Liquid-crystal polarization stabilizers on fiber arrays

We have built polarization stabilizer arrays of ultrathin liquid-crystal (LC) polarization controller (PC) arrays and a tap-type photodetector array on a fiber array. The ultrathin (35-/spl mu/m-thick) LC cells are inserted into trenches cut across the fiber array, which is affixed to V grooves in a...

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Bibliographic Details
Published in:Journal of lightwave technology 2003-10, Vol.21 (10), p.2162-2171
Main Authors: Hirabayashi, K., Amano, C.
Format: Article
Language:English
Subjects:
Applied sciences
Arrays
Circuit properties
Control theory
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Feedback
Feedback control
Fibers
Integrated optics. Optical fibers and wave guides
Multichannel
Optical and optoelectronic circuits
Optical arrays
Optical attenuators
Optical fiber devices
Optical fiber polarization
Optical filters
Optical polarization
Optical receivers
Photodetectors
Polarization
Programmable control
Stimulated emission
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Summary:We have built polarization stabilizer arrays of ultrathin liquid-crystal (LC) polarization controller (PC) arrays and a tap-type photodetector array on a fiber array. The ultrathin (35-/spl mu/m-thick) LC cells are inserted into trenches cut across the fiber array, which is affixed to V grooves in a glass plate and are used to change the phase of 1.55-/spl mu/m lights from 0.5 to 3.9/spl pi/ with the application of less than 3 Vrms. Two cascaded ultrathin LC cells, where the directions of alignment of the LCs are rotated by 45/spl deg/ relative to each other, are capable of converting light with an arbitrary input polarization to the transverse electric (TE) or transverse magnetic (TM) polarization. We fabricated a multichannel TE- and TM-polarization stabilizer of the previously mentioned 16-channel LC PC array and a feedback system made up of a multichannel tap-type photodetector array, sheet polarizer, and a computer and analog-to-digital converters. Feedback control was applied to maximize and minimize the tapped light, to convert an arbitrary input polarization to TM or TE output polarization, and stabilize it in the given state.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2003.816828