Digital Compensation of SSBI in Direct Detection Multicarrier System With SOA Nonlinearities

We demonstrate an efficient signal-signal beat interference (SSBI) compensation technique for a direct-detection multicarrier optical system for the first time in the presence of nonlinear transfer function introduced by a semiconductor optical amplifier (SOA). While conventional digital SSBI compen...

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Bibliographic Details
Published in:IEEE photonics technology letters 2017-02, Vol.29 (4), p.369-372
Main Authors: Vedala, Govind, Hameed, Mahmood A., Rongqing Hui
Format: Article
Language:English
Subjects:
nonlinear compensation
Nonlinear optics
OFDM
Optical attenuators
optical fiber communications
Optical filters
Optical pumping
Optical receivers
Semiconductor optical amplifiers
SOA
SSBI
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Summary:We demonstrate an efficient signal-signal beat interference (SSBI) compensation technique for a direct-detection multicarrier optical system for the first time in the presence of nonlinear transfer function introduced by a semiconductor optical amplifier (SOA). While conventional digital SSBI compensation takes into account the nonlinear effect of photo-detection due to the square-law characteristic, nonlinear wave mixing among subcarriers can also be introduced by gain saturation if the system transfer function is nonlinear, which reduces the effectiveness of digital SSBI compensation. Using the nonlinear transfer function of SOA as an example, we show that the effectiveness of SSBI compensation can be largely restored when the nonlinearity is properly modeled through digital backpropagation.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2016.2647561