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