有线电视1550系统中掺铒光纤放大器的串联

Series of EDFA in CATV 1550nm Optical System

有线电视系统通常采用1310nm或者1550nm的发射光波长。随着1550nm外调制光发射机成本的降低,1550nm光系统的优势越来越明显:传输距离长、衰减小、可以进行中继放大传输,减少机房内的设备数量从而降低用电量等。在1550nm光传输系统里,用来中继放大的光放大器得到了广泛的应用,然而随着串联级别逐渐增多,会导致信号质量的下降。本文根据一次实际故障,通过光放大器背靠背实验进行测试,分析光放大器的使用环境,对于光放大器放置位置的设计规划提供参考。

Cable TV system usually adopts the emission wavelength of 1310 nm and 1550 nm.With lower cost of 1550 nm externally modulated optical transmitter,1550 nm optical system＇s advantage is more and more obvious,such as long transmission distance,low attenuation,relay amplifying transmission and so on.In the 1550 nm optical system,the optical amplifier used for relay amplification is widely used.With the gradual increase in the series level,however,it will lead to a decline in the quality of the signal.According to a actual fault,the paper analyses the using environment analysis of optical amplifier to provide reference.