COMPARISON OF TWISTED AND PARALLEL NEMATIC LIQUID-CRYSTAL POLARIZATION CONTROLLERS - APPLICATION TO A 4X4 FREE-SPACE OPTICAL SWITCH AT 1.5 MU-M

Authors
PAIN F COQUILLE R VINOUZE B WOLFFER N GRAVEY P
Citation
F. Pain et al., COMPARISON OF TWISTED AND PARALLEL NEMATIC LIQUID-CRYSTAL POLARIZATION CONTROLLERS - APPLICATION TO A 4X4 FREE-SPACE OPTICAL SWITCH AT 1.5 MU-M, Optics communications, 139(4-6), 1997, pp. 199-204
Citations number
6
Categorie Soggetti
Optics
Journal title
Optics communications → ACNP
ISSN journal
00304018
Volume
139
Issue
4-6
Year of publication
1997
Pages
199 - 204
Database
ISI
SICI code
0030-4018(1997)139:4-6<199:COTAPN>2.0.ZU;2-G
Abstract
This paper describes the design of a polarisation controller using a n ematic Liquid crystal in the infrared. Theoretical comparison of paral lel and twisted structures is made. Our samples reach 30 dB contrast a nd 1.4 dB insertion loss. Twisted nematic cells were used to perform a 4 X 4 strictly non-blocking optical switch at 1.5 mu m with 15.2 dB f ibre to fibre loss and less than -28 dB cross-talk.