Abstract
This paper is focused on applying a polarization multiplex to passive optical networks to double their transmission bandwidth without significant changes in the distribution network. Although polarization multiplexes are already employed for high-speed optical transport networks with digital signal processing and coherent detection, we propose a system that could be used in existing older optical networks using a dynamic polarization controller in combination with a wavelength division multiplex.
Highlights
IntroductionPOL-MUX system was the subject of research mostly in the 1990s and plenty of research groups were interested in this topic
The output multiplexed signals from OLT1 and OLT2 were modified by polarization controllers PC1 and PC2 for optimal multiplexing by polarization splitter PBS1, e.g., the signal from one OLT must be parallel to one of the axes of polarization plane x, and the signal from the second OLT must be parallel with the polarization plane y of polarization beam splitter PBS2
There are several ways to extend the bandwidths of optical networks, but many of these approaches are difficult to employ in existing distribution networks
Summary
POL-MUX system was the subject of research mostly in the 1990s and plenty of research groups were interested in this topic It allows doubling of bandwidth and brings many advantages in comparison with other known multiplexing techniques, due to difficult demultiplexing, it was no longer prospective for further development, and WDM systems played the main role in the field of optical networks for many years [8,9,10,11,12,13]. The renaissance came after 2000, when the group of Yao et al [5,6] engaged in research of POL-MUX systems using an all-optic scheme for polarization demultiplexing It was not employed in optical data networks and real a comeback occurred with the development of coherent high-speed networks with direct detection system, digital signal processing and multistate modulation formats.
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