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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 24, Iss. 10 — Oct. 1, 2006
  • pp: 3835–3841

The Effect of Signal-Feeder Characteristic Impedance on the Signal Injection Efficiency of Electroabsorption Modulator Integrated Lasers

Cheng Guan Lim

Journal of Lightwave Technology, Vol. 24, Issue 10, pp. 3835-3841 (2006)

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The signal injection efficiency of electroabsorption modulator integrated lasers (EMLs) is improved to suit 10-Gb/s applications. For a typical EML module design with a conventionally designed 50-Ω signal feeder to meet the input return loss requirement for 10-Gb/s applications, a reduction in device capacitance of the electroabsorption modulator (EAM) section by 65% from its typical value is necessary. By optimizing the characteristic impedance of the signal feeder, the required 65% reduction in device capacitance of the EAM section is reduced to 45%, which would naturally lead to enhanced extinction ratio and optical output power. With the addition of a series 5-Ω thin-film resistor along the signal feeder, the device capacitance reduction of the EAM section is further reduced to approximately 33% of the typical value.

© 2006 IEEE

Cheng Guan Lim, "The Effect of Signal-Feeder Characteristic Impedance on the Signal Injection Efficiency of Electroabsorption Modulator Integrated Lasers," J. Lightwave Technol. 24, 3835-3841 (2006)

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