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Channel-selective wavelength conversion and tuning in periodically poled Ti:LiNbO3 waveguides

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Abstract

All-optical wavelength-selective single- and dual-channel wavelength conversion and tuning has been demonstrated in a periodically poled Ti:LiNbO3 waveguide that has two second-harmonic phase-matching peaks by cascaded sum and difference frequency generation (cSFG/DFG). The wavelength conversion efficiency was measured to be -7 dB with coupled pump power of 233 mW.

©2004 Optical Society of America

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Figures (6)

Fig. 1.
Fig. 1. SHG curve at room temperature. The conversion efficiency of the two high peaks are 319%/W and 291%/W, respectively.
Fig. 2.
Fig. 2. Experimental setup to demonstrate all-optical channel-selective wavelength conversion by cSFG/DFG; ECL: extended cavity semiconductor laser, DFB: distributed feedback laser, HP-EDFA: high power erbium-doped fiber amplifer, OSA: optical spectrum analyzer, (PC1, PC2, PC3, PC4): polarization controller.
Fig. 3.
Fig. 3. Phase-matching characteristics for channel dropping by SFG. Vertical arrow lines indicate energy conservations.
Fig. 4.
Fig. 4. Optical spectra of wavelength conversion on the basis of the cSFG/DFG process (in the case of signal 1 conversion). In our case, the spacing between signal 1 and signal 2 is greater than 0.3 nm where the cross talk between channels becomes significant.
Fig. 5.
Fig. 5. Optical spectra of wavelength conversion based on cSFG/DFG process (in the case of signal 2 conversion).
Fig. 6.
Fig. 6. Optical spectra of wavelength conversion based on cSFG/DFG process (in the case of the conversion of both signals).
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