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Dual-polarization silicon nitride Bragg filters with low thermal sensitivity

Abstract : Wideband and polarization-independent wavelength filters with low sensitivity to temperature variations have great potential for wavelength division multiplexing applications. However, simultaneously achieving these metrics is challenging for silicon-on-insulator photonics technology. Here, we harness the reduced index contrast and the low thermo-optic coefficient of silicon nitride to demonstrate waveguide Bragg grating filters with wideband apolar rejection and low thermal sensitivity. Filter birefringence is reduced by judicious design of a triangularly shaped lateral corrugation. Based on this approach, we demonstrate silicon nitride Bragg filters with a measured polarization-independent 40 dB optical rejection with negligible off-band excess loss, and a sensitivity to thermal variations below 20 pm/°C.
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Submitted on : Monday, December 16, 2019 - 1:44:27 PM
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Elena Duran-Valdeiglesias, Sylvain Guerber, Dorian Oser, Xavier Le Roux, Daniel Benedikovic, et al.. Dual-polarization silicon nitride Bragg filters with low thermal sensitivity. Optics Letters, Optical Society of America - OSA Publishing, 2019, 44 (18), pp.4578. ⟨10.1364/OL.44.004578⟩. ⟨hal-02413918⟩



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