# Homework7 - Optical Communication Components and Subsystems...

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Optical Communication Components and Subsystems ECE 565 Spring 2005 Homework 7 Assignment due date: Monday, April 4, 12:30 PM From the text: Problems 4.9, 4.12, 4.13, 4.16, 4.17 Special Problem: see next page

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Special Problem 1. This problem is related to intersymbol-interference (ISI) noise in on-oﬀ- keying, direct detection optical communication. Consider a train of n optical pulses arriving at an optical receiver. These pulses represent n bits of binary information (consisting of zeros or ones). Let P ( t ) denote the received optical power as a function of real time, t . If each bit is allowed to occupy T B seconds and if all types of pulse broadening in the ﬁber are neglected, then we can represent P ( t ) as P ( t ) = n X k =0 P k q ( t - kT B ) , (1) where for each k , q ( t - kT B ) is a rectangular pulse of unity hight that starts at t = kT B and ends at t = ( k + 1) T B . For simplicity, assume that for each k , the pulse intensity P k is either 0 W or 1 W, corresponding to the absence or presence of a pulse, respectively. According to a shot-noise model for the photocurrent, the receiver photocurrent (output)
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Homework7 - Optical Communication Components and Subsystems...

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