Speaker
Mr
George Isoe
(Centre for Broadband Communication,Nelson Mandela Metropolitan University)
Description
Abstract: Current optical access network use on-off keying (OOK) modulation format throughout the network regardless of actual end user demand. We propose the use of two pulse amplitude modulation (2-PAM) and 4-PAM formats to increase the aggregated data rates of optical access networks. In this work, we experimentally evaluate the realization of a high capacity passive optical network using 1310 nm vertical cavity surface emitting lasers (VCSELs) in the OOK, 2-PAM and 4-PAM modulation formats. An 11 km of G.652 standard fibre transmission was experimentally investigated at 10 Gbps, 15 Gbps and 20 Gbps data rates per channel for OOK, 2-PAM and 4-PAM modulation formats respectively. An 11 km fibre transmission introduced a penalty of 0.46 dB and 3.45 dB incurred for the 10 Gbps OOK and 15 Gbps 2-PAM formats. However, for the 20 Gbps 4-PAM format, the maximum reach was limited to 3.21 km due to inter-symbol interference at such a high bit rate. All measurements were done in real time and without any data equalization mechanism. The experimental comparison showed that the OOK format vastly outperforms the 2-PAM and 4-PAM formats in terms of tolerance to transmission penalties. Nevertheless, 4-PAM format is still an effective way to double the data rate in access networks. This study provides vital performance awareness information needed for capacity upgrade in next-generation optical access networks.
Keywords: OOK, Pulse amplitude modulation (PAM), VCSEL, optical access network
Apply to be<br> considered for a student <br> award (Yes / No)?
Yes
Main supervisor (name and email)<br>and his / her institution
Prof. Timothy Gibbon
Tim.Gibbon@nmmu.ac.za
Nelson Mandela Metropolitan University
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?
Yes
Level for award<br> (Hons, MSc, <br> PhD, N/A)?
PhD
Primary author
Mr
George Isoe
(Centre for Broadband Communication,Nelson Mandela Metropolitan University)
Co-authors
Prof.
Andrew Leitch
(NMMU)
Mr
Duncan Boiyo
(Centre for Broadband Communication, Nelson Mandela Metropolitan University)
Dr
Romeo Reginald Gunther Gamatham
(NRF, Square Kilometre Array South Africa)
Mr
Shukree Wassin
(NMMU)
Dr
Timothy Gibbon
(NMMU Physics Department)
