  Fiber-coupled single photon sources are essential components of
photonics-based quantum information processors. Most fiber-coupled single
photon sources require careful alignment between fibers and quantum emitters.
In this work, we present an alignment-free fiber-integrated single photon
source based on an InAs/InP quantum dot emitting at telecom wavelengths. We
designed a nanobeam containing the quantum dots attached to a fiber taper. The
adiabatic tapered coupler of the nanobeam enables efficient light coupling to
the fiber taper. Using a tungsten probe in a focused ion beam system, we
transferred the nanobeam to the fiber taper. The observed fiber-coupled single
photon emission occurs with a brightness of 1.5% and purity of 86%. This device
provides a building block for fiber-optic quantum circuits that have various
applications, such as quantum communication and distributed quantum computing.
