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Showing 1 to 20 of 68 for “"1550 nm"”.
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Characterization of third order nonlinearities in TiO₂ waveguides at 1550 nm
… does not support two-photon absorption at 1550 nm, has a high refractive index, and a relatively low loss, which allows for high-index-contrast waveguides. The TiO₂ waveguides studied for this thesis were single-mode, with dimensions 200nm x 900nm, deposited on oxidized silicon and overclad …
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Femtosecond fiber lasers at 1550 nm for high repetition rates and low timing jitter
… source laser oscillator; such as operating near 1550 nm in wavelength, multi-gigahertz repetition rates, sub 100 femtosecond pulse widths, and sub 10 femtosecond timing jitters. This thesis describes the design, fabrication, and characterization of three different iterations of mode-locked laser …
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A Narrow-Linewidth Laser at 1550 nm Using the Pound-Drever-Hall Stabilization Technique
Linewidth is a measure of the frequency stability of any kind of oscillator, and it is a defining characteristic of coherent lasers. Narrow linewidth laser technology, particularly in the field of fiber-based infrared lasers, has progressed to the point where highly stable sources are commercially …
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Generation of pulsed dual wavelength erbium doped fiber laser
… in single ring and Figure-8 configurations at 1550 nm and 1560 nm. Analysis and optimization on single wavelength fiber laser and single wavelength pulsed fiber laser give a peak power of -10.70 dBm (8.51x10-2 mW) and -54.01 dBm (3.97x10-6 mW) with signal to noise ratio (SNR) of 59.70 dB and …
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Nonlinear optics for frequency-doubling in nanosatellite laser communication
… properties for the crosslink wavelength (775 nm) compared with the downlink wavelength (1550 nm). Using a frequency-doubler (65 g) allows the transmitter to use Commercial Off The Shelf (COTS) laser communication hardware at 1550 nm, without having to carry a second seed laser, modulator, and …
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Controlling Microbial Colonization and Biofilm Formation Using Topographical Cues
… after one day, a close-packed layer of 630–1550 nm monodisperse spheres prevents cluster formation. Moreover, the film of spheres reduces the density of P. aeruginosa adhered to the solid by 80%. Our data show that when P. aeruginosa adheres to the spheres, the distribution is not random. …
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Optical rectification in semiconductor waveguides
… at telecommunication wavelengths, λ = 1550 nm. By using optical rectification, an electromagnetic pulse is generated in a completely passive semiconductor waveguide. This pulse is coupled in a microwave transmission line with periodically loaded ground electrodes to create a …
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Photonic integrated circuits for optical logic applications
… optical amplifiers (SOA) emitting at 1550 nm are vertically integrated with passive waveguides using the asymmetric twin waveguide technique and the SOAs are placed in a Mach-Zehnder interferometer (MZI) configuration. By sending in high-intensity pulses, the gain characteristics, …
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Iron Garnet Thin Films for Integrated Photonics and Spintronics
… MO figure of merit (FoM) of up to 770° dB⁻¹ at 1550 nm wavelength. Growth of single phase BiYIG on the sidewalls of waveguides is also demonstrated, which can be used in transverse electric-mode devices. Tb₃Fe₅O₁₂ (TbIG), CeTbIG, and BiTbIG films are grown directly on Si substrates without any …
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Structure-property correlations in fluoroaryl functionalized inorganic-organic hybrid polymers for telecom applications
… absorptions at the telecom wavelengths 1310 nm and 1550 nm, gave an impulse to the choice of suitable precursors for the preparation of low-loss ORMOCER® resins. Accordingly, precursor silane mixtures and hydrolysis/polycondensation reaction conditions were chosen and optimized with regard to …
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Monolithic In-Plane Tunable Optical Filter
… system. Filters with a tuning range of 40 nm from a wavelength 1550 nm with a linewidth of 35 nm are demonstrated. Future work will concentrate on improving the filter's optical characteristics, limited by etch-induced facet roughness, and integration with active photonic devices.
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Nonlinear aluminum nitride photonic crystal measurement using tapered fiber
… can achieve an efficient coupling between 780 nm visible light and 1550 nm infrared light. A tapered region is also integrated to improve the light transmission between an optical fiber and an on-chip waveguide. We demonstrate the high value of nonlinear coupling interaction strength, the phase …
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Photonic crystal cavity with self-similar structure and single-photon Kerr nonlinearities
… of Vff ~ 7.01 x 10- 5 [lambda]3 at [lambda] ~ 1550 nm. We show that the extreme light concentration in our design can enable ultra-strong Kerr nonlinearities, even at the single photon level. These features open new directions in cavity quantum electrodynamics, spectroscopy, and quantum …
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Thermal and photochemical vapor deposition of aluminum nitride and gallium nitride
… of the electromagnetic spectrum ($\sim$650 nm to $\sim$1550 nm). The AlGaN material system may be able to extend this range to the visible green, blue and even ultraviolet regions. The current status of work on the column III-nitride system of compound semiconductors is reviewed with special …
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Optical Performance and Prototyping of a Liquid Lens Laser Communications Transceiver
… on qualifying liquid lenses for the space environment, showing a clear path for evaluating their optical performance and constructing prototypes. Lenses from Corning Varioptic (France) and Optotune (Switzerland) are both considered in this work. The liquid lenses undergo environmental testing for …
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Tunable and High Refractive Index Polydimethylsiloxane Polymers for Label-Free Optical Sensing
… from 1.4023 ± 0.0002 to 1.5663 ± 0.0001 at 635 nm and 1.3942 ± 0.0003 to 1.5510 ± 0.0007 at 1550 nm. The ability to use tunable refractive index PDMS films to differentiate between m-xylene and cyclohexane was demonstrated by monitoring changes in refractive index and thickness following …
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Short pulse generation from semiconductor lasers: characterization, modeling and applications
… sobre diodos láser de cavidad vertical a 1550 nm, transmisores ópticos muy prometedores por sus ventajosas características en el entorno de las comunicaciones ópticas en fibra con modulación directa. El elevado ancho de banda previsto para las futuras redes ópticas requiere el conocimiento …
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Experimental designs for efficient free-space multi-spatial-mode optical communication
… free-space optical communication using 1550 nm light at the single photon level. We focus on presenting and evaluating a transmitter-receiver design by giving a precise characterization of its operation, properties, and limitations.
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High fidelity pattern transfer in InP photonic device fabrication
… device fabrication is dimensional control. At 1550 nm, line width tolerance range between 1 pm to 0.05 pm.[1] Although these tolerances are easily achieved using lithography technology such as electron beam lithography (EBL) or 193 nm projection, neither are viable optical options for InP …
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PULSED THz GENERATION BASED ON PHOTOCONDUCTIVE ANTENNA FOR THz TIME-DOMAIN SPECTROSCOPY
… antenna (PCA) THz emitter using a 1550 nm femtosecond (fs) laser. The PCA is fabricated based on the InGaAs and InAlAs multilayer structure. The THz signal is measured using the time-domain spectroscopy system. Both the photocurrent and current change are the key determinants of THz …
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