Patent ID: 6763685
Filing Date: 2004-07-20
Classification: G02B

Abstract:
Method of fabrication of multiplexing and demultiplexing single-mode fiber optic couplers which comprises:(a) aligning two single-mode fibers, which have been stripped of their protective plastic jackets and cleaned, so that they are held in contact with each other; (b) fusing said fibers in a fusing zone, using a suitable heat source to achieve a predetermined fusion profile; and (c) in a separate step, elongating the fused fibers by controllably pulling them longitudinally while heating them with a suitable heat source so as to create a coupling zone with an adiabatic profile, and stopping the elongation process when a match point between wavelength period and polarization phase is achieved so as to obtain simultaneously a predetermined wavelength spacing and a required polarization phase match, thereby producing the desired multiplexing or demultiplexing coupler.