Coherent laser radar system based on optical phase locking

A laser radar and phase-locking technology, which is applied in the radio wave measurement system, electromagnetic wave re-radiation, and utilization of re-radiation, etc., can solve problems such as phase error, and achieve the effect of eliminating random phase, narrow line width, and good linearity
CN113281778AInactive Publication Date: 2021-08-20SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
Publication Date
2021-08-20
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses a coherent laser radar system based on optical phase locking. The system carries out the large-bandwidth modulation of narrow-linewidth laser through a phase modulator, the photoelectric conversion of modulated signal light and local oscillation light is completed through an IQ mixer and a balance detector, and then the phase discrimination is realized through a multiplier and a low-pass filter. An obtained error signal is fed back to the optical modulator to correct the frequency and phase of the signal light, optical phase locking of the signal light to the local oscillation light is completed, and the signal light after phase locking is subjected to power amplification through the optical amplifier for target detection. The system solves the random phase caused by the modulation process and optical transmission of the coherent laser radar, and can be used for coherent accumulation and imaging of the coherent laser radar.
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Description

technical field

[0001] The invention relates to coherent laser radar technology, in particular to a random phase compensation technology based on optical phase-locked coherent laser radar, which solves the problem of random phase introduced by electro-optical modulators. Background technique

[0002] Low-noise broadband frequency-sweeping laser signals have extremely important application prospects in coherent optical communication, Doppler ranging, and synthetic aperture lidar. At present, there are mainly two systems to realize broadband signals: internal modulation and external modulation. In the internal modulation system, the tunability of the laser is generally obtained by controlling the length of the optical cavity or changing the pump. However, it is not difficult to find from the principle of the laser that the coherence of the laser and its broadband tunability are a pair of contradictory individuals. Coherence requires a long optical cavity, and the optical cavit...

Claims

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