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Exciton spin and related optical polarization in self-assembledInAs/In$_{0.53}$Ga$_{0.23}$Al$_{0.24}$As/InP(001) quantum dashes emitting at1.55 {\mu}m are investigated by means of polarization- and time-resolvedphotoluminescence, as well as photoluminescence excitation spectroscopy, atcryogenic temperature. We investigate the influence of highly non-resonant andquasi-resonant optical spin pumping conditions on spin polarization and spinmemory of the quantum dash ground state. We show that a spin pumping scheme,utilizing the longitudinal-optical-phonon-mediated coherent scattering process,can lead to the polarization degree above 50%. We discuss the role of intrinsicasymmetries in the quantum dash that influence values of the degree ofpolarization and its time evolution.

Exciton spin relaxation in InAs/InGaAlAs/InP(001) quantum dashes emitting near 1.55 {\mu}m