Polarization-insensitive silicon nitride Mach-Zehnder lattice wavelength demultiplexers for CWDM in the O-band

J. Mikkelsen (1) , A. Bois (1) , T. Lordello (1) , D. Mahgerefteh , S. Menezo (2) , J. Poon (1)

1 University of Toronto
2 DOPT - Département d'Optronique

Polarization-insensitive silicon nitride (SiN) 4-channel wavelength (de)multiplexers based on Mach-Zehnder interferometer lattice filters for coarse wavelength division multiplexing (CWDM) in the O-band are demonstrated in a SiN-on-silicon photonic platform. For the bestperforming device, the insertion loss was < 2.8 dB, the inter-channel crosstalk was < -11.5 dB for a polarization scrambled input, and the passband shift between the orthogonal polarizations was < 1.5 nm. Across the 200mm wafer, the die-averaged insertion loss and maximum crosstalk were 3.1 dB and -10.6 dB, respectively. The higher-than-expected crosstalk was due to dimensional variations. This work shows the potential of SiN photonic circuits forCWDMwithout polarization diversity.

Keywords: Photonics; Filters; AWG

Domains: Engineering Sciences [physics]

J. Mikkelsen, A. Bois, T. Lordello, D. Mahgerefteh, S. Menezo, et al.. Polarization-insensitive silicon nitride Mach-Zehnder lattice wavelength demultiplexers for CWDM in the O-band. Optics Express, 2018, 26 (23), pp.30076. ⟨10.1364/OE.26.030076⟩. ⟨cea-02184429⟩