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.
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Takenaka et al. (2004) studied this question.
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