Author Affiliations
Abstract
1 Xi’an Research Institute of High Technology, Xi’an 710025, China
2 School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China
3 State Key Laboratory of Pulsed Power Laser Technology, Hefei 230037, China
We proposed an aperiodic laser beam distribution, in which the laser beams are placed along a Fermat spiral, to suppress the sidelobe power in the coherent beam combining. Owing to the changed distances between two consecutive beams, the conditions of the sidelobe suppression are naturally satisfied. The Fermat spiral array was demonstrated to achieve a better sidelobe suppression than the periodic arrays, and the effects of various factors on the sidelobe suppression were analyzed numerically. Experiments were carried out to verify the sidelobe suppression by different Fermat spiral arrays, and the results matched well with the simulations.
coherent beam combining sidelobe suppression Fermat spiral intensity distribution Chinese Optics Letters
2022, 20(2): 021405
光子学报
2021, 50(10): 1022001
Author Affiliations
Abstract
1 School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China
2 State Key Laboratory of Pulsed Power Laser Technology, Hefei 230037, China
3 Xi’an Research Institute of High Technology, Xi’an 710025, China
4 College of Liberal Arts and Sciences, National University of Defense Technology, Changsha 410073, China
5 e-mail: liaojiali@xidian.edu.cn
6 e-mail: xjli@nudt.edu.cn
High-order temporal soliton compression in dispersion-engineered silicon photonic crystal waveguides will play an important role in future integrated photonic circuits compatible with complementary metal–oxide–semiconductors. Here, we report the physical mechanisms of high-order temporal soliton compression affected by third-order dispersion (TOD) combined with free carrier dispersion (FCD) in a dispersion engineered silicon photonic crystal waveguide with wideband low anomalous dispersion. Through numerical temporal soliton evolution analysis, we report what we believe is the first demonstration of the dual opposite effects of TOD on temporal soliton compression, which are strengthening or weakening through two different physical mechanisms, not only depending on the sign of TOD but also the relative magnitude of TOD-induced equivalent group velocity dispersion (GVD) to the original GVD . We further find that FCD counteracts the effects of negative TOD on the soliton compression, while it reinforces the effects of positive TOD on the soliton compression. These results will help to design suitable dispersion-engineered silicon waveguides for superior on-chip temporal pulse compression in optical communications and processing application fields.
Photonics Research
2020, 8(5): 05000729
Author Affiliations
Abstract
We investigate the ultrafast nonlinear phenomena of picosecond chirped non-ideal hyperbolic secant pulse evolution in silicon photonic nanowire waveguides with sum frequency generation cross-correlation frequency-resolved optical gating and nonlinear Schr?dinger equation modeling. Pulse broadening and spectral blue shifts are observed experimentally, and they show remarkable agreements with numerical predictions. Nonlinear losses dominate the pulse broadening and limit the spectral bandwidth broadening induced by self-phase modulation. The initial chirp results in noticeable bandwidth compression and aggravation of blue shifts in the presence of nonlinear losses, whereas it plays a negligible role in the output pulse temporal intensity distribution.
190.7110 Ultrafast nonlinear optics 320.5390 Picosecond phenomena 320.1590 Chirping Chinese Optics Letters
2014, 12(s1): S11905
Author Affiliations
Abstract
We generate a flat temporal-phase distribution optical pulse by 1.3-mm-long photonic crystal waveguide. The effect of coupled pulse energy on the temporal-phase distribution of the output pulse is analyzed by numeral simulating. Simulation results indicate that the root mean square of the output pulse phase decreases to 0.0095 with the optimum coupled pulse energy, which is about 30 pJ, and the narrowest output pulse width is 418 fs. The generation of a flat temporal-phase distribution optical pulse on-chip scale results in potential application prospect in optical communication, pulse compression, pulse shaping and other nonlinear optical application fields.
320.0320 Ultrafast optics 190.4370 Nonlinear optics, fibers 060.0060 Fiber optics and optical communications Chinese Optics Letters
2014, 12(s1): S11903
