Phase-error correction and birefringence control in planar lightwave circuits using photosensitivity locking

Summary from only given. We apply photosensitivity locking to both stabilize and enhance the photosensitivity responses in planar lightwave circuits (PLCs). Strong photosensitivity was locked in hydrogen-loaded PLCs, and shown to survive thermal annealing at 225C. An index change exceeding 2.5 X 10/sup -3/ and a birefringence of more than 1 X 10/sup -4/ were induced by post laser trimming of a Mach-Zehnder interferometer and an interleaver. The procedure has advantages for phase error correction and birefringence control in PLCs.