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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Research on the Gain Saturation Induced Noise in an Optical Fiber Sensing System
摘要： In an optical fiber sensing time division multiplexing (TDM) system, when the optical pulse with high peak power and low repetition rates is boost amplified, it is prone to be gain saturation and pulse distortion. The paper analysed their effects on the intensity and phase noises, and the results show that the pulse distortion induced noise is mainly down-converted relative intensity noise (RIN) lines spectra caused by the gain jitter. Then the RIN lines are converted into corresponding phase noise lines by the interferometer, which finally cause false signals in the sensor system. However in the case of saturated gain and pulse distortion, the increase of noise background is insignificant. Basing on the above results, several noise suppression schemes have been proposed, which will provide guidance for the design of large-scale remote sensing systems in the future.
关键词： Pulse distortion,Gain saturation,Relative intensity noise,Phase noise,Optical fiber sensor
更新于2025-09-16 10:30:52
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Frequency-Modulated Pulse-Amplification Method for Reducing Pulse Shape Distortion
摘要： To reduce the laser pulse shape distortion accompanying the ampli?cation process and achieve an intended output pulse shape in the Nd:YAG ampli?er chain, we propose a frequency-modulated pulse-ampli?cation method. Assuming carrier-frequency-modulated seed pulses, we numerically simulate the pulse ampli?cation in an Nd:YAG ampli?er chain where severe distortion occurs. For the calculation, we develop a modi?ed Frantz-Nodvik equation, which enables two inputs with di?erent carrier frequencies. The simulation results indicate that the temporal contrast of the seed pulse needed to obtain a ?at output pulse shape is reduced by 16 - 25 dB when frequency modulation is applied.
关键词： Nd:YAG,Pulse shaping,Pulse distortion,Frequency modulation
更新于2025-09-04 15:30:14