  Self-injection locking is a dynamic phenomenon which provides passive
stabilization of a lasers emission frequency via resonant optical feedback. The
stabilization coefficient depends on the level of resonant feedback and quality
factor of the external resonant structure creating the feedback. Usually a
self-injection locked laser (SIL) involves barely tunable resonant Rayleigh
scattering (RRS). In this work we study theoretically a scheme of a SIL to a
high-Q microresonator with drop-port coupled mirror, in which optical feedback
level is optimally adjusted by the tuning the drop-port mirror coupling. We
show that the additional reflector can improve the laser stabilization and
power handling efficiency if compared with the classic RRS-based scheme.
