CN113497651B - Method for calibrating insertion loss and related equipment - Google Patents

Abstract

Embodiments of the present invention disclose a method for calibrating insertion loss and related equipment. The efficiency and accuracy of calibrating the insertion loss can be effectively improved. The method includes: acquiring an input power value and an output power value of a calibrated optical signal, where the input power value is a power value of the calibrated optical signal obtained on an input port of a network device, and the output power value is an output power value of the network device The power value of the calibrated optical signal obtained on the port, the calibrated optical signal is an optical signal that does not carry services; the insertion loss is obtained according to the input power value and the output power value, and the insertion loss is the difference between the input port and the output port. the power loss generated between.

Description

A method for calibrating insertion loss and related equipment

technical field

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

Background technique

When the optical signal is transmitted in the reconfigurable optical add drop multiplexer (ROADM), the attenuation value of the wavelength selective switch (WSS) needs to be adjusted in the ROADM, so as to realize the transmission of the optical signal from the ROADM. Adjustment of output power.

During the transmission of the optical signal in the ROADM, the power of the optical signal will be lost due to the optical fibers and devices in the ROADM, and the power loss can be hedged by adjusting the attenuation value of the WSS. In the prior art, the specific value of the power loss is a parameter that has been set in the factory.

Because the power loss generated by the ROADM during the transmission of optical signals with different wavelengths is different, and the power loss generated by the ROADM for the optical signals transmitted along different transmission paths is also different, and the factory-set power loss The actual power loss of optical signals of different wavelengths and the optical signals transmitted along different transmission paths cannot be accurately distinguished. It can be seen that the power loss obtained by the prior art is inaccurate.

SUMMARY OF THE INVENTION

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

In a first aspect, the present application provides a method for calibrating insertion loss, the method comprising: a network device acquiring an input power value and an output power value of a calibrated optical signal, the input power value being the calibration obtained on an input port of the network device The power value of the optical signal, the output power value is the power value of the calibrated optical signal obtained on the output port of the network device, and the calibrated optical signal is an optical signal that does not carry services; the network device is based on the input power value and the The output power value captures the insertion loss, which is the 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 insertion loss provided by the present application can accurately distinguish between calibration optical signals with different wavelengths and calibration optical signals transmitted along different transmission paths in network equipment. The insertion loss in the network equipment is effectively This greatly improves the accuracy of determining the insertion loss of the calibrated optical signal. The precise adjustment of the output power of the service optical signal can be effectively realized based on the precise insertion loss.

In a possible implementation manner, 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, where the target attenuation value is used to adjust The target power value of the optical signal output from this output port.

It can be seen that the target attenuation value may be the attenuation value between the service optical signal or the calibration optical signal transmitted from the input port to the output port. Based on the obtained insertion loss of the calibrated optical signal, the insertion loss of the service optical signal having the same wavelength as the calibrated 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 of the service optical signal output from the output port is adjusted based on the insertion loss of the calibrated optical signal, which improves the accuracy and efficiency of power adjustment.

In a possible implementation manner, the calibration optical signal comes from an upstream network device, so that the calibration optical signal is transparently transmitted from the input port to the output port.

It can be seen that the network device can calibrate the insertion loss based on the calibration optical signal received from the upstream network, and in order to achieve accurate calibration of the insertion loss, the calibrated optical signal needs to be transparently transmitted from the input port of the network device to the output port, so that the The network device can accurately obtain the insertion loss between the input port and the output port.

In a possible implementation manner, the calibration optical signal is generated by the network device.

In a possible implementation manner, the obtaining of the insertion loss by the network device according to the input power value and the output power value includes: obtaining an initial attenuation value by the network device, where the initial attenuation value is the difference between the output power value obtained on the output port The attenuation value in the state; the network device determines that the insertion loss is equal to the difference between the first power difference value and the initial attenuation value, and the first power difference value is the difference between the input power value and the output power value. .

In a possible implementation manner, acquiring the target attenuation value by the network device according to the insertion loss includes: acquiring the target attenuation value by the network device, where the target attenuation value is a difference between the second power difference and the insertion loss, the The second power difference is the difference between the input power value and the target power value.

It can be seen that the network device obtains the target attenuation value based on the insertion loss, and based on the target attenuation value, the service data can be output from the output port of the network device at the target power value, effectively realizing the precise adjustment of the output power value of the service data.

In a possible implementation manner, the method further includes: the network device blocks the transmission of a local optical signal, the wavelength of the local optical signal is equal to the wavelength of the calibrated optical signal, and the local optical signal is an unloaded service generated by the network device light signal.

It can be seen that before the network device transmits the calibration optical signal, it needs to block the local optical signal with the same transmission path and the same wavelength as the calibration optical signal, so that the calibration optical signal is transmitted in the network device to avoid the local optical signal with the same wavelength and the conflict between the calibration optical signal.

In a possible implementation manner, 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 obtains the service optical signal, it will block the calibrated optical signal that is transmitted along the same path and has the same wavelength as the service optical signal in the network device, so that the network device can only obtain the service at the output port. The output power value of the optical signal avoids the conflict between the service optical signal and the calibrated optical signal on 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 calibrated optical signal. The purpose of precisely adjusting the output power value of the service optical signal is achieved, and the efficiency of adjusting the output power value of the service optical signal is effectively improved.

In a possible implementation manner, the method further includes: the network device sends 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 ability to send the calibrated optical signal; the network device receives data from the upstream network device. An indication message of the upstream network device, where the indication message is used to indicate that the upstream network device has the ability to send the calibrated optical signal.

It can be seen that the network device will perform the insertion loss calibration process only when it is determined that the upstream network device has the ability to send calibrated optical signals, which effectively improves the success rate of insertion loss calibration for the network device.

In a possible implementation manner, before the network device acquires the input power value and the output power value of the calibrated 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 the optical signal The signal is the calibration optical signal, and the target modulation mode is the modulation mode corresponding to the calibration optical signal.

It can be seen that the network device can accurately distinguish whether the received optical signal is a calibration optical signal or a service optical signal through the target modulation method.

In a possible implementation manner, the method further includes: the network device adjusts the attenuation value corresponding to the calibrated optical signal to a maximum value; the network device gradually reduces the attenuation value corresponding to the calibrated optical signal until the output port is on the output port. Obtain the output power value.

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

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

It can be seen that the network equipment can calibrate the insertion loss during the transmission of the calibrated optical signal along any transmission path in the network equipment. Different transmission paths refer to the combination of different input ports and different output ports of the network equipment. .

In a second aspect, the present application provides a network device, the network device includes: an acquisition unit configured to acquire an input power value and an output power value of a calibrated optical signal, where the input power value is acquired on an input port of the network device The power value of the calibrated optical signal, the output power value is the power value of the calibrated optical signal obtained on the output port of the network device, and the calibrated optical signal is an optical signal that does not carry services; the processing unit is used for according to the The input power value and the output power value obtain the insertion loss, which is the power loss generated between the input port and the output port. For the description of the beneficial effects shown in this aspect, please refer to the above-mentioned first aspect for details, which will not be repeated.

In a possible implementation manner, the processing unit is further configured to: obtain a target attenuation value according to the insertion loss, where the target attenuation value is used to adjust the target power value of the optical signal output from the output port.

In a possible implementation manner, the calibration optical signal comes from an upstream network device, so that the calibration optical signal is transparently transmitted from the input port to the output port.

In a possible implementation manner, the calibration optical signal is generated by the network device.

In a possible implementation manner, the processing unit is specifically configured to: acquire an initial attenuation value, where the initial attenuation value is an attenuation value in a state where the output power value is acquired on the output port; determine that the insertion loss is equal to the first A difference between a power difference value and the initial attenuation value, the first power difference value is a difference value between the input power value and the output power value.

In a possible implementation manner, the processing unit is specifically configured to: acquire the target attenuation value, where the target attenuation value is a difference between a second power difference value and the insertion loss, and the second power difference value is the Enter the difference between the power value and this target power value.

In a possible implementation manner, the network device device further includes: a first blocking unit, configured to block the transmission of a local optical signal, the wavelength of the local optical signal is equal to the wavelength of the calibration optical signal, and the local optical signal is the An optical signal generated by a network device that does not carry services.

In a possible implementation manner, the network equipment device further includes: a second blocking unit, configured to block 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 service optical signal is in the The power on the output port is the target power value.

In a possible implementation manner, the network device device further includes a transceiver unit, which is specifically configured to: send a request message to the upstream network device, where the request message is used to request to confirm whether the upstream network device has the ability to send the calibrated optical signal ; Receive an indication message from the upstream network device, where the indication message is used to indicate that the upstream network device has the ability to send the calibrated optical signal.

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

In a possible implementation manner, the processing unit is further configured to: adjust the attenuation value corresponding to the calibration optical signal to a maximum value; and gradually decrease the attenuation value corresponding to the calibration optical signal until the output port obtains the output power value.

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

In a third aspect, the present application provides a network device, including: a processor and a memory; the memory and the processor are interconnected through a line, and instructions are stored in the memory, and the processor is configured to execute any one of the above-mentioned first aspects The method shown for calibrating insertion loss.

In a fourth aspect, an embodiment of the present application provides a digital processing chip, the chip includes a processor and a memory, the memory and the processor are interconnected through a line, and instructions are stored in the memory, and the processor is used to execute any one of the above-mentioned first aspects. The processing-related functionality in the method.

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 according to any one of the above-mentioned first aspects.

In a sixth aspect, the present application provides a program product containing instructions, which, when the instructions are run on a device, cause the device to perform the method according to any one of the above-mentioned first aspects.

Description of drawings

FIG. 1 is a schematic structural diagram of an optical communication network provided by the application;

FIG. 2 is a schematic structural diagram of any network domain included in the optical communication network provided by the application;

FIG. 3 is an exemplary diagram of a transmission path for transmitting an optical signal provided by the application;

Fig. 4 is the first kind of structure example diagram of ROADM provided by this application;

Fig. 5 is the second kind of structure example diagram of ROADM provided by this application;

Fig. 6 is the third structural example diagram of ROADM provided by this application;

FIG. 7 is an example flow chart of the first embodiment of the calibration insertion loss provided by the application;

FIG. 8 is an example flow chart of the second embodiment of the calibration insertion loss provided by the application;

FIG. 9 is an example flow chart of the third embodiment of the calibration insertion loss provided by the present application;

FIG. 10 is an example flow chart of the fourth embodiment of the calibration insertion loss provided by the application;

Fig. 11 is a kind of structural example diagram of the automatic switching optical network provided by the application;

12 is a schematic structural diagram of a first network device provided by the application;

FIG. 13 is a schematic structural diagram of a second type of network device provided by this application.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts 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 by the present application is applied will be described with reference to FIG. 1 . The optical communication network shown in this embodiment includes multiple network domains. For example, the optical communication network 100 shown in FIG. 1 includes five network domains, namely the network domain 101, the network domain 102, the network domain 103, the network domain The domain 104 and the network domain 105, this embodiment does not limit the number of network domains included in the optical communication network. Wherein, the network domain refers to a network laid out in a local geographic scope, and the network domain can be connected with a distant network domain to form a network covering a larger geographic scope.

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

The structure of any network domain included in the optical communication network shown in FIG. 1 will be described below with reference to FIG. 2. Specifically, FIG. 2 shows the structure of the network domain 101. For the description of the specific structures of other included network domains, please refer to the description of the structure of the network domain 101 shown in this embodiment, and details will not be repeated.

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 ( fixed optical add drop multiplexer, FOADM) or ROADM. This embodiment is exemplified by taking that the network device is a ROADM as an example. As shown in FIG. 2 , the network domain 101 includes five ROADMs, namely ROADM201 , ROADM202 , ROADM203 , ROADM204 , and ROADM205 as an example for illustration. It should be clear that the number of ROADMs included in the network domain 101 is not specified in this embodiment. limited.

The network domain 101 also includes an optical fiber connected between two ROADMs. Taking ROADM201 and ROADM202 as an example, the network domain 101 also includes an optical fiber 210 connected between the ROADM201 and ROADM202. In this embodiment, the network domain 101 includes an optical fiber 210. The connection relationship between multiple ROADMs is not limited. At least part of the ROADMs included in the network domain 101 may have optical fibers connected to other adjacent network domains, for example, the optical fibers 220 of the ROADM 202 shown in FIG. 2 are used to connect with the network domain 103 (as shown in FIG. ).

The transmission path of the service optical signal will be described below with reference to FIG. 3. The transmission path shown in FIG. 3 includes the first ROADM 301 and the second ROADM 302, wherein the first ROADM 301 is used to send the service optical signal generated by the customer equipment A or locally to the end ROADM 301. ROADM302, the last ROADM302 receives the service optical signal from the first ROADM201, and forwards it to the client device B directly or after demodulation.

Optionally, the first ROADM 301 can directly send the generated service optical signal to the non-ROADM 302, and optionally, the first ROADM 301 can also forward the service optical signal to the non-ROADM 302 via one or more intermediate ROADMs. This embodiment Taking the forwarding of the first ROADM 301 via three intermediate ROADMs as an example to send the service optical signal to the non-ROADM 302 as an example, it can be seen that the service optical signal generated by the first ROADM 301 shown in FIG. The intermediate ROADM305 forwards the service optical signal to the non-ROADM302. It should be clear that each ROADM shown in this embodiment (ie, the first ROADM, the middle ROADM, and the non-ROADM) may be located in the same network domain or in different network domains, which is not specifically limited in this embodiment.

The structure of the first ROADM 301 in the transmission path of the service optical signal will be described below with reference to FIG. 4 :

The first ROADM 301 shown in FIG. 4 includes one or more service veneers, such as the service veneer 410 and the service veneer 411 shown in FIG. 4 , and the specific number of the service veneers included in the first ROADM 301 is not limited in this embodiment. , the service single board is used to generate a service optical signal, specifically, the service optical signal refers to an optical signal bearing a service. A first WSS 402 , a second WSS 403 , an optical amplifier 404 and an optical fiber transmission path interface unit (FIU) 405 are sequentially connected to the service single board 410 and the service single board 411 through optical fibers. Among them, the FIU405 is used to detect the spectrum and optical performance of the service optical signal without interrupting the transmission of the service optical signal.

This embodiment does not limit the number of WSSs included in the first ROADM 301 , and the multiple WSSs included in the first ROADM 301 are located at different locations. The first ROADM301 is used to realize the scheduling of N dimensions of the optical signal. In order to realize the purpose that the service optical signal can be transmitted along the transmission path shown in FIG. 2, the first ROADM301 needs to perform the target dimension scheduling of the service optical signal. The target dimension is one of the N dimensions, and N is a positive integer greater than or equal to 1. In different dimensions, including different combinations of WSS. It can be seen that if the transmission paths of the service optical signals are different, the target dimensions that the service optical signals pass through in the first ROADM 301 are different. The following is the description of the target dimensions included in the first ROADM 301:

The target dimension includes at least a first WSS 402 and a second WSS 403 , optionally, the target dimension may further include one or more WSSs connected between the first WSS 402 and the second WSS 403 , and/or include a connection between the first WSS 402 and devices such as optical amplifiers between the second WSS 403, which are not specifically limited in this embodiment. In this embodiment, the first WSS 402 and the second WSS 403 are directly connected by an optical fiber as an example to illustrate:

Specifically, the first WSS 402 receives the service optical signal from the service board 411, the service optical signal is transmitted along the first transmission direction, and the first WSS 402 sends the redirected service optical signal to the second WSS 403 via the optical fiber , the second WSS403 redirects the service optical signal to realize the scheduling of the service optical signal from the first transmission direction to the second transmission direction, the second WSS403 sends the service optical signal to the optical amplifier 404, the The optical amplifier 404 amplifies the service optical signal and sends it to the FIU 405 , and the service optical signal is output from the first ROADM 301 via the FIU 405 for transmission to the downstream intermediate ROADM 303 (as shown in FIG. 3 ).

The structure of the intermediate ROADM is described below in conjunction with Figure 5, taking the intermediate ROADM303 as an example:

In order to achieve the purpose that the service optical signal can be transmitted along the transmission path shown in Figure 3, the intermediate ROADM303 needs to perform target dimension scheduling on the service optical signal. For the description of the target dimension, please refer to the description of the purpose dimension of the first ROADM301. I won't go into details. The target dimension of the intermediate ROADM 303 includes a first FIU 501 , a first optical amplifier 502 , a first WSS 503 , a second WSS 504 , a second optical amplifier 505 and a second FIU 506 . The service optical signal from the upstream first ROADM 301 is sequentially transmitted to the second FIU 506 via the first FIU 501, the first optical amplifier 502, the first WSS 503, the second WSS 504, and the second optical amplifier 505, and the service optical signal via the second FIU 506 from the The intermediate ROADM303 outputs for transmission to the downstream intermediate ROADM304 (as shown in Figure 3). Wherein, one or more devices may also be connected between the first WSS 503 and the second WSS 504 . For specific description, please refer to the description of the first ROADM 301 , which will not be repeated. For the description of each device included in the middle ROADM303, please refer to the description of the first ROADM301, without repeating it. 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 ROADM 303 for details.

The structure of ROADM302 is described below in conjunction with Figure 6:

In order to realize that the service optical signal can be transmitted to the service board included in the ROADM 302 , the ROADM 302 shown in this embodiment includes the FIU 601 , the optical amplifier 602 , the first WSS 603 , the second WSS 604 and the service board 605 . The service optical signal from the upstream intermediate ROADM 305 is sequentially transmitted to the service single board 605 via the FIU 601, the optical amplifier 602, the first WSS 603, and the second WSS 604, wherein one or more of the first WSS 603 and the second WSS 604 can also be connected. For specific instructions, please refer to the description of the first ROADM301, and will not repeat them. 3 to 6, it can be seen that the service optical signal from the service single board 410 of the first ROADM 301 passes through the intermediate ROADM 303, the intermediate ROADM 304 and the intermediate ROADM 305 in sequence to be transmitted to the service single board 605 without the ROADM 302. For the description of each device, please refer to the description of ROADM301 first, without repeating it.

The optical communication network shown above is an analog system, and insertion loss will occur during the transmission of the optical signal inside the ROADM. Moreover, in the optical communication network, if the optical signal is transmitted along different transmission paths, the optical signal will not be transmitted during the transmission. Different insertion losses will be generated during the process, and different insertion losses will also be generated during the transmission of optical signals with different wavelengths along the same transmission path. The method for calibrating insertion loss provided by this application is used to calibrate the insertion loss generated during the transmission of an optical signal of a specific wavelength in a specific ROADM, thereby improving the accuracy of the obtained power loss. The following is first with reference to Figure 7 The flow of the local ROADM performing insertion loss calibration is described as shown in the figure: the local ROADM shown in this embodiment is a ROADM on the transmission path shown in FIG. 3 .

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

The following first describes the conditions for triggering the local ROADM to perform the insertion loss calibration process shown in this embodiment:

Condition 1

After the local ROADM is powered on, the local ROADM automatically performs the insertion loss calibration process.

Condition 2

The local ROADM can be configured with a calibration period, and the local ROADM can periodically perform a calibration insertion loss process on the local ROADM based on the calibration period.

Condition 3

The local ROADM receives the test message from the network management device, and the test message is used to indicate that the local ROADM needs to perform the procedure of calibrating the insertion loss. For example, if the network management device determines that the transmission path shown in FIG. 3 needs to transmit service optical signals, the network management device can send the test information to one or more ROADMs on the transmission path to calibrate the insertion loss of each ROADM on the transmission path .

The execution subject for executing this step is described below. For example, the execution subject may be a control plane located in the local ROADM. In this embodiment, the control plane is located on an independent board in the local ROADM as an example. For another example, the execution subject may be a network management device in an optical communication network, and the network management device is connected to the control plane of one or more ROADMs.

It should be clear that if the local ROADM is the non-first ROADM in the transmission path shown in FIG. 3 , then steps 701 to 702 shown in this embodiment are optional steps to be executed, wherein the non-first ROADM is the one shown in FIG. 3 . Either an intermediate ROADM or a non-ROADM in the transmission path shown.

If the ROADM performing the process shown in this embodiment is the first ROADM shown in FIG. 3 , step 703 is directly performed without performing steps 701 to 702 .

The request message is used to request to confirm whether the upstream network device has the ability to send a calibrated optical signal, and the local ROADM shown in this embodiment is used to perform the insertion loss calibration process according to the calibrated optical signal from the upstream ROADM. As shown in FIG. 3 , if the current ROADM performing insertion loss calibration is the intermediate ROADM 304 , the intermediate ROADM 304 sends a request message to the upstream ROADM 303 . If the local ROADM performing insertion loss calibration is the intermediate ROADM 303 , the intermediate ROADM 303 sends a request message to the upstream head ROADM 301 .

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

In this embodiment, when the upstream ROADM determines that it has the ability to send a calibrated optical signal, the upstream ROADM can send an indication message to the local ROADM. Specifically, if the upstream ROADM determines that a light source (LS) is configured on the upstream ROADM, an indication message is sent to the local ROADM. For example, the light source can be set in the upstream ROADM, and the light source can be split to each WSS of the upstream ROADM by the optical splitter. When the control plane of the upstream ROADM determines that the upstream ROADM can receive the light from the optical splitter, the light source can be sent to the local ROADM. Send instruction messages. The request message in step 701 and the instruction message in step 702 may be implemented through private protocols. Alternatively, each ROADM advertises to other ROADMs whether it has the ability to send a calibrated optical signal through the open shortest path first protocol (open shortest path first, OSPF), then the request message in step 701 and the instruction message in step 702 can be combined into one announcement information.

Step 703, the local ROADM determines the target dimension.

Optionally, by performing steps 701 to 702, the local ROADM will perform the insertion loss calibration process shown in the subsequent steps only when it is determined that the upstream ROADM has the ability to send a calibrated optical signal, which effectively improves the performance of the local ROADM. The success rate of insertion loss calibration.

The target dimension shown in this embodiment can be understood as a transmission path for the calibration optical signal to be transmitted in the local ROADM. Specifically, in the process of calibrating the insertion loss of the local ROADM, first, the target dimension to be calibrated is determined among the N dimensions supported by the local ROADM. The target dimension shown in this embodiment is the N dimensions supported by the local ROADM. In any of these dimensions, if different optical signals are transmitted along different dimensions of the local ROADM, then different optical signals are transmitted along different transmission paths in the optical communication network. For the description of the transmission paths, please refer to As shown in FIG. 3 , details are not repeated.

Several optional ways for the local ROADM to determine the target dimension are exemplified as follows:

way 1

Among the N dimensions supported by the local ROADM, the local ROADM rotates to determine the target dimension. Specifically, the local ROADM first determines the first dimension in the N dimensions as the target dimension, where different dimensions refer to the local ROADM. Different combinations of input ports and output ports are included. After the process of calibrating insertion loss shown in this embodiment is performed on the target dimension, the local ROADM determines the second dimension in the N dimensions as the target dimension, until the local ROADM determines the Nth dimension in the N dimensions is the target dimension. This method is exemplified by the local ROADM determining the target dimension in N dimensions in a round-robin manner. In other examples, the local ROADM may also determine the target dimension in N dimensions in a random manner.

way 2

In the N dimensions of the local ROADM, the local ROADM simultaneously determines M dimensions as target dimensions, so that the local ROADM can simultaneously perform the process of calibrating the insertion loss shown in this embodiment for the M target dimensions, so as to improve the calibration of the local ROADM Insertion loss efficiency, 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-type ROADM demultiplexing unit (ROADM demultiplexing unit, RDU), then the target dimensions shown in this embodiment are multiple. Specifically, the local ROADM has multiple In the case of input ports and multiple output ports, the local ROADM selects one input port among the multiple input ports, and the input port and each output port of the local ROADM are formed for insertion loss. Calibration target dimension.

Step 704, the local ROADM acquires the calibration optical signal.

The following first describes the source of the calibration optical signal:

In the transmission path of the local ROADM as shown in Figure 3, the different network locations will cause the local ROADM to obtain different sources of the calibrated optical signal, as shown below:

Type 1

If the local ROADM is the non-leading ROADM in the transmission path shown in FIG. 3 , the local ROADM receives the calibrated optical signal from the upstream ROADM. For the description of the non-leading ROADM, please refer to the above description, and details are not repeated.

Specifically, the calibration optical signal used to calibrate the insertion loss of the local ROADM comes from the upstream ROADM, for example, the light source set by the upstream ROADM can send the calibration optical signal to the local ROADM. This embodiment does not limit the timing at which the upstream ROADM sends the calibration optical signal to the local ROADM, as long as the upstream ROADM sends the service optical signal to the local ROADM before sending the calibration optical signal to the local ROADM, where the calibration optical signal and the local ROADM are sufficient. The service optical signal is 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 from the service single 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 the variable optical attenuator (VOA) corresponding to the calibration optical signal is adjusted to the target attenuation value through the calibration optical signal, so that the calibration optical signal can be transmitted from the local ROADM from the The power value output by the output port reaches the target power value. This embodiment does not limit the specific size of the target power value. The VOA corresponding to the calibrated optical signal is one of the multiple VOAs included in the local ROADM, which is used to adjust the The VOA of the attenuation value of the calibration optical signal, it can be seen that the target attenuation value adjusted by the VOA is the attenuation value between the calibration optical signal transmitted from the input port of the target dimension to the output port.

In this embodiment, both the calibration optical signal with the same wavelength and the service optical signal are transmitted along the target dimension in the local ROADM. If the target dimension of the local ROADM has transmitted the calibration optical signal, the local ROADM has acquired the target. attenuation value, 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 .

It can be seen that different target attenuation values are obtained by transmitting along the same target dimension and multi-channel calibration optical signals with different wavelengths, so as to realize the VOA corresponding to the multi-channel service optical signals transmitted along the target dimension and having different wavelengths precise adjustment of the attenuation value.

The content of the calibration optical signal is 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 the wavelength of the service optical signal.

In order to enable the local ROADM to obtain accurate target attenuation values for different service optical signals, the upstream ROADM can obtain multiple channels of calibrated optical signals with different wavelengths. For example, if the local ROADM transmits optical signals in the C-band, the wavelengths of the N-channel calibrated optical signals obtained by the local ROADM cover all possible wavelength values in the C-band. For another example, if the local ROADM transmits the optical signal in the L-band, the wavelengths of the N-channel calibration optical signals acquired by the current ROADM cover all possible wavelength values in the L-band. This embodiment does not limit the wavelength value of each calibration optical signal obtained by the local ROADM, as long as the local ROADM needs to transmit a service optical signal, the wavelength value of the service optical signal is equal to the wavelength value of N channels of calibration optical signals All the way in.

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 the service carried by the service optical signal, but only needs to have the same wavelength as the service optical signal, so that the service with the same wavelength The optical signal and the calibration optical signal can be transmitted along the same target dimension in the local ROADM.

The method of how the current ROADM determines that the obtained optical signal is a calibrated optical signal is explained again:

way 1

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

way 2

The optical signal received after the local ROADM is powered on is the calibration optical signal, so that the local ROADM first performs the insertion loss calibration process after the local ROADM is powered on.

way 3

The local ROADM determines the modulation mode of the received optical signal. If the local ROADM is a non-leading ROADM, the optical signal originates from the upstream ROADM. If the local ROADM is the primary ROADM, the optical signal originates from the local ROADM. For example, the source The service board for the local ROADM.

After the optical signal received by the local ROADM, the local ROADM determines the modulation mode of the optical signal, and the local ROADM pre-stores the target modulation mode, where the target modulation mode is the modulation mode corresponding to the calibration optical signal. It can be seen that if the local ROADM determines the modulation mode If 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.

This embodiment does not limit the specific modulation mode of the target modulation mode. For example, the target modulation mode is the top modulation mode, so that the peak position of the calibration optical signal and the peak position of the service optical signal are different, so that the local ROADM can adjust the peak position of the optical signal according to the optical signal. The calibration optical signal and the service optical signal can be distinguished by the peak position of the wave.

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 false optical signal. The local optical signal is generated by the light source of the local ROADM. For the description of the local light source, please refer to the above description of the light source of the upstream ROADM, and no further description will be given. . 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 optical signal is white light. The local optical signal is used to ensure that each channel of the target dimension of the local ROADM has optical signal transmission, thereby ensuring the balance of optical signal transmission.

For example, the target dimension of the local ROADM may include multiple channels, and different channels transmit optical signals with different wavelengths. Specifically, the target dimension includes 80 channels, and the 80 channels transmit optical signals with λ1, Optical signals from λ2 to λ80. The light source of the local ROADM generates local optical signals with λ1 to λ80. If the target dimension of the local ROADM is used to transmit service optical signals of λ1, λ2 to λ10, the local ROADM blocks the local optical signals with λ1, λ2 to λ10, so that all 80 channels included in the target dimension have optical signals to transmit. Among them, 10 channels are used for transmitting service optical signals with λ1, λ2 to λ10, and the other 70 channels are used for transmitting local optical signals with λ11 to λ80. It can be seen that the local optical signal effectively guarantees that each channel in the target dimension has optical signal transmission.

In this embodiment, before the calibration optical signal is transmitted 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, so that the Avoid collisions between local optical signals and calibration optical signals with the same wavelength. Optionally, the local optical signal can be blocked by adjusting the VOA for adjusting the attenuation value of the local optical signal to the maximum value.

For example, if the local ROADM determines that the wavelengths of the calibrated optical signals originating from the upstream ROADM or the service board are λ3 to λ80, respectively, the local ROADM blocks the local optical signals with wavelengths λ3 to λ80 generated by the local ROADM, so that the The channel for transmitting optical signals with λ3 to λ80 is no longer used to transmit local optical signals, but is used to transmit calibrated optical signals with wavelengths λ3 to λ80 generated from upstream receiving or service boards, effectively avoiding the need for The conflict between the calibration optical signal of the same wavelength and the local optical signal transmitted in the local ROADM, each calibration optical signal is input by the input port of the target dimension, and then output by the output port of the target dimension, so that the calibration optical signal obtained by the local ROADM , which can be transparently transmitted from the input port of the local ROADM to the output port.

Step 706: The local ROADM acquires the input power value of the calibration optical signal.

When the local ROADM obtains the calibration optical signal, the local ROADM can obtain the power value of the calibration optical signal on the input port of the local ROADM.

Taking the local ROADM as the intermediate ROADM shown in Figure 5 as an example, after the calibration optical signal enters the local ROADM, it will be transmitted to two or more WSSs for redirection. The input power value is obtained before the signal is transmitted to two or more WSSs.

For example, the local ROADM can obtain the input power value of the calibrated optical signal on the input port of the first FIU 501, and for another example, the local ROADM can obtain the input power value of the calibrated optical signal on the input port of the first optical amplifier 502, and for example, The local ROADM can obtain the input power value of the calibrated optical signal on the input port of the first WSS 503, and this embodiment is illustratively described by taking the input power value as the power value of the calibrated optical signal on the input port of the first optical amplifier 502 as an example .

Taking the local ROADM as the first ROADM shown in FIG. 4 as an example, the calibrated optical signal generated by the service single board 410 is transmitted to the first WSS 402 through the port of the service single board 410, and the port of the service single board 410 is used as the first WSS 402. If the input port is used, the local ROADM can obtain the input power value on the port of the service board 410 . For another example, the local ROADM may obtain the input power value of the calibrated optical signal on the input port of the first WSS 402 .

Taking the local ROADM as the non-ROADM shown in FIG. 5 as an example, the local ROADM can obtain the input power value of the calibrated optical signal on the input port of the FIU601. For another example, the local ROADM can obtain the calibration on the input port of the optical amplifier 602. The input power value of the optical signal, for another example, the local ROADM may obtain the input power value of the calibrated optical signal on the input port of the first WSS 603 .

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.

Continuing as shown in FIG. 5 , the local ROADM can obtain the output power value of the calibrated optical signal on the output port of the second WSS 504 , for another example, the local ROADM can obtain the output power value on the output port of the second optical amplifier 505 , another example , the local ROADM can obtain the output power value on the output port of the second FIU 506 . This embodiment is exemplified by taking the output power value as the power value of the calibrated optical signal on the output port of the second optical amplifier 505 as an example.

Continuing to take the example shown in FIG. 4, the local ROADM can obtain the output power value of the calibrated optical signal on the output port of the second WSS 403. For another example, the local ROADM can obtain the output power value on the output port of the optical amplifier 404, and again For example, the local ROADM can obtain the output power value on the output port of the FIU405.

Continuing to take the example shown in FIG. 6 , the local ROADM can obtain the output power value of the calibrated optical signal on the output port of the second WSS 604 . Optionally, if the local ROADM shown in this embodiment is a non-ROADM, after obtaining the output power value, the non-ROADM terminates the transmission of the calibration optical signal on the output port of the second WSS604. The calibration optical signal does not carry services. If the calibration optical signal is transmitted to the service board, it will cause interference and burden to the service board. In this embodiment, the calibration can be terminated after the output power value of the calibration optical signal is obtained. Transmission of optical signals, thereby avoiding the transmission of calibrated optical signals to service boards.

Step 708, the local ROADM obtains the insertion loss.

The insertion loss shown in this embodiment is the insertion loss generated between the input port and the output port. The following describes the process of calculating the insertion loss by the local ROADM in conjunction with Formula 1:

Formula 1 is: insertion loss=first power difference value-initial attenuation value, wherein the first power difference value=input power value-output power value, and the initial attenuation value is obtained by the local ROADM on the output port The attenuation value in the state of the output power value mentioned above, the formula 1 is described below with a specific example:

For example, if the input power value of the calibrated optical signal obtained by the local ROADM on the input port is 10dBm (decibel milliwatts), and the output power value of the calibrated optical signal obtained by the local ROADM on the output port is 4dB, then the first power difference is 10-4=6dB (decibel), the initial attenuation value of the VOA used to adjust the attenuation value during the transmission of the calibrated optical signal is 1dB, and the insertion loss of the local ROADM is 6-1=5dB. For a service optical signal with the same wavelength as the calibration optical signal, during the transmission process of the local ROADM along the target dimension, the insertion loss of the service optical signal is also an insertion loss with a value of 5dB.

It can be seen that, by using the method shown in this embodiment, the optical signal (such as a false optical signal) generated by the service single board from the upstream ROADM or the local ROADM that does not carry the service can be used as the calibration optical signal, so as to obtain the local optical signal of the service. The insertion loss in the process of ROADM transmission, so as to realize the calibration of the insertion loss of the service optical signal transmitted along different dimensions and with different wavelengths, because in the local ROADM, the service optical signal with the same wavelength and the calibration optical signal The transmission path is the same, and the local ROADM can obtain accurate insertion loss according to the calibration optical signal, which effectively improves the accuracy of the obtained insertion loss, effectively reduces the amount of manual operations in the calibration process, and effectively improves the acquisition rate. Insertion Loss Efficiency.

Step 709: The local ROADM obtains the target attenuation value according to the insertion loss.

First, the purpose of performing this step is explained:

In order to make the service optical signal output from the output port with the target power value, the local ROADM adjusts the attenuation value of the VOA to the target attenuation value. Specifically, the VOA is used to adjust the service optical signal to be transmitted from the input port to the output. From the VOA of the attenuation value between ports, it can be seen that when the attenuation value of the VOA is the target attenuation value, the service optical signal is output from the output port at the target power value.

Secondly, in order to realize that the service optical signal is output from the output port with the target power value, the function of the calibration optical signal is explained:

It can be seen from the above that the service optical signal and the calibration optical signal have the same wavelength and are transmitted along the same target dimension in the local ROADM, then the insertion loss of the service optical signal in the process of being transmitted from the input port to the output port is the same as that of the calibration optical signal. The insertion loss is the same when the signal is transmitted from the input port to the output port. It can be seen that if the local ROADM adjusts the attenuation values of the calibration optical signal and the service optical signal to the target attenuation value, the calibration optical signal and the service optical signal can be The target power value is output from the output port.

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

In this embodiment, the local ROADM can obtain the target attenuation value based on the insertion loss. Specifically, the local ROADM calculates the target attenuation value according to the following formula 2:

Formula 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 described below:

Case 1

The target power value may be a nominal power value, that is, a nominal power value of the same or approximately the same value is preset for each calibrated optical signal transmitted along the target dimension of the local ROADM, so that the signals transmitted along the target dimension have different values. The calibrated optical signal of the wavelength can be output from the output port at the nominal power value, which effectively improves the balance of the power values of the calibrated optical signals output from the output port.

Case 2

The target power value shown in this embodiment is any power value that is greater than or equal to the minimum power value. Specifically, if the target power value of the calibrated optical signal is greater than or equal to the minimum power value, the local ROADM will only detect it on the output port. In the calibration optical signal, if the target power value of the calibration optical signal is less than the minimum power value, the local ROADM will not be able to detect the calibration optical signal on the output port.

Case 3

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

It can be seen that the local ROADM shown in this embodiment calculates the target attenuation value based on the formula 2 shown above. When the input port of the local ROADM receives the service optical signal, the service optical signal and the calibration optical signal are in the local ROADM. Transmission is performed 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 used to adjust the attenuation value of the service optical signal to the target attenuation value, so that the The insertion loss of the service optical signal between the input port and the output port is the target attenuation value, so that the service optical signal can be output from the output port at the target power value.

This embodiment does not limit the conditions for the local ROADM to perform step 709. For example, after the local ROADM determines the insertion loss through step 708, step 709 is performed. For another example, after performing step 709, the local ROADM stores the insertion loss, and establishes a preset correspondence table. The preset correspondence table establishes the correspondence between the target dimension, the target wavelength, and the insertion loss, wherein the target wavelength is The wavelength of the calibration optical signal shown above, it can be seen that when the input port receives the service optical signal with the target wavelength, the local ROADM can determine the target dimension corresponding to the target wavelength based on the preset correspondence table and Insertion loss, the local ROADM can transmit the service optical signal along the target dimension, and the local ROADM also adjusts the attenuation value of the VOA as shown in step 709 to adjust the attenuation value of the VOA to the target attenuation value. It can be seen that the local ROADM can calculate the target attenuation value only when it is determined that the local ROADM obtains the service optical signal with the target wavelength, and the local ROADM does not need to calculate the target attenuation value of other calibrated optical signals with non-target wavelengths. calculation, thereby effectively reducing the computational load of the processor.

Using the method shown in this embodiment, the calibration optical signals with different wavelengths and the calibration optical signals transmitted along different target dimensions can be accurately distinguished, and the insertion loss in the local ROADM can effectively improve the determination of calibration optical signals. The accuracy of the insertion loss of the signal. The precise adjustment of the output power of the service optical signal can be effectively realized based on the precise insertion loss.

Because the calibration of the insertion loss of the target dimension is achieved by calibrating the optical signal, it can be seen that the local ROADM realizes the calibration of the insertion loss of multiple channels of the same target dimension through multi-channel calibration optical signals, and can simultaneously perform multiple target dimensions. The calibration of insertion loss effectively reduces the amount of manual operations and improves the calibration efficiency of insertion loss.

Figure 7 illustrates the process of calibrating the insertion loss of the local ROADM. The following describes how to realize the transmission of the service optical signal after the calibration process of the insertion loss of the local ROADM is completed with reference to Figure 8.

For the execution process of step 801 to step 809, please refer to step 701 to step 709 shown in FIG. 7 for details, and details are not repeated;

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

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

In the transmission path of the local ROADM as shown in Figure 3, different network locations will cause the local ROADM to obtain different sources of service optical signals, as shown below:

Type 1

If the local ROADM is the non-leading ROADM in the transmission path shown in FIG. 3 , the local ROADM receives the service optical signal from the upstream ROADM. For the description of the non-leading ROADM, please refer to the above description, and details are not repeated.

Type 2

If the local ROADM is the first ROADM in the transmission path shown in FIG. 3 , the local ROADM receives the service optical signal generated from the service single board in the local ROADM.

The number of service optical signals shown in this embodiment is not limited. For example, the input port of the local ROADM receives one or more service optical signals. For better description, this embodiment uses one service optical signal as an example for example. Sexual description.

For example, in the implementation of the embodiment shown in FIG. 7 , the target dimension of the local ROADM transmits 80-wavelength calibration optical signals, and the wavelengths of the 80-wavelength calibration optical signals may be λ1, λ2 to λ80, respectively, wherein the 80-channel calibration The wavelength of one target calibration optical signal in the optical signal is equal to the wavelength of the service optical signal shown in this embodiment and both are λ1. It can be seen that the transmission path of the service optical signal with λ1 in the local ROADM is the same as the transmission path of the target calibration optical signal with λ1 in the local ROADM. This 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 λ1 is transmitted along the target dimension in the local ROADM. If both the service optical signal with λ1 and the target calibration optical signal shown above are transmitted to the output port along the target dimension, it will cause a λ1 The conflict between the service optical signal and the target calibration optical signal on the output port, in order to avoid the conflict, the local ROADM shown in this embodiment needs to block the transmission of the target calibration optical signal, so that the service optical signal with λ1 and the target calibration optical signal Between the signals, only the service optical signal is transmitted to the output port, which effectively avoids the conflict on the output port.

The following describes the process of blocking the target calibration optical signal implemented by the local ROADM. It should be clarified that the description of the process of blocking the target calibration optical signal in this embodiment is an optional example and is not limited.

In this embodiment, the local ROADM can adjust the attenuation value of the VOA used to adjust the attenuation value of the target calibration optical signal to the maximum value. When the attenuation value of the VOA is the largest, the target calibration optical signal is blocked and cannot be It is transmitted to the output port, so that only the service optical signal with λ1 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 the service optical signal with λ1 is transmitted, the target attenuation value of the target calibration optical signal with λ1 is determined, and the local ROADM can adjust the VOA used to adjust 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, the output power value obtained by the local ROADM on the output port is the target power value. For the description of the target power value, please refer to the embodiment shown in Figure 7. I will not go into details.

Using the method shown in this embodiment, when the local ROADM receives the service optical signal from the upstream ROADM, the calibration optical signal used to calibrate the transmission path of the service optical signal in the local ROADM can be blocked, so that the The local ROADM can only obtain the output power value of the service optical signal at the output port, which avoids the conflict between the service optical signal and the calibration optical signal on the output port, and the local ROADM can convert the service optical signal based on the insertion loss of the calibration optical signal. The output power value is adjusted to the target power value, thereby realizing 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 realizes the transmission of service optical signals. The following describes how to reduce the transmission of service optical signals and calibration optical signals when the local ROADM transmits service optical signals and calibration optical signals at the same time in conjunction with the embodiment shown in FIG. 9 . The process of calibrating the interference of the optical signal transmission to the service optical signal is explained:

For the specific execution process of step 901 to step 905, please refer to step 701 to step 705 shown in FIG. 7 for details, and the specific execution process will not be repeated in this embodiment.

Step 906, the local ROADM determines multiple groups.

Specifically, when the local ROADM shown in this embodiment acquires multiple calibrated optical signals from the upstream ROADM, if all the calibrated optical signals are directly transmitted through the local ROADM at the same time, the transmitted service optical signals will The signal causes interference. For example, if among the 80 channels in the target dimension of the local ROADM, the channels with λ1 to λ10 are used to transmit service optical signals, and the channels with λ11 to λ80 are used to transmit calibration optical signals. The ROADM directly transmits the calibrated optical signal through the channels having λ11 to λ80, which will cause interference to the service optical signals transmitted by the channels having λ1 to λ10.

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

Specifically, the local ROADM firstly groups multiple calibration optical signals, wherein each group includes one or more calibration optical signals. Continuing to take the above example as an example, when the calibration optical signal is 70 channels and the wavelength is λ11 to λ80, the local ROADM can divide the calibration optical signal into 7 groups, each group has 70 calibration optical signals, such as the first group Including calibration optical signals having wavelengths λ11 to λ20, and so on, the eighth group includes calibration optical signals having wavelengths λ71 to λ80.

The local ROADM first blocks the channel corresponding to the first group for transmitting local optical signals in the target dimension, that is, the local optical signals with wavelengths λ11 to λ20 are blocked, and the local ROADM can pass through the target dimension. The channels with wavelengths λ11 to λ20 transmit the first group of calibrated optical signals. After the local ROADM obtains the output power value of each calibrated optical signal in the first group, the second group is transmitted through the target dimension, and so on. The local ROADM passes through the target. Channels with wavelengths λ71 to λ80 in dimension transmit an eighth group.

The above examples are illustrated by taking the local ROADM to block all local optical signals transmitted in the target dimension, so that each group of calibrated optical signals can be grouped and transmitted through the target dimension as an example for illustration. In other examples, the local ROADM All local optical signals transmitted in the target dimension can also be blocked simultaneously. This embodiment does not limit the rules for grouping multiple calibration optical signals. For example, the local ROADM may randomly group multiple calibration optical signals.

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

For the specific execution process of step 907 shown in this embodiment, please refer to step 706 shown in FIG. 7 for details, and details are not repeated.

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

The target VOA shown in this embodiment is a VOA used to adjust the attenuation value of any one of the above-mentioned multiple calibration optical signals.

In this embodiment, in order to minimize the influence of the calibration optical signal on the transmission of the service optical signal transmitted by the local ROADM, the local ROADM adjusts the attenuation value of the target VOA to the maximum, so that the calibration optical signal passes through the target VOA. The output power is the smallest. It can be seen that when the attenuation value of the target VOA is the largest, the influence of the calibration optical signal on the service optical signal transmitted by the local ROADM is the smallest.

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

In this embodiment, the local ROADM obtains the output power value on the output port to obtain the target attenuation value, and the local ROADM can gradually reduce the attenuation value of the target VOA. Specifically, the local ROADM can set a preset value in advance. The specific value of the preset value is not limited in the embodiment. The local ROADM can detect the output port after the attenuation value of the target VOA is reduced by the preset value every time. If the calibrated optical signal is detected on the output port If the output power value of the calibrated optical signal is not detected on the output port, the attenuation value of the target VOA will continue to be subtracted once by the preset value. .

For example, the preset value may be 0.5dB, and the maximum value of the attenuation value of the target VOA is 5dB. Then, when the local ROADM determines that the attenuation value of the target VOA is 5-0.5=4.5, whether it is detected on the output port The output power value of the calibrated optical signal, if yes, do not reduce the attenuation value of the target VOA, if not, continue to subtract the preset value from the attenuation value of the target VOA, that is, 4.5-0.5=4 , the subsequent process will not be repeated until the local ROADM detects the output power value of the calibrated optical signal on the output port.

For the execution process of step 910 to step 912 shown in this embodiment, please refer to step 707 to step 709 shown in FIG. 7 for details, and the specific execution process will not be repeated. It should be clear that, because the local ROADM shown in this embodiment groups multiple calibrated optical signals from the upstream ROADM, the local ROADM can perform the insertion loss calculation process for each group, or can obtain all the groups. In the case of , the calculation process of insertion loss is performed uniformly for all the calibrated optical signals transmitted through the target dimension.

Using the method shown in this embodiment, when the local ROADM needs to transmit multiple calibration optical signals, the multiple calibration optical signals can be transmitted by grouping and the attenuation value of each calibration optical signal can be adjusted to the maximum, and then gradually reduced until The method of detecting the output power value on the output port effectively reduces the influence of the calibration optical signal transmitted by the local ROADM on the transmission of the service optical signal.

In the embodiment shown in FIG. 8 , the local ROADM is responsible for blocking the calibration optical signal. The following describes the process of how the local ROADM is responsible for blocking the downstream calibration optical signal sent to the downstream ROADM with reference to FIG. 10 . This embodiment The local ROADM shown 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 ROADM 301 or any local ROADM.

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

For the specific execution process of step 1001 shown in this embodiment, please refer to step 810 shown in FIG. 8 , and details are not repeated. Among them, the service optical signal shown in this embodiment comes from the service single board of the first ROADM301. For details, please refer to FIG. 4, and details will not be repeated.

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

In this embodiment, for the description of how the local ROADM sends the downstream calibration optical signal to the downstream ROADM based on the light source, please refer to the description of the local ROADM receiving the calibration optical signal from the upstream ROADM shown in step 704 in FIG.

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

For example, the local ROADM sends 80 channels of downstream calibration optical signals to the downstream ROADM, and the wavelengths of the 80 channels of downstream calibration optical signals are λ1, λ2 to λ80, respectively. The local ROADM is used to determine the target downstream calibration optical signal from the 80 channels of downstream calibration optical signals. , where the target downstream calibration optical signal means that the wavelength of the target downstream calibration optical signal is equal to the wavelength of the service optical signal to be sent by the local ROADM to the downstream ROADM, and the target downstream calibration optical signal and the service optical signal to be sent are in the downstream ROADM The dimensions transmitted in are the same.

For example, the target downstream calibration optical signal is 80 downstream calibration optical signals, and the downstream calibration optical signal with λ2. 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 λ2, and the target downstream calibration has λ2. Optical signals and service optical signals are transmitted in the same dimension in the downstream ROADM.

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

If both the service optical signal with the same wavelength and the target downstream calibration optical signal are transmitted to the downstream ROADM, a conflict between the service optical signal transmission and the target downstream calibration optical signal transmission will be caused in the downstream ROADM. It can be seen that in order to avoid conflicts , the local ROADM shown in this embodiment blocks the transmission of the target downstream calibration optical signal, so that the target downstream calibration optical signal will not be transmitted to the downstream ROADM, causing the downstream ROADM to calibrate the service optical signal with the same wavelength as the target downstream optical signal. Between optical signals, only service optical signals can be received. For the description of the blocking process of the target downstream calibration optical signal, please refer to the process of the local ROADM blocking the target calibration optical signal shown in step 812 in FIG.

Continue to refer to the example shown in step 1002, the transmission path of the service optical signal with λ2 and the target downstream calibration optical signal in the downstream ROADM is the same, in order to avoid the transmission process of the service optical signal with λ2 and the target downstream calibration optical signal in the downstream ROADM The local ROADM shown in this embodiment can block the transmission of the target downstream calibration optical signal, so that the downstream ROADM will receive 80 wavelengths of optical signals, among which, the optical signals with λ1, λ3 to λ80 are calibrated Optical signal, and the optical signal with λ2 is the service optical signal. It can be seen that the downstream ROADM will not receive the service optical signal with wavelength λ2 and the target downstream calibration optical signal at the same time, thus avoiding the target downstream calibration optical signal and the service optical signal. conflict between.

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

Step 1005: The downstream ROADM receives the service optical signal and the downstream calibration optical signal from the local ROADM.

After the downstream ROADM obtains the downstream calibration optical signal, the insertion loss of the downstream ROADM can be calibrated. The specific process is shown in FIG. 7 , and details are not repeated. The processing process of the service optical signal by the downstream ROADM is shown in FIG. 8, and details are not repeated.

It can be seen that using the method shown in this embodiment, the local ROADM blocks the target downstream calibration optical signal having the same wavelength as the service optical signal, so that the target downstream calibration optical signal will not be transmitted to the downstream ROADM, and the downstream ROADM will not simultaneously The service optical signal and the target downstream calibration optical signal with the same wavelength are received, which effectively avoids the conflict between the target downstream calibration optical signal and the service optical signal with the same wavelength in the downstream ROADM.

Based on the methods shown in the foregoing embodiments, possible application scenarios of the method for calibrating insertion loss shown in this application are described below:

scene 1

This application scenario is a deployment scenario, that is, when the transmission path shown in Figure 3 is configured in the optical communication network, each ROADM on the transmission path can be powered on, and then the insertion of each ROADM can be performed by calibrating the optical signal. The loss is calibrated. For the specific calibration process, please refer to the above method embodiment. It will not be repeated. It can be seen that through this application scenario, the insertion loss of all channels in each ROADM in each dimension can be obtained in the deployment stage, which is effective. Therefore, the amount of manual operations is greatly reduced, the efficiency of deployment is improved, and the accuracy of the obtained insertion loss is effectively improved.

scene 2

In this application scenario, when each ROADM obtains the insertion loss of any channel of any dimension within the alarm range, the control plane or network management device of the ROADM can generate alarm information, and the ROADM can be determined through the alarm information. Abnormal channels appear in the channel, which improves the efficiency of fault location and the accuracy of troubleshooting.

This application scenario does not limit the alarm range. As long as the insertion loss is within the alarm range, it means that the channel has fiber breakage, device damage, or dirty fiber or device. For example, the alarm range is greater than or equal to 0dB and less than or equal to 10dB, in another example, the alarm range is greater than or equal to 20dB.

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

Optionally, in the process of calibrating the loss and loss of each ROADM, each ROADM can delete the scheduling of the calibration optical signal, so that the calibration optical signal will not be transmitted to the target dimension of the local ROADM, and each ROADM recovers. For the transmission of the local optical signal, please refer to the above method embodiment for the description of the local optical signal, and details are not repeated.

scene 3

This scenario is shown in conjunction with FIG. 11 , and this scenario is illustrated by taking the method shown in this embodiment applied to an automatically switched optical network (automatically switched optical network, ASON) network as an example:

As shown in FIG. 11 , the ASON network includes a plurality of ROADMs, a first ROADM 1101 for generating a service optical signal, and a non-ROADM 1102 for receiving the service optical signal and processing the service optical signal.

Specifically, the service optical signal from the first ROADM 1101 is transmitted along the transmission path 1103. For the specific description of the transmission path 1103, please refer to FIG. 3, and details are not repeated. If the service optical signal transmitted along the transmission path 1103 cannot be successfully transmitted, for example, the service optical signal cannot be received at the ROADM 1102, the transmission path of the service optical signal needs to be rerouted. After rerouting, if the service optical signal cannot be successfully transmitted to the ROADM1102, the service optical signal can be transmitted from the first ROADM1101 to the other two transmission paths without the ROADM1102 in the ASON network, as shown in Figure 11. The transmission path 1104 and the transmission path 1105 are calibrated for insertion loss. For the description of the transmission path 1104 and the transmission path 1105, please refer to the description of the transmission path 1103 for details, and details are not repeated.

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, the network management device can determine the transmission path that can successfully transmit the service optical signal to the non-ROADM 1102. For example, taking the transmission path 1104 as an example, if the output power value of the calibrated optical signal can be detected in each ROADM included in the transmission path 1104, it means that the transmission path 1104 can successfully transmit the service optical signal to the non-ROADM 1102.

Optionally, if there are multiple transmission paths that can successfully transmit the service optical signal to the ROADM1102, the network management device can select the subsequent transmission for the service optical signal transmission among the multiple transmission paths according to the parameters of each transmission path. Path, this parameter can be OSNR, delay, packet loss rate, etc. It can be seen that when the service optical signal is rerouted in this application scenario, the transmission path can be selected according to various parameters, which effectively improves the transmission performance of the subsequent service optical signal.

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

The obtaining unit 1201 is configured to obtain an input power value and an output power value of a calibrated optical signal, where the input power value is the power value of the calibrated optical signal obtained on the input port of the network device, and the output power value is between the power value of the calibrated optical signal obtained on the output port of the network device, where the calibrated optical signal is an optical signal that does not carry services;

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

Optionally, the processing unit 1202 is further configured to: obtain a target attenuation value according to the insertion loss, where the target attenuation value is used to adjust the target power value of the optical signal output from the output port, and the target attenuation value is The calibration optical signal is transmitted from the input port to the attenuation value between the output port.

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

Optionally, the processing unit 1202 is specifically configured to: obtain an initial attenuation value, where the initial attenuation value is an attenuation value in a state where the output power value is obtained on the output port; determine that the insertion loss is equal to the first A difference between a power difference value and the initial attenuation value, and the first power difference value is a difference between the input power value and the output power value.

Optionally, the processing unit 1202 is specifically configured to: acquire the target attenuation value, where the target attenuation value is a 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.

Optionally, the network device further includes a first blocking unit 1203, configured to block the transmission of a local optical signal, the wavelength of the local optical signal is equal to the wavelength of the calibration optical signal, and the local optical signal is the network An optical signal generated by a device that does not carry services.

Optionally, the network device further includes a second blocking unit 1204, configured to block 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 service optical signal is in the The power on the output port is the target power value.

Optionally, the network device further includes a transceiver unit 1205, which is specifically configured to: send 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 ability to send the calibrated optical signal; An indication message is received from the upstream network device, where the indication message is used to indicate that the upstream network device has the ability to send the calibrated optical signal.

Optionally, the processing unit 1202 is further configured to: if the modulation mode of the optical signal from the upstream network device is the target modulation mode, determine that the optical signal is the calibrated optical signal, and the target modulation mode is the The modulation mode corresponding to the calibration optical signal.

Optionally, the processing unit 1202 is further configured to: adjust the attenuation value corresponding to the calibration optical signal to the maximum value; and gradually decrease the attenuation value corresponding to the calibration optical signal until the output port obtains the output power value.

Optionally, the input port is any one of multiple input ports possessed by the network device, and the output port is any one of multiple output ports possessed by the network device.

FIG. 13 is a schematic structural diagram of a network device provided by this 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. Among them, the memory 1302 stores program instructions and data.

The memory 1302 stores program instructions and data corresponding to the steps performed by the network device in the foregoing embodiments corresponding to FIG. 7 , FIG. 8 , FIG. 9 , and FIG. 10 . The processor 1301 is configured to execute the processing-related steps performed by the network device as shown in any of the foregoing embodiments in FIG. 7 , FIG. 8 , FIG. 9 and FIG. 10 . In the embodiment shown in FIG. 7 , the transceiver 1303 is used for performing step 801 , for receiving an indication message and for performing step 704 . The processor 1301 is configured to execute steps 703 , 705 to 709 . In the embodiment shown in FIG. 8 , the transceiver 1303 is used for performing step 901 , for receiving an indication message and for performing step 904 . The processor 1301 is configured to execute 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 . The processor 1301 is configured to execute step 1003 .

The embodiments of the present application also provide a digital processing chip. The digital processing chip integrates circuits and one or more interfaces for implementing the functions of the processor 1301 described above. When a memory is integrated in the digital processing chip, the digital processing chip can perform the method steps of any one or more of the foregoing embodiments. When no memory is integrated in the digital processing chip, it can be connected with an external memory through an interface. The digital processing chip implements the actions performed by the sending device or the receiving device in the above embodiment according to the program codes stored in the external memory.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, and should cover within the scope of protection of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (24)

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:

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.

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:

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.

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:

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.

20. The network device of claim 14, wherein 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, wherein the target modulation mode is a modulation mode corresponding to the calibration optical signal.

21. The network device of claim 12 or 13, wherein 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 on the output port.

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.

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