A Comprehensive Performance Analysis of Direct detection Receivers in WDMA Systems

In this work the performance ofn wavele igth division multipic access (wdma) system with ircct detection receiveris investi at . ' 0 this purpose, t e prooabilif of error in a woma network with ook mod ilation consideringcrossta k, lsi, photo detector noise an thermal n ise is calculated and ill' effect of each on sy tern performance .sinvestigated, he system per orrnance in presence of pin ana t pd photo detectors are compared. besid the accuratecalculations () bit error nile, these calcu ations have also been performed using gau sian, chernoff bound and modifiedhernoff bound approximation ii rt h decision variable. results f ou calculari 11 of the photo detector m is ' p n itin presence pi and at> photo detectors arc pr nt iat d compared for different number r hannels. also, from thecalculations of th receiver - nsitivity, an optimum value for h avalanch gain of apd is obtained. die superiority ofapd ov i' pin photo d re rion is also demonstrated.