title: C-band single-longitudinal mode lanthanum co-doped bismuth based erbium doped fiber ring laser.
abstract: We propose and demonstrate a stable, tunable and narrow linewidth C-band lanthanum co-doped bismuth based erbium doped fiber (EDF) ring laser with single longitudinal mode (SLM) operation. A free space thin film filter acts as a wavelength discriminative component selecting a few oscillating modes while a Lyot filter formed by a polarization maintaining (PM) fiber and a linear polarizer further discriminates and selects SLM efficiently. A power stability of < or = 0.05 dB, central wavelength variation of < or = 0.02 nm, a side-mode suppression ratio (SMSR) of at least > 43 dB, and a linewidth of about 1.3 kHz have been experimentally demonstrated.
authors.affiliation: Photonics Research Centre, Department of Electrical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong. khurram@alumni.polyu.edu.hk
authors.forename: Khurram Karim
authors.initials: KK
authors.lastname: Qureshi
authors.forename: X H
authors.initials: XH
authors.lastname: Feng
authors.forename: L M
authors.initials: LM
authors.lastname: Zhao
authors.forename: H Y
authors.initials: HY
authors.lastname: Tam
authors.forename: C
authors.initials: C
authors.lastname: Lu
authors.forename: P K A
authors.initials: PK
authors.lastname: Wai