Coherent analyzer for multi-port optical networks

An optical interface device comprising:

• a stimulus input port for receiving a light signal;
• a test signal output port;
• a plurality of device test ports, each device test port coupling said interface to a port of a device under test;
• a reference signal generator for generating a reference signal and a stimulus signal from said light signal;
• a first optical switch for routing said stimulus signal to one of said device test ports, said first optical switch having one output port corresponding to each of said device test ports;
• a second optical switch having a plurality of input ports, each input port being connected to a corresponding one of said device test ports, and a switch output port coupled to said test signal output port;
• and
• a plurality of optical routers, one corresponding to each of said device test ports, each optical router connecting an output of said first optical switch to a corresponding one of said device test ports and connecting that device test port to a corresponding one of said second optical switch input ports.