Optimal excitation of the Bloch modes of coupled resonator optical waveguides

Yoav Blau; Noam Berman; Jacob Scheuer

doi:10.1117/1.OE.53.10.102712

8 September 2014 Optimal excitation of the Bloch modes of coupled resonator optical waveguides

Yoav Blau, Noam Berman, Jacob Scheuer

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Optical Engineering, Vol. 53, Issue 10, 102712 (September 2014). https://doi.org/10.1117/1.OE.53.10.102712

Abstract

When light is injected into a microring-based coupled resonator optical waveguide (CROW), it usually excites one of the whispering gallery modes (WGMs) in each microring. Because the WGMs are not, in fact, the actual eigenmodes of the structure, the modal dispersion accompanied by such excitation schemes is expected to limit the device performance, especially for wide bandwidth and large time delay applications. To overcome this problem, an alternative method of exciting the CROW, via a Y power splitter exciting the symmetric eigenmode rather than a WGM, is proposed and studied in detail. The impact of fabrication tolerances and errors for silicon-on-insulator(SOI) are explored and analyzed. It is shown that this approach can significantly improve the performance of a CROW delay line in terms of eye-closure penalty and delay-bandwidth product.

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Yoav Blau, Noam Berman, and Jacob Scheuer "Optimal excitation of the Bloch modes of coupled resonator optical waveguides," Optical Engineering 53(10), 102712 (8 September 2014). https://doi.org/10.1117/1.OE.53.10.102712

Published: 8 September 2014

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KEYWORDS

Waveguides

Resonators

Dispersion

Microrings

Eye

Optical engineering

Wave propagation

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