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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 27, Iss. 13 — Jul. 1, 2009
  • pp: 2370–2378

Optical Modulator Optimization for Orthogonal Frequency-Division Multiplexing

Daniel J. Fernandes Barros and Joseph M. Kahn

Journal of Lightwave Technology, Vol. 27, Issue 13, pp. 2370-2378 (2009)


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Abstract

Orthogonal frequency-division multiplexing (OFDM) has a high peak-to-average ratio (PAR), which can result in low optical power efficiency when modulated through a Mach–Zehnder (MZ) modulator. In addition, the nonlinear characteristic of the MZ can cause significant distortion on the OFDM signal, leading to in-band intermodulation products between subcarriers. We show that a quadrature MZ with digital predistortion and hard clipping is able to overcome the previous impairments. We consider quantization noise and compute the minimum number of bits required in the digital-to-analog converter (D/A). Finally, we discuss a dual-drive MZ as a simpler alternative for the OFDM modulator, but our results show that it requires a higher oversampling ratio to achieve the same performance as the quadrature MZ.

© 2009 IEEE

Citation
Daniel J. Fernandes Barros and Joseph M. Kahn, "Optical Modulator Optimization for Orthogonal Frequency-Division Multiplexing," J. Lightwave Technol. 27, 2370-2378 (2009)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-27-13-2370

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