The optical communication wavelength range high speed single-photon detector

摘要

In the optical communication wavelength band, it is intended to be operated at high speed single photon detector. InGaAs / InP avalanche photodiode (APD) 1, I bet the DC bias voltage 2 lower than the breakdown voltage. Superimposed on the DC bias voltage 2 and 3 of the gate signal sinusoid of frequency 500MHz, to exceed about 4V breakdown voltage at part of one cycle is added to APD1. I to remove the filter 4 and the gate signal of the sine wave 3 which has passed through the APD1. S / N is therefore good Torinozokeru almost completely contamination of the gate signal of 3 to 5 detection signal, it is possible to detect a single photon, even to shorten the time avalanche times. Therefore, it is possible to reduce the after-pulse, it is possible to shorten the detection period. In this way, it is possible to rapidly detect the single photon in the communication wavelength band of the wavelength of 1550nm.