Pulse distortion caused by waveguide inhomogeneity in nonlinear optical wavelength converters

Low-noise integrated all-optical wavelength converters that can be operated in short pulse regime are essential tools to overcome contention resolution in a modern communication network, based on wavelength division multiplexing. Any imperfect functionality in such devices causes non-ideal optical p...

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Bibliographic Details
Published in:Scientific reports 2023-01, Vol.13 (1), p.1534-1534, Article 1534
Main Authors: Paygan, Danial, Izadi, Mohammad Amin, Mousavi, S. Faezeh, Nouroozi, Rahman
Format: Article
Language:English
Subjects:
639/766/1130
639/766/1130/2799
639/766/25
Communication
Communications networks
Electric fields
Humanities and Social Sciences
Investigations
Lithium
multidisciplinary
Optics
Propagation
Science
Science (multidisciplinary)
Wave division multiplexing
Wavelength
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Summary:Low-noise integrated all-optical wavelength converters that can be operated in short pulse regime are essential tools to overcome contention resolution in a modern communication network, based on wavelength division multiplexing. Any imperfect functionality in such devices causes non-ideal optical power transfer to the converted data pulses. All imperfections during the preparation and operation of the wavelength converters can be addressed to the waveguide inhomogeneity which distorts data pulses to be converted. This paper reports different waveguide inhomogeneity effects on the pulse distortion while using periodically poled lithium niobate waveguide as wavelength converters. Three types of χ ( 2 ) -based nonlinear optical processes, including second harmonic generation, difference frequency generation, and cascaded second harmonic generation/difference frequency generation are numerically studied to show that any constant, linear, and quadratic waveguide inhomogeneity causes short pulse (down to 1 ns) distortion in such wavelength converters. In addition, it is shown that the reconstruction of sech 2 -shaped generated pulses is possible, when suitable upside-down quadratic variations of obtained inhomogeneity are deliberately induced in the waveguide. Notably, for pulsed second harmonic generation, the generated pulse can be compressed using an upside-down quadratic phase mismatch.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-023-28799-3