Abstract
A low-noise photodetector is a basic tool for the research of
quantum information processing. We present a specially designed low-noise
photoelectric detector with a bandwidth of 130 MHz, using a transimpedance
amplification circuit. Based on the detailed calculation of the dependence
on each parameter of the detector, a useful method of how to design a
low-noise and broadband photodetector is provided. When the optical power
is between 1.0 and 16 mW, the photodetector has a good linear response to
the injected light. Its electronics noise power is below −77 dBm, which is
within the whole bandwidth. When the incident light power is 2 mW, the
output noise powers are 10.0, 8.0, and 6.0 dB higher than the
corresponding electronics noise within the bandwidth of 1–50, 50–90, and
90–130 MHz, respectively, which is in good agreement with the theoretical
prediction. Thus, this photoelectric detector could have good application
prospects in quantum communication and an optical cavity locking
system.
© 2016 Chinese Laser Press
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