Linewidth enhancement factor in electroabsorption modulated lasers

Niloy Choudhury; Niloy K. Dutta

doi:10.1117/12.371254

26 November 1999 Linewidth enhancement factor in electroabsorption modulated lasers

Niloy Choudhury, Niloy K. Dutta

Proceedings Volume 3847, Optical Devices for Fiber Communication; (1999) https://doi.org/10.1117/12.371254
Event: Photonics East '99, 1999, Boston, MA, United States

Abstract

Semiconductor sources with integrated electroabsorption modulators and distributed feedback lasers (EML) are important for high speed (2.5 Gb/s and higher) transmission systems. These devices have very low spectral width under modulation which reduces the effect of fiber chromatic dispersion. The low spectral width is due to low linewidth enhancement factor ((alpha) -factor) of these devices. We report measurement of (alpha) as a function of bias for different EML devices. For EML devices with large isolation resistance between the laser and the modulator, (alpha) varies with the modulator voltage. For some bias level measured (alpha) is close to zero. The value of (alpha) has also been calculated using the band structure parameter of the active region. The measurement and calculation agree. For EML devices with low isolation resistance, the measured (alpha) is found to be nearly independent of modulator voltage. This is explained by considering the effect of leakage current between the laser and the modulator.

Citation Download Citation

Niloy Choudhury and Niloy K. Dutta "Linewidth enhancement factor in electroabsorption modulated lasers", Proc. SPIE 3847, Optical Devices for Fiber Communication, (26 November 1999); https://doi.org/10.1117/12.371254

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