CN216649695U - Laser communication device in atmospheric turbulence - Google Patents

Laser communication device in atmospheric turbulence Download PDF

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CN216649695U
CN216649695U CN202220134951.8U CN202220134951U CN216649695U CN 216649695 U CN216649695 U CN 216649695U CN 202220134951 U CN202220134951 U CN 202220134951U CN 216649695 U CN216649695 U CN 216649695U
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bias voltage
unit
reverse bias
laser
communication
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李洋
赵馨
王潼
张雷
庄增钰
栾雨生
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Changchun University of Science and Technology
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Changchun University of Science and Technology
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The utility model discloses a laser communication device in atmospheric turbulence, which comprises a digital signal input end, a modulator, a laser, an emitting optical antenna, a receiving optical antenna, an avalanche photodiode, an optimal reverse bias voltage output unit, a communication signal demodulation unit and a data output end. The optimal reverse bias voltage is calculated through the optimal reverse bias voltage output unit, and the communication signal is demodulated through the communication signal demodulation unit and transmitted to the data output end, so that the negative effect of the atmospheric turbulence effect on the communication performance of the laser communication system is relieved. The data transmission in the atmospheric channel realizes better communication effect, and has the outstanding characteristics of simple structure, good real-time performance, improvement of communication system performance and the like.

Description

Laser communication device in atmospheric turbulence
Technical Field
The utility model belongs to the field of laser communication, and particularly relates to a laser communication device in atmospheric turbulence.
Background
In the near-ground atmospheric channel, the atmospheric turbulence phenomenon is serious, the atmospheric channel is the main reason for limiting the near-ground laser communication high-speed data transmission, and the atmospheric turbulence causes the power fluctuation of laser signals, so that the receiving signal-to-noise ratio is reduced, and the system bit error rate is increased. At present, the influence of atmospheric turbulence on laser communication is relieved, the distortion of light beams is mainly corrected at a receiving end through adaptive optics, but the system is not popularized due to the complex structure, high cost, unobvious improvement effect on the performance of high-speed laser communication and the like.
It is obvious that different turbulence intensities can attenuate the intensity of a light beam to different degrees, a receiving end can not increase the internal gain of the avalanche photodiode without limit to increase the receiving signal-to-noise ratio, the excessive increase of the internal gain can seriously increase the noise of a detector to reduce the receiving signal-to-noise ratio, and the too low internal gain can submerge the received photocurrent in the noise of the detector to be difficult to demodulate correct transmission information.
Disclosure of Invention
The utility model provides a laser communication device in atmospheric turbulence, aiming at the problem that a communication link is unstable due to misjudgment in the demodulation of the atmospheric turbulence in the prior art.
In order to achieve the technical purpose, the technical scheme adopted by the utility model is as follows:
a laser communication device in atmospheric turbulence comprises a digital signal input end, a modulator, a laser, a transmitting optical antenna, a receiving optical antenna, an avalanche photodiode, an optimal reverse bias voltage output unit, a communication signal demodulation unit and a data output end;
the digital signal input end, the modulator, the laser and the transmitting optical antenna are sequentially in communication connection, signals are sent to the modulator through the digital signal input end, the modulator loads the signals to the laser, and then the transmitting optical antenna completes the transmitting of the laser;
the receiving optical antenna, the avalanche photodiode and the optimal reverse bias voltage output unit are sequentially in communication connection, laser beams with modulation information are converged onto a target surface of the avalanche photodiode through the receiving optical antenna through an atmospheric channel, and then the laser beams are calculated through the optimal reverse bias voltage output unit and provide real-time optimal reverse bias voltage for the avalanche photodiode;
the avalanche photodiode, the communication signal demodulation unit and the data output end are sequentially in communication connection.
Further, the optimal reverse bias voltage output unit comprises a current mirror, an analog-to-digital conversion unit, an optimal multiplication factor calculation unit, a gain factor and reverse bias voltage comparison unit, a PID control unit and a DC/DC converter;
the avalanche photodiode, the current mirror, the analog-to-digital conversion unit, the optimal multiplication factor calculation unit and the gain factor and reverse bias voltage comparison unit are sequentially in communication connection, the current mirror, the analog-to-digital conversion unit, the optimal multiplication factor calculation unit and the gain factor and reverse bias voltage comparison unit are used for calculating an optimal multiplication factor value after analog-to-digital conversion, and the optimal reverse bias voltage is calculated through comparison of the multiplication factor and the reverse bias voltage;
the gain factor is sequentially in communication connection with the reverse bias voltage comparison unit, the PID control unit, the DC/DC converter and the avalanche photodiode, and real-time optimal reverse bias voltage is provided for the avalanche photodiode by the PID control algorithm with the DC/DC converter as an execution device.
Further, the communication signal demodulation unit comprises a transimpedance gain amplifier and a clock data recovery unit;
the avalanche photodiode, the transimpedance gain amplifier, the clock data recovery unit and the data output end are sequentially in communication connection.
Compared with the prior art, the utility model has the following beneficial effects:
the optimal reverse bias voltage is calculated through the optimal reverse bias voltage output unit, and the communication signal is demodulated through the communication signal demodulation unit and transmitted to the data output end, so that the negative effect of the atmospheric turbulence effect on the communication performance of the laser communication system is relieved. The data transmission in the atmospheric channel realizes better communication effect, and has the outstanding characteristics of simple structure, good real-time performance, improvement of communication system performance and the like.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a laser communication device in atmospheric turbulence according to the present invention;
FIG. 2 is a circuit diagram of a digital-to-analog conversion unit according to the present invention;
FIG. 3 is a pin circuit diagram of the optimal multiplication factor calculation unit of the present invention operating within an FPGA;
FIG. 4 is a pin circuit diagram of the gain factor and back-bias voltage comparison unit of the present invention operating within an FPGA;
FIG. 5 is a control circuit diagram of a PID control unit according to the utility model;
FIG. 6 is a circuit diagram of the input/output control circuit of the PID control unit in FIG. 5;
FIG. 7 is a circuit diagram of a clock data recovery unit according to the present invention.
The notation in the figure is: the device comprises a 1-transmitting optical antenna, a 2-laser, a 3-modulator, a 4-digital signal input end, a 5-receiving optical antenna, a 6-avalanche photodiode, a 7-current mirror, an 8-analog-to-digital conversion unit, a 9-optimal multiplication factor calculation unit, a 10-gain factor and reverse bias voltage comparison unit, an 11-PID control unit, a 12-DC/DC converter, a 13-transimpedance gain amplifier, a 14-clock data recovery unit and a 15-data output end.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.
As shown in fig. 1 to 7, a laser communication device in atmospheric turbulence comprises a digital signal input terminal 4, a modulator 3, a laser 2, a transmitting optical antenna 1, a receiving optical antenna 5, an avalanche photodiode 6, an optimum reverse bias voltage output unit, a communication signal demodulation unit, and a data output terminal 15. The laser 2 is OTX-15-155M-MB, the analog-to-digital conversion unit 8 is AD9226ARS, the avalanche photodiode 6 is Voxtel Siletz BSI RIP1-JJRC series, the clock data recovery unit 14 is an ADN2814 type device, and the DC/DC converter 12 is MAX15031boost converter. The communication connection mode described in this embodiment is a cable or optical fiber connection.
The digital signal input end 4, the modulator 3, the laser 2 and the transmitting optical antenna 1 are sequentially in communication connection, signals are sent to the modulator 3 through the digital signal input end 4, the modulator 3 loads the signals to the laser 2, and then the transmitting optical antenna 1 is used for completing the transmitting of the lasers.
The receiving optical antenna 5, the avalanche photodiode 6 and the optimal reverse bias voltage output unit are sequentially in communication connection, laser beams with modulation information are converged to the target surface of the avalanche photodiode 6 through the receiving optical antenna 5 through an atmospheric channel, and the laser beams are calculated through the optimal reverse bias voltage output unit and provide real-time optimal reverse bias voltage for the avalanche photodiode 6;
the avalanche photodiode 6, the communication signal demodulation unit and the data output terminal 15 are in communication connection in sequence.
The optimal reverse bias voltage output unit comprises a current mirror 7, an analog-to-digital conversion unit 8, an optimal multiplication factor calculation unit 9, a gain factor and reverse bias voltage comparison unit 10, a PID control unit 11 and a DC/DC converter 12.
The avalanche photodiode 6, the current mirror 7, the analog-to-digital conversion unit 8, the optimal multiplication factor calculation unit 9 and the gain factor and reverse bias voltage comparison unit 10 are sequentially connected in a communication mode, the current mirror 7, the analog-to-digital conversion unit 8, the optimal multiplication factor calculation unit 9 and the gain factor and reverse bias voltage comparison unit 10 are used for calculating an optimal multiplication factor value after analog-to-digital conversion, and the optimal reverse bias voltage is calculated through comparison of the multiplication factor and the reverse bias voltage.
The gain factor is in communication connection with the reverse bias voltage comparison unit 10, the PID control unit 11, the DC/DC converter 12 and the avalanche photodiode 6 in sequence, and real-time optimal reverse bias voltage is provided for the avalanche photodiode 6 by a PID control algorithm with the DC/DC converter 12 as an execution device.
The communication signal demodulation unit comprises a transimpedance gain amplifier 13 and a clock data recovery unit 14; the avalanche photodiode 6, the transimpedance gain amplifier 13, the clock data recovery unit 14 and the data output terminal 15 are sequentially connected in communication.
The use principle of the utility model lies in that (1) the whole device is powered on to make each part in working state, the receiving optical antenna 5 collects the background light to the target surface of the avalanche photodiode 6, the photocurrent converted by the avalanche photodiode 6 is converted into digital signal by the analog-to-digital conversion unit 8 and stored in the optimal multiplication factor calculation unit 9.
(2) Binary data at a data input end is loaded on a laser 2 through a modulator 3, the laser 2 converts an electric signal into an optical signal, and the transmitting optical antenna 1 completes the transmission of a laser beam.
(3) The laser beam passes through an atmospheric channel, the receiving optical antenna 5 converges the light beam to the target surface of the avalanche photodiode 6, and the avalanche photodiode 6 converts the modulated optical signal into an electrical signal.
(4) The anode of the avalanche photodiode 6 is connected with a transimpedance gain amplifier 13 for demodulation of the signal, and the cathode of the avalanche photodiode 6 is connected with a current mirror 7 for providing a photocurrent value affected by turbulence for multiplication factor calculation.
(5) The transimpedance gain amplifier 13 amplifies the signal, and the amplified signal completes clock and data recovery of modulation data through the clock recovery unit and is output through the data output end 15.
(6) The current mirror 7 is used for measuring the photocurrent of the avalanche photodiode 6 in a mirror image mode, and an analog signal is converted into a digital signal through the analog-to-digital conversion unit 8 so as to be convenient to process.
(7) The converted digital signal is processed by an optimal multiplication factor calculation unit 9 according to a receiving signal-to-noise ratio formula of the avalanche photodiode 6, namely, a ratio of useful signal power to noise power, wherein the useful signal power is composed of a product of useful signal photocurrent and a multiplication factor, the noise power is composed of shot noise and thermal noise caused by background light and dark current, other parameters except the multiplication factor are constant values within a certain time, the formula obtained by performing derivation of the multiplication factor on the receiving signal-to-noise ratio formula of the avalanche photodiode 6 is increased and then decreased along with the continuous increase of the multiplication factor, namely, the multiplication factor is an optimal multiplication factor point when the derivation of the multiplication factor is zero by the receiving signal-to-noise ratio formula of the avalanche photodiode 6, and an optimal reverse bias voltage value is output by a gain factor and reverse bias voltage comparison unit 10.
(8) The gain factor and the output value of the reverse bias voltage comparison unit 10 are used as the input value of the PID control unit 11, and the output value of the PID control unit 11 is used as the input control quantity of the DC/DC converter 12.
(9) The output of the DC/DC converter 12 provides the reverse bias voltage and the feedback signal of the PID control unit 11 to the avalanche photodiode 6, respectively.
Compared with the prior art, the utility model has the following beneficial effects:
the optimal reverse bias voltage is calculated through the optimal reverse bias voltage output unit, and the communication signal is demodulated through the communication signal demodulation unit and transmitted to the data output end 15, so that the negative effect of the atmospheric turbulence effect on the communication performance of the laser communication system is relieved. The data transmission in the atmospheric channel realizes better communication effect, and has the outstanding characteristics of simple structure, good real-time performance, improvement of communication system performance and the like.
The laser communication device in the atmosphere turbulence provided by the application is described in detail above. The description of the specific embodiments is provided to facilitate an understanding of the structure and design of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims (3)

1. A laser communication device in atmospheric turbulence is characterized by comprising a digital signal input end (4), a modulator (3), a laser (2), a transmitting optical antenna (1), a receiving optical antenna (5), an avalanche photodiode (6), an optimal reverse bias voltage output unit, a communication signal demodulation unit and a data output end (15);
the digital signal input end (4), the modulator (3), the laser (2) and the transmitting optical antenna (1) are sequentially in communication connection, the digital signal input end (4) sends signals to the modulator (3), the modulator (3) loads the signals to the laser (2), and then the transmitting optical antenna (1) completes the transmitting of the laser;
the receiving optical antenna (5), the avalanche photodiode (6) and the optimal reverse bias voltage output unit are sequentially in communication connection, laser beams with modulation information are converged to the target surface of the avalanche photodiode (6) through the receiving optical antenna (5) through an atmospheric channel, and the laser beams are calculated through the optimal reverse bias voltage output unit and provide real-time optimal reverse bias voltage for the avalanche photodiode (6);
the avalanche photodiode (6), the communication signal demodulation unit and the data output end (15) are sequentially connected in communication.
2. The laser communication device in atmospheric turbulence according to claim 1, characterized in that the optimal reverse bias voltage output unit comprises a current mirror (7), an analog-to-digital conversion unit (8), an optimal multiplication factor calculation unit (9), a gain factor and reverse bias voltage comparison unit (10), a PID control unit (11) and a DC/DC converter (12);
the avalanche photodiode (6), the current mirror (7), the analog-to-digital conversion unit (8), the optimal multiplication factor calculation unit (9) and the gain factor and reverse bias voltage comparison unit (10) are sequentially in communication connection, the current mirror (7), the analog-to-digital conversion unit (8), the optimal multiplication factor calculation unit (9) and the gain factor and reverse bias voltage comparison unit (10) are used for calculating an optimal multiplication factor value after analog-to-digital conversion, and the optimal reverse bias voltage is calculated through comparison of the multiplication factor and the reverse bias voltage;
the gain factor is sequentially connected with a reverse bias voltage comparison unit (10), a PID control unit (11), a DC/DC converter (12) and the avalanche photodiode (6) in a communication mode, and real-time optimal reverse bias voltage is provided for the avalanche photodiode (6) by the DC/DC converter (12) serving as an execution device through a PID control algorithm.
3. The laser communication device in atmospheric turbulence according to claim 1, characterized in that the communication signal demodulation unit includes a transimpedance gain amplifier (13) and a clock data recovery unit (14);
the avalanche photodiode (6), the transimpedance gain amplifier (13), the clock data recovery unit (14) and the data output end (15) are sequentially in communication connection.
CN202220134951.8U 2022-01-19 2022-01-19 Laser communication device in atmospheric turbulence Active CN216649695U (en)

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CN202220134951.8U CN216649695U (en) 2022-01-19 2022-01-19 Laser communication device in atmospheric turbulence

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Application Number Priority Date Filing Date Title
CN202220134951.8U CN216649695U (en) 2022-01-19 2022-01-19 Laser communication device in atmospheric turbulence

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