A simplified ring cavity for achieving a unidirectional room temperature multi-wavelength erbium-doped fiber ring laser without optical isolator is demonstrated. The fiber ring cavity is built in such a way that the optical fields propagating in two directions suffer different losses caused by one sampled fiber Bragg grating. Furthermore, simultaneous multi-wavelength lasing with 0.8-nm intervals is demonstrated with sinusoidal phase modulation just before the sampled fiber Bragg grating to prevent single-wavelength lasing and unstable wavelength oscillation.
© 2005 Chinese Optics Letters
Guoyong Sun, Jing Yang, Ronghui Qu, Zujie Fang, and Xiangzhao Wang, "A unidirectional room temperature multi-wavelength fiber ring laser without isolator," Chin. Opt. Lett. 2, 282-284 (2004)