Signal processing apparatus and optical receiving apparatus

A signal processing device included in an optical reception device configured to receive a burst optical signal transmitted by one of a plurality of optical transmission devices, the signal processing device comprising:

• a symbol timing detecting unit configured to detect a symbol timing based on sample signals obtained by oversampling the burst optical signal converted into an electric signal with a sampling rate higher than a symbol rate;
• an adaptive equalization filter unit configured to perform an equalization process on the sample signals;
• and
• a timing matching unit configured to match timing such that, when the adaptive equalization filter unit takes in the sample signals, one of the taken-in sample signals corresponding to the symbol timing is given to a tap of which a tap coefficient has a maximum value among taps included in the adaptive equalization filter unit,
• wherein the timing matching unit includes an input timing adjusting unit configured to take in the sample signals and give the one of the taken-in sample signals corresponding to the symbol timing to the tap of which the tap coefficient has the maximum value by adjusting a timing at which the taken-in sample signals are output to the adaptive equalization filter unit, and
• wherein the input timing adjusting unit includes a delay amount calculating unit configured to calculate an amount of delay based on the symbol timing detected by the symbol timing detecting unit and a position of the tap of which the tap coefficient has the maximum value.