研究目的
Investigating the effects of gain saturation and pulse distortion on the intensity and phase noises in an optical fiber sensing time division multiplexing (TDM) system.
研究成果
The paper analyzed the impact of gain saturation and pulse distortion on the RIN and phase noise of the TDM sensing system. The experimental results show that the pulse distortion induced noise is mainly down-converted intensity noise lines spectra caused by the gain jitter. These noise lines are converted into corresponding phase noise lines by the interferometer, which finally cause false signals in the sensor system. In the case of saturated gain and pulse distortion, the increase of noise background is insignificant. Therefore, in the design of large-scale remote sensing systems, measures should be taken to avoid or reduce the gain saturation.
研究不足
The study focuses on the PMDI optical fiber sensing system and may not be directly applicable to other types of optical fiber sensing systems. The experimental conditions, such as the use of a single frequency narrow line-width semiconductor laser, may limit the generalizability of the findings.
1：Experimental Design and Method Selection:
The study is based on the path-matched differential interferometry (PMDI) optical fiber sensing system. The methodology involves analyzing the effects of gain saturation and pulse distortion on RIN and phase noise.
2：Sample Selection and Data Sources:
The experimental system includes a PMDI and TDM array packaged in a shielding box to suppress external environmental noise. The system uses a single frequency narrow line-width semiconductor laser with a wavelength of 1550nm.
3：List of Experimental Equipment and Materials:
Equipment includes an erbium doped fiber amplifier (EDFA), variable optical attenuators (VOA1 and VOA2), an acoustic optic modulator (AOM), and a phase modulator (PM).
4：Experimental Procedures and Operational Workflow:
The pulsed light from a laser source is launched into the TDM array. After traveling back, the first and the second pulse which have traveled equal length but different paths interfere. The interferometer pulse is detected and converted into a digital signal.
5：Data Analysis Methods:
The phase change information and its corresponding external signals are obtained by the demodulation program in the computer (PC). The RIN and phase noise induced by pulse distortion are tested.
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