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http://dx.doi.org/10.3807/KJOP.2006.17.5.430

2×2Ti:LiNbO3 Integrated Optical Add/Drop Multiplexers utilizing Strain-Optic Effect  

Jung, Hong-Sik (300 Shinan Jochiwon Yeongi Chungnam)
Choi, Yong-Wook (300 Shinan Jochiwon Yeongi Chungnam)
Publication Information
Korean Journal of Optics and Photonics / v.17, no.5, 2006 , pp. 430-436 More about this Journal
Abstract
Polarization-independent $Ti:LiNbO_3\;2{\times}2$ optical add/drop multiplexer for the 1550nm wavelength region is fabricated. The device consists of two input waveguides, two polarization beam splitters. two polarization conversion/electrooptic tuning waveguide sections, and two output waveguides. The single mode channel waveguides for both TE and TM polarizations are fabricated on a x-cut $Ti:LiNbO_3$substrate by Ti diffusion. Spectral section is based on phase-matched polarization conversion due to shear strain induced by a thick $SiO_2$ grating overlay film. An applied voltage tunes the device by changing the waveguide birefringence, hence the optical wavelength at which most efficient polarization conversion occurs. Tuning rate of 0.094nm/V with a maximum range of 17nm has been obtained. The nearest side-lobe is about 8.2dB. The FWHM is 3.72nm.
Keywords
Integrated optical add/drop multiplexer; Strain-optic effect; Quasi phase matching; $Ti:LiNbO_3$ Channel waveguide; Polarization mode converter; Electro-optic effect; Polarization mode splitter;
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