Symmetry induced modal dispersion in CROWs

Jacob Scheuer

doi:10.1117/12.848649

11 February 2010 Symmetry induced modal dispersion in CROWs

Jacob Scheuer

Proceedings Volume 7612, Advances in Slow and Fast Light III; 76120C (2010) https://doi.org/10.1117/12.848649
Event: SPIE OPTO, 2010, San Francisco, California, United States

Abstract

We study the dispersion properties of a microring/microdisk based CROW delay line. We show that despite the double degeneracy of the individual resonators, the Bloch modes of the CROW split into non-degenerate symmetric and antisymmetric branches. Depending on the inter-resonator gap and the angular modal number, these distinct branches may not overlap at all, thus suppressing the propagation of whispering gallery modes based Bloch waves. The impact of the additional (modal) dispersion on the achievable delays and the penalty on communication link are studied it detail. The dispersion cause by the symmetry of Bloch modes symmetry is found to be substantial, especially for ultra-compact CROWs, and may result in substantial performance degradation if not taken into account.

Citation Download Citation

Jacob Scheuer "Symmetry induced modal dispersion in CROWs", Proc. SPIE 7612, Advances in Slow and Fast Light III, 76120C (11 February 2010); https://doi.org/10.1117/12.848649

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KEYWORDS

Resonators

Wave propagation

Dispersion

Microrings

Superposition

Terahertz radiation

Light wave propagation

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