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

Liu, Hsi-Chun and Yariv, Amnon (2012) "Ideal" optical delay lines based on tailored-coupling and reflecting, coupled-resonator optical waveguides. Optics Letters, 37 (11). pp. 1964-1966. ISSN 0146-9592. doi:10.1364/OL.37.001964.

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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.

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Additional Information:© 2012 Optical Society of America. Received November 24, 2011; revised February 1, 2012; accepted February 11, 2012; posted February 13, 2012 (Doc. ID 158806); published May 25, 2012. This work was supported by the National Science Foundation and the Army Research Office.
Funding AgencyGrant Number
Army Research Office (ARO)UNSPECIFIED
Issue or Number:11
Classification Code:OCIS codes: 230.4555, 130.3120, 230.7370, 250.4480
Record Number:CaltechAUTHORS:20120710-150216419
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32336
Deposited By: Tony Diaz
Deposited On:12 Jul 2012 21:32
Last Modified:09 Nov 2021 21:26

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