Two applications of B DFRA are studied. The first case is a receiver terminal with a receiver, an EDFA preamplifier and a B DFRA.

• 分别讨论了B DFRA的两种可能用途 :1)作为第一级预放器与掺铒光纤放大器 (EDFA)及光接收机一同构成接收终端。