Soliton squeezing in a Mach-Zehnder fiber interferometer

A scheme for generating amplitude squeezed light by means of soliton self-phase modulation is experimentally demonstrated. By injecting 180-fs pulses into an equivalent Mach-Zehnder fiber interferometer, a maximum noise reduction of 4.4 +/- 0.3 dB; is obtained (6.3 +/- 0.6 dB when corrected for losses). The dependence of noise reduction on the interferometer splitting ratio and fiber length is studied in detail.