Abstract
We demonstrate an improved overlapped-subcarrier multiplexed (O-SCM) WDM PON architecture transmitting over a single feeder using cost sensitive intensity modulation/direct detection transceivers, data re-modulation and simple electronics. Incorporating electronic equalization and Reed-Solomon forward-error correction codes helps to overcome the bandwidth limitation of a remotely seeded reflective semiconductor optical amplifier (RSOA)-based ONU transmitter. The O-SCM architecture yields greater spectral efficiency and higher bit rates than many other SCM techniques while maintaining resilience to upstream impairments. We demonstrate full-duplex 5 Gb/s transmission over 20 km and analyze BER performance as a function of transmitted and received power. The architecture provides flexibility to network operators by relaxing common design constraints and enabling full-duplex operation at BER ∼ 10(-10) over a wide range of OLT launch powers from 3.5 to 8 dBm.
Highlights
The demand for Internet bandwidth is growing at an unprecedented rate, with global IP traffic expected to increase fourfold between 2010 and 2015 [1]
In this paper we demonstrate an improved overlapped-subcarrier multiplexed (O-subcarrier multiplexing (SCM)) architecture where the downlink is placed on a radio frequency (RF) subcarrier and the uplink transmitted at baseband
At the optical network units (ONUs), a coupler tapped off 40% of the downstream signal to the receiver composed of a commercial p-i-n photoreceiver and RF down-conversion circuit
Summary
The demand for Internet bandwidth is growing at an unprecedented rate, with global IP traffic expected to increase fourfold between 2010 and 2015 [1]. A number of techniques have proven successful at further increasing the transmission bit rate, such as the use of higher order modulation formats, delay interferometers, narrow optical filters, device structure and packaging optimization, integrated modulators, and electronic equalization [6,7,8,9,10,11,12,13]. Employing some of these techniques has enabled the direct modulation of a RSOA at 25.78 Gb/s [12]. The minimum launch power to achieve full-duplex operation was 3.5 dBm, which to the best of our knowledge is one of the lowest reported for SCM systems operating at this bit rate
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