Liquid crystal-based tunable photodetector operating in the telecom C-band

Abstract : Liquid crystal (LC) microcells monolithically integrated on the surface of InGaAs based photodiodes (PDs) are demonstrated. These LC microcells acting as tunable Fabry-Perot filters exhibit a wavelength tunability of more than 100 nm around 1550 nm with less than 10V applied voltage. Using a tunable laser operating in the S and C bands, photocurrent measurements are performed. On a 70 nm tuning range covered with a driving voltage lower than 7V, the average sensitivity for the PD is 0.4 A/W and the spectral linewidth of the LC filter remains constant, showing a FWHM of 1.5 nm. Finally, the emission spectrum from an Er-doped fiber is acquired by using this tunable PD as a micro-spectrometer.
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Submitted on : Saturday, September 22, 2018 - 1:03:30 PM
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Christophe Levallois, Benattou Sadani, Benjamin Boisnard, Thierry Camps, Cyril Paranthoen, et al.. Liquid crystal-based tunable photodetector operating in the telecom C-band. Optics Express, Optical Society of America, 2018, 26 (20), pp.25952-25961. ⟨10.1364/OE.26.025952⟩. ⟨hal-01879162⟩

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