A SH laser diode is to be used for high-speed communications. It must be operated with no dc bias, and in a pulsed mode with no more than a 5% duty cycle, and a pulse width of 0.8 ns. The threshold...

A SH laser diode is to be used for high-speed communications. It must be

operated with no dc bias, and in a pulsed mode with no more than a 5% duty

cycle, and a pulse width of 0.8 ns. The threshold and peak currents are 100 mA

and 7 A, respectively. The spontaneous electron lifetime in the device is 60 ns.

(a) What factor(s) limit the maximum modulation rate?

(b) What is the maximum pulse repetition rate that can be used?