Insertion loss measuring apparatus and method

Abstract

The embodiment of the present application relates to the technical field of communication, and discloses an insertion loss measuring device, comprising a controller, a transmitting module, a receiving module and a loopback module, the transmitting module, the receiving module and the loopback module are integrated on an optical cross-connect device; the controller is used for controlling the transmitting module to send first detection light with a first power to the optical cross-connect device; the loopback module is used for returning the first detection light transmitted through the optical cross-connect device to the receiving module; the receiving module is used for detecting the power of the returned first detection light, and taking the detected power as a second power; the controller is further used for determining an insertion loss measuring result of the optical cross-connect device according to the first power and the second power. The embodiment of the present application also discloses an insertion loss measuring method. The insertion loss measuring device and method provided by the embodiment of the present application can improve the reusability of the insertion loss measurement of the optical cross-matrix device, and the insertion loss of the optical cross-matrix device can be measured in real time in normal service.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of communication technology, and in particular to an insertion loss measurement device and method. Background Technology

[0002] Optical cross-connect (OXC) devices are used in fiber optic network nodes. By cross-connecting optical signals, they enable flexible and efficient management of optical transmission networks and are an important means of achieving reliable network protection, recovery, automatic wiring, and monitoring.

[0003] At present, most optical cross-connect devices use optical cross-connect matrices for connection. Since the optical fibers on the optical cross-connect matrix side are easily dirty or have poor contact, and it is difficult to detect problems on the optical cross-connect matrix side, the current method is to use external testing equipment to detect the insertion loss of each optical fiber segment to determine the optical fiber problems in the optical cross-connect matrix device. Insertion loss refers to the signal power loss caused by the insertion of the device into the transmission line or optical fiber.

[0004] Because the insertion loss of optical cross-connect matrix (OCM) devices changes with use and transportation, it is necessary to measure the insertion loss frequently. However, OCM devices have many ports that need to be measured. If external testing equipment is used to measure the insertion loss, the connection to the optical fiber in the OCM device needs to be re-established each time, resulting in poor reusability. Furthermore, once the OCM device is put into use, it is not possible to use external testing equipment to measure the insertion loss in real time. Summary of the Invention

[0005] The purpose of this invention is to provide an insertion loss measurement device and method, which can improve the reusability of insertion loss measurement of optical cross-connect matrix devices and realize real-time measurement of insertion loss of optical cross-connect matrix devices.

[0006] To address the aforementioned technical problems, embodiments of the present invention provide an insertion loss measurement device, comprising: a controller, a transmitting module, a receiving module, and a loopback module, wherein the transmitting module, the receiving module, and the loopback module are integrated on an optical cross-connect device; the controller is used to control the transmitting module to send a first detection light with a first power to the optical cross-connect device; the loopback module is used to return the first detection light transmitted through the optical cross-connect device to the receiving module; the receiving module is used to detect the power of the returned first detection light and use the detected power as a second power; the controller is also used to determine the insertion loss measurement result of the optical cross-connect device based on the first power and the second power.

[0007] Embodiments of the present invention also provide an insertion loss measurement method applied to an insertion loss measurement device. The insertion loss measurement device includes a controller, a transmitting module, a receiving module, and a loopback module, which are integrated on an optical cross-connect device. The method includes: using the controller to control the transmitting module to send a first detection light with a first power to the optical cross-connect device; using the loopback module to return the first detection light transmitted through the optical cross-connect device to the receiving module; using the receiving module to detect the power of the returned first detection light and using the detected power as a second power; and determining the insertion loss measurement result of the optical cross-connect device based on the first power and the second power.

[0008] Compared to existing technologies, this invention integrates the transmitting module, receiving module, and loopback module into an optical cross-connect device, determining the insertion loss measurement results based on the transmitted and received power of the detected light. Because the insertion loss measurement device is integrated into the optical cross-connect device, it eliminates the need to reconnect the fiber optic cable to the device for each measurement, improving the reusability of insertion loss measurements. Furthermore, since the measurement device is integrated, measurements can be performed on the optical cross-connect device at any time without affecting normal services; even after the optical cross-connect device is put into use, real-time measurement of insertion loss can still be achieved. Attached Figure Description

[0009] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, and these illustrative descriptions do not constitute a limitation on the embodiments.

[0010] Figure 1 This is a schematic diagram of the insertion loss measuring device provided in the first embodiment of the present invention;

[0011] Figure 2 An example diagram illustrating self-loop insertion loss measurement using the insertion loss measurement device provided in the second embodiment of the present invention;

[0012] Figure 3 An example diagram illustrating inter-board insertion loss measurement using the insertion loss measurement device provided in the second embodiment of the present invention;

[0013] Figure 4 Another example diagram showing inter-board insertion loss measurement using the insertion loss measurement device provided in the second embodiment of the present invention;

[0014] Figure 5 A flowchart illustrating the insertion loss measurement method provided in the third embodiment of the present invention;

[0015] Figure 6 A flowchart illustrating the insertion loss measurement method provided in the third embodiment of the present invention for measuring self-loop insertion loss;

[0016] Figure 7 This is a flowchart illustrating the insertion loss measurement method provided in the third embodiment of the present invention for measuring inter-board insertion loss. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details are presented in the various embodiments of the present invention to facilitate a better understanding of this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments. The division of the various embodiments below is for ease of description and should not constitute any limitation on the specific implementation of the present invention. The various embodiments can be combined with and referenced by each other without contradiction.

[0018] The first embodiment of the present invention relates to an insertion loss measuring device, such as... Figure 1 As shown, it includes a controller 101, a transmitter module 102, a receiver module 103, and a loopback module 104. The transmitter module 102, receiver module 103, and loopback module 104 are integrated on the optical cross-connect device 20.

[0019] Specifically, the controller 101 is used to control the transmitting module 102 to send a first detection light with a first power to the optical cross-connect device 20; the loopback module 104 is used to return the first detection light transmitted through the optical cross-connect device 20 to the receiving module 103; the receiving module 103 is used to detect the power of the returned first detection light and use the detected power as the second power; the controller 101 is used to determine the insertion loss measurement result of the optical cross-connect device 20 based on the first power and the second power.

[0020] Optionally, when the controller 101 determines the insertion loss measurement result of the optical cross-connect device 20 based on the first power and the second power, it can use the difference between the first power and the second power as the insertion loss measurement result of the optical cross-connect device 20, or it can correct the difference by multiplying it by a correction factor and then using the corrected result as the insertion loss measurement result.

[0021] Optionally, the transmitting module 102 supports the emission of detection light of multiple wavelengths, and the output power of the detection light is adjustable.

[0022] Optionally, the receiving module 103 supports the detection of power at multiple wavelengths.

[0023] In a specific example, the loopback module 104 is also used to determine whether the wavelength of the first detection light is available, and return the information on whether the wavelength of the first detection light is available to the controller 101; the controller 101 is also used to control the transmission module 102 to adjust the wavelength and send a second detection light with the power of the first power to the optical cross-connect device 20 when the wavelength of the first detection light is unavailable.

[0024] Optionally, if the loopback module 104 determines that the wavelength of the first detection light is available, it returns a correct code to the controller 101; if the loopback module 104 determines that the wavelength of the first detection light is unavailable, it returns an error code to the controller 102.

[0025] Because light of the same wavelength will interfere with each other in the optical cross-connect device 20, when using the detection light for insertion loss measurement, light with a wavelength different from the light currently used by the optical cross-connect device 20 should be used for detection. Optionally, when determining whether the first detection light is usable, the loopback module 104 can determine whether the wavelength of the first detection light is the same as the wavelength of the light currently used by the optical cross-connect device 20. If the wavelength of the first detection light is the same as one of the wavelengths of the light currently used by the optical cross-connect device 20, the first detection light is determined to be unusable; otherwise, the first detection light is determined to be usable. For example, the loopback module 104 matches the wavelength of the first detection light with the wavelength of the light currently used by the optical cross-connect device 20 one by one. If the match is successful, it means that the wavelength of the detection light is one of the wavelengths currently used by the optical cross-connect device 20, and the first detection light is determined to be unusable, and the wavelength of the detection light needs to be changed.

[0026] It should be understood that the insertion loss measurement device provided in the embodiments of the present invention can also manually select the wavelength of the detection light. The user selects a light with a wavelength different from the light used in the current service of the optical cross-connect device, and then the controller 101 controls the emission module 102 to emit the light selected by the user as the detection light.

[0027] In a specific example, the controller 101 is also used to determine whether the second power is within a preset range. If the second power is not within the preset range, the controller controls the transmitting module 102 to send a third detection light with a third power to the optical cross-connect device 20. The preset range is determined by the detection accuracy of the receiving module 103, and the third power is obtained by adjusting the first power according to a preset step size.

[0028] It should be noted that, since the power of the received detection light needs to be within a certain range to achieve a certain detection accuracy, a preset range needs to be defined for the power of the returned detection light to ensure that the receiving module 103 can effectively detect the power of the detection light and thus determine the insertion loss measurement result. The preset range can be set based on the receiving module 103 effectively detecting the power of the detection light; the specific value is not limited here.

[0029] Specifically, if the controller 101 determines that the second power is within a preset range, then the controller 101 determines the insertion loss measurement result of the optical cross-connect device based on the first power and the second power. If the controller 101 determines that the second power is not within the preset range, then the controller 101 controls the transmitting module 102 to send a third detection light with a third power to the optical cross-connect device 20. Then, the receiving module 103 detects the power of the third detection light and uses the detected power as the fourth power. The controller 101 then determines whether the fourth power is within the preset range. If it is not within the preset range, the power of the detection light is adjusted again according to the preset step size until the controller 101 determines that the detection light is within the preset range, and the insertion loss measurement result of the optical cross-connect device 20 can be determined. The preset step size can be set according to actual needs. Generally speaking, when the preset step size is set smaller, more adjustments are made; when the preset step size is set larger, fewer adjustments are made.

[0030] The insertion loss measurement device provided by this invention integrates a transmitting module, a receiving module, and a loopback module into an optical cross-connect device. It determines the insertion loss measurement result of the optical cross-connect device based on the transmitted and received power of the detected light. Because the insertion loss measurement device is integrated into the optical cross-connect device, it eliminates the need to reconnect the fiber optic cable to the device for each measurement, improving the reusability of the insertion loss measurement. Furthermore, since the measurement device is integrated into the optical cross-connect device, measurements can be performed at any time without affecting normal services. Even after the optical cross-connect device is put into use, real-time measurement of the insertion loss can still be achieved.

[0031] The second embodiment of the present invention relates to an insertion loss measurement device. The second embodiment is largely the same as the first embodiment, except that in the embodiment of the present invention, the optical cross-connect device 20 is an optical cross-connect matrix device 20', which includes N slots. The transmitting module 102, the receiving module 103, and the loopback module 104 are connected to the optical cross-connect matrix device 20' through at least one slot, where N is a positive integer greater than 1.

[0032] Optionally, the transmitting module 102, the receiving module 103, and each slot of the optical cross-connect matrix device 20' are connected, and N loopback modules 104 are connected to each slot respectively. Preferably, in practical applications, the loopback module 104 can simultaneously accommodate normal service and insertion loss measurements. That is, during normal use, light from normal services can pass through the loopback module 104; when measuring insertion loss, light from normal services can also pass through the loopback module 104 normally. At the same time, the loopback module 104 can perform insertion loss measurements of the optical cross-connect matrix device 20' by creating an insertion loss measurement channel.

[0033] For a specific example, please refer to Figure 2 This is an example diagram of the insertion loss measurement device provided in the embodiments of the present invention performing self-loop insertion loss measurement. Figure 2 The dashed lines in the diagram represent connections, and the solid lines represent the light paths. Specifically, controller 101 controls transmitter module 102 to send a first detection light with a first power to the Kth slot of optical cross-matrix device 20', where K is a positive integer and K is less than or equal to N; loopback module 104 is used to return the first detection light to receiver module 103 at the Kth slot; receiver module 103 is used to detect the power of the returned first detection light and use the detected power as the second power; controller 101 determines the self-loop insertion loss measurement result of optical cross-matrix device 20' based on the first power and the second power.

[0034] For a specific example, please refer to Figure 3 This is an example diagram illustrating the inter-board insertion loss measurement using the insertion loss measurement device provided in this embodiment of the invention. Similarly, Figure 3 The dashed lines in the diagram represent connections, and the solid lines represent light paths. The loopback module 104 includes at least a first loopback unit 1041 and a second loopback unit 1042. The first loopback unit 1041 is connected to the Kth slot, and the second loopback unit 1042 is connected to the Jth slot, where K and J are positive integers less than or equal to N. The controller 101 controls the transmitting module 102 to send a first detection light with a first power to the Kth slot. The first loopback unit 1041 sends the first detection light from the Kth slot to the Jth slot. The second loopback unit 1042 returns the first detection light from the Jth slot to the receiving module 103. The receiving module 103 detects the power of the returned first detection light as a second power. The controller 101 also determines the inter-board insertion loss measurement result between the Kth slot and the Jth slot based on the first power and the second power.

[0035] It is understandable that the first loopback unit 1041 and the second loopback unit 1042 can be implemented by two loopback modules 104, for example, Figure 4 The diagram shown is another example of inter-board insertion loss measurement performed by the insertion loss measurement device provided in an embodiment of the present invention. Figure 4 In the diagram, dashed lines represent connections, and solid lines represent light paths. There are N loopback modules 104, each corresponding one-to-one with one of the N slots in the optical cross-connect matrix device 20'. When it is necessary to measure the inter-board insertion loss between the Kth slot and the Jth slot, both the loopback module 104 in the Kth slot and the loopback module 104 in the Jth slot can be used simultaneously. Furthermore, Figure 4 Self-loop insertion loss measurement can also be performed. Since there are N loopback modules 104, self-loop insertion loss measurement can be performed on N slots. That is, self-loop insertion loss measurement can be performed on each slot separately, thus completing the self-loop insertion loss measurement of 20'N slots of the optical cross-connect matrix equipment.

[0036] Optionally, the loopback module 104 may include a self-loop measurement mode and an inter-board measurement mode, which can be configured manually or by the controller 101.

[0037] Optionally, when the controller 101 determines the inter-board insertion loss measurement result between the Kth slot and the Jth slot based on the first power and the second power, it can use the difference between the first power and the second power as the inter-board insertion loss measurement result between the Kth slot and the Jth slot. However, since there is insertion loss from the detection light from the transmitting module 102 to the Kth slot and from the Jth slot to the receiving module 103, using the difference between the first power and the second power as the inter-board insertion loss measurement result for the Kth and Jth slots is not accurate enough. Optionally, the difference can be subtracted... Figure 3 The insertion loss of optical paths ① and ② is used to obtain the insertion loss of optical path ③ as the inter-board insertion loss measurement result between the Kth slot and the Jth slot. The insertion loss of optical path ① can be obtained by measuring the self-loop insertion loss of the Kth slot, and the insertion loss of optical path ② can be obtained by measuring the self-loop insertion loss of the Jth slot.

[0038] The insertion loss measurement device provided in this invention integrates a transmitting module, a receiving module, and a loopback module into an optical cross-connect matrix device. The transmitting module, receiving module, and loopback module are connected to the optical cross-connect matrix device through at least one slot. By controlling the direction of the detection light, self-loop insertion loss measurement and inter-board insertion loss measurement of the optical cross-connect matrix device can be achieved. At the same time, when calculating the inter-board insertion loss measurement results, combining the self-loop insertion loss measurement can obtain more accurate results for the inter-board insertion loss measurement, thereby improving the accuracy of the inter-board insertion loss measurement.

[0039] It is worth mentioning that all modules involved in the above embodiments are logical modules. In practical applications, a logical unit can be a physical unit, a part of a physical unit, or a combination of multiple physical units. Furthermore, to highlight the innovative aspects of this invention, the above embodiments do not include units that are not closely related to solving the technical problem proposed by this invention; however, this does not mean that other units are absent from the above embodiments.

[0040] The third embodiment of this invention relates to an insertion loss measurement method, applied to an insertion loss measurement device. The insertion loss measurement device includes a controller, a transmitting module, a receiving module, and a loopback module. The transmitting module, receiving module, and loopback module are integrated on an optical cross-connect device, such as... Figure 5 As shown, the specific steps include:

[0041] S201: The controller controls the transmitting module to send a first detection light with a first power to the optical cross-connect device.

[0042] S202: The loopback module is used to return the first detection light, which has been transmitted through the optical cross-connect device, to the receiving module.

[0043] S203: Detect the power of the returned first detection light using the receiving module, and use the detected power as the second power.

[0044] S204: Determine the insertion loss measurement results of the optical cross-connect device based on the first power and the second power.

[0045] Optionally, S204 specifically involves: using the controller to determine the insertion loss measurement results of the optical cross-connect device based on the first power and the second power.

[0046] Optionally, after S201, that is, after the controller controls the transmitting module to send a first detection light with a first power to the optical cross-connect device, the method further includes: using a loopback module to determine whether the wavelength of the first detection light is available; if the wavelength of the first detection light is not available, then using the controller to control the transmitting module to adjust the wavelength and send a second detection light with a first power to the optical cross-connect device.

[0047] Optionally, after S203, that is, after using the receiving module to detect the power of the returned first detection light and using the detected power as the second power, the method further includes: using the controller to determine whether the second power is within a preset range; if the second power is not within the preset range, using the controller to control the transmitting module to send a third detection light with a third power to the optical cross-connect device, wherein the preset range is determined by the detection accuracy of the receiving module, and the third power is obtained by adjusting the first power according to a preset step size.

[0048] Optionally, the optical cross-connect device is an optical cross-connect matrix device, which includes N slots. The transmitting module, receiving module and loopback module are connected to the optical cross-connect matrix device through at least one slot, where N is a positive integer greater than 1.

[0049] For a specific example, please refer to Figure 6 This is a flowchart illustrating the insertion loss measurement method provided by the present invention for measuring self-loop insertion loss, specifically including the following steps:

[0050] S201': The controller controls the transmitting module to send the first detection light to the Kth slot of the optical cross-matrix device, where K is a positive integer.

[0051] S202: The loopback module is used to return the first detection light to the receiving module in the Kth slot.

[0052] S203: Detect the power of the returned first detection light using the receiving module, and use the detected power as the second power.

[0053] S204: The controller determines the self-loop insertion loss measurement result of the Kth slot based on the first power and the second power.

[0054] In a specific example, the loopback module includes at least a first loopback unit and a second loopback unit. The first loopback unit is connected to the Kth slot, and the second loopback unit is connected to the Jth slot, where K and J are positive integers less than or equal to N; please refer to [reference needed]. Figure 7 This is a flowchart illustrating the insertion loss measurement method provided by the embodiments of the present invention for measuring inter-board insertion loss, specifically including the following steps:

[0055] S201”: The controller controls the transmitting module to send the first detection light to the Kth slot.

[0056] S202”: The first detection light is sent from the Kth slot to the Jth slot using the first loopback unit.

[0057] S203”: The first detection light is returned to the receiving module using the second loopback unit.

[0058] S204”: The receiving module detects the power of the returned first detection light and uses the detected power as the second power.

[0059] S205”: The controller determines the inter-board insertion loss measurement results between the Kth slot and the Jth slot based on the first power and the second power.

[0060] The insertion loss measurement method provided by this invention integrates a transmitting module, a receiving module, and a loopback module into an optical cross-connect device, and determines the insertion loss measurement result of the optical cross-connect device based on the transmitted and received power of the detected light. Since the insertion loss measurement device is integrated into the optical cross-connect device, it is not necessary to reconnect the optical fiber to the optical cross-connect device for each measurement, thus improving the reusability of the insertion loss measurement. Furthermore, because the measurement device is integrated into the optical cross-connect device, measurements can be performed on the optical cross-connect device at any time without affecting normal services. Even after the optical cross-connect device is put into use, real-time measurement of the insertion loss of the optical cross-connect device can still be achieved.

[0061] It is not difficult to see that this embodiment is a method embodiment corresponding to the first and second embodiments, and this embodiment can be implemented in conjunction with the first and second embodiments. The relevant technical details mentioned in the first and second embodiments are still valid in this embodiment, and will not be repeated here to reduce repetition. Accordingly, the relevant technical details mentioned in this embodiment can also be applied to the first and second embodiments.

[0062] Furthermore, those skilled in the art will understand that the step divisions of the various methods described above are merely for clarity of description. In practice, they can be combined into one step or some steps can be split into multiple steps. As long as they include the same logical relationship, they are all within the scope of protection of this patent. Adding insignificant modifications or introducing insignificant designs to the algorithm or process, without changing the core design of the algorithm and process, are also within the scope of protection of this patent.

[0063] Those skilled in the art will understand that the above embodiments are specific embodiments for implementing the present invention, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of the present invention.

Claims

1. An insertion loss measuring device, characterized in that, include: The device includes a controller, a transmitting module, a receiving module, and a loopback module, all integrated on an optical cross-connect device. The controller is used to control the transmitting module to send a first detection light with a first power to the optical cross-connect device; The loopback module is used to return the first detection light, which has been transmitted through the optical cross-connect device, to the receiving module. The receiving module is used to detect the power of the returned first detection light and use the detected power as the second power; The controller is also configured to determine the insertion loss measurement result of the optical cross-connect device based on the first power and the second power; The loopback module is also used to determine whether the wavelength of the first detection light is available, and to return the information on whether the wavelength of the first detection light is available to the controller. If the wavelength of the first detection light is the same as one of the wavelengths of the light used by the current service of the optical cross-connect device, then the first detection light is determined to be unavailable. The controller is also configured to, when the wavelength of the first detection light is unavailable, control the transmitting module to adjust the wavelength and send a second detection light with the power of the first power to the optical cross-connect device; The optical cross-connect device is an optical cross-connect matrix device, which includes N slots. The transmitting module, the receiving module, and the loopback module are connected to the optical cross-connect matrix device through at least one slot, where N is a positive integer greater than 1. The controller is used to control the transmitting module to send the first detection light to the Kth slot of the optical cross-matrix device, where K is a positive integer and less than or equal to N; The loopback module is also used to return the first detection light to the receiving module through the Kth slot.

2. The insertion loss measuring device according to claim 1, characterized in that, The controller is also used to determine whether the second power is within a preset range. If the second power is not within the preset range, the controller controls the transmitting module to send a third detection light with a third power to the optical cross-connect device. The preset range is determined by the detection accuracy of the receiving module, and the third power is obtained by adjusting the first power according to a preset step size.

3. The insertion loss measuring device according to claim 1, characterized in that, The controller is also configured to determine the self-loop insertion loss measurement result of the Kth slot based on the first power and the second power.

4. The insertion loss measuring device according to claim 1, characterized in that, The loopback module includes at least a first loopback unit and a second loopback unit. The first loopback unit is connected to the Kth slot, and the second loopback unit is connected to the Jth slot. K and J are positive integers and are less than or equal to N. The first loopback unit is used to send the first detection light from the Kth slot to the Jth slot; The second loopback unit is used to return the first detection light to the receiving module; The controller is also configured to determine the inter-board insertion loss measurement result between the Kth slot and the Jth slot based on the first power and the second power.

5. A method for measuring insertion loss, characterized in that, An insertion loss measurement device is applied to an optical cross-connect device, the device comprising a controller, a transmitting module, a receiving module, and a loopback module, wherein the transmitting module, the receiving module, and the loopback module are integrated on an optical cross-connect device, and the method includes: The controller controls the transmitting module to send a first detection light with a first power to the optical cross-connect device; The loopback module is used to return the first detection light, which has been transmitted through the optical cross-connect device, to the receiving module; The receiving module is used to detect the power of the returned first detection light, and the detected power is used as the second power; The insertion loss measurement results of the optical cross-connect device are determined based on the first power and the second power. After the controller controls the transmitting module to send a first detection light with a first power to the optical cross-connect device, the method further includes: The loopback module is used to determine whether the wavelength of the first detection light is available. If the wavelength of the first detection light is the same as one of the wavelengths of the light used by the current service of the optical cross-connect device, the first detection light is determined to be unavailable. If the wavelength of the first detection light is unavailable, the controller controls the transmitting module to adjust the wavelength and then sends a second detection light with the power of the first power to the optical cross-connect device. The optical cross-connect device is an optical cross-connect matrix device, which includes N slots. The transmitting module, the receiving module, and the loopback module are connected to the optical cross-connect matrix device through at least one slot, where N is a positive integer greater than 1. Specifically, the step of using the controller to control the transmitting module to send a first detection light with a first power to the optical cross-connect device is as follows: The controller controls the transmission module to send the first detection light to the Kth slot of the optical cross-matrix device, where K is a positive integer and less than or equal to N; The step of using the loopback module to return the first detection light, after being transmitted through the optical cross-connect device, to the receiving module is specifically as follows: The loopback module is used to return the first detection light to the receiving module through the Kth slot.

6. The insertion loss measurement method according to claim 5, characterized in that, After detecting the power of the returned first detection light using the receiving module and using the detected power as the second power, the method further includes: The controller is used to determine whether the second power is within a preset range; If the second power is not within the preset range, the controller controls the transmitting module to send a third detection light with a third power to the optical cross-connect device. The preset range is determined by the detection accuracy of the receiving module, and the third power is obtained by adjusting the first power according to a preset step size.

7. The insertion loss measurement method according to claim 5, characterized in that, The step of determining the insertion loss measurement result of the optical cross-connect device based on the first power and the second power specifically involves: The controller is used to determine the self-loop insertion loss measurement result of the Kth slot based on the first power and the second power.

8. The insertion loss measurement method according to claim 5, characterized in that, The loopback module includes at least a first loopback unit and a second loopback unit. The first loopback unit is connected to the Kth slot, and the second loopback unit is connected to the Jth slot. K and J are positive integers and are less than or equal to N. The step of using the loopback module to return the first detection light, after being transmitted through the optical cross-connect device, to the receiving module includes: The first detection light is sent from the Kth slot to the Jth slot using the first loopback unit; The first detection light is returned to the receiving module using the second loopback unit; The step of determining the insertion loss measurement result of the optical cross-connect device based on the first power and the second power specifically involves: The controller is used to determine the inter-board insertion loss measurement results between the Kth slot and the Jth slot based on the first power and the second power.

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