The possibility to compensate losses and aberrations in optical networks by means of phase-conjugating elements will be illustrated on the example of an active multichannel feedback system.Phase conjugating elements can be used for the compensation of aberrations and losses in optical systems. The realization of new optical transmitting
The sytem we investigated is called phase-conjugate ring-resonator (PCR). It consists of a Sagnac interferometer and a phase-conjugate mirror (PCM) realized by four-wave mixing in a photorefractive BaTiO3-crystal. Since the PCM provides nonlinear gain and high amplification, the PCR forms a nonlinear, active feedback system with a large image plane and a high resolution [1].
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