| 摘要 |
PURPOSE:To correspond to miniaturization by utilizing integrating technics even when the number of terminals increases, and to make a response for a control signal highly speedy by branching a light signal in power, and selecting a signal optionally out of them. CONSTITUTION:A light signal, which is impressed to an input terminal IL1 by an input light fiber line, is branched in 1/m power respectively at a branch circuit DC1, and guided through branch circuits DL1-DLm to selecting circuits SC1-SCm. The circuit SC is provided with the mXn number of switches S11-Sn1 switched and controlled by the control signal, between an input and an output of the mXn number. In the switch S, S11 only corresponding to an input line out of the circuit SC1 corresponding to a free output fiber line OL1 to be outputted is controlled to the closed circuit by the control signal. Thus, an input signal is outputted through a multiplexing circuit CC1 corresponding to the selecting circuit to the selected output fiber line OL1. |
