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Characterization of high-speed balanced photodetectors.

Struszewski, P*; Bieler, M*; Humphreys, D; Bao, H*; Peccianti, M*; Pasquazi, A* (2017) Characterization of high-speed balanced photodetectors. IEEE Trans. Instrum. Meas., 66 (6). pp. 1613-1620.

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We report the characterization of a balanced ultrafast photodetector. For this purpose we use a recently developed time-domain laser-based vector network analyzer to determine the common mode rejection ratio of device under test. This includes the frequency-domain response above the single-mode frequency of the coaxial connector. Although the balanced photodetector has a nominal bandwidth of 43 GHz, it generates voltage pulses with frequency components up to 180 GHz. We obtain a common mode rejection ratio of better than 30 dB up to 70 GHz and better than 20 dB up to 110 GHz. The laser-based measurements are compared to measurements using a digital sampling oscilloscope and to frequency-domain measurements using a conventional VNA. We obtain good agreement between the three techniques with the laser-based method providing the largest measurement bandwidth although it also constitutes the most complicated characterization setup.

Item Type: Article
Keywords: differential photodetector, common mode rejection ratio, electrooptic sampling
Subjects: Electromagnetics
Electromagnetics > Wireless Communications
Divisions: Engineering, Materials & Electrical Science
Identification number/DOI: 10.1109/TIM.2016.2647519
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/7571

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