Stable single longitudinal mode erbium-doped silica fiber laser based on an asymmetric linear three-cavity structure

Author： Ting Feng Feng-Ping Yan Qi Li Wan-Jing Peng Su-Chun Feng Si-Yu Tan Xiao-Dong Wen

ISSN： 1674-1056

Source： Chinese Physics B, Vol.22, Iss.1, 2013-01, pp. : 14208-14212

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Abstract

We present a stable linear-cavity single longitudinal mode (SLM) erbium-doped silica fiber laser. It consists of four fiber Bragg gratings (FBGs) directly written in a section of photosensitive erbium-doped fiber (EDF) to form an asymmetric three-cavity structure. The stable SLM operation at a wavelength of 1545.112 nm with a 3-dB bandwidth of 0.012 nm and an optical signal-to-noise ratio (OSNR) of about 60 dB is verified experimentally. Under laboratory conditions, the performance of a power fluctuation of less than 0.05 dB observed from the power meter for 6 h and a wavelength variation of less than 0.01 nm obtained from the optical spectrum analyzer (OSA) for about 1.5 h are demonstrated. The gain fiber length is no longer limited to only several centimeters for SLM operation because of the excellent mode-selecting ability of the asymmetric three-cavity structure. The proposed scheme provides a simple and cost-effective approach to realizing a stable SLM fiber laser.