A 135km, 8192-Split, Carrier Distributed DWDM-TDMA PON with 2x32x10Gb/s Capacity

We present a hybrid dense wavelength division multiplexed - time division multiple access passive optical network (DWDM-TDMA PON) with record performance in terms of reach (135.1km of which 124km were field-installed fibers), number of supported optical network units (ONUs - 8192) and capacity (symmetric 320Gb/s). This was done using 32, 50GHz spaced downstream wavelengths and another 32, 50GHz spaced upstream wavelengths, each carrying 10Gb/s traffic (256 ONUs per wavelength, upstream operated in burst-mode). The 10Gb/s downstream channels were based upon DFB lasers (arranged in a DWDM grid), whose outputs were modulated using a electroabsorption modulator (EAM). The downstream channels were terminated using avalanche photodiodes in the optical networks units (ONUs). Erbium-doped fiber amplifiers (EDFAs) provided the gain to overcome the large fiber and splitting losses. The 10Gb/s upstream channels were based upon seed carriers (arranged in a DWDM grid) distributed from the service node towards the optical network units (ONUs) located in the user's premises. The ONUs boosted, modulated and reflected these seed carriers back towards the service node using integrated 10Gb/s reflective EAM-SOAs (EAM-semiconductor optical amplifier). This seed carrier distribution scheme offers the advantage that all wavelength referencing is done in the well controlled environment of the service node. The bursty upstream channels were further supported by gain stabilized EDFAs and a 3R 10Gb/s burst-mode receiver with electronic dispersion compensation.