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The on-chip broadband optical spectrometers which cover the entire tissuetransparency window ({\lambda}=650-1050 nm) with high resolution are highlydemanded for the miniaturized bio-sensing and bio-imaging applications. Here,we propose a novel type of spatial heterodyne Fourier transform spectrometer(SHFTS) integrated with a sub-wavelength grating coupler (SWGC) for thedual-polarization bandpass sampling on the Si3N4 platform. Through tuning thecoupling angles with different polarization, we experimentally demonstrated theunprecedented broadband spectrum retrieval results with the overall bandwidthcoverage of 400 nm, bridging the wavelengths from 650 nm to 1050 nm, with theresolution of 2-5 nm. By applying the bandpass sampling theorem, wecircumvented the intrinsic trade-off limitation between the bandwidth andresolution of SHFTS without having an outrageous number of Mach-Zehnderinterferometer (MZI) arrays or adding additional active components. Thebandpass sampling SHFTS is designed to have linearly unbalanced 32 MZIs withthe maximum optical path length difference of 93 {\mu}m within an overallfootprint size of 4.7 mm x 0.65 mm, and the coupling angles of SWGC are variedfrom 0{\deg} to 32{\deg} to cover the entire tissue transparency window.

Dual-Polarization Bandwidth-Bridged On-Chip Bandpass Sampling Fourier Transform Spectrometer from Visible to Near-Infrared