  We propose a scheme to manipulate strong and nonreciprocal photon blockades
in asymmetrical Fabry-Perot cavity with a $\Lambda$-type three-level atom.
Utilizing the mechanisms of both conventional and unconventional blockade, the
strong photon blockade is achieved by the anharmonic eigenenergy spectrum
brought by $\Lambda$-type atom and the destructive quantum interference effect
induced by a microwave field. By optimizing the system parameters, the
manipulation of strong photon blockade over a wide range of cavity detuning can
be realized. Using spatial symmetry breaking introduced by the asymmetry of
cavity, the direction-dependent nonreciprocal photon blockade can be achieved,
and the nonreciprocity can reach the maximum at optimal cavity detuning. In
particular, manipulating the occurring position of nonreciprocal photon
blockade can be implemented by simply adjusting the cavity detuning. Our scheme
provides feasible access for generating high-quality nonreciprocal
single-photon sources.
