Real-Time Coherent UDWDM-PON With Dual-Polarization Transceivers in a Field Trial

Abstract

We propose a coherent ultra-dense wavelength-division multiplexing passive optical network (UDWDM-PON) scheme for symmetrical operations between the uplink and downlink. Then we experimentally demonstrate a field trial of coherent UDWDM-PON using real-time field programmable gate array (FPGA)-based transceivers. The optical distribution network power budget of this system is evaluated based on 40 downlink UDWDM channels with 5 GHz channel spacing in the C band. After transmission over a 40 km field-installed fiber link, the experimental demonstration can achieve power budgets of 29 dB with dual-polarization quadrature phase-shift keying formats at 10 Gb/s for each user. Twenty-four hour real-time performance testing for the field-trial transmission is also conducted to evaluate the feasibility of the real-time FPGA-based transceivers in the proposed UDWDM-PON scheme. Several parameters that may affect system performance are also investigated in the experimental demonstration.