Abstract
Recently, single-mode fiber lasers with a long Fabry-Perot cavity or with a loop cavity were demonstrated by eliminating the spatial hole burning in the gain medium and using unpumped erbium-doped fiber as a saturable absorbing filter.1,2 Faraday rotators or optical isolators had to be added to suppress the spatial hole burning, which increases complexity of the laser and cost. On the other hand, there are many potential applications of fiber lasers having a few modes as long as they are stable. We describe a long Fabry-Perot fiber laser having a few stable longitudinal modes by using the combination of a saturable absorber and the position control of the gain medium without any other extra components.
© 1996 Optical Society of America
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