Sagnac loop in ring resonators for tunable optical filters

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 equ...

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Main Authors: Vargas, Salvador, Vázquez, Carmen, Sánchez Pena, José Manuel
Format: Artículo
Language: Inglés
Published: 2018
Online Access: https://www.osapublishing.org/jlt/abstract.cfm?uri=jlt-23-8-2555
http://ridda2.utp.ac.pa/handle/123456789/4897
Summary: 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.