Title :
Liquid-crystal level equalizer arrays on fiber arrays
Author :
Hirabayashi, K. ; Amano, C.
Author_Institution :
NTT Photonics Labs., NTT Corp., Kanagawa, Japan
Abstract :
We have developed simple and inexpensive level equalizer arrays using 8- to 16-channel independent liquid-crystal (LC) variable-optical-attenuator (VOA) arrays and multichannel in-line photodetector arrays, which were integrated on fiber arrays. We used two types of LC-VOAs: 1) ultrathin LC cells inserted into trenches cut across the fiber arrays, and 2) LC filling the gap between transparent electrode-coated fibers of the fiber splicer. The pitch of the fibers was 250 μm, and the number of fibers ranged from 8 to 16. These level equalizer arrays can suppress 2-Hz power fluctuations to a desired constant power level by using a dithering feedback circuit.
Keywords :
equalisers; integrated optics; liquid crystal devices; optical arrays; optical attenuators; optical communication equipment; optical feedback; optical fibres; optical materials; photodetectors; 16-channel independent liquid-crystal variable-optical-attenuator arrays; 2 Hz; 2-Hz power fluctuations suppression; 250 mum; 8-channel independent liquid-crystal variable-optical-attenuator arrays; dithering feedback circuit; electrode-coated fibers; fiber arrays; fiber pitch; fiber splicer; liquid-crystal level equalizer arrays; multichannel in-line photodetector arrays; ultrathin LC cells; Equalizers; Fabrication; Glass; Indium tin oxide; Optical arrays; Optical attenuators; Optical feedback; Optical fiber cables; Optical fiber polarization; Photodetectors;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2003.822232
