• Increase transmission speed over fiber-optical links using OFDM
• Analysis of impact of linear and nonlinear optical effects on OFDM

• Analysis of bit and power loading for direct detection with frequency fading equivalent channel
• Single Carrier Frequency Domain Equalization for direct detection

The technological progress in the area of communication networks is driven by the still increasing demand for transmission capacity and the necessity for flexible, robust and cost efficient solutions. Communication technology can make important contributions by means of innovative conceps that were introduced into optical communications recently. Among those are modern techniques  in the domain of modulation schemes, channel coding and equalization. The next step in commercial transmission systems is expected to be the introduction of an ethernet standard with a bitrate of 100 Gb/s. This makes high demands on the digital signal processing (DSP) which can be relieved by parallelization.

The application of multi-carrier techniques supports this approach. Multi-carrier techniques such as OFDM (Orthogonal Frequency Division Multiplex) and DMT (Discrete Multitone) are already successfully applied in wireless and DSL (Digital Subscriber Line) systems. To optical communications, this technique is new and not yet studied and tested thoroughly. Here, the possibility of e.g. simple equalization with moderate implementation complexity using electrical signal processing is very promising.

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