Abstract
We report how the linewidth and line shape of a tunable semiconductor-optical-amplifier-based fiber ring laser can be actively adjusted by applying an intracavity frequency modulation to the laser. Frequency-modulated laser operation is achieved by driving the phase modulator frequency close to the cavity axial-mode spacing, leading to a constant-amplitude laser output having a periodically varying instantaneous frequency. The resulting linewidth varies proportionally with the inverse of the frequency detuning, and it is adjustable from submegahertz to over more than . By appropriate selection of the modulating waveform we have synthesized a near-Gaussian output line shape; other line shapes can be produced by modifying the modulating waveform. Experimental observations are in good agreement with a simple model.
© 2008 Optical Society of America
Full Article | PDF ArticleOSA Recommended Articles
Gong-Ru Lin, Yu-Sheng Liao, and Guang-Qun Xia
Opt. Express 12(10) 2017-2026 (2004)
Mingxiang Ma, Zhengliang Hu, Pan Xu, Wei Wang, and Yongming Hu
Appl. Opt. 51(30) 7420-7425 (2012)
Aurélien Thorette, Marco Romanelli, and Marc Vallet
Opt. Lett. 42(8) 1480-1483 (2017)