Method, system and optical module debugging method for evaluating relative transmission loss of optical fiber lines

Abstract

The present application discloses a method for evaluating the relative transmission loss of an optical fiber line, comprising: enabling an optical module to enable each optical chip to radiate laser light; reading a power value group of each transmission channel of the optical fiber line to be evaluated measured by an optical power meter as a first power value group; controlling each coupling lens of the optical module to move along a direction parallel to the arrangement of each optical chip so that each coupling lens and each optical chip are in a second relative position; wherein the second relative position is different from the first relative position; reading a power value group of each transmission channel of the optical fiber line to be evaluated measured by the optical power meter after the movement is completed as a second power value group; taking the difference between the corresponding power values ​​in the value combination set to calculate the relative transmission loss of each transmission channel of the optical fiber line to be evaluated, wherein the value combination set includes the first power value group and the second power value group. The aforementioned difference calculation process can eliminate additional connection loss, so the aforementioned evaluation method can obtain a relatively accurate relative transmission loss.

Description

Technical Field

[0001] The present invention relates to the field of optical communications, in particular to a method and system for evaluating the relative transmission loss of optical fiber lines and a method for debugging and producing optical modules based on the detection method. Background Art

[0002] Optical modules are important optoelectronic devices in modern communications, used for converting photoelectric signals. They consist of an electrical terminal for transmitting electrical signals and an optical transmitter for transmitting optical signals. The optical transmitter contains multiple optical chips that convert electrical signals into optical signals and corresponding coupling lenses for optical signal coupling. During the commissioning and manufacturing of optical modules, ensuring balanced output power across the optical chips on the transmitter is a key consideration. This involves connecting the optical module to a power meter via an optical fiber cable (such as an MPO-FC cable). The power output from the cable is then read by the power meter to adjust the module. During this process, the insertion loss of each channel in the optical fiber cable is a key consideration before adjusting the optical module. When optical fiber cables leave the factory, they are marked with nominal insertion loss values ​​for each channel. Fiber manufacturers typically use the insertion-return loss method to measure these nominal values.

[0003] The so-called insertion loss method is to measure the reference power P by using a high-precision standard light source and a power meter. ref And the power P after transmission through the optical fiber through Calculate the insertion loss IL = -10*log10(P through / P ref However, this method is limited by the near-perfect testing conditions of a clean environment, precise fitting, initial connection, and fixed, standardized ports. The factory-specified value represents the fiber's loss under these ideal conditions. However, in actual use, additional connection loss can occur due to frequent plugging and unplugging, varying device ports, and operational factors. Therefore, directly using the factory-specified insertion loss value during the commissioning and manufacturing of optical modules will result in poor power balance across the module's optical channels. Summary of the Invention

[0004] This application provides a method for evaluating the relative transmission loss of optical fiber lines, aiming to minimize the impact of additional connection loss existing in actual environments due to plugging and unplugging, different ports, and operational factors, so as to obtain a relatively accurate relative transmission loss.

[0005] In one aspect, the present application provides a method for evaluating the relative transmission loss of an optical fiber. The optical fiber to be evaluated includes multiple transmission channels, each optically coupled between a light-emitting end of an optical module and a light-receiving end of a power meter. The light-emitting end includes an optical chip and a coupling lens. The optical chip and the coupling lens are currently in a first relative position, and laser light generated by the optical chip enters the transmission channel after being coupled by the coupling lens. The method comprises the following steps:

[0006] enabling the optical module to cause each optical chip to radiate laser light;

[0007] Reading the power value group of each transmission channel of the optical fiber line to be evaluated measured by the optical power meter as the first power value group;

[0008] Controlling each coupling lens of the optical module to move in a direction parallel to the arrangement direction of each optical chip so that each coupling lens and each optical chip are in a second relative position; wherein the second relative position is different from the first relative position;

[0009] After the movement is completed, the power value group of each transmission channel of the optical fiber line to be evaluated measured by the optical power meter is read as the second power value group;

[0010] The relative transmission loss of each transmission channel of the optical fiber to be evaluated is calculated by taking the difference between the corresponding power values ​​in the value combination set, wherein the value combination set includes the first power value group and the second power value group.

[0011] In one embodiment, the step of calculating the relative transmission loss includes:

[0012] Calculating the difference between the power values ​​of the transmission channels corresponding to the different relative positions of each optical chip and each coupling lens according to the value combination set;

[0013] The relative transmission loss of each transmission channel is determined based on the respective differences.

[0014] In one embodiment, the transmission channel includes a first transmission channel and a second transmission channel, the optical chip includes a first optical chip, and the coupling lens includes a first coupling lens and a second coupling lens;

[0015] In the step of reading the first power value group, at the first relative position, the first optical chip is coupled to the first coupling lens, and the laser light generated by the first optical chip enters the first transmission channel; the first power value group includes power values ​​1A1-a, where 1A1-a represents the power values ​​of the first transmission channel read at the first relative position;

[0016] In the step of reading the second power value group, at the second relative position, the first optical chip is coupled to the second coupling lens, and the laser light generated by the first optical chip enters the second transmission channel; the second power value group includes power values ​​2A1-b, where 2A1-b represents the power values ​​of the second transmission channel read at the second relative position;

[0017] The step of calculating the difference between the power values ​​of the transmission channels corresponding to the optical chips at different relative positions includes: calculating the difference AB1 between the power value 2A1-b and the power value 1A1-a;

[0018] The step of determining the relative transmission loss of each transmission channel according to each difference includes: taking the difference AB1 as the relative transmission loss of the first transmission channel and the second transmission channel

[0019] In one embodiment, between the step of reading the second power value group and the step of calculating the transmission loss, the following step is further included:

[0020] Controlling each coupling lens of the optical module to move along a direction parallel to the arrangement direction of each optical chip so that each coupling lens and each optical chip are in a third relative position; wherein the third relative position is different from the first relative position and the second relative position,

[0021] After the movement is completed, the power value group of each transmission channel of the optical fiber line to be evaluated measured by the optical power meter is read as the third power value group;

[0022] In the step of calculating the transmission loss, the value combination set further includes the third power value group.

[0023] In one embodiment, between the step of calculating the difference between the power values ​​of the transmission channels corresponding to the optical chips at different relative positions and the step of determining the relative transmission loss of each transmission channel based on the differences, the method further includes:

[0024] If the difference between the power values ​​of the same two transmission channels can be calculated based on different optical chips at different relative positions and the values ​​are different, then an average of the different calculated differences is taken;

[0025] The step of determining the relative transmission loss of each transmission channel according to each difference includes: determining the relative transmission loss of each transmission channel according to each average value.

[0026] In one embodiment, the transmission channel further includes a third transmission channel, the optical chip further includes a second optical chip and a third optical chip, and the coupling lens further includes a third coupling lens;

[0027] In the step of reading the first power value group, at the first relative position, the second optical chip is coupled to the second coupling lens, and the laser light generated by the second optical chip enters the second transmission channel, and the third optical chip is coupled to the third coupling lens, and the laser light generated by the third optical chip enters the third transmission channel; the first power value group also includes power values ​​1B2-b and 1C3-c, where 1B2-b represents the power value of the second transmission channel read at the first relative position; and 1C3-c represents the power value of the third transmission channel read at the first relative position;

[0028] In the step of reading the second power value group, at the second relative position, the second optical chip is coupled to the third coupling lens, and the laser light generated by the second optical chip enters the third transmission channel; the second power value group also includes a power value 2BA2-c, where 2BA2-c represents the power value of the third transmission channel read at the second relative position;

[0029] In the step of reading the third power value group, at the third relative position, the second optical chip is coupled to the first coupling lens, and the laser light generated by the second optical chip enters the first transmission channel; the third optical chip is coupled to the second coupling lens, and the laser light generated by the third optical chip enters the second transmission channel; the third power value group includes power values ​​3A2-a and 3B3-b, wherein 3A2-a represents the power value of the first transmission channel read at the third relative position, and 3B3-b represents the power value of the second transmission channel read at the third relative position;

[0030] The step of calculating the difference between the power values ​​of the transmission channels corresponding to the optical chips at different relative positions further includes: calculating the difference AB2 between the power value 3A2-a and the power value 1B2-b, calculating the difference BC1 between the power value 1B2-b and the power value 2BA2-c, and calculating the difference BC2 between the power value 1C3-c and the power value 3B3-b;

[0031] The step of determining the relative transmission loss of each transmission channel according to each difference includes: taking the average value AB of the differences AB1 and AB2 as the relative transmission loss between the first transmission channel and the second transmission channel, and taking the average value BC of the differences BC1 and BC2 as the relative transmission loss between the second transmission channel and the third transmission channel.

[0032] In one embodiment, in the second relative position, the second coupling lens is located on the left side of the first optical chip; in the third relative position, the second coupling lens is located on the right side of the first optical chip.

[0033] In one embodiment, after the step of calculating the relative transmission loss, the method further includes:

[0034] Assigning a value to the actual transmission loss of any transmission channel of the optical fiber line to be evaluated, referring to the empirical value of the transmission loss of a single transmission channel of an existing optical fiber line;

[0035] In combination with the calculated relative transmission losses of the transmission channels, the actual transmission losses of the remaining transmission channels that are not assigned are determined based on the assigned transmission channels.

[0036] In one embodiment, the optical module further includes an electrical terminal; and the step of enabling the optical module to cause each optical chip to radiate laser light includes:

[0037] connecting the electrical terminal to an optical module coupler;

[0038] The optical module coupler inputs specific power to the electrical end.

[0039] In the aforementioned method for evaluating the relative transmission loss of an optical fiber, compared to the fiber manufacturer's test environment, since the optical fiber is in a real-world environment connected to an optical module and power meter, additional connection loss caused by port and operational factors is reflected in the test data during the test process. The aforementioned difference calculation eliminates this additional connection loss, thus allowing the aforementioned evaluation method to obtain a relatively accurate relative transmission loss.

[0040] Another aspect of the present application provides a system for evaluating the relative transmission loss of an optical fiber line, comprising:

[0041] An optical module, comprising a light emitting end and an electrical end, wherein the light emitting end comprises an optical chip and a coupling lens, wherein the coupling lens is used to couple to one end of a transmission channel of an optical fiber to be evaluated;

[0042] A power meter comprising a light receiving end, the light receiving end being coupled to the other end opposite to the transmission channel of the optical fiber line to be evaluated;

[0043] An optical module coupler is connected to the electrical terminal and inputs a specific power to the electrical terminal to enable the optical module to cause each optical chip to radiate laser light. The laser light is coupled by the coupling lens and enters the transmission channel of the optical fiber to be evaluated. The optical module coupler also includes an MCU microcontroller module, including a memory and a controller, wherein:

[0044] The memory is used to store program instructions;

[0045] The controller is used to call and execute the program instructions in the memory to implement the method for evaluating the relative transmission loss of an optical fiber line as described in any of the above items.

[0046] In another aspect, the present application provides a method for debugging an optical module, which involves an optical fiber to be evaluated, which has been evaluated by the method for evaluating the relative transmission loss of an optical fiber as described in any of the preceding items and has obtained a relative transmission loss. The optical fiber to be evaluated includes multiple transmission channels, which are optically coupled between a light emitting end of the optical module and a light receiving end of a power meter. The light emitting end includes an optical chip and a coupling lens. Laser light generated by the optical chip enters the transmission channel after being coupled by the coupling lens. The method includes the following steps:

[0047] enabling the optical module to cause each optical chip to radiate laser light;

[0048] Reading a preliminary power value group of each transmission channel of the optical fiber line;

[0049] Compensating the relative transmission loss of each optical channel to the preliminary power value set;

[0050] The photoelectric conversion module and / or the electro-optical conversion module of the optical module is adjusted according to the supplemented power value group.

[0051] In one embodiment, the step of adjusting the photoelectric conversion module and / or the electro-optical conversion module includes:

[0052] The driving current of the light source module of each optical chip is adjusted according to the supplemented power value group.

[0053] The system for evaluating the relative transmission loss of an optical fiber and the method for debugging an optical module according to the above embodiments have the same features as the method for evaluating the relative transmission loss of an optical fiber, and thus have the same beneficial effects as mentioned above. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0055] Figure 1 1 is a schematic diagram of a system for evaluating the relative transmission loss of an optical fiber provided in an embodiment of the present application, which shows a schematic diagram of an optical chip and a coupling lens of an optical module.

[0056] Figure 2 This is a flow chart of a method for evaluating the relative transmission loss of an optical fiber line according to one embodiment of the present application.

[0057] Figure 3 This is a schematic diagram of the relative positions of the optical chip and the coupling lens according to one embodiment of the present application.

[0058] Figure 4 It is a flowchart of another method for evaluating the relative transmission loss of an optical fiber line according to one embodiment of the present application.

[0059] Figure 5 It is a flowchart of another method for evaluating the relative transmission loss of an optical fiber line according to one embodiment of the present application.

[0060] Figure 6 This is a schematic diagram of the relative positions of the optical chip and the coupling lens in another embodiment of the present application.

[0061] Figure 7 It is a flowchart of another method for evaluating the relative transmission loss of an optical fiber line according to one embodiment of the present application.

[0062] Figure 8 This is a schematic diagram of the relative positions of the optical chip and the coupling lens in another embodiment of the present application.

[0063] Figure 9 It is a flowchart of another method for evaluating the relative transmission loss of an optical fiber line according to one embodiment of the present application.

[0064] Figure 10 This is a schematic diagram of the relative positions of the optical chip and the coupling lens in another embodiment of the present application.

[0065] Figure 11 This is a schematic diagram of the relative positions of the optical chip and the coupling lens in another embodiment of the present application.

[0066] Figure 12 This is a schematic diagram of the relative positions of the optical chip and the coupling lens in another embodiment of the present application.

[0067] Figure 13 This is a flowchart of a debugging method for an optical module according to one embodiment of the present application.

[0068] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0069] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0070] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0071] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0072] In addition, the descriptions of "first", "second", etc. in this application are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the said features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0073] Please combine Figure 1 , the present application provides a method for evaluating the relative transmission loss of an optical fiber line, involving the following equipment: an optical fiber line 10 to be evaluated, a power meter 20 for measuring optical power, an optical module 30, and an optical module coupler 40. The optical fiber line 10 includes multiple transmission channels. The power meter 20 includes an optical receiving end 22 for connecting the transmission channels of the optical fiber line 10. The optical module 30 includes an electrical end 32 and an optical transmitting end 34. The electrical end 32 is used to receive an external electrical signal input to the optical module 30 or output an electrical signal to the outside; the optical transmitting end includes multiple optical chips 36 and a coupling lens 38 coupled to each optical chip 36. The opposite ends of the optical fiber line 10 are connected to the optical module 30 and the power meter 20 respectively, so that each transmission channel is optically coupled between the optical transmitting end of the optical module 30 and the optical receiving end 22 of the power meter 20. The laser generated by the optical chip 36 enters the transmission channel after coupling through the coupling lens 38, and can be measured by the power meter 20. Figure 1 In this embodiment, an optical fiber 10 includes four transmission channels, namely, transmission channels A, B, C, and D. Correspondingly, the optical transmitter includes four optical chips 1, 2, 3, and 4 and four coupling lenses a, b, c, and d; and the power meter 20 includes four optical receivers 22. It should be noted that in other embodiments, the aforementioned numbers may vary depending on the actual configuration of the optical fiber 10.

[0074] As one aspect of the present application, the present application provides a method for evaluating the relative transmission loss of an optical fiber line, and various embodiments of the method are as follows.

[0075] Please combine again Figure 2 and Figure 3 The method for evaluating the relative transmission loss of an optical fiber provided in this embodiment includes the following steps:

[0076] Enable the optical module 30 to enable each optical chip 36 to radiate laser. Specifically, first connect the electrical end 32 of the optical module 30 to the optical module coupler 40; then the optical module coupler 40 inputs a specific power to the electrical end 32. According to the working principle of the optical module 30, after receiving the input specific power, each optical chip 36 will radiate laser. It should be noted that the specific refers to a certain amount in the test scenario, in order to facilitate the measurement and comparison of subsequent data, rather than the need to limit the input power to a certain range during the execution of this method. In this step, the optical chip 36 and the coupling lens 38 are currently in a first relative position, such as Figure 3-1 As shown, optical chips 1, 2, 3, and 4 are respectively coupled to coupling lenses a, b, c, and d in a one-to-one correspondence, and the lasers generated by optical chips 1, 2, 3, and 4 enter transmission channels A, B, C, and D, respectively.

[0077] The power value group of each transmission channel of the optical fiber 10 measured by the optical power meter 20 is read as a first power value group. Specifically, at the current first relative position, the power values ​​of transmission channels A, B, C, and D are read as 1A1-a, 1B2-b, 1C3-c, and 1D4-d, respectively. As an embodiment, the specific values ​​are shown in Table 1.

[0078] Table 1: Power values ​​of one embodiment

[0079]

[0080] The coupling lenses 38 of the optical module 30 are controlled to move in a direction parallel to the arrangement direction of the optical chips 36, so that the coupling lenses 38 and the optical chips 36 are in a second relative position; wherein the second relative position is different from the first relative position. Specifically, the movement of the coupling lenses 38 relative to the optical chips 36 is performed by the optical module coupling machine 40. The optical module coupling machine 40 includes a fixture for clamping the coupling lenses 38, and a linear motor connected to and driving the fixture. Through the drive of the linear motor, the coupling lenses 38 are translated as a whole relative to the optical chips 36. Figure 3-2 As shown, in this embodiment, each coupling lens 38 is translated to the left by a unit distance relative to each optical chip 36, and the unit distance shown refers to the distance between adjacent optical chips 36. At this time, the optical chip 36 and the coupling lens 38 are currently in the second relative position, such as Figure 3-2 As shown, the optical chips 1, 2, and 3 are in a one-to-one corresponding relative position relationship with the coupling lenses b, c, and d, respectively, and the lasers generated by the optical chips 1, 2, and 3 enter the transmission channels B, C, and D, respectively.

[0081] After the movement is completed, the power value group of each transmission channel of the optical fiber line 10 measured by the optical power meter 20 is read as the second power value group. Specifically, at the current second relative position, the power values ​​of transmission channels B, C, and D are read as 2A1-b, 2B2-c, and 2C3-d, respectively. As an embodiment, the specific values ​​are shown in Table 1.

[0082] The relative transmission loss of each transmission channel of the optical fiber line 10 is calculated by taking the difference between the corresponding power values ​​in the value combination set, wherein the value combination set includes the first power value group and the second power value group. Specifically, in this embodiment, the step of calculating the relative transmission loss includes: calculating the difference between the power values ​​of the transmission channels corresponding to each optical chip and each coupling lens at different relative positions according to the value combination set; determining the relative transmission loss of each transmission channel according to each difference, such as Figure 4 As shown. Specifically, the optical chip 1 corresponds to the transmission channel A and the transmission channel B in the first and second relative positions, respectively. Therefore, the difference AB1 between the power value 1A1-a and the power value 2A1-b is calculated. Similarly, the difference BC1 between the power value 1B2-b and the power value 2B2-c is calculated, and the difference CD1 between the power value 1C3-c and the power value 2C3-d is calculated. The difference AB1 is taken as the relative transmission loss between the transmission channel A and the transmission channel B, the difference BC1 is taken as the relative transmission loss between the transmission channel B and the transmission channel C, and the difference CD1 is taken as the relative transmission loss between the transmission channel C and the transmission channel D. As an embodiment, its specific values ​​are shown in Table 1.

[0083] It should be noted that the aforementioned difference AB1 is a positive number, 0.041, indicating that the power value read from transmission channel A is 0.041 dBm greater than that read from transmission channel B. Therefore, it should be understood that if the difference BA1 is a negative number in certain embodiments, it means that the power value read from transmission channel B is smaller than that read from transmission channel A.

[0084] Thus, in the aforementioned method for evaluating the relative transmission loss of an optical fiber, compared to the optical fiber manufacturer's test environment, since the optical fiber 10 is in the actual environment connected to the optical module 30 and the power meter 20, additional connection loss caused by port and operational factors is reflected in the test data during the test process. The aforementioned difference calculation process eliminates this additional connection loss, thus, the aforementioned evaluation method can obtain a relatively accurate relative transmission loss.

[0085] Furthermore, for ease of labeling, Figure 5 As shown, after the aforementioned step of calculating relative transmission loss, the method further includes: assigning a value to the actual transmission loss of any transmission channel of the optical fiber to be evaluated, referring to empirical transmission loss values ​​for a single transmission channel of an existing optical fiber; and, based on the calculated relative transmission losses of each transmission channel, determining the actual transmission losses of the remaining unassigned transmission channels, based on the assigned transmission channels. Specifically, as shown in Table 1, the difference AB1 between the power values ​​1A1-a and 2A1-b is 0.041 dBm, indicating that the power value read from transmission channel A is 0.041 dBm greater than that from transmission channel B. Therefore, it can be determined that the power loss of transmission channel A (denoted as ΔA, the same below) is 0.041 dBm less than ΔB. Similarly, the difference BC1 is -0.099 dBm, indicating that ΔB is 0.099 dBm greater than ΔC. This also indirectly indicates that ΔA is 0.058 dBm greater than ΔC. The difference CD1 of 0.51 dBm indicates that ΔC is 0.51 dBm smaller than ΔD, and indirectly indicates that ΔD is 0.411 dBm larger than ΔB. In other words, ΔD is 0.411 dBm larger than ΔB, ΔB is 0.041 dBm larger than ΔA, and ΔA is 0.058 dBm larger than ΔC. Referring to the empirical transmission loss values ​​for a single transmission channel in existing optical fiber lines, the actual transmission loss of transmission channel C, which has the lowest transmission loss, can be assigned a value of 0.1 dBm. Based on this assigned value for transmission channel C and the calculated relative transmission losses of each transmission channel (i.e., the aforementioned relative transmission losses of ΔD being 0.411 dBm greater than ΔB, ΔB being 0.041 dBm greater than ΔA, and ΔA being 0.058 dBm greater than ΔC), the actual transmission losses of the remaining unassigned transmission channels can be determined as follows: 0.1 + 0.058 = 0.158 dBm for transmission channel A, 0.199 dBm for transmission channel B, and 0.61 dBm for transmission channel D. This actual transmission loss allows for a quick overview of the relative transmission losses of each channel, making it easier to view the relative transmission losses of each channel. It should be understood that in other implementations, the actual transmission losses of other transmission channels may also be assigned first.

[0086] It should be noted that in this embodiment, an optical module coupler 40 is used to output a specific power to the optical module 30 to cause each optical chip 36 of the optical module 30 to radiate laser light. However, in other embodiments, another device can be used as long as it can cause each optical chip 36 to radiate laser light. In other words, the optical module coupler 40 can be used to cause each optical chip 36 to radiate laser light. Similarly, in this embodiment, an optical module coupler 40 is used to move each coupling lens 38 parallel to the arrangement direction of each optical chip 36. It should be understood that in other embodiments, other devices can also be used to achieve this displacement. In other embodiments, the relative transmission loss of each transmission channel can be manually input or calculated by manually reading the power value group, rather than being limited to the embodiment of this application, where the optical module coupler 40 automatically reads the power meter 20 and then automatically calculates and compensates through program settings.

[0087] Please combine Figure 6 The method for evaluating the relative transmission loss of an optical fiber provided in this embodiment is similar to Figure 2 and Figure 3 The difference between the corresponding embodiments is that each coupling lens 38 is shifted to the right by a unit distance relative to each optical chip 36, such as Figure 6-2 As shown. It can be understood that under this difference, the detection and calculation process of each data in this embodiment is different from Figure 2 and Figure 3 The corresponding embodiments are similar and will not be described in detail here. It should be noted that in other embodiments, the translation distance of each coupling lens 38 relative to each optical chip 36 is not limited to a unit distance. An appropriate translation distance can be selected based on the number of transmission channels of the optical fiber line 10, as long as the relative transmission loss of each transmission channel can be obtained.

[0088] It is easy to see from the various embodiments described above that under the simplest conditions, that is, when the transmission channel only includes two transmission channels and the optical transmitting end only includes two optical chips 36 and two coupling lenses 38: in the step of reading the first power value group, the first power value group includes the power value 1A1-a; in the step of reading the second power value group, the second power value group includes the power value 2A1-b; the step of calculating the relative transmission loss includes first calculating the difference AB1 between the power value 2A1-b and the power value 1A1-a, and then taking the difference AB1 as the relative transmission loss between the first transmission channel and the second transmission channel.

[0089] Please combine Figure 7 and Figure 8 The method for evaluating the relative transmission loss of an optical fiber provided in this embodiment is similar to Figure 2 and Figure 3The difference between the corresponding embodiments is that, between the step of reading the second power value group and the step of calculating the transmission loss, the following step is further included:

[0090] The coupling lenses 38 of the optical module 30 are controlled to move in a direction parallel to the arrangement direction of the optical chips 36 so that the coupling lenses 38 and the optical chips 36 are in a third relative position; wherein the third relative position is different from the first relative position and the second relative position. Specifically, the movement of the coupling lenses 38 relative to the optical chips 36 can also be performed by the optical module coupler 40. In this embodiment, the relative Figure 8-1 The first relative position shown, as Figure 8-3 The coupling lenses 38 are shown as being shifted to the right by a unit distance relative to the optical chips 36. At this point, the optical chips 36 and the coupling lenses 38 are currently in a third relative position, such as Figure 8-3 As shown, at this time, the optical chips 2, 3, and 4 are in a one-to-one corresponding relative position relationship with the coupling lenses a, b, and c, respectively, and the lasers generated by the optical chips 2, 3, and 4 enter the transmission channels A, B, and C respectively.

[0091] After the movement is completed, the optical power meter 20 reads the power values ​​for each transmission channel of the optical fiber 10 as the third power value set. Specifically, at the current third relative position, the power values ​​for transmission channels A, B, and C are read as 3A2-a, 3B3-b, and 3C4-c, respectively. As an embodiment, the specific values ​​are shown in Table 2.

[0092] Table 2: Power values ​​of another embodiment

[0093]

[0094] The relative transmission loss of each transmission channel of the optical fiber line 10 is calculated by taking the difference of the corresponding power values ​​in the value combination set, wherein the value combination set includes the first power value group, the second power value group and the third power value group.

[0095] Specifically, in this embodiment, Figure 9 As shown, the step of calculating the relative transmission loss includes: calculating the difference between the power values ​​of the transmission channels corresponding to each optical chip and each coupling lens at different relative positions based on the value combination set; if the difference between the power values ​​of the same two transmission channels can be calculated based on different optical chips at different relative positions and the values ​​are different, then taking an average of the different calculated differences; and determining the relative transmission loss of each transmission channel based on each average value.

[0096] Specifically, the difference AB1 between power values ​​1A1-a and 2A1-b, the difference BC1 between power values ​​1B2-b and 2B2-c, the difference CD1 between power values ​​1C3-c and 2C3-d, the difference AB2 between power values ​​3A2-a and 1B2-b, the difference BC2 between power values ​​3B2-b and 1C3-c, and the difference CD2 between power values ​​3C4-c and 1D4-d are calculated. The power differences AB1 and AB2 between transmission channels A and B are calculated based on the relative positions of optical chips 1 and 2, respectively. Since AB1 is not equal to AB2, the average AB of the calculated differences AB1 and AB2 is calculated, resulting in an average AB of 0.038 dBm. Similarly, the average value BC of the difference BC1 and the difference BC2 is calculated to be -0.0955 dBm, and the average value CD of the difference CD1 and the difference CD2 is calculated to be 0.5345 dBm. The average value AB is then used as the relative transmission loss between the first and second transmission channels, the average value BC is used as the relative transmission loss between the second and third transmission channels, and the average value CD is used as the relative transmission loss between the third and fourth transmission channels.

[0097] Thus, in the aforementioned method for evaluating the relative transmission loss of an optical fiber line, compared to the first embodiment, the relative transmission loss of each transmission channel is based on the average of the two obtained values, which can further improve the accuracy of the obtained relative transmission loss.

[0098] Similarly, it should be pointed out that in other embodiments, the translation distance of each coupling lens 38 relative to each optical chip 36 is not limited to a unit distance. A suitable translation distance can be selected according to the number of transmission channels of the optical fiber line 10, as long as the relative transmission loss of each transmission channel can be obtained.

[0099] Similarly, corresponding Figure 2 and Figure 3The steps for setting the relative transmission loss value in the corresponding embodiment are as follows in this embodiment: From the average value AB = 0.038 dBm, we know that ΔA is 0.038 dBm smaller than ΔB. From the average value BC = -0.0955 dBm, we know that ΔB is 0.0955 dBm larger than ΔC; this also indirectly indicates that ΔA is 0.0575 dBm larger than ΔC. From the average value CD = 0.5345 dBm, we know that ΔC is 0.5345 dBm smaller than ΔD; this also indirectly indicates that ΔD is 0.439 dBm larger than ΔB. In other words, ΔD is 0.439 dBm larger than ΔB, ΔB is 0.038 dBm larger than ΔA, and ΔA is 0.0575 dBm larger than ΔC. Alternatively, based on AC1=-0.064 dBm in Table 2 and the previously derived ΔA being 0.0575 dBm greater than ΔC, the corresponding data can be averaged to obtain an average ΔA being 0.06075 dBm greater than ΔC. Similarly, based on BD1=0.418 dBm in Table 2 and the previously derived ΔD being 0.439 dBm greater than ΔB, the average ΔD being 0.04285 dBm greater than ΔB can be obtained. Figure 2 and Figure 3 In the same manner as the corresponding embodiment, the actual transmission loss of the transmission channel C with the smallest transmission loss can be set to 0.1 dBm, and the actual transmission losses of other transmission channels can be obtained. This will not be described in detail here.

[0100] Please combine Figure 10 The method for evaluating the relative transmission loss of an optical fiber provided in this embodiment is similar to Figure 7 and Figure 8 The difference between the corresponding embodiments is that, in the third relative position, compared with the first relative position, each coupling lens 38 is translated to the right by more than one unit distance relative to each optical chip 36, such as Figure 10-3 It should be noted that, in the second relative position, compared with the first relative position, each coupling lens 38 is translated to the left by more than one unit distance relative to each optical chip 36. It should also be understood that Figure 11 As shown, in the third relative position, compared with the first relative position, the moving direction of each coupling lens 38 relative to each optical chip 36 is the same as the moving direction at the second relative position, as shown in FIG. Figure 11-2 Right now Figure 11-3 It should also be understood that in other embodiments, the implementation process of the entire method may have more relative positions, such as Figure 12 As shown, there are 5 relative positions, namely, except Figure 12-1 The first relative position shown may include Figure 12-2That is, as shown in 12-3: compared with the first relative position, each coupling lens 38 is translated to the left by 1 and 2 unit distances relative to each optical chip 36; and Figure 12-4 That is, as shown in 12-5: compared with the first relative position, each coupling lens 38 is translated to the right by 1 and 2 unit distances relative to each optical chip 36. It can be understood that under the above differences, the detection and calculation process of each data is the same as Figure 7 and Figure 8 The corresponding embodiments are similar and will not be described in detail here.

[0101] As another aspect of the present application, the present application provides a debugging method for an optical module, such as Figure 13 As shown, the method involves an optical fiber line that has been evaluated and has obtained relative transmission loss using the method for evaluating relative transmission loss of an optical fiber line as described in any of the aforementioned embodiments. The optical fiber line includes multiple transmission channels, each of which is optically coupled between an optical transmitter end of an optical module and an optical receiver end of a power meter. The optical transmitter end includes an optical chip and a coupling lens. Laser light generated by the optical chip is coupled by the coupling lens into the transmission channels. The method includes the following steps:

[0102] enabling the optical module to cause each optical chip to radiate laser light;

[0103] Reading a preliminary power value group of each transmission channel of the optical fiber line;

[0104] Compensating the relative transmission loss of each optical channel to the preliminary power value set;

[0105] The photoelectric conversion module and / or the electro-optical conversion module of the optical module is adjusted according to the supplemented power value group.

[0106] The step of adjusting the photoelectric conversion module and / or the electro-optical conversion module includes adjusting the driving current of the light source module of each optical chip according to the supplemented power value group.

[0107] As another aspect of this application, Figure 1As shown, the present application provides a system for evaluating the relative transmission loss of an optical fiber, comprising an optical module 30, a power meter 20, and an optical module coupler 40. The optical module 30 includes an optical transmitter 34 and an electrical terminal 32. The optical transmitter includes an optical chip 36 and a coupling lens 38. The coupling lens 38 is used to couple to one end of the transmission channel of the optical fiber 10. The power meter 20 includes an optical receiver 22, which is used to couple to the opposite end of the transmission channel of the optical fiber 10. The optical module coupler 40 is connected to the electrical terminal 32 and inputs a specific power into the electrical terminal 32 to enable the optical module 30 to cause each optical chip 38 to radiate laser light. The laser light is coupled through the coupling lens 38 and enters the transmission channel of the optical fiber 10. The optical module coupler 40 also includes an MCU microcontroller 42, which includes a memory 44 and a controller 46. The memory 44 is used to store program instructions. The controller 46 is used to call and execute the program instructions in the memory 44 to implement the method for evaluating the relative transmission loss of an optical fiber as described in any of the aforementioned embodiments.

[0108] The above description is only a preferred embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made based on the contents of the present application specification and drawings, or direct / indirect application in other related technical fields, are included in the patent protection scope of the present application.

Claims

1. A method for evaluating the relative transmission loss of an optical fiber, wherein the optical fiber to be evaluated includes multiple transmission channels, the transmission channels optically coupled between a light emitting end of an optical module and a light receiving end of a power meter, the light emitting end including an optical chip and a coupling lens, the optical chip and the coupling lens currently being in a first relative position, and laser light generated by the optical chip entering the transmission channels after being coupled by the coupling lens; characterized in that: The method comprises the following steps: enabling the optical module to cause each optical chip to radiate laser light; Reading a power value group of each transmission channel of the optical fiber line to be evaluated measured by an optical power meter as a first power value group; Controlling each coupling lens of the optical module to move in a direction parallel to the arrangement direction of each optical chip so that each coupling lens and each optical chip are in a second relative position; wherein the second relative position is different from the first relative position; After the movement is completed, the power value group of each transmission channel of the optical fiber line to be evaluated measured by the optical power meter is read as the second power value group; The relative transmission loss of each transmission channel of the optical fiber to be evaluated is calculated by taking the difference between the corresponding power values ​​in the value combination set, wherein the value combination set includes the first power value group and the second power value group.

2. The method for evaluating the relative transmission loss of an optical fiber according to claim 1, wherein: The step of calculating the relative transmission loss comprises: Calculating the difference between the power values ​​of the transmission channels corresponding to the different relative positions of each optical chip and each coupling lens according to the value combination set; The relative transmission loss of each transmission channel is determined based on the respective differences.

3. The method for evaluating the relative transmission loss of an optical fiber according to claim 2, wherein: The transmission channel includes a first transmission channel and a second transmission channel, the optical chip includes a first optical chip, and the coupling lens includes a first coupling lens and a second coupling lens; In the step of reading the first power value group, at the first relative position, the first optical chip is coupled to the first coupling lens, and laser light generated by the first optical chip enters the first transmission channel; the first power value group includes power values ​​1A1-a, where 1A1-a represents the power values ​​of the first transmission channel read at the first relative position; In the step of reading the second power value group, at the second relative position, the first optical chip is coupled to the second coupling lens, and the laser light generated by the first optical chip enters the second transmission channel; the second power value group includes power values ​​2A1-b, where 2A1-b represents the power values ​​of the second transmission channel read at the second relative position; The step of calculating the difference between the power values ​​of the transmission channels corresponding to the optical chips at different relative positions includes: calculating the difference AB1 between the power value 2A1-b and the power value 1A1-a; The step of determining the relative transmission loss of each transmission channel according to each difference includes: using the difference AB1 as the relative transmission loss between the first transmission channel and the second transmission channel.

4. The method for evaluating the relative transmission loss of an optical fiber according to claim 3, wherein: Between the step of reading the second power value group and the step of calculating the relative transmission loss, the following step is also included: Controlling each coupling lens of the optical module to move in a direction parallel to the arrangement direction of each optical chip so that each coupling lens and each optical chip are in a third relative position; wherein the third relative position is different from the first relative position and the second relative position, After the movement is completed, the power value group of each transmission channel of the optical fiber line to be evaluated measured by the optical power meter is read as the third power value group; In the step of calculating the relative transmission loss, the value combination set further includes the third power value group.

5. The method for evaluating the relative transmission loss of an optical fiber according to claim 4, wherein: Between the step of calculating the difference between the power values ​​of the transmission channels corresponding to the optical chips at different relative positions and the step of determining the relative transmission loss of the transmission channels according to the differences, the method further includes: If the difference between the power values ​​of the same two transmission channels can be calculated based on different optical chips at different relative positions and the values ​​are different, then an average of the different calculated differences is taken; The step of determining the relative transmission loss of each transmission channel according to each difference includes: determining the relative transmission loss of each transmission channel according to each average value.

6. The method for evaluating the relative transmission loss of an optical fiber according to claim 5, wherein: The transmission channel further includes a third transmission channel, the optical chip further includes a second optical chip and a third optical chip, and the coupling lens further includes a third coupling lens; In the step of reading the first power value group, at the first relative position, the second optical chip is coupled to the second coupling lens, and the laser light generated by the second optical chip enters the second transmission channel, and the third optical chip is coupled to the third coupling lens, and the laser light generated by the third optical chip enters the third transmission channel; the first power value group also includes power values ​​1B2-b and 1C3-c, where 1B2-b represents the power value of the second transmission channel read at the first relative position; and 1C3-c represents the power value of the third transmission channel read at the first relative position; In the step of reading the second power value group, at the second relative position, the second optical chip is coupled to the third coupling lens, and the laser light generated by the second optical chip enters the third transmission channel; the second power value group also includes a power value 2BA2-c, where 2BA2-c represents the power value of the third transmission channel read at the second relative position; In the step of reading the third power value group, at the third relative position, the second optical chip is coupled to the first coupling lens, and the laser light generated by the second optical chip enters the first transmission channel; the third optical chip is coupled to the second coupling lens, and the laser light generated by the third optical chip enters the second transmission channel; the third power value group includes power values ​​3A2-a and 3B3-b, wherein 3A2-a represents the power value of the first transmission channel read at the third relative position, and 3B3-b represents the power value of the second transmission channel read at the third relative position; The step of calculating the difference between the power values ​​of the transmission channels corresponding to the optical chips at different relative positions further includes: calculating the difference AB2 between the power value 3A2-a and the power value 1B2-b, calculating the difference BC1 between the power value 1B2-b and the power value 2BA2-c, and calculating the difference BC2 between the power value 1C3-c and the power value 3B3-b; The step of determining the relative transmission loss of each transmission channel according to each difference includes: taking the average value AB of the differences AB1 and AB2 as the relative transmission loss between the first transmission channel and the second transmission channel, and taking the average value BC of the differences BC1 and BC2 as the relative transmission loss between the second transmission channel and the third transmission channel.

7. The method for evaluating the relative transmission loss of an optical fiber according to claim 4, wherein: In the second relative position, the second coupling lens is located on the left side of the first optical chip; in the third relative position, the second coupling lens is located on the right side of the first optical chip.

8. The method for evaluating the relative transmission loss of an optical fiber according to any one of claims 1 to 7, wherein: After the step of calculating the relative transmission loss, the method further includes: Assigning a value to the actual transmission loss of any transmission channel of the optical fiber line to be evaluated, referring to the empirical value of the transmission loss of a single transmission channel of an existing optical fiber line; In combination with the calculated relative transmission losses of the transmission channels, the actual transmission losses of the remaining transmission channels that are not assigned are determined based on the assigned transmission channels.

9. The method for evaluating the relative transmission loss of an optical fiber according to claim 1, wherein: The optical module further includes an electrical terminal; and the step of enabling the optical module to cause each optical chip to radiate laser light includes: connecting the electrical terminal to an optical module coupler; The optical module coupler inputs specific power to the electrical end.

10. A system for evaluating relative transmission loss of an optical fiber line, characterized in that: include: An optical module, comprising a light emitting end and an electrical end, wherein the light emitting end comprises an optical chip and a coupling lens, wherein the coupling lens is used to couple to one end of a transmission channel of an optical fiber to be evaluated; A power meter comprising a light receiving end, the light receiving end being coupled to the other end opposite to the transmission channel of the optical fiber line to be evaluated; an optical module coupler connected to the electrical terminal and inputting a specific power into the electrical terminal to enable the optical module to cause each optical chip to radiate laser light, and the laser light is coupled by the coupling lens and enters the transmission channel of the optical fiber to be evaluated; The optical module coupling machine also includes an MCU microcontroller module, including a memory and a controller, wherein: The memory is used to store program instructions; The controller is used to call and execute the program instructions in the memory to implement the method for evaluating the relative transmission loss of an optical fiber line according to any one of claims 1 to 9.

11. A debugging method for an optical module, characterized in that: The present invention relates to an optical fiber to be evaluated, which has been evaluated by the method for evaluating the relative transmission loss of an optical fiber according to any one of claims 1 to 9 and has obtained a relative transmission loss. The optical fiber to be evaluated includes multiple transmission channels, the transmission channels are optically coupled between a light emitting end of an optical module and a light receiving end of a power meter, the light emitting end includes an optical chip and a coupling lens, and laser light generated by the optical chip enters the transmission channel after being coupled by the coupling lens. The method includes the following steps: enabling the optical module to cause each optical chip to radiate laser light; Reading a preliminary power value group of each transmission channel of the optical fiber line; Compensating the relative transmission loss of each optical channel to the preliminary power value set; The photoelectric conversion module and / or the electro-optical conversion module of the optical module is adjusted according to the compensated power value group.

12. The optical module debugging method according to claim 11, wherein: The step of adjusting the photoelectric conversion module and / or the electro-optical conversion module of the optical module includes: The driving current of the light source module of each optical chip is adjusted according to the compensated power value group.

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