Robustness analysis of a parallel two-box digital polynomial predistorter for an SOA-based CO-OFDM system

Cherif Diouf (1, 2) , Mohamad Younes (1, 3, 2) , Alexandru Noaja (4) , Stéphane Azou (1, 2) , Mihai Telescu (3) , Pascal Morel (1, 2) , Noël Tanguy (1, 3)

1 Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance
2 Lab-STICC_ENIB_MOM_DIM
3 Lab-STICC_UBO_MOM_PIM
4 MTA - ATM - Military Technical Academy - Académie Technique Militaire [Bucharest, Romania]

The linearization performance of various digital baseband pre-distortion schemes is evaluated in this paper for a coherent optical OFDM (CO-OFDM) transmitter employing a semiconductor optical amplif er (SOA). In particular, the benef ts of using a parallel two-box (PTB) behavioral model, combining a static nonlinear function with a memory polynomial (MP) model, is investigated for mitigating the system nonlinearities and compared to the memoryless and MP models. Moreover, the robustness of the predistorters under different operating conditions and system uncertainties is assessed based on a precise SOA physical model. The PTB scheme proves to be the most effective linearization technique for the considered setup, with an excellent performance-complexity tradeoff over a wide range of conditions.

Mots clés: Coherent Optical OFDM; Semiconductor optical amplif er (SOA); Digital Predistortion; Linearization; PAPR reduction; Robustness analysis

Domaines: Traitement du signal et de l'image [eess.SP]; Optique / photonique

Cherif Diouf, Mohamad Younes, Alexandru Noaja, Stéphane Azou, Mihai Telescu, et al.. Robustness analysis of a parallel two-box digital polynomial predistorter for an SOA-based CO-OFDM system. Optics Communications, 2017, 402, pp.442 - 452. ⟨10.1016/j.optcom.2017.06.023⟩. ⟨hal-01563827⟩