Ultra low cross talk in crossed strip waveguides with the assistance of a photonic crystal cavity

Rami A. Wahsheh; Zhaolin Lu; Mustafa A. G. Abushagur; Stefan F. Preble

doi:10.1117/12.795250

25 August 2008 Ultra low cross talk in crossed strip waveguides with the assistance of a photonic crystal cavity

Rami A. Wahsheh, Zhaolin Lu, Mustafa A. G. Abushagur, Stefan F. Preble

Proceedings Volume 7056, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications II; 70560E (2008) https://doi.org/10.1117/12.795250
Event: Photonic Devices + Applications, 2008, San Diego, California, United States

Abstract

In this paper, ultra low cross talk is achieved by using a resonant cavity at the intersection between two strip waveguides formed in a square lattice photonic crystal structure (PhC). Two PhC structures are studied: one consists of cylindrical rods and another consists of cubic rods. The Q-Factor of the cavity is changed by increasing the number of rods that form the cavity and by decreasing the spacing between the waveguide and the cavity. Our two dimensional simulation results show that the latter method resulted in cross talk reduction of more than 21 dB for both structures. The overall cross talk was -90.50 dB for the cylindrical rods structure and -105.0 dB for the cubic rods structure. The optimized PhC structures were fabricated on a silicon-on-insulator platform. The rods were buried in silicon oxide in order to maximize the photonic band gap and provide index guiding in the vertical direction.

Citation Download Citation

Rami A. Wahsheh, Zhaolin Lu, Mustafa A. G. Abushagur, and Stefan F. Preble "Ultra low cross talk in crossed strip waveguides with the assistance of a photonic crystal cavity", Proc. SPIE 7056, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications II, 70560E (25 August 2008); https://doi.org/10.1117/12.795250

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