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Robustness Improvement of Compact Predistorters in a CO-OFDM System Using Semiconductor Optical Amplifiers

Mohamad Younes 1, 2, 3 Mihai Telescu 1, 2 Noël Tanguy 2, 1 Chérif El Valid Diouf 2, 3 Pascal Morel 2, 4, 3 Stéphane Azou 2, 3, 4
1 Lab-STICC_UBO_MOM_PIM
IBNM - Institut Brestois du Numérique et des Mathématiques, Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance
3 Lab-STICC_ENIB_ MOM_DIM
Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance
Abstract : This paper focuses on digital signal processing techniques compensating the non-linear effects inherent to optical modulation or amplification within a coherent optical orthogonal frequency division multiplexing (CO-OFDM) transmitter featuring a semiconductor optical amplifier (SOA). Two complementary approaches are specifically considered: crest factor reduction and linearization using a digital baseband predistortion. Two possible implementations are presented for the digital predistortion block. One is the basic solution of static compensation; the other consists in a parallel two-box digital polynomial predistorter (PTB) combining, in parallel, a static nonlinear block with a memory polynomial predistorter. Moreover, we show that a linearization of the dynamic behavior of the transmitter, in addition to peak-to-average power ratio (PAPR) reduction, offers better performance. The robustness of the predistorters or of the combined predistorter/PAPR reduction blocks is assessed for various scenarios. Finally, we propose solutions to improve robustness via multipoint identification or switching strategies for predistortion.
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https://hal.univ-brest.fr/hal-01697205
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Mohamad Younes, Mihai Telescu, Noël Tanguy, Chérif El Valid Diouf, Pascal Morel, et al.. Robustness Improvement of Compact Predistorters in a CO-OFDM System Using Semiconductor Optical Amplifiers. 29th International Conference on Microelectronics (ICM), 2017, Dec 2017, Beirut, Lebanon. ⟨10.1109/ICM.2017.8268828⟩. ⟨hal-01697205⟩

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