Laser communication transmitting device and method compatible with OOK and BPSK

Abstract

The invention discloses an OOK and BPSK compatible laser communication transmitting device and method, and belongs to the technical field of laser communication, and the device comprises a narrow linewidth laser light source, a dual-output electro-optical modulator, a driving amplifier, a bias control circuit and a signal generation digital-analog unit. The OOK and BPSK modulation formats are realized on the same hardware device, a signal generation digital-analog unit generates a pseudo-random code pattern signal with a certain rate, the pseudo-random code pattern signal is amplified by a driving amplifier and then modulated on an optical carrier output by a narrow linewidth laser light source through a dual-output electro-optical modulator, and the optical carrier output by the narrow linewidth laser light source is amplified by the dual-output electro-optical modulator. The working point of the dual-output electro-optical modulator is controlled through a bias control circuit; the two output optical ports of the dual-output electro-optical modulator can generate two different types of modulation optical signals of OOK and BPSK, support the system to establish two laser communication links at the same time or in a time-sharing manner, realize resource multiplexing, reduce the system cost, and further improve the flexibility of communication link establishment.

Description

Technical Field

[0001] The present invention relates to the field of laser communication technology, and more specifically, to an OOK and BPSK compatible laser communication transmitting device and method. Background Art

[0003] In satellite laser communications, OOK and BPSK systems have been widely used. The OOK incoherent communication system has the advantages of simple demodulation and easy communication link establishment, and is suitable for low-speed, short-distance application scenarios; the BPSK coherent communication system has high sensitivity and is suitable for medium- and long-distance, high-speed communication needs. OOK and BPSK modulation formats will exist for a long time in the future. In order to make laser communication links adapt to a variety of application scenarios and improve the flexibility of communication link establishment, OOK and BPSK compatible laser communication methods are very necessary. The two complement each other, enabling the system to switch modulation formats according to actual communication distance, data transmission rate, etc., to improve the probability of successful link establishment and communication quality. At present, there are relatively few multi-system compatible laser communication systems, and they are usually based on the generation of different types of modulation format signals on a single channel. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an OOK and BPSK compatible laser communication transmitting device and method. Based on a single-channel transmitting device, it is possible to simultaneously / time-share generate two-channel OOK / BPSK modulation format signals, thereby achieving resource sharing, reducing costs, and further improving the flexibility of communication link establishment.

[0005] The object of the present invention is achieved through the following solutions:

[0006] An OOK and BPSK compatible laser communication transmitting device, comprising:

[0007] narrow linewidth laser source, dual-output electro-optic modulator, driver amplifier, bias control circuit and signal generation digital-to-analog unit;

[0008] The implementation of OOK and BPSK modulation formats is completed on the same set of hardware devices. The signal generation digital-analog unit generates a pseudo-random code signal with a certain rate. After being amplified by the driving amplifier, it is modulated on the optical carrier output by the narrow linewidth laser light source through a dual-output electro-optical modulator. The working point of the dual-output electro-optical modulator is controlled by a bias control circuit; the two output optical ports of the dual-output electro-optical modulator can generate two different types of modulated optical signals, OOK and BPSK, and support the system to establish two laser communication links simultaneously or in time-sharing manner to realize resource multiplexing.

[0009] Furthermore, the bias control circuit controls the bias operating point of the dual-output electro-optical modulator, thereby changing the relationship between the modulated light output carrier and the sideband, thereby achieving the generation of OOK and BPSK different modulation format signals.

[0010] Furthermore, the output end of the dual-output electro-optic modulator adopts a directional coupler to provide two optical outputs, and the two optical output ports have complementary optical output power modulation characteristic curves.

[0011] Furthermore, when the first output port OUT1 of the dual-output electro-optic modulator operates at the positive / negative slope quadrature bias point Q+ / Q-, the second output port OUT2 thereof operates at the Q- / Q+ operating point.

[0012] Furthermore, through the control of the bias control circuit, OUT1 and OUT2 of the dual-output electro-optic modulator can be made to work at the minimum point Min respectively.

[0013] An OOK and BPSK compatible laser communication transmitting method, based on the OOK and BPSK compatible laser communication transmitting device as described above, comprises the following steps:

[0014] By controlling and switching the working point of the dual-output electro-optical modulator in the laser communication transmitting device, based on the same set of hardware devices, it is possible to generate OOK and BPSK modulation format signals respectively, thus achieving compatibility of the two modulation formats.

[0015] And when the laser communication transmitting device works in Q+ / Q-, the OOK modulation signals of two channels can be generated simultaneously;

[0016] When the laser communication transmitting device works at the minimum point, the BPSK modulation signal generation of two channels can be realized in time sharing.

[0017] Furthermore, when the laser communication transmitting device operates at Q+ / Q-, the OOK modulation signals of two channels can be generated simultaneously, which specifically includes the following sub-steps:

[0018] When the radio frequency port of the dual-output electro-optical modulator (102) is loaded with "0", "1" digital signals, the first output port OUT1 works at Q+, and the second output port OUT2 works at Q-, after electro-optical modulation, the "0" and "1" codes correspond to high and low optical power states at the first output port OUT1 and the second output port OUT2 of the dual-output electro-optical modulator respectively; the laser communication transmitting device simultaneously generates two OOK modulation format signals, and the OOK modulation signals of the two output ports have a phase difference of π;

[0019] When OUT1 of the dual-output electro-optic modulator works at Q- and the second output port OUT2 works at Q+, the two output ports of the dual-output electro-optic modulator still generate two OOK modulated optical signals at the same time, but compared with working at the Q+ point, the generated waveform has a π phase difference.

[0020] Furthermore, when the dual-output modulator of the laser communication transmitting device operates at the Min point, the BPSK modulation signal generation of the two channels can be realized in time-sharing, which specifically includes the following sub-steps:

[0021] When the input waveform is a bipolar signal of "-1" and "1", and the first output port OUT1 of the dual-output electro-optical modulator works at the Min point, after electro-optical modulation, the "-1" code and the "1" code correspond to two different optical modulation signal phases, and the electric field intensity phase difference is π, that is, the BPSK modulated optical signal is generated;

[0022] When OUT2 works at the Min point, the phase difference between the electric field intensity of the light wave corresponding to the "-1" code and the "1" code is π. At this time, the OUT2 port of the dual-output modulator realizes the generation of BPSK optical modulation signal;

[0023] By controlling the bias point in a time-sharing manner, OUT1 and OUT2 of the dual-output modulator can be made to work at the minimum point respectively, and the BPSK modulation signal generation of the two channels can be realized in a time-sharing manner.

[0024] Furthermore, the dual-output electro-optic modulator is a dual-output Mach-Zehnder modulator.

[0025] The beneficial effects of the present invention include:

[0026] The present invention provides an OOK and BPSK compatible laser communication transmitting device and method, which can realize the optical output of OOK and BPSK modulation format signals based on the same set of hardware devices. In the OOK modulation working mode, a single laser communication transmitting device can simultaneously generate two channels of OOK modulation format signals, supporting the establishment of two communication links at the same time; in the BPSK modulation working mode, a single laser communication transmitting device can generate two channels of BPSK modulation format signals in time-sharing, realizing the establishment of two communication links in time-sharing.

[0027] The present invention adopts an OOK and BPSK compatible laser communication transmission method based on a dual-output electro-optical modulator. On the one hand, it realizes the compatible generation of the above two modulation formats and improves the flexibility of communication link establishment; on the other hand, based on the same set of transmitting devices, it can support the simultaneous or time-sharing establishment of two laser communication links, further improving the flexibility of system link establishment, while also realizing resource reuse and reducing the cost of laser transmitting devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 It is a laser communication transmitting device compatible with OOK and BPSK;

[0030] Figure 2 It is the optical power modulation curve of the two output ports of the dual-output electro-optic modulator;

[0031] Figure 3 When OUT1 works at Q+, the OOK modulation format of the laser communication transmitting device generates (a) OUT1 outputs an OOK modulation format signal; (b) OUT2 outputs an OOK modulation format signal;

[0032] Figure 4 When OUT1 works in Q-mode, the OOK modulation format of the laser communication transmitting device is generated: (a) OUT1 outputs an OOK modulation format signal; (b) OUT2 outputs an OOK modulation format signal;

[0033] Figure 5 Generates BPSK optical modulation signal for the OUT1 port of the laser communication transmitting device;

[0034] Figure 6 Generates BPSK optical modulation signal for the OUT2 port of the laser communication transmitting device;

[0035] Figure 7 It is an example of a laser communication transmitting device;

[0036] Figure 8 The optical output electric field and demodulation constellation diagram of the laser communication transmitter under the OOK modulation format are shown as follows: (a) the output when OUT1 works at Q+; (b) the output when OUT2 works at Q-.

[0037] Fig. 9 It is a schematic diagram of the OUT1 / OUT2 modulated light output electric field and constellation diagram of the laser communication transmitting device under the BPSK modulation format;

[0038] In the figure, 101 is a narrow linewidth laser light source, 102 is a dual-output electro-optic modulator, 103 is a driver amplifier, 104 is a bias control circuit, and 105 is a signal generation digital-to-analog unit. DETAILED DESCRIPTION

[0039] All features disclosed in all embodiments in this specification, or steps in all methods or processes implicitly disclosed, except for mutually exclusive features and / or steps, can be combined and / or expanded or replaced in any manner.

[0040] The specific implementation process of the present invention is as follows:

[0041] Figure 1 An OOK and BPSK compatible laser communication transmitting device provided in a preferred embodiment of the present invention includes a narrow linewidth laser light source 101, a dual-output electro-optical modulator 102, a driving amplifier 103, a bias control circuit 104 and a signal generating digital-to-analog unit 105.

[0042] The present invention mainly controls the bias operating point of the dual-output electro-optical modulator, thereby changing the relationship between the modulated optical output carrier and the sideband, thereby realizing the generation of OOK and BPSK different modulation format signals. At the same time, the output end of the dual-output electro-optical modulator adopts a directional coupler, which can provide two optical outputs, and the two optical output ports have complementary optical output power modulation characteristic curves, such as Figure 2 As shown, when the first output port OUT1 of the dual-output electro-optical modulation works at the positive / negative slope quadrature bias point (Q+ / Q-), the second output port OUT2 works at the Q- / Q+ working point; and through the control of the bias control circuit, the OUT1 and OUT2 of the dual-output electro-optical modulator can be respectively operated at the minimum point (Min). Based on a single-channel laser communication transmitting device, when the dual-output electro-optical modulator works at Q+ / Q-, it can simultaneously realize the generation of two OOK modulated optical signals; when the dual-output electro-optical modulator works at Min, it can realize the generation of two BPSK modulated optical signals in time-sharing. Using the laser communication method and device proposed in the present invention, based on a single channel, the compatible generation of OOK and BPSK modulation formats and the output of two channel modulated signals can be realized.

[0043] When the dual-output electro-optic modulator works in push-pull mode, the field strength at the two output ports can be expressed as:

[0044]

[0045] Where Vπ is the modulator half-wave voltage, V DC is the modulator DC bias voltage, V(t) is the input waveform signal, E in (t) = E o exp(jω o t) is the electric field of the input optical carrier, E o With ω o are the amplitude and angular frequency of the optical carrier respectively, m=πV / V π is the modulation depth.

[0046] The output optical power of the two output ports of the dual-output electro-optic modulator can be expressed as:

[0047]

[0048] Among them, P in is the input optical power. It can be seen that the optical powers of the two output ports are complementary to each other, which lays a theoretical foundation for the two channels to simultaneously generate OOK modulation format signals.

[0049] When the RF port of the dual-output electro-optical modulator is loaded with "0", "1" digital signals, and the first output port OUT1 works at Q+ (the second output port OUT2 works at Q-), after electro-optical modulation, at the first output port OUT1 and the second output port OUT2 of the dual-output electro-optical modulator, the "0" and "1" codes correspond to high and low optical power states respectively, that is, two OOK modulation format signals are generated at the same time. The principle is as follows Figure 3 As shown in the figure, since the two output ports have complementary optical power modulation curves, the OOK modulated signals of the two output ports have a phase difference of π. When OUT1 of the dual-output electro-optical modulator works at Q-, the two output ports of the dual-output electro-optical modulator can still generate two OOK modulated optical signals at the same time, but compared with working at the Q+ point, the generated waveform phase has a phase difference of π, as shown in the figure. Figure 4 Therefore, by using the laser communication transmitting device proposed in the present invention, when the dual-output electro-optical modulator works at Q+ or Q-, two OOK modulated optical signals can be generated simultaneously.

[0050] When the input waveform is a bipolar signal of "-1" and "1", and OUT1 works at the minimum point, after electro-optical modulation, the "-1" code and the "1" code correspond to two different optical modulation signal phases, and the phase difference of the electric field intensity of the light wave is π, which completes the generation of the BPSK modulated optical signal. The principle is as follows: Figure 5 Similarly, when OUT2 is at the Min point, the electric field intensity phase difference between the "-1" code and the "1" code is π. At this time, the OUT2 port of the dual-output electro-optical modulator realizes the generation of BPSK optical modulation signals. The principle is as follows Figure 6 As shown. Therefore, by controlling the Min bias operating point, the generation of two channel BPSK modulation signals can be realized in time sharing. When the waveform injected into the modulator RF interface is not full amplitude input, it only brings additional loss and does not affect the phase modulation itself.

[0051] By controlling and switching the working point of the dual-output electro-optical modulator in the laser communication transmitting device, based on the same set of hardware devices, the generation of OOK and BPSK modulation format signals can be realized respectively, thus achieving compatibility of the two modulation formats. And when the laser communication transmitting device works at the Q+ / Q- point, the OOK modulation signals of the two channels can be generated simultaneously; when the laser communication transmitting device works at the Min point, the BPSK modulation signal generation of the two channels can be realized in time-sharing. The laser communication transmitting method and device proposed in the present invention can effectively improve the flexibility of establishing a communication link, while realizing resource reuse and reducing the cost of the laser transmitting device.

[0052] In other embodiments of the present invention, the following implementation modes are also provided:

[0053] The specific working process of the OOK and BPSK compatible laser communication transmitting device is as follows: First, the signal generating digital-analog unit generates a digital waveform with a certain rate, which is amplified by the driving amplifier and modulated on the optical carrier output by the narrow linewidth laser light source through the dual-output electro-optical modulator. The working point of the dual-output electro-optical modulator is controlled by the bias control circuit, and a modulated optical signal is generated at the two output optical ports OUT1 and OUT2 of the dual-output electro-optical modulator. An example of an OOK and BPSK compatible laser communication transmitting device is as follows: Figure 7 As shown. Based on a single-channel laser communication transmitting device, OOK and BPSK modulation format signals can be generated, and the simultaneous / time-sharing generation of two-channel modulation signals can be supported, supporting the system to establish two laser communication links.

[0054] The specific principle is as follows: When the dual-output electro-optic modulator OUT1 works at Q+ (OUT2 works at Q-) under the control of the bias control circuit, and assuming that the peak-to-peak value of the input signal waveform is V pp =V π At the two output ports of the laser communication transmitter, the "0" and "1" codes correspond to two different light wave powers, and OOK modulation is realized at the same time. The phase difference between the two OOK modulated signals is π. The input waveform, laser modulation output electric field and demodulation constellation diagram are shown in the figure below. Figure 8 shown.

[0055] When the dual-output electro-optic modulator OUT1 / OUT2 works at the minimum point under the control of the bias control circuit and is amplified by the driving amplifier, the signal waveform injected into the dual-output electro-optic modulator port is peak-to-peak value V pp =2V π When the bipolar code is used, in the generated modulated optical signal, the "-1" and "1" codes correspond to the same direction and reverse direction light wave field intensity respectively, realizing BPSK modulation. The input waveform, laser modulation output electric field and constellation diagram are shown in the figure below. Fig. 9By controlling the minimum operating points of modulators OUT1 and OUT2, BPSK modulation can be realized at two output ends of the laser communication transmitting device in a time-sharing manner.

[0056] In summary, the embodiment of the present invention is based on the same set of hardware devices, and by controlling the dual-output electro-optical modulator to work at different bias operating points, it can be compatible with the optical generation of OOK and BPSK modulation format signals. Using the laser communication transmission method proposed in the present invention, the two modulated light output ports can simultaneously and time-sharingly generate two-channel OOK and BPSK modulation format optical signals, supporting the laser communication transmitting device to realize the interconnection of two laser communication links. This enables the OOK and BPSK compatible laser communication transmitting device to better adapt to a variety of different on-board application scenarios, improve the chain building flexibility of the inter-satellite laser communication system, and reduce system costs.

[0057] It should be noted that within the scope of protection defined in the claims of the present invention, the following embodiments can be combined and / or expanded or replaced in any logical way from the above specific implementation methods, such as disclosed technical principles, disclosed technical features or implicitly disclosed technical features.

[0058] Example 1

[0059] An OOK and BPSK compatible laser communication transmitting device, comprising:

[0060] Narrow linewidth laser light source 101, dual output electro-optic modulator 102, driver amplifier 103, bias control circuit 104 and signal generation digital-analog unit 105;

[0061] The implementation of OOK and BPSK modulation formats is completed on the same set of hardware devices. The signal generation digital-analog unit 105 generates a pseudo-random code signal with a certain rate. After being amplified by the driving amplifier 103, it is modulated on the optical carrier output by the narrow linewidth laser light source 101 through the dual-output electro-optical modulator 102. The working point of the dual-output electro-optical modulator 102 is controlled by the bias control circuit 104; the two output optical ports of the dual-output electro-optical modulator 102 can generate two different types of modulated optical signals, OOK and BPSK, to support the system to establish two laser communication links simultaneously or in time-sharing manner to achieve resource multiplexing.

[0062] Example 2

[0063] On the basis of Example 1, the bias control circuit 104 controls the bias operating point of the dual-output electro-optical modulator 102, thereby changing the relationship between the modulated light output carrier and the sideband, thereby realizing the generation of OOK and BPSK different modulation format signals.

[0064] Example 3

[0065] On the basis of Example 1, the output end of the dual-output electro-optic modulator 102 adopts a directional coupler to provide two optical outputs, and the two optical output ports have complementary optical output power modulation characteristic curves.

[0066] Example 4

[0067] On the basis of Embodiment 3, when the first output port OUT1 of the dual-output electro-optic modulator 102 operates at the positive / negative slope quadrature bias point Q+ / Q-, the second output port OUT2 operates at the Q- / Q+ operating point.

[0068] Example 5

[0069] On the basis of the fourth embodiment, through the control of the bias control circuit, the OUT1 and OUT2 of the dual-output electro-optic modulator 102 can be made to work at the minimum point Min respectively.

[0070] Example 6

[0071] An OOK and BPSK compatible laser communication transmitting method, based on the OOK and BPSK compatible laser communication transmitting device described in Example 1, comprises the following steps:

[0072] By controlling and switching the working point of the dual-output electro-optical modulator 102 in the laser communication transmitting device, based on the same set of hardware devices, signals of OOK and BPSK modulation formats can be generated respectively to achieve compatibility of the two modulation formats;

[0073] And when the laser communication transmitting device works in Q+ / Q-, the OOK modulation signals of two channels can be generated simultaneously;

[0074] When the laser communication transmitting device works at the minimum point, the BPSK modulation signal generation of two channels can be realized in time sharing.

[0075] Example 7

[0076] On the basis of Example 6, when the laser communication transmitting device operates at Q+ / Q-, the OOK modulation signals of the two channels can be generated simultaneously, which specifically includes the following sub-steps:

[0077] When the RF port of the dual-output electro-optical modulator (102) is loaded with digital signals "0" and "1", the first output port OUT1 works at Q+, and the second output port OUT2 works at Q-, after electro-optical modulation, the "0" and "1" codes correspond to high and low optical power states at the first output port OUT1 and the second output port OUT2 of the dual-output electro-optical modulator 102, respectively, and thus the generation of OOK modulated optical signals is realized; the laser communication transmitting device simultaneously generates two OOK modulation format signals, and the OOK modulated signals at the two output ports have a phase difference of π;

[0078] When OUT1 of the dual-output electro-optical modulator 102 works at Q- and the second output port OUT2 works at Q+, the two output ports of the dual-output electro-optical modulator 102 still generate two OOK modulated optical signals simultaneously, but compared with working at the Q+ point, the generated waveforms have a π phase difference.

[0079] Example 8

[0080] On the basis of Example 6, when the dual-output modulator of the laser communication transmitting device operates at the Min point, the BPSK modulation signal generation of two channels can be realized in time-sharing, which specifically includes the following sub-steps:

[0081] When the input waveform is a bipolar signal of "-1" and "1", and the first output port OUT1 of the dual-output electro-optical modulator 102 works at the Min point, after electro-optical modulation, the "-1" code and the "1" code correspond to two different optical modulation signal phases, and the electric field intensity phase difference is π, that is, the BPSK modulated optical signal is generated;

[0082] When OUT2 works at the Min point, the phase difference between the electric field intensity of the light wave corresponding to the "-1" code and the "1" code is π. At this time, the OUT2 port of the dual-output modulator realizes the generation of BPSK optical modulation signal;

[0083] By controlling the bias point in a time-sharing manner, OUT1 and OUT2 of the dual-output modulator can be made to work at the minimum point respectively, and the BPSK modulation signal generation of the two channels can be realized in a time-sharing manner.

[0084] When the waveform injected into the modulator's RF interface is less than the full amplitude input, it only causes additional loss and does not affect the phase modulation itself.

[0085] Example 9

[0086] On the basis of Example 6, the dual-output electro-optic modulator 102 is a dual-output Mach-Zehnder modulator.

[0087] The units involved in the embodiments of the present invention may be implemented by software or hardware, and the units described may also be arranged in a processor. The names of these units do not, in some cases, limit the units themselves.

[0088] According to one aspect of an embodiment of the present invention, a computer program product or a computer program is provided, the computer program product or the computer program includes a computer instruction, and the computer instruction is stored in a computer-readable storage medium. A processor of a computer device reads the computer instruction from the computer-readable storage medium, and the processor executes the computer instruction, so that the computer device executes the method provided in the above various optional implementations.

[0089] As another aspect, an embodiment of the present invention further provides a computer-readable medium, which may be included in the electronic device described in the above embodiment; or may exist independently without being assembled into the electronic device. The above computer-readable medium carries one or more programs, and when the above one or more programs are executed by an electronic device, the electronic device implements the method described in the above embodiment.

Claims

1. An OOK and BPSK compatible laser communication transmitting device, characterized in that: include: A narrow linewidth laser light source (101), a dual-output electro-optic modulator (102), a driver amplifier (103), a bias control circuit (104), and a signal generation digital-analog unit (105); The OOK and BPSK modulation formats are implemented on the same set of hardware devices. A signal generation digital-analog unit (105) generates a pseudo-random code signal with a certain rate. After being amplified by a driving amplifier (103), the signal is modulated on an optical carrier output by a narrow line width laser light source (101) through a dual-output electro-optical modulator (102). The working point of the dual-output electro-optical modulator (102) is controlled by a bias control circuit (104). The two output optical ports of the dual-output electro-optical modulator (102) can generate two different types of modulated optical signals, OOK and BPSK, and support the system to establish two laser communication links simultaneously or in time-sharing manner, thereby realizing resource multiplexing.

2. The OOK and BPSK compatible laser communication transmitting device according to claim 1, characterized in that: The bias control circuit (104) controls the bias operating point of the dual-output electro-optical modulator (102), thereby changing the relationship between the modulated light output carrier and the sideband, thereby realizing the generation of OOK and BPSK different modulation format signals.

3. The OOK and BPSK compatible laser communication transmitting device according to claim 1, characterized in that: The output end of the dual-output electro-optic modulator (102) adopts a directional coupler to provide two optical outputs, and the two optical output ports have complementary optical output power modulation characteristic curves.

4. The OOK and BPSK compatible laser communication transmitting device according to claim 3, characterized in that: When the first output port OUT1 of the dual-output electro-optic modulator (102) operates at the positive / negative slope quadrature bias point Q+ / Q-, the second output port OUT2 operates at the Q- / Q+ operating point.

5. The OOK and BPSK compatible laser communication transmitting device according to claim 4, characterized in that: Through the control of the bias control circuit, OUT1 and OUT2 of the dual-output electro-optic modulator (102) can be made to operate at the minimum point Min respectively.

6. A laser communication transmission method compatible with OOK and BPSK, characterized in that: The OOK and BPSK compatible laser communication transmitting device according to claim 1 comprises the following steps: By controlling and switching the working point of the dual-output electro-optical modulator (102) in the laser communication transmitting device, signals in two modulation formats, OOK and BPSK, can be generated respectively based on the same set of hardware devices, thereby achieving compatibility of the two modulation formats; And when the laser communication transmitting device works in Q+ / Q-, the OOK modulation signals of two channels can be generated simultaneously; When the laser communication transmitting device works at the minimum point, the BPSK modulation signal generation of two channels can be realized in time sharing.

7. The OOK and BPSK compatible laser communication transmission method according to claim 6, characterized in that: When the laser communication transmitting device operates at Q+ / Q-, the OOK modulation signals of two channels can be generated simultaneously, which specifically includes the following sub-steps: When the radio frequency port of the dual-output electro-optical modulator (102) is loaded with "0" and "1" digital signals, the first output port OUT1 works at Q+, and the second output port OUT2 works at Q-, after electro-optical modulation, at the first output port OUT1 and the second output port OUT2 of the dual-output electro-optical modulator (102), the "0" and "1" codes correspond to high and low optical power states respectively; the laser communication transmitting device simultaneously generates two OOK modulation format signals, and the OOK modulation signals of the two output ports have a phase difference of π; When OUT1 of the dual-output electro-optical modulator (102) operates at Q- and the second output port OUT2 operates at Q+, the two output ports of the dual-output electro-optical modulator (102) still generate two OOK modulated optical signals simultaneously, but compared with operating at the Q+ point, the generated waveforms have a phase difference of π.

8. The OOK and BPSK compatible laser communication transmission method according to claim 6, characterized in that: When the dual-output modulator of the laser communication transmitting device works at the Min point, the BPSK modulation signal generation of two channels can be realized in time-sharing, which specifically includes the following sub-steps: When the input waveform is a bipolar signal of "-1" and "1", and the first output port OUT1 of the dual-output electro-optical modulator (102) operates at the minimum point, after electro-optical modulation, the "-1" code and the "1" code respectively correspond to two different optical modulation signal phases, and the electric field intensity phase difference is π, that is, the BPSK modulated optical signal is generated; When OUT2 works at the Min point, the phase difference of the electric field intensity of the light wave corresponding to the "-1" code and the "1" code is π. At this time, the OUT2 port of the dual-output modulator realizes the generation of BPSK optical modulation signal; By controlling the bias point in a time-sharing manner, OUT1 and OUT2 of the dual-output modulator can be made to work at the minimum point respectively, and the BPSK modulation signal generation of the two channels can be realized in a time-sharing manner.

9. The OOK and BPSK compatible laser communication transmission method according to claim 6, characterized in that: The dual-output electro-optic modulator (102) is a dual-output Mach-Zehnder modulator.

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