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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 11 — Jun. 1, 2012
  • pp: 1964–1966

“Ideal” optical delay lines based on tailored-coupling and reflecting, coupled-resonator optical waveguides

Hsi-Chun Liu and Amnon Yariv  »View Author Affiliations

Optics Letters, Vol. 37, Issue 11, pp. 1964-1966 (2012)

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We present a design of “ideal” optical delay lines (i.e., constant amplitude and constant group delay over the desired bandwidth). They are based on reflection from coupled-resonator optical waveguides (CROWs). The inter-resonator coupling coefficients are tailored and decrease monotonically with the distance from the input to realize all-pass Bessel filters. The tailored coupling coefficients result in a frequency-dependent propagating distance which compensates for the group velocity dispersion of CROWs. We present a simple formalism for deriving the time-domain coupling coefficients and convert these coefficients to field coupling coefficients of ring resonators. The reflecting CROWs possess a delay-bandwidth product of 0.5 per resonator, larger than that of any kind of transmitting CROW. In the presence of uniform gain, the gain enhanced by slow light propagation and the constant group delay result in efficient and dispersion-free amplifiers.

© 2012 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(230.7370) Optical devices : Waveguides
(250.4480) Optoelectronics : Optical amplifiers
(230.4555) Optical devices : Coupled resonators

ToC Category:
Optical Devices

Original Manuscript: November 24, 2011
Revised Manuscript: February 1, 2012
Manuscript Accepted: February 11, 2012
Published: May 25, 2012

Hsi-Chun Liu and Amnon Yariv, "“Ideal” optical delay lines based on tailored-coupling and reflecting, coupled-resonator optical waveguides," Opt. Lett. 37, 1964-1966 (2012)

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