Wavelength-tunable burst-mode receiver

An apparatus, e.g. an optical receiver, includes an optical front end and a processor. The optical front end is configured to coherently receive an input optical signal and convert the input optical signal to a digital-electrical data stream. The processor is configured to recover a data stream from the digital-electrical data stream. The processor is further configured to compare a correlation pattern of the recovered data stream with a pre-determined correlation pattern. The processor is further configured to determine, from the comparison, coefficients of a filter configured to recover data encoded on the input digital-electrical data stream.