Abstract:

Optical soliton amplitude squeezed state caused by intensity correlation self-phase modulation effect was generated experimentally. The main part of experiment system was asymmetric Sagnac interferometer. Pulsed laser was connected to a coupler with splitting ratio of 90:10 by PC/FC connector. The coupler and 40-meter photonic crystal fiber composed interference loop. At proper input power, optical soliton amplitude squeezed state could be observed at output terminal of the interferometer. Balanced homodyne detection system composed of 50/50 beam splitter, two low-noise photo detectors, adder/subtracter, and spectrum analyzer was used to detect the squeezed state. Intensity distribution curves of input and output of the Sagnac loop were drawn, and the signal noise curve using shot noise as reference was obtained. The compressibility was 1.6 dB. Analysis on experimental data shows that it’s possible to improve compressibility further by choosing proper photonic crystal fiber.

Key words: photonic crystal fiber, optical soliton, squeezed state