Abstract

The realization of a compact squeezed-state-generation device at 1.5 µm may have potential applications in optical communication. The squeezed state has been generated in both χ⁽²⁾ and χ⁽³⁾ media. In χ⁽²⁾ media the frequency of the squeezed vacuum is half that of the pump. Therefore frequency doubling is necessary for generating a local oscillator (LO). Such frequency doubling is not needed in χ⁽³⁾ media. However, squeezing in y⁽³⁾ media has not been as successful as in X⁽²⁾ media, for example, in atomic vapor,¹ self-focusing seriously limits the amount of squeezing, whereas in optical fibers,² guided-acoustic-wave Brillouin-scattering (GAWBS) noise causes difficulties that can be circumvented through low- temperature cooling of the fiber or the use of soli ton pulses.

© 1994 Optical Society of America