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IEEE Journal of Quantum Electronics

Undershooting and set-reset operation in bistable laser diodes with inhomogeneous excitation

Masakatsu Okada, Kenji Takizawa, Hiroshi Kikuchi, Hideo Fujikake

Published May 1, 1990• 8 citations
Publisher

Abstract

The effect of undershoot switching, downward switching from the upper to the lower state by undershooting caused by the rapid diminishing of the applied optical pulse, is analyzed for bistable laser diodes with inhomogeneous current injection. The height and width of the optical input pulse superposed on the optical bias are shown to play an important role in undershoot switching as well as the level of the optical bias. It is also shown that set-reset and the generation of the optical monostable pulse can be done by using undershoot switching.>

DOI
10.1109/3.55526

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Optics Letters•Aug 1, 1985•17 citations
The effect of undershoot switching, downward switching from the upper to the lower state by undershooting caused by the rapid diminishing of the applied optical pulse, is analyzed for bistable laser diodes with inhomogeneous current injection. The height and width of the optical input pulse superposed on the optical bias are shown to play an important role in undershoot switching as well as the level of the optical bias. It is also shown that set-reset and the generation of the optical monostable pulse can be done by using undershoot switching.>
We show that the reset operation, switching from an upper stable state to a lower one in optical bistable devices, is achieved by means of a positive optical pulse through undershoot-switching, in contrast with conventional downward switching by means of optical pulses negative relative to an optical bias level. Flip-flop and set-reset operations are demonstrated by using only positive optical pulses in an electrooptic bistable device, in which similar operations can also be achieved by applying electric pulses on a biased optical input.
Optical injection effects and all-optical set-reset operations in two-segment strained multiquantum-well (MQW) distributed feedback (DFB) bistable lasers were experimentally investigated. The optical bistable characteristics under detuned optical injection, of strained MQW DFB bistable lasers, show the effect of the residual Fabry–Perot side modes of the DFB structures; optimizing the input wavelength and the input power is suggested for applications. The switching properties of dynamic optical set-reset operations with pulsed optical injection were reported, which appear to be related to the optical bistable characteristics under cw optical injection; however, the switching transients are found to be essential to full understanding of these switching properties.
Optical bistability in a Fabry-Perot semiconductor laser amplifier when two optical inputs detuned from the resonant wavelength of a semiconductor laser amplifier are injected is discussed. A split branch is found in the optical output versus input characteristics in addition to conventional optical bistability behavior. It is shown analytically and experimentally that set and reset can be achieved in the optical output of the semiconductor laser amplifier for each wavelength by applying two detuned optical pulses and using the split branch.>
The switch-off time in a dispersive bistable laser amplifier is usually considered to be limited by the inverse of the effective carrier lifetime, the switch-off can be faster with the laser diode operating very near threshold. On the other hand, optical bistability (OB) has also been found recently in optically injection-locked semiconductor lasers; in this case however the dynamic properties have not yet been investigated. Our measured results reveal that the OB switch-off can be much faster than the carrier lifetime when the slave laser is biased far above threshold. In the experiment, two identical 1554 nm DFB-BH laser diodes ase used in the master-slave mode.>