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A ring-cavity-tuned q-pulse laser based on a chirped phase-shifted fiber grating

A phase-shifted fiber grating and pulsed laser technology, applied in the fields of instrumentation and optical fiber communication, can solve the problems of unstable output power and difficult control of pulsed laser, and achieve the effect of improving system stability, power stability and system stability.

Inactive Publication Date: 2019-10-22
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When making Q-switched pulsed lasers based on fiber Bragg gratings using schemes two and three, it is necessary to fix the fiber grating used as a frequency selector or other types of filters to fix its resonant wavelength, and then make the magnetostrictive rod or pressure The electroceramic acts on the reflective grating, and periodically adjusts its resonant wavelength to align with the frequency-selective grating to generate laser pulses. However, due to the characteristics of the magnetostrictive rod or the piezoelectric ceramic material itself, it is difficult to control each alignment. Pulse laser output power is unstable

Method used

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  • A ring-cavity-tuned q-pulse laser based on a chirped phase-shifted fiber grating
  • A ring-cavity-tuned q-pulse laser based on a chirped phase-shifted fiber grating
  • A ring-cavity-tuned q-pulse laser based on a chirped phase-shifted fiber grating

Examples

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Effect test

Embodiment 1

[0024] A ring-cavity Q-switched pulsed laser based on a chirped phase-shifting fiber grating, such as figure 1 As shown, it is characterized in that: the Q-switched pulsed laser includes a pump light source 101, a wavelength division multiplexer 102, a length of 2 meters doped optical fiber 103, an optical isolator 104, a polarizer 105, a polarization controller 106, Linear chirped fiber grating 107, stacked piezoelectric ceramics 108, electrical signal generator 109, optical circulator 110, uniform fiber Bragg grating 111 with a reflectivity of 99%, optical fiber 90:10 coupler 112; the specific link method is:

[0025] The pump light source 101 is connected to the first port 1021 on the left side of the wavelength division multiplexer 102, and the port 1022 on the right side of the wavelength division multiplexer 102 is connected to one end of a doped optical fiber 103 with a length of 2 meters. The other end of the miscellaneous fiber 103 is connected to one end of the optic...

Embodiment 2

[0032] A ring-cavity Q-switched pulsed laser based on a chirped phase-shifting fiber grating, such as figure 1 As shown, it is characterized in that: the Q-switched pulsed laser includes a pump light source 101, a wavelength division multiplexer 102, a length of 2 meters doped optical fiber 103, an optical isolator 104, a polarizer 105, a polarization controller 106, Linear chirped fiber grating 107, stacked piezoelectric ceramics 108, electrical signal generator 109, optical circulator 110, uniform fiber Bragg grating 111 with a reflectivity of 99%, optical fiber 90:10 coupler 112; the specific link method is:

[0033] The pump light source 101 is connected to the first port 1021 on the left side of the wavelength division multiplexer 102, and the port 1022 on the right side of the wavelength division multiplexer 102 is connected to one end of a doped optical fiber 103 with a length of 2 meters. The other end of the miscellaneous fiber 103 is connected to one end of the optic...

Embodiment 3

[0040] A ring-cavity Q-switched pulsed laser based on a chirped phase-shifting fiber grating, such as figure 1 As shown, it is characterized in that: the Q-switched pulsed laser includes a pump light source 101, a wavelength division multiplexer 102, a length of 2 meters doped optical fiber 103, an optical isolator 104, a polarizer 105, a polarization controller 106, Linear chirped fiber grating 107, stacked piezoelectric ceramics 108, electrical signal generator 109, optical circulator 110, uniform fiber Bragg grating 111 with a reflectivity of 99%, optical fiber 90:10 coupler 112; the specific link method is:

[0041] The pump light source 101 is connected to the first port 1021 on the left side of the wavelength division multiplexer 102, and the port 1022 on the right side of the wavelength division multiplexer 102 is connected to one end of a doped optical fiber 103 with a length of 2 meters. The other end of the miscellaneous fiber 103 is connected to one end of the optic...

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Abstract

The invention provides a fiber bragg grating-based ring cavity Q-switched pulse laser, and belongs to the fields of optical fiber communication and instruments and meters. A pump light source (101) firstly enters a laser ring cavity structure through a wavelength division multiplexer (102), is gained through a doped fiber (103) which is 2m long, passes through a photoisolator (104), a polarizer (105) and a polarization controller (106) and then passes through a piezoelectric ceramic-based chirped and phase-shifted fiber bragg grating type filter comprising a linear chirped fiber bragg grating (107), a piezoelectric ceramic (108) and an electric signal generator (109). A signal within a bandwidth range returns to the inside of a laser resonant cavity through reflection of a circulator (110) and a uniform fiber bragg grating (111); and finally a laser pulse is output from a coupler (12). The Q-switched pulse laser is achieved mainly by periodically introducing a phase shift to the linear chirped fiber bragg grating (107) through an AC signal generated by the electric signal generator (109). The pulse laser lights with different repetition frequencies can be obtained by changing the frequency of the AC signal.

Description

technical field [0001] The invention relates to the fields of optical fiber communication and instrumentation, in particular to a ring-cavity Q-switched pulse laser based on a chirped phase-shifting fiber grating. Background technique [0002] Since the first fiber grating came out in 1978, fiber grating has been used in various fields of communication due to its superior performance and flexible design. In particular, fiber gratings have two obvious advantages of narrow bandwidth and high reflectivity, which determine the application of fiber gratings in laser resonators, while Q-switched pulsed lasers based on fiber gratings have simple structure, high repetition rate, low insertion loss, Therefore, research on Q-switched pulsed lasers based on fiber gratings has attracted more and more attention from scholars at home and abroad. [0003] When fiber gratings are applied to Q-switched pulsed lasers, external devices for external modulation of fiber gratings are commonly us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/067H01S3/11
Inventor 吴良英裴丽王建帅
Owner BEIJING JIAOTONG UNIV