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International Conference on Photonics in Switching

All-optical flip-flops using injection-locked Fabry-Perot laser diodes

Yu‐Ho Won, J.S. Cho, Yong Deok Jeong, N.L. Hoang

Published Aug 1, 2007• 1 citation
Publisher

Abstract

All-optical flip-flops (AOFFs) using optical bistability of injection-locked Fabry-Perot laser diodes (FP-LDs) are demonstrated. To increase performance of the AOFF, single-mode FP-LDs are introduced. The single-mode FP-LD is used as an auxiliary beam source that sustains the state of AOFF or it is used as a state memory component itself to increase an on-off contrast ratio up to 35 dB.

DOI
10.1109/ps.2007.4300787

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All-optical flip-flops (AOFFs) using optical bistability of injection-locked Fabry-Perot laser diodes (FP-LDs) are demonstrated. To increase performance of the AOFF, single-mode FP-LDs are introduced. The single-mode FP-LD is used as an auxiliary beam source that sustains the state of AOFF or it is used as a state memory component itself to increase an on-off contrast ratio up to 35 dB.
All-optical bistability based on injection locked Fabry-Perot semiconductor laser (FP-LD) and its application in all-optical storage are studied in this paper. Injection locking of FP-LD is experimentally studied in this paper. The output power characteristic of injection locked FP-LD is analyzed experimentally, showing that threshold width of hysteresis loop and the extinction-ratio are influenced by the difference in the injection optical-wavelength detuning. Furthermore, 2.5 GHz optical storage with 10 Gb/s input signal is realized by reasonably setting the control signal power. The feasibility of implementing high-speed all-optical storage is verified by using the injection locked FP-LD, which shows great applicability to the field of high speed optical fiber communication.
This thesis experimentally characterizes the polarization dependence of an all-optical flip-flop (AOFF) based on a resonant-type semiconductor optical amplifier. Previous demonstrations of such an optical-memory device have exhibited poor on-off contrasts of around 3 dB (2:1). Our work maps out the dependence of the bistable hysteresis on the injected polarization state for the first time and clearly shows how to optimize the on-off contrast to achieve 8 dB. Beyond this optimization technique, it also demonstrate a novel technique to achieve and on-off contrast exceeding 30 dB (1000:1).
In this Letter, we present a detailed theoretical and experimental investigation of optical bistability and tristability in dual injection-locked Fabry-Perot laser diodes. The proposed device can be reconfigured between the bistable and tristable regimes, simply by adjusting the power level of the injected control optical signal. The tristability presented in the experiment is achieved for relatively low optical input powers between 1.03 and 1.25 mW, with the output signal ratio of up to 7 dB between stable states. Such a device is a potential candidate for designing trits, a bit analogy in ternary computational logic.