Single all-optical platform for measurement of twist and transverse stress using polarization modulation in distinct dual-mode fiber placed in a Sagnac loop

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
Saba N KhanPartha Roy Chaudhuri

Abstract

We report here the experimental demonstration of measurement of both twist and transverse stress using polarization modulation in a single all-fiber circuit consisting of a single-mode fiber (SMF)/dual-mode fiber (DMF) in a Sagnac interferometer (SI) loop. The SMF-SI prototype setup is seen to be suitable for precise measurement of twist over a broad range of ±50° and transverse stress up to 5 N with a sensitivity as high as 2.85×10(6)  pW/° and 2.08×10(7)  pW/N, respectively. It is envisaged that nearly ideal operation for twist measurement can be achieved by appropriately selecting the operating domain (pretwisted Sagnac loop for practical realization of the device) and required magnitude of applied transverse stress (weight yielding maximum sensitivity). Unlike SMF-SI, a DMF assisted SI exhibits asymmetric transmittance yielding a peak shift (∼45°) in addition to falling/rising peak amplitude of effective power(∼20  μW). This key characteristic is further utilized for tunable measurement of torsion (unidirectional from -70° to 40°) while keeping the sensitivity fixed. This research problem is then analyzed on the avenue of theoretical consideration and using classical polarization optics; we have derived the Jones birefringe...Continue Reading

References

Feb 1, 1978·Journal of the Optical Society of America·P McIntyre, A W Snyder
Jul 1, 1979·Applied Optics·R Ulrich, A Simon
May 1, 1979·Applied Optics·G B Hocker
May 23, 2013·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Saba N KhanPartha Roy Chaudhuri

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