Ym. Hua et J. Conradi, SINGLE-POLARIZATION WAVELENGTH-TUNABLE FIBER LASER WITH A NONRECIPROCAL CAVITY, Journal of lightwave technology, 13(9), 1995, pp. 1913-1918
Unidirectional, continuously tunable, and polarized oscillation in an
Erbium doped fiber ring laser is demonstrated without an isolator. Non
reciprocal oscillation is realized with one polarization splitter and
two polarization controllers. Fine tuning is realized with fiber biref
ringence. The laser spectrum is continuously tunable from 1530 to 1560
nm with line widths less than 0.2 nm; the degree of polarization at t
he output is 92%.