Compensating the nonlinearity of laser diode in optical wireless transmission using OFDM

Authors:
Haleh Karkhaneh;S. Mohammad Hassan Javadzadeh;Abubakar Sadiq Hussaini;Ayaz Ghorbani;Jonathan Rodriguez
Affiliations:
Amirkabir University of Tech., Dept. of Electrical Eng., Tehran, Iran;Sharif University of Tech., Dept of Electrical Eng., Tehran, Iran;Instituto de Telecomunicações, Aveiro, Portugal;Amirkabir University of Tech., Dept. of Electrical Eng., Tehran, Iran;Instituto de Telecomunicações, Aveiro, Portugal
Venue:
DNCOCO'10 Proceedings of the 9th WSEAS international conference on Data networks, communications, computers
Year:
2010

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Abstract

The nonlinear characteristic of an laser diode, LD, impacts on the performance of optical wireless systems using OFDM (orthogonal frequency division multiplexing). First, the influence of the nonlinear characteristic on bit-error performance is analyzed using a high power LD (LML-808.7B-XX). Next, the paper proposes a predistorter to compensate the nonlinearities. Finally, the coherent optical OFDM (CO-OFDM) system is considered and the performance without linearization and after linearization is analyzed via simulations in an AWGN (additive white Gaussian noise) environment. It is shown that LD nonlinearity can significantly degrade the performance. However, it is demonstrated that this degradation can greatly be mitigated by using the proposed predistortion technique.