Open AccessSubkilohertz linewidth reduction of a DFB diode laser using self-injection locking with a fiber Bragg grating Fabry-Perot cavity
Author(s) -
Wei Fang,
Fei Yang,
Xi Zhang,
Dan Xu,
Mengxian Ding,
Li Zhang,
Dijun Chen,
Haiwen Cai,
Zujie Fang,
Xiaodong Gu
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.017406
Subject(s) - laser linewidth , materials science , optics , relative intensity noise , fiber bragg grating , distributed feedback laser , fiber laser , semiconductor laser theory , laser , optoelectronics , laser diode , injection seeder , fabry–pérot interferometer , diode , physics
A simple and low-cost 1550 nm semiconductor laser with subkilohertz intrinsic linewidth is experimentally demonstrated. A commercial distributed feedback diode laser is self-injection locked to the resonance transmission peaks of a fiber Bragg grating Fabry-Perot cavity through a polarization-maintaining fiber ring with the optical path length of 4 m, with the laser frequency noise suppressed by over 70 dB in the Fourier frequency band from 5 Hz and 1 kHz. The laser features an intrinsic Lorentzian linewidth of 125 Hz as well as a relative intensity noise of <-142 dBc/Hz above 2 MHz, and provides over 0.8 nm quasi-continuous tunability, which is suitable for advanced applications requiring a narrow linewidth laser with ultralow frequency noise.