This paper provides research progress in the development of fast electro-optic gratings for laser beam attenuations and in free space optical (FSO) communications involving mobile terminals. The electro-optic phase grating is formed by the phase separation of ~100nm liquid crystals droplets from a polymerizing organic matrix using holographic interference technique. The formed grating separates the incident laser beam into the output beams: the transmitted and diffracted beam, whose intensities can be electrically adjusted through electro-optic effect. The fast electro-optic gratings have a very fast electro-optic response time of 50 μs with diffraction efficiency above 99.8%. Optical receivers used in FSO have a limited dynamic range and there is a need for in-line variable attenuators to keep the signal levels from overloading the receiver. These attenuators should be continuous, provide sufficient attenuation, and also provide a low insertion loss for weak signal reception. The use of electro-optic phase gratings is one solution to meet the requirements for an in-line attenuator for FSO.

Date Published: 5 February 2008
PDF: 12 pages
Proc. SPIE 6838, Optoelectronic Devices and Integration II, 68380A (5 February 2008); doi: 10.1117/12.771481

Published in SPIE Proceedings Vol. 6838:
Optoelectronic Devices and Integration II
Xuping Zhang; Hai Ming; Maggie Yihong Chen, Editor(s)