We propose an advanced algorithm to achieve coordinated CMTS-side energy-saving in a HFC network supporting
DOCSIS 3.0 standard. Based on traffic information, the algorithm grooms as many as cable modems (CMs) on a
minimal number of CMTS ports as possible, and put the rest of its ports to sleep for energy-saving. With network
simulations using a realistic CM traffic model, we demonstrate over 31.5% saving on the ON-time for CMTS ports.
We also investigate the tradeoff between the energy-saving and the number of CM change operations, and the
results show that the algorithm can control the number of CM changes with a preset readjustment threshold.
We propose network design algorithms to minimize the power consumption of a translucent optical network with
joined optimization of mixed regenerator placement and wavelength assignment. The performance of the algorithms
is investigated with simulations in ring and grid network topologies. Simulation results indicate that the algorithms
can effectively reduce the number of O/E/O 3R regenerators, leading to less power consumption on signal
regeneration and green network design. Among the algorithms, the maximum segment length wavelength assignment(MSL-WA) approach further reduces regenerator numbers, with the cost of placement readjustments.
We investigate a clock enhancement technique using semiconductor optical amplifier based Mach-Zehnder
interferometer (SOA-MZI) for all-optical clock recovery with numerical simulations. The simulations determine the
optimal operation points of the SOA-MZI for return-to-zero (RZ) and non-return-to-zero (NRZ) inputs, achieving
effective clock performance improvement.
We report an in-depth investigation of the inter-modulation crosstalk in subcarrier multiplexed (SCM) systems with
optical demultiplexing (ODeMux). Both theoretical derivations and numerical simulations show that the crosstalk in
ODeMux systems mainly comes from the nonlinear mixing of the baseband and subcarrier modulations inside the signal
channels. Several key parameters are then studied to estimate their effects on the magnitude of the crosstalk. As a result,
performance optimization strategies are proposed for ODeMux SCM systems.