  We demonstrate an individual single-walled carbon nanotube light emitter
integrated onto a microcavity and a waveguide operating in the telecom
wavelength regime. Light emission from the carbon nanotube is enhanced at the
cavity resonance and is efficiently extracted from the waveguide facet. We have
transferred carbon nanotubes to a nanobeam cavity with a dry process, ensuring
that an individual carbon nanotube is used. The guided light emission from a
chirality-identified single carbon nanotube has a narrow linewidth of less than
1.3 nm and an off-resonance rejection of $\sim$17 dB. The waveguide-coupled
device configuration is compatible with fully integrated on-chip designs and is
promising for carbon-nanotube-based photonics.
