A configuration of single-longitudinal-mode (SLM) erbium-doped-fiber (EDF) ring laser with high stability and narrow linewidth is proposed and experimentally demonstrated. The device is composed of a dual-coupler fiber ring (DCFR) and an unpumped EDF-based saturable absorber (SA); the DCFR serves as the mode filter and facilitates the selection of the SLM while the SA produces the ultranarrow band autotracking filter effect and guarantees the SLM out. This scheme possesses the merits of being easy to fabricate, good performance, and high stability. It is easy to manufacture without strict limitations in the length of the DCFR. The output of the SLM EDF laser presents excellent performance with a linewidth of 1.52 kHz and the optical signal-to-noise ratio of 54 dB. Moreover, the proposed EDF laser exhibits remarkably good stability: the SLM operation is observed to have been stable for 3 h; the output power fluctuation and the central wavelength variation of the laser are 0.011 dB and 0.02 nm in 1 h, respectively.
A gourd-shaped subring resonator (GSR)-based single longitudinal mode erbium-doped fiber laser (EDFL) is proposed and experimentally demonstrated. The GSR can effectively expand the free spectral range of the fiber laser due to the Vernier effect and eliminate the dense longitudinal modes greatly. At the same time, an unpumped erbium-doped fiber serves as a saturable absorber to suppress mode hopping and stabilize frequency effectively. The experimental results show that the linewidth of the produced EDFL is ∼1.84 kHz and the output stability of power variation is nearly 0.02 dB. It can be seen that the EDFL could be exploited in applications where narrow linewidth and high power stability are both required.
By logically superimposing three base one dimensional (1D) photonic crystals, the broadband slow light with low dispersion is obtained. The slow light pass band is smoothed by adjusting the period ratio of three base structures, period number of new photonic crystal (PC) and the filling factor. In the optimized structure, the minimum of transmission (T) arrives at 0.5902, the full width half maximum (FWHM) is 55nm, the group velocity is in the range from 0.08326c to 0.2912c, and the group velocity dispersion (GVD) parameter D maximum is 14.65 ps2/nm·mm. Moreover, by material optimization, adjusting the refractive index of na and nb, the slow light properties can be improved further. With suitable materials, the T minimum increases to 0.6485, the group velocity decreases to the range from 0.08014c to 0.2592c, and GVD parameter D maximum decreases to 13.98 ps2/nm·mm with FWHM 52nm.
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