Abstract
The authors report the demonstration of the bandgap-tuned InAs quantum dash broadband laser with widened laser emission linewidth at room temperature using postgrowth intermixing technique. The 100 nm wavelength blueshifted, as-cleaved laser exhibits ultrabroad lasing spectral coverage of
∼
85
nm
at a center wavelength of
1.54
μ
m
with a total emission power of
∼
1
W
per device. Compared to the as-grown laser, this laser shows broader lasing bandwidth
(
∼
41
nm
)
with improved spectral ripple
(
<
1
dB
)
.