CN111698040A - Underwater large dynamic blue-green laser communication receiving method and device based on polarization interference - Google Patents
Underwater large dynamic blue-green laser communication receiving method and device based on polarization interference Download PDFInfo
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- CN111698040A CN111698040A CN202010402509.4A CN202010402509A CN111698040A CN 111698040 A CN111698040 A CN 111698040A CN 202010402509 A CN202010402509 A CN 202010402509A CN 111698040 A CN111698040 A CN 111698040A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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Abstract
The application discloses an underwater large dynamic blue-green laser communication receiving method and device based on polarization interference; the method comprises the following steps: receiving a communication optical signal underwater; controlling the optical power of the communication optical signal by using the polarized light interference module so that the optical power of the communication optical signal passing through the polarized light interference module is within a preset recommended working range of the photoelectric detector; photoelectric detection is carried out on the communication optical signal passing through the polarization interference module by using a photoelectric detector, and a communication electric signal corresponding to the communication optical signal is output; the polarized light interference module controls the optical power of the communication optical signal by loading the control voltage to the polarized light interference module; the control voltage is generated by monitoring the amplitude of the communication electrical signal in real time through a feedback circuit. The underwater communication receiver has a large receiving dynamic range, and the self-adaptive capacity of the receiver to the working environment is improved.
Description
Technical Field
The application belongs to the technical field of underwater wireless communication, and particularly relates to an underwater large dynamic blue-green laser communication receiving method and device based on polarization interference.
Background
Underwater communication technology is of vital importance for marine engineering applications. Efficient data transmission is needed for both the return of subsea monitoring data and the information interaction between underwater mobile platforms. The underwater blue-green laser communication has the outstanding advantages of high transmission rate, low delay, light weight, small volume power consumption and the like, has wide application prospect in the field of short-distance wireless transmission, and becomes an important development direction of the underwater communication. In practical application, the optical power of the communication optical signal reaching the underwater communication receiver is greatly affected by the communication transmission distance and the seawater optical attenuation property, so that the optical power of the communication optical signal received by the receiver under different working environments is different in magnitude. For a communication optical signal with small optical power, the receiver needs to have sufficient sensitivity to achieve effective detection of the communication optical signal; when the optical power of the communication optical signal exceeds the rated working range of the photoelectric detector in the receiver, the detection accuracy of the photoelectric detector is influenced if the optical power of the communication optical signal exceeds the rated working range of the photoelectric detector in the receiver, and the photoelectric detector is damaged if the optical power of the communication optical signal exceeds the rated working range of the photoelectric detector in the receiver. Therefore, the underwater communication receiver needs to have a large reception dynamic range.
In the related art, in order to enable an underwater communication receiver to have a larger receiving dynamic range, a mechanical variable attenuator is added in front of a photoelectric detector of the receiver to change the transmittance of a communication optical signal, so that the receiving dynamic range of the receiver is improved; however, the mechanical rotation frequency of the mechanical variable attenuator is low, so that the response speed of the receiver to the communication optical signal is slow and not flexible enough; and frequent mechanical rotation can cause equipment wear and reduce the service life of the receiver.
Disclosure of Invention
In order to enable an underwater communication receiver to have a large receiving dynamic range and improve the self-adaptive adjusting capability of the receiver to the communication optical signal power, the application provides an underwater large dynamic blue-green laser communication receiving method and device based on polarization interference.
The technical problem to be solved by the application is realized by the following technical scheme:
in a first aspect, the present application provides a method for receiving underwater large dynamic blue-green laser communication based on polarization interference, including:
receiving a communication optical signal underwater; the carrier wave of the communication optical signal is a blue-green laser signal;
controlling the optical power of the communication optical signal by using a polarized light interference module so that the optical power of the communication optical signal after passing through the polarized light interference module is within a preset recommended working range of the photoelectric detector;
performing photoelectric detection on the communication optical signal passing through the polarization interference module by using the photoelectric detector, and outputting a communication electrical signal corresponding to the communication optical signal;
the polarized light interference module controls the optical power of the communication optical signal by loading control voltage to the polarized light interference module; the control voltage is generated by monitoring the amplitude of the communication electric signal in real time through a feedback circuit according to the amplitude.
Optionally, the polarization interference module includes a polarizer, an electro-optic modulation crystal, and an analyzer sequentially arranged along the traveling direction of the optical path;
the utilizing the polarized light interference module to control the optical power of the communication optical signal, so that the optical power of the communication optical signal passing through the polarized light interference module is within a preset recommended working range of the photoelectric detector, and the method comprises the following steps:
converting the communication optical signal into a linearly polarized optical signal by using the polarizer;
adjusting the polarization state of the polarized light signal by using an electro-optical modulation crystal, and enabling the polarized light signal with the adjusted polarization state to pass through the analyzer to obtain a communication light signal with the light power within the recommended working range of the photoelectric detector;
wherein the polarizing direction of the polarizer is the same as that of the analyzer; the control voltage is a bias voltage loaded on the electro-optic modulation crystal.
Optionally, an angle between the polarization direction of the polarizer and the intrinsic polarization direction of the electro-optic modulation crystal is 45 °.
Optionally, the polarizer and the analyzer are both spatial polarization devices with extinction ratio above 10 dB.
Optionally, the polarization interference modules include multiple groups, and the multiple groups of polarization interference modules are connected in series along the traveling direction of the optical path.
In a second aspect, the present application provides an underwater large dynamic blue-green laser communication receiving device based on polarization interference, including:
the receiving module is used for receiving the communication optical signal underwater; the carrier wave of the communication optical signal is a blue-green laser signal;
the polarized light interference module is used for controlling the optical power of the communication optical signal through the control voltage loaded to the polarized light interference module, so that the optical power of the communication optical signal after passing through the polarized light interference module is within a preset recommended working range of the photoelectric detector;
the photoelectric detector is used for performing photoelectric detection on the communication optical signal after passing through the polarization interference module and outputting a communication electric signal corresponding to the communication optical signal;
and the feedback circuit is used for monitoring the amplitude of the communication electric signal in real time and generating the control voltage according to the amplitude.
Optionally, the polarization interference module includes a polarizer, an electro-optic modulation crystal, and an analyzer sequentially arranged along the traveling direction of the optical path; the polarizing direction of the polarizer is the same as that of the analyzer; the control voltage is a bias voltage loaded on the electro-optic modulation crystal;
the polarizer is used for converting the communication optical signal into a linearly polarized optical signal;
the electro-optical modulation crystal is used for adjusting the polarization state of the polarized light signal by the bias voltage loaded to the electro-optical modulation crystal, so that the polarized light signal with the adjusted polarization state becomes a communication light signal with the light power within the recommended working range of the photoelectric detector after passing through the analyzer.
Optionally, an angle between the polarization direction of the polarizer and the intrinsic polarization direction of the electro-optic modulation crystal is 45 °.
Optionally, the polarizer and the analyzer are both spatial polarization devices with extinction ratio above 10 dB.
Optionally, the polarization interference modules include multiple groups, and the multiple groups of polarization interference modules are connected in series along the traveling direction of the optical path.
In the underwater large dynamic blue-green laser communication receiving method based on polarized light interference, the control voltage loaded on the polarized light interference module is controlled through a feedback module, so that the light power of a communication light signal is controlled; the feedback module monitors the amplitude of the communication electric signal output by the photoelectric detector in real time and generates control voltage according to the amplitude, so that the optical power of the communication optical signal output by the polarized light interference module can be adjusted to be within the recommended working range of the photoelectric detector by giving the polarized light interference module proper control voltage to any communication optical signal with different optical power; therefore, the underwater communication receiver can have a large receiving dynamic range; and because the polarized light interference module is a photoelectric device, the response speed to the communication optical signal is high, so that the embodiment of the application can enable the underwater communication receiver to have a large receiving dynamic range, and improve the self-adaptive capacity of the receiver to the working environment.
In addition, the application opens up the new application of the polarized light interference module, namely the polarized light interference module is applied to improving the receiving dynamic range of the underwater communication receiver.
The present application will be described in further detail below with reference to the attached drawings.
Drawings
Fig. 1 is a schematic flow diagram of an underwater large dynamic blue-green laser communication receiving method based on polarization interference according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an underwater large dynamic blue-green laser communication receiving device based on polarization interference according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of another underwater large dynamic blue-green laser communication receiving device based on polarization interference according to an embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to specific examples, but the embodiments of the present application are not limited thereto.
In order to enable an underwater communication receiver to have a large receiving dynamic range and improve the adaptive adjustment capability of the receiver on the communication light signal power, the embodiment of the application provides an underwater large dynamic blue-green laser communication receiving method and device based on polarization interference; the execution main body of the method provided by the embodiment of the application is an underwater large dynamic blue-green laser communication receiving device based on polarization interference; the device is applied to underwater communication equipment; in particular, the device is applied to a receiver of underwater communication equipment, namely the underwater communication receiver. It should be emphasized that the underwater communication devices referred to in the present application are all underwater blue-green laser communication devices, and the underwater communication receivers referred to in the present application are all underwater blue-green laser communication receivers.
First, a detailed description is given to an underwater large dynamic blue-green laser communication receiving method based on polarization interference provided by an embodiment of the present application, and as shown in fig. 1, the method may include the following steps:
s1: a communication light signal is received underwater.
Here, the communication optical signal is specifically an optical signal whose carrier is a blue-green laser signal, and includes useful information. The receiving of the communication optical signal is realized by a receiving module in the underwater communication receiver. Regarding the specific structure of the receiving module, the invention not in the embodiment of the present application can be referred to the corresponding module of the underwater communication receiver in the related art.
S2: and controlling the optical power of the communication optical signal by using the polarized light interference module so that the optical power of the communication optical signal passing through the polarized light interference module is within a preset recommended working range of the photoelectric detector.
The polarized light interference module controls the optical power of the communication optical signal by loading the control voltage to the polarized light interference module; the control voltage is generated by monitoring the amplitude of the communication electric signal output by the photoelectric detector in real time through a feedback circuit; the feedback circuit may be specifically built by using an FPGA (Field-Programmable Gate Array) and a peripheral hardware circuit of the FPGA. When the feedback circuit generates the control voltage, the current control voltage can be kept to be output when the voltage of the communication electric signal output by the photoelectric detector is the ideal working voltage; when the voltage of the communication electric signal output by the photoelectric detector is greater than or less than the ideal working voltage, the output control voltage is adjusted, so that the voltage of the communication electric signal output by the photoelectric detector is maintained at the ideal working voltage.
It is understood that the communication electrical signal is the communication electrical signal corresponding to the communication optical signal received in step S1.
In the related art, the polarization interference technology is mainly used in the measurement fields of measurement of crystal birefringence, measurement of optical elastography and refractive indexes of metals and films, inspection of elliptically polarized light, and the like, and no precedent is made for applying the module with the polarization interference function to increase the receiving dynamic range of the receiver.
In practical applications, there are various specific constituent structures of the polarization interference module. For example, in an alternative structure, the polarization interference module may include a polarizer, an electro-optic modulation crystal and an analyzer arranged in sequence along the direction of travel of the optical path; the polarizing direction of the polarizer is the same as that of the analyzer; the control voltage applied to the polarization interference module is applied to the electro-optic modulation crystal as a bias voltage. Thus, step S2 may include:
(1) the communication optical signal is converted into a linearly polarized optical signal by a polarizer.
In this step, the polarized light signal means that the vibration direction of the optical wave is no longer symmetrical with respect to the propagation direction of the optical wave after the communication light signal passes through the polarizer. That is, the polarized light signal is a communication light signal in which the light wave vibration direction is asymmetrical with respect to the light wave propagation direction.
(2) And adjusting the polarization state of the polarized light signal by using the electro-optical modulation crystal, and enabling the polarized light signal with the adjusted polarization state to pass through the analyzer to obtain a communication light signal with the light power within the recommended working range of the photoelectric detector.
It is understood that in step (2), the polarization state of the polarized optical signal passing through the electro-optical modulation crystal can be changed by changing the bias voltage applied to the electro-optical modulation crystal. Wherein, the electro-optical modulation crystal is plated with electrodes and has two orthogonal intrinsic polarization modes; the electro-optical modulation crystal adjusts the polarization state of the polarized light signal, and particularly, when the bias voltage loaded on the electrode of the electro-optical modulation crystal is changed, the phase delay difference of the optical field components in the directions of the two eigen-polarization modes is changed when the polarized light signal is transmitted.
After the polarization state of the polarized light signal is changed, the light power of the polarized light signal passing through the polarizer is correspondingly changed; therefore, the electro-optical modulation crystal is given a proper bias voltage, and a communication optical signal with optical power within the recommended working range of the photoelectric detector can be obtained after the analyzer.
In practical application, as the depth of underwater operation increases, the pressure born by the underwater communication equipment also increases; therefore, in order to reduce the pressure to which the underwater communication device is subjected and improve the reliability of the underwater communication device, the underwater communication device is generally required to have a small sealing volume. In the embodiment of the application, in order to reduce the sealing volume of the underwater communication equipment, the polarizer and the analyzer can adopt polaroids; therefore, compared with the mode of arranging the mechanical variable attenuator in front of the photoelectric detector in the related art, the polarization interference module used in the method provided by the embodiment of the application has smaller volume and is suitable for sealing underwater communication equipment with smaller volume.
In addition, the electro-optic modulation crystal has higher response bandwidth, so that the adaptive adjustment capability of the underwater communication receiver on the communication optical signal power can be improved.
S3: and performing photoelectric detection on the communication optical signal passing through the polarization interference module by using a photoelectric detector to obtain a communication electrical signal corresponding to the communication optical signal.
The photoelectric detector can adopt an avalanche photodiode or a photomultiplier tube to adapt to underwater communication equipment with small sealing volume.
Regarding the specific implementation manner of the photoelectric detector for performing photoelectric detection on the communication optical signal, the principles and implementation manners of photoelectric detection in related technologies can be referred to, which is not the invention point of the embodiment of the present application, and the embodiment of the present application is not described in detail.
It is understood that after the communication optical signal is converted into the communication electrical signal, the communication electrical signal may be further processed, such as demodulated, outputted, and so on.
It can be understood that the receiving module, the polarizer, the electro-optic modulation crystal, the analyzer and the photodetector are all components of the underwater communication receiver.
In the underwater large dynamic blue-green laser communication receiving method based on polarized light interference, the control voltage loaded on the polarized light interference module is controlled through a feedback module, so that the light power of a communication light signal is controlled; the feedback module monitors the amplitude of the communication electric signal output by the photoelectric detector in real time and generates control voltage according to the amplitude, so that the optical power of the communication optical signal output by the polarized light interference module can be adjusted to be within the recommended working range of the photoelectric detector by giving the polarized light interference module proper control voltage to any communication optical signal with different optical power; therefore, the underwater communication receiver can have a large receiving dynamic range; and because the polarized light interference module is a photoelectric device, the response speed to the communication optical signal is high, so that the embodiment of the application can enable the underwater communication receiver to have a large receiving dynamic range, and improve the self-adaptive capacity of the receiver to the communication optical signal power.
In addition, the application opens up the new application of the polarized light interference module, namely the polarized light interference module is applied to improving the receiving dynamic range of the underwater communication receiver.
Optionally, in order to improve the optical signal transmission effect of the polarizer and the electro-optic modulation crystal, an included angle between the polarization direction of the polarizer and the intrinsic polarization direction of the electro-optic modulation crystal may be set to 45 °; correspondingly, the included angle between the polarization direction of the analyzer and the intrinsic polarization direction of the electro-optic modulation crystal is also 45 degrees.
In an alternative implementation manner, in order to further reduce the sealing volume of the underwater communication equipment, the polarizer and the analyzer can adopt a space-type polarizer with an extinction ratio of more than 10 dB. The space-type polarization device is different from the polarization devices in the forms of optical waveguides and optical fibers, and the sealing volume of the underwater communication equipment can be effectively reduced without adding an additional optical coupling device. In practical applications, the spatial polarization device may be a spatial polarizer.
In addition, in the underwater large dynamic blue-green laser communication receiving method based on polarized light interference provided by the embodiment of the application, when the receiver is required to have a large receiving dynamic range, a plurality of polarized light interference modules can be adopted, and the polarized light interference modules can be connected in series, so that the underwater communication receiver can obtain a large receiving dynamic range.
Based on the above-mentioned underwater large dynamic blue-green laser communication receiving method based on polarization interference, the embodiment of the present application exemplarily shows a preferred embodiment, in which the central wavelength of the communication optical signal is 532 nm, and the signal modulation format is intensity modulation. Here, the intensity modulation means that when the communication data is logic "0", it represents that there is no light in the communication optical signal; when the communication data is logic "1", the magnitude of the optical power P may be different under different usage environments. Therefore, in the process of receiving the communication optical signal, it is mainly ensured that the amplitude of the communication electrical signal output by the photodetector is within the normal operating range when the communication data is logic "1". The polarizer and the analyzer both adopt polaroids with extinction ratio of 20dB, and the polarization directions of the polarizer and the analyzer are the same. The intrinsic polarization direction of the electro-optic modulation crystal and the polarizing direction of the polarizer form an included angle of 45 degrees. The voltage responsivity of the photoelectric detector with 532 nm waveband is 105A volt/watt avalanche photodiode.
Wherein, when the bias voltage of the electro-optical modulation crystal is changed from 0 volt to 10 volts, the phase delay difference between two orthogonal eigen polarization modes of the electro-optical modulation crystal
Linearly varying from 0 to 2 pi, i.e. phase delay difference
The relationship with the bias voltage V of the electro-optic modulation crystal can be expressed as:
therefore, the range of the control voltage output by the feedback circuit is 0 to 10 volts.
In addition, the normal voltage range of the communication electric signal output by the photoelectric detector is 0.5-2V, and the ideal working voltage is 1V; therefore, the input voltage range of the feedback circuit can be set with a certain margin on the basis of 0.5 v to 2 v, such as 0 v to 2.5 v.
Based on the above setting, the process of executing the underwater large dynamic blue-green laser communication receiving method based on polarization interference may include:
(1) the received communication optical signal is converted into a linearly polarized optical signal by a polarizer. Assuming that the optical power of the communication optical signal is P, the power of the polarized optical signal becomes 0.505P.
(2) The polarized light signal is perpendicularly incident to the electro-optic modulation crystal. At this time, the light wave components in the polarization direction and the direction perpendicular thereto can be expressed by jones vector as:
(3) by setting the bias voltage of the electro-optical modulation crystal, the polarization state of the polarized light signal entering the electro-optical modulation crystal in the step (2) is changed, and the jones matrix of the polarized light signal at this time can be represented as:
wherein j represents the imaginary symbol and V is the bias voltage of the electro-optic modulation crystal.
The jones matrix of the polarized light signal at this time is sorted to obtain:
(4) after the polarized light signal passes through the analyzer, a communication light signal with the light power within the recommended working range of the photoelectric detector is obtained, and the Jones matrix of the communication light signal at the moment becomes:
for the Jones matrix E2The finishing is carried out to obtain:
optical power P of communication optical signal at this time1Can be expressed as:
wherein, the symbol
The operators are conjugate transpose operators. Will E2Substitution into P1After calculation of formula (2), P1Can be expressed as:
(5) utilizing a photoelectric detector to convert the communication optical signal P output by the step (4)1Converted into a communication electrical signal. The voltage U due to the communication electrical signal can be expressed as U-P1×105Thus, the voltage U can be expressed as:
based on the expression of the voltage U, when the incident light power is 0.02 milliwatt, the output voltage of the photoelectric detector is about 1 volt and is at an ideal working voltage only by setting the bias voltage of the electro-optical modulation crystal to be equal to 0 volt; when the incident light power is 1 milliwatt, the output voltage of the photoelectric detector is 1 volt and is also at the ideal working voltage only by setting the bias voltage of the electro-optic modulation crystal to be equal to 5 volts.
Therefore, when the incident light power changes, the bias voltage of the electro-optical modulation crystal is adjusted through the feedback circuit, so that the voltage of the communication electric signal output by the electro-optical detector can be in an ideal working voltage, and the receiver can work in an optimal working state.
Based on the same invention concept, the embodiment of the application also provides an underwater large dynamic blue-green laser communication receiving device based on polarization interference, and the device is applied to underwater communication equipment; in particular, the method is applied to a receiver of the underwater communication equipment, namely the underwater communication receiver. As shown in fig. 2, the apparatus may include: a receiving module 21, a polarization interference module 22, a photodetector 23 and a feedback circuit 24.
The receiving module 21 is used for receiving the communication optical signal underwater; the carrier wave of the communication optical signal is a blue-green laser signal.
Here, regarding the specific structure of the receiving module 21, the point of the invention not in the embodiment of the present application may be referred to the corresponding module of the underwater communication receiver in the related art.
The polarization interference module 22 is configured to control the optical power of the communication optical signal by applying a control voltage to the polarization interference module, so that the optical power of the communication optical signal after passing through the polarization interference module is within a preset recommended working range of the photodetector 23.
Here, the control voltage applied to the polarization interference module is generated by monitoring the amplitude of the communication electrical signal output from the photodetector 23 in real time by the feedback circuit 24 and based on the amplitude. Here, the communication electrical signal is a communication electrical signal corresponding to the communication optical signal received by the receiving module 21.
For clarity of the scheme and layout, the specific structure of the polarization interference module 22 will be illustrated later.
And the photodetector 23 is configured to perform photoelectric detection on the communication optical signal passing through the polarization interference module 22, and output a communication electrical signal corresponding to the communication optical signal.
Wherein, the photoelectric detector can adopt an avalanche photodiode or a photomultiplier to adapt to underwater communication equipment with smaller sealing volume.
Regarding the specific implementation manner of the photoelectric detector for performing photoelectric detection on the communication optical signal, the principles and implementation manners of photoelectric detection in related technologies can be referred to, which is not the invention point of the embodiment of the present application, and the embodiment of the present application is not described in detail.
It is understood that after the communication optical signal is converted into the communication electrical signal, the communication electrical signal may be further processed, such as demodulated, outputted, and so on.
And a feedback circuit 24 for monitoring the amplitude of the communication electrical signal output by the photodetector 23 in real time and generating the control voltage according to the amplitude.
Here, the feedback circuit 24 may be specifically constructed by using an FPGA and a peripheral hardware circuit of the FPGA.
It is to be understood that the arrow direction in fig. 2 represents the light path traveling direction.
Next, a specific structure of the polarization interference module 22 will be described by way of example. Illustratively, the polarization interference module may include a polarizer, an electro-optic modulation crystal and an analyzer arranged in sequence along the traveling direction of the optical path; the polarizing direction of the polarizer is the same as that of the analyzer; the control voltage is a bias voltage applied to the electro-optic modulation crystal. Therefore, the structure of the underwater large dynamic blue-green laser communication receiving device based on polarization interference provided by the embodiment of the application can be seen in fig. 3.
In fig. 3, a polarizer 2201 is used for converting the communication optical signal into a linearly polarized optical signal.
And the electro-optical modulation crystal 2202 is used for adjusting the polarization state of the polarized optical signal by a bias voltage applied to the electro-optical modulation crystal, so that the polarized optical signal with the adjusted polarization state becomes a communication optical signal with optical power within the recommended working range of the photoelectric detector 23 after passing through the analyzer 2203.
It will be appreciated that changing the bias voltage applied to the electro-optic modulation crystal 2202 changes the polarization state of the polarized optical signal passing through the electro-optic modulation crystal 2202. The electro-optical modulation crystal has two orthogonal eigen-polarization modes, and can adjust the polarization state of the polarized light signal, particularly when the bias voltage is changed, the phase delay difference of the optical field components in the directions of the two eigen-polarization modes during the transmission of the polarized light signal is changed.
After the polarization state of the polarized light signal is changed, the light power of the polarized light signal passing through the polarizer is correspondingly changed; therefore, the electro-optical modulation crystal is given a proper bias voltage, and a communication optical signal with optical power within the recommended working range of the photoelectric detector can be obtained after the analyzer.
In order to reduce the sealing volume of the underwater communication equipment, the polarizer and the analyzer can adopt a space type polaroid with the extinction ratio of more than 10 dB; the space-type polarization device is different from the polarization devices in the forms of optical waveguides and optical fibers, and the sealing volume of the underwater communication equipment can be effectively reduced without adding an additional optical coupling device. Therefore, compared with the mode that a mechanical variable attenuator is arranged in front of a photoelectric detector in the related art, the polarized light interference module adopted by the embodiment of the application has a small volume and is suitable for sealing underwater communication equipment with a small volume.
Optionally, in order to improve the optical signal transmission effect of the polarizer and the electro-optic modulation crystal, an included angle between the polarization direction of the polarizer and the intrinsic polarization direction of the electro-optic modulation crystal may be set to 45 °; correspondingly, the included angle between the polarization direction of the analyzer and the intrinsic polarization direction of the electro-optic modulation crystal is also 45 degrees.
In addition, when the underwater communication receiver is required to have a large receiving dynamic range, the underwater large dynamic blue-green laser communication receiving device based on the polarized light interference provided by the embodiment of the application can adopt a plurality of polarized light interference modules which can be connected in series; therefore, the underwater communication receiver can obtain a larger receiving dynamic range.
In the underwater large dynamic blue-green laser communication receiving device based on polarized light interference, the control voltage loaded on the polarized light interference module is controlled through a feedback module, so that the light power of a communication light signal is controlled; the feedback module monitors the amplitude of the communication electric signal output by the photoelectric detector in real time and generates control voltage according to the amplitude, so that the optical power of the communication optical signal output by the polarized light interference module can be adjusted to be within the recommended working range of the photoelectric detector by giving the polarized light interference module proper control voltage to any communication optical signal with different optical power; therefore, the underwater communication receiver can have a large receiving dynamic range; and because the polarized light interference module is a photoelectric device, the response speed to the communication optical signal is high, so that the embodiment of the application can enable the underwater communication receiver to have a large receiving dynamic range, and improve the self-adaptive capacity of the receiver to the communication optical signal power.
In addition, the application opens up the new application of the polarized light interference module, namely the polarized light interference module is applied to improving the receiving dynamic range of the underwater communication receiver.
It should be noted that, for the apparatus embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to part of the description of the method embodiment.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
While the present application has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
The foregoing is a more detailed description of the present application in connection with specific preferred embodiments and it is not intended that the present application be limited to these specific details. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (10)
1. The utility model provides a big dynamic blue-green laser communication receiving method under water based on polarization interference which characterized in that includes:
receiving a communication optical signal underwater; the carrier wave of the communication optical signal is a blue-green laser signal;
controlling the optical power of the communication optical signal by using a polarized light interference module so that the optical power of the communication optical signal after passing through the polarized light interference module is within a preset recommended working range of the photoelectric detector;
performing photoelectric detection on the communication optical signal passing through the polarization interference module by using the photoelectric detector, and outputting a communication electrical signal corresponding to the communication optical signal;
the polarized light interference module controls the optical power of the communication optical signal by loading control voltage to the polarized light interference module; the control voltage is generated by monitoring the amplitude of the communication electric signal in real time through a feedback circuit according to the amplitude.
2. The method according to claim 1, wherein the polarization interference module comprises a polarizer, an electro-optic modulation crystal and an analyzer arranged in sequence along the traveling direction of the optical path;
the utilizing the polarized light interference module to control the optical power of the communication optical signal, so that the optical power of the communication optical signal passing through the polarized light interference module is within a preset recommended working range of the photoelectric detector, and the method comprises the following steps:
converting the communication optical signal into a linearly polarized optical signal by using the polarizer;
adjusting the polarization state of the polarized light signal by using an electro-optical modulation crystal, and enabling the polarized light signal with the adjusted polarization state to pass through the analyzer to obtain a communication light signal with the light power within the recommended working range of the photoelectric detector;
wherein the polarizing direction of the polarizer is the same as that of the analyzer; the control voltage is a bias voltage loaded on the electro-optic modulation crystal.
3. A method according to claim 2, wherein the polarizer has a polarization direction that is at an angle of 45 ° to the intrinsic polarization direction of the electro-optic modulating crystal.
4. The method of claim 2, wherein the polarizer and the analyzer are both spatial polarizers with extinction ratios above 10 dB.
5. The method of claim 1, wherein the polarization interference modules comprise multiple groups, and the multiple groups of polarization interference modules are connected in series along a direction of travel of the optical path.
6. The utility model provides a big developments blue-green laser communication receiving arrangement under water based on polarization is interfered which characterized in that includes:
the receiving module is used for receiving the communication optical signal underwater; the carrier wave of the communication optical signal is a blue-green laser signal;
the polarized light interference module is used for controlling the optical power of the communication optical signal through the control voltage loaded to the polarized light interference module, so that the optical power of the communication optical signal after passing through the polarized light interference module is within a preset recommended working range of the photoelectric detector;
the photoelectric detector is used for performing photoelectric detection on the communication optical signal after passing through the polarization interference module and outputting a communication electric signal corresponding to the communication optical signal;
and the feedback circuit is used for monitoring the amplitude of the communication electric signal in real time and generating the control voltage according to the amplitude.
7. The device according to claim 6, wherein the polarization interference module comprises a polarizer, an electro-optic modulation crystal and an analyzer which are arranged in sequence along the traveling direction of the optical path; the polarizing direction of the polarizer is the same as that of the analyzer; the control voltage is a bias voltage loaded on the electro-optic modulation crystal;
the polarizer is used for converting the communication optical signal into a linearly polarized optical signal;
the electro-optical modulation crystal is used for adjusting the polarization state of the polarized light signal by the bias voltage loaded to the electro-optical modulation crystal, so that the polarized light signal with the adjusted polarization state becomes a communication light signal with the light power within the recommended working range of the photoelectric detector after passing through the analyzer.
8. The apparatus of claim 7, wherein the polarizer has a polarization direction that is 45 ° from the intrinsic polarization direction of the electro-optic modulating crystal.
9. The apparatus of claim 7, wherein the polarizer and the analyzer are both spatial polarizers with extinction ratio above 10 dB.
10. The apparatus of claim 6, wherein the polarization interference modules comprise a plurality of groups, and the plurality of groups of polarization interference modules are connected in series along a direction of travel of the optical path.
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