Optical PDM-QAM burst mode system with OFDM synchronisation symbols

摘要

The present document relates to optical transmission. In particular, the present document relates to the synchronisation and adaption of a coherent optical receiver for polarisation division multiplexed (PDM) transmission systems. A transmitter (110) of an optical polarization division multiplexed, PDM, signal is described; wherein the PDM signal comprises a first signal component (810) in a first optical polarization plane and a second signal component (820) in a second optical polarization plane; the transmitter (110) comprising a symbol generation unit (801) adapted to generate a first OFDM symbol (210) and a second OFDM symbol (220); wherein the first (210) and second (220) OFDM symbols comprise mutually exclusive sets of OFDM subcarriers; and a symbol insertion unit (802) adapted to adjoin the first OFDM symbol (210) to first payload data (211) for transmission in the first signal component (810), and adapted to adjoin the second OFDM symbol (220) to second payload data (221) for transmission in the second signal component (820).