问题 单项选择题

关于拉曼放大器DRA和掺铒光纤放大器EDFA的说法不正确的是()。

A.DRA比EDFA噪声大

B.DRA比EDFA噪声小

C.DRA是40Gbps波分系统的关键器件之一

D.将DRA与EDFA配合使用,能够在获得高增益的同时减少噪声

答案

参考答案:A

综合

对比“世界主要山脉分布图”,完成下列问题。

 

(1)世界上高大山脉的分布地带与火山地震带的分布是否一致?为什么?

                                                                                                                                                                 

                                                                                                                                                                 

(2)我国哪些地区多火山地震?为什么?

                                                                                                                                                                   

                                                                                                                                                                   

(3)尝试解释我国东部地区山脉的延伸方向为什么与海岸线相平行?

                                                                                                                                                                   

                                                                                                                                                                   

判断题