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Optics Letters

Apodized multiple quasi-phase-matched LiNbO_3 device for low-cross-talk waveband conversion

Isao Tomita, Takeshi Umeki, Osamu Tadanaga, Hongbin Song, Masaki Asobe

Published Mar 4, 2010• 3 citations
Publisher

Abstract

We developed an apodized multiple quasi-phase-matched (QPM) LiNbO(3) device to reduce the cross talk that occurs during waveband conversion. Since we found that the cross talk arises from ripples between multiple QPM peaks in the phase-matching curve, we reduced the amplitude of the ripples by employing the apodized structure. Using this device, we succeeded in demonstrating waveband conversion with low cross talk.

DOI
10.1364/ol.35.000805

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We developed an apodized multiple quasi-phase-matched (QPM) LiNbO(3) device to reduce the cross talk that occurs during waveband conversion. Since we found that the cross talk arises from ripples between multiple QPM peaks in the phase-matching curve, we reduced the amplitude of the ripples by employing the apodized structure. Using this device, we succeeded in demonstrating waveband conversion with low cross talk.
Quasi-phase-matched (QPM) LiNbO₃ devices having a multiperiod-periodically-poled structure, which we call multiperiod-QPM LiNbO₃ devices, are capable of shifting the idler waveband during waveband conversion via cascaded difference-frequency generation (cascaded DFG). However, these multiperiod-QPM devices have a problem that they produce extra ripples between QPM peaks in the phase-matching curve. These ripples cause crosstalk between wavebands arising from sum-frequency generation (SFG) between the signal and idler wavebands and subsequent DFG between the SFG wavelength and the signal waveband. To decrease the size of the ripples and thus that of the crosstalk, an apodized multiperiod-QPM device is developed. In demonstrating waveband conversion for low crosstalk with this device, we measure the dependence of the idler power, the crosstalk power, and their ratio on the signal power. This measurement shows that it agrees well with theoretical prediction and that the obtained feature of crosstalk reduction is kept even for decreased signal power.
Optical parametric amplification (OPA) in the S-band with a compact configuration was demonstrated using a reflective multiple quasi-phase-matched (M-QPM) LiNbO 3 waveguide module. The reflective-module-assembled LiNbO 3 waveguide has two QPM peaks and a built-in mirror that reflects only the second harmonic. These features make it possible to perform second harmonic pump generation and OPA under different phase-matching conditions using a single device. The idler light generated in the module retains the phase information from the signal light and is used to evaluate signal quality.
A configuration for wavelength conversion and optical amplification by parametric interaction using a nonlinear optical device is proposed. It enables pump generation through second harmonic generation (SHG), difference frequency generation (DFG), and optical parametric amplification (OPA) using a multiple-quasi-phase-matched (M-QPM) LiNbO3 waveguide in a bidirectional manner. Wavelength conversion for the 1.4–1.6 µm band is experimentally demonstrated. In addition, it is demonstrated that the parametric gain band can be changed using various detunings between the pump and QPM wavelengths used for the DFG/OPA process. The proposed method would be useful for enabling high-capacity optical transmission outside the 1550-nm band.