50μJ rectangular pulse at 10 kHz from an all-fiber polarization-maintaining MOPA amplifier

Xuan He; Bin Zhang; Linyong Yang; Tao Xun; Jing Hou

doi:10.1117/12.2522931

14 February 2019 50μJ rectangular pulse at 10 kHz from an all-fiber polarization-maintaining MOPA amplifier

Xuan He, Bin Zhang, Linyong Yang, Tao Xun, Jing Hou

Proceedings Volume 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018); 110484P (2019) https://doi.org/10.1117/12.2522931
Event: 17th International Conference on Optical Communications and Networks (ICOCN2018), 2018, Zhuhai, China

Abstract

For pulsed fiber amplifiers with repetition rate of tens of kHz, inter-pulse amplified spontaneous emission (ASE) is easy to build up and makes it difficult to amplify the weak signal effectively. Besides, amplified pulse shape of several tens of nanosecond would distort because of the dynamic gain saturation effect. In this paper, we demonstrate a polarization-maintained fiber laser system with three-stage amplifiers delivering pulse energy up to 70 μJ. The whole system is seeded by a semiconductor diode laser with central wavelength of 1063.9 nm and pulse repetition rate of 10 kHz which is driven directly by an arbitrary waveform electrical signal. We experimentally optimized the gain fiber length of the first-stage amplifier based on the reabsorption effect. The signal amplification efficiency and ASE proportion with different pump schemes in the first amplifier were investigated and compared in detail. Finally, an amplified pulse with 70 μJ energy accompanying with serious shape distortion was experimentally demonstrated. The signal to ASE ratio is as high as 54 dB from spectrum and the overall energy gain is 30 dB. Furthermore, a rectangular pulse with energy of 50 μJ was achieved by pre-compensating the shape distortion using the stochastic parallel gradient descent (SPGD) algorithm and the total energy gain is 28.5 dB.

Citation Download Citation

Xuan He, Bin Zhang, Linyong Yang, Tao Xun, and Jing Hou "50μJ rectangular pulse at 10 kHz from an all-fiber polarization-maintaining MOPA amplifier", Proc. SPIE 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018), 110484P (14 February 2019); https://doi.org/10.1117/12.2522931

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