Title :
Signal-to-noise ratio for lightwave systems using avalanche photodiodes
Author :
Hakim, Nagib Z. ; Saleh, Bahaa E A ; Teich, Malvin C.
Author_Institution :
Dept. of Electr. Eng., Columbia Univ., New York, NY, USA
fDate :
3/1/1991 12:00:00 AM
Abstract :
An expression for the signal-to-noise ratio (SNR) at the output of an avalanche photodiode (APD) receiver is derived that includes the effects of photoinjected carriers, dark-generated carriers, and the receiver circuitry. It is found that the dark current alters both the magnitude of the SNR and the value of the mean multiplication where the SNR achieves its maximum value. The formula differs from the expression that is conventionally used (S.M. Sze, 1981) in that it makes use of different excess noise factors for photo-generated and dark-generated carriers
Keywords :
avalanche photodiodes; electron device noise; optical communication equipment; receivers; APD receiver; avalanche photodiodes; dark current; dark-generated carriers; excess noise factors; lightwave systems; mean multiplication; photo-generated carriers; photoinjected carriers; receiver circuitry; signal-to-noise ratio; Avalanche photodiodes; Circuit noise; Dark current; Electron optics; Noise generators; Optical detectors; Optical noise; Optical receivers; Signal detection; Signal to noise ratio;
Journal_Title :
Lightwave Technology, Journal of
