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We calculate the amplitude-to-phase (AM-to-PM) noise conversion in a modifiedunitraveling carrier (MUTC) photodetector. We obtained two nulls as measured inthe experiments, and we explain their origin. The nulls appear due to thetransit time variation when the average photocurrent varies, and the transittime variation is due to the change of electron velocity when the averagephotocurrent varies. We also show that the AM-to-PM conversion coefficientdepends only on the pulse energy and is independent of the pulse duration whenthe duration is less than 500 fs. When the pulse duration is larger than 500fs, the nulls of the AM-to-PM conversion coefficient shift to larger averagephotocurrents. This shift occurs because the increase in that pulse durationleads to a decrease in the peak photocurrent. The AM-to-PM noise conversioncoefficient changes as the repetition rate varies. However, the repetition ratedoes not change the AM-to-PM conversion coefficient as a function of inputoptical pulse energy. The repetition rate changes the average photocurrent. Wepropose a design that would in theory improve the performance of the device.

Computational Study of Amplitude-to-Phase Conversion in a Modified Uni-Traveling Carrier (MUTC) Photodetector