The noise spectra and frequency chirping of semiconductor lasers in the presence of arbitrary amounts of optical feedback are analyzed. Short external cavities with strong optical feedback are found to reduce the noise dramatically in semiconductor lasers, especially in the high-frequency regime. Frequency chirping is shown to be closely related to the nonlinear gain effect.
© 1989 Optical Society of America
Rongqing Hui and Yizun Wu, "Noise and frequency chirping in external-cavity semiconductor lasers," Opt. Lett. 14, 668-670 (1989)