Ae. Willner et Sm. Hwang, OPTICALLY-AMPLIFIED WDM RING NETWORK INCORPORATING CHANNEL-DROPPING FILTERS, IEEE photonics technology letters, 6(6), 1994, pp. 760-763
We analyze the critical parameters in an optically-amplified WDM ring
network. We find that a ring can accomodate 27 nodes when incorporatin
g an EDFA and a channel-dropping filter in each node, a significant ad
vance over nonamplified rings. We compare several node configurations,
and find that the sequence of an EDFA followed by an optical tap and
a channel dropping filter provides the highest performance for a wide
range in system variables including input signal power, inter-node lin
k loss and its variability, power-tapping ratio, and small-signal gain
. Limited network modularity can be achieved.