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This letter reports the demonstration of a novel method to passively tune the splitting ratio of a Ti-indiffused lithium niobate (LiNbO3) 3-dB directional coupler by the addition of a silicon-rich… Click to show full abstract
This letter reports the demonstration of a novel method to passively tune the splitting ratio of a Ti-indiffused lithium niobate (LiNbO3) 3-dB directional coupler by the addition of a silicon-rich nitride cladding material. Plasma-enhanced chemical vapor deposition of such cladding layer onto a coupler alters the effective index of the odd and even modes in the coupled waveguide. By varying the thickness of the thin-film cladding layer, we are able to precisely control the coupling ratio and compensate for variations arising from fabrication tolerances that can significantly impact coupling.
Journal Title: IEEE Photonics Technology Letters
Year Published: 2017
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