Single mode optical waveguide
AssigneeIbiden Co., Ltd.
InventorMasanori Nakamura
Life of this patent
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Abstract
A waveguide becomes a single mode waveguide under the condition as described below. If the LiNbO.sub.3 waveguide includes an Na content in a range of 0.1 to 14.3 mol % and an Mg content in a range of 0.8 to 10.8 mol %, and provided that T(.mu.m) represents a thickness of the waveguide, and .lambda. (.mu.m) represents a wavelength of the guided wave, then the relationships in the following equations are preferable, in the case of TM mode, 1.9<(T+0.7)/.lambda.<5.7 (T>0) in the case of TE mode, 0.29<(T+0.04)/.lambda.<1.19 (T>0).
Claims2
A single mode optical waveguide characterized by comprising a crystal of LiNbO.sub.3 thin film waveguide layer including at least an Na content in a range of 0.1 to 14.3 mol % and an Mg content in a range of 0.8 to 10.8 mol %, thereby lattice matching LiNbO.sub.3 thin film waveguide layer and LiTaO.sub.3 single crystal substrate, and following relationship being satisfied;
- in the case of TM mode,
- 1.9<(T+0.7)/.lambda.<5.7 (T>0)
- in the case of TE mode,
- 0.29<(T+0.04)/.lambda.<1.19 (T>0)
- where T(.mu.m) represents a thickness of the waveguide layer, and .lambda. (.mu.m) a wavelength of the guided wave.
Dependencies are inferred from the claim text.