| 摘要 |
A series of relatively low reflectivity Bragg gratings are used to stabilize the power and wavelength output of a semiconductor laser. The series of Bragg gratings may be formed in the core of a waveguide, typically either an optical fiber or a planar waveguide circuit, by illuminating the core of the fiber or waveguide through a mask directly through a polymer coating of the fiber or, in the case of a planar waveguide, though the outer layers of the waveguide. The reflectivity of each Bragg grating in the series is less than the reflectivity of the output facet of the laser. The Bragg grating nearest the laser may be located within the coherence distance of the laser. The Bragg gratings may be separated by uniform distance, or the separation between gratings may be non-uniform. Additionally, the gratings may have the same or different periods and reflectivities. The Bragg gratings may be formed in single mode, multimode, polarization-maintaining optical fibers, or other types of optical fibers or solid-state waveguides.
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