Fundamental Limits of Electronic Signal Processing in Direct-Detection Optical Communications (original) (raw)
2000, Journal of Lightwave Technology
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The power of all the channels combined is boosted by an optical amplifier before being launched into an optical fiber. The launched power generally compensates for the fiber transmission loss of a given fiber stage (span). After each span, the signals are amplified by an optical line amplifier (e.g., Erbium doped fiber amplifier), or by a repeater. Since the transmission fiber is a dispersive medium, implying that pulses spread as they travel through the fiber, some form of dispersion compensation is applied at each repeater stage. At the receiving end of the link, the WDM optical signal is de-multiplexed. Each channel is optically pre-amplified and then detected by an optical-to-electrical (O/E) converter (e.g., a photodiode). A decision circuit identifies the “1’s” and “0’s” in the signal. An optical filter can be inserted before the O/E converter to filter out amplifier noise.
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