Title :
Performance analysis of CDMA optical communication systems with avalanche photodiodes
Author :
Ho, Chia-Lu ; Wu, Cheng-yu
Author_Institution :
Dept. of Electr. Eng., Nat. Central Univ., Chung-Li, Taiwan
fDate :
6/1/1994 12:00:00 AM
Abstract :
The performance of optical code-division multiple-access (CDMA) communication systems with avalanche photodiodes (APD) is analyzed. The bit error rate (BER) can be accurately computed by using the saddlepoint method. The effects of the multiple-user interference (MUI), signal-dependent shot noise, and receiver thermal noise are investigated. Results of the numerical integration illustrate the non-Gaussian property of the receiver output distribution. Exact means and variances are derived for the Gaussian approximation. It is found that when the MUI increases, the saddlepoint approximation yields satisfactory results, but the Gaussian approximation yields higher BER floors. Prime codes and on-off keying (OOK) are considered. Examples illustrate the effects of the system parameters such as the APD gain, threshold, prime code length, and the number of simultaneous users
Keywords :
avalanche photodiodes; code division multiple access; encoding; on-off control; optical links; optical receivers; random noise; APD gain; CDMA optical communication systems; Gaussian approximation; OOK; avalanche photodiodes; bit error rate; multiple-user interference; nonGaussian property; numerical integration; on-off keying; optical code-division multiple-access; performance analysis; prime code length; prime codes; receiver output distribution; receiver thermal noise; saddlepoint approximation; saddlepoint method; signal-dependent shot noise; simultaneous user number; system parameters; threshold; Avalanche photodiodes; Bit error rate; Current distribution; Gaussian approximation; High speed optical techniques; Multiaccess communication; Optical fiber communication; Optical noise; Optical receivers; Performance analysis;
Journal_Title :
Lightwave Technology, Journal of
