Pulse distortion caused by waveguide inhomogeneity in nonlinear optical wavelength converters
Year: 2023
Authors: Paygan D., Izadi MA., Mousavi SF., Nouroozi R.
Autors Affiliation: Inst Adv Studies Basic Sci IASBS, 444 Prof Yousef Sobouti Blvd, Zanjan 4513766731, Iran; Univ Trieste, Dept Phys, I-34127 Trieste, Italy; CNR INO, Natl Inst Opt, Area Sci Pk, I-34149 Basovizza, TS, Italy.
Abstract: 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 ’((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.
Journal/Review: SCIENTIFIC REPORTS
Volume: 13 (1) Pages from: 1534-1 to: 1534-12
KeyWords: Generation; ConversionDOI: 10.1038/s41598-023-28799-3Connecting to view paper tab on IsiWeb: Click here