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Pixels consisting of a single vertical-cavity laser thyristor and a double vertical-cavity phototransistor

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7 Author(s)
Kosaka, H. ; Opto-Electron. Res. Labs., NEC Corp., Ibaraki, Japan ; Ogura, Ichiro ; Saito, H. ; Sugimoto, M.
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Bidirectionally cascadable optical pixels that consist of a single-vertical-cavity surface-emitting laser (VCSEL) thyristor and a double-vertical-cavity phototransistor are proposed. Despite almost identical layer structures, each device characteristic can be independently optimized by introducing a lambda /2-spacer layer into the phototransistor section. A lasing threshold of 0.8 mA and a slope efficiency of 0.25 W/A are obtained for the laser thyristor, and a flat-topped photocurrent spectrum over 30 A and a photocurrent gain of 70 A/W are obtained for the phototransistor at the resonant wavelength. This work demonstrates the possibility of monolithic integration using thermal desorption and a regrowth technique and the suitability of these devices for massively parallel optical interconnections.<>

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Photonics Technology Letters, IEEE  (Volume:5 ,  Issue: 12 )