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

스트레인광학효과를 이용한 2×2Ti:LiNbO3 삽입/분기 집적광학 멀티플렉서

  • 정홍식 (홍익대학교, 과학기술대학, 전자전기공학과) ;
  • 최용욱 (홍익대학교, 과학기술대학, 전자전기공학과)
  • Published : 2006.10.25


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.


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