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 μm, 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.


Civil, Architectural and Environmental Engineering

Second Department

Electrical and Computer Engineering

Keywords and Phrases

Fabry-Perot Interferometers; Optical Fiber Device Fabrication; Optical Fiber Interference; Optical Fiber Transducers; Beam Divergence Angles; Cavity Length; Dynamic Range; Extrinsic Fabry Perot Interferometer; Fringe Visibilities; Fusion Splicing; Graded-Index Fibers; Pitch Length; Ray Matrix; Angle Measurement; Optical Collimators; Signal To Noise Ratio; Single Mode Fibers; Transducers; Visibility

International Standard Serial Number (ISSN)


Document Type

Article - Journal

Document Version

Final Version

File Type





© 2010 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 May 2010