Title :
A unidirectional Er/sup 3+/-doped fiber ring laser without isolator
Author :
Shi, Yuan ; Sejka, Milan ; Poulsen, Ove
Author_Institution :
Mikroelektronik Centret, Tech. Univ. Denmark, Lyngby, Denmark
fDate :
3/1/1995 12:00:00 AM
Abstract :
An Er/sup 3+/-doped fiber ring laser with unidirectional operation without optical isolator has been investigated for different cavity conditions. The fiber ring laser cavity is built in such a way that the optical fields propagating in the two directions suffer different losses. As a consequence, the laser oscillation appears in a quasi-unidirectional form. By incorporating a fiber pigtailed bandpass filter to enhance mode competition, a purely unidirectional tunable fiber ring laser is obtained with high efficiency and broad tunability.<>
Keywords :
erbium; fibre lasers; laser cavity resonators; laser modes; laser tuning; optical fibre filters; optical fibre losses; ring lasers; broad tunability; cavity conditions; fiber pigtailed bandpass filter; fiber ring laser cavity; high efficiency; laser oscillation; losses; mode competition; optical fields; quasi-unidirectional form; unidirectional Er/sup 3+/-doped fiber ring laser; unidirectional operation; Band pass filters; Erbium; Fiber lasers; Isolators; Laser modes; Optical fiber losses; Optical filters; Optical propagation; Propagation losses; Ring lasers;
Journal_Title :
Photonics Technology Letters, IEEE
