1550nm 1X4 Polarization Maintaining Fiber Coupler Module

Idealphotonics’ low-profile couplers have inherent performance advantages because the waveguide core is not deformed or tapered. These devices have low losses and back reflections. Also, the short interaction length (1-2 mm) allows for small device packaging. The interface is essentially vanishing in optical contact between identical silica surfaces. There is no intermediate material that changes its refractive index or thickness with age or environmental influences. The optical performance of the couplers is as if the fibers were molten and is very stable under temperature variations. The fibers are side-polished in a glass substrate block to remove the cladding material on one side of the core without distorting the core region. For PM fibers, only one stress member remains. The two polished fibers are brought into optical contact with their polarization axes aligned and coupling between the cores is achieved by the evanescent wave interaction. Precise loading of the substrate block ensures that the fibers remain in low-stress contact over a wide temperature range.