AI Article Synopsis
- The design focuses on creating ideal optical delay lines with constant amplitude and group delay, utilizing reflection from coupled-resonator optical waveguides (CROWs).
- The inter-resonator coupling is strategically decreased to create all-pass Bessel filters, effectively managing group velocity dispersion.
- The resulting optical system demonstrates an enhanced delay-bandwidth product and can achieve efficient, dispersion-free amplification with the help of slow light propagation and uniform gain.
Article Abstract
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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| http://dx.doi.org/10.1364/OL.37.001964 | DOI Listing |
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