Increasing power and amplified spontaneous emission suppression for weak signal amplification in pulsed fiber amplifier

Yi Luo; Hanwei Zhang; Xiaolin Wang; Rongtao Su; Pengfei Ma; Pu Zhou; Zongfu Jiang

doi:10.1117/12.2284326

24 October 2017 Increasing power and amplified spontaneous emission suppression for weak signal amplification in pulsed fiber amplifier

Yi Luo, Hanwei Zhang, Xiaolin Wang, Rongtao Su, Pengfei Ma, Pu Zhou, Zongfu Jiang

Author Affiliations +

Proceedings Volume 10459, AOPC 2017: Optical Storage and Display Technology; 104590E (2017) https://doi.org/10.1117/12.2284326
Event: Applied Optics and Photonics China (AOPC2017), 2017, Beijing, China

Abstract

In the pulsed fiber amplifiers with repetition frequency of several tens kHz, amplified spontaneous emission (ASE) is easy to build up because of the low repetition frequency and weak pulse signal. The ASE rises the difficulty to amplify the weak pulse signal effectively. We have demonstrated an all-fiber preamplifier stage structure to amplify a 40 kHz, 10 ns bandwidth (FWHM) weak pulse signal (299 μW) with center wavelength of 1062 nm. Compared synchronous pulse pump with continuous wave(CW) pump, the results indicate that synchronous pulse pump shows the better capability of increasing the output power than CW pump. In the condition of the same pump power, the output power of synchronous pulse pump is twice as high as CW pump. In order to suppress ASE, a longer gain fiber is utilized to reabsorb the ASE in which the wavelength is shorter than 1062nm. We amplified weak pulse signal via 0.8 m and 2.1 m gain fiber in synchronous pulse pump experiments respectively, and more ASE in the output spectra are observed in the 0.8 m gain fiber system. Due to the weaker ASE and consequent capability of higher pump power, the 2.1 m gain fiber is capable to achieve higher output power than shorter fiber. The output power of 2.1 m gain fiber case is limited by pump power.

Citation Download Citation

Yi Luo, Hanwei Zhang, Xiaolin Wang, Rongtao Su, Pengfei Ma, Pu Zhou, and Zongfu Jiang "Increasing power and amplified spontaneous emission suppression for weak signal amplification in pulsed fiber amplifier", Proc. SPIE 10459, AOPC 2017: Optical Storage and Display Technology, 104590E (24 October 2017); https://doi.org/10.1117/12.2284326

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