Optical phase lock-based pulse laser zero-difference coherent detection device

A pulsed laser and detection device technology, applied in laser components, lasers, optics, etc., can solve the problem of limiting the signal-to-noise ratio of the system, and achieve the effects of high coherence efficiency, high sensitivity, and high coherence detection

Active Publication Date: 2018-04-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] The purpose of the present invention is to study and design a pulsed laser homodyne coherent detection device based on optical phase-locking for the defect that the detection effective noise bandwidth is wider than the pulse spectrum in the background technology and limits the signal-to-noise ratio of the system

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Embodiment

[0026] figure 1 It is a structural schematic diagram of the device of the present invention, including a continuous laser 1, a pulsed laser 6, a 90° optical mixer 2, a first balanced detector 4, a second balanced detector 5, a loop filter and an electro-optic driver 3, and a polarization beam splitter 7. λ / 4 wave plate 8, optical beam expander system 9, target 10 and signal processing module 11; wherein, continuous laser 1, 90° optical mixer 2, first balance detector 4, loop filter and electro-optic driver 3 constitutes the pulsed laser phase-locked loop I, and the polarization beam splitter 7, the λ / 4 wave plate 8, the optical beam expander system 9 and the target 10 constitute the pulse transmitting / receiving system II.

[0027] CW laser 1 outputs single-frequency linearly polarized laser as local oscillator laser, which is transmitted to the local oscillator light input port of 90° optical mixer 2 through optical fiber; pulsed laser 6 outputs single-frequency linearly polar...

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Abstract

The invention relates to an optical phase lock-based pulse laser zero-difference coherent detection device and relates to a laser coherent detection device in the technical field of optoelectronics. According to the coherent detection device, after the local oscillator laser and the pulse echo signal laser are input into a 90-degree optical mixer, four paths of coherent optical signals with the phase difference of 0 degree, 90 degrees, 180 degrees and 270 degrees are outputted. Among the four paths of coherent optical signals, two paths of optical signals with the phase difference therebetweento be 0 degree and 180 degrees are outputted through an in-phase branch circuit and then are inputted into a laser phase-locked loop through the 4-photoelectric conversion of a first balance detector. In this way, the phase locking of the pulse signal laser and the continuous local oscillator laser is realized. The other two paths of optical signals with the phase difference therebetween to be 90degree and 270 degrees are outputted through an orthogonal branch circuit, and then pulse laser signals can be completely recovered after the photoelectric conversion of the signals through a secondbalance detector. According to the pulse spectrum width of the pulse signal laser, a corresponding narrow-band detector is selected for receiving signals. Therefore, high-sensitivity detection signalscan be obtained.

Description

technical field [0001] The invention relates to a laser coherent detection device in the field of optoelectronic technology, in particular to a pulsed laser homodyne coherent detection device based on optical phase-locking. Background technique [0002] Compared with the traditional intensity modulation / direct detection technology (IM / DD), optical coherent detection technology has the advantages of high detection sensitivity, good wavelength selectivity, strong anti-interference ability, and high frequency band utilization. It is used in optical fiber communication, free space ( Including atmospheric, underwater, space, etc.) communications, laser coherent radar, high-precision optical sensing and other fields have broad application prospects and great research value. [0003] In recent years, with the continuous development of pulsed laser frequency stabilization technology, researchers have proposed the use of pulsed frequency stabilized lasers for coherent detection. Ame...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/481G01S7/483G02B27/28H01S3/10H01S3/11
CPCG01S7/481G01S7/483G02B27/283G02B27/286H01S3/10H01S3/10053H01S3/10061H01S3/11
Inventor 王云祥陶阳平刘阳邱琪廖云史双瑾苏君王智勇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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