Fiber Coupled Phase Conjugation Mirror and Temporal Information Exchange Using Photorefractive Materials
Abstract
Optical phase conjugation has been investigated extensively in many areas of nonlinear optics. In particular it is well known that it can be used to correct phase distortions because of the wavefront-reversal properties of an incoming optical wave. For this reason the main emphasis has been on the study of the properties of ordinary phase conjugate mirrors (PCM's) that reflect waves of a particular polarization (usually a linear polarization). In spite of the usefulness of the ordinary PCM's, however, they cannot be applied to the cases where the distortions include optical anistropics by which incident waves suffer from polarization scrambling as well as phase distortions. This is caused, for example, by the induced birefringence in high power optical amplifier stages and by the strong intermodal coupling in multimode fibers. These call for phase conjugation of both polarization components of the beam. We have investigated theoretically and experimentally on polarization and spatial information recovery by modal dispersal and phase conjugation. The scheme, which consists of a tandem combination of a multimode fiber and a photorefractive self-pumped PCM uses the inherent strong intermodal coupling (i.e., modal dispersal) in the fiber combined with phase conjugation of one polarization component of the depolarized (i.e., mode-scrambled) field emitted from the fiber.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 27, 1989
- Accession Number
- ADA238723
Entities
People
- A. Yariv
Organizations
- California Institute of Technology