Abstract
We propose a novel line coding combination (Inverse RZ coding in downlink and RZ in uplink) that extends the reach of WDM Passive Optical Networks based on Reflective SOAs with no in-line amplification. We achieved full downstream remodulation even when feeding the reflective SOA with power levels as low as -35 dBm, thus increasing the system power budget. We experimentally assessed this scheme for a fully passive, full-duplex and symmetrical 1.25 Gb/s WDM-PON over a 80 km G.652 feeder.
Highlights
Network operators are currently looking for valid solutions to deploy long reach Passive Optical Networks (PON) which allow to by-pass the so called Central Offices (COs)
We propose a novel line coding combination (Inverse RZ coding in downlink and RZ in uplink) that extends the reach of WDM Passive Optical Networks based on Reflective SOAs with no in-line amplification
The use of Inverse RZ (IRZ)/RZ may be implemented to allow for longer reaches and/or to implement hybrid WDM-Time Division Multiplexed Access (TDMA) Passive Optical Networks (PON) on selected wavelengths, providing an high degree of flexibility in design and deployment of generation Wavelength Division Multiplexed PON (WDM-PON)
Summary
Network operators are currently looking for valid solutions to deploy long reach Passive Optical Networks (PON) which allow to by-pass the so called Central Offices (COs). By using 50% IRZ in downstream and RZ coding in upstream signal we achieve symmetrical bandwidth, and operate the R-SOAs far from the saturation regime, relaxing the constraints on the ONU’s received power. Using this technique we obtained remodulation with full downstream erasure by seeding a R-SOA with power levels as low as −35 dBm average power over an extended reach of 80 km, with no in-line amplification.
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