persans – 1/31/02 fiber optics in communications and computing peter persans physics dept.,...
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Fiber Optics in Communications and Computing
Peter Persans
Physics Dept., SC1C10, persap
Trans-Atlantic Communications - 1866
10 words/min
Trans-Atlantic Communications: 1998
1013 words/min
A prototypical fiber system
Elements of a communications system
• signal source• transceiver (light source + modulator)• multiplexer• optical fiber• amplifier• optical fiber• demultiplexer• transceiver (receiver)• electronics
Limits of the capability of fibers
• mode dispersion• material dispersion• waveguide dispersion
Fundamental limits of fibers: attentuation
Fundamental Limits
• Limit on the amount of power we can put into one end of a fiber (non-linear loss)
• Limits on the separation of two digital bits from one another (dispersion)
• Limits on the loss in a fiber with distance• Limits on the detection of a signal from a background.
Fundamental limits