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Very-low-driving-voltage electroabsorption modulators operating at 40 Gb/s

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4 Author(s)
Fukano, H. ; NTT Photonics Labs., Kanagawa, Japan ; Yamanaka, T. ; Tamura, M. ; Kondo, Y.

This paper has demonstrated a 40-Gb/s low-driving-voltage electroabsorption modulator (EAM) having InGaAlAs/InAlAs multiquantum-well active core. A narrow core buried with polyimide provides a strong optical and electrical confinement, resulting in a maintained large extinction ratio (ER) and an increased 3-dB down frequency. The fabricated EAM shows a 3-dB down frequency as large as 46 GHz, even for the active-core length as long as 200 μm. The EAM operates at 40 Gb/s with an RF ER of 10.5 dB at a driving voltage as low as 0.79 V.

Published in:

Lightwave Technology, Journal of  (Volume:24 ,  Issue: 5 )