Optical path switching node, optical fiber network and test method for the optical fiber network

Abstract

The present disclosure is an optical path switching node including: a four-way optical switch capable of switching to any one of a first connection state in which a first port and a second port are connected internally, and a third port and a fourth port are connected internally, a second connection state in which the first port and the third port are connected internally, and the second port and the fourth port are connected internally, and a third connection state in which the first port and the fourth port are connected internally, and the second port and the third port are connected internally; a first optical coupler that couples test light to an optical path from the first port in an external direction of the four-way optical switch; a second optical coupler that couples test light to an optical path from the second port in an external direction of the four-way optical switch; a third optical coupler that couples test light to an optical path from the third port in an external direction of the four-way optical switch; and a fourth optical coupler that couples test light to an optical path from the fourth port in an external direction of the four-way optical switch.

Dependencies are inferred from the claim text.