Fringe Visibility Enhanced Extrinsic Fabry–Perot Interferometer Using a Graded Index Fiber Collimator

Author

Zhang, Yinan ; Li, Yanjun ; Wei, Tao ; Lan, Xinwei ; Huang, Ying ; Chen, Genda ; Xiao, Hai

Author_Institution

Electr. & Comput. Eng., Missouri Univ. of Sci. & Technol., Rolla, MO, USA

Volume

2

Issue

3

fYear

2010

fDate

6/1/2010 12:00:00 AM

Firstpage

469

Lastpage

481

Abstract

We report a fringe visibility-enhanced extrinsic Fabry-Perot interferometer (EFPI) by fusion splicing a quarter-pitch length of a graded-index fiber (GIF) to the lead-in single mode fiber (SMF). The performance of the GIF collimator is theoretically analyzed using a ray matrix model and experimentally verified through beam divergence angle measurements. The fringe visibility of the GIF-collimated EFPI is measured as a function of the cavity length and compared with that of a regular SMF-EFPI. At the cavity length of 500 m, the fringe visibility of the GIF-EFPI is 0.8, while that of the SMF-EFPI is only 0.2. The visibility-enhanced GIF-EFPI may provide a better signal-to-noise ratio (SNR) for applications where a large dynamic range is desired.

Keywords

Fabry-Perot interferometers; fibre optic sensors; gradient index optics; optical collimators; optical fibre fabrication; beam divergence angle measurements; fringe visibility enhanced extrinsic Fabry-Perot interferometer; fusion splicing; graded index fiber collimator; lead-in single mode fiber; quarter-pitch length; ray matrix model; Dynamic range; Length measurement; Lenses; Magnetic sensors; Optical collimators; Optical fiber devices; Optical fiber sensors; Optical fibers; Optical interferometry; Optical sensors; Fabry–Perot interferometers; Optical fiber device fabrication; Optical fiber interference; Optical fiber transducers;

fLanguage

English

Journal_Title

Photonics Journal, IEEE

Publisher

ieee

ISSN

1943-0655

Type

jour

DOI

10.1109/JPHOT.2010.2049833

Filename

5462843