Ring Cavity Erbium-doped Fiber Laser

In last few years, Erbium-doped fiber (EOF) laser has attracted more and more attention because of fiber communication. Based on the character of the EOF gain at 1550 nm, a laser diode (LD) worked at 980 nm and acted as the pumping source, a EOF employed as gain medium, and a fiber grating used as reflector, an ring-cavity all-fiber laser worked at 1562.5 nm was demonstrated with an output power of 2.0 mw and a bandwidth of 0. 08nm.In this paper, the theory of EOF laser was discussed in detail. The factors that influenced the output of the laser were analyzed theoretically.The output power of the laser was observed to be related with the length of EOF, the coupled-ration of the output coupler and the loss of splicing. Active modes were presented and have been used to stabilize the output power of the laser. By heating fiber bragg grating, EDF laser was tuned and obtained multiwavelength laser output.