APPARATUS FOR GENERATING PULSE TRAIN COMPRISING SEVERAL SYNCHRONOUS OPTICAL PULSES CONTAINING ONE PHOTON AT MAXIMUM IN AVERAGE RESPECTIVELY FROM SINGLE LIGHT IMPULSE OF SHORT DURATION AND MEASURING APPARATUS FOR INSTANTANEOUS WAVEFORM OF SINGLE LIGHT IMPLUSE IN USE THEREOF

摘要

PURPOSE: To enable the observation of the instantaneous waveform of a single light pulse by generating a synchronizing light pulse train from a short-duration single light pulse. CONSTITUTION: Loops I1 , I2 ... In In with both ends closed are formed of monomode fibers and coupled in pairs of two by directional light couplers 212 , 223 .... Directional light couplers 31 and 3n are used to connect the loop I1 to input circuits 4 and 7 and the loop In to output circuits 5 and 8. Then a light source emits the initial pulse of light, its small portion heads for the loop I and a portion of photons heads for the loop I2 every time photon flux passes through the coupler 2. The loops I1 and I2 stock time photons with a minimum of density decreases and periodically emit a portion of the photon flux, and photons circulate in the directions of arrows 61 , 62 .... A histogram 28 is made by plotting generating time tj , tm ... as the abscissa and photons detected each time as the ordinate, and then the approximate waveform of an initial single light, pulse can be constructed by its envelope.