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发表于 2006-6-2 12:35:00
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【文件名】:0662@52RD_cha10-12.rar
【格 式】:rar
【大 小】:814K
【简 介】:In optical communication systems, a weak optical signal attenuated by fiber loss is amplified by an optical linear amplifier before the signal is detected by a photodetector and electronically regenerated. An optical amplifier adds extra noise on the signal and thus the signal-to-noise (S/N) ratio of the optical signal wave is degraded. However, an electronic regeneration circuit has much higher thermal noise than the noise generated in an optical amplifier; thus, the use of an optical amplifier improves the overall S/N ratio.
【目 录】:
Chapt10
Chapt11
Chapt12
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