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Realization of all-optical flip-flop using directionally coupled bistable laser diode

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2 Author(s)
Takenaka, M. ; Res. Center for Adv. Sci. & Technol., Univ. of Tokyo, Japan ; Nakano, Y.

A novel all-optical flip-flop device has been realized using a directionally-coupled bistable laser diode (DC-BLD). We have fabricated the DC-BLD by a conventional fabrication technique of LDs. To separate the adjacent electrodes of the directional coupler, an oblique electron-beam evaporation technique was developed. By this self-align process, the two adjacent waveguides of the directional coupler were electrically isolated without employing any additional lithography step. Using the fabricated DC-BLD, all-optical flip-flop has been demonstrated due to the nonlinear effects of the saturable absorber and the directional coupler. The flip-flop operation has been achieved with sufficiently small input optical power level around 0 dBm.

Published in:

Photonics Technology Letters, IEEE  (Volume:16 ,  Issue: 1 )