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We describe a technique for reducing the wavelengthdependent phase-difference deviation between in-phase and quadrature components in an 90◦ optical hybrid consisting of four 3-dB couplers and a phase shifter. We fabricated the 90◦ hybrid with our proposed technique, which uses silica-based planar lightwave circuit technology. The fabricated 90◦ hybrid exhibits a low phase-difference deviation from 90◦ of less than 0.7◦ over the Cand L-bands, and will be useful in a digital coherent receiver for transmission systems operating at 100 Gbit/s or more.

Reduction of phase-difference deviation in 90.DEG. optical hybrid over wide wavelength range