تصميم وتشغيل دائرة تضمين موقع نبضة لليزر أشباه الموصلات المستخدم في الاتصالات البصرية

Abstract

In this work. A PPM-PWM system designed. constructed and operated to be employed for modulation of semiconductor lasers used in optical communication system The simulation and experimental results–obtained from this work–showed that this modulation system has acceptable stability and reliability. this system is operated at low voltages and the output frequency can be controlled by according to the values of resistors and capacitors in the passing circuit connected to this system. This work is an attempt to design modulation systems and make them compact as the integrated circuit to be suitable for the modern optical communications architectures.