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Sagnac loop in ring resonators for tunable optical filters

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3 Author(s)
Vazquez, C. ; Electron. Technol. Dept., Univ. Carlos III of Madrid, Spain ; Vargas, S.E. ; Pena, J.M.S.

General filter architecture using co- and counterpropagation signals are studied. A specific configuration based on a Sagnac loop within a ring resonator is analyzed. Novel tuning, apart from conventional tuning, is achieved by changing the coupling ratio of a coupler through the adjustment of the equivalent loop length. Full equations describing the filter behavior in passive and active configurations, and simple closed-form formulas to compute the tuning, tolerance, and full-width at half-maximum are reported. The performance of these devices is discussed for their application as selective or channel-dropping ultra-narrow-band filters. The effect of losses and their dispersion properties are also discussed. These devices can be conveniently implemented, using silicon- or InP-integrated optic technology, for they have high free spectral ranges.

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Lightwave Technology, Journal of  (Volume:23 ,  Issue: 8 )