Abstract
Optical communication systems are now widely spread over the entire earth. The world-wide link of optical fibers for signal transfer is more than 10,000 km. Even though the loss of optical fibers is as low as 0.2 dB/km, the loss over a long distance is still substantial. Therefore, the optical signals must be amplified after they propagate in the fiber for significant distances. The traditional way to amplify the optical signal is to convert the optical signal back to an electronic signal first, then amplify the signal in the electronic domain. The amplified electronic signal is then converted back into an optical signal again and delivered into the optical fiber. The block diagram of process is shown in Fig. 4-1.
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Lin, CF. (2004). Optical Amplifiers. In: Optical Components for Communications. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-4178-0_4
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DOI: https://doi.org/10.1007/978-1-4757-4178-0_4
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