Ring Cavity Erbium-doped Fiber Laser

Based on the character of the EDF gain at 1550 mm, a laser diode (LD) worked at 980 nm and acted as the pumping source, a EDF employed as gain medium, and a fiber grating used as reflector, an ring-cavity all-fiber laser worked at 1552.6 mm was demonstrated with an output power of 0.6 mW and a bandwidth of 0.1 mm. In this thesis, the theory of EDF 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 EDF, the coupled-ration of the output coupler and the loss of splicing. Active and passive modes were presented and have been used to stabilize the output power of the laser.