Mode converters with periodicallynonuniform waveguide walls

2011 ◽  
pp. 226-234
Keyword(s):  
Mode Converters

scholarly journals A mode generator and multiplexer at visible wavelength based on all-fiber mode selective coupler

Nanophotonics ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 973-981 ◽  
Author(s):  
Han Yao ◽  
Fan Shi ◽  
Zhaoyang Wu ◽  
Xinzhu Xu ◽  
Teng Wang ◽  
...  
Keyword(s):  
Phase Shift ◽  
Intensity Distribution ◽  
Linear Polarization ◽  
Mode Conversion ◽  
Polarization State ◽  
Stimulated Emission ◽  
Wavelength Multiplexing ◽  
Mode Converters ◽  
Fiber Mode ◽  
Vortex Beams

AbstractUsing an all-fiber mode selective coupler (MSC) at the visible band, here we experimentally demonstrate a generating and wavelength multiplexing scheme for the cylindrical vector (CV) and vortex beams (VBs). The proposed MSCs act as efficient mode converters to produce spectrally insensitive high-order modes (HOMs) at the wavelength ranging from 450 to 980 nm, which have broad operation bandwidth (more than 7 nm), high mode conversion efficiency (94%), and purity (98%), and low insert loss (below 0.5 dB). By adjusting the polarization state and the phase shift of linear polarization (LP)11 mode respectively, the donut-shaped CVs and circular-polarization VBs are achieved. The focused intensity distribution of the donut beam on the cross- and axial-sections is monitored by using a confocal system. The all-fiber solution of producing and multiplexing HOMs opens a new route for stimulated emission depletion microscopy applications.

Vector Mode Converters Based on Cascaded LPFGs in Elliptical Ring-Core Fiber

2021 ◽  
Author(s):  
Xiaoqian Wang ◽  
Hu Zhang ◽  
Jingxuan Yang ◽  
Xiaoguang Zhang ◽  
Lixia Xi ◽  
...  
Keyword(s):  
Elliptical Ring ◽  
Vector Mode ◽  
Mode Converters ◽  
Core Fiber ◽  
Ring Core

scholarly journals Advanced and Innovative Optimization Techniques in Controllers: A Comprehensive Review

2021 ◽  
Vol 9 (3) ◽  
pp. 23-27
Author(s):  
Aditya Tiwary
Keyword(s):  
Power Factor ◽  
Electronic Circuit ◽  
Power Factor Correction ◽  
Optimization Techniques ◽  
Power Electronic ◽  
Comprehensive Review ◽  
Boost Converters ◽  
Mode Converters ◽  
Circuit And System ◽  
Switching Mode

New commercial power electronic controllers come to the market almost every day to help improve electronic circuit and system performance and efficiency. In DC–DC switching-mode converters, a simple and elegant hysteretic controller is used to regulate the basic buck, boost and buck–boost converters under slightly different configurations. In AC–DC converters, the input current shaping for power factor correction posts a constraint. But, several brilliant commercial controllers are demonstrated for boost and fly back converters to achieve almost perfect power factor correction. In this paper a comprehensive review of the various advanced optimization techniques used in power electronic controllers is presented.

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