Constant peak-power single-frequency linearly-polarized all-fiber laser for coherent detection based on closed-loop feedback technology

Yaqian Ding; Xiang Zhang; Dong Li; Dapeng Wang; Renzhong Zhang; Chengying Song; Haozhao Che; Rui Wang; Baoling Guo; Guanghui Chen

doi:10.1117/12.2199862

15 October 2015 Constant peak-power single-frequency linearly-polarized all-fiber laser for coherent detection based on closed-loop feedback technology

Yaqian Ding, Xiang Zhang, Dong Li, Dapeng Wang, Renzhong Zhang, Chengying Song, Haozhao Che, Rui Wang, Baoling Guo, Guanghui Chen

Author Affiliations +

Proceedings Volume 9674, AOPC 2015: Optical and Optoelectronic Sensing and Imaging Technology; 967424 (2015) https://doi.org/10.1117/12.2199862
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China

Abstract

In this paper, a practical single-frequency high-repetition linearly-polarized eye-safe all-fiber laser with constant peak power is demonstrated. It is based on master-oscillator power amplifier (MOPA) system. A distributed feedback laser diode simulating at 1550nm with narrow linewidth of 2.3 kHz is employed as the seed source. It is modulated to a pulse laser with high repetition of 20 kHz and peak power of 10mW by an acousto-optic modulator (AOM). The pulse width is tunable between 100ns to 400ns. Two-stage cascade amplifier is established, which consists of a pre-amplifier and a power-amplifier. Amplified spontaneous emission (ASE) and stimulated billion scattering are well suppressed by special management. The output peak power of 30W is obtained, which has nearly diffraction-limited beam quality. It operates in linewidth of 1.2MHz, polarization-extinction ratio (PER) of 25dB and signal-to-noise ratio (SNR) of more than 40dB. Gain of the whole amplifier achieves nearly 35dB. Furthermore, an embedded control system (ECS) based on the WinCE operating system (OS) and the chip of S3C2440 is proposed. This control system based on closed-loop feedback technology makes the peak power keeping constant even the pulse width tunable, which is convenient for the end user of the radar. This robust portable laser is remarkable and fulfills the desire of coherent detection excellently.

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Yaqian Ding, Xiang Zhang, Dong Li, Dapeng Wang, Renzhong Zhang, Chengying Song, Haozhao Che, Rui Wang, Baoling Guo, and Guanghui Chen "Constant peak-power single-frequency linearly-polarized all-fiber laser for coherent detection based on closed-loop feedback technology", Proc. SPIE 9674, AOPC 2015: Optical and Optoelectronic Sensing and Imaging Technology, 967424 (15 October 2015); https://doi.org/10.1117/12.2199862

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KEYWORDS

Optical amplifiers

Control systems

Signal to noise ratio

Bragg cells

Laser applications

Modulation

Pulsed laser operation

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