Five hot spots in the field of optical communication technology

- Feb 13, 2017-

As IP business continued exponential growth, reform of the telecommunications regulatory framework, as well as the gradual full liberalization of the telecommunications market; optical communications will gradually replace the traditional technology of switching, transmission, access, and ultimately all-optical networking. This paper focuses on five development focus in the field of optical communications ultra high-speed transmission systems, optical transport network technology, a new generation of fiber-optic, IP over Opticall and optical access network technology described their current situation of overseas research and commercial points out that China's research and development in optical communications. Ultra high-speed time division multiplexing optical transmission system development based on commercial system has increased from 45Mbit/s to 10Gbit/s; increase in rate over 2O years 2000 times. 10Gbit/s system has started in North America, Europe, Japan and Australia, large quantities of equipment and applications. China will also begin field tests in the near future. Is in need of attention; 10Gbit/S more sensitive systems for optical polarization mode dispersion and optical cables have been laid may or may not be able to meet the opening and use the 10Gbit/S system requirements need to be opened after passing the practical test in order to install.

In theory, these TDM-based high speed rates are also expected to improve, such as transmission rate can be achieved in the laboratory 4OGbit/s, chromatic dispersion and polarization mode dispersion compensation and pseudo ternary system, (namely two-binary) encoding has been able to travel 100 km. However, using time division multiplexing to improve transmission capacity is close to silicon and gallium-arsenic technical permissions, in addition to the 40Gbit/s or higher-rate time-division multiplexing system in the price/performance ratio and whether it will succeed is uncertain in a practical and therefore more realistic solution is to turn to optical multiplexing. Optical multiplexing optical TDM, wavelength division multiplexing (WDM), frequency-division multiplexing; but only wavelength division multiplexing in the large-scale commercial stage; but the other is still at the study stage. Large-capacity wavelength division multiplexing system using time division multiplexing of speech the expansion potential of the system have been exhausted; fiber 200nm of available bandwidth, however only use less than 1%; 99% resources have yet to be discovered. If sending multiple wavelengths be staggered in light signals in fiber transmission, you can greatly increase fibre information transmission capacity; this is the wavelength division multiplexing (WDM) ...

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