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Photocurrent spectroscopy analysis of widely tunable negative-chirp quantum-well intermixed laser-modulator transmitters

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5 Author(s)
Morrison, C.B. ; Department of Electrical and Computer Engineering, University of California–Santa Barbara, Santa Barbara, California 93106 ; Raring, J.W. ; Skogen, E.J. ; Wang, C.S.
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High-speed laser-modulator transmitters fabricated using InGaAsP quantum-well intermixing exhibit negative chirp over a wavelength range of more than 30 nm. Photocurrent spectroscopy is used to examine the multiple band edges in these devices. An exciton peak is found in the photocurrent data, and the evolution of the band edge as a function of quantum-well intermixing and applied bias voltage is revealed. The photocurrent data are then exploited to verify and explain the negative chirp characteristics of the wavelength-agile transmitters.

Published in:

Applied Physics Letters  (Volume:86 ,  Issue: 7 )

Date of Publication:

Feb 2005

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