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

Inactive Publication Date: 2021-08-20
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, phase encoding is mainly implemented by electro-optic modulation, which will introduce a certain phase error. In order to eliminate the impact of this error on imaging, this patent designs a coherent lidar system based on optical phase-locking

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Coherent laser radar system based on optical phase locking
  • Coherent laser radar system based on optical phase locking
  • Coherent laser radar system based on optical phase locking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0055] The specific implementation of the coherent lidar system based on optical phase-locked pulse code is as follows. The system mainly consists of a frequency sweep modulation module, a composite optical phase lock module and a transceiver module. The system consists of a narrow linewidth laser, an arbitrary waveform generator, an electro-optic phase modulator, the first acousto-optic frequency shifter, an erbium-doped fiber amplifier, a transmitting telescope, a receiving telescope, the first IQ mixer, the first balanced detector, Data acquisition card, second IQ mixer, second balance detector, phase detector, low-pass filter, phase-locked loop controller, voltage-controlled oscillator, second acousto-optic frequency shifter, radio frequency signal transmitting module .

[0056] Among them, the narrow linewidth laser is a semiconductor laser with a wavelength of 1550nm, a linewidth of 1KHz, and an output power of 13dbm. The laser signal is first divided into two paths th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
wavelengthaaaaaaaaaa
poweraaaaaaaaaa
Login to view more

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.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/89
CPCG01S17/89
Inventor 徐卫明胡恒方付平舒嵘鄢朋朋李兆洋
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap