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Optics Letters

Optics Letters


  • Editor: Anthony J. Campillo
  • Vol. 32, Iss. 13 — Jul. 1, 2007
  • pp: 1851–1853

Prediction and suppression of strong dispersive coupling in microracetrack channel drop filters

Qin Chen, Yue-De Yang, and Yong-Zhen Huang  »View Author Affiliations

Optics Letters, Vol. 32, Issue 13, pp. 1851-1853 (2007)

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For a four-port microracetrack channel drop filter, unexpected transmission characteristics due to strong dispersive coupling are demonstrated by the light tunneling between the input–output waveguides and the resonator, where a large dropping transmission at off-resonance wavelengths is observed by finite-difference time-domain simulation. It causes a severe decline of the extinction ratio and finesse. An appropriate decrease of the coupling strength is found to suppress the dispersive coupling and greately increase the extinction ratio and finesse, a decreased coupling strength can be realized by the application of an asymmetrical coupling waveguide structure. In addition, the profile of the coupling dispersion in the transmission spectra can be predicted based on a coupled mode theory analysis of an equivalent system consisting of two coupling straight waveguides. The effects of structure parameters on the transmission spectra obtained by this method agree well with the numerical results. It is useful to avoid the strong dispersive coupling region in the filter design.

© 2007 Optical Society of America

OCIS Codes
(120.2440) Instrumentation, measurement, and metrology : Filters
(230.3120) Optical devices : Integrated optics devices
(230.3990) Optical devices : Micro-optical devices
(230.5750) Optical devices : Resonators
(230.7020) Optical devices : Traveling-wave devices
(230.7370) Optical devices : Waveguides

ToC Category:
Optical Devices

Original Manuscript: March 27, 2007
Revised Manuscript: April 27, 2007
Manuscript Accepted: April 27, 2007
Published: June 21, 2007

Qin Chen, Yue-De Yang, and Yong-Zhen Huang, "Prediction and suppression of strong dispersive coupling in microracetrack channel drop filters," Opt. Lett. 32, 1851-1853 (2007)

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