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Broadband, Polarization-Insensitive Fourier Transform Spectrometer Based on Thin-Film Lithium Niobate Photonics
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DOI：10.1002/lpor.71403.png)
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Abstract
En 中文
Miniaturized Fourier transform spectrometers are pivotal for emerging applications in chemical sensing, biomedical diagnostics, and environmental monitoring. However, achieving broadband and polarization-insensitive operation on a chip remains challenging. This work reports a thin-film lithium niobate-based Fourier transform spectrometer that overcomes this limitation via a polarization-diversity architecture integrating edge couplers, broadband polarization splitters–rotators, and a Mach–Zehnder interferometer. The device operates over a 340-nm bandwidth (1260–1600 nm) with a spectral resolution of 1.8 nm at 1550 nm. It enables high-speed spectral acquisition with a 50-µs acquisition time and an energy consumption of 4.59 µJ per acquisition. This work brings integrated Fourier transform spectrometers significantly closer to practical deployment in compact, low-power, and polarization-independent photonic systems.
Keywords:
Fourier transform spectrometer
high-speed spectroscopy
on-chip
polarization-insensitive
thin-film lithium niobate
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10
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1.1K
Citations:
1
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