A significant broad-bandwidth near-shot-noise-limited intensity noise suppression of a single-frequency fiber laser is demonstrated based on a semiconductor optical amplifier (SOA) with optoelectronic feedback. By exploiting the gain saturation effect of the SOA and the intensity feedback loop, a maximum noise suppression of over 50 dB around the relaxation oscillation frequencies and a suppression bandwidth of up to 50 MHz are obtained. The relative intensity noise of in the frequency range from 0.8 kHz to 50 MHz is achieved, which approaches the shot-noise limit. The obtained optical signal-to-noise ratio is more than 70 dB. This near-shot-noise-limited laser source shows important implications for the advanced fields of high-precision frequency stabilization, quantum key distribution, and gravitational wave detection.
© 2016 Optical Society of AmericaFull Article | PDF Article
16 March 2016: A correction was made to the funding section.
OSA Recommended Articles
Can Li, Shanhui Xu, Xiang Huang, Yu Xiao, Zhouming Feng, Changsheng Yang, Kaijun Zhou, Wei Lin, Jiulin Gan, and Zhongmin Yang
Opt. Lett. 40(9) 1964-1967 (2015)
Changsheng Yang, Xianchao Guan, Qilai Zhao, Bo Wu, Zhouming Feng, Jiulin Gan, Huihui Cheng, Mingying Peng, Zhongmin Yang, and Shanhui Xu
Opt. Express 25(12) 13324-13331 (2017)
Yubin Hou, Qian Zhang, and Pu Wang
Opt. Express 24(12) 12991-12999 (2016)