OPTICAL ORTHOGONAL CODE DIVISION MULTIPLE ACCESS SYSTEM PART Ⅰ:WITH APD NOISE AND THERMAL NOISE

摘要

In an optical multipie access system,overall system throughput efficiency as well as significant implementation cost-reduction would be achieved if many users could access a common optical channel at any time without control among users.Recently one such scheme,namely,an optical orthogonal-code-division multiple access system(OOCDMA),was introduced[1-6] for the case of no avalanche photodiode(APD)noise and no thermal noise.In this paper,some extensions of the work in Ref.2 will be presented,including the effects of APD and thermal noise as well as interference for the OOCDMA directdetection receiver with an APD.In addition,the hardlimiter role beforle the receiver correlafor in the presence of thermal and APD noise will also be examined.