2 and a photograph of the optical bench is in Fig. The experimental setup diagram is displayed in Fig.
The detection circuit response time is 40 ns the header reading time is 0.45 µs and the AOS switching time is 90 ns, but its driving time is >1.2 µs, leading to an effective total (input-output) node switching time of ~2.2 µs. A fibre delay line is included just for the optical packet to wait for header detection and processing, before optical switch activation. Optical packets of short duration have typically a time-length of 2.5 µs (and 500By of payload Gb/s) optical bursts can be as long as 100 µs, or even longer. There are golden rules which block the switch while a packet/burst is passing through, so that no packets/bursts are cut or lost. When the optical packet is dropped, it is delivered to an optical receiver and an electronic buffer, before exiting the network node. A preferred output port is selected if available if not it is deflected to the other port. Out 1 Out 2 Local User Add f i, f j, f n X f i, f j X The logic of operation is: At node arrival the header identifies whether the packet is dropped at that node or follows to the next. f i, f j, f In 1 k X f i, f k, f j X Node k Optical Switch In 2 2x2 Drop Header Recognition Decisions & Actions Fig. It is a distributed control because each optical packet or optical burst is locally routed at each node. The overall configuration is 2x2 (two inputs, two outputs) with add-drop ports, without optical buffering. OPS/OBS Distributed Control Node The OPS/OBS node using an acousto-optic (AO) optical switch is presented in Fig. In this work we will present two applications of optical switches in OPS and OBS network nodes. Especially attractive applications of photonic switching are the optical networks that use optical packet and optical burst switching (OPS & OBS) because all the transport path from end-to-end is performed optically. PHOTONIC SWITCHING Photonic switching is defined as the process of switching and routing optical signals without OE conversions. In the present work we will focus on the development and application of optical switches based on acousto-optic and semiconductor optical amplifiers (SOAs). Various technologies may apply, such as acousto-optic, thermo-optic, micro-mechanical, and semiconductor amplifier. This is done without recurring to opto-electronic (OE) conversions and electronic processing of data being transported, thus allowing for much faster and effective end-to-end transmission.
INTRODUCTION Optical switches are a fundamental component in Advanced Photonic Communications because they allow the switching and routing functions to be performed at the optical layer level. Detailed operation and other applications are also considered. The other, a practical application for a centralized control situation is also presented, involving SOA devices, which have better performance and faster switching, with overall switching times of less than 200ns. One, a fully operational optical packet/burst switching (OPS/OBS) distributed control optical node is presented, using AO switches, with complete input-to-output switching time of ~2µs, independent of packet/burst length. Albert Einstein 400, Campinas SP, 13083-970, Brazil Moschim, ABSTRACT In this work we present optical switches based on acousto-optical (AO) and semiconductor amplifier (SOA) devices, implemented in photonic switching optical nodes. Rudge Barbosa and Edson Moschim Laboratório de Tecnologia Fotônica - LTF, FEEC- Unicamp, Av. Optical Switches for Advanced Photonic Networks F.
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