Electro-optic long-period gratings on lithium niobate waveguides

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

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Detail(s)

Original languageEnglish
Pages (from-to)544-549
Journal / PublicationDianzi Keji Daxue Xuebao/Journal of the University of Electronic Science and Technology of China
Volume38
Issue number5
Publication statusPublished - Sep 2009

Abstract

This paper reviews the development of electro-optic (EO) long-period waveguide gratings (LPWG) on lithium niobate (LiNbO3). We first discuss the main difficulty of fabricating LPWGs on LiNbO3 and explain the principle and the method of forming a special LiNbO3 waveguide structure to overcome this difficulty. We then highlight the main findings from the study of EO LPWGs on LiNbO3, including the effects of using different cladding modes and waveguide parameters on the grating performance and the temperature sensitivity of the resonance wavelength. EO LPWG on LiNbO3 allows the grating strength and the resonance wavelength to be controlled effectively by the driving voltage and the temperature, respectively, and has the potential to be further developed into new dynamic optical filters and intensity modulators for high-speed applications. Our best sample demonstrated so far shows a grating strength of 25 dB at a driving voltage of 49 V and a thermally tunable resonance wavelength with a sensitivity of -1.0 nm/°C.

Research Area(s)

  • Electro-optic effect, LiNbO3, Long-period grating, Optical filter, Optical waveguide, Optical waveguide grating

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