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: It is observed that the specular reflectivity from the input face of a phase-conjugate mirror decreases by over 600% relative to the standard Fresnel reflectivity value upon the onset of phase conjugation, or wave-front reversal.
Abstract: We observe that the specular reflectivity from the input face of a ${\mathrm{BaTiO}}_{3}$ phase-conjugate mirror decreases by over 600% relative to the standard Fresnel reflectivity value upon the onset of phase conjugation, or wave-front reversal. Reasonable agreement is obtained using a model involving the destructive interference of the Fresnel-reflected beam with a series of phase-conjugate wave generated internal to the crystal. The basic diminishing effect should be universal and hence observable in other classes of self-pumped and externally pumped phase conjugators.
28 citations
TL;DR: The use of holography to achieve the phase conjugation of temporal signals is theoretically discussed and the reversal of a particular asymmetric pulse envelope is experimentally demonstrated.
Abstract: We theoretically discuss the use of holography to achieve the phase conjugation of temporal signals. The reversal of a particular asymmetric pulse envelope is experimentally demonstrated. The holographic material is a photorefractive crystal used in a four-wave mixing configuration.
28 citations
TL;DR: A new phase conjugating architecture suitable for deployment as the core building block in retrodirective antenna arrays, which can be scaled to any number of elements in a modular way without impacting on complexity is verified.
Abstract: In this paper, we verify a new phase conjugating architecture suitable for deployment as the core building block in retrodirective antenna arrays, which can be scaled to any number of elements in a modular way without impacting on complexity. Our solution is based on a modified in-phase and quadrature modulator architecture, which completely resolves four major shortcomings of the conventional mixer-based approach currently used for the synthesis of phase conjugated energy derived from a sampled incoming wavefront. 1) The architecture presented removes the need for a local oscillator running at twice the RF signal frequency to be conjugated. 2) It maintains a constant transmit power even if receive power goes as low as -120 dBm. 3) All unwanted re-transmit signal products are suppressed by at least 40 dB. 4) The issue of poor RF-IF leakage prevalent in mixer-based phase-conjugation solutions is completely mitigated. The circuit has also been shown to have high conjugation accuracy (better than plusmn1deg at -60-dBm input). Near theoretically perfect experimental monostatic and bistatic results are presented for a ten-element retrodirective array constructed using the new phase conjugation architecture.
28 citations
28 citations
TL;DR: It is shown that reducing the spacing between phase conjugations allows for significantly improved performance in the presence of polarisation mode dispersion or a significant relaxation in the acceptable level of polarizationmode dispersion.
Abstract: In this paper, we numerically investigate the impact of polarisation mode dispersion on the efficiency of compensation of nonlinear transmission penalties for systems employing one of more inline phase conjugation devices. We will show that reducing the spacing between phase conjugations allows for significantly improved performance in the presence polarisation mode dispersion or a significant relaxation in the acceptable level of polarization mode dispersion. We show that these results are consistent with previously presented full statistical analysis of nonlinear transmission appropriately adjusted for the reduced section length undergoing compensation.
28 citations