COUPLING DEVICE FOR COUPLING OF OPTICAL CONNECTION PART

摘要

PROBLEM TO BE SOLVED: To actualize a distribution network although only unidirectional amplification is applied and to provide the coupling device with self-restorable property based upon several network nodes which have coupling devices and are included in a single fiber connection part. SOLUTION: In the ring-shaped optical distribution network equipped with a center node and N network nodes, a distributed signal DS is sent by the center node in two transmission directions (F and B). To carry out a drop continue function (DC function), each network node consists of a coupling device 21 equipped with an optical switch 28 with 2×2 terminals and a tapping device 33. The switch and tapping device are mutually coupled by a method which switches the DC function to only one of the two transmission direction. The switch 28 is switched when the distributed signal is not received by the network node any more. This network has self-restorable property against a single fault of the network.