Slot-Waveguide Based All-Optical RF Spectrum Analyzer

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Zhe Kang
  • Roy R. Davidson
  • Brent E. Little
  • Kun Zhu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number1380
Number of pages10
Journal / PublicationPhotonics
Volume10
Issue number12
Online published15 Dec 2023
Publication statusPublished - Dec 2023

Link(s)

Abstract

All-optical radio-frequency spectrum analyzers (AORFSAs) with ultrabroad bandwidth break the electronic bottleneck and provide an efficient frequency analysis means for ultrafast optical signals in communications, signal generation and processing systems. Here, we propose and experimentally demonstrate an AORFSA built on the cross-phase modulation effect in a 50 cm long CMOS-compatible photonic slot-waveguide. The waveguide has a 100 nm thick thin-film core of fused silica that is sandwiched by two 750 nm thick cladding layers of high-index doped silica, which shows optimized dispersion and comparable nonlinear characteristics. The measured 3 dB bandwidth of the proposed slot-waveguide-based AORFSA has a three-fold increase over the conventional channel waveguide having the same dimension and length. The sensitivity and wavelength- and polarization-dependence properties are investigated, confirming the proposed waveguide as a versatile platform for frequency analysis of ultrafast optical signals, such as Kerr microcombs with hundreds of GHz or even THz mode spacing. © 2023 by the authors. Licensee MDPI, Basel, Switzerland.

Research Area(s)

  • nonlinear optics, optical signal processing, slot-waveguides, radio-frequency (RF) spectrum analysis

Citation Format(s)

Slot-Waveguide Based All-Optical RF Spectrum Analyzer. / Li, Yuhua; Kang, Zhe; Ho, Wai-Lok et al.
In: Photonics, Vol. 10, No. 12, 1380, 12.2023.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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