Noise suppression using optimum filtering of OCs generated by a multiport encoder/decoder

We propose a novel receiver configuration using an extreme narrow band-optical band pass filter (ENB-OBPF) to reduce the multiple access interference (MAI) and beat noises in an optical code division multiplexing (OCDM) transmission. We numerically and experimentally demonstrate an enhancement of the code detectability, that allows us to increase the number of users in a passive optical network (PON) from 4 to 8 without any forward error correction (FEC)

One-way reservation scheme using optical code processing for fast data transfer

Abstract OBS (Optical Burst Switching), in which wavelengths are reserved on a demand basis is one way to effectively use WDM networks. To reduce overhead time, high-speed processing of the signaling message at each hop is imperative. However, conventional electronic processing is not fast enough and will eventually become a bottleneck as the bit rate of data links increase. To reduce the overhead time in OBS networks, we propose an OC-TAG (Optical Code based Tell-And-Go) protocol for transmitting variable length burst without buffering, and fast burst transfers over WDM networks. Optical-code-based processing is introduced for handling the out-of-band control packets. Through computer simulation, we show the effect of introducing our protocol

Packet Scheduling for WDM Fiber Delay Line Buffers in Photonic Packet Switches

In this paper, we comparatively evaluate two photonic packet switch architectures with WDM-FDL buffers for synchronized variable length packets. The first one is an output buffer type switch, which stores packets in the FDL buffer attached to each output port. Another is a shared buffer type switch, which stores packets in the shared FDL buffer. The performance of a switch is greatly influenced by its architecture and the packet scheduling algorithm. We compare the performance of these two packet switches by applying different packet scheduling algorithms. Through simulation experiments, we show that each architecture has a parameter region for achieving a better performance. For the shared buffer type switch, we found that void space introduces unacceptable performance degradation when the traffic load is high. Accordingly, we propose a void space reduction method. Our simulation results show that our proposed method enables to the shared buffer type switch to outperform the output buffer type switch even under high traffic load conditions