Carsten Bunk started his rowing career as a single sculler and won a youth silver medal at the 1977 World Championships and gold medal at the 1978 Senior Worlds. He then moved to the quadruple sculls and won the gold medal at the 1980 Moskva Olympics. That same year he also won his only East German national title, in the single sculls. In 1982 he retired for unknown reasons.
Bunk studied medicine, but did not conclude his studies. After re-unification he owned a small hostel with his wife at Rathen in Saxon Switzerland.