Abstract
A new fabrication method of waveguide integrated elements immersed in shallow buried single-mode planar waveguides fabricated in glass substrates is proposed in order both to avoid scattering losses, by minimizing the interaction of the propagating field with surface irregularities, and to improve fibre–waveguide coupling performance. Likewise, by a proper choice of the waveguide characteristics, which are related to the fabrication parameters, both a high-single-mode-transmission regime and a high optical power in the waveguide element are obtained.
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