A first-order perturbation calculation is performed on a generalized nonlinear Schrödinger equation in order to investigate the degree of squeezing that can be obtained for a medium described by such a field theory. Expressions for the amount of squeezing in the normal and anomalous dispersion regimes are obtained. In particular, it is found that the amount of squeezing is greater in the anomalous dispersion region than in the normal dispersion region. By keeping fourth-order derivatives in the field, the squeezing when the pump is located at the zero-dispersion wavelength is also investigated.

• Received 21 January 1987

DOI:https://doi.org/10.1103/PhysRevA.35.3974