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System and method for detecting laser based on micro-nano Er-doped fiber

A technology of erbium-doped optical fiber and micro-nano optical fiber, applied in the direction of color/spectral characteristic measurement, instrument, measuring device, etc., to achieve the effect of simple packaging structure design, high sensitivity, and large dynamic range

Active Publication Date: 2016-06-22
JINAN RICHNES ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In short, the existing gas detection cannot meet the current needs in terms of sensitivity, speed and stability. Therefore, a new active gas detection system is urgently needed

Method used

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  • System and method for detecting laser based on micro-nano Er-doped fiber
  • System and method for detecting laser based on micro-nano Er-doped fiber
  • System and method for detecting laser based on micro-nano Er-doped fiber

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Embodiment 1

[0038] Embodiment 1 of the present invention such as image 3 As shown, an Er-doped 3+ Active gas detection system with evanescent field characteristics of micro-nano fiber, including 980nm pump light source (LD)3, wavelength division multiplexer (WDM)2, isolator (ISO)4, packaged DBR-MFL1, and gas processing unit. The 980nm pump light source 3 is connected to the 980nm input end of the wavelength division multiplexer (WDM) 2 through its pigtail; the common end of the wavelength division multiplexer (WDM) 2 is connected to the pigtail of the packaged DBR-MFL1; The 1550nm end of the wavelength division multiplexer (WDM) 2 is connected to the positive input of the isolator (ISO) 4, and the other end of the isolator (ISO) 4 is connected to the gas processing unit; the gas processing unit includes a photodetector 5, Lock-in amplifier 6 and field programmable logic gate array (FPGA) processor 7, wherein the input end of photodetector 5 is connected with isolator (ISO) 4, the outpu...

Embodiment 2

[0047] Embodiment 2: Same as real-time example 1, except that the gas to be measured is ammonia, and the output laser wavelength of the DBR-MFL is 1544nm.

Embodiment 3

[0048] Embodiment 3: Same as real-time example 1, except that the gas to be measured is carbon monoxide, and the output laser wavelength of DBR-MFL is 1567nm.

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Abstract

The invention discloses a system and a method for detecting a laser based on a micro-nano Er-doped fiber. The laser is a distributed Bragg reflector-micro-nanofiber laser and comprises an Er-doped micro-nanofiber serving as an active medium and SMF (single mode fiber)-engraved Bragg gratings serving as resonant cavities; the Er-doped micro-nanofiber is formed by drawing a piece of Er-doped block glass with a direct drawing method by the aid of sapphire fibers; two sections of selected SMFs are written with a method for irradiating a phase mask plate through ultraviolet light, Bragg gratings are formed respectively, and the lengths of tail fibers of two ends of each Bragg grating are not equal. The strong evanescent field of the micro-nanofiber is placed in a resonant cavity of the fiber laser, the detection sensitivity can be improved by several orders of magnitudes, and integration of laser output and sensing is realized.

Description

technical field [0001] The invention relates to the technical field of optical fiber laser sensing and detection, in particular to a detection system and method for a laser based on a micro-nano erbium-doped optical fiber. Background technique [0002] How to accurately and quickly detect toxic, harmful, flammable and explosive gases in industrial and agricultural production and in daily life has become one of the important problems that need to be solved urgently. The content of these gas components may be on the order of one part per million or less, and a highly sensitive gas detection device is required for these trace gases. Fiber-optic gas sensors have attracted more and more attention from researchers for their advantages of intrinsic safety, anti-electromagnetic interference, high temperature and high pressure resistance, and easy remote transmission and multiplexing. The evanescent field optical fiber gas sensor is a new type of sensor that uses the interaction bet...

Claims

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Application Information

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IPC IPC(8): G01N21/39
CPCG01N21/39G01N2021/396
Inventor 朱存光王朋朋王仁德王光伟陶雪辰郑志丽孟双双崔婷婷
Owner JINAN RICHNES ELECTRONICS CO LTD
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