| Abstract
| - Abstract. It is shown that by taking advantage of the maximum in the spectral dependence of the coupling coefficient, very broad-band symmetric and asymmetric single-mode planar couplers can be designed. The symmetric coupler allows at least 95.6% coupling between the two cores over the wavelength range 1.3-1.58 μm, while the asymmetric coupler can act as a 3 dB splitter with only ±1.6% variation in the splitting ratio over the wavelength range 1.3-1.67 μm. In both cases, the design includes the curved input-output arms, and the estimated bend loss is approximately 0.1 dB.
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