Integrated ammonia sensor using a telecom photonic integrated circuit and a hollow core Fiber

Andreas Hänsel*, Abubakar Isa Adamu, Christos Markos, Anders Feilberg, Ole Bang, Martijn J.R. Heck

*Corresponding author for this work

    Research output: Contribution to journalLetterpeer-review

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    We present a fully integrated optical ammonia sensor, based on a photonic integrated circuit (PIC) with a tunable laser source and a hollow-core fiber (HCF) as gas interaction cell. The PIC also contains a photodetector that can be used to record the absorption signal with the same device. The sensor targets an ammonia absorption line at 1522.45 nm, which can be reached with indium phosphide-based telecom compatible PICs. A 1.65-m long HCF is connected on both ends to a single-mode fiber (SMF) with a mechanical splice that allows filling and purging of the fiber within a few minutes. We show the detection of a 5% ammonia gas concentration, as a proof of principle of our sensor and we show the potential to even detect much lower concentrations. This work paves the way towards a low-cost, integrated and portable gas sensor with potential applications in environmental gas sensing.

    Original languageEnglish
    Article number93
    Issue number4
    Number of pages10
    Publication statusPublished - Dec 2020


    • Hollow core fibers
    • Indium phosphide
    • Optical gas sensor
    • Photonic integrated circuit


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