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Broadband Polarization Beam Splitter on a Silicon Nitride Platform for O-Band Operation

Abstract : Wideband polarization beam splitters (PBS) are a key building block in polarization management circuits for wavelength division multiplexing applications. A broadband PBS on a 300-mm silicon nitride (SiN) photonic platform is reported based on phase-controlled directional coupler (DC). Unlike classical DC-based PBS made on silicon, the proposed configuration leverages the comparatively lower birefringence in SiN to yield wideband and efficient splitting. A semi-analytical approach, based on transfer matrix modeling and 3-D finite difference time domain, has been used to design and optimize the structure for O-band operation. The proposed PBS has been experimentally demonstrated showing insertion loss (IL) lower than 0.6 dB and extinction ratio (ER) as high as 10 dB over 95-nm bandwidth for both polarizations. Furthermore, this simplified architecture eases cascading, allowing the demonstration of IL below 1.1 dB and ER larger than 24 dB over 85-nm wavelength range in a dual-stage configuration.
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Submitted on : Friday, November 30, 2018 - 8:26:31 AM
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Sylvain Guerber, Carlos Alonso-Ramos, Daniel Benedikovic, Elena Duran-Valdeiglesias, Xavier Le Roux, et al.. Broadband Polarization Beam Splitter on a Silicon Nitride Platform for O-Band Operation. IEEE Photonics Technology Letters, Institute of Electrical and Electronics Engineers, 2018, 30 (19), pp.1679-1682. ⟨10.1109/LPT.2018.2866210⟩. ⟨hal-01940099⟩

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