Cost-Effective and Spectrum-Efficient Coherent TDM-OFDM-PON Aided by Blind ICI Suppression

Digital coherent orthogonal frequency division multiplexing passive optical network (OFDM-PON) is a strong candidate for the 2nd-stage-next-generation PON (NG-PON2). However, as an OFDM system, especially for long-symbol duration OFDM system, it is very sensitive to laser phase noise. The common phase error (CPE) and intercarrier interference (ICI) caused by the laser phase noise severely cut down the performance of the coherent OFDM-PON. To correct the phase noise as well as guarantee high spectral efficiency, in this letter, we propose an advanced pseudo pilot-aided orthogonal basis expansion-based (A-PS-OBE) blind ICI suppression method over both constant and nonconstant modulus modulation, and deployed it in coherent optical time division multiplexing (TDM) OFDM-PON. The numerical results demonstrate the A-PS-OBE method can make the application of the cost-effective lasers possible in the coherent TDM-OFDM-PON and high-order modulation can also be adopted though the laser linewidth is large to 700 kHz.