QUANTUM STATISTICS OF FUNDAMENTAL AND HIGHER-ORDER COHERENT QUANTUM SOLITONS IN RAMAN-ACTIVE WAVE-GUIDES

The quantum dynamics of coherent optical pulses are studied using a no ndiagonal coherent-state generalized P representation including photon -phonon interactions. Photon-number squeezing of coherent quantum soli tons using spectral filtering is theoretically predicted. It is shown that Raman noise does not significantly reduce photon-number squeezing produced by spectral filtering of 1-ps fundamental coherent quantum s olitons in optical fibers. Coherent Nsech pulses with N>1 can show a l arger reduction in photon-number fluctuations even at room temperature . The reduction in quantum noise for N>1 is not restricted to photon n umber and an improvement of more than 3 dB is also found for the quadr ature-phase squeezed soliton experiments using a fiber Sagnac interfer ometer at 77 K.