Abstract
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 (135.1 km of which 124 km were field-installed
fibers), number of supported optical network units (ONUs—8192) and
capacity (symmetric 320 Gb/s). This was done using 32-, 50-GHz-spaced
downstream wavelengths and another 32-, 50-GHz-spaced upstream wavelengths,
each carrying 10 Gb/s traffic (256 ONUs per wavelength, upstream operated in
burst mode). The 10 Gb/s downstream channels were based upon DFB lasers
(arranged in a DWDM grid), whose outputs were modulated using a
electro-absorption 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 10 Gb/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 toward the service node using integrated 10 Gb/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 10 Gb/s
burst-mode receiver with electronic dispersion compensation. The
demonstrated network concept allows integration of metro and optical access
networks into a single all-optical system, which has potential for capital
and operational expenditure savings for operators.
© 2010 IEEE
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