Enhancement of the harmonic performance of a semiconductor optical amplifier using bias current feedback

Julie A. Constable; Ian H. White; Alastair N. Coles; David G. Cunningham

doi:10.1117/12.146925

16 June 1993 Enhancement of the harmonic performance of a semiconductor optical amplifier using bias current feedback

Julie A. Constable, Ian H. White, Alastair N. Coles, David G. Cunningham

Proceedings Volume 1850, Laser Diode Technology and Applications V; (1993) https://doi.org/10.1117/12.146925
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

A method of reducing the level of harmonic distortion introduced into an analogue amplitude modulated optical signal by a semiconductor optical amplifier is demonstrated experimentally. During preliminary experiments using a bias current feedback loop, an improvement of 3.5 dB is obtained in second harmonic distortion for a multimode optical input. The output noise power is lowered by 3 - 4 dB. A reduction in distortion of 17.75 dB, achieved using direct modulation of the bias current, indicates that better distortion results could be obtained from the feedback method if a higher level of electrical amplification were used. No gain enhancement is measured using the feedback method, but direct modulation of the bias current results in an increase of up to 2.8 dB in device gain.

Citation Download Citation

Julie A. Constable, Ian H. White, Alastair N. Coles, and David G. Cunningham "Enhancement of the harmonic performance of a semiconductor optical amplifier using bias current feedback", Proc. SPIE 1850, Laser Diode Technology and Applications V, (16 June 1993); https://doi.org/10.1117/12.146925

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