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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 28 — Oct. 1, 2009
  • pp: 5324–5336

Analysis and demonstration of coupling control in polymer microring resonators using photobleaching

Greeshma Gupta, Ying-Hao Kuo, Hidehisa Tazawa, William H. Steier, Andrew Stapleton, and John D. O’Brien  »View Author Affiliations

Applied Optics, Vol. 48, Issue 28, pp. 5324-5336 (2009)

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We describe postfabrication trimming of coupling in both laterally and vertically coupled polymer microring resonators (MRRs), using photobleaching. For both cases, a tapered directional-coupler-based simple analytical model is developed to simulate the change in coupling due to a bleaching-induced decrease in refractive index. A tightly focused laser beam spot (a few kilowatts per square centimeter) is used to precisely bleach the coupling region alone. Coupling control is achieved for (1) high-Q passive rings by bleaching the vertically coupled chromophore-doped bus waveguide, and for (2) laterally coupled electro-optic ring modulators, by bleaching both the ring and the waveguide in the coupling region. The power coupling ratio (PCR) of an undercoupled high-Q MRR filter is reduced by 0.54 percentage points for the TE mode, causing the MRR finesse to increase from a value of 72 to 108. For a ring modulator, the PCR was increased by 3.5 percentage points for the TM mode, causing a 6 dB increase in extinction ratio, to achieve a final value of nearly 25 dB . Phase/group-delay characterization confirmed that the ring was trimmed toward critical coupling.

© 2009 Optical Society of America

OCIS Codes
(230.4555) Optical devices : Coupled resonators
(130.5460) Integrated optics : Polymer waveguides

ToC Category:
Integrated Optics

Original Manuscript: July 10, 2009
Manuscript Accepted: August 13, 2009
Published: September 21, 2009

Greeshma Gupta, Ying-Hao Kuo, Hidehisa Tazawa, William H. Steier, Andrew Stapleton, and John D. O'Brien, "Analysis and demonstration of coupling control in polymer microring resonators using photobleaching," Appl. Opt. 48, 5324-5336 (2009)

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