scholarly journals Fast beam steering with full polarization control using a galvanometric optical scanner and polarization controller

2012 ◽  
Vol 20 (11) ◽  
pp. 12247 ◽  
Author(s):  
M. Jofre ◽  
G. Anzolin ◽  
F. Steinlechner ◽  
N. Oliverio ◽  
J. P. Torres ◽  
...  
Keyword(s):  
Beam Steering ◽  
Polarization Controller ◽  
Polarization Control ◽  
Optical Scanner

scholarly journals Polarization control algorithm for QKD systems

2021 ◽  
Vol 2086 (1) ◽  
pp. 012092
Author(s):  
E E Mekhtiev ◽  
I S Gerasin ◽  
N V Rudavin ◽  
A V Duplinsky ◽  
Y V Kurochkin
Keyword(s):  
Real Time ◽  
Quantum Channel ◽  
Gradient Descent ◽  
Control Algorithm ◽  
Continuous Operation ◽  
Polarization Controller ◽  
Fiber System ◽  
Polarization Control ◽  
Polarization Encoding ◽  
Proper Operation

Abstract The crucial task for polarization-encoding fiber QKD is to compensate polarization drift occurring in a quantum channel. To solve this problem, the receiver usually uses a polarization controller. For proper operation, this device must be efficiently managed in real-time. In this work, a gradient-descent-based algorithm is proposed to solve this problem. The algorithm was implemented and tested on a QRate commercial QKD fiber system, that utilizes BB84-protocol. Low and stable QBER has been obtained during a day of continuous operation.

The Effect of Polarization Control in Loss-Compensated Recirculating Delayed Self-Heterodyne Interferometry Measurement of Laser Linewidth

2013 ◽  
Vol 303-306 ◽  
pp. 859-862
Author(s):  
Si Ya Dong Xiong ◽  
Yi Yang ◽  
Chao Peng ◽  
Zhen Rong Zhang ◽  
Zheng Bin Li
Keyword(s):  
Theoretical Analysis ◽  
Polarization Controller ◽  
Laser Linewidth ◽  
Heterodyne Interferometry ◽  
Polarization Model ◽  
Ring Interferometer ◽  
Polarization Control ◽  
Inaccurate Estimation

In the implementation of the loss-compensated recirculating delayed self-heterodyne interferometry (LC-RDSHI) measurement of laser linewidth, we observe the fluctuations among the different orders of beat spectra, which are not expected according to theoretical analysis and may lead to the distortion of lineshape and inaccurate estimation of the laser linewidth. To explain the observation, we in this paper simplify the polarization model in the recirculating heterodyne ring interferometer containing a polarization controller (PC) and point out the effect of the polarization control in the LC-RDSHI measurement. The simulation result of our model explains well the observed fluctuations.

Symmetric-pair antennas for beam steering, direction finding or isotropic-reception gain

1991 ◽  
Vol 138 (4) ◽  
pp. 368 ◽  
Author(s):  
R. Benjamin ◽  
W. Titze ◽  
P.V. Brennan ◽  
H.D. Griffiths
Keyword(s):  
Beam Steering ◽  
Direction Finding ◽  
Symmetric Pair

An Equivalent Circuit Model for Vertical Comb Drive MEMS Optical Scanner Controlled by Pulse Width Modulation

2012 ◽  
Vol 132 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Satoshi Maruyama ◽  
Muneki Nakada ◽  
Makoto Mita ◽  
Takuya Takahashi ◽  
Hiroyuki Fujita ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Comb Drive ◽  
Optical Scanner

Electromagnetically Driven 2-axis Optical Beam Steering MEMS Mirror and Its Dependence of Actuation on Magnetic Field

2010 ◽  
Vol 130 (4) ◽  
pp. 107-112 ◽  
Author(s):  
Yoshiyuki Watanabe ◽  
Yutaka Abe ◽  
Shinnosuke Iwamatsu ◽  
Seiya Kobayashi ◽  
Yoshiyuki Takahashi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Beam Steering ◽  
Optical Beam

An Optimized Scheme for Optical Phased Array Beam Steering Controlled by Wavelength

PIERS Online ◽  
2007 ◽  
Vol 3 (2) ◽  
pp. 127-131 ◽  
Author(s):  
Ying Zhao ◽  
Xiaozhou Yang ◽  
Qin Cai ◽  
Weiwei Hu
Keyword(s):  
Phased Array ◽  
Beam Steering ◽  
Optical Phased Array
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