Investigation of SOA nonlinearities on the amplification of DWDM channels with spectral efficiency up to 2.5 b/s/Hz

We have investigated and compared the effect of semiconductor optical amplifier (SOA) nonlinearities on the amplification of 14 dense wavelength-division-multiplexing channels using return-to-zero on-off keying [(RZ-OOK) 1 b/symbol], RZ differential quadrature phase-shift keying [(DQPSK) 2 b/symbol]...

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Bibliographic Details
Published in:IEEE photonics technology letters 2004-03, Vol.16 (3), p.918-920
Main Authors: Cho, P.S., Achiam, Y., Levy-Yurista, G., Margalit, M., Gross, Y., Khurgin, J.B.
Format: Article
Language:English
Subjects:
Amplification
Channel spacing
Channels
Crosstalk
Degradation
Format
Multiplexing
Nonlinearity
Optical polarization
Phase noise
Phase shift keying
Quadrature phase shift keying
Semiconductor device noise
Semiconductor optical amplifiers
Spectra
Symbols
Wavelength division multiplexing
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Summary:We have investigated and compared the effect of semiconductor optical amplifier (SOA) nonlinearities on the amplification of 14 dense wavelength-division-multiplexing channels using return-to-zero on-off keying [(RZ-OOK) 1 b/symbol], RZ differential quadrature phase-shift keying [(DQPSK) 2 b/symbol], and polarization (bit interleaved) multiplexed RZ-DQPSK (4 b/symbol) formats with aggregate data rates up to 50 Gb/s per channel. The channel spacing was 20 GHz with spectral efficiency from 0.625 up to 2.5 b/s/Hz. Our results have shown that while RZ-OOK format performs better at lower SOA input powers, RZ-DQPSK suffers less degradation from SOA nonlinearities at higher input powers. Overall, polarization-bit-interleaved RZ-DQPSK format was found to have the best tolerance to SOA nonlinearities.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2004.823687