Laser & Optoelectronics Progress, Volume. 52, Issue 9, 90603(2015)
Sample-Ring Based APD Gain Adjusting and Temperature Calibrating Raman Fiber Sensing System
A Raman fiber temperature sensing system based on sample-ring aualanche photo diode (APD) gain adjusting and temperature calibrating method is proposed and experimentally demonstrated. The proposed system controls the APD bias by comparing the deviation of signal line and baseline obtained from the sample- ring, maintaining a substantially constant APD gain, thus ensuring temperature measurement accuracy and signal to noise ratio. Signal line obtained from the sample-ring is also used as reference signal for temperature calibration, further eliminating measured errors caused by inevitable APD gain fluctuation due to uncertain factors. Experimental results show that the proposed method significantly improves system performs in signal to noise ratio, stability and temperature measurement accuracy with respect to conventional Raman fiber temperature sensing system, it has practical value.
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Yu Chaoqun, Chen Fuchang, Zhang Hualin, Zhou Jinrong. Sample-Ring Based APD Gain Adjusting and Temperature Calibrating Raman Fiber Sensing System[J]. Laser & Optoelectronics Progress, 2015, 52(9): 90603
Category: Fiber Optics and Optical Communications
Received: Jan. 25, 2015
Accepted: --
Published Online: Aug. 28, 2015
The Author Email: Chaoqun Yu (yucq411@163.com)