单项选择题
Click the Exhibit button. Which type of multiplexer is shown in the exhibit？（）
A. Thin Film filter B. Fiber Bragg Grating C. Arrayed Wave Guide D. Erbium fiber amplifier
多项选择题 Whatarethreefactorsthatlimitthemaximumdistanceofanamplifiedopticalsignalwithoutregeneration？（）
单项选择题 Ifthedispersionofagivenfiberis17ps/nm*kmat1550nmandzeroat1310nm，thenwhatistheaccumulateddispersionofanITUwavelengthafterittravels200km？（）
单项选择题 HowisaThinFilmfilterfabricated？（）
