An athermal delay interference circuit using trenches filled with low-refractive index material

Kenji Iwamoto, Jiro Ito, Hiroyuki Tsuda

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    Abstract: Recently, various types of silica-based planar lightwave circuits (PLCs) have been used for optical networks. However, silica exhibits large temperature dependence, so the temperature of silica- based PLCs needs to be controlled. We can reduce the cost and the energy budget of optical equipment by using athermal waveguides. We propose an athermal optical waveguide comprised of trenches filled with low-refractive index material. The propagation constant of the waveg- uide is determined by the refractive indices of the core and the low- refractive index material; their thermo-optic coefficients have opposite signs, and therefore the temperature dependence of the waveguide can be suppressed. A 1-bit delay circuit was designed for a 12.5Gbit/s dif- ferential phase shift keying receiver using the athermal waveguide, and it displayed a wide operating temperature range.

    Original languageEnglish
    Pages (from-to)1769-1773
    Number of pages5
    JournalIEICE Electronics Express
    Volume6
    Issue number24
    DOIs
    Publication statusPublished - 2009 Dec 25

    Keywords

    • Athermal optical waveguide
    • Delay interference circuit
    • Differential phase shift keying

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Electrical and Electronic Engineering

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