Optical waveguides – With optical coupler – Input/output coupler
Patent
1995-10-31
1997-12-02
Palmer, Phan T. H.
Optical waveguides
With optical coupler
Input/output coupler
385 10, 385 12, 372102, G02B 634
Patent
active
056945019
ABSTRACT:
The present invention provides a method and apparatus for controlling the detailed strain field imposed on a guided-wave Bragg grating. The spectral and temporal form of radiant energy traveling down optical fibers is important in many fields, including communications and sensing. The spectral distribution and center wavelength of short optical pulses is of particular importance. In the communication field the information carrying capacity of an optical fiber can be limited by the dispersion experienced by short pulses as they propagate along an optical fiber. Chirped fiber optic intracore Bragg gratings can be used to compensate for this dispersion. However, a grating with a different degree of chirp would be required for each particular communication system. This control of the intra-grating strain distribution allows the grating to be tuned over a broad spectral range or chirped in a manner that permits it to compensate for a wide range of dispersion with or without a shift in the grating center wavelength. In addition, precise control of the strain distribution along a grating can be used to manufacture a variety of spectral filters.
REFERENCES:
patent: 4474427 (1984-10-01), Hill et al.
patent: 4953939 (1990-09-01), Epworth
patent: 5007705 (1991-04-01), Morey et al.
patent: 5317576 (1994-05-01), Leonberger et al.
Alavie A. Tino
Huang Shangyuan
LeBlanc Michael J.
Maaskant Robert
Measures Raymond M.
Electrophotonics Corporation
Palmer Phan T. H.
Schumacher Lynn C.
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