Bernard Hl Lee

Performance of All-Optical Multicasting Via Dual-Stage XGM in SOA for Grid Networking

The letter presents a study on the performance of an all-optical multicasting technique utilizing the nonlinearity of semiconductor optical amplifier (SOA) technology for all-optical grid computing network. The technique not only has the capability to optically control the degree of multicasting but also performs all-optical switching simultaneously. Experimental results show the designs capability to multicast an incoming 10-Gb/s optical signal onto 16 outgoing signals using cross-gain modulation in a single SOA. A second SOA is also included in the design as a 2R regenerator

Scalable FTTH-PON architecture for unlimited user and flexible services

This paper introduces a novel FTTH-PON network architecture suitable for unlimited user and service scaling. It employs a passive NxN AWG and exploits the wavelength cyclical routing which is made possible by the devices Free Spectral Range (FSR) property at 2.5Gbps. The proposed architecture is based upon the WDM-PON features unique properties including the possibility of offering simultaneously both broadcast and switches services plus additional advantages in term of signal privacy, easy fault location and direct capacity upgrade and also has the potential of offering a wide variety of services on the same physical network. Although the additional AWG in the network posses an extra 5dB power penalty but an optical transmission test demonstrate an error free transmission has been achieved with a 25km passive optical link with a 16×16 AWG and a 1×32 splitter installed.

Packet router architecture with multicasting capability for future optical networking

This paper introduces a design for a high capacity multicasting capable Optical Packet Switched Router (OPSR). It incorporates an Arrayed Waveguide Grating (AWG) as its core switching matrix to manage the ever increasing packet switched traffic within the optical network. The OPSR has the capability to switch optical packet traffic through the AWG with a switching speed of a few nano-seconds (nsec) at a bit rate of 10Gbps and above with multicasting capability. The capabilities offered by this OPSR will speed up all-optical packet switching and reduce packet latency and consequently packet loss.

Network Performance of Multi-Protocol Optical Switch Routing Algorithm under Multimedia Traffic

This work presents a novel routing protocol based MPOS (B.H.L. Lee et al., 2006), which is used in the construction of the multiprotocol switch for multimedia traffic. The MPOS routing segregates the different types of multimedia traffic into dedicated classes/priorities and assigns a light path for each of them. Experimental results of the MPOS routing optimize cost of the maximum end-to-end delay at high traffic load.

Physical & network performance of the multi- protocol optical switch (MPOS) for all-optical grid networking

This paper presents the physical & network performance of a novel all-optical multi-protocol optical switch (MPOS). The MPOS segregates the different incoming traffics into their individual classes and routing is performed according to their classes. Furthermore, the MPOS also employs the usage of cross gain modulation (XGM) and cross phase modulation (XPM) in SOAs to achieve all-optical routing, multicasting and regeneration at 10 Gbps. Simulation and experimental results show significant improvements on traffic performance versus conventional IP routing and also an error free 1-to-16 multicast and regeneration were achieved as well.

Performance Evaluation of Multimedia Traffic on Multi-Protocol Optical Switch Routing Algorithm

In this paper, authors compared the performance of the MPOS routing algorithm against conventional packet schemes using multimedia traffic. The MPOS routing segregates the different types of multimedia traffic into dedicated classes/priorities and assigns a light path for each of them. Improved network performance has been observed by the MPOS technique at high traffic load.

Performance of 4-channel optical spectral CDMA using fibre Bragg gratings

We present an incoherent optical spectral CDMA (OS-CDMA) multiple-access system that uses in-fibre Bragg gratings for encoding/decoding. The system comprising four channels, one desired and operating at a 2.5Gbps and 10Gbps. Our measurements verify that this technique suffers from severe chromatic dispersion. Nevertheless with appropriate dispersion compensation, the system is able to achieve a span of 100km.

Double-stage all-optical wavelength conversion using XGM and XPM for future all-optical transponder with WDM multicasting capability

This paper presents a study on an all-optical multicasting switching matrix design based on SOA and AWG technology for all optical DWDM network. The technique not only has the capability to control the degree multicasting optically but also perform double stage of wavelength conversion. Experimental results have shown the designs capability to multicast an incoming 10Gbps optical signal onto 16 outgoing signals using Cross Gain Modulation and then using Cross phase modulation as a second stage of conversion to perform 2R (re-amplified and re-shape).

Performance Simulation of Multi Protocol Optical Switch (MPOS) with Multicasting Capability for Optical GRID Networks

This paper presents a novel optical switch, MPOS concept which is capable of not only handling circuit, burst and packet based traffic but also performing all optical multicasting. This switch design is based upon a wavelength routed switching matrix with the used of SOAs as wavelength converters and also to perform multicasting. Optical switches with such capabilities are essential for future optical grid networking. Physical performance of the MPOS at 10 Gbps will be presented in this paper

All optical wavelength conversion technique in DWDM network with study on step and linear shared buffer for packet switching

This paper instigate a design for packet switching using all optical wavelength conversion technique in DWDM network. It integrate an arrayed waveguide grating (AWG) as its core switching matrix to manage packet switch traffic within the optical network with all optical wavelength converter using Cross Phase Modulation SOAs.