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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 26, Iss. 7 — Apr. 1, 2008
  • pp: 807–815

Improving the Performance of Sampled-Grating DBR Laser-Based Analog Optical Transmitters

Leif A. Johansson, Yuliya A. Akulova, Chris Coldren, and Larry A. Coldren

Journal of Lightwave Technology, Vol. 26, Issue 7, pp. 807-815 (2008)


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Abstract

In this paper, the available analog link performance of integrated transmitters containing a sampled-grating distributed Bragg reflector laser, a semiconductor optical amplifier, and a modulator is evaluated. It is found that to provide a link gain and a low-noise figure, an RF preamplifier is required, and for this reason, spurious-free dynamic range (SFDR) including a preamplifier has been evaluated. An SFDR of 110-dBHz2/3, a noise figure of 5.4 dB, and link gain of 6.9 dB at 5 GHz is obtained. It is further investigated how link SFDR can be improved by linearization techniques. Two novel approaches are proposed and demonstrated: first, predistortion by extraction of nonlinear components from an integrated second modulator exposed to the same wavelength, optical power and temperature for matched nonlinear terms; second, a novel linearized modulator configuration balancing electroabsorption and Mach–Zehnder modulation that can reach a null for both second- and third-order intermodulation products at a single bias point.

© 2008 IEEE

Citation
Leif A. Johansson, Yuliya A. Akulova, Chris Coldren, and Larry A. Coldren, "Improving the Performance of Sampled-Grating DBR Laser-Based Analog Optical Transmitters," J. Lightwave Technol. 26, 807-815 (2008)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-26-7-807

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