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We demonstrate the coupling of a 2x2 waveguide array produced by a femtosecond laser in fused silica. The coupling constants of the waveguide array are obtained by measuring the ratio of output power of each waveguide by the coupled-mode theory. The variation of the coupled power between four waveguides as a function of the propagation distance is investigated experimentally and theoretically.

Beam coupling in 2×2waveguide arrays in fused silica fabricated by femtosecond laser pulses