Alpes Lasers . TC-3 Datasheet Page 13

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How does a DFB work?
Fabry-Pérot
laser:
Amplified light bounces
in the cavity
DFB:
periodic grating => waves coupling
=> high wavelength
selectivity
gain
gain
1095 1100 1105 1110 1115 1120 1125 1130 1135 1140
9.1 98.98.8
Frequency [cm
-1
]
Wavelength [µm]
Intensity [a.u.]
220 K
200 K
180 K
stopband
∆ν = 1.19 cm
-1
complex-coupled DFB:
• lasing mode closest to the stopband
• stopband § coupling strength
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Distributed-feedback technologies
Grating close to active region
lower thermal resistance
(high duty / high temperature)
high average power
higher overlap, smaller losses
jct dn mounting possible
needs MOCVD regrowth
Grating on the surface (open-top)
one MBE run (no MOCVD)
high peak power (large stripes)
but low average power
optical losses due to metalization
C. Gmachl et al. IEEE Photon.
Technol. Lett., vol. 9, p.1090, 1997)
D. Hofstetter et al., Appl. Phys. Lett.,
vol. 75, p.665, 1999)
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