Title :
A
-Shifted Distributed-Feedback Laser Diode With a Fiber Ring Cavity Configuration Having an OSNR of 85 dB and a Linewidth of 7 kHz
Author :
Quynhanh, Ho Thi ; Suzuki, Akihito ; Yoshida, Masato ; Hirooka, Toshihiko ; Nakazawa, Masataka
Author_Institution :
Res. Inst. of Electr. Commun., To- hoku Univ., Sendai
Abstract :
We newly propose a lambda/4-shifted distributed-feedback laser diode (DFB-LD) that employs a fiber ring cavity configuration and which incorporates an ultranarrow band fiber Bragg grating (FBG) in the cavity. By controlling the FBG wavelength to match the oscillation wavelength of the DFB-LD, we achieved stable single-mode oscillation where the sidemodes of the DFB-LD and the Fabry-Perot modes induced by the ring configuration were sufficiently suppressed. Large performance improvements with an optical signal-to-noise ratio of 85 dB and a linewidth of 7 kHz were obtained.
Keywords :
Bragg gratings; distributed feedback lasers; semiconductor lasers; FBG wavelength; Fabry-Perot modes; distributed-feedback laser diode; fiber ring cavity; oscillation wavelength; single-mode oscillation; ultranarrow band fiber Bragg grating; Erbium-doped fiber lasers; Fiber lasers; Filters; Frequency; Laser modes; Optical fiber polarization; Optical mixing; Passband; Ring lasers; Semiconductor lasers; $lambda/4$ -shifted distributed-feedback laser diode (DFB-LD); Fiber Bragg grating (FBG); fiber ring laser;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2008.928848