This document presents a MATLAB Simulink model of a QPSK modulated reusable UWB-based optical network. Key aspects include:
1) The model simulates a WDM PON system using QPSK modulation to transmit data over single mode fiber, with and without wavelength reuse from downstream UWB signals.
2) System performance is evaluated by measuring BER and SNR over increasing fiber lengths.
3) Results show that wavelength reuse does not degrade performance, as SNR and BER values closely resemble the non-reuse method over transmission lengths up to 40,000km.
4) The study demonstrates an effective method for wavelength reuse in optical networks to reduce implementation costs without compromising performance.