Low temperature distributed feedback laser with loss grating and method
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United States of America Patent
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Dec 7, 2004
Grant Date -
Jan 2, 2003
app pub date -
Sep 6, 2002
filing date -
Nov 15, 1999
priority date (Note) -
Expired
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Abstract
A low threshold distributed feedback (DFB) laser is constructed for improved performance at subzero temperatures. A loss grating is employed to enhance the probability that lasing occurs near the short wavelength side of the stopband and to counteract the effect of negative gain tilt that occurs when DFB lasers are positively detuned. A method of making DFB lasers from wafers with improved yield for low temperature side mode suppression ratio (SMSR) is also disclosed.
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