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System for amplifying an optical signal, transmission system with dispersion map, and erbium-doped fiber amplifier (EDFA)
System for amplifying an optical signal, transmission system with dispersion map, and erbium-doped fiber amplifier (EDFA)
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机译:放大光信号的系统,具有色散图的传输系统和掺b光纤放大器(EDFA)
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摘要
A hybrid Raman-EDFA provides gain equalization over the C-band and L-band. The hybrid Raman-EDFA includes a Raman section producing a Raman gain and an EDFA section producing an EDFA gain complimenting the Raman gain. The EDFA section preferably includes a highly inverted, single-stage EDFA to produce the complimenting EDFA gain shape. One embodiment of the EDFA section includes a high return loss termination located after the erbium fiber to receive unabsorbed pump power. Multiple hybrid Raman-EDFAs can be connected in an amplifier chain in a transmission system. The transmission system preferably provides a dispersion map including regular composite fiber spans followed by at least one compensating span of negative dispersion fibers. The Raman sections of the hybrid Raman-EDFAs are preferably coupled to negative dispersion fiber in the transmission system. IMAGE
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