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Proceedings Paper

Free-spectral-range-free microring-based coupling modulator with integrated contra-directional-couplers
Author(s): Ajay Mistry; Mustafa Hammood; Hossam Shoman; Stephen Lin; Lukas Chrostowski; Nicolas A. F. Jaeger
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Paper Abstract

In this work, we experimentally demonstrate a FSR-free, MRR-based, coupling modulator that integrates a bent, grating-based contra-directional-coupler (contra-DC) into a microring cavity to achieve an FSR-free response at its through port. Our modulator suppresses the amplitude response at all but one resonance, operating mode (hence, has an FSR-free response). In our modulator, coupling modulation is used and is achieved by modulating a relatively short, 210 μm long, p-n junction phase-shifter in a two-point coupler (which forms the drop-port coupler of the MRR). We demonstrate open eyes at 2.5 Gbps and discuss how the effects of DUV lithography on the contra-DC limited the electro-optic bandwidth of the fabricated modulator to 2.6 GHz. In these proceedings, we also cover details of the device design and the small and large signal characterization of the device, including an analysis of the effect of lithography on the “as-fabricated" device performance. We also discuss how to significantly improve the electro-optic bandwidth in future implementations by accounting for these lithographic effects in the device design flow and layout.

Paper Details

Date Published: 3 March 2020
PDF: 12 pages
Proc. SPIE 11276, Optical Components and Materials XVII, 1127607 (3 March 2020); doi: 10.1117/12.2545947
Show Author Affiliations
Ajay Mistry, The Univ. of British Columbia (Canada)
Mustafa Hammood, The Univ. of British Columbia (Canada)
Hossam Shoman, The Univ. of British Columbia (Canada)
Stephen Lin, The Univ. of British Columbia (Canada)
Lukas Chrostowski, The Univ. of British Columbia (Canada)
Nicolas A. F. Jaeger, The Univ. of British Columbia (Canada)


Published in SPIE Proceedings Vol. 11276:
Optical Components and Materials XVII
Shibin Jiang; Michel J. F. Digonnet, Editor(s)

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