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Extra resources for Advances in Photonics for Information and Communication
Information in FDDI is passed as tokens generated by the main station. Each token moves along the entire ring until a station requires access to the information. When a station wants to transmit or receive anything, it accepts the token, transmits the data in the FDDI frame then returns the token to the network, signalling the end of the transmission. FDDI-2 supports voice and data traffic too. It uses a circuitswitched technology so there is a dedicated physical path for the duration of the data transmission.
Materials and devices WDM uses photonic crystals for multiplexers and add-drop filters in WDM systems. Their light sources are QD lasers and their waveguides are semiconductor waveguides. Two technologies have helped realise large-scale photonic switching: 3D microelectromechanical systems (3D MEMS) and generalised multiprotocol label switching (GMPLS). 3D MEMS offer non-blocking, fast switching, scalability and low crosstalk. They use laser beams for data switching. Protocols SONET SONET is not used much as it has very specific interfaces, provides limited bandwidth and is not flexible enough to satisfy the changing demands of an organisation.
The coarser channel spacing than in DWDM places less exacting requirements on the lasers and there are no special requirements for temperature control and external feedback loops to minimise wavelength drift. ISPs currently use three CWDM systems. Page 38 © Copyright Pira International Ltd 2007 Advances in Photonics for Information and Communication Future outlook and trends in photonics Traditional: 5 signals are accepted at 850, 1,310 and 1,510nm then converted into CWDM signals. The ISP or the vendor is responsible for end-to-end system performance.
Advances in Photonics for Information and Communication by Pira International Ltd