| 摘要 |
An optical coupling device is provided. The device is based on a substrate in which two channel waveguides are provided. A coupling region is defined in the substrate through which both waveguides lie adjacent to each other. A periodic refractive index change is permanently provided in the coupling region. The periodic refractive index change permanently has a period LAMBD and enables a coupling between the waveguides of light having a coupling wavelength lambd=LAMBD(neff1-neff2), where neff1 and neff2 are average refractive index values of the respective waveguides along the coupling region, neff1 being different from neff2. An electric field may be applied to the coupling region to allow a tuning of the coupling wavelength.
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