Fiber coupled THz QTDS at 1550 nm

We present a THz quasi time-domain spectroscopy (QTDS) system based on fiber coupled antennas operating at 1550 nm excitation wavelength. Frequency components up to 950 GHz can be generated with this setup. The signal to noise ratio of a single shot measurement is around 60 dB between 40 GHz and 240 GHz.