calibration optical signal is transmitted to the service board, interference and burden on the service board may be caused, then after the output power value of the calibration optical signal is obtained, the transmission of the calibration optical signal may be terminated, so that the calibration optical signal is prevented from being transmitted to the service board.

And step 708, the local ROADM acquires the insertion loss.

The insertion loss shown in this embodiment is an insertion loss generated between the input port and the output port, and the following describes a flow of calculating the insertion loss by the local ROADM with reference to formula 1:

equation 1 is: the insertion loss = a first power difference value — an initial attenuation value, where the first power difference value = an input power value — an output power value, and the initial attenuation value is an attenuation value of a local ROADM in a state where the local ROADM acquires the output power value on an output port, and equation 1 is described below with reference to a specific example:

for example, if the input power value of the calibrated optical signal acquired by the local ROADM on the input port is 10dBm (decibel milliwatt), and the output power value of the calibrated optical signal acquired by the local ROADM on the output port is 4dB, the first power difference value is 10-4=6dB (decibel), and the initial attenuation value of the VOA used for adjusting the attenuation value in the transmission process of the calibrated optical signal is 1dB, then the insertion loss of the local ROADM is 6-1=5dB. And during the transmission process of the local ROADM along the target dimension, the insertion loss of the service optical signal with the wavelength equal to that of the calibration optical signal is also 5dB.

It can be seen that, by using the method shown in this embodiment, an optical signal (e.g., a dummy optical signal) that is not carrying a service and is generated by a service board from an upstream ROADM or a local ROADM may be used as a calibration optical signal to obtain an insertion loss of the service optical signal in the process of transmission by the local ROADM, thereby implementing calibration of the insertion loss of the service optical signal that is transmitted along different dimensions and has different wavelengths.

And step 709, the local ROADM acquires a target attenuation value according to the insertion loss.

First, the purpose of executing this step will be explained:

in order to enable the traffic optical signal to be output from the output port at the target power value, the local ROADM adjusts the attenuation value of the VOA to the target attenuation value, specifically, the VOA for adjusting the attenuation value between the traffic optical signal transmitted from the input port to the output port, and it can be seen that the traffic optical signal is output from the output port at the target power value in the case where the attenuation value of the VOA is the target attenuation value.

Next, to realize that the service optical signal is output from the output port at the target power value, the function of the calibration optical signal will be described:

as can be seen from the above description, the wavelengths of the service optical signal and the calibration optical signal are the same, and the service optical signal and the calibration optical signal are transmitted in the local ROADM along the same target dimension, so that the insertion loss in the process of transmitting the service optical signal from the input port to the output port is the same as the insertion loss in the process of transmitting the calibration optical signal from the input port to the output port, and thus, if the attenuation values of the calibration optical signal and the service optical signal are both adjusted to the target attenuation value by the local ROADM, the calibration optical signal and the service optical signal can both be output from the output port at the target power value.

Thirdly, the process of obtaining the target attenuation value by the local ROADM is explained:

in this embodiment, the local ROADM may obtain the target attenuation value based on the insertion loss, and specifically, the local ROADM calculates the target attenuation value according to formula 2 as shown below:

equation 2: target attenuation value = second power difference value-insertion loss, wherein the second power difference value = input power value-target power value.

Several possible scenarios for the target power value are illustrated below:

case 1

The target power value may be a nominal power value, that is, a nominal power value having the same or substantially the same value is preset for each of the calibrated optical signals transmitted along the target dimension of the local ROADM, so that the calibrated optical signals having different wavelengths transmitted along the target dimension can be output from the output port at the nominal power value, and the power value balance of each path of calibrated optical signals output from the output port is effectively improved.

Case 2

In this embodiment, the target power value is any power value greater than or equal to the minimum power value, specifically, if the target power value of the optical signal is greater than or equal to the minimum power value, the optical signal will be detected by the local ROADM on the output port, and if the target power value of the optical signal is less than the minimum power value, the optical signal will not be detected by the local ROADM on the output port.

Case 3

The target power value can ensure the performance of an optical signal to noise ratio (OSNR) of the calibration optical signal in the transmission process of the target dimension, that is, the OSNR performance of the calibration optical signal can be ensured when the calibration optical signal is output from the output port at the target power value.

As can be seen, the local ROADM shown in this embodiment calculates a target attenuation value based on the formula 2 shown above, and when the input port of the local ROADM receives a service optical signal, the service optical signal and the calibration optical signal are transmitted in the local ROADM along the same target dimension, and when the wavelength of the service optical signal is equal to the wavelength of the calibration optical signal, the local ROADM adjusts the VOA for adjusting the attenuation value of the service optical signal to the target attenuation value, so that the insertion loss generated by the service optical signal between the input port and the output port is the target attenuation value, and the service optical signal can be output from the output port at a target power value.

In this embodiment, the condition for the local ROADM to execute step 709 is not limited, for example, after the local ROADM determines the insertion loss through step 708, the local ROADM executes step 709. For another example, after the local ROADM executes step 709, the insertion loss is stored, and a preset mapping table is established, where the preset mapping table establishes a mapping relationship between a target dimension, a target wavelength, and an insertion loss, where the target wavelength is a wavelength of the calibration optical signal, and thus, when the input port receives a service optical signal with the target wavelength, the local ROADM may determine, based on the preset mapping table, the target dimension and the insertion loss corresponding to the target wavelength, and the local ROADM may transmit the service optical signal along the target dimension, and the local ROADM further implements, through step 709, adjustment of the attenuation value of the VOA, so as to adjust the attenuation value of the VOA to the target attenuation value. Therefore, the local ROADM can calculate the target attenuation value only when determining that the local ROADM acquires the service optical signal with the target wavelength, and the local ROADM does not need to calculate the target attenuation values of other calibration optical signals with non-target wavelengths, so that the calculation amount of the processor is effectively reduced.

By adopting the method shown in the embodiment, the calibration optical signals with different wavelengths and the calibration optical signals transmitted along different target dimensions can be accurately distinguished, the insertion loss in the local ROADM is increased, and the accuracy of determining the insertion loss of the calibration optical signals is effectively improved. The accurate adjustment of the output power of the service optical signal can be effectively realized based on the accurate insertion loss.

Because the calibration of the insertion loss of the target dimension is realized through the calibration optical signals, it can be seen that the local ROADM realizes the calibration of the insertion loss of multiple channels of the same target dimension through multiple paths of calibration optical signals, and can calibrate the insertion loss of multiple target dimensions at the same time, thereby effectively reducing the manual operation amount and improving the calibration efficiency of the insertion loss.

The flow of performing calibration of the insertion loss of the local ROADM shown in fig. 7 is described, and how to implement transmission of the service optical signal after completing the calibration flow of the insertion loss of the local ROADM is described with reference to fig. 8.

The execution process of step 801 to step 809 is shown in step 701 to step 709 shown in fig. 7 in detail, which is not described again specifically;

step 810, the local ROADM acquires the service optical signal.

The following first explains the source of the service optical signal:

local ROADMs in the transmission path shown in fig. 3, the difference of network locations may cause the local ROADM to obtain the service optical signal from different sources, as follows:

type 1

If the local ROADM is the non-first ROADM in the transmission path shown in fig. 3, the local ROADM receives the service optical signal from the upstream ROADM, and details of the non-first ROADM are shown in the above description and will not be described in detail.

Type 2

If the local ROADM is the first ROADM in the transmission path shown in fig. 3, the local ROADM receives a service optical signal generated by a service board in the local ROADM.

In this embodiment, the number of the service optical signals is not limited, for example, an input port of a local ROADM receives one or more service optical signals, and for better description, this embodiment takes a service optical signal as one path for an exemplary description.

For example, in the embodiment shown in fig. 7, the target dimension of the local ROADM transmits 80 wavelengths of the calibration optical signals, and the wavelengths of the 80 calibration optical signals may be λ 1, λ 2 to λ 80, respectively, where the wavelength of one of the 80 target calibration optical signals is equal to the wavelength of the service optical signal shown in this embodiment and is both λ 1. It can be seen that the transmission path of the traffic optical signal with λ 1 at the local ROADM is the same as the transmission path of the target calibration optical signal with λ 1 at the local ROADM. The present embodiment does not limit the specific number of paths of the target calibration optical signal.

Step 811, the local ROADM blocks the transmission of the target calibration optical signal.

In this embodiment, the service optical signal with λ 1 is transmitted in the local ROADM along the target dimension, if both the service optical signal with λ 1 and the target calibration optical signal are transmitted to the output port along the target dimension, a collision between the service optical signal with λ 1 and the target calibration optical signal on the output port may be caused, and in order to avoid the collision, the local ROADM shown in this embodiment needs to block the transmission of the target calibration optical signal, so that only the service optical signal is transmitted to the output port between the service optical signal with λ 1 and the target calibration optical signal, thereby effectively avoiding the collision on the output port.

It should be clear that, in this embodiment, the description of the process of blocking the target calibration optical signal is an optional example and is not limited.

In this embodiment, the local ROADM may adjust the attenuation value of the VOA for adjusting the attenuation value of the target calibration optical signal to a maximum value, and when the attenuation value of the VOA is the maximum value, the target calibration optical signal is blocked and cannot be transmitted to the output port, so that only the service optical signal with λ 1 is transmitted to the output port along the target dimension.

Step 812, the local ROADM outputs the service optical signal through the output port.

In this embodiment, when a service optical signal with λ 1 is transmitted, a target attenuation value of a target calibration optical signal with λ 1 is determined, and the local ROADM may adjust the VOA for adjusting the attenuation value of the service optical signal to the target attenuation value, so that when the service optical signal is transmitted to the output port, an output power value obtained by the local ROADM on the output port is the target power value, and details of the target power value are described in the embodiment shown in fig. 7, which is not described in detail.

By adopting the method shown in this embodiment, when the local ROADM receives the service optical signal from the upstream ROADM, the calibration optical signal for calibrating the transmission path of the service optical signal in the local ROADM can be blocked, so that the local ROADM can only acquire the output power value of the service optical signal at the output port, thereby avoiding the conflict between the service optical signal and the calibration optical signal at the output port, and the local ROADM can adjust the output power value of the service optical signal to the target power value based on the insertion loss of the calibration optical signal, thereby achieving the purpose of accurately adjusting the output power value of the service optical signal, and effectively improving the efficiency of adjusting the output power value of the service optical signal.

The embodiment shown in fig. 8 illustrates how the local ROADM implements transmission of the service optical signal, and the following describes, in combination with the embodiment shown in fig. 9, how to reduce interference of transmission of the calibration optical signal on the service optical signal when the local ROADM simultaneously transmits the service optical signal and the calibration optical signal:

the specific execution process from step 901 to step 905 is shown in detail in step 701 to step 705 shown in fig. 7, and the specific execution process is not described in detail in this embodiment.

Step 906, the local ROADM determines a plurality of packets.

Specifically, in the case where multiple calibration optical signals from an upstream ROADM are acquired by the local ROADM shown in this embodiment, if all the calibration optical signals are directly transmitted through the local ROADM at the same time, interference may be caused to the transmitted service optical signals, for example, if, of 80 channels on the target dimension of the local ROADM, a channel from λ 1 to λ 10 is used for transmitting the service optical signals, and a channel from λ 11 to λ 80 is used for transmitting the calibration optical signals, and if the local ROADM directly transmits the calibration optical signals through a channel from λ 11 to λ 80, interference may be caused to the service optical signals transmitted by the channel from λ 1 to λ 10.

In this embodiment, in order to avoid interference to the transmission of the service optical signal as much as possible, the local ROADMs may perform the transmission of the calibration optical signal in groups.

Specifically, the local ROADM first groups the multi-path calibration optical signals, where each group includes one or more calibration optical signals. Continuing with the above example, where the nominal optical signals are 70-way and have wavelengths λ 11 to λ 80, the local ROADM may divide the nominal optical signals into 7 groups, each group having 70-way nominal optical signals, such as a first group including nominal optical signals having wavelengths λ 11 to λ 20, and so on, and an eighth group including nominal optical signals having wavelengths λ 71 to λ 80.

The local ROADM firstly blocks a channel, corresponding to the first group, for transmitting the local optical signal in a target dimension, that is, blocks the local optical signal with the wavelength λ 11 to λ 20, the local ROADM can transmit the first group of calibration optical signals through the channel with the wavelength λ 11 to λ 20 in the target dimension, after the local ROADM obtains an output power value of each calibration optical signal in the first group, the local ROADM transmits the second group through the target dimension, and so on, the local ROADM transmits the eighth group through the channel with the wavelength λ 71 to λ 80 in the target dimension.

The above example is exemplified by the local ROADM blocking all local optical signal packets transmitted in the target dimension, so that each set of calibration optical signals can be transmitted via the target dimension in a packet manner. In this embodiment, the rule for grouping the plurality of calibration optical signals is not limited, for example, the local ROADM may randomly group the plurality of calibration optical signals.

Step 907, the local ROADM obtains the input power value of the calibrated optical signal.

The specific execution process of step 907 shown in this embodiment is shown in step 706 shown in fig. 7, and is not described in detail here.

Step 908, local ROADM adjusts the attenuation value of the target VOA to a maximum value.

The target VOA shown in this embodiment is a VOA used for adjusting the attenuation value of any one of the plurality of calibration optical signals.

In this embodiment, in order to reduce the influence of the calibration optical signal on the transmission of the service optical signal transmitted by the local ROADM to the minimum, the local ROADM adjusts the attenuation value of the target VOA to the maximum, so that the power output by the calibration optical signal after passing through the target VOA is the minimum, and thus, when the attenuation value of the target VOA is the maximum, the influence of the calibration optical signal on the service optical signal transmitted by the local ROADM is the minimum.

Step 909, the local ROADM gradually reduces the attenuation value of the target VOA until an output power value is obtained on the output port.

In this embodiment, the local ROADM may gradually decrease the attenuation value of the target VOA by obtaining the output power value on the output port to obtain the target attenuation value, specifically, the local ROADM may preset a preset value, and the present embodiment does not limit a specific value of the preset value, and the local ROADM may decrease the attenuation value of the target VOA by the preset value each time, and then detect the output port, if the output power value of the calibration optical signal is detected on the output port, the attenuation value of the target VOA is not decreased, and if the output power value of the calibration optical signal is not detected on the output port, the preset value is continuously subtracted from the attenuation value of the target VOA.

For example, the preset value may be 0.5dB, and the maximum value of the attenuation value of the target VOA is 5dB, if the local ROADM determines that the attenuation value of the target VOA is 5-0.5=4.5, whether the output power value of the calibration optical signal is detected on the output port, if yes, the attenuation value of the target VOA is not reduced, if no, the attenuation value of the target VOA is continuously subtracted by the preset value again, that is, 4.5-0.5=4, and the subsequent process is not described again until the local ROADM detects the output power value of the calibration optical signal on the output port.

The execution process from step 910 to step 912 shown in this embodiment is shown in step 707 to step 709 shown in fig. 7, and the specific execution process is not described again. It should be clear that, because the local ROADM shown in this embodiment groups a plurality of calibrated optical signals from an upstream ROADM, the local ROADM may perform the insertion loss calculation process for each group separately, or may perform the insertion loss calculation process for all calibrated optical signals transmitted through a target dimension in a unified manner when all groups are obtained.

By adopting the method shown in this embodiment, when the local ROADM needs to transmit a plurality of calibration optical signals, the plurality of calibration optical signals can be transmitted in a packet manner, the attenuation value of each calibration optical signal is adjusted to be maximum, and then the attenuation value is gradually reduced until the output power value is detected on the output port, so that the influence of the calibration optical signals transmitted by the local ROADM on the transmission of the service optical signals is effectively reduced.

In the embodiment shown in fig. 8, the local ROADM is responsible for blocking the targeted optical signal, and how the local ROADM is responsible for blocking the downstream targeted optical signal sent to the downstream ROADM is described below with reference to fig. 10, the local ROADM shown in this embodiment may be any ROADM in the non-ROADM 302 of the transmission path shown in fig. 3, for example, the local ROADM may be the first ROADM301 or any local ROADM.

Step 1001, the local ROADM acquires the service optical signal.

Please refer to step 810 shown in fig. 8, which is not described in detail in the specific implementation process of step 1001 shown in this embodiment. The service optical signal shown in this embodiment is derived from the service board of the first ROADM301, and for detailed description, see fig. 4 for details, which are not described in detail.

Step 1002, the local ROADM determines a target downstream calibration optical signal.

In this embodiment, please refer to the description of step 704 in fig. 7 for the local ROADM receiving the calibrated optical signal from the upstream ROADM for the description of how the local ROADM sends the down vernier calibrated optical signal to the downstream ROADM based on the light source, which is not described in detail herein.

In this embodiment, for example, a local ROADM sends N downstream calibration optical signals to a downstream ROADM, where the downstream ROADM is used to calibrate an insertion loss according to the downstream calibration optical signals.

For example, the local ROADM sends 80 paths of downstream calibration optical signals to the downstream ROADM, and the wavelengths of the 80 paths of downstream calibration optical signals are λ 1, λ 2 to λ 80, and the local ROADM is configured to determine a target downstream calibration optical signal in the 80 paths of downstream calibration optical signals, where the target lower vernier calibration optical signal means that the wavelength of the target lower vernier calibration optical signal is equal to the wavelength of a service optical signal to be sent by the local ROADM to the downstream ROADM, and the target downstream calibration optical signal has the same transmission dimension as the service optical signal to be sent in the downstream ROADM.

For example, the target downstream calibration optical signal is an 80-path downstream calibration optical signal, and the downstream calibration optical signal has λ 2, it can be seen that the wavelength of the service optical signal to be sent by the local ROADM to the downstream ROADM is also λ 2, and the target downstream calibration optical signal having λ 2 and the service optical signal have the same transmission dimension in the downstream ROADM.

And step 1003, the local ROADM blocks the target downstream calibration optical signal.

If the service optical signal and the target lower vernier fixed optical signal with the same wavelength are both transmitted to the downstream ROADM, a collision between the transmission of the service optical signal and the transmission of the target lower vernier fixed optical signal may be caused in the downstream ROADM, and it is visible that, to avoid the collision, the local ROADM shown in this embodiment blocks the transmission of the target lower vernier fixed optical signal, so that the target lower vernier fixed optical signal is not transmitted to the downstream ROADM, which causes the downstream ROADM to only receive the service optical signal between the service optical signal with the same wavelength and the target lower vernier fixed optical signal, and please refer to the process of the local ROADM shown in step 812 of fig. 8 for blocking the target lower vernier fixed optical signal, which is not described in detail.

Continuing with the example shown in step 1002, in order to avoid that the traffic optical signal with λ 2 and the target downstream calibration optical signal have the same transmission path in the downstream ROADM, and the traffic optical signal with λ 2 and the target downstream calibration optical signal collide with each other during the transmission of the downstream ROADM, the local ROADM shown in this embodiment may block the transmission of the target downstream calibration optical signal, so that the downstream ROADM may receive optical signals with 80 wavelengths, where the optical signals with λ 1, λ 3 to λ 80 are calibration optical signals, and the optical signal with λ 2 is a traffic optical signal, and thus, the downstream ROADM may not receive the traffic optical signal with the wavelength λ 2 and the target lower vernier calibration optical signal at the same time, thereby avoiding the collision between the target downstream calibration optical signal and the traffic optical signal.

Step 1004, the local ROADM transmits the service optical signal and the downstream calibration optical signal to the downstream ROADM.

And step 1005, the downstream ROADM receives the service optical signal and the downstream calibration optical signal from the local ROADM.

After acquiring the downstream calibration optical signal, the downstream ROADM may calibrate the insertion loss of the downstream ROADM, and for a specific process, reference is made to fig. 7, which is not described in detail. Please refer to fig. 8 for the process of the downstream ROADM on the service optical signal, which is not described in detail.

It can be seen that, by using the method shown in this embodiment, the local ROADM blocks the target lower vernier fixed optical signal having the same wavelength as the service optical signal, so that the target lower vernier fixed optical signal is not transmitted to the downstream ROADM, and the downstream ROADM does not receive the service optical signal having the same wavelength and the target downstream fixed optical signal at the same time, thereby effectively avoiding the collision between the target lower vernier fixed optical signal having the same wavelength and the service optical signal at the downstream ROADM.

Based on the method shown in the above embodiment, the following describes possible application scenarios of the method for calibrating insertion loss shown in the present application:

scene 1

The application scenario is an opening scenario, that is, under the condition that a transmission path as shown in fig. 3 is configured in an optical communication network, each ROADM on the transmission path may be powered on, and then the insertion loss of each ROADM is calibrated by a calibration optical signal, and a specific calibration process is shown in the above method embodiment, which is not described herein.

Scene 2

In the application scenario, when each ROADM acquires that the insertion loss of any channel of any dimension is within the alarm range, the control plane or the network management device of the ROADM can generate alarm information, and the abnormal channel in the ROADM can be determined through the alarm information, so that the fault positioning efficiency is improved, and the fault troubleshooting precision is improved.

The application scenario does not limit the alarm range, and as long as the insertion loss is within the alarm range, it indicates that the optical fiber is broken, the device is damaged, and the optical fiber or the device is dirty, for example, the alarm range is greater than or equal to 0dB and less than or equal to 10dB, and for example, the alarm range is greater than or equal to 20dB.

Optionally, each ROADM may periodically perform the calibration procedure of the insertion loss shown in this application, so as to achieve the purpose of periodically detecting the insertion loss of each ROADM.

Optionally, in the calibration process of loss of each ROADM, each ROADM may delete scheduling of the calibrated optical signal, so that the calibrated optical signal is not transmitted to the target dimension of the local ROADM, and each ROADM recovers transmission of the local optical signal.

Scene 3

With reference to fig. 11, the present scenario takes an example that the method shown in the present embodiment is applied to an Automatic Switched Optical Network (ASON) network as follows:

as shown in fig. 11, the ASON network includes a plurality of ROADMs, a first ROADM1101 for generating a service optical signal, and a non-ROADM 1102 for receiving and processing the service optical signal.

Specifically, the service optical signal from the first ROADM1101 is transmitted along the transmission path 1103, and details of the specific description of the transmission path 1103 are shown in fig. 3 and are not described in detail. If the service optical signal transmitted along the transmission path 1103 fails to be successfully transmitted, for example, the service optical signal cannot be received at a non-ROADM 1102, rerouting needs to be performed on the transmission path of the service optical signal, in order to avoid a situation that the service optical signal cannot be successfully transmitted to the non-ROADM 1102 after rerouting the service optical signal, calibration of insertion loss may be performed on a transmission path 1104 and a transmission path 1105 as shown in fig. 11 for two other transmission paths in the ASON network, where the service optical signal can be transmitted from a first ROADM1101 to the non-ROADM 1102, and for descriptions of the transmission path 1104 and the transmission path 1105, please refer to descriptions of the transmission path 1103 specifically, and details are not described herein.

The network management device may determine a transmission path capable of successfully transmitting the service optical signal to the non-ROADM 1102 based on the insertion loss of each ROADM in the transmission path 1104 and the insertion loss of each ROADM in the transmission path 1105. For example, taking the transmission path 1104 as an example, if the output power value of the calibration optical signal can be detected in each ROADM included in the transmission path 1104, it indicates that the transmission path 1104 can successfully transmit the service optical signal to the non-ROADM 1102.

Optionally, if there are multiple transmission paths capable of successfully transmitting the service optical signal to the ROADM1102, the network management device may select, in the multiple transmission paths, a subsequent transmission path for transmitting the service optical signal according to a parameter of each transmission path, where the parameter may be an OSNR, a time delay, a packet loss rate, and the like. Therefore, when the application scene shows that the service optical signals are rerouted, the transmission path can be selected according to various parameters, and the performance of transmitting the subsequent service optical signals is effectively improved.

The foregoing describes a flow of the method for calibrating insertion loss provided in this application, and the following describes a network device provided in this application in detail based on the foregoing method for calibrating insertion loss. Fig. 12 is a schematic structural diagram of a network device provided in the present application, where the network device may include:

an obtaining unit 1201, configured to obtain an input power value and an output power value of a calibration optical signal, where the input power value is a power value of the calibration optical signal obtained at an input port of a network device, the output power value is a power value of the calibration optical signal obtained at an output port of the network device, and the calibration optical signal is an optical signal not carrying a service;

a processing unit 1202, configured to obtain an insertion loss according to the input power value and the output power value, where the insertion loss is a power loss generated between the input port and the output port.

Optionally, the processing unit 1202 is further configured to: and acquiring a target attenuation value according to the insertion loss, wherein the target attenuation value is used for adjusting a target power value output by the optical signal from the output port, and the target attenuation value is an attenuation value between the transmission of the calibration optical signal from the input port to the output port.

Optionally, the calibration optical signal comes from an upstream network device, so that the calibration optical signal is transmitted from the input port to the output port. Optionally, the calibration optical signal is generated by a service board in the network device.

Optionally, the processing unit 1202 is specifically configured to: acquiring an initial attenuation value, wherein the initial attenuation value is an attenuation value in a state that the output power value is acquired on the output port; determining that the insertion loss is equal to a difference between a first power difference value and the initial attenuation value, the first power difference value being a difference between the input power value and the output power value.

Optionally, the processing unit 1202 is specifically configured to: and acquiring the target attenuation value, wherein the target attenuation value is a difference value between a second power difference value and the insertion loss, and the second power difference value is a difference value between the input power value and the target power value.

Optionally, the network device further includes a first blocking unit 1203, configured to block transmission of a local optical signal, where a wavelength of the local optical signal is equal to a wavelength of the calibration optical signal, and the local optical signal is an optical signal that is not carrying a service and is generated by the network device.

Optionally, the network device further includes a second blocking unit 1204, configured to block transmission of the calibration optical signal, where a wavelength of the calibration optical signal is equal to a wavelength of a service optical signal, and a power of the service optical signal at the output port is the target power value.

Optionally, the network device further includes a transceiver 1205, specifically configured to: sending a request message to an upstream network device, wherein the request message is used for requesting to confirm whether the upstream network device has the capability of sending the calibration optical signal; receiving an indication message from the upstream network device, where the indication message is used to indicate that the upstream network device has a capability of sending the calibration optical signal.

Optionally, the processing unit 1202 is further configured to: and if the modulation mode of the optical signal from the upstream network equipment is a target modulation mode, determining that the optical signal is the calibration optical signal, wherein the target modulation mode is a modulation mode corresponding to the calibration optical signal.

Optionally, the processing unit 1202 is further configured to: adjusting the attenuation value corresponding to the calibration optical signal to a maximum value; and gradually reducing the attenuation value corresponding to the calibration optical signal until the output power value is obtained on the output port.

Optionally, the input port is any one of a plurality of input ports of the network device, and the output port is any one of a plurality of output ports of the network device.

Fig. 13 is a schematic structural diagram of a network device provided in the present application. The network device may include a processor 1301, a memory 1302, and a transceiver 1303. The processor 1301, the memory 1302, and the transceiver 1303 are interconnected by wires. Wherein program instructions and data are stored in memory 1302.

The memory 1302 stores program instructions and data corresponding to the steps executed by the network device in the embodiments corresponding to fig. 7, 8, 9, and 10. Processor 1301 is configured to perform the steps related to the processing performed by the network device as shown in any of the embodiments of fig. 7, 8, 9 and 10. In the embodiment shown in fig. 7, the transceiver 1303 is configured to perform step 801, to receive an indication message, and to perform step 704. The processor 1301 is configured to perform steps 703, 705 to 709. In the embodiment shown in fig. 8, the transceiver 1303 is configured to perform step 901, to receive an indication message, and to perform step 904. Processor 1301 is configured to perform step 903, step 905 to step 912. In the embodiment shown in fig. 10, the transceiver 1303 is used to perform step 1001 and step 1004. Processor 1301 is configured to perform step 1003.

The embodiment of the application also provides a digital processing chip. Integrated with circuitry and one or more interfaces to implement the functionality of the processor 1301 described above. When integrated with memory, the digital processing chip may perform the method steps of any one or more of the preceding embodiments. When the digital processing chip is not integrated with the memory, the digital processing chip can be connected with the external memory through an interface. The digital processing chip implements the actions performed by the sending device or the receiving device in the above embodiments according to the program codes stored in the external memory.

The above description is only for the specific embodiments of the present application, but the scope of the present application 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 application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of calibrating insertion loss, the method comprising:

acquiring an input power value and an output power value of a calibration optical signal, where the input power value is a power value of the calibration optical signal acquired at an input port of a network device, the output power value is a power value of the calibration optical signal acquired at an output port of the network device, and the calibration optical signal is an optical signal not carrying a service;

obtaining an insertion loss according to the input power value and the output power value, wherein the insertion loss is a power loss generated between the input port and the output port;

the method further comprises the following steps:

and blocking transmission of a local optical signal, where a wavelength of the local optical signal is equal to a wavelength of the calibration optical signal, and the local optical signal is an optical signal of an unsupported service generated by the network device.

2. The method of claim 1, wherein after obtaining the insertion loss based on the input power value and the output power value, the method further comprises:

and acquiring a target attenuation value according to the insertion loss, wherein the target attenuation value is used for adjusting a target power value output by the optical signal from the output port.

3. The method of claim 1 or 2, wherein the calibration optical signal is from an upstream network device, such that the calibration optical signal is transmitted from the input port to the output port.

4. A method according to claim 1 or 2, wherein the scaled optical signal is generated by the network device.

5. The method of claim 1 or 2, wherein the obtaining the insertion loss based on the input power value and the output power value comprises:

acquiring an initial attenuation value, wherein the initial attenuation value is an attenuation value in a state that the output power value is acquired on the output port;

determining that the insertion loss is equal to a difference between a first power difference value and the initial attenuation value, the first power difference value being a difference between the input power value and the output power value.

6. The method of claim 2, wherein obtaining a target attenuation value based on the insertion loss comprises:

and acquiring the target attenuation value, wherein the target attenuation value is a difference value between a second power difference value and the insertion loss, and the second power difference value is a difference value between the input power value and the target power value.

7. The method of claim 2, wherein after obtaining a target attenuation value based on the insertion loss, the method further comprises:

and blocking the transmission of the calibration optical signal, wherein the wavelength of the calibration optical signal is equal to the wavelength of the service optical signal, and the power of the service optical signal on the output port is the target power value.

8. The method of claim 3, further comprising:

sending a request message to an upstream network device, wherein the request message is used for requesting to confirm whether the upstream network device has the capability of sending the calibration optical signal;

receiving an indication message from the upstream network device, where the indication message is used to indicate that the upstream network device has a capability of sending the calibration optical signal.

9. The method of claim 3, wherein before obtaining the input power value and the output power value of the calibration optical signal, the method further comprises:

and if the modulation mode of the optical signal from the upstream network equipment is a target modulation mode, determining that the optical signal is the calibration optical signal, wherein the target modulation mode is a modulation mode corresponding to the calibration optical signal.

10. The method according to claim 1 or 2, characterized in that the method further comprises:

adjusting the attenuation value corresponding to the calibration optical signal to a maximum value;

and gradually reducing the attenuation value corresponding to the calibration optical signal until the output power value is obtained on the output port.

11. The method according to claim 1 or 2, wherein the input port is any one of a plurality of input ports of the network device, and the output port is any one of a plurality of output ports of the network device.

12. A network device, characterized in that the network device comprises:

an obtaining unit, configured to obtain an input power value and an output power value of a calibration optical signal, where the input power value is a power value of the calibration optical signal obtained at an input port of a network device, the output power value is a power value of the calibration optical signal obtained at an output port of the network device, and the calibration optical signal is an optical signal that does not carry a service;

the processing unit is used for acquiring insertion loss according to the input power value and the output power value, wherein the insertion loss is power loss generated between the input port and the output port;

the network device further includes:

a first blocking unit, configured to block transmission of a local optical signal, where a wavelength of the local optical signal is equal to a wavelength of the calibration optical signal, and the local optical signal is an optical signal that is generated by the network device and does not carry a service.

13. The network device of claim 12, wherein the processing unit is further configured to:

14. The network device of claim 12 or 13, wherein the calibration optical signal is from an upstream network device, such that the calibration optical signal is transmitted from the input port to the output port.

15. The network device of claim 12 or 13, wherein the scaled optical signal is generated by the network device.

16. The network device according to claim 12 or 13, wherein the processing unit is specifically configured to:

17. The network device according to claim 13, wherein the processing unit is specifically configured to:

and acquiring the target attenuation value, wherein the target attenuation value is the difference between a second power difference value and the insertion loss, and the second power difference value is the difference between the input power value and the target power value.

18. The network device of claim 13, wherein the network device further comprises:

a second blocking unit, configured to block transmission of the calibration optical signal, where a wavelength of the calibration optical signal is equal to a wavelength of a service optical signal, and a power of the service optical signal at the output port is a target power value.

19. The network device according to claim 14, wherein the network device further comprises a transceiver unit, specifically configured to:

20. The network device of claim 14, wherein the processing unit is further configured to:

21. The network device of claim 12 or 13, wherein the processing unit is further configured to:

22. The network device according to claim 12 or 13, wherein the input port is any one of a plurality of input ports of the network device, and the output port is any one of a plurality of output ports of the network device.

23. A network device, comprising: a processor and a memory;

the memory and the processor are interconnected by a line, the memory having stored therein instructions, the processor being configured to perform the method of calibrating insertion loss according to any one of claims 1 to 11.

24. A readable storage medium comprising instructions that, when executed on an apparatus, cause the apparatus to perform the method of any one of claims 1-11.