WP2

Objectives

The objective of this WP is to investigate and optimize O/E-modules for high-speed transmission with POF and to demonstrate high-speed applications in edge networks like Gbit-Ethernet and DVB-C and DVB-S, i.e., POF systems at Gbit/s bit rates and distances in the 100 meter range.

Description of work

For high-speed transmission with POF neither active components nor fibers were available in the past that have the potential of low cost and broad acceptance in edge networks. At present, large-core fibers are available, that have the potential of transmitting high data rates up to 3 Gbit/s over 50 m and are most probably available at a low price.
What is still lacking is the availability of high speed laser diodes and transmitter modules and of large area photo diodes and receiver modules. This is intended to overcome in WP3, where commercially available laser diodes shall be characterized, packaged and modeled as naked die and also new concepts of photo diodes are investigated.
In this work package, the results of WP3 and partly WP4 shall be utilized to build up transmitter and receiver modules that make use of the new features of the components and to perform transmission experiments for various applications. On the transmitter side, the laser diode model from WP3 and the fiber characteristics of high speed fibers investigated in WP4 shall be used for the design of an optimized transmitter circuit. Theoretical analysis of the transmitter performance with POF will lead to a an optimized driver circuit that includes impedance matching of the laser diode as well preemphasis circuits to compensate for the modal dispersion in the POF. The transmitter will be realized on PCB and characterized extensively.
On the receiver side various photo diodes are available including a new differential photodiode from WP3. For each photo diode the possibilities for performance optimization regarding power budget, bandwidth and noise shall be evaluated. Taking into account aspects of packaging with and without light concentrators and several amplifier concepts as well as system aspects the receiver performance will be optimized. Several types of receivers will be realized on PCB and characterized.
With fast transmitters and receivers available, transmission experiments and BER measurements in edge networks will be performed up to 3 Gbit/s or 2.5 GHz. Especially the transmission of Gigabit-Ethernet and Digital Video Broadcasting (DVB-C and DVB-S) will be investigated extensively.
This WP will be led by FHG that will also do transmitter design, POFAC will do the receiver design. This work will be based on the investigations on components from WP3 and the results on fiber measurements in WP4. The transmission experiments will be performed jointly by FHG and POFAC.

POF-ALL Project
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Last change: 28/07/2008 09.48.55