posted on 2023-06-09, 03:52authored byPaul Struszewski, Mark Bieler, David Humphreys, Hualong Bao, Marco Peccianti, Alessia Pasquazi
We report the characterization of a balanced ultrafast photodetector. For this purpose, we use a recently developed time-domain laser-based vector network analyzer (VNA) to determine the common-mode rejection ratio (CMRR) of the 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 CMRR of better than 30 dB up to 70 GHz and better than 20 dB up to 110 GHz. The laser-based measurements are compared with the measurements using a digital sampling oscilloscope and with the 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.
Funding
UK Quantum Technology Hub for Sensors and Metrology; G1511; EPSRC-ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCIL; EP/M013294/1
History
Publication status
Published
File Version
Accepted version
Journal
IEEE Transactions on Instrumentation and Measurement