With the development and popularization of optical communication in recent years, optical fiber, which has low transmission loss in C band, has been broadly employed in all kinds of optical systems. It facilitates the applications in long-haul optical information transmission, whereas the signal attenuation as well as optical noise arises greatly in the fiber system. In this paper, we investigated the optical amplification effect of the Er:Yb co-doped fiber in a DBR fiber laser system. To increase the optical signal power, the analysis focusing on the relationship between laser power and system attenuation was also built up.
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