OE Letters

Adjustable, high-sensitivity optical collimating scheme for free-space optic links

[+] Author Affiliations
Shengli Ding, Jiankun Zhang, Anhong Dang

Peking University, Department of Electronics, 5 Yiheyuan Road, Beijing 100871, China

Opt. Eng. 55(11), 110505 (Nov 23, 2016). doi:10.1117/1.OE.55.11.110505
History: Received July 25, 2016; Accepted November 2, 2016
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Abstract.  In free-space optical (FSO) communications, signal beams suffer from atmospheric turbulence, transmission loss, and pointing errors. With different channel conditions, there exist different optimal divergence angles for the beams. Therefore, a high-performance adjustable collimator for the transmitter is an important component in an FSO system. An adjustable, high-sensitivity, optical collimating scheme is proposed. In the proposed scheme, a graded-index fiber is coated with palladium film and placed in a hydrogen environment and the graded-index fiber can be extended precisely while the palladium atoms react with the hydrogen molecules. Consequently, with different hydrogen pressures, the output beams present different divergence angles. Theoretical analysis and numerical calculation show that the output divergence angle can be precisely adjusted with the system design.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Shengli Ding ; Jiankun Zhang and Anhong Dang
"Adjustable, high-sensitivity optical collimating scheme for free-space optic links", Opt. Eng. 55(11), 110505 (Nov 23, 2016). ; http://dx.doi.org/10.1117/1.OE.55.11.110505


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