• Proceedings of the Optical Society of Korea Conference
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• 2003.07a
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• pp.234-235
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• 2003

오늘날 급속한 인터넷 사용량 증가로 인해 광통신 시스템의 고속화와 대용량화의 필요성은 점점 커지고 있다. 이에 광신호 처리에 있어서 초고속 광 스위칭과 파장분할 다중화 방식이 활발히 연구되고있으며, 특히 주기적으로 분극 반전된 리튬나오베이트(LiNbO$_3$：PPLN)를 이용한 스위칭 소자나 파장 변환기에 대한 연구가 많이 진행되고 있다. PPLN 제작을 위하여 최근에는 고압의 전계를 리튬나오베이트(LiNbO$_3$)에 인가하는 방법이 우수한 특성으로 인하여 주로 사용되고 있다. (중략)

• Korean Journal of Optics and Photonics
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• v.19 no.6
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• pp.408-415
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• 2008

The characteristics of a ferroelectric-domain inverted grating fabricated by applying a high-voltage pulse at room temperature in Ti-diffused channel waveguides in z-cut $LiNbO_3$ (Ti:PPLN) were examined for channel waveguide quasi phase-matched secondharmonic generation devices. The fabrication conditions of uniform periodic domain-inversion were examined. Ti:PPLN with period ${\Lambda}=16.6{\mu}m$ for SHG were fabricated and the performances were measured. A normalized SHG efficiency as high as 473 (%/W) was obtained with 49 mm interaction length.

• Korean Journal of Optics and Photonics
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• v.16 no.4
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• pp.366-375
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• 2005

A fabrication process of periodic electric field assisted poling of Ti-diffused channel waveguides in LiNbO3 (Ti:PPLN) has been developed and improved using a periodic 180o phase inversion along the z-axis. The zig for poling inversion and the Labview program of charge control have been devised. Pulse high voltage and duty cycle were adjusted based on the estimated charge required for poling inversion. Monitoring the change of leakage current under applied voltage less than the coercive voltage also minimized a breakdown.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.9 no.4
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• pp.161-168
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• 2009

We demonstrated $\check{S}$olc-type wavelength filters in periodically poled Ti-diffused lithium-niobate channel optical waveguide (Ti:PPLN). A $\check{S}$olc-type transmission spectrum based on the polarization-mode conversion was observed experimentally in PPLN with period 16.6${\mu}m$. A reasonable explanation of such a phenomenon was presented. A polarization-mode converted transmission peak was observed at wavelength 1272.49nm. The FWHM and sidelobe of spectrum are about 0.23nm and 7 dB, respectively.