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In this paper a novel photonic crystal (PC) phase comparator is proposed. The proposed structure can be used in a PC Mach–Zehnder as the signal adder section to improve its performance. The phase comparator provides an approximately 15 dB contrast ratio for the wavelength range of 1545–1555 nm. The finite difference time domain method and plane wave expansion method are used to evaluate the structure.
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Danaie et al. (2010) studied this question.
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