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All-fiber Integrated In-line Semiconductor Photoconductor

Lühder, Tilman; Plentz, Jonathan; Kobelke, Jens; Wondraczek, Katrin; Schmidt, Markus A.
in: Journal of Lightwave Technology (2019) 3244

Here, we present a fully fiber-integrated semiconductor wire based photoconductor for the photodetection of light at visible and near-infrared wavelengths. The device consisting of an electrically connected micrometer sized germanium wire running parallel to a single-mode core of a gradient index fiber shows features such as temporal responses shorter than 20 ns and a linear response between 10 nW and 20 µW in the wavelength domain between 600 nm and 1300 nm, while light powers up to 2 mW can be measured. A sophisticated polarization dependency has been revealed, showing a non-intuitive dependence on wavelength and light power that has been explained by a developed model. Due to its design flexibility our electrically connected semiconductor enhanced fiber concept principally allows to detect a defined fraction of light, while the remaining part is still available for further diagnostics, thus defining a novel type of detection scheme for all-in-fiber optoelectronic light detection.

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