A single longitudinal mode (SLM) polarization maintaining (PM) erbium-doped fiber laser (EDFL) with a crossed-double- ring passive subring resonator (CPSR) is put forward and experimentally investigated. The designed CPSR consists of two dual-coupler fiber rings, productively inhibiting large number of longitudinal modes oscillation and featuring narrow filtering bandwidth to achieve the SLM output. The configuration of all PM decreases the insertion losses of the polarization adjustment devices used in non-PM EDFL for the optimal SLM output. The experimental consequences illustrate that the linewidth of the put forward EDFL is approximately 278 Hz and the optical signal to noise ratio (OSNR) is about 70 dB, potential for the applications of requirements for narrow linewidth and high OSNR.
An L-band single-longitudinal-mode (SLM) erbium-doped fiber laser (EDFL) is proposed and experimentally demonstrated to exhibit an ultranarrow linewidth and a high optical signal-to-noise ratio. A multistage filter, which is composed of a thin film filter, a fiber Bragg grating, and a saturation absorption, is utilized as an effective mode-selecting filter to achieve an SLM EDFL. The SLM EDFL with an ultranarrow linewidth of 205 Hz is obtained at the measurement resolution bandwidth of 100 Hz. In addition, the stability performance of the EDFL is measured during 30 min. The maximum fluctuations of the center wavelength and the output power of the proposed EDFL are 0.04 nm and 0.01 dB.
A stable S-band single longitudinal mode (SLM) erbium-doped fiber laser (EDFL) with narrow linewidth based on passive multiple-subring resonator (PMSR) has been proposed and experimentally verified. The designed structure of PMSR can effectively expand the equivalent free spectral range and eliminate dense longitudinal modes. In addition, the dual-coupled fiber ring contained therein can form a narrow-band comb filter with good mode selection performance. Incorporating a section of saturable absorber can effectively suppress mode hopping and maintain stable SLM laser oscillation. The proposed S-band EDFL demonstrates that the linewidth is as narrow as 763.427 Hz. An optical signal-to-noise ratio of about 70 dB centered at 1499.770 nm and a wavelength stability of 0.04 nm have been obtained, respectively. This S-band EDFL is promising for the future S-band applications.
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