Spatial dynamics of the output speckle pattern of multimode fiber excited by frequency-sweeping He-Ne laser

1996 ◽  
Author(s):  
Garif G. Akchurin ◽  
Leonid A. Melnikov ◽  
Elena A. Romanova
Keyword(s):  
Speckle Pattern ◽  
Spatial Dynamics ◽  
Multimode Fiber ◽  
Frequency Sweeping

scholarly journals Deep Learning-Based Image Classification through a Multimode Fiber in the Presence of Wavelength Drift

2020 ◽  
Vol 10 (11) ◽  
pp. 3816
Author(s):  
Eirini Kakkava ◽  
Navid Borhani ◽  
Babak Rahmani ◽  
Uğur Teğin ◽  
Christophe Moser ◽  
...  
Keyword(s):  
Classification Accuracy ◽  
Deep Neural Networks ◽  
Speckle Pattern ◽  
Tunable Laser ◽  
Multimode Fiber ◽  
High Classification Accuracy ◽  
Highly Sensitive ◽  
Speckle Patterns ◽  
Large Wavelength

Deep neural networks (DNNs) are employed to recover information after its propagation through a multimode fiber (MMF) in the presence of wavelength drift. The intensity distribution of the speckle patterns generated at the output of an MMF when an input wavefront propagates along its length is highly sensitive to wavelength changes. We use a tunable laser to implement a wavelength drift with a controlled bandwidth, aiming to estimate the DNN’s performance in different cases and identify the limitations. We find that when the DNNs are trained with a dataset which includes the noise induced by wavelength changes, successful classification of a speckle pattern can be performed even for a large wavelength bandwidth drift. A single training step is found to be sufficient for high classification accuracy, removing the need for time-consuming recalibration at each wavelength.

Stabilization of the speckle pattern of a multimode fiber undergoing bending

1996 ◽  
Vol 21 (11) ◽  
pp. 785 ◽  
Author(s):  
D. Z. Anderson ◽  
M. A. Bolshtyansky ◽  
B. Ya. Zel’dovich
Keyword(s):  
Speckle Pattern ◽  
Multimode Fiber

Long Period Gratings in Multimode Fiber Fabricated with High-Energy Ion Implantation

2003 ◽  
Vol 22 (4) ◽  
pp. 225-237
Author(s):  
K. J. GRANT ◽  
ROBERTS A. ◽  
D. N. JAMIESON ◽  
B. ROUT ◽  
C. CHER
Keyword(s):  
Ion Implantation ◽  
High Energy ◽  
Multimode Fiber ◽  
Long Period ◽  
Long Period Gratings

Sozial-räumliche Dynamiken der Agrartreibstoffe.

2016 ◽  
Vol 46 (184) ◽  
pp. 423-440 ◽  
Author(s):  
Kristina Dietz ◽  
Bettina Engels ◽  
Oliver Pye
Keyword(s):  
Political Economy ◽  
Capital Flows ◽  
Spatial Dynamics ◽  
Financial Sector ◽  
Comprehensive Analysis ◽  
Spatial Theory ◽  
Global Political Economy

This article explores the spatial dynamics of agrofuels. Building on categories from the field of critical spatial theory, it shows how these categories enable a comprehensive analysis of the spatial dynamics of agrofuels that links the macro-structures of the global political economy to concrete, place-based struggles. Four core socio-spatial dynamics of agrofuel politics are highlighted and applied to empirical findings: territorialization, the financial sector as a new scale of regulation, place-based struggles and transnational spaces of resources and capital flows.

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