Optical Fiber Coupler Fujikura Optical Fiber Coupler is qualified with Telcordia GR-1221-CORE and GR-1209-CORE. Contact us here for inquiries. contact us Features Application Features High reliability Low loss Low polarization dependent loss Branching ratio : 2 - 50% (Customizable on demand) Application Submarine repeater Fiber laser Contact us here for inquiries. contact us Product introduction (PDF183KB)