Mr. Zhaohua Meng Profile

Zhaohua Meng

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Proceedings Article | 29 August 2009 Paper

All-fiber double-balanced laser coherent detection system

Zhao-hua Meng, Guang-lie Hong, Rong Shu, Yi-hua Hu

Proceedings Volume 7382, 73822F (2009) https://doi.org/10.1117/12.833597

KEYWORDS: Signal detection, Polarization, Sensors, Fiber optics, Fiber lasers, Heterodyning, Optical amplifiers, Bragg cells, Laser systems engineering, Receivers

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Laser coherent detection makes use of the coherence of laser to pick up weak laser signal by an optical LO (local oscillator) signal. Compared to direct detection, coherent detection has higher sensitivity and could get the frequency difference between incident signal and LO. Traditional coherent detection systems are composed of free space optical components; the systems were complicated and hard to adjust. We built an all-fiber MOPA heterodyne laser detection system by DFB laser, AO frequency Shifter, polarization beam splitters, polarization maintaining couplers and balanced photo receivers. Because the coherence of laser beams is relative to the alignment of polarizations states, our system uses double-balanced structure. The balanced detection structure greatly reduces the relative intensity noise of the LO. In the article, the theory of coherent detection and the double balanced coherent detection are presented; the design of detection electronic circuits is also discussed. The high coherent efficiency of fiber-optic detection system and high sensitivity of coherent detection are proved by experiment. Some problems caused by fiber optics are also introduced.

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