All-optical format conversion from inverse-return-to-zero (inverse-RZ) to non-return-to-zero (NRZ) is realized by using a half-bit-delay Mach-Zehnder delay interferometer. Experimental results demonstrate that the converted NRZ signal has better receiver sensitivity than the back-to-back inverse-RZ signal.
This paper introduces a kind of Adaptive Optical Label Packet Switching (AOLPS) technology. Based on Optical Packet
Switching (OPS), AOLPS uses optical label to achieve self-routing, and the size of optical packet is self-adaptive. At the
edge nodes, IP packets are fist classified into different
first-in-fist-out memories (FIFOs) according to their priority
levels and destinations, and then being encapsulated into optical packets. The traffic at each FIFO is real-time monitored,
and the controller in edge node employs an optimal strategy to generate suitable sized packets for transmission. Large
sized packets will be adopted when traffic is heavy, and small sized packets will be used when traffic is light. This self-adaptive
switching granularity can greatly improve the network performance.
In an asynchronous optical packet switching network, contention occurs at a node whenever two or more packets
are trying to leave the node from the same output port on the same wavelength. As a means of contention
resolution, fiber delay lines (FDLs) are commonly implemented in optical buffers. This paper presents an
analytic model to study single-wavelength FDL buffer systems with finite waiting places. Considering the delay
quantization in FDLs the deference between waiting time and delay time is discussed detailedly and then the
packet lengths are modified. Analytic results of the queuing performance can be figured out for the finite FDL
buffer system. Accuracy of the proposed model is finally validated through numerical simulation.
Using effective port number, effective BHCA and local traffic ratio,
a general equation for calculating capacity of softswitch network is
presented in this paper. Furthermore, two types of network extension
are considered. The first one is extended by <i>m</i> individual systems, and the second one is extended by another network with <i>M</i> interlinked systems. The approaches for network capacity estimation are proposed with respect to such two cases.
A kind of optical coarse packet switching based on optical label routing is intrduced. In the switching, the swapping granularity is coarse compared to common optical packet switching, and the header of optical packet is labeled by multi-wavelengths. Some realization techniques on core switching node and edge node with terminator are studied. A principle experiment system is established to perform the optical coarse packet transmitting, switching, and receiving, and verify the feasibility of such optical coarse packet switching.