Abstract

We report an erbium fiber laser with an in-fiber Bragg reflector.¹ An erbium fiber laser operating at 1550 nm with + 9.4 dBm output power has been constructed. A semiconductor laser operating near 1480 nm provided the pump power. The schematic of the laser is shown in Fig. 1. A narrow-band in-fiber Bragg reflector^2.3 is used to select the wavelength of operation. Data showing the grating transmission and reflection bands of the grating are presented. The fiber amplifier model presented by Desurvire3 was modified to provide a model of the fiber laser. The experimentally obtained slope efficiency of the laser is compared with a theoretical model. Simulation results showed a threshold of 12.5 mW and an input signal power of 12.9 dBm, with 17.2 dBm pump power input. The experimental data has a threshold of 14 mW and 9.4 dBm output-signal power. The threshold of the simulation result agrees closely with the experimental data. The simulation results also showed that the optimum fiber length under the same operation condition would be 15.5 m, with the residual pump power ~5% of the input power. Further improvement can be achieved by optimisation of the effective mirror reflection coefficients and erbium fiber concentration.

© 1991 Optical Society of America