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International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD)

All-optical decision gate circuits using cascaded periodically poled lithium niobate devices

Yutaka Fukuchi, Daiki Minamide, Masaru Yamamoto

Published Sep 1, 2015• 0 citations
Publisher

Abstract

We propose a cascaded periodically poled lithium niobate device. In the device, two lithium niobate crystals with different quasi-phase matching wavelengths are cascaded. We numerically show that the cascaded periodically poled lithium niobate device has an all-optical level discriminating characteristic, thus enabling a compact and stable ultra-fast 3R circuit.

DOI
10.1109/nusod.2015.7292833

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We propose a cascaded periodically poled lithium niobate device. In the device, two lithium niobate crystals with different quasi-phase matching wavelengths are cascaded. We numerically show that the cascaded periodically poled lithium niobate device has an all-optical level discriminating characteristic, thus enabling a compact and stable ultra-fast 3R circuit.
We propose AND, NOR, and XNOR logic gates realized simultaneously for 40-Gb/s networks, in which the realization of NOR and XNOR logic gates using only MgO-doped periodically poled lithium niobate (MgO: PPLN) is reported.In our configuration, we exploit broadband quasi-phase matching (QPM) cascaded second harmonic and difference-frequency generation (cSHG/DFG), cascaded sum-frequency and differencefrequency generation (cSFG/DFG) in one MgO:PPLN, and the narrow band QPM sum-frequency generation (SFG) in another MgO:PPLN.The performance, including the quality-factor (Q-factor) and extinction ratio (ER), of the proposed multifunctional logic device is also simulated.
We propose and experimentally demonstrate phase-regenerative wavelength conversion in periodically poled lithium niobate waveguides, using either: a single-stage implementation based on a simultaneous combination of two cascaded second-order nonlinear effects in a single periodically poled lithium niobate waveguide, or a two-stage implementation where two separate devices are used in sequence to give rise to the same nonlinear effects. The phase regeneration properties of the proposed wavelength conversion schemes are also investigated.
We report on wavelength-shifting based on cascaded second-order nonlinearities1 in periodically-poled lithium niobate. Wavelength shifting from a signal s at λs=λp+Δ to a frequency-shifted signal f at λf=λp−Δ is obtained under the action of a pump p at λp: the effect is realized through the generation of the second harmonic (sh) of p and subsequent parametric amplification of s driven by sh. In the latter process f is also generated. Exploiting the advantages of quasi-phase-matching, efficient shifting is achieved at pump intensities about two orders of magnitude lower than in traditional second-order materials such as BBO.2