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drawing process and optical cable construction condition, and the fiber drawing length is limited ( such as 1Km ). Therefore, a fiber optic line may exist a plurality of optical fiber connection problems. Then, the connection between the optical fiber and optical fiber, optical coupling and coupling of optical fiber connectors, couplers, and passive devices use is essential. Four. The future development trends of optical fiber

communication

At present, in the field of optical communication technology development of hot ultra high speed transmission system, large

capacity WDM system, optical transmission network technology, a new generation of optical fiber, IPoverOptical and optical access network technology.

( 1) to the high speed system development

The current 10Gbps system has been applied to a large number of network. The 10Gbps system for optical fiber polarization mode dispersion is more sensitive, and has laid the cable and can meet up and use 10Gbps system, before opening to the actual test, unvalidated before installation of the opening. It is the development direction of the steering light multiplexing mode. An optical way has many kinds, but at present only the wavelength division multiplexing ( WDM ) is a large-scale commercial, while the other way is still in the stage of experimental study.

( 2) to the large capacity WDM system evolution

Electricity time division multiplexing system capacity limitation is very big, and the optical fiber 200nm available bandwidth resources only with utilization rate of less than 1%, there are 99% resource has not been utilized. If multiple wavelength light signal at the same time in a single core fiber transmission, can

greatly increase the fiber information transmission capacity, this is the wave division multiplexing ( WDM ) is the basic train of thought. Based on the WDM in last few years the major

breakthrough on the technology and market is tremendous drive, wavelength division multiplexing system development is very rapid. The current global practical pavement WDM system has more than 3000, and the practical system for maximum capacity already amounted to 320Gbps ( 2 x 16 x 10Gbps ). Laboratory of the highest level have reached 2.6Tbps ( 13 * 20Gbps ). Is expected in the near future, the practical capacity of the system can achieve 1Tbps level.

( 3) to realize optical networking

The utility of WDM system despite the great transmission

capacity, but basically is based on point to point communication system, its flexibility and reliability are also not ideal. If in the light path can achieve a similar SDH in circuit of transplanting function and cross connect function words, will add a new layer of power. According to this one main train of thought, optical networking not only can achieve large capacity optical network, but also can satisfy the network nodes and the continuous

increase in business volume and interconnecting any system and different system signal.

Optical networking has become the SDH and power network after another new development climax of optical communication. The construction of a maximum transparent, highly flexible and large capacity of the national backbone optical network, not only for the future of the national information infrastructure ( NJJ ) to lay a solid foundation, but also to our country first Century the information industry and national economy

development and national security have the extremely important strategic sense.

( 4) the development of a new generation of optical fiber

The traditional G.652 single-mode fiber in adapting to the high speed long distance transmission network development needs has exposed many shortcomings, research and development of new fiber has become the next generation of network

infrastructure is an important component of. At present, in order to adapt to the backbone and man 's different development needs, has appeared two kinds of novel optical fiber, namely non-zero dispersion ( G.655 fiber ) and percutaneous absorption peak fiber ( all wave fiber ). Among them, all wave fiber will be the

development focus, is also a research hotspot now. From a long-term point of view, BPON technology will be the future development direction of the broadband access technology undisputed, but from the current technology development, cost and application needs of the actual situation, its distance is widely used in Telecom Access Network this one ultimate goal will have a longer development process.

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