A carrier phase recovery method for optical transmission format of 16-QAM constellations is presented. The method can
also be used in coherent optical single carrier or OFDM (CO-OFDM) system to implement blind phase recovery with
low computational cost. We apply this method in 112Gb/s 1040 km CO-OFDM transmission, and compare its
performance to those using the fourth-power estimator. Experimental results obtained indicate that the proposed method
significantly outperform the fourth-power estimator.
An improved token bucket algorithm (Improved TB) is introduced for the Dynamic Bandwidth Allocation (DBA) in an
Ethernet Passive Optical Network (EPON). The scheme is simple and of low computational complexity, it can guarantee
both the efficiency and fairness of the DBA. Simulation results using synthetic traffic confirm its good performance
against existing bandwidth allocation scheme.
A Fairness Guaranteed Scheme is introduced for the Dynamic Bandwidth Allocation (DBA) in an Ethernet Passive Optical
Network (EPON). The scheme is simple and of low computational complexity, it can guarantee both the efficiency and
fairness of the DBA. Especially, it can be used in both inter-ONU scheduling and intra-ONU scheduling. Simulation results
using synthetic traffic confirm its good performance against existing bandwidth allocation scheme.
With the development of Internet application, user needs more and more bandwidth. 10G EPON is a good choice for
next generation access-network. The architecture of the WDM-based 10G EPON is proposed in this paper and we also
provide the configuration of the upstream. WDM-based 10G EPON operate in different speed on different direction, and
the logical link is point to point communication in the upstream while behaving as multipoint to point in physical topology. We put forward the protocol stack of this architecture. We proposed a sub-layer named MWMC (Multi-Wavelengths MAC Control). The MWMC sub-layer need not deal with Timing, Ranging, Report or Gating processing.
But LLID (Logical Link Identifier) is also needed to implement the P2PE (Point to Point Emulation) in the downstream.
We detailed dissertate how to implement the P2PE in this architecture using the concept of LLID. The WDM-based 10G
EPON is easy to implement and need not high speed burst mode transceivers, and its cost is not very high. The WDM-based
10G EPON has better performance than the TDMA-based 10G EPON for its low delay and high upload bandwidth
with no collision between different ONUs in the upstream.