Patent ID: 6240222
Filing Date: 2001-05-29
Classification: G02B,H04J,H04Q

Abstract:
An optical apparatus comprised of:a combination multiplexer/demultiplexer comprised of:a first bidirectional main input/output port;a set of further bidirectional input/output ports;a main coupling device comprised of a first, second, and third port wherein:the second port of the coupling device is connected to the first bidirectional main input/output port of the combination multiplexer/demultiplexer;and further comprised of a transition device for taking a first output from a first further bidirectional input/output port of the combination multiplexer/demultiplexer and supplying the first output to a second further bidirectional input/output port of the combination multiplexer/demultiplexer, said transition device connected to both the first and second further bidirectional input/output ports of the combination multiplexer/demultiplexer.