Design of ultra-compact wavelength splitter based on lithium niobate nanowire optical waveguides

Abstract

A wavelength splitter with ultra-compact and simple structure is proposed and analyzed by using both plane wave expansion (PWE) method and finite difference time domain (FDTD) method. The device is based on directional coupling between two parallel lithium niobate (LiNbO₃, LN) nanowire optical waveguides. The wavelength splitter with a coupling region length of 5 m can separate 1.31μm and 1.55μm wavelengths for corresponding outputs with transmittance higher than 97%.

Keywords

Optical Waveguide / Lithium Niobate / Finite Difference Time Domain / Plane Wave Expansion / Coupling Length

References

[1] KoshibaM.. J. Lightwave Technol., 2001, 19: 1970

[2] BoscoloS., MidrioM., SomedaC. G.. IEEE J. Quantum Electron., 2002, 38: 47

[3] SmajicJ., HafnerC., ErniD.. Opt. Express, 2003, 11: 566

[4] ChienF. S. S., HsuY. J., HsiehW. F., ChengS. C.. Opt. Express, 2003, 12: 1119

[5] TekesteM. Y., Yarrison-RiceJ. M.. Opt. Express, 2006, 14: 7931

[6] WanwenH., YaoZ., BaojunL.. Opt. Express, 2008, 16: 1600

[7] ZhuG.-X., YuT.-B., ChenS.-W., LiaoQ.-H., LiuN.-H., HuangY.-Z.. Acta Photonica Sinica, 2010, 39: 3450

[8] HuangJ., ChenZ., ZhangZ., ZhuC., HeH., YeZ., QuG., TongL.. Applied Physics Letters, 2011, 98: 093102

[9] BernalM. P., RousseyM., BaidaF., BenchabaneS., KhelifA., LaudeV.. Photonic and Phononic Band Gap Properties of Lithium Niobate, Ferroelectric Crystals for Photonic Applications, Springer Series in Materials Science, 2009, 91: 307

[10] ChenF.. Journal of Applied Physics, 2009, 106: 081101

[11] SulserF., PoberajG., KoechlinM., GünterP.. Opt. Express, 2009, 17: 20291

[12] HuH., RickenR., SohlerW.. Opt. Express, 2009, 17: 24261

[13] LuanP. G., ChangK. D.. Opt. Express, 2007, 15: 4536