162,154 research outputs found
Low power resettable optical fuse based on the amorphous silicon ARROW fiber
No full textWe present a silicon antiresonance reflecting optical (ARROW) fiber that has power dependent transmission properties. When the throughput power exceeds a nominal value the transmission band structure closes and the fiber can no longer transmit light
Integration of optical fiber and optoelectronic devices
No full textThere is much current interest in integrated nanophotonics, as evidenced by the large amount of literature regarding silicon photonics, integration of direct bandgap semiconductors onto silicon chips, and related topics. Our group has been pursing a different, potentially complementary vision of all-fiber optoelectronics in which light can be generated, modulated, and detected within the fiber itself. Fiber devices are in general valued for their robustness, simplicity, and ability to integrate seamlessly with existing fiber infrastructure. If the light never leaves the fiber, for example, difficulties associated with modal and impedance mismatches between fibers and planar semiconductor waveguides do not need to be overcome. Fiber lasers also integrate naturally with fibers, whereas using direct gap semiconductor lasers on chip remains an ongoing challenge
Active semiconductor fibers and devices
No full textUnary and compound semiconductors have been deposited into microstructured optical fibers to make junction-based fiber devices, very high power infrared fibers, mid-infrared fiber lasers, and nonlinear hydrogenated amorphous silicon fibers
Ultrafast all-optical modulation in silicon optical fibers
No full textDegenerate and non-degenerate two-photon absorption based modulation is demonstrated in a hydrogenated amorphous silicon core optical fiber. We show modulation using femtosecond pulses and compare this with theory
Mid-infrared transmission properties of step index and large mode area ZnSe microstructured optical fibers
No full textZnSe microstructured fibers have been designed and fabricated using silica capillaries and an air-silica photonic band-gap optical fiber as high-pressure microfluidic templates for semiconductor growth via chemical fluid deposition. We examine their transmission properties over a wide spectral range
Towards in-fiber silicon photonics
No full textThe state of the art of silicon optical fibers fabricated via the high pressure chemical deposition technique will be reviewed. The optical transmission properties of step index silicon optical fibers will be presented, including investigations of the nonlinearities that can be used for all-optical signal processing. In addition, alternative complex fiber geometries that permit sophisticated control of the propagating light will be introduced
Simultaneous tapering and crystallisation of silicon core optical fibres
No full textSilicon photonics is an increasingly active and exciting research topic that owes much to the excellent optical material properties of silicon. Crystalline silicon has a high refractive index (~ 3.48 @ 1.5 µm), a low loss transmission window between 1.2 µm - 6.7 µm, and a large third order optical nonlinearity (orders of magnitude greater than that of silica) making it a highly attractive material for photonic device miniaturisation. A new class of silicon waveguide, the silicon optical fibre, consists of a silicon core and a silica cladding and offers new possibilities within silicon photonics. To truly exploit the nonlinear properties of this fibre, control over its waveguiding characteristics is desirable
Effect of core size on nonlinear transmission in silicon optical fibers
No full textThe nonlinear transmission properties of two hydrogenated amorphous silicon fibers with core diameters of 5.7µm and 1.7µm are characterized. The measured Kerr nonlinearity, two-photon absorption and free-carrier parameters will be discussed in relation to device performance
Cross-phase modulation in a hydrogenated amorphous silicon optical fiber
No full textWe experimentally demonstrate cross-phase modulation (XPM) in a hydrogenated amorphous silicon-silica optical fiber. Additional numerical analysis shows that shifts in the probe wavelength are induced by the pump indicating potential for Kerr based switching applications
Characterization of thermal induced nonlinear effects in silicon microcylindrical resonators
No full textWe explore the thermal nonlinearity in hydrogenated amorphous silicon microcylindrical resonators that are fabricated from the silicon optical fiber platform. In particular, we use a pump/probe technique to experimentally determine the thermal response time from which we can infer the material absorption coefficient
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