Colorless optical network unit (ONU) is a very important concept for the wavelength division multiplexing (WDM)
based passive optical networks (PON). We present a novel scheme to construct non-wavelength-selective ONUs in
WDM/OCDMA-PON by making use of the broad spectrum band of superstructure fiber Bragg gratings (SSFBGs). The
experiment results reveal that the spectrum-sliced encoded signals from different wavelength channels can be
successfully decoded with the same SSFBGs, and thus the proposed colorless ONU scheme is proved to be feasible.
A novel centralized light source OCDMA PON without wavelength filters is proposed and experimentally demonstrated.
The OCDMA coded signals and the unmodulated clock pulses are polarization-multiplexed and simultaneously
transmitted in the downlink. Then the received clock pulses at the ONU side are used as the source for the uplink
transmission. The experiment results based on a two-user 2.5 Gb/s OCDMA system show that excellent performance can
be achieved after a 20-km transmission.
A hybrid 1D/2D en/decoding O-CDMA system is proposed to support multiple bit rates. To the best of our knowledge, a
hybrid O-CDMA system with 2.5Gb/s (OC-16) and 155Mb/s (OC-3) transmission along the single mode fiber with
length of 60km is first successfully demonstrated. In this experimental demonstration, phase coded SSFBGs with chip
rate up to 320Gchip/s are applied as 1-dimensional en/decoders in 2.5Gb/s transmission while 2D en/decoders are
applied in 155Mb/s real time video transmission. Error free transmission is achieved in 1D encoded 2.5Gb/s link; while
2D encoded 155Mb/s channel carrying video signal can be transmitted along the same fiber. This proposed hybrid
1D/2D en/decoding O-CDMA system can also be used for O-CDMA PONs to reduce the costs at the ONU side.
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