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Coherent wireless laser communication system, method and receiver based on frequency-stabilized laser

A wireless laser and communication system technology, applied in the field of coherent optical communication, can solve problems such as laser signal synchronization, and achieve the effects of high signal synchronization accuracy and fast signal capture speed

Active Publication Date: 2015-10-28
PEKING UNIV
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Problems solved by technology

[0004] In order to overcome the laser signal synchronization problem under Doppler dynamic conditions, the object of the present invention is to provide a new type of coherent wireless laser communication system and method to quickly capture and track Doppler frequency-shifted laser signals in a fast-changing channel system

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Embodiment Construction

[0025] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] Embodiment of Coherent Wireless Laser Communication System and Receiver

[0027] The coherent wireless laser communication system of this embodiment includes a transmitter and a receiver, and the transmitter structure refers to figure 1 , including a signal source module 110, a modulation module 120, and a first frequency-stabilized laser 130 connected in sequence; the signal source module 110 is used to generate data to be transmitted, and the modulation module 120 is used to modulate the output of the signal source module to the first stable frequency laser. frequency laser 130.

[0028] Receiver structure reference figure 2 , comprising an optical frequency mixing module 140, a coherent demodulation module 150, an A...

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Abstract

The invention discloses a coherent wireless laser communication system and method based on a frequency stabilized laser, and a receiver. The system is characterized in that the frequency stabilized laser is used as a transmission light source and a receiving local oscillation light source for communication, wherein a transmitter comprises an information source module, a modulation module and a first frequency stabilized laser; a receiver comprises an optical mixing module, a coherent demodulation module, an acquisition, pointing and tracking module (APT), a transmitter relative position and speed evaluation module, a receiver Doppler frequency offset evaluation module and a second frequency stabilized laser; and the optical mixing module, the coherent demodulation module and the second frequency stabilized laser are connected with each other in sequence to finish tracking demodulation of a laser signal. By using the invention, the acquisition and tracking of the laser signal can be acquired and tracked under the condition of large optical Doppler frequency shifting state, and high signal acquisition speed and high signal synchronization accuracy are obtained.

Description

technical field [0001] The technical field of coherent optical communication of the present invention relates in particular to a coherent wireless laser communication system, method and receiver based on a frequency-stabilized laser. Background technique [0002] Coherent optical communication requires strict frequency or phase synchronization between the local oscillator laser and the received laser signal. In a wireless laser mobile communication system, such as satellite optical communication, due to the relatively high speed between transceivers, the received laser signal will have a large Doppler frequency deviation and frequency deviation change speed. Doppler frequency shift is a problem that cannot be ignored in wireless laser communication. Since the capture time of the phase-locked loop is proportional to the square of the frequency offset, if the natural capture method is used, when the frequency offset is large, it takes a long time for the phase-locked loop to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/11H04B10/50H04B10/61H04B10/112
Inventor 刘璐周喆颋涂波
Owner PEKING UNIV
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