Abstract
In this chapter, we discuss recent advances in single-core and multicore optical fibers for increasing capacity for transmission systems. For single-core fibers for long-haul transmission, transmission impairments such as chromatic dispersion and polarization-mode dispersion can be compensated for by digital signal processing; therefore, the only fiber parameters that can be optimized further are fiber attenuation and effective area. We will discuss system figure of merit and design trade-offs for the two parameters and present recent results on ultralow loss and large effective area fibers. For next-generation fibers, multicore fibers for space division multiplexing have the potential to increase the capacity by an order of magnitude. We will present fiber design considerations and review recent progress on multicore fibers.
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