[PDF][PDF] Advanced Signal Processing for Fiber-Optic Communication Systems Scaling Capacity Beyond 100 Tb/s

K Shibahara - 2017 - repository.kulib.kyoto-u.ac.jp
K Shibahara
2017repository.kulib.kyoto-u.ac.jp
Started from the first attempt to exploit light as a means to transmit information by Alexander
Graham Bell in 1880 (known as “photophone”), a number of considerable improvements
have contributed to developments in communication networks. The intensive research on
networks over optical fiber cables was driven by the invention of light emitting by stimulated
radiation (LASER) in the early 1960s, and by the low-loss optical fiber concept in 1966. By
the beginning of 1980, fiber-optic networks was introduced in UK, the US, and Japan with …
Started from the first attempt to exploit light as a means to transmit information by Alexander Graham Bell in 1880 (known as “photophone”), a number of considerable improvements have contributed to developments in communication networks. The intensive research on networks over optical fiber cables was driven by the invention of light emitting by stimulated radiation (LASER) in the early 1960s, and by the low-loss optical fiber concept in 1966. By the beginning of 1980, fiber-optic networks was introduced in UK, the US, and Japan with the system capacity up to 100 Mb/s. Over the last three decades, the system capacity using single-mode fiber (SMF) has increased by six orders of magnitude due to the technological breakthroughs in electronics/optoelectronics and signal processing techniques including electrical time division multiplexing, wavelength division multiplexing in conjunction with optical amplification, and digital coherent transmission. However, recent theoretical studies pointed out that the existing SMF-based fiber-optic systems cannot support the system capacity beyond 100 Tb/s per fiber. Currently, the information capacity resources of SMF-based fiber-optic systems are exhausted at an astonishingly rapid rate, and the capacity crunch might be coming in sight by the mid-2020s. A new multiplexing technologies with spatiallystructured fibers may offer solutions against the capacity limit. This approach—known as spatial division multiplexing (SDM)—has attracted considerable attention worldwide from the late 2000s, although developments in both SDM signal transmission and SDM devices are still open issues for practical applications of SDM transmission systems. On the other hand, from the standpoint of industrial market maturity, a cost-effective solution to enhance the system capacity until the capacity crunch is to continuously exploit transmission technologies on SMF-based fiber-optic systems.
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