Optical add-drop multiplexer with hexagonal-hole lattice PC slab waveguides

Akiko Gomyo; Jun Ushida; Masayuki Shirane; Hirohito Yamada; Tao Chu; Satomi Ishida; Yasuhiko Arakawa

doi:10.1117/12.688568

23 October 2006 Optical add-drop multiplexer with hexagonal-hole lattice PC slab waveguides

Akiko Gomyo, Jun Ushida, Masayuki Shirane, Hirohito Yamada, Tao Chu, Satomi Ishida, Yasuhiko Arakawa

Proceedings Volume 6376, Optomechatronic Micro/Nano Devices and Components II; 63760J (2006) https://doi.org/10.1117/12.688568
Event: Optics East 2006, 2006, Boston, Massachusetts, United States

Abstract

We report on a channel drop filter with a mode gap in the propagating mode of a photonic crystal slab that was fabricated on silicon on an insulator wafer. The results, simulated with the 3-dimensional finite-difference time-domain and plane-wave methods, demonstrated that an index-guiding mode for the line defect waveguide of a photonic crystal slab has a band gap at wave vector k = 0.5 for a mainly TM-like light-wave. The mode gap works as a distributed Bragg grating reflector that propagates the light-wave through the line defect waveguide, and can be used as an optical filter. The filter bandwidth was varied from 1-8 nm with an r/a (r: hole radius, a: lattice constant) variation around the wavelength range of 1550-1600 nm. We fabricated a Bragg reflector with a photonic crystal line-defect waveguide and Si-channel waveguides and by measuring the transmittance spectrum found that the Bragg reflector caused abrupt dips in transmittance. These experimental results are consistent with the results of the theoretical analysis described above. Utilizing the Bragg reflector, we fabricated channel dropping filters with photonic crystal slabs connected between channel waveguides and demonstrated their transmittance characteristics. They were highly drop efficient, with a flattop drop-out spectrum at a wavelength of 1.56 μm and a drop bandwidth of 5.8 nm. Results showed that an optical adddrop multiplexer with a 2-D photonic crystal will be available for application in WDM devices for photonic networks and for LSIs in the near future.

Citation Download Citation

Akiko Gomyo, Jun Ushida, Masayuki Shirane, Hirohito Yamada, Tao Chu, Satomi Ishida, and Yasuhiko Arakawa "Optical add-drop multiplexer with hexagonal-hole lattice PC slab waveguides", Proc. SPIE 6376, Optomechatronic Micro/Nano Devices and Components II, 63760J (23 October 2006); https://doi.org/10.1117/12.688568

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KEYWORDS

Photonic crystals

Waveguides

Reflectors

Multiplexers

Transmittance

Silicon

Crystals

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