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| | Since the year 1990 till to the early of 21 century ,the telecommunication demand for bandwidth has been increasing exponentially. Transmission technology is moving toward higher bit rates per wavelength and to dense wavelength division multiplexing (DWDM).The specifications to determine polarization mode dispersion (PMD) coefficient with statistical methods are under consideration. The demand on high count fiber cable is increasing thereby increasing the applications for ribbon cable. The systems with alte... | | 自1990年到21世纪初,通信对带宽的需求呈指数增长;传输技术正向高比特率和密集波分复用(DMDM)发展;正在研究以统计法确定偏振模色散(PMD)的规范;对于多芯数光缆的需求增加使得光纤带光缆前景广阔;用具有正色散的真波光纤与负色散的真波光纤相间连接的系统可不需色散补偿,最适于陆地长途干线应用。增加光纤的有效面积可克服非线性效应。但是,现有的大有效面积光纤(LEAF)存在着零色散斜率高、对弯曲敏感等问题,对于陆上应用并不理想,最适于海缆应用。性能全面优化的大有效面积光纤正在发展中。 | | 文摘来源 | |   |
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