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http://dx.doi.org/10.3807/KJOP.2005.16.3.266

Photonic Crystal Based Bandpass Filter Design for WDM Communication Systems  

Park, Dong-Soo (School of Electrical Engineering, Ajou University)
Kim, Sang-In (School of Electrical Engineering, Ajou University)
Park, Ik-Mo (School of Electrical Engineering, Ajou University)
Lim, Han-Jo (School of Electrical Engineering, Ajou University)
Publication Information
Korean Journal of Optics and Photonics / v.16, no.3, 2005 , pp. 266-274 More about this Journal
Abstract
We have designed photonic crystal based bandpass filters whose characteristics are suitable for WDM communication system. The filters consist of coupled point defect resonators in two-dimensional photonic crystal. The frequency response of coupled resonators has been analyzed by the coupling of modes in time, from which the design parameters for the coupled resonator filters have been extracted. For the appropriate choice of the design parameters, each resonator is treated as a lumped L-C resonance circuit, and from the analogy between the equivalent circuit and the standard L-C filter circuits, the design parameters are simply determined from the table for general filter circuit design. Based on the determined design parameters, a photonic crystal based filter has been designed and its performance has been calculated using the finite-difference time-domain method. The designed filter shows a pass band of 50GHz and 0.5 dB in-band ripple, which is suitable for typical WDM communication systems with 100GHz channel spacing.
Keywords
Photonic crystals; Optical bandpass filters; Coupling of mode in time; Wavelength division multiplexing(WDM);
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