Approaching the Capacity of Colored-SNR Optical Channels by Multicarrier Entropy Loading

Abstract

Fiber optics channels provide flat channel response per wavelength in general, owing to the ultrawide available bandwidth of optical fibers and optical amplifiers. However, the recent transport capacity upgrade, which drives the signal baud-rate from 10 to >100 Gbaud, has given rise to severe power fading at high-frequency ranges, induced at levels of both optoelectronic transceivers and optical networks. Especially, the modern meshed optical networks rely on more and more reconfigurable optical add and drop multiplexers (ROADM) to enhance the network flexibility with low latency. These cascaded ROADMs bring about a well-known filter-narrowing effect that has become a severe issue in the dep..