Optical waveguides – With optical coupler – Input/output coupler
Patent
1995-12-14
1997-08-05
Ullah, Akm E.
Optical waveguides
With optical coupler
Input/output coupler
G02B 634
Patent
active
056550405
ABSTRACT:
A laser source supplies a primary laser beam. A phase grating generates two secondary beams from the primary beam so as to form interference fringes that are inscribed in an optical fiber by photo-refraction. An optical system of variable focal length varies the gap between the interference fringes so as to vary the pitch of the Bragg grating discretely for successive segments of the optical fiber. Means displace the primary laser beam and the optical fiber relative to each other by successive segments of said fiber. These means are synchronized with the variation of the focal length of the optical system. Application to telecommunications.
REFERENCES:
J.D. Prohaska et al, "Magnification of Mask Fabricated Fibre Bragg Gratings", Electronics Letters, vol. 29, No. 18, Sep. 2, 1993, Enage GB, pp. 1614-1615.
P.Y. Fonjallaz et al, "Direct determination of main fibre Bragg grating parameters using OLCR", IEE Proceedings J. Optoelectronics, vol. 141, No. 2, Apr. 1994, Stevenage GB, pp. 141-144.
S. J. Mihailov et al, "Recording of Efficient high-order Bragg reflectors in optical fibres by mask image projection and single pulse exposure with an excimer laser", Electronics Letters, vol. 30, No. 9, Apr. 28, 1994, Enage GB, pp. 707-709.
Chesnoy Jose
Riant Isabelle
Sansonetti Pierre
ALCATEL N.V.
Ullah Akm E.
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