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SC IJPE 08
Qun Zhang and Han-Way HuangDepartment of Electrical & Computer Engineering & Technology, Minnesota State University, Mankato, MN 56001, USA
Received on: August 7, 2007
In this short communication, we investigate how to extend the Guassian approximation method for performance evaluation of systems, from traditional optical on-off keying (OOK) systems to the emerging optical differential phase shift keying (DPSK) systems. We employ a recently developed Karhunen-LoÃ©ve series expansion (KLSE) method to accurately calculate the exact probability density function (pdf) of the detected photo voltage for typical DPSK transceivers, and approximate the derived pdf by Gaussian pdf. The Q-factor obtained by using the Gaussian pdf can then be corrected by comparing it to the exact result. The proposed method can be used to guide efficient numerical estimate as well as experimental measurement of the noise-loading back-to-back DPSK system performance where the inter-symbol-interference (ISI) is not significant.
Status: Published in Vol. 3, No 4, October 2007. pp. 501-503