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Internally-loaded ring resonator configuration for optical filter applications

TitleInternally-loaded ring resonator configuration for optical filter applications
Publication TypeJournal Article
Year of Publication2017
AuthorsPandey, A, Selvaraja, SKumar
JournalCSI transactions on ICT
KeywordsCoupled resonator induced transparency Line, Photonic integrated circuit, Ring resonators, Silicon photonics, width

We study on-chip Wavelength Division Multiplexing (WDM) application of ring resonators on Silicon-on-Insulator (SOI) platform. Though WDM devices have been demonstrated earlier, there are certain challenges which are yet to be tackled. Large FSR and narrow line width requirement for a WDM device cannot be fulfilled in a conventional WDM device as the requirement for both the metrics demand opposing structural requirements from a ring resonator. A larger FSR demands for a smaller resonator length whereas smaller line width requires a large resonator length device. We overcome this using an embedded type ring resonator configuration. The structure is made of a racetrack type ring resonator with another ring embedded inside it (loading the external ring). Such structures are capable of showing coupled resonator induced transparency (CRIT) which can result in a very narrow line-width. We present initial experimental demonstration of CRIT in an internally loaded micro ring resonator fabricated on SOI material platform. The structures were optimized using 3D-FDTD analysis and coupling-matrix method.