  Single-wall carbon nanotube are considered a fascinating nanomaterial for
photonic applications and are especially promising for efficient light emitter
in the telecommunication wavelength range. Furthermore, their hybrid
integration with silicon photonic structures makes them an ideal platform to
explore the carbon nanotube instrinsic properties. Here we report on the strong
photoluminescence enhancement from carbon nanotubes integrated in silicon ring
resonator circuit under two pumping configurations: surface-illuminated pumping
at 735 nm and collinear pumping at 1.26 {\mu}m. Extremely efficient rejection
of the non-resonant photoluminescence was obtained. In the collinear approach,
an emission efficiency enhancement by a factor of 26 has been demonstrated in
comparison with classical pumping scheme. This demonstration pave the way for
the development of integrated light source in silicon based on carbon
nanotubes.
