Patent ID: 6556738
Filing Date: 2003-04-29
Classification: G02B,H04B,H04Q

Abstract:
A fiber optic circuit comprising:a first optical signal pathway; a second optical signal pathway; means for selecting between a normal through state and a loop back state, wherein in the normal through state, the first and second pathways are not connected, and wherein in the loopback state the first and second pathways are connected to define two loopback pathways; means for providing access to the first optical signal pathway to optically link third and fourth optical signal pathways to the first optical signal pathway; and means for providing access to the second optical signal pathway to optically link fifth and sixth optical signal pathways to the second optical signal pathway; wherein in the loopback state, the means for providing access to the first optical signal pathway provides access to one of the loopback pathways, and the means for providing access to the second optical signal pathway provides access to the other loopback pathway.