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.
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