Laser transmitting and receiving device, optical axis self-calibration method and machine readable storage medium

Abstract

The invention relates to a laser transmitting and receiving device, an optical axis self-calibration method and a machine readable storage medium. The laser transmitting-receiving device comprises an optical head space optical path, a transmitting optical fiber, a receiving optical fiber and an optical amplifier. The optical amplifier comprises: a first optical amplifier assembly configured to be connected to a transmitting mirror group at an output end via a transmitting optical fiber; a second optical amplifier assembly configured to be connected to the receiving lens group at an input end via a receiving optical fiber; the calibration light supply device is arranged in the optical amplifier and is configured to be associated with the first optical amplifier assembly so as to emit calibration light to the emitting optical fiber by utilizing the output end of the first optical amplifier assembly; and an optical power detector disposed inside the optical amplifier and connected to the second optical amplifier assembly. The calibration light is provided to the position detector via the transmitting mirror set for a first measurement of optical axis self-calibration, and is provided to the optical power detector for a second measurement of optical axis self-calibration after passing through the receiving mirror set.

Description

Technical Field

[0001] The present invention relates to the technical field of inter-satellite laser communication, in particular to a laser transceiver with an optical axis self-calibration function, a method for performing optical axis self-calibration on the laser transceiver, and a machine-readable storage medium. Background Art

[0002] Space laser communication technology combines the advantages of radio and fiber-optic communications, using lasers as carrier waves and the atmosphere as a communication channel. It boasts strong anti-interference capabilities, high security, high communication rates, fast transmission speeds, convenient band selection, and large information capacity. Because the optical axis of the laser intersatellite link terminal is coaxially calibrated on a ground-based optical status platform, it can vary after orbit due to atmospheric pressure, temperature, turbulence, and lead angles, resulting in axial deviation. For example, in actual use, laser communication terminals can be affected by environmental factors such as force and heat, leading to separation of the transmitting and receiving optical axes and deviation of the tracking point.

[0003] Traditional solutions typically add an additional optical path, assuming the relative relationship between the additional optical path and the original communication path remains unchanged. Changes in the optical axis are detected by monitoring the changes in the additional optical path. However, this approach requires calibrating the relationship between the communication optical path and the calibration optical path in the laboratory and repeating the calibration in a vacuum tank. This calibration process is complex and cannot guarantee that the relative relationship will not change while in orbit.

[0004] In addition, some existing on-orbit calibrations usually require the introduction of many additional components and devices to complete the optical axis calibration function, which increases the calibration cost of the laser communication terminal, complicates the equipment control function, and may interfere with the original function of the laser communication terminal, thereby reducing the reliability of the laser communication terminal.

[0005] In summary, the traditional optical axis self-calibration solution has the following shortcomings: it requires additional components and devices to complete the optical axis calibration function, requires laboratory calibration, and the calibration results are easily affected by the environment. Summary of the Invention

[0006] The present invention provides a laser transceiver with an optical axis self-calibration function, a method for performing optical axis self-calibration on the laser transceiver, and a machine-readable storage medium. The laser transceiver can be calibrated with the help of existing devices, does not require laboratory calibration, and the calibration results are not affected by the environment.

[0007] According to a first aspect of the present invention, a laser transceiver device with an optical axis self-calibration function is provided. The laser transceiver device includes an optical head spatial optical path, a transmitting optical fiber, a receiving optical fiber, and an optical amplifier. The optical head spatial optical path includes a transmitting mirror group, a receiving mirror group, and a position detector located between the transmitting mirror group and the receiving mirror group. The transmitting optical fiber and the receiving optical fiber are arranged between the optical head spatial optical path and the optical amplifier. The optical amplifier includes: a first optical amplifier component, which is configured to be connected to the transmitting mirror group via a transmitting optical fiber at the output end; a second optical amplifier component, which is configured to be connected to the receiving mirror group via a receiving optical fiber at the input end; a calibration light supply device, which is arranged inside the optical amplifier and is configured to be associated with the first optical amplifier component to use the output end of the first optical amplifier component to transmit calibration light to the transmitting optical fiber; and an optical power detector, which is arranged inside the optical amplifier and is connected to the second optical amplifier component and is configured to at least detect the power of the calibration light passing through the optical head spatial optical path. The calibration light is provided to the position detector via the transmitting lens group to perform the first measurement of the optical axis self-calibration, and is provided to the optical power detector after passing through the receiving lens group to perform the second measurement of the optical axis self-calibration.

[0008] In some embodiments, the first optical amplifier component is used as a calibration light supply device, the calibration light includes an emission signal light output from the output end of the first optical amplifier component; and the optical head spatial optical path also includes an attenuation device, which is configured to attenuate the calibration light to adjust the power of the calibration light.

[0009] In some embodiments, the spatial optical path of the optical head also includes: an adjustable lead galvanometer located downstream of the emitting mirror group; a tracking mirror group located downstream of the lead galvanometer; a dichroic mirror located downstream of the lead galvanometer and upstream of the tracking mirror group; and a light reflector located downstream of the dichroic mirror; wherein the dichroic mirror is configured to emit a first portion of the emission signal light from the lead galvanometer as signal light, and output a second portion of the emission signal light from the lead galvanometer to the light reflector and receive laser light returned from the light reflector and use it as calibration light, and wherein the attenuation device is arranged between the dichroic mirror and the light reflector.

[0010] In some embodiments, the calibration light supply device is arranged in parallel with the first optical amplifier component and connected to the output end of the first optical amplifier component, the calibration light supply device includes a calibration laser juxtaposed with the first optical amplifier component, and the first optical amplifier component includes a beam combining device located at its output end, wherein the calibration light from the calibration laser is provided to the transmitting optical fiber via the beam combining device.

[0011] In some embodiments, the beam combining device includes a first coupler located at the output end of the first optical amplifier assembly, or a first dense wavelength division multiplexing (DWDM) filter located at the output end of the first optical amplifier assembly. In this embodiment, the first coupler should be changed from a 1*2 coupler to a 2*2 coupler.

[0012] In some embodiments, the spatial optical path of the optical head also includes an attenuation device, which is configured to attenuate the calibration light output by the calibration laser to adjust the power of the calibration light; or the calibration laser includes a laser power regulator, which is configured to adjust the output power of the calibration laser to adjust the power of the calibration light.

[0013] In some embodiments, the second optical amplifier assembly further includes a light splitting device located at an input end thereof, wherein the calibration light from the receiving optical fiber is provided to the optical power detector via the light splitting device.

[0014] In some embodiments, the optical splitting device includes a second coupler located at the input end of the second optical amplifier component, the optical power detector includes a first input end optical power detector located at the input end of the second optical amplifier component, and the calibration light is provided to the first input end optical power detector via the second coupler.

[0015] In some embodiments, the optical splitting device includes a second DWDM filter located at the input end of the second optical amplifier component, the optical power detector includes a second additional optical power detector that is different from the first input end optical power detector at the input end of the second optical amplifier component, and the calibration light is provided to the second additional optical power detector via the second DWDM filter, and the output end of the second DWDM filter is connected to the second additional optical power detector via an optical fiber.

[0016] In some embodiments, the optical amplifier comprises an erbium doped fiber amplifier (EDFA).

[0017] In some embodiments, the laser transceiver device also includes a calibration controller communicatively connected to the optical amplifier, the lead galvanometer, and the position detector, and the calibration controller is configured to: receive first data of a first measurement from the position detector; receive second data of a second measurement from the optical power detector; and determine a result of optical axis self-calibration based on the first data and the second data.

[0018] According to a second aspect of the present invention, a method for self-calibrating the optical axis of a laser transceiver according to the first aspect is provided, wherein the optical head spatial optical path further includes an adjustable lead galvanometer located downstream of the transmitting mirror group and a tracking mirror group located downstream of the lead galvanometer. The laser transceiver further includes a calibration controller communicatively connected to the optical amplifier, the lead galvanometer, and the position detector. The method includes: using the calibration controller to adjust the position of the lead galvanometer to an initial position; using the calibration controller to cause the lead galvanometer to scan around the initial position; using the calibration controller to obtain first data regarding a first measurement from the position detector and second data regarding a second measurement from the optical power detector; and using the calibration controller to select power target data from the second data, and using the state value of the lead galvanometer corresponding to the power target data as the target calibration value of the lead galvanometer, and using the data corresponding to the power target data in the first data as the tracking position target value of the position detector.

[0019] In some embodiments, the calibration light includes a transmission signal light output from an output end of the first optical amplifier component, and the method further includes: using a calibration controller to adjust the output power of the first optical amplifier component to a predetermined value.

[0020] In some embodiments, the calibration light includes calibration light output from a calibration laser in parallel with the first optical amplifier assembly, and the method further includes: using a calibration controller to turn off the first optical amplifier assembly and adjust the output power of the calibration laser to a predetermined value.

[0021] According to a third aspect of the present invention, there is provided a machine-readable storage medium having machine-executable instructions stored thereon, wherein the machine-executable instructions are executed by a processor to implement the steps of the method according to the second aspect.

[0022] The beneficial effects of the present invention are as follows: in the laser transceiver device according to the present invention, calibration is performed with the help of existing devices in the optical amplifier (for example, EDFA) commonly used in laser communication in conjunction with the optical head spatial optical path. This solution directly multiplexes the transmitting optical fiber and the receiving optical fiber. Therefore, the calibration process of this solution does not require laboratory calibration, and the calibration results are not affected by the environment, and the calibration effect is stable after being on track. Moreover, since the existing components in the optical amplifier (for example, EDFA) are directly multiplexed, there will be no additional cost increase or the cost change is extremely low, and there will be no interference with the original function of the laser communication terminal. When the calibration fails, it will not have any impact on the function of the laser communication terminal itself, thereby ensuring the reliability of the laser communication terminal. Therefore, the optical fiber optical path of the optical amplifier (for example, EDFA) is combined with the optical head spatial optical path to realize the calibration function without affecting the original function of the laser communication terminal, and the cost does not change or changes very little, and the implementation is simple.

[0023] It should be understood that the contents described in the summary of the invention are not intended to limit the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and other features, advantages and aspects of the embodiments of the present invention will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, wherein:

[0025] Figure 1A A schematic structural diagram of a laser transceiver device according to some embodiments of the present invention is shown;

[0026] Figure 1B A schematic structural diagram of a laser transceiver device according to some embodiments of the present invention is shown;

[0027] Figure 2 A flow chart of a method for performing optical axis self-calibration on a laser transceiver device according to some embodiments of the present invention is shown;

[0028] Figure 3 Some embodiments of the present invention are shown for Figure 1A Flowchart of a method for performing optical axis self-calibration of a laser transceiver device shown;

[0029] Figure 4 Some embodiments of the present invention are shown for Figure 1B A flow chart of a method for performing optical axis self-calibration on a laser transceiver device is shown; and

[0030] Figure 5 A schematic block diagram of an example device implementing some embodiments of the present invention is shown. DETAILED DESCRIPTION

[0031] Various embodiments will now be described with reference to the accompanying drawings, wherein like reference numerals are used to refer to like elements throughout the text. In the following description, for the purpose of explanation, many specific details are set forth to facilitate a thorough understanding of one or more embodiments. However, it may be clear in some or all cases that any of the embodiments described below can be practiced without adopting the specific design details described below. In other examples, well-known structures and devices are shown in block diagram form to facilitate description of one or more embodiments. A simplified overview of one or more embodiments is given below to provide a basic understanding of the embodiments. This overview is not an exhaustive overview of all contemplated embodiments and is not intended to identify the key or important elements of all embodiments, nor is it intended to define the scope of any or all embodiments.

[0032] References to "an embodiment" or "one embodiment" in the context of this description are intended to indicate that a particular configuration, structure, or characteristic described with respect to the embodiment is included in at least one embodiment. Therefore, phrases such as "in an embodiment" or "in one embodiment" that may appear in one or more points of this description are not necessarily referring to the same embodiment. Furthermore, in one or more embodiments, the particular configurations, structures, or characteristics may be combined in any appropriate manner.

[0033] Unless otherwise indicated, when two elements are referred to as being connected together, this means a direct connection without any intermediate elements other than conductors; and when two elements are referred to as being coupled together, this means the two elements may be connected or they may be coupled via one or more other elements.

[0034] In the following disclosure, unless otherwise indicated, when absolute position modifiers (such as the terms "front," "back," "top," "bottom," "left," "right," etc.) or relative position modifiers (such as the terms "above," "below," "higher," "lower," etc.) are mentioned, or when directional modifiers (such as "horizontal," "vertical," etc.) are mentioned, reference is made to the orientation shown in the figures. Unless otherwise specified, the expressions "about," "approximately," "substantially," and "approximately" mean within 10%, preferably within 5%.

[0035] In the following description, one or more specific details are provided to provide a deeper understanding of the examples of the embodiments of the present description. The embodiments may be obtained without one or more of the specific details, or with other methods, components, materials, etc. In other cases, well-known structures, materials, or operations are not shown or described in detail so as not to obscure certain aspects of the embodiments.

[0036] Throughout the accompanying drawings, the same components or elements are indicated by the same reference numerals, and for the sake of brevity, the corresponding descriptions will not be repeated. The reference numerals used herein are provided for convenience only and do not therefore define the degree of protection or the scope of the embodiments.

[0037] As mentioned above, since the optical axis of a laser intersatellite link terminal is coaxially calibrated on a ground-based optical status platform, it can change after entering orbit due to influences such as atmospheric pressure, temperature, atmospheric turbulence, and lead angle, resulting in axial deviation. For example, due to the effects of rocket launch propulsion vibrations and gravitational release during satellite launch, the optical axes of the transmitting, receiving, and tracking optical paths of a space laser communication terminal, originally calibrated on the ground, will experience a certain amount of deviation during in-orbit operation. However, in such ultra-long-distance space communications, even extremely small deviations in the calibration of the transmitting and receiving beams are magnified over distance, severely impacting the efficiency and stability of the optical link, thereby increasing the difficulty of establishing optical communication links between satellites. In other words, in actual use, laser communication terminals are subject to environmental factors such as force, heat, and shock, leading to separation of the receiving and transmitting optical axes and deviation of the tracking point. Therefore, the optical axis of the laser communication terminal needs to be calibrated. For example, the optical axis of the receiving mirror assembly needs to be aligned with the optical axis of the transmitting mirror assembly, and the optical axes of the receiving and transmitting mirror assemblies need to be aligned with the optical axis of the tracking mirror assembly.

[0038] Traditional solutions typically add an additional optical path, assuming that the added optical path maintains its relative relationship to the original communication path. Changes in the optical axis are identified by monitoring the changes in the added optical path. However, this approach requires calibrating the relationship between the communication and calibration optical paths in the laboratory, as well as repeating the calibration in a vacuum tank. The calibration process is complex and cannot guarantee that the relative relationship will not change while in orbit. This approach requires beacon light for calibration, making debugging difficult and time-consuming. These methods cannot be performed simultaneously with the communication light during the calibration process, making it impossible to quickly, accurately, and in real time measure and calibrate the off-axis value in orbit.

[0039] In addition, some existing on-orbit calibrations usually require the introduction of many additional components and devices to complete the optical axis calibration function, which increases the calibration cost of the laser communication terminal, complicates the equipment control function, and may interfere with the original function of the laser communication terminal, thereby reducing the reliability of the laser communication terminal.

[0040] In view of the above problems, some embodiments of the present invention provide a laser transceiver device with an optical axis self-calibration function. The laser transceiver device includes: an optical head spatial optical path and an optical amplifier, wherein the optical head spatial optical path includes a transmitting mirror group, a receiving mirror group, an adjustable lead galvanometer mirror located downstream of the transmitting mirror group, a tracking mirror group located downstream of the lead galvanometer mirror, and a position detector located downstream of the tracking mirror group. The optical amplifier includes: a first optical amplifier component configured to be connected to the transmitting mirror group via a transmitting optical fiber; a second optical amplifier component configured to be connected to the receiving mirror group via a receiving optical fiber; a calibration light supply device configured to be associated with the first optical amplifier component to provide calibration light; and an optical power detector connected to the second optical amplifier component and configured to at least detect the power of the calibration light. When the lead galvanometer mirror is adjusted for scanning, the calibration light is provided to the transmitting mirror group and then provided to the position detector via at least the lead galvanometer mirror and the tracking mirror group to perform a first measurement for optical axis self-calibration, and the calibration light through the receiving mirror group is provided to the optical power detector to perform a second measurement for optical axis self-calibration. The laser transceiver device according to the present invention is calibrated with the help of existing devices in optical amplifiers commonly used in laser communications in conjunction with the spatial optical path of the optical head. It does not require laboratory calibration, does not require additional devices, and the calibration results are not affected by the environment.

[0041] The following describes in detail a laser transceiver device with an optical axis self-calibration function according to some embodiments of the present invention in conjunction with the accompanying drawings. Figure 1A A schematic structural diagram of a laser transceiver device with an optical axis self-calibration function according to some embodiments of the present invention is shown; Figure 1B FIG. 1 shows a schematic diagram of the structure of a laser transceiver device with an optical axis self-calibration function according to some embodiments of the present invention. Figure 1A and Figure 1B As shown, the thick curve represents the optical fiber connection, the straight line represents the optical path, the solid line with an arrow represents the optical path of the transmitted signal light, the dotted line with an arrow represents the optical path of the received signal light, and the dotted line with an arrow ( Figure 1B ) shows the optical path of the dedicated calibration light emitted by the calibration laser. That is, optical fiber connections are used in the optical amplifier, and optical fiber connections are also used between the optical amplifier and the optical head spatial optical path and the laser (not shown).

[0042] like Figure 1A and 1BAs shown, the laser transceiver 1000 with optical axis self-calibration includes an optical head spatial optical path 100A. This optical head spatial optical path 100A includes at least a transmitting mirror assembly 102, an angle-adjustable lead galvanometer mirror 103, a tracking mirror assembly 108, a position detector 109, and a receiving mirror assembly 110 along the laser optical path. Transmitting mirror assembly 102 has a transmitting optical axis, receiving mirror assembly 110 has a receiving optical axis, and tracking mirror assembly 108 has a tracking mirror assembly optical axis. Optical axis self-calibration requires that these three optical axes be aligned.

[0043] like Figure 1A and 1B As shown, the laser transceiver 1000 also includes an optical amplifier 100B. The optical amplifier 100B includes a calibration light supply device 101, a first optical amplifier component (e.g., a post-optical amplifier BA), a second optical amplifier component (e.g., a pre-optical amplifier PA), and an optical power detector 111. The calibration light supply device 101 is associated with, for example, the post-optical amplifier BA to provide calibration light using the existing post-optical amplifier BA, and the optical power detector 111 can be associated with, for example, the pre-optical amplifier PA to receive calibration light and signal light using the existing pre-optical amplifier PA. The post-optical amplifier BA is connected to the transmitting mirror assembly 102 at port BA-OUT via the existing transmitting optical fiber F1, and the pre-optical amplifier PA is connected to the receiving mirror assembly 110 at port PA-IN via the existing receiving optical fiber F2. In addition, the post-optical amplifier BA is connected to a transmitting laser (not shown) at port BA-IN via an optical fiber, and the pre-optical amplifier PA is connected to a signal processor (not shown) at port PA-OUT via an existing optical fiber.

[0044] In some embodiments, the optical amplifier 100B may be an erbium-doped fiber amplifier (EDFA), which can amplify optical signals in optical fiber communication systems, thereby enhancing the transmission distance and signal quality of the signals. EDFA makes long-distance, large-capacity, and high-speed optical fiber communications possible. The post-optical amplifier BA of the EDFA operates on the transmission side or the transmission side of the link and is placed behind the transmitter. The post-optical amplifier BA is used to boost the power of multiple wavelength signals before transmitting them. The pre-optical amplifier PA of the EDFA can operate at the receiving end of a dense wavelength division multiplexing (DWDM) link. The pre-optical amplifier PA is placed before the receiver end of the DWDM link. The pre-optical amplifier PA is used to compensate for the loss in the demultiplexer near the optical receiver, and to enhance the signal level before optical detection in ultra-long-distance systems, thereby improving the receiving sensitivity.

[0045] In some embodiments, as Figure 1A and 1BAs shown, the laser transceiver device can also include a calibration controller 100C, which can at least communicate with the optical amplifier 100B (for example, the calibration light supply device 101 and the optical power detector 111, etc.), the advance galvanometer 103 and the position detector 109, as shown by the dotted straight line in the figure.

[0046] In some embodiments, as Figure 1A As shown, the signal light or transmitted signal light from the post-optical amplifier BA can be directly used as calibration light, that is, the post-optical amplifier BA can realize the function of the calibration light supply device, and the calibration light includes the transmitted signal light directly output from the output end of the post-optical amplifier BA. Figure 1A As shown, the post-optical amplifier BA includes, for example, a BA gain device 114, etc. The gain device 114 can be used to transmit signal light as calibration light.

[0047] In some embodiments, as Figure 1B As shown, the calibration light supply device 101 may include a calibration laser 116. When the calibration laser 116 is working, the post optical amplifier BA may be turned off, so that the light from the calibration laser 116 is used as the calibration light. In other words, the signal light emitted by the post optical amplifier BA is not used as the calibration light, but the calibration light is provided by another calibration laser 116. However, the calibration laser 116 is associated with the post optical amplifier BA to transmit the calibration light by means of its existing optical fiber path. Figure 1B In the embodiment shown, since a calibration laser 116 is included, the output end of the post-optical amplifier BA further includes a beam combining device 113, which may include an output end coupler (in this case, the output end coupler should be changed from a 1*2 coupler to a 2*2 coupler) or a DWDM filter (not shown) located at the output end of the post-optical amplifier BA, thereby providing the calibration light to the transmitting optical fiber F1 via the output end coupler or the DWDM filter. Figure 1A As shown, the post-optical amplifier BA includes not only these couplers or filters, but also other devices, such as a BA gain device 114, etc. When the calibration laser 116 is working, these BA gain devices 114 can be turned off.

[0048] In some embodiments, as Figure 1A and 1BAs shown, calibration light from calibration light supply device 101 passes through at least transmitting fiber F1, transmitting mirror assembly 102, lead galvanometer mirror 103, and tracking mirror assembly 108 before being provided to position detector 109. Thus, detection at position detector 109 can detect when the optical axes of the transmitting mirror assembly and the tracking mirror assembly are aligned. As lead galvanometer mirror 103 is continuously adjusted to scan the calibration light, position detector 109 can detect the position information of the light spot, which serves as a measurement for optical axis self-calibration and is used to select tracking feature values.

[0049] For example, Figure 1A As shown, the optical head spatial optical path 100A also includes a dichroic mirror 104, a light reflector 105, an attenuation device 106, a spectroscope 107, and a tracking lens group 108 (e.g., a precision tracking lens group) along the optical path of the laser. The dichroic mirror 104 can split the transmitted signal light into two paths, one of which is emitted as signal light and the other is provided to the light reflector 105 and the attenuation device 106. The light returned from the light reflector 105 can then be used as calibration light and directed to the spectroscope 107. The dichroic mirror 104 can also receive received signal light from the outside world. The attenuation device 106 can adjust the power of the calibration light to suit the parameters of the position detector and the receiving optical fiber. The spectroscope 107 can split the calibration light into two paths, one of which is provided to the tracking lens group 108 (e.g., a precision tracking lens group) to reach the position detector and the other is provided to the receiving lens group 110.

[0050] For example, Figure 1A As shown, the calibration light from the calibration light supply device 101 is provided to the position detector 109 through the transmitting optical fiber F1, the transmitting mirror group 102, the leading galvanometer 103, the dichroic mirror 104, the light reflector 105, the attenuation device 106, the beam splitter 107, and the tracking mirror group 108 (e.g., the fine tracking mirror group) to perform the spot measurement. In addition, as Figure 1A As shown, the signal light received by the dichroic mirror 104 can be provided to the position detector 109 after passing through the beam splitter 107 and the tracking lens group 108 (for example, a precision tracking lens group), so that the light spot of the received signal light is also measured, and the received signal light can also be provided to the receiving lens group 110 to enter the optical amplifier.

[0051] like Figure 1B As shown, the optical head spatial optical path 100A further includes a dichroic mirror 104, a light reflector 105, an optional attenuation device 106 (the dotted line indicates that the device is omissible), a beam splitter 107 and a tracking lens group 108 (for example, a precision tracking lens group) along the optical path of the laser. Figure 1A Compared with the embodiment, Figure 1B The attenuation device 106 may be omitted in the embodiment, but the attenuation device 106 may also be included in Figure 1B In the embodiment of Figure 1B As shown, the calibration light from the calibration light supply device 101 (calibration laser 116) is provided to the position detector 109 through the transmitting optical fiber F1, the transmitting mirror group 102, the leading galvanometer 103, the dichroic mirror 104, the light reflector 105, the optional attenuation device 106, the beam splitter 107, and the tracking mirror group 108 (e.g., the fine tracking mirror group) for spot measurement. In addition, as Figure 1B As shown, the signal light received by the dichroic mirror 104 can be provided to the position detector 109 after passing through the beam splitter 107 and the tracking lens group 108 (for example, a precision tracking lens group), so that the light spot of the received signal light is also measured, and the received signal light can also be provided to the receiving lens group 110 to enter the optical amplifier.

[0052] like Figure 1A and 1B As shown, the optical amplifier 100B may also include an optical power detector 111. The calibration light passing through the receiving mirror assembly 110 is input to the optical power detector 111 via the receiving optical fiber F2 to detect the power of the calibration light, thereby performing a measurement for optical axis self-calibration. In addition, the received signal light passing through the receiving mirror assembly 110 is also input to the optical power detector 111 via the receiving optical fiber F2 to detect the power of the signal light, thereby performing a power measurement for optical axis self-calibration.

[0053] like Figure 1A and 1B As shown, before the calibration light is input into the optical power detector 111, the calibration light from the receiving optical fiber F2 needs to first pass through the optical splitter 112 at the input end of the pre-optical amplifier PA. The optical splitter 112 may include an input end coupler or a DWDM filter (not shown), thereby providing the calibration light to the optical power detector 111. As shown in the figure, in addition to these couplers or filters, the pre-optical amplifier PA also includes other devices, such as a PA gain device 115.

[0054] In the laser transceiver according to the present invention, the transmission signal light from the existing post-optical amplifier of the optical amplifier can be directly used as the calibration light. Alternatively, the calibration light can also be generated by the existing calibration laser 116 contained in the optical amplifier. In either case, the calibration light can be provided by the existing components of the optical amplifier. The calibration light can then be provided to the optical head spatial optical path through the existing transmitting optical fiber, and then provided to the position detector for spot measurement, etc. Using the existing receiving optical fiber, the calibration light and / or signal light from the optical head spatial optical path (the signal light is received by the dichroic mirror, for example, by the receiving optical path formed by the dichroic mirror, the beam splitter, the receiving mirror group, etc.) is provided to the optical amplifier. Then the input end coupler or DWDM filter (contained in the existing beam splitting device) of the existing pre-optical amplifier PA in the optical amplifier splits the calibration light, and then the calibration light is provided to the power detector for power measurement, etc.

[0055] Therefore, the calibration light propagates between the optical amplifier and the optical head using existing transmitting and receiving fibers. The corresponding target detected by this solution is always the target of the transmitting and receiving fibers. Since existing laser communication systems in optical amplifiers (e.g., EDFAs) already utilize input and output couplers or DWDM filters, and existing EDFAs for laser communication typically include optical power detectors, the present invention eliminates the need for additional components and can achieve optical axis self-calibration directly using existing components.

[0056] Therefore, the laser transceiver of the present invention is calibrated with the help of existing devices in the optical amplifier (for example, EDFA) commonly used in laser communication in conjunction with the optical head spatial optical path. This solution directly multiplexes the transmitting optical fiber and the receiving optical fiber. Therefore, the calibration process of this solution does not require laboratory calibration, and the calibration results are not affected by the environment, and the calibration effect is stable after being on track. Moreover, since the existing components in the optical amplifier (for example, EDFA) are directly multiplexed, it will not cause additional cost increases, nor will it interfere with the original functions of the laser communication terminal. When the calibration fails, it will not have any impact on the function of the laser communication terminal itself, thereby ensuring the reliability of the laser communication terminal. Therefore, the optical fiber optical path of the optical amplifier (for example, EDFA) is combined with the optical head spatial optical path to realize the calibration function without affecting the original function of the laser communication terminal, and the cost does not change or changes very little, and the implementation is simple.

[0057] In such Figure 1AIn the described embodiment, the laser transceiver device with the optical axis self-calibration function is composed of an optical amplifier (e.g., EDFA) fiber optic path, an optical head spatial optical path, and a calibration controller. The optical amplifier fiber optic path includes a post-optical amplifier (BA), a beam splitter (generally a DWDM filter or coupler, or an optical switch) and an optical power detector at the input end of the pre-optical amplifier (PA). The optical head spatial optical path is composed of a transmitting mirror group, a lead galvanometer, a dichroic mirror (DM), an attenuation device, an optical reflector, a beam splitter, a precision tracking mirror group, a position detector, and a receiving mirror group. The calibration controller is composed of a control board and control software, and the components of the optical head spatial optical path are connected through an optical path. The optical amplifier fiber optic path and the optical head spatial optical path are connected through an optical fiber. The BA of the optical amplifier is connected to the transmitting mirror group of the optical head spatial optical path through an optical fiber, and the PA of the optical amplifier is connected to the receiving mirror group of the optical head spatial optical path through an optical fiber. The calibration controller is connected to the optical amplifier and the lead galvanometer and position detector in the spatial optical path of the optical head through a circuit.

[0058] In such Figure 1A In the illustrated embodiment, the optical fiber optical path of the optical amplifier 100B (e.g., an EDFA) of the device consists of a post-optical amplifier BA, an input coupler or DWDM filter of the pre-optical amplifier PA, and an optical power detector. The device uses transmitted signal light as calibration light. The calibration light passes through the transmitting optical fiber F1 and enters the transmitting mirror assembly 102, where it is output to the leading galvanometer mirror 103. After being emitted by the leading galvanometer mirror 103, it is output to the dichroic mirror 104. The transmitted signal light is split into two paths by the dichroic mirror 104. One path is emitted as signal light, while the other path, as calibration light, passes through the dichroic mirror 104 and is output to the optical reflector 105. The optical reflector 105 is generally a pyramid, but can also be a reflector, grating, or the like. An attenuation device 106 can be provided between the dichroic mirror and the optical reflector to adjust the optical power of the calibration light within the position detector 109 and the receiving optical fiber F2. In some examples, the attenuation device 106 can be an attenuator, an aperture, or a filter.

[0059] After passing through the optical reflector 105, the calibration light returns to the dichroic mirror 104. At this time, the light beam output from the dichroic mirror 104 to the beam splitter 107 can be selected as the calibration light. The beam splitter 107 splits the calibration light into two new calibration lights. One of the calibration lights is output through the optical path to the tracking lens group 108 (for example, the fine tracking lens group) and then output to the position detector 109. The position detector 109 feedbacks the position information as the tracking characteristic value based on the received light spot. In addition, the other calibration light is coupled into the receiving optical fiber F2 through the receiving lens group 110 and then output to the input end of the pre-optical amplifier PA. After passing through the optical splitter device 112 provided at the input end of the pre-optical amplifier PA, the calibration light enters the optical power detector 111. The input part of the pre-optical amplifier PA (i.e., the optical splitter device) can include an input end coupler (not shown) or a DWDM filter (not shown).

[0060] In some embodiments, the input end coupler of the pre-amplifier PA is selected to guide the calibration light, and the input end coupler of the pre-amplifier PA needs to be placed before the input end DWDM filter, that is, the calibration light first passes through the input end coupler of the pre-amplifier PA and then passes through the DWDM filter. At this time, the original input end optical power detector of the pre-amplifier PA can be directly used as the optical power detector 111 for calibration.

[0061] In some embodiments, a DWDM filter can be selected at the input end of the pre-optical amplifier PA. The order of the input end coupler and the DWDM filter of the pre-optical amplifier PA does not affect the calibration function, but another output port of the DWDM filter needs to be connected to the optical power detector 111 through an optical fiber. The optical power detector 111 can be a newly added optical power detector, which is different from the original input end optical power detector of the pre-optical amplifier PA.

[0062] In such Figure 1BIn the described embodiment, the laser transceiver device with the optical axis self-calibration function is also composed of an optical amplifier (e.g., EDFA) fiber optic path, an optical head spatial optical path, and a calibration controller. The optical amplifier fiber optic path includes a beam combining device (generally a DWDM filter, or a coupler) at the output end of the post-optical amplifier (BA), a beam splitting device (generally a DWDM filter or a coupler, or an optical switch) and an optical power detector at the input end of the pre-optical amplifier (PA). The optical head spatial optical path is composed of a transmitting mirror group, a leading galvanometer, a dichroic mirror (DM), an optical reflector, a beam splitter, a precision tracking mirror group, a position detector, and a receiving mirror group. The calibration controller is composed of a control board and control software, and the components of the optical head spatial optical path are connected through an optical path. The optical amplifier fiber optic path and the optical head spatial optical path are connected through an optical fiber. The BA of the optical amplifier is connected to the transmitting mirror group of the optical head spatial optical path through an optical fiber at the output end, and the PA of the optical amplifier is connected to the receiving mirror group of the optical head spatial optical path through an optical fiber at the input end. The calibration controller and the optical amplifier as well as the leading galvanometer and the position detector in the spatial optical path of the optical head are connected through circuits.

[0063] In such Figure 1B In the laser transceiver device shown, the optical fiber optical path portion of the optical amplifier 100B (for example, EDFA) of the device consists of a calibration laser 116, a coupler or DWDM filter at the output end of the post-optical amplifier BA, a coupler or DWDM filter at the input end of the pre-optical amplifier PA, and an optical power detector. Figure 1B The configuration of the pre-optical amplifier PA part of the device is Figure 1A The devices shown are identical except that Figure 1B The device uses the output light of the independent calibration laser 116 as calibration light.

[0064] like Figure 1B As shown, the calibration laser 116 emits calibration light, which is then combined with the signal light into one beam through a coupler or DWDM filter at the output of the BA. Usually, the output of the BA has a DWDM filter to reduce the crosstalk between the transmitted signal light and the received signal light. However, there is an idle input port of the DWDM filter. Figure 1B The calibration laser 116 is connected to this port via an optical fiber, thereby combining the calibration light and the transmitted signal light into a single beam. Similarly, if an existing DWDM filter is not used, an output coupler can be used to achieve the same function, but using an existing DWDM filter is preferred. If the post-optical amplifier BA does not include a DWDM filter under special circumstances, a DWDM filter or coupler can be added to achieve the same function.

[0065] The calibration light passes through the transmitting optical fiber F1 and enters the transmitting mirror assembly 102, where it is output to the leading galvanometer mirror 103. After being transmitted by the leading galvanometer mirror 103, it is output to the dichroic mirror 104. The dichroic mirror 104 outputs the calibration light to the optical retroreflector 105. The optical retroreflector 105 is generally a pyramid, but can also be a reflector, grating, etc. Figure 1B The laser transceiver can optionally add an attenuation device 106 between the dichroic mirror 104 and the light reflector 105 to adjust the optical power of the calibration light in the position detector and the receiving optical fiber. In some examples, the attenuation device can be an attenuation plate, an aperture, or a filter. Figure 1B The laser transceiver device can also choose to adjust the optical power of the calibration light in the position detector 109 and the receiving optical fiber F2 by adjusting the output power of the calibration laser 116 without adding other components between the dichroic mirror and the light reflector.

[0066] After passing through the optical reflector 105, the calibration light returns to the dichroic mirror 104. At this time, the light beam output from the dichroic mirror 104 to the beam splitter 107 serves as the calibration light. The beam splitter 107 splits the calibration light into two new calibration lights. One path is output through the optical path to the tracking lens assembly 108 (for example, the fine tracking lens assembly) and then output to the position detector 109. The position detector 109 feedbacks the position information based on the received light spot as the tracking characteristic value. The other path of calibration light is coupled into the receiving optical fiber F2 through the receiving lens assembly 110 and output to the input end of the pre-amplifier PA. After passing through the optical splitter 112, the calibration light enters the optical power detector 111. Typically, the input part of the PA (i.e., the optical splitter) includes both an input coupler and a DWDM filter.

[0067] In some embodiments, the input end coupler of the pre-optical amplifier PA is selected to guide the calibration light, and the input end coupler of the pre-optical amplifier PA needs to be placed before the input end DWDM filter, that is, the calibration light first passes through the input end coupler of the pre-optical amplifier PA and then passes through the DWDM filter. At this time, the original input end optical power detector of the pre-optical amplifier PA can be directly used as the optical power detector for calibration.

[0068] In some embodiments, a DWDM filter is selected at the input end of the pre-optical amplifier PA. The order of the input end coupler and the DWDM filter of the pre-optical amplifier PA does not affect the calibration function, but another output port of the DWDM needs to be connected to the optical power detector 111 through an optical fiber. The optical power detector 111 can be a newly added optical power detector, which is different from the original input end optical power detector of the pre-optical amplifier PA.

[0069] Figure 2 A flow chart of a method 200 for performing optical axis self-calibration on a laser transceiver device according to an embodiment of the present invention is shown.

[0070] like Figure 2 As shown, in step 210, a calibration controller is used to adjust the position of the lead galvanometer to an initial position. This initial position can be a laboratory calibration value of the laser transceiver when it is factory-set. In a laboratory environment, at this initial position, the optical axes of the transmitting mirror assembly, the receiving mirror assembly, and the tracking mirror assembly are aligned with each other.

[0071] In step 220, a calibration controller is used to cause the leading galvanometer to scan around an initial position. In other words, the angle of the leading galvanometer changes, and this change occurs around the initial position. In step 230, the calibration controller is used to obtain first data regarding a first measurement from the position detector and second data regarding a second measurement from the optical power detector. For example, during the scanning process, the calibration controller can record the camera spot centroid reading of the position detector 109 and the power reading of the optical power detector 111 at each scanning point.

[0072] In step 240, a calibration controller is used to select power target data from the second data, and the state value of the leading galvanometer mirror corresponding to the power target data is used as the target calibration value of the leading galvanometer mirror. The data corresponding to the power target data in the first data is used as the tracking position target value of the position detector. The data regarding the first measurement includes characteristic values of the position detector and the state value (angle) of the leading galvanometer mirror. The second data regarding the second measurement includes the value of the optical power detector. The target value of the leading galvanometer mirror is the state value corresponding to the power target data of the leading galvanometer mirror (this is used to calibrate the coaxiality of the transmitting and receiving light). The specific first data associated with the power target data is the tracking position target value of the position detector (this is used to calibrate the pointing position of the receiving and tracking light axis). This tracking position target value may also be referred to as a tracking point, tracking point, or tracking position characteristic value. For example, after completing a scan of a predetermined range, the calibration controller compares all optical power detector readings, selects the set of data with the highest corresponding power among the optical power detector readings, and records the corresponding result of the highest power value of the optical power detector. These corresponding results can be used as the calibration setting of the leading galvanometer mirror and the calibration characteristic value of the position detector (e.g., the position or energy ratio of the light spot).

[0073] When the calibration light is provided by a post-optical amplifier, in addition to adjusting the position of the lead galvanometer to its initial position, the output power of the post-optical amplifier must also be adjusted to an appropriate level so that the calibration light power is suitable for the subsequent position detector and receiving fiber. When the calibration light is provided by a calibration light laser, in addition to adjusting the position of the lead galvanometer to its initial position, the output power of the calibration light laser must also be adjusted to an appropriate level so that the calibration light power is suitable for the subsequent position detector and receiving fiber.

[0074] Figure 3 Shown is a Figure 1A The illustrated embodiment is a flow chart of a method 300 for performing optical axis self-calibration of a laser transceiver.

[0075] After the calibration process begins, in step 310, the calibration controller sets the output power of the EDFA's post-optical amplifier (BA) and the position of the lead galvanometer to predetermined values. These predetermined values may be initial values obtained during laboratory calibration. Under these initial values, the optical axes of the transmitting and receiving mirrors are aligned, and each is aligned with the optical axis of the tracking mirrors. However, these optical axes may become misaligned due to influences such as heat and force while in orbit.

[0076] During the calibration process, in step 320 , the calibration controller 100C controls the leading galvanometer 103 to scan near a predetermined value and records the camera spot centroid reading of the position detector 109 and the reading of the optical power detector 111 at each scanning point.

[0077] After completing the scan within the predetermined range, in step 330, the calibration controller 100C compares all readings from the optical power detector 111 and selects the set of data with the highest corresponding readings. In step 340, the corresponding result of the detector's highest power value is recorded as the corresponding setting for the lead galvanometer 103 and the characteristic value for the position detector 109. In step 350, the calibration controller 100C sets the corresponding setting for the lead galvanometer to the lead galvanometer default setting and sets the characteristic value for the position detector to the tracking point, tracking point, or tracking position characteristic value. This completes the optical axis self-calibration.

[0078] Figure 4 Shown is a Figure 1B The illustrated embodiment is a flow chart of a method 400 for performing optical axis self-calibration of a laser transceiver device.

[0079] After the calibration process begins, in step 420, the calibration controller 100C controls the post-optical amplifier BA to turn off and sets the calibration laser 116 and the lead galvanometer 103 to predetermined values. In step 420, the calibration controller 100C controls the lead galvanometer 103 to scan around the predetermined value and records the camera spot centroid reading and the optical power detector reading at each scan point.

[0080] In step 430, after completing the scan of the predetermined range, the calibration controller 100C compares all detector readings and selects the set of data with the highest corresponding power. In step 440, the result corresponding to the highest detector power value is recorded as the corresponding setting for the lead galvanometer and the position detector characteristic value. In step 450, the calibration controller 100C sets the corresponding setting for the lead galvanometer to the default setting for the lead galvanometer and sets the characteristic value for the position detector to the tracking point, tracking point, or tracking position characteristic value. This completes the optical axis self-calibration.

[0081] Figure 5 1 shows a schematic block diagram of an example device 500 that can be used to implement an embodiment of the present invention. The example device 500 can be as follows: Figure 1A and 1B 100C. As shown in the figure, the device 500 includes a computing unit 501, which can perform various appropriate actions and processes according to computer program instructions stored in a read-only memory (ROM) 502 or loaded from a storage unit 508 into a random access memory (RAM) 503. Various programs and data required for the operation of the device 500 can also be stored in the RAM 503. The computing unit 501, ROM 502, and RAM 503 are connected to each other via a bus 504. An input / output (I / O) interface 505 is also connected to the bus 504.

[0082] Various components in the device 500 are connected to the I / O interface 505, which may include, for example: an input unit 506, such as a keyboard, a mouse, etc.; an output unit 507, such as various types of displays, speakers, etc.; a storage unit 508, such as a magnetic disk, an optical disk, etc.; and a communication unit 509, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 509 allows the device 500 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0083] The computing unit 501 may be a variety of general-purpose and / or specialized processing components with processing and computing capabilities. Some examples of the computing unit 501 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units that run machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The computing unit 501 performs the various methods and processes described above, such as methods 200 to 400. For example, in some embodiments, methods 200 to 400 may be implemented as a computer software program that is tangibly contained in a machine-readable medium, such as a storage unit 508. In some embodiments, part or all of the computer program may be loaded and / or installed on the device 500 via the ROM 502 and / or the communication unit 509. When the computer program is loaded into the RAM 503 and executed by the computing unit 501, one or more steps of the methods 200 to 400 described above may be performed. Alternatively, in other embodiments, the computing unit 501 may be configured to execute methods 200 to 400 in any other appropriate manner (eg, by means of firmware).

[0084] The functions described above herein may be performed, at least in part, by one or more hardware logic components. For example, and without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), and the like.

[0085] The program code for implementing the method of the present invention can be written in any combination of one or more programming languages. Such program code can be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device so that when the program code is executed by the processor or controller, the functions / operations specified in the flow chart and / or block diagram are implemented. The program code can be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0086] In the context of the present invention, a machine-readable medium can be a tangible medium that can contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or equipment, or any suitable combination of the foregoing. More specific examples of machine-readable storage media can include an electrical connection based on one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In addition, although each operation is depicted in a specific order, this should be understood as requiring that such operations be performed in the specific order shown or in a sequential order, or requiring that all illustrated operations be performed to obtain the desired result. In certain environments, multitasking and parallel processing may be advantageous. Likewise, although several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the present invention. Certain features described in the context of separate embodiments may also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation may also be implemented in multiple implementations individually or in any suitable subcombination.

[0087] Although the subject matter has been described in language specific to structural features and / or methodological logical acts, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are merely example forms of implementing the claims.

Claims

1. A laser transceiver with an optical axis self-calibration function, characterized in that: include: The optical head spatial light path includes a transmitting mirror group, a receiving mirror group, and a position detector located between the transmitting mirror group and the receiving mirror group; The transmitting optical fiber and the receiving optical fiber are arranged between the optical path of the optical head and the optical amplifier; as well as The optical amplifier comprises: a first optical amplifier assembly configured to be connected to the transmitting mirror assembly via the transmitting optical fiber at an output end; a second optical amplifier assembly configured to be connected to the receiving mirror assembly via the receiving optical fiber at an input end; a calibration light supply device, disposed inside the optical amplifier and configured to be associated with the first optical amplifier component to transmit calibration light to the transmitting optical fiber using the output end of the first optical amplifier component; and an optical power detector, disposed inside the optical amplifier and connected to the second optical amplifier assembly and configured to at least detect the power of the calibration light passing through the spatial optical path of the optical head; and The calibration light is provided to the position detector via the transmitting mirror group to perform a first measurement of the optical axis self-calibration, and is provided to the optical power detector after passing through the receiving mirror group to perform a second measurement of the optical axis self-calibration.

2. The laser transceiver according to claim 1, wherein: The first optical amplifier component is used as the calibration light supplying device, and the calibration light includes the transmission signal light output from the output end of the first optical amplifier component; and The optical head spatial light path further includes an attenuation device, which is configured to attenuate the calibration light to adjust the power of the calibration light.

3. The laser transceiver according to claim 2, characterized in that: The optical head spatial light path also includes: an adjustable lead galvanometer located downstream of the transmitting mirror assembly; a tracking mirror assembly located downstream of the leading galvanometer mirror; a dichroic mirror located downstream of the lead galvanometer and upstream of the tracking mirror assembly; and a light retroreflector located downstream of the dichroic mirror; wherein the dichroic mirror is configured to emit a first portion of the emission signal light from the lead galvanometer as signal light, and output a second portion of the emission signal light from the lead galvanometer to the light reflector and receive laser light returned from the light reflector as the calibration light, and The attenuation device is arranged between the dichroic mirror and the light retroreflector.

4. The laser transceiver according to claim 1, wherein: The calibration light supply device is arranged in parallel with the first optical amplifier component and connected to the output end of the first optical amplifier component, and the calibration light supply device includes a calibration laser juxtaposed with the first optical amplifier component, and The first optical amplifier assembly includes a beam combining device located at the output end, wherein the calibration light from the calibration laser is provided to the transmitting optical fiber via the beam combining device.

5. The laser transceiver according to claim 4, characterized in that: The beam combining device comprises: a first coupler at the output of the first optical amplifier assembly, or The first optical amplifier assembly includes a first dense wavelength division multiplexing filter located at the output end.

6. The laser transceiver according to claim 4, characterized in that: The optical head spatial light path further includes an attenuation device, wherein the attenuation device is configured to attenuate the calibration light output by the calibration laser to adjust the power of the calibration light; or The calibration laser includes a laser power regulator configured to adjust the output power of the calibration laser to adjust the power of the calibration light.

7. The laser transceiver according to claim 1, characterized in that: The second optical amplifier assembly further comprises a light splitting device located at the input end, The calibration light from the receiving optical fiber is provided to the optical power detector via the optical splitting device.

8. The laser transceiver according to claim 7, characterized in that: The optical splitting device comprises a second coupler located at the input end of the second optical amplifier assembly, The optical power detector includes a first input end optical power detector located at the input end of the second optical amplifier component, and The calibration light is provided to the first input-end optical power detector via the second coupler.

9. The laser transceiver according to claim 7, characterized in that: The optical splitting device includes a second dense wavelength division multiplexing filter located at the input end of the second optical amplifier assembly, The optical power detector includes a second additional optical power detector that is different from the input end optical power detector located at the input end of the second optical amplifier assembly, and The calibration light is provided to the second additional optical power detector via the second dense wavelength division multiplexing filter, and an output end of the second dense wavelength division multiplexing filter is connected to the second additional optical power detector via an optical fiber.

10. The laser transceiver according to any one of claims 1 to 9, characterized in that: The optical amplifier includes an erbium-doped fiber amplifier.

11. The laser transceiver according to claim 3, further comprising a calibration controller communicably connected to the optical amplifier, the lead galvanometer, and the position detector. The calibration controller is configured to: receiving first data of the first measurement from the position detector; receiving second data of the second measurement from the optical power detector; and A result of the optical axis self-calibration is determined based on the first data and the second data.

12. A method for performing optical axis self-calibration on the laser transceiver according to claim 1, wherein the optical head spatial optical path further includes an adjustable lead galvanometer located downstream of the transmitting mirror group and a tracking mirror group located downstream of the lead galvanometer. The laser transceiver further includes a calibration controller communicatively connected to the optical amplifier, the lead galvanometer, and the position detector. The method comprises: Adjusting the position of the leading galvanometer to an initial position via the calibration controller; The leading galvanometer scans around the initial position; Acquire first data regarding the first measurement from the position detector and second data regarding the second measurement from the optical power detector; as well as Power target data is selected from the second data, and the state value of the leading galvanometer corresponding to the power target data is used as the target calibration value of the leading galvanometer, and the data corresponding to the power target data in the first data is used as the tracking position target value of the position detector.

13. The method according to claim 12, characterized in that The calibration light includes a transmission signal light output from an output end of the first optical amplifier component, and the method further includes: The calibration controller is used to adjust the output power of the first optical amplifier component to a predetermined value.

14. The method according to claim 12, characterized in that The calibration light includes calibration light output from a calibration laser connected in parallel with the first optical amplifier assembly, and the method further includes: Using the calibration controller, the first optical amplifier component is turned off and the output power of the calibration laser is adjusted to a predetermined value.

15. A machine-readable storage medium having machine-executable instructions stored thereon, wherein the machine-executable instructions are executed by a processor to implement the steps of the method according to any one of claims 12 to 14.

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