Redundant multi-wavelength laser arrays
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United States of America Patent
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Mar 18, 1997
Grant Date -
N/A
app pub date -
Apr 20, 1995
filing date -
Apr 20, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A semiconductor integrated-circuit laser array including redundant lasers that is particularly useful in a wavelength-division multiplexed communication system requiring N channels regularly spaced in wavelength. According to a first aspect of the invention, a plurality of lasers are designed to operate at the same wavelength so that a single inoperative laser will not prevent the laser array from operating. Further, sets of lasers are chosen which have wavelength spacings closest to the design spacing. According to a second aspect of the invention, the laser array includes lasers with spacings in between the design wavelengths. Thereby, if all the lasers systematically vary in wavelength, a set of lasers can be selected that will operate not far from their nominal operating wavelength.
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