| 摘要 |
An optical interface device for applying a light signal to a port of device under test and analyzing the signals leaving each of the ports on the device. The device to be tested has at least two such ports. An interface device according to the present invention includes a plurality of optical couplers having first, second, third, and forth ports. Each of the optical couplers transfers a first fraction of a first optical signal received at the first port to the second port and a second fraction of that optical signal to the third port. In addition, each of the couplers transfers a fixed fraction of a second optical signal entering the second port to the fourth port. There is one such optical coupler for each of the ports of the device to be tested at any given time, the second port of that optical coupler being coupled to that port during testing. The interface device also includes a first multiplexer coupled to the first ports of the optical couplers for receiving a stimulus light signal and coupling the stimulus light signal to one of the optical couplers. One embodiment of the invention includes a second multiplexer for connecting the third ports of the optical couplers to a test device for analyzing the stimulus signal input to the first ports of the optical couplers. In a third embodiment of the invention, a third multiplexer is used to connect the fourth ports of the optical couplers to a test device for analyzing light signals received on the second ports of the optical couplers.
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