Shuna Yang

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In this paper, we propose a novel nonblocking optical packet switch (OPS) architecture, named Input-Concentrator OPS (IC-OPS). In IC-OPS multiple input concentrators are used to aggregate all the incoming traffic into a single arrayed waveguide grating router. Accordingly, the physical size, the number of the needed wavelength converters, and the economic(More)
This paper evaluates the performance of an asynchronous optical packet switch (OPS) equipped with limited range wavelength converters (LRWCs), in terms of packet loss ratio (PLR), when a circular-type wavelength conversion is adopted. Two separate Markov models are proposed to provide the analytical upper and lower bounds values of the PLR. The(More)
—This paper presents two separate Markov models to investigate blocking probabilities in multi-service communications systems, when preemptive scheduling is adopted to implement service differentiation. One is the generalized model, which is built as a multi-dimensional Markov chain, based on a variant of the multi-dimensional Erlang loss model. The other(More)
Optical buffering is one major challenge in realizing all-optical packet switching. In this paper we focus on a delay-line buffer architecture, called a Multiple-Input Single-Output FIFO (MISO-FIFO) optical buffer. This architecture reduces the physical size of a buffer by up to an order of magnitude or more by allowing reuse of its basic optical delay line(More)
In this paper we propose a novel Markov model to evaluate the performance of an asynchronous optical packet switch (OPS) equipped with limited range wavelength converters (LRWCs). The model is used for calculating the packet loss ratio (PLR) as a function of the normalized system load and the conversion range of the LRWC, when a circular wavelength(More)
Optical buffering is one major challenge in realizing all-optical packet switching. In this paper we focus on a delay-line buffer architecture, called a Multiple-Input Single-Output (MISO) buffer, which is realized by cascaded fiber delay lines (FDLs). We consider the MISO buffers in a network scenario where the incoming packets are asynchronous and of(More)
A novel photonic analog-to-digital conversion scheme using Mach-Zehnder modulators (MZMs) with identical half-wave voltages and multiple comparators with improved bit resolution is proposed and demonstrated. Compared with the scheme using MZMs with geometrically scaled half-wave voltages, the proposed scheme has the advantage of using MZMs with identical(More)
In this paper, we propose a novel non-blocking optical packet switch (OPS) architecture, named OPS with input concentrators (OPS-IC). In OPS-IC multiple input concentrators are used to aggregate the incoming traffic into the switch fabric, and the fixed wavelength converters (FWCs) at the switch output are employed to solve the contention resolution.(More)
The delay-line buffer is widely used to solve contention by exploiting the time domain for optical packet switching (OPS) networks. How to optimize the length of the delay-line element to minimize the packet loss is a major challenge in designing delay-line buffers efficiently. In this paper we consider the buffers in asynchronous OPS networks with(More)
This paper investigates packet loss in multi-service Optical Packet Switched (OPS) networks, in which the Preemptive Drop Policy (PDP) is adopted to implement QoS differentiation. A novel approximation model is proposed. In contrast with existing multi-dimensional Markov model, which focuses on analyzing the small system with only two service classes and(More)