The achievement of single-channel 100 Gbit/s transmission, using linear unitravelling carrier photodiodes and QAM-16 modulation format is reported. The wireless link has been done in the indoor case, considering the recent frequency standardised 300 GHz bands. 'TERALINKS', ANR-DFG 'TERASONIC' projects. Part of the work was realised under an academic collaboration with Tektronix. In particular, a 50 GS/s arbitrary waveform generator (Tektronix AWG70001A) and 200 GS/s real-time oscilloscope (Tektronix DPO77002SX) were used. We also thank the IEMN, characterisation centre, IEMN-IRCICA Telecom platform facilities. This work is supported by the CPER 'Photonics for society', and contribute the 'digital world' Hub 3 of the

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We show that photoconductors based on low-temperature-grown GaAs (LT-GaAs) can be efficiently operated by 1.55 μm telecom wavelength by using metallic mirror based optical cavities. Two different semi-transparent front mirrors are compared: the first one is a thin gold layer, whereas the second one consists of a gold grating. Light absorption in grating mirror based optical cavities is numerically, analytically, and experimentally investigated allowing for an appropriate optical design. We show a 3 times improvement of the LT-GaAs photoconductor photoresponse by using, as front mirror, the gold grating once compared with the thin gold layer. It reaches around 0.5 mA/W under continuous wave, whereas a transient photoresistivity (Ron) as low as 5 Ω is deduced from dc photocurrents measured under femtosecond pulsed laser excitation. This work paves the way to efficient and reliable optoelectronics systems for GHz or THz waves sampling driven by 1.55 μm pulsed lasers widely available.