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Wavelength selective single and dual-channel dropping in a periodically poled Ti:LiNbO3 waveguide

Yeung Lak Lee, Changsoo Jung, Young-Chul Noh, Il Woo Choi, Do-Kyeong Ko, Jongmin Lee, Han-Young Lee, and Hubertus Suche

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Abstract

All-optical wavelength selective single and dual channel dropping by sum frequency generation has been demonstrated in a periodically poled Ti:LiNbO3 waveguide, which has two second harmonic phase-matching peaks. Less than -17 dB of channel dropping extinction ratio was observed with coupled pump power of 325 mW.

©2004 Optical Society of America

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Figures (5)
Fig. 1.
Fig. 1. Phase-matching characteristics for channel dropping by SFG. Vertical arrow lines indicate energy conservations.

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Fig. 2.
Fig. 2. The solid line is SHG curve at the operation temperature of 158 °C. The maximum conversion efficiency is measured to be 300 %/W.

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Fig. 3.
Fig. 3. Schematic diagram of the experimental setup; ECL : extended cavity semiconductor laser, DFB : distributed feedback laser, HP-EDFA : high power erbium-doped fiber amplifer, OSA : optical spectrum analyzer, (PC1, PC2, PC3) : polarization controller.

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Fig. 4.
Fig. 4. Optical spectrum at the output of the Ti:PPLN waveguide at three different pump wavelength and no pump. The insets show the spectra of generated SF.

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Fig. 5.
Fig. 5. Signal depletion by SFG versus coupled pump power.

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Equations (5)

Equations on this page are rendered with MathJax. Learn more.

d A 1 dz = − i κ 1 A 2 A 3 * e − i Δ k 1 z − i κ 2 A 4 A 5 * e − i Δ k 2 z ,
d A 2 * dz = i κ 1 A 1 A 3 * e i Δ k 1 z ,
d A 3 dz = − i κ 1 A 1 A 2 e i Δ k 1 z ,
d A 4 * dz = i κ 2 A 1 A 5 * e i Δ k 2 z ,
d A 5 dz = − i κ 2 A 1 A 4 e i Δ k 2 z ,
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