An underwater coaxial dual-light-source transmitting device and a double-end high-speed optical communication method

Abstract

The application provides a kind of underwater coaxial double light source emitting device and double-end high-speed optical communication method, it relates to space optical communication field, emitting device includes signal source, light source module, control switch and optical antenna;Wherein, light source module includes the first light source unit as communication light source and the second light source unit as beacon light source, the optical axis of first light source unit and second light source unit is parallel;The light source center point of first light source unit coincides with the light source center point of second light source unit, and the second light source unit includes multiple second light sources, and multiple second light sources are arranged in central symmetry around the light source center point of first light source unit.This application solves the problem that beacon light can not be considered in a wide range of capture and high-speed information transmission of communication light in special application scenarios such as underwater.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of space optical communication, in particular to a coaxial dual light source emitting device and a dual-end high-speed optical communication method. BACKGROUND

[0002] In recent years, with the development of technology, space optical communication technology has become an irreplaceable wireless communication technology, especially in the field of underwater optical communication.

[0003] Due to the limited available communication light bands in special scenarios such as underwater, the communication light source used in space optical communication is often the same band light source, which serves as both beacon light and communication light. However, in practical applications, the communication light needs to be modulated at high speed, which will cause the emission power to decrease. Therefore, in order to ensure the signal-to-noise ratio, the divergence angle needs to be compressed to reduce spatial loss.

[0004] However, in order to ensure the capture and alignment efficiency, the beacon light often needs a large divergence angle, which makes it impossible to simultaneously consider both wide-range capture and high-rate information transmission, thereby seriously affecting the application effect of space optical communication systems in special scenarios such as underwater. SUMMARY

[0005] The present application provides a coaxial dual light source emitting device and a dual-end high-speed optical communication method, which solves the problem that the wide-range capture of beacon light and the high-rate information transmission of communication light cannot be considered simultaneously in special application scenarios such as underwater.

[0006] In one aspect, the present application provides a coaxial dual light source emitting device, which comprises, in order along the optical path direction:

[0007] a signal source for signal modulation of the first light source unit;

[0008] a light source module comprising a first light source unit as a communication light source and a second light source unit as a beacon light source, the optical axes of the first light source unit and the second light source unit being parallel; the light source center point of the first light source unit coincides with the light source center point of the second light source unit, the second light source unit comprising a plurality of second light sources arranged in central symmetry around the light source center point of the first light source unit;

[0009] a control switch for controlling the switching of the first light source unit and the second light source unit;

[0010] an optical antenna for emitting the first light source unit and the second light source unit with parallel optical axes in the same direction after beam combination.

[0011] Further, the first light source has a first power and a first emission angle for transmitting and tracking high-speed signals; the second light source has a second power and a second emission angle for spot coverage and illumination; wherein the first power is less than the second power, and the difference is at least one order of magnitude; the first emission angle is less than the second emission angle, and the difference is at least ten times.

[0012] Further, the first light source unit includes one or more first light sources;

[0013] When the first light source is one, the light source center point of the first light source coincides with the center point of the light source module;

[0014] When the first light source is multiple, the multiple first light sources are arranged in central symmetry around the center point of the light source module.

[0015] Further, the first light source is an LD light source, and the second light source is an LED light source.

[0016] Further, the beacon light source adopts a multi-ring light source distribution, taking the communication light source as the center, and arranging a plurality of layers of central symmetric ring arrays composed of second light sources.

[0017] Further, the control switch includes two sub-switches, one sub-switch corresponding to connecting the first light source unit, and the other sub-switch corresponding to connecting the second light source unit.

[0018] Further, the control switch controls the switching of the first light source and the second light source, including: in the scanning and capturing stage, turning on the second light source; after completing the scanning and capturing stage, entering the tracking and communication stage, turning on the first light source while turning off the second light source.

[0019] Further, the control switch includes but is not limited to a circuit switch, a linear polarizer, and a mechanical switch.

[0020] On the other hand, the application provides an underwater double-end high-speed optical communication method, which utilizes the above-mentioned any one of the transmitting devices for spatial optical communication.

[0021] Further, the method includes:

[0022] Simultaneously turning on the first transmitting device and the second transmitting device, and obtaining first beacon light spot signals and second beacon light spot signals;

[0023] Rotating the first transmitting device and the second transmitting device to scan and align with each other, so that the optical axes of the first beacon light spot signals and the second beacon light spot signals coincide with each other;

[0024] The first light source unit of the first transmitting device and the second transmitting device is opened at the same time, the first communication light spot signal and the second communication light spot signal are obtained, and it is ensured that the first communication light spot signal transmitted by the first transmitting device covers the receiving end of the second transmitting device;

[0025] The second light source unit of the first transmitting device and the second transmitting device is closed at the same time, real-time tracking is performed according to the first communication light spot signal and the second communication light spot signal, and the link is kept stable;

[0026] The first light source unit is subjected to signal debugging, high-speed signal light is generated, and underwater double-end high-speed optical communication is realized.

[0027] Overall, the application provides a transmitting device of underwater coaxial double light sources and a double-end high-speed optical communication method, and the following beneficial effects can be achieved compared with the prior art by the technical scheme conceived by the application:

[0028] The application sets the light source module as coaxial double light sources by using the first light source unit with high speed and small divergence angle and the second light source unit with large power and large divergence angle, forms a transmitting light spot with the same geometric center through the central symmetric spatial layout, so that the first light source unit and the second light source unit can be emitted in the same direction with different divergence angles and emission powers; the large-range capture and high-speed information transmission can be considered at the same time, the beacon light and the communication light are integrated underwater, and the spatial optical communication system in special scenes such as underwater has important significance.

[0029] In addition, the light source switching is performed on different stages of underwater optical communication by using the control switch, the capture beacon light and the high-speed communication light are time-multiplexed; not only the high-speed communication capability of the first light source unit with high speed and small divergence angle can be fully utilized to realize accurate tracking and high-speed communication, but also the second light source unit with large power and large divergence angle can be fully utilized to realize rapid scanning and capture, so that the large-range capture and high-speed information transmission can be considered at the same time, and the implementation difficulty of the underwater blue-green light spatial optical communication system is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical schemes in the application or the prior art, the drawings needed to be used in the following embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0031] Figure 1 It is a device principle schematic diagram of a transmitting device of underwater coaxial double light sources provided by the application;

[0032] Figure 2Figure 1 is a schematic diagram of a light source module of a transmitting device of a coaxial dual light source underwater emitting device provided by the present application Figure 1 ;

[0033] Figure 3 Figure 1 is a schematic diagram of a light source module of a transmitting device of a coaxial dual light source underwater emitting device provided by the present application Figure 2 ;

[0034] Figure 4 Figure 2 is a schematic diagram of light source space transmission of a coaxial dual light source underwater emitting device provided by the present application

[0035] Figure 5 Figure 3 is a schematic diagram of a method principle of a coaxial dual light source underwater emitting device provided by the present application. DETAILED DESCRIPTION

[0036] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in combination with the drawings and embodiments in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] It should be noted that, in the description of the embodiments of the present application, the terms “comprise”, “contain” or any other variants thereof are intended to cover non-exclusive inclusion, so that the method, step or device comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such method, step or device. Without more limitation, the element defined by the statement “comprises a” does not exclude the presence of another identical element in the method, step or device comprising the element.

[0038] In order to solve the problem that the wide-range capture of beacon light and the high-rate information transmission of communication light cannot be taken into account in special application scenarios such as underwater, the present application provides an underwater blue-green light emitting device which can effectively take into account wide-range capture and high-rate information transmission, as shown in Figure 1 The emitting device comprises, in sequence along the light path direction, a signal source, a light source module, a control switch and an optical antenna.

[0039] The signal source is configured to modulate the first light source unit with a signal to generate high-speed signal light.

[0040] The light source module comprises a first light source unit as a communication light source and a second light source unit as a beacon light source, and the optical axes of the first light source unit and the second light source unit are parallel.

[0041] The light source center of the first light source unit and the second light source unit is coaxial. That is, the light source center point of the first light source unit coincides with the light source center point of the second light source unit, and the second light source unit includes a plurality of second light sources, which are arranged in a central symmetry around the light source center point of the first light source unit.

[0042] That is, the coaxial light source of the communication light and the beacon light is formed according to the distribution principle that the center is the communication light source and the periphery is the beacon light source. The second light source unit is a light source array, which includes a plurality of second light sources arranged in a central symmetry around the periphery of the first light source unit to form a ring-shaped light source array.

[0043] Preferably, the light source center point of the first light source unit is arranged at the center of the light source module, and the plurality of second light sources are arranged in a central symmetry around the center point of the light source module. That is, the light source center point of the first light source unit, the light source center point of the second light source unit, and the center of the light source module are coincident.

[0044] As an embodiment, the first light source unit includes one or more first light sources.

[0045] When the first light source is one, the light source center point of the first light source coincides with the light source center point of the second light source unit; when the first light source is a plurality, the light source center point of the first light source unit composed of the plurality of first light sources coincides with the light source center point of the second light source unit.

[0046] Further, when the light source center point of the first light source unit is arranged at the center of the light source module, when the first light source is one, the light source center point of the first light source coincides with the center point of the light source module; when the first light source is a plurality, the plurality of first light sources are arranged in a central symmetry around the center point of the light source module.

[0047] It should be noted that the first light source unit with high bandwidth and small divergence angle is used as the communication light source, and the second light source unit with large power and large divergence angle is used as the beacon light source.

[0048] The first light source is used for transmitting and tracking high-speed signals, has the characteristics of high bandwidth and small divergence angle, can transmit high-speed signals without easy divergence, and is used for accurate tracking and high-speed communication. The high-speed signal refers to a digital signal with a relatively high transmission rate, specifically a signal with a transmission rate greater than Mbps. The second light source is used for spot coverage and illumination, has the characteristics of large power and large divergence angle, can cover a large range of spots, reduces spot scanning time, and can also be used as an illumination light source.

[0049] As an embodiment, the first light source has a high modulation bandwidth, a first power and a first emission angle; the second light source has a second power and a second emission angle; the high modulation bandwidth refers to a bandwidth that enables the modulator to work normally in a high frequency range. More specifically, the first power is less than the second power by at least one order of magnitude; the first emission angle is less than the second emission angle by at least ten times.

[0050] That is, the power of the second light source is several orders of magnitude greater than that of the first light source, and the divergence angle of the second light source is more than ten times greater than that of the first light source; as for the bandwidth, the second light source can be powered by DC and does not require a good bandwidth, and can work below khz, while the first light source requires a high modulation bandwidth of 10M or even Gbps.

[0051] For example, in order to ensure a stable modulation rate of 10M or even Gbps or above, the first light source has a power of about 100-1000mW and a small divergence angle of less than mrad; a single second light source has a large power of 1-10W and a large divergence angle of more than 5 degrees; and the second light source unit array including multiple second light sources has a power of 10-900W.

[0052] In addition, the wavelengths of the first light source and the second light source are preferably the same.

[0053] As a preferred embodiment, the first light source can be an LD light source, and the second light source can be an LED light source.

[0054] As shown in Figure 2 , a schematic diagram of a light source module of an underwater coaxial dual-light-source emitting device provided by the present application is shown. Figure 1 The LD light source with a high bandwidth and a small divergence angle is one, located at the geometric center of the light source module, that is, the light source center point of the LD light source coincides with the center point of the light source module; the LED light source with a large power and a large divergence angle is multiple, uniformly placed in a central symmetric distribution around the outside of the LD light source and taking the LD light source as the center. The LD light source with a high bandwidth and a small divergence angle is used as a communication light source, which can compensate for the emission light power by compressing the divergence angle to ensure the high modulation rate of the communication light; the LED light source with a large power and a large divergence angle is used as a beacon light source, which can achieve a large range of spot coverage without considering the bandwidth limitation condition when a large power output is not required.

[0055] As shown in Figure 3 , a schematic diagram of a light source module of an underwater coaxial dual-light-source emitting device provided by the present application is shown. Figure 2, also follow the distribution principle of center for communication light source and periphery for beacon light source to constitute the coaxial light source of communication light and beacon light. The LD light source with high bandwidth and small divergence angle is multiple, and the multiple LD light sources are arranged in the geometric center of the emission device in a multi-in-one manner, that is, the multiple LD light sources are arranged in a central symmetry around the center point of the light source module. One central communication light source composed of multiple LD light sources can improve the overall emission optical power of the communication light; at the same time, the multiple LED light sources as beacon light sources are uniformly placed around the outside of the LD light source and are in a central symmetry distribution with the LD light source as the center.

[0056] Further, the beacon light source adopts a multi-ring light source distribution, with the communication light source as the center, and multiple layers of central symmetric ring arrays composed of second light sources are arranged. That is, with the communication light source as the center, more layers of LED light sources are arranged outward in turn, and each layer of LED light source is in a central symmetric ring array, so that the overall emission optical power of the captured beacon light can be improved.

[0057] Preferably, the number of second light sources in each layer is equal. For example, as shown in Figure 3 , eight LED light sources are arranged in the first layer, and eight LED light sources are arranged in the second layer.

[0058] The control switch is used to control the switching of the first light source unit and the second light source unit.

[0059] As an embodiment, the control switch includes two sub-switches, one sub-switch is connected to the first light source unit, and the other sub-switch is connected to the second light source unit.

[0060] Specifically, one sub-switch is connected to multiple first light sources to simultaneously control the switching of multiple LD light sources, and the other sub-switch is connected to multiple second light sources to simultaneously control the switching of multiple LED light sources, thereby realizing the unified switching of all LD light sources and the unified switching of all LED light sources by the control switch.

[0061] The control switch is used to control the switching of the first light source and the second light source, including: in the scanning and capturing stage, the second light source is turned on; after completing the scanning and capturing stage, entering the tracking communication stage, turning on the first light source while turning off the second light source, and using the first light source for tracking and information transmission. That is, the scanning and capturing stage uses LED light source, and the tracking communication stage uses LD light source.

[0062] It should be noted that the control switch can multiplex the capture beacon light and the high-speed communication light in time. For example, in the scanning capture phase, the LED light source is turned on to establish a link, and after the scanning capture phase is completed, the LD light source is turned on and the LED light source is turned off, and the LD light source is used for tracking and high-speed information transmission, so as to meet the communication requirements of large-range capture and high-speed information transmission of the same wavelength light source under water.

[0063] The control switch can control the light path of the light source or control the power supply of the light source, which is not limited here. The control switch includes but is not limited to a circuit switch, a linear polarizer, and a mechanical switch.

[0064] The control switch is preferably a circuit switch, which directly controls the power supply of the first light source unit and the second light source unit. The control switch can also be a linear polarizer, which controls the switch of the first light source unit and the second light source unit by converting the polarization state of the output light of the first light source unit and the second light source unit into two linear polarization states that are orthogonal to each other.

[0065] The optical antenna is used to combine and emit the first light source unit and the second light source unit with parallel optical axes in the same direction.

[0066] It should be noted that the optical antenna has unidirectional transmission, and can emit the communication light and the beacon light in the same direction. Since the optical axes of the first light source unit and the second light source unit are parallel, the combined light is emitted in the same direction after passing through the optical antenna, so that a transmission spot can be formed in space, with the center being the high-speed communication light and the periphery being the capture beacon light.

[0067] It should be noted that, as shown in Figure 4 Since the beacon light emitted by the second light source unit symmetrically distributed around the first light source unit overlaps in space, the overall spot center coincides with the spot center of the communication light of the first light source unit, so that after the beacon light completes the capture alignment, the communication light can be accurately incident into the receiving window of the receiving end. Although there is strong beacon light intensity at the spot center of the beacon light, the second light source unit is controlled by the control switch, and the second light source unit is turned off after the scanning capture phase is completed, so that the capture beacon light generated by the second light source unit can be isolated and filtered out by time multiplexing at the receiving end, and the light signal entering the receiving window of the receiving end in the tracking communication phase is only the high-speed communication light generated by the first light source unit, so that the transmission device can meet the communication requirements of large-range capture of the beacon light and high-speed information transmission of the communication light.

[0068] On the other hand, the application also provides an underwater double-end high-speed optical communication method, which uses a transmission device for spatial optical communication.

[0069] As an embodiment, the second light source unit of the first transmitting device and the second transmitting device is turned on at the same time to obtain the first beacon light spot signal and the second beacon light spot signal;

[0070] The first transmitting device and the second transmitting device are rotated to scan and align with each other, so that the optical axes of the first beacon light spot signal and the second beacon light spot signal coincide with each other;

[0071] The first light source unit of the first transmitting device and the second transmitting device is turned on at the same time to obtain the first communication light spot signal and the second communication light spot signal, and it is ensured that the first communication light spot signal emitted by the first transmitting device covers the receiving end of the second transmitting device;

[0072] The second light source unit of the first transmitting device and the second transmitting device is turned off at the same time, real-time tracking is performed according to the first communication light spot signal and the second communication light spot signal, and the link is kept stable;

[0073] The first light source unit is subjected to signal debugging to generate high-speed signal light, and underwater double-end high-speed optical communication is realized.

[0074] For example, as shown in Figure 5 As a specific embodiment, when the underwater optical communication system is ready to build a link, the double-end turns on the LED light source array through the control switch to form a large divergence angle and high-power blue-green light spot; the double-end starts to scan each other, and when the capture detection units of the A / B end receive the LED emission spot signals of the opposite end respectively, the rotation is completed to align with each other; after the preliminary capture alignment is completed, that is, when the optical axes of the A / B end are basically coincident, the LD light source is turned on to ensure that the emission spot of the LD can well cover the receiving end of the opposite end; at this time, the LED light source with a large divergence angle is turned off, and the LD light source with a small divergence angle is retained, and accurate tracking is performed according to the emission spot of the LD light source to keep the link stable; finally, the LD light source is subjected to high-speed signal debugging by the signal source to generate high-speed signal light, and underwater double-end high-speed optical communication is started.

[0075] The underwater double-end high-speed optical communication method provided by the application can be performed separately in time based on the capture alignment of the large divergence angle and the tracking communication based on the small divergence angle, and does not affect each other, thereby realizing the purpose of simultaneously considering large-range rapid capture and high-rate information transmission.

[0076] In summary, the application provides a kind of underwater coaxial double light source transmitting device and double-end high-speed optical communication method, which can solve the problem that beacon light cannot be captured in a large range and high-rate information transmission of communication light cannot be considered in special application scenarios such as underwater.

[0077] It should be noted that, for the aforementioned various embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited to the order of the actions described, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0078] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0079] In several embodiments provided by the present application, it should be understood that the disclosed method or system can be implemented by other means. For example, the above-described embodiments are only illustrative, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0080] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., they can be located in one place or distributed on multiple network units. Part or all of the units can be selected to achieve the purpose of the embodiment scheme according to actual needs.

[0081] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present alone, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0082] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a computer readable memory. Based on this understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product, which is stored in a memory and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application.

[0083] Those skilled in the art can understand that all or part of the circuits in the above embodiments can be programmed to instruct the relevant hardware to complete, and the program can be stored in a computer readable memory, which can include a flash disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0084] The above merely describes exemplary embodiments of the present disclosure, and cannot limit the scope of the present disclosure. Any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. Those skilled in the art will easily think of the embodiments of the present disclosure after considering the specification and practicing the disclosure herein. The present application is intended to cover any variations, uses, or adaptive changes of the present disclosure that follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field not recorded in the present disclosure. The specification and examples are only considered to be exemplary, and the scope and spirit of the present disclosure are defined by the claims.

[0085] The technical features of the above embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not contradict, they should be considered to be within the scope of the present disclosure.

[0086] Those skilled in the art will readily understand that the above described are merely preferred embodiments of the present application and are not intended to limit the present application, and any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An underwater coaxial dual-light source transmitting device, characterized in that: The emitting device includes: A signal source, configured to perform signal modulation on the first light source unit; A light source module, comprising a first light source unit serving as a communication light source and a second light source unit serving as a beacon light source, wherein the optical axes of the first light source unit and the second light source unit are parallel; a light source center point of the first light source unit coincides with a light source center point of the second light source unit; and the second light source unit comprises a plurality of second light sources, wherein the plurality of second light sources are centrally symmetrically arranged around the light source center point of the first light source unit. A control switch, used to control the switching of the first light source unit and the second light source unit; An optical antenna, configured to combine a first light source unit and a second light source unit with parallel optical axes and emit the light in the same direction; The method for performing spatial optical communication using the transmitting device includes: Simultaneously turning on the first emitting device and the second light source unit of the second emitting device to obtain a first beacon light spot signal and a second beacon light spot signal; Rotate the first transmitting device and the second transmitting device to scan and align with each other so that the optical axes of the first beacon light spot signal and the second beacon light spot signal coincide with each other; Simultaneously turn on the first light source units of the first transmitting device and the second transmitting device to obtain the first communication light spot signal and the second communication light spot signal, and ensure that the first communication light spot signal emitted by the first transmitting device covers the receiving end of the second transmitting device; At the same time, the second light source units of the first transmitting device and the second transmitting device are turned off, and real-time tracking is performed based on the first communication light spot signal and the second communication light spot signal to maintain link stability; Signal debugging is performed on the first light source unit to generate high-speed signal light to achieve underwater two-end high-speed optical communication.

2. The underwater coaxial dual-light source transmitting device according to claim 1, characterized in that: The first light source has a first power and a first emission angle, and is used for high-speed signal transmission and tracking; the second light source has a second power and a second emission angle, and is used for light spot coverage and illumination; wherein the first power is less than the second power, and the difference is at least one order of magnitude; the first emission angle is less than the second emission angle, and the difference is at least ten times.

3. The underwater coaxial dual-light source emitting device according to claim 1, characterized in that: The first light source unit includes one or more first light sources; When there is only one first light source, the center point of the first light source coincides with the center point of the light source module; When there are multiple first light sources, the multiple first light sources are centrally symmetrically arranged around the center point of the light source module.

4. The underwater coaxial dual-light source transmitting device according to claim 3, characterized in that: The first light source is an LD light source, and the second light source is an LED light source.

5. The underwater coaxial dual-light source transmitting device according to claim 1, characterized in that: The beacon light source adopts a multi-ring light source distribution, with the communication light source as the center and multiple layers of central symmetrical ring arrays composed of second light sources are arranged.

6. The underwater coaxial dual-light source transmitting device according to claim 1, characterized in that: The control switch includes two sub-switches, one sub-switch is connected to the first light source unit, and the other sub-switch is connected to the second light source unit.

7. The underwater coaxial dual-light source emitting device according to claim 1, characterized in that: The control switch controls the switching of the first light source and the second light source, including: turning on the second light source in the scanning and capturing phase; and turning on the first light source while turning off the second light source in the tracking and communication phase after completing the scanning and capturing phase.

8. The underwater coaxial dual-light source transmitting device according to claim 1, characterized in that: The control switch includes but is not limited to a linear polarizer, a circuit switch, and a mechanical switch.

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