title: Widely tunable ring-cavity tellurite fiber Raman laser.
abstract: We report a widely tunable ring-cavity tellurite fiber Raman laser covering the S+C+L+U band. A tunable range (1495-1600 nm, limited by the tunable optical bandpass filter) over 100 nm is obtained by using a single-mode tellurite fiber with high Raman gain coefficients (55 W(-1)km(-1)) and large Raman shift (approximately 22.3 THz) as the gain medium. Furthermore, the free-running 1665 nm Raman fiber laser is achieved from the ring cavity by removing the tunable optical bandpass filter, which shows that such a tellurite fiber has potential for constructing a widely tunable fiber Raman laser covering the S+C+L+U band. A high optical signal-to-noise ratio of over 60 dB for almost all of the tunable range is also demonstrated.
authors.affiliation: Research Center for Advanced Photon Technology, Toyota Technological Institute, Nagoya, Japan. gsqin@yahoo.com
authors.forename: Guanshi
authors.initials: G
authors.lastname: Qin
authors.forename: Meisong
authors.initials: M
authors.lastname: Liao
authors.forename: Takenobu
authors.initials: T
authors.lastname: Suzuki
authors.forename: Atsushi
authors.initials: A
authors.lastname: Mori
authors.forename: Yasutake
authors.initials: Y
authors.lastname: Ohishi