Fiber Coupled Phase Conjugation Mirror and Temporal Information Exchange Using Photorefractive Materials
Final rept. 28 Sep 87-27 Sep 89,
CALIFORNIA INST OF TECH PASADENA
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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 PCMs that reflect waves of a particular polarization usually a linear polarization. In spite of the usefulness of the ordinary PCMs, 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.
- Fiber Optics and Integrated Optics