Title :
Traffic Performance of an Access Hybrid WDM/TDM PON with Colorless Reflective-ONUs under Different Distances OLT-ONUs
Author :
Segarra, Josep ; Sales, Vicent ; Prat, Josep
Author_Institution :
Univ. Polytech. de Catalunya, Barcelona
Abstract :
To reduce costs and cumbersome laser provisioning at the Optical Network Unit (ONU) user level in an access Passive Optical Network (PON), the use of a Reflective-ONU (R-ONU) is a good choice for up-data transmission. An optical carrier is sent by the Optical Line Terminal (OLT) at the Central Office, and a device at the ONU modulates the carrier with the upstream data. This allows all ONUs to be equal and colorless, without a light source in a Hybrid WDM/TDM architecture. The Dynamic Bandwidth Allocation (DBA) is placed at the OLT, where lasers and photodetectors are shared by all R-ONUs. The OLT laser and photodetector employed in an up-data transmission must be tuned for each ONU and a particular Round Trip Time (RTT) set, which is twice the propagation time from OLT to ONU. When an R-ONU is served by a laser, the photodetector must also be available after the RTT to demodulate the up-data. We investigate the importance of the impact of large different distances OLT-ONUs in the traffic characteristics under a DBA with a proposed novel nesting algorithm and Quality of Service (QoS).
Keywords :
bandwidth allocation; lasers; optical fibre networks; photodetectors; protocols; quality of service; telecommunication traffic; time division multiplexing; wavelength division multiplexing; OLT laser; access hybrid WDM/TDM PON; access passive optical network; colorless reflective-ONU; dynamic bandwidth allocation protocol; nesting algorithm; optical carrier; optical line terminal; optical network unit; photodetector; quality of service; time division multiplexing; traffic performance; up-data transmission; Laser tuning; Optical devices; Optical modulation; Optical network units; Passive optical networks; Photodetectors; Quality of service; Telecommunication traffic; Time division multiplexing; Wavelength division multiplexing; Dynamic Bandwidth Allocation (DBA); Hybrid WDM/TDM (Wavelength/Time Division Multiplexing); Passive Optical Network (PON); Quality of Service (QoS); Round Trip Time (RTT);
Conference_Titel :
Transparent Optical Networks, 2007. ICTON '07. 9th International Conference on
Conference_Location :
Rome
Print_ISBN :
1-4244-1249-8
Electronic_ISBN :
1-4244-1249-8
DOI :
10.1109/ICTON.2007.4296089