Method of modifying the longitudinal distribution of the pitch o

Details Method of modifying the longitudinal distribution of the pitch o Method of modifying the longitudinal distribution of the pitch o

1995-08-02

1997-03-18

Ullah, Akm E.

Optical waveguides

With optical coupler

Input/output coupler

G02B 634

Patent

active

056130236

ABSTRACT:
To modify the longitudinal pitch distribution of a diffraction grating, longitudinal dimensional variation is imparted, over time, to a support along the entire length of a line on which said support carries, at least indirectly, a succession of diffraction elements of the grating. By way of example, the support is an auxiliary part on which an optical fiber is stuck, said fiber including said grating. An elongation coefficient dl/l represents the local relative value of dimensional variation. This value varies along said line. The invention is particularly applicable to making variable pitch light-refracting filters in optical fiber telecommunications systems.

REFERENCES:
patent: 4474427 (1984-10-01), Hill et al.
patent: 4636031 (1987-01-01), Schmadel, Jr. et al.
patent: 5321257 (1994-06-01), Danisch
"Strain Gradient Chrip of Fibre Bragg Gratings" by Hill et al., vol. 30. No. 14, Jul. 7, 1994, pp. 1172-1174.
Electronics Letters., vol. 30, No. 14, 7 Jul. 1994, Enage GB, pp. 1172-1174, P. C. Hill, "Strain Gradient Chirp of Fibre Bragg Gratings".
IEEE Photonics Technology Letters, vol. 6, No. 7, Jul. 1994, New York, US, pp. 839-841, Q. Zhang et al, pp. 839-841, Q. Zhang et al, "Tuning Bragg wavelength by writing gratiings on prestrained fibers".

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