OPTICAL-FIBER CABLES FOR SYNCHRONOUS REMOTING OF NUMEROUS TRANSMITTERS RECEIVERS/

The relative fiber-to-fiber microwave phase changes induced in optical fiber cables by interfiber thermal and strain (bending-induced) gradi ents are reported. It is found that these changes are effectively mini mized in cables where the fibers spin around the center member at a fa st rate. Commercial ''loose-tube'' cables are found to preserve the fi ber-to-fiber phases within 1 degrees at modulation frequencies as high as 18 GHz. These cables appear well suited for fiber-optic remoting o f numerous phase-matched transmitters and receivers.