Low loss WDM add drop node

在一个光纤网络中，在一个主传输光纤(1)上，在连接在此传输光纤的路径中的两个节点(A，B)之间发送双向WDM业务。在两个不同的波长信道(No.1，2)上传送一对节点之间的双向业务，每个波长信道用于一个方向。利用两-信道插入/分出滤波器(5#-[e1-2]，5#-[w1-2])(例如，频带插入/分出滤波器)在每个节点中从环型光纤(1)中的业务中分出或插入这两个波长信道。通过这种方式，连接在此传输光纤的路径中的插入/分出滤波器的数量可以被保持为尽可能小。 In an optical fiber network bidirectional WDM traffic is sent on one optical main transmission fiber (1) between two nodes (A, B) connected in the path of the transmission fiber. The bidirectional traffic between a pair of nodes is carried on two different wavelength channels (Nos. 1, 2), one for each direction. The two wavelength channels are added to/dropped from the traffic in the ring fiber (1) in each node using a two-channel add/drop filter (5e1-2, 5w1-2), e.g. a band add/drop filter. In this way the number of add/drop filters connected in the path of the transmission fiber can be kept as small as possible.