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
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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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