Performance evaluation of PIN plus OA and APD receivers in multi-wavelength CDMA and WaCDMA networks

In this paper, the performance of multi-wavelength optical orthogonal code division multiple access (MWOCDMA) communication network and hybrid wavelen gth code division multiple access (WaCDMA) network are investigated. In bot h the networks, transmitted signal is coupled into a dispersion shifted fib er (DSF) which in turn is coupled to either a PIN + OA or an APD receiver. The expression for probability of error for the above receiver configuratio ns in MWOCDMA and WaCDMA networks are derived taking into consideration var ious sources of receiver noise, multiple user interference and four wave mi xing (FWM) effects. It is observed that for a given number of users, MWOCDM A networks with PIN + OA receiver and WaCDMA networks with APD receiver are preferred to achieve a required performance. Further, the former give impr oved performance as compared to the latter with the level of improvement de pending upon the number of users for which the network is to be designed. T his is valid for all values of link loss. However, at higher values of link loss, FWM effect becomes dominant since the transmitted power is high and it leads to a smaller range of input transmitted power levels for a given n umber of users and performance requirement. (C) 2001 Published by Elsevier Science B.V.