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A wide number of applications, such as THz signal generation, ultrafast optical clocking and next generation optical communication systems require high repetition rate optical pulses. Passively mode-locked semiconductor lasers using saturable absorbers (SAs) in a Fabry-Pérot configuration are excellent candidates, providing high-quality pulse trains in a very compact device [1]. The technical difficulties...
Graphene has already become an established medium for novel photonic devices and their applications. In some cases, e.g. the use of graphene as a non-linear medium with saturable absorption properties, it is experimentally convenient to use the readily available form that is known as graphene oxide. Moreover, technological and scientific developments that are advancing control of the properties of...
Device structures in high refractive index materials, notably semiconductors such as silicon, will form the basis for high-density integrated photonics. Nanometre-scale structuring - in conjunction with photonic crystal, photonic wire and plasmonic/metamaterial principles - will be required in order to realise the full potential for a variety of applications.
In this work we present the design and first experimental demonstration of integrated-waveguide, ultra-fast all-optical differentiator based on π-phase-shifted Bragg gratings. Such a photonic device was achieved in deeply-side-etched Silicon-on-Insulator (SOI) ridged waveguides. High coupling coefficient, up to 1.15 *105 m-1, achieved in fabricated set of devices, allows for the wide operational bandwidth,...
We report the theoretical and experimental demonstration of an all-optical temporal differentiator based on π-phase-shifted Bragg gratings fabricated in Silicon-on-Insulator waveguides. All-optical processing of sub-picosecond pulses was performed.
In this work, the authors report on the demonstration of a monolithic semiconductor ring laser (SRL) as an all-optical set-reset flip-flop (SRFF). The SRL has a racetrack cavity, with 150 mum radius connecting two straight sections of 200 mum. Two straight output waveguides provide 4 input/output ports that can be used to inject/extract optical signals. The devices operate continuous wave at room...
RF signals for radio over fibre systems (RoF) can be generated optically by mode-locking (ML) in semiconductor lasers. External optical injection at non-lasing cavity modes of semiconductor ring laser (SRL) generates strong cavity enhanced four-wave mixing(FWM), that result in generation of optical waves modulated by high purity RF frequencies as a result of the mode-locking by way of such FWM. This...
In this paper, a fully post-growth device grating geometry based on etched sidewall gratings is presented. The grating is written on a ridge waveguide with the grating recess depth, d, and the waveguide width, W, being design parameters. The grating coupling coefficient, k, and Bragg condition are necessarily related to the grating design parameters through the overlap of the propagating mode with...
A monolithic semiconductor ring laser is operated as an all-optical flip-flop with a response time of 100 ps. Bit-error-rate measurements of repeated set-reset switchings show error-free operation.
A monolithic semiconductor ring laser (SRL) is demonstrated to operate as an all-optical flip-flop that is triggered by optical pulses of 400 ps and 5 ps duration, showing a response time of 130 ps.
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