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Fabry-Perot electroabsorption modulators for high-speed free-space optical communication

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5 Author(s)
Qin Wang ; Opt. Eng. Dept., Acreo AB, Kista, Sweden ; Junique, S. ; Agren, D. ; Noharet, B.
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Retroreflective modulators are key components in free-space optical communication systems between mobile platforms and users. Wide-aperture surface-normal electroabsorption modulators based on GaAs-AlGaAs quantum wells embedded in an asymmetric Fabry-Perot cavity are designed and fabricated with a high yield process on 10-cm wafers. It is shown that the modulator yield and its speed are improved significantly by a pixellated approach in which monolithic modulators are divided into 4-64 pixels. The fabricated 1.5×1.5 cm2 devices exhibit contrast ratios of 8 dB at a driving voltage of 8 V and a modulation frequency higher than 10 MHz, which provides low noise and fast data transmission for long distance free-space optical communication.

Published in:

Photonics Technology Letters, IEEE  (Volume:16 ,  Issue: 6 )