Method of measuring polarization and birefringence in single-mod

Details Method of measuring polarization and birefringence in single-mod Method of measuring polarization and birefringence in single-mod

1988-05-06

1989-09-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 731, H01J 516

Patent

active

048662666

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.

REFERENCES:
patent: 4675521 (1987-06-01), Sugimoto
patent: 4759624 (1988-07-01), Calvani et al.
S. C. Rashleigh, R. H. Stolen; "Preservation of Polarization in Single-Mode Fibers"; Fiberoptic Technology May 1983; pp. 155, 156, 157, 158, 160, 161.
N. Chinone & R. Ulrich; "Elasto-Optic Polarization Measurement in Optical Fiber"; Optics Letters/vol. 6, No. 1/Jan. 1981; Optical Society of America; pp. 16, 17, 18.
OFC/100C '87/Thursday Morning/204; THD4 Fast Heterodyne Michelson Polarimeter for High-Precision-Fiber Birefringence Measurements; 1 page R. Calvani, R. Caponi, F. Cisternino (1987).

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