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Journal of the Optical Society of America B

Photonic crystal phase detector

Vajira S. Amaratunga, Haroldo Takashi Hattori, Malin Premaratne, Hark Hoe Tan, C. Jagadish

Published Aug 21, 2008• 9 citations
Publisher

Abstract

In a recent article, it was shown that side-coupled photonic crystal (PhC) cavity arrays had dark and bright states depending upon the relative phase between the excitation optical sources. We show that the existence of dark and bright states in these arrays can be used to develop a phase detector, which can find applications in optical differential phase-shift-keying demodulation systems.

DOI
10.1364/josab.25.001532

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In a recent article, it was shown that side-coupled photonic crystal (PhC) cavity arrays had dark and bright states depending upon the relative phase between the excitation optical sources. We show that the existence of dark and bright states in these arrays can be used to develop a phase detector, which can find applications in optical differential phase-shift-keying demodulation systems.
Abstract We theoretically propose a photonic flash based on a linearly coupled cavity system. Via driving the two side cavities by external fields, it forms a cyclic energy-level diagram and therefore the phase difference between the driving fields acts as a controller of the steady state due to the quantum interference effect. In the optical trimer structure, we show that the perfect photonic flash can be realized in the situation of resonant driving. The perfect photonic flash scheme is furthermore generalized to multiple coupled cavity system, where the cavities with odd and even number turn bright and dark alternatively. Our proposal may be applied for designing the quantum neon and realizing a controllable photonic localization .
We experimentally demonstrate the security vulnerability in the temporal phase coding single-user differential phase-shift keying (DPSK) and code-shift keying (CSK) OCDMA systems with a DPSK demodulator. In the experiment, we build up the 2.5Gbit/s DPSK- and CSK-OCDMA systems. In the systems, we use two 31-chip 640 Gchip/s superstructured fiber Bragg grating encoders for the signal encoding. In the receiving side, we remove the decoders and utilize the DPSK demodulator to detect the encoded signals directly. We successfully achieve the error-free BER performance and obtaine the clear open eye diagrams using the detection without the proper decoding. It indicates the existence of the eavesdropping vulnerability in the both systems. Furthermore, we also discuss the principle of DPSK demodulation attack.