Reflectionless multichannel wavelength demultiplexer in a transmission resonator configuration

Department of Electrical Engineering , Stanford University, Palo Alto, California, United States
IEEE Journal of Quantum Electronics (Impact Factor: 1.89). 02/2003; 39(1):160 - 165. DOI: 10.1109/JQE.2002.806188
Source: IEEE Xplore

ABSTRACT A wave demultiplexer system with N channels in a two-dimensional photonic crystal is proposed. The demultiplexer is realized by the coupling among an ultra-low-quality factor microcavity and N resonators with high-quality factor. The coupling mode theory is employed to analyze the behavior of this system. The analytic results reveal that the reflection is fully absent at the peak frequencies for all channels. The simulations obtained by multiple-scattering method and experimental results in the microwave region show that the analysis is valid. This method might also be valuable for the design of other all-optical functional circuits.

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Available from: Chongjun Jin, Jul 30, 2013
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    • "Fan et al. could increase the output efficiency of a channel-drop filter by use of a pair of cavities instead of a single one [3]. Jin et al. designed reflectionless wavelength demultiplexer by employing a combination of high and low Q cavities [7]. The coupling system with a reflector was proposed and demonstrated for a high drop efficiency [8], [9]. "
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    ABSTRACT: We have derived the general condition to achieve 100% drop efficiency in the resonant tunneling-based channel drop filters of a threeport system with reflection feedback. According to our theoretical modeling based on the coupled mode theory in time, the condition is that the Q-factor due to coupling to a bus port should be twice as large as the Q-factor due to coupling to a drop port and the phase retardation occurring in the round trip between a resonator and a reflector should be a multiple of 2pi. The theoretical modeling also shows that the reflection feedback in the threeport channel drop filters brings about relaxed sensitivity to the design parameters, such as the ratio between those two Q-factors and the phase retardation in the reflection path. Based on the theoretical modeling, a fivechannel drop filter has been designed in a two-dimensional photonic crystal, in which only a single reflector is placed at the end of the bus waveguide. The performance of the designed filter has been numerically calculated using the finite-difference time domain method. In the designed filter, drop efficiencies larger than 96% in all channels have been achieved.
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