Hybrid distributed bragg reflector laser
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United States of America Patent
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Nov 22, 1988
Grant Date -
N/A
app pub date -
Mar 31, 1987
filing date -
Mar 31, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A mechanism for achieving single frequency output in a semiconductor laser diode is disclosed. In accordance with the invention, a conventional laser diode having an anti-reflection coating on its output facet is coupled to a single mode fiber output pigtail having an anti-reflection coating on its input facet. The anti-reflection coatings suppress Fabry-Perot type feedback which would normally be effective for a large number of wavelengths. The fiber includes a built-in distributed Bragg reflector grating, which grating is located just beyond the output fiber input facet. The grating supplies feedback that is effective only over a narrow wavelength band approximating the wavelength spacing between the actual longitudinal modes of the structure so that the laser produces only a single frequency output.
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