Patent
Method of measuring polarization and birefringence in single-mode optical fibers
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TLDR
In this article, a constant force perpendicular to the fiber axis is applied to the optical fiber so as to cause a power coupling from the fundamental mode, which is guided, to a secondary mode which is irradiated, and the intensity of the scattered radiation associated with that secondary mode is measured.Abstract:
A constant force perpendicular to the fiber axis is applied to the fiber so as to cause a power coupling from the fundamental mode, which is guided, to a secondary mode which is irradiated, and the intensity of the scattered radiation associated with that secondary mode is measured. Such intensity depends on the local state of polarization. By dispacing the force application point step by step along the fiber axis and by measuring for each point the intensity of the scattered radiation, beat length is obtained as the distance between two consecutive points where the scattered radiation has the same intensity.read more
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References
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Journal ArticleDOI
Elasto-optic polarization measurement in optical fiber.
N Chinone,R Ulrich +1 more
TL;DR: A method is described for the nondestructive determination of the state of polarization of the guided light at an arbitrary point along a single-mode fiber using elasto-optic polarization modulation.
Patent
Apparatus and method for determining the orientation of axes of birefringence in an optical fiber
TL;DR: In this article, an apparauts and process for accurate alignament of the birefrigent axes of circular fibers, and differentiation between the fast and slow axes utilizing an externally induced stress bireringence to change the orientation and magnitude of the natural fiber birerringence at a selected point along the length of the fiber (24) is disclosed.
Patent
Trolley apparatus for transmitting light signals
Abstract: A transparent optical cable 5 including a flexible core 5a and a flexible but stiffer cladding 5b transmits light signals axially through the core. When a transparent contact plate 7 or roller 10 depresses and flatteningly distorts the cable, the light signals leak out through the core-cladding interface at the depressed portion and are transmitted through the plate or roller to a photoelectric transducer 8 or 12 mounted on the plate or proximate the roller on a movable object 1, which converts the light signals to electrical signals. Signal transmissions into the cable are also possible, and the input-output signal coupling depression may be made at any point along the length of the cable.
Patent
Method of and apparatus for measuring polarization beat-length in highly-birefringent single-mode optical fibres
Riccardo Calvani,Gianni Coppa +1 more
TL;DR: In this paper, a constant force perpendicular to the fiber axis is applied to the fibre and is displaced step by step along the fibre axis, and the state of polarization of a radiation outgoing from the fibre is determined at each step and the beat-length values are obtained from both the amplitude ratio and the phase difference between the components, along two birefringence axes, of the electrical field associated with a radiation launched into the fibre.
Patent
Core deformation measurement in optical fibre - uses light detector which is moved in circles in planes perpendicular to axis of fibres
TL;DR: In this article, a photoelectric transducer scans the whole length of the monomode optical fiber and receives the leakage radiation emitted by the fibre surface, which is fed into the end face of the optical fiber.