Simultaneous measurement of the signal-noise level and the corresponding shot-noise level using balanced direct detectors with a delay line is demonstrated. We have observed 1.3-dB squeezing from a constant-current-driven semiconductor laser, which is consistent with 3-dB squeezed noise at the output of the laser when the detection efficiency is taken into account.
© 1989 Optical Society of America
Original Manuscript: October 25, 1988
Manuscript Accepted: June 25, 1989
Published: October 1, 1989
Susumu Machida and Yoshihisa Yamamoto, "Observation of amplitude squeezing from semiconductor lasers by balanced direct detectors with a delay line," Opt. Lett. 14, 1045-1047 (1989)