9.1 98.98.8
.
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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