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Silicon photonic filters with high rejection of both TE and TM modes for on-chip four wave mixing applications

Cantarella, Giuseppe and Klitis, Charalambos and Sorel, Marc and Strain, Michael J. (2017) Silicon photonic filters with high rejection of both TE and TM modes for on-chip four wave mixing applications. Optics Express, 25 (17). pp. 19711-19720. ISSN 1094-4087

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Abstract

Wavelength selective filters represent one of the key elements for photonic integrated circuits (PIC) and many of their applications in linear and non-linear optics. In devices optimised for single polarisation operation, cross-polarisation scattering can significantly limit the achievable filter rejection. An on-chip filter consisting of elements to filter both TE and TM polarisations is demonstrated, based on a cascaded ring resonator geometry, which exhibits a high total optical rejection of over 60 dB. Monolithic integration of a cascaded ring filter with a four-wave mixing micro-ring device is also experimentally demonstrated with a FWM efficiency of -22dB and pump filter extinction of 62dB.