Multi-channel optical fiber communication system
AssigneeLucent Technologies Inc.
InventorsAndrew R. Chraplyvy, Fabrizio Forghieri, Robert William Tkach
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Abstract
A significant part of signal-to-noise degradation in WDM optical fiber communications, due to Raman crosstalk, is found to be deterministic in nature. Shaping of amplifier output to offset depletion of high frequency channels improves signal capacity by an order of magnitude.
Claims12
Wavelength division multiplex optical waveguide system including a transmitter for introducing a set of modulated WDM channels of carrier wavelengths together defining a "WDM spectrum" at a system wavelength, a receiver, and an optical fiber transmission line connecting the transmitter and the receiver, the line including at least one span
- CHARACTERIZED IN THAT
- the product of the number of channels, per-channel bit-rate, and span length is at least 320,000 km-Gb/sec, and in that the system includes, at at least one position in the span, means for shaping the WDM spectrum to result in decreased power level for a long wavelength channel relative to a short wavelength channel of the set, whereby SRS degradation is reduced, to enable operation satisfying the said product.
Dependencies are inferred from the claim text.