4.7 Article

Integrated polarization-independent optical isolators and circulators on an InP membrane on silicon platform

Journal

OPTICA
Volume 8, Issue 12, Pages 1654-1661

Publisher

OPTICAL SOC AMER
DOI: 10.1364/OPTICA.443097

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Funding

  1. Nederlandse Organisatie voor Wetenschappelijk Onderzoek
  2. China Scholarship Council

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This paper demonstrates an integrated polarization-independent device that can function as an optical isolator or optical circulator, providing high optical isolation performance and advancing towards multifunctional and high-density PICs.
In photonic integrated circuits (PICs), optical isolators and circulators are essential to prevent lasers from backreflections and to reroute the light flow. In this paper, an integrated polarization-independent device that can be operated as an optical isolator or an optical circulator, based on an InP membrane on silicon platform, is demonstrated. A cerium-doped yttrium iron garnet die is adhesively bonded on a Mach-Zehnder interferometer, in combination with four polarization converters. The device shows maximum optical isolations of 27.0 dB for transverse-electric (TE)-mode input and 34.0 dB for transverse-magnetic TM-mode input. The device also works as a four-port optical circulator. Optical isolations of at least 18.6 dB and 16.4 dB are measured between each circulator port pair for TE- and TM-mode input, respectively. This work could remove the optical interfaces between laser and isolator for robust production. It also provides a step forward toward a multifunctional and high-density PIC. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

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