We study photonic packet switches to support asynchronously arriving variable-length packets. A scheduler for contention resolution is operated in electrical domain even when data street of the buffer is provided in optical domain. In this scheme, the scheduler may be a bottleneck. To compensate the gap of high-speed optical transmission and slow-speed electronic processing, we propose a multi-...

We present and evaluate a compact, all-optical Clock and Data Recovery (CDR) circuit based on integrated Mach Zehnder interferometric switches. Successful operation for short packet-mode traffic of variable length and phase alignment is demonstrated. The acquired clock signal rises within 2 bits and decays within 15 bits, irrespective of packet length and phase. Error-free operation is demonstr...

Current TCP flow control depends on packet losses to find the workload that a network can support. Packet drops not only reduce TCP performance, but also add large transfer delay to the packets. Instead of dropping the overflowed packets, Explicit Congestion Notification (ECN) detects incipient congestion and notifies the sources to reduce their windows when the queue length exceeds a threshold...

We compare the delays experienced by packet flows when transmitted using different scheduling algorithms across a crossbar switch. The two scheduling algorithms we consider are iterative SLIP [5] and QCSMA [3]. We first compare them under the assumptions that all packets have the same length, and then under the assumption that the half the packets have the maximum allowable length and half have...

Mobile enable Wireless Sensor Network (mWSN) has been proposed to realize large-scale information gathering via networking wireless sensors and mobile sinks. Some fundamental design parameters in mWSN have been investigated in this article, such as cluster size, sink velocity, transmission range, and packet length. Our contributions include: 1) We propose to use multihop forwarding to form a cl...

This paper investigates the effects of shadowing on the optimal transmit power required to sustain the network connectivity while maintaining a predefined maximum tolerable Bit Error Rate (BER) in a Wireless Sensor Networks (WSN). Optimization of transmit power is of great importance in WSN since sensor nodes are battery driven and optimization helps to increase battery life by reducing inter n...

Input Queued(IQ) switches have been very well studied in the recent past. The main problem in the IQ switches concerns scheduling. The main focus of the research has been the £xed length packet-known as cells-case. The scheduling decision becomes relatively easier for cells compared to the variable length packet case as scheduling needs to be done at a regular interval of £xed cell time. In rea...

Wavelength division multiplexing (WDM) switching has been emerging as the dominant technology in optical networks. In this paper, we study the switching performance of WDM optical packet switch (OPS) equipped with tunable wavelength converter sharing dedicated to each output fiber line under self-similar variable packet length traffic. In this study, we model WDM OPS employing tunable wavelengt...

The perform ance and stability of a slotted direct-sequence spread-spectrum multiple-access (DSSSMA) packet radio network employing the type-II hybrid automatic-repeatrequest (ARQ) protocol with ® nite-length transm itter buffers are considered. The equilibrium point analysis (EPA) technique is employed to analyze the system stability and to approxim ately compute the system throughput, delay, ...