دانلود رایگان مقاله انگلیسی انتقال سیگنال های چند بعدی برای سیستم های مخابرات نوری نسل بعدی - الزویر 2018

abstract

Over the past several decades, the data-carrying capacity of a single optical fiber have been increased significantly by fully exploring and optimizing physical dimensions of the light. Generally there are five major candidates of dimensions, including time, wavelength, polarization, space and quadrature (phase and amplitude). Multidimension, utilizing more than two dimensions of the light simultaneously, is one of the essential characteristics of next generation optical communication systems. We review recent advances in transmission of multidimensional signals, and highlight innovative ways of exploring the polarization dimension to further increase the capacity or spectral efficiency of a single optical fiber, a so-called pseudo-polarization-division-multiplexing (PPDM) technique. Related demonstrations include non-orthogonal PDM, PPDM of three and four states (PPDM3 and PPDM-4). Brief discussions on trends of multi-dimensional signal transmission technologies are also presented.

4. Discussions & Conclusion

Great advances has been made in multi-dimension signal transmission over the past several decades. Various innovative technological approaches have been developed, which significantly improve the overall capacity of a single optical fiber, as well as other figure-of-merits, such as reach, spectral efficiency and capacity-distance product. However, much more efforts need to be spent to optimize these approaches from the practical point of view and make system performance competitive with those of existing systems in terms of cost, reliability, operability and so on. As the growth of bandwidth requirements is endless, investigating the physical dimension limits for multi-dimension signal transmission over long-haul optical communication systems and seeking appropriate techniques to further breakthrough those limits are still a great challenge in future.