We have measured the longitudinal-mode-partition noise of free-running, grating-feedback external-cavity and injection-locked semiconductor lasers, using a nonsymmetric Mach–Zehnder interferometer. For an external-cavity laser operated at a high pumping level, the contribution of the longitudinal-mode-partition noise to the total intensity noise was negligible, and 0.9 dB of amplitude squeezing was observed. On the other hand, injection locking suppressed the longitudinal-mode-partition noise by 34 dB, and 1.9 dB of amplitude squeezing was observed when the locking bandwidth was 5 GHz. A further increase in the locking bandwidth reduced the suppression of the longitudinal-mode-partition noise and degraded the amplitude squeezing.
© 1997 Optical Society of America
[Optical Society of America ]
Shuichiro Inoue, Seema Lathi, and Yoshihisa Yamamoto, "Longitudinal-mode-partition noise and amplitude squeezing in semiconductor lasers," J. Opt. Soc. Am. B 14, 2761-2766 (1997)