The search functionality is under construction.
The search functionality is under construction.

Channel Allocation and DBA Mechanisms for Improvement of Bandwidth Utilization Performance of ECDM-PON Systems

Yoshihiro NAKAHIRA, Ryuichi WATANABE, Masayuki KASHIMA

  • Full Text Views

    0

  • Cite this

Summary :

This paper describes a novel channel allocation and DBA (Dynamic Bandwidth Allocation) mechanism for ECDM-PON (Electric Code Division Multiplex -- Passive Optical Network) systems. In the current ECDM-PON systems, each ONU (Optical Network Unit) is limited to 2 or 3 CDM channels. This is because (fixed channel) CDM transmitters are expensive, and tunable CDM transmitters even more expensive. With a small number of CDM channels, the bandwidth utilization ratio is restricted by channel blocking. Our proposed mechanisms can reduce the channel blocking ratio without increasing the number of CDM transmitters or using tunable CDM transmitters. To clarify the advantages of the proposed system performance, we have evaluated the channel non-blocking ratio (Rn) and wasted resource ratio (Rw) when some users request bandwidth more than 100%. Evaluation of the non-blocking ratio, Rn shows that the proposed mechanisms approach the performance of a system with tunable CDM transmitters when the number of ONUs with over 100% traffic load is small. We have also simulated throughput for uniform traffic. In addition to these evaluations, we implemented our proposed mechanism on an FPGA (Field Programming Gate Array) and evaluated the calculation speed to allocate timeslots on CDM channels and a timeline.

Publication
IEICE TRANSACTIONS on Communications Vol.E94-B No.2 pp.437-443
Publication Date
2011/02/01
Publicized
Online ISSN
1745-1345
DOI
10.1587/transcom.E94.B.437
Type of Manuscript
PAPER
Category
Fiber-Optic Transmission for Communications

Authors

Keyword