Topic
Phase conjugation
About: Phase conjugation is a research topic. Over the lifetime, 3694 publications have been published within this topic receiving 49099 citations.
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TL;DR: In this paper, the authors demonstrate phase conjugate generation of 10 GBd PM-QPSK signal, simultaneously in both input and output ports of the SOA, with a penalty of < 1.5 dB.
Abstract: We experimentally demonstrate polarization-insensitive phase conjugate generation in a semiconductor optical amplifier (SOA) using a counter-propagating and cross-polarized degenerate pump. The polarization-insensitive operation is achieved in both the ports of the SOA through Bragg scattering four-wave mixing. The nature of polarization transformation of the process necessitates the selection of frequency of the signal to be larger than that of the pump for the penalty-free performance of the polarization-insensitive conjugate generation. We demonstrate the phase conjugate generation of 10 GBd PM-QPSK signal, simultaneously in both input and output ports of the SOA, with a penalty of <1.5 dB.
11 citations
TL;DR: In this article, a scheme using phase conjugation via stimulated Brillouin scattering in methane gas has been developed for the accurate conjugations of both the polarisation state and the phase of a non-uniformly depolarised laser beam.
11 citations
TL;DR: In this paper, the effects of density, temperature, and velocity gradients on four-wave mixing (FWM) in a plasma are investigated, and the steady state phase conjugate reflectivity and signal transmission coefficients are calculated and discussed for both degenerate and resonant FWM.
Abstract: The effects of density, temperature, and velocity gradients on four-wave mixing (FWM) in a plasma are investigated A fluid model is used in which the stimulated Brillouin terms are included, but pump depletion is neglected The steady state phase conjugate reflectivity and signal transmission coefficients are calculated and discussed for both degenerate and resonant FWM The substantial effects of inhomogeneity on the use of FWM as a plasma diagnostic are discussed
11 citations
TL;DR: In this paper, a phase-conjugate sound wave of 6 MHz generated by a ferrite under parametric pumping by a magnetic field which exceeds the absolute instability threshold is studied in water.
11 citations
06 Jun 2004
TL;DR: A new architecture implementing full-duplex communication using a retrodirective array transceiver overcomes the difficulty of corruption of the outgoing retrodirected signal by the incoming interrogation signal inherent when using phase conjugation mixers.
Abstract: This paper introduces a new architecture implementing full-duplex communication using a retrodirective array transceiver. The array scheme overcomes the difficulty of corruption of the outgoing retrodirected signal by the incoming interrogation signal inherent when using phase conjugation mixers. To remedy this problem, mutually-exclusive modulation techniques are utilized: uplink data is contained in time domain while the downlink data is contained in the polarization of the retrodirected signal. A phase conjugation mixer which is also able to modulate the polarization sense of the output radiation is also discussed for use in the retrodirective transceiver array.
11 citations