Algebraic cancellation of inter-channel cross talk in multiplexed heterodyne interferometry

Anneshwa Dey*, Ya Zhang, Justin Wong, Paul G. Sibley, Chathura P. Bandutunga, Malcolm B. Gray, Jong H. Chow

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)

    Abstract

    We demonstrate the algebraic cancellation of residual phase cross talk in digitally enhanced heterodyne interferometry (DEHeI), a code division multiplexing technique for interferometric sensing. By using linear combinations of parallel decoding operations at multiple delays, we synthesize a zero correlation for spurious signals and remove phase cross talk: a method we call offset decoding. We experimentally demonstrate 70 dB of signal isolation and over 40 dB greater isolation than the equivalent standard implementation of DEHeI.

    Original languageEnglish
    Pages (from-to)583-5833
    Number of pages5251
    JournalOptics Letters
    Volume46
    Issue number23
    DOIs
    Publication statusPublished - 1 Dec 2021

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