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Development And Actuality Of Optical Fiber Communication Technology Apr 14, 2017

The emergence and development of optical fiber communication is an important revolution in telecommunication history. Fiber optics from the proposed theory to the technical realization and today's high-speed optical fiber communication is also only decades of time. From the development of foreign countries we can see that in the mid 1960 of the 20th century, the development of the best fiber loss in 400 db above, 1966 British Institute of Standard Telecom Charles Kao and Hockham theoretically predicted that fiber loss can be reduced to 20 db/kilometer below, Japan in 1969 developed the first communication with fiber loss of 100 decibels/kilometers, 1970 Corning Company (Corning) using "Powder method" A low loss quartz fiber with less than 20 decibels/kilometres and 4 db/kilometers, 1974 Bell Labs (Bell) improved the performance of the chemical vapor deposition method is superior to Corning's fiber products. By 1979, the loss of germanium doped quartz fibers in 1.55 kilometers has fallen to 0.2 decibels/kilometers, which is already very close to the theoretical loss limit of quartz fibers determined by Rayleigh scattering.
At present, the domestic fiber optic cable production overcapacity, oversupply. Special optical fibers such as FTTH still need to import, but the total amount is small, domestic production of fiber optic cable prices and the international market no difference, the cost can no longer fall, is already zero profit, in the international market is not too competitive, export volume is very small. Two major developments of light technology in the past 20 years, WDM and PON, both are relatively mature. Multi-Service Transmission Development Platform two aspects, on the one hand, is more effective to host Ethernet business, data business, on the other hand to business development. The current situation of AS0N is that the system is only in the device, or in the network, but some of the core functions have not been achieved.