Chen, KP
(2005)
In-fiber light powers active fiber optical components.
Photonics Spectra, 39 (4).
ISSN 0731-1230
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Abstract
The tuning of a fiber Bragg grating with optical power was demonstrated. The grating was written in Corning SMF-28 standard single-mode fiber and the reflection spectrum was monitored from a broadband source using an Ando 6317C optical analyzer. The fiber was fusion-spliced to a 100-μm-core multimode fiber with a 140-μm diameter and a numerical aperture of 0.22. 10 W of 910-nm laser radiation from a high-power diode laser was coupled into the end of the multimode fiber using a pair of 20X microscope objectives. Using the cut-back method, it was estimated that 90 percent of the IR radiation was lost within the 10-cm section of the single-mode fiber closest to the fusion-spliced junction. The leaking radiation was subsequently absorbed by the metallic coating, which created heat and raised the temperature of the fiber Bragg grating. The temperature gradient modified the spectral response of the grating and introduced a frequency chirp.
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