Broadband Raman pre-amplifier for wavelength division multiplexed optical communication systems
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United States of America Patent
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Nov 21, 2000
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N/A
app pub date -
Oct 5, 1998
filing date -
Oct 5, 1998
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Abstract
An optical WDM transmission system. The arrangement includes a splitter for dividing a multiplexed optical signal having a prescribed bandwidth into a plurality of distinct sub-bands. The plurality of distinct sub-bands is received by a plurality of output paths, respectively, which direct the sub-bands to respective ones of a plurality of optical amplifiers disposed in the output paths. The optical amplifiers each have a prescribed gain shape across the bandwidth of its respective sub-band. A coupler recombines the distinct sub-bands and couples them onto the optical fiber transmission path. An optical preamplifier is coupled to an input of the splitter. The optical preamplifier is a Raman amplifier having a bandwidth substantially encompassing the prescribed bandwidth of the multiplexed optical signal.
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