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Radio frequency spectrum analyzer with a 5 THz bandwidth based on nonlinear optics in a CMOS compatible high-index doped silica waveguide

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arxiv 2103.10557 v1 pith:7SLPTA7L submitted 2021-03-18 physics.optics physics.app-ph

Yuhua Li , Zhe Kang , Kun Zhu , Shiqi Ai , Xiang Wang , Roy R. Davidson , Yan Wu , Roberto Morandotti
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Brent E. Little David J. Moss Sai Tak Chu
This is my paper · ORCID
classification physics.opticsphysics.app-ph
keywords spectrumanalyzerbandwidthdispersiondopedhigh-indexopticalsilica
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We report an all-optical radio-frequency (RF) spectrum analyzer with a bandwidth greater than 5 terahertz (THz), based on a 50-cm long spiral waveguide in a CMOS-compatible high-index doped silica platform. By carefully mapping out the dispersion profile of the waveguides for different thicknesses, we identify the optimal design to achieve near zero dispersion in the C-band. To demonstrate the capability of the RF spectrum analyzer, we measure the optical output of a femtosecond fiber laser with an ultrafast optical RF spectrum in the terahertz regime.

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