Reception apparatus and non-transitory computer readable medium

A non-transitory computer readable medium stores a program that, when executed by one or more processors of a reception apparatus having receiving unit configured to coherently detect, based on local light, an optical signal containing modulated light and pilot light, and output an electrical signal containing a modulated signal corresponding to the modulated light and a pilot signal corresponding to the pilot light, causes the one or more processors to execute:

• first compensating processing of detecting a frequency of the pilot signal by performing a discrete Fourier transform of the electrical signal output by the receiving unit, and determining and compensating for frequency error in the electrical signal based on error in the frequency detected relative to a reference frequency;
• frequency converting processing of converting the frequency of the pilot signal after the compensating by the first compensating processing such that the frequency of the pilot signal is lowered by the reference frequency;
• and
• second compensating processing of determining frequency error in the modulated signal after the compensating by the first compensating processing by performing a discrete Fourier transform on the pilot signal after the frequency converting processing and detecting a frequency of the pilot signal after the frequency converting processing, and compensating for the frequency error in the modulated signal after the compensating by the first compensating processing.