WDM transmission technologies for dispersion-shifted fibers

被引:0
作者
Jinno, M [1 ]
Fukui, M [1 ]
Sakamoto, T [1 ]
Aisawa, S [1 ]
Kani, J [1 ]
Oguchi, K [1 ]
机构
[1] Nippon Telegraph & Tel Corp, Opt Network Syst Labs, Yokosuka, Kanagawa 2390847, Japan
关键词
wavelength division multiplexing; dispersion-shifted fiber; four-wave mixing;
D O I
暂无
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Dense WDM techniques that exploit the enormous bandwidth of dispersion-shifted fibers (DSFs) while avoiding the impairments due to nonlinear effects are described. First, the nature of four-wave mixing (FWM), the dominant impairment factor in WDM transmission systems, is investigated using DSF installed in the field and laboratory experiments. This provides useful information for the practical design of WDM networks based on DSF. Second, practical techniques to reduce FWM impairment, unequal channel allocation and off-lambda-zero channel allocation (equal channel allocation in the novel 1580 nm band) along with gain-shifted erbium-doped fiber amplifiers for the 1570 to 1600 nm band, is described. Comparisons between off-lambda-zero and unequal channel allocation are provided in terms of the maximum transmission distance for various numbers of channels. Two schemes to immunize WDM systems against group velocity dispersion, span-by-span dispersion compensation and optical duobinary format, are presented. The combination of unequal channel allocation with off-lambda-zero channel allocation as well as the combination of two bands: the conventional 1550 nm band and the novel 1580 nm band are proven to be very useful in expanding the usable bandwidth of DSFs.
引用
收藏
页码:1264 / 1275
页数:12
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