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Analysis of negative group delay response of all-pass ring resonator with Mach-Zehnder interferometer

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4 Author(s)
Takahashi, H. ; KDDI R&D Labs. Inc., Saitama, Japan ; Carlsson, P. ; Nishimura, K. ; Usami, Masashi

The chromatic dispersion characteristics of waveguide all-pass filters were theoretically analyzed, in which the round-trip loss of a ring resonator was taken into account. Although an all-pass filter based on a ring resonator is lossless in principle, a finite round-trip loss of an actual filter changes an amplitude response and a group delay response drastically. The negative group delay resonance peak was confirmed both theoretically and experimentally.

Published in:

Photonics Technology Letters, IEEE  (Volume:16 ,  Issue: 9 )