Abstract
AbstractThe effects of random multiplication gain of the photodetector on signal‐to‐noise ratios (SN) and error rates of noise‐like optical signal which obeys Gaussian distribution have been analyzed. By assuming the avalanche photodiode as the photodetector and adopting McIntyre's equation in the probable multiplication, the clearly special feature of the probability distribution of the detected output photoelectron counts of the noise‐like optical signal has been demanded. Next, considering the additional noise of background radiation and thermal noise, SNR and error rates have been analyzed for the avalanche photodiode. In these analyses, the optimum gain which gives the maximum SNR or the minimum error rate, is also derived with some physical meanings.
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