Jitter reduction in self-sustaining monostable clock recovery circuit

A simple circuit modification is presented for reducing the output jitter of the self-sustaining monostable multivibrator clock recovery circuit. Jitter is reduced by preventing the monostable multivibrator from being triggered by pulses that arrive early. Experimental results in a fibre-optic system employing the Petrovic code show that, with this modification, the jitter variance can easily be reduced by a factor of 6.     

Noise performance of separate absorption, grading, charge andmultiplication InP/InGaAs avalanche photodiodes

The noise performance of planar separate absorption, grading, charge and multiplication avalanche photodiodes was investigated at room temperature over a range of integrated charge (2.7-3.3×10¹² cm^-2) and high field InP thickness (0.09-0.62 μm). It is found that the effective k of 0.38 is nearly independent of these parameters. These observations are consistent with ionization both inside and outside the high-field InP region. Furthermore, the temperature dependence was investigated, with the result that k increases slightly from 0.42 to 0.53 with increasing temperature in the range -30 to +85°C