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Amplifier-induced crosstalk in multichannel coherent lightwave systems

Amplifier-induced crosstalk in multichannel coherent lightwave systems

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© The Institution of Electrical Engineers
Published

When an in line semiconductor laser amplifier is used to amplify several channels simultaneously, it can induce inter channel crosstalk if the amplifier gain is channel-dependent. It is shown that modulation of the carrier density at the beat frequency of two neighbouring channels can lead to considerable crosstalk even when the amplifier is operated well below the saturation level. An analytic expression for the channel gains of a travelling-wave amplifier is used to discuss and compare the crosstalk for ASK and FSK systems. The relatively short carrier lifetime in high-gain amplifiers may ultimately limit the channel spacing of such multichannel systems.

Inspec keywords: crosstalk; optical communication equipment; frequency shift keying; amplitude modulation; semiconductor junction lasers

Other keywords: in-line semiconductor laser amplifier; analytic expression; carrier density modulation; laser amplifier induced crosstalk; channel spacing; inter-channel crosstalk; multichannel systems; FSK systems; ASK systems; short carrier lifetime; beat frequency of two neighbouring channels; travelling-wave amplifier; high-gain amplifiers; multichannel coherent lightwave systems

Subjects: Optical communication devices, equipment and systems; Lasing action in semiconductors; Optical communication; Design of specific laser systems; Semiconductor lasers

References

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      • G.P. Agrawal . Four-wave mixing and phase conjugation in semiconductor laser media. Opt. Lett. , 260 - 262
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      • N.A. Olsson . ASK heterodyne receiver sensitivity measurements with two in line 1.5 μm optical amplifiers. Electron. Lett. , 1085 - 1087
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      • I.W. Marshall , M.J. O'Mahony , P.D. Constantine . Optical system with two packaged 1.5 μm semiconductor laser amplifier repeaters. Electron. Lett. , 253 - 255
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      • G. Grosskopf , R. Ludwig , H.G. Weber . Crosstalk in optical amplifiers for two-channel transmission. Electron. Lett. , 900 - 902
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      • Eisenstein, G., Hall, K.L., Jopson, R.M., Raybon, G., Whalen, M.S.: `Two-color gain saturation in an InGaAsP near-traveling-wave optical amplifier', Paper ThC4, OFC/IOOC '87, 1987.
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