Vladimir Krull, a 12-year veteran of the department assigned to the Midtown North Precinct, had also served as a Marine in Iraq.
The three ghastly attacks on the teen took place in 2013 and 2014.
The victim was the daughter of Krull’s then-girlfriend.
Bronx prosecutors said he first kissed her on the mouth in September 2013 — then proceeded to abuse her further.
The abuse escalated — and he raped the victim in her home and in his car during two separate incidents, jurors found.
Krull, 39, was also convicted of making the victim perform a sex act on him in his car in June 2014 after a father-daughter breakfast for her eighth-grade class.
A spokeswoman for Bronx District Attorney Darcel Clark confirmed that Supreme Court Justice Lester Adler had sentenced Krull to just three years for each incident of abuse, which will run concurrently.