Abstract
We report on a hybrid DWDM-TDMA optical access network that provides a route for
integrating access and metro networks into a single all-optical system. The greatest
challenge in using DWDM in optical access networks is to precisely align the wavelength
of the customer transmitter (Tx) with a DWDM wavelength grid at low cost. Here, this was
achieved using novel tunable, external cavity lasers in the optical network units (ONUs)
at the customer's end. To further support the upstream link, a 10 Gb/s burst mode
receiver (BMRx) was developed and gain-stabilized erbium-doped fiber amplifiers (EDFAs)
were used in the network experiments. The experimental results show that 10 Gb/s bit
rates can be achieved both in the downstream and upstream (operated in burst mode)
direction over a reach of 100 km. Up to 32 × 50 GHz spaced downstream
wavelengths and another 32 × 50 GHz spaced upstream wavelengths can be
supported. A 512 split per wavelength was achieved: the network is then capable of
distributing a symmetric 320 Gb/s capacity to 16384 customers. The proposed architecture
is a potential candidate for future optical access networks. Indeed it spreads the cost
of the network equipment over a very large customer base, allows for node consolidation
and integration of metro and optical access networks into an all-optical
system.
© 2011 IEEE
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