Integrated Microwave Photonic Spectral Shaping for Linearization and Spurious-Free Dynamic Range Enhancement

Gaojian Liu, Okky Daulay, Yvan Klaver, Roel Botter, Qinggui Tan, Hongxi Yu, Marcel Hoekman, Edwin J. Klein, David Marpaung

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Integrated microwave photonics (MWP) is a fast growing area where high frequency microwave signals are processed in the optical domain, merging key advantages of both microwave photonics and photonic integrated circuits (PICs) technologies including low-loss, reconfigurability, advanced functionality, enhanced stability, and reduced footprint. Plenty of functionalities have been demonstrated in integrated MWP, especially based on spectral shaping technique, where the phase and amplitude of the optical spectrum is precisely tailored by PICs. However, on-chip linearization is lagging behind and has not been investigated deeply. It is crucial and urgent to study on-chip linearization methods, which will lead to advanced integrated MWP systems with large spurious-free dynamic range (SFDR). In this paper, we present two novel techniques for on-chip linearization of microwave photonic links. The first technique is based on line-by-line complex spectral shaping using a series of ring resonators. The second technique relies on spatial separation to achieve parallel spectral shaping in two complementary spatial channels. Both methods are demonstrated in low-loss programmable silicon nitride circuits that can already host a number of advanced functionalities. Our results point to the great potential of integrating advanced functionalities and linearization in the same integrated platform.

Original languageEnglish
Article number3093201
Pages (from-to)7551-7562
Number of pages13
JournalJournal of lightwave technology
Volume39
Issue number24
Early online date29 Jun 2021
DOIs
Publication statusPublished - 15 Dec 2021

Keywords

  • Integrated microwave photonics
  • Integrated optics
  • linearization
  • Optical attenuators
  • Optical distortion
  • Optical fiber communication
  • Optical modulation
  • Optical polarization
  • Optical ring resonators
  • optical spectral shaping
  • spurious-free dynamic range

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