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随着掺铒光纤放大器的出现,人们对采用光放大器系统的1.55μm波长超长距离无中继、光用户多重分配网络的实用化正在进行积极的研究.出于对高速传输的考虑,这些线路希望采用1.55μm波长色散为零的色散移位光纤.而过去已大范围敷设的1.3μm零色散光纤在1.55μm下存在约17ps/nm·km的色散而不适合于1.55μm下的高速传输.为使业已敷设的1.3μm零色散单模光纤网络实现1.55μmn的高速传输,近年来人们对波长色散的补偿技术进行了集中的研究.迄今为止的色散补偿方法,虽然也在试验从发送端采用预线性调频等方法,但由于用光纤的方法在构成上比较简单而一般用得较多.
With the advent of erbium-doped fiber amplifiers, there is ongoing research into the practical application of an optical amplifier system with a 1.55-μm wavelength over a long distance without relaying and an optical subscriber multiple distribution network. For high-speed transmission considerations, these lines It is desirable to use a 1.55 μm dispersion shifted fiber with a wavelength dispersion of zero, whereas a 1.3 μm zero dispersion fiber, which has been widely deployed in the past, has a dispersion of about 17 ps / nm · km at 1.55 μm and is not suitable for high speed transmission at 1.55 μm. In order to realize the 1.55μmn high-speed transmission of the 1.3μm zero-dispersion single-mode optical fiber network already laid, people have done a concentrated research on the compensation technology of the wavelength dispersion in recent years. Although the dispersion compensation method hitherto has been experimentally adopted from the transmitting end Pre-chirp and other methods, but due to the optical fiber method is relatively simple in structure and generally used more.