Lithium-Niobate Mach-Zehnder Interferometer With Enhanced Index Contrast by SiO2 Film

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Detail(s)

Original languageEnglish
Article number2415038
Pages (from-to)1224 - 1227
Journal / PublicationIEEE Photonics Technology Letters
Volume27
Issue number11
Publication statusPublished - 1 Jun 2015

Abstract

An electro-optic tunable lithium-niobate (LN) waveguide Mach-Zehnder interferometer (MZI) is designed and fabricated with the annealed proton-exchange process. The MZI consists of a straight waveguide arm and a bent waveguide arm with a SiO2 film deposited on the two sides. The residual stress generated by the SiO2 film can enhance the index contrast of the bent waveguide arm and thus reduce the bending loss of the MZI. A comparison of several experimental devices fabricated on the same chip size of 50 mm x 7 mm confirms significant reduction of the insertion loss by incorporating the SiO2 film. For our best sample, which functions as a tunable comb filter with a channel spacing of 0.75 nm in the C-band, the insertion losses of the two output ports are 13.5 and 6 dB, respectively, and the corresponding maximum extinction ratios are similar to 23 and similar to 1.5 dB. The device has an electrical wavelength-tuning sensitivity of similar to 0.2 nm/V and a temperature sensitivity of similar to 0.1 nm/degrees C. Our design approach can significantly improve the quality of LN devices that require waveguide bends.

Research Area(s)

  • Mach-Zehnder interferometer, tunable optical filter, electro-optic effect, lithium niobate, elasto-optic effect, optical waveguide

Citation Format(s)

Lithium-Niobate Mach-Zehnder Interferometer With Enhanced Index Contrast by SiO2 Film. / Chen, Kai Xin; Li, Xue Peng; Zheng, Yan Lin; Chiang, Kin Seng.

In: IEEE Photonics Technology Letters, Vol. 27, No. 11, 2415038, 01.06.2015, p. 1224 - 1227.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal