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Here we report spontaneous conical wave formation in quadratic and cubic nonlinear media, demonstrating how the characteristics of the formed conical wave strictly depend on those of the pumping source.
Recent results obtained at 3S PHOTONICS on 980 nm high power single-mode pump lasers are reviewed, with emphasis on the challenges that still exist in this mature technology and on new development trends.
Continuous wave second-harmonic generation was demonstrated in quasi-phase-matched GaAs/AlGaAs superlattice-core waveguides formed by periodic intermixing. Output second harmonic powers of 950 nW were recorded. Bistability was observed when tuning either the input power or wavelength.
We demonstrate cascade green light-emitting-diode (LED) arrays, which have superior output-power to single LED without sacrificing modulation-bandwidth. 80 Mbit/sec eye-opening with a 0.65 mW coupled power to plastic-optical-fiber is achieved under the output of in-car battery (12 V).
We demonstrate an experimental emulator for evaluating pointing, acquisition, and tracking performance of laser communication systems. Results show the ability to assess the performance impact from a wide range of impairments relevant to air-to-space links.
Our simulations and experiments demonstrate a new physical mechanism for detecting acoustic waves of THz frequencies. Detectable THz-frequency radiation is generated when the acoustic wave passes a piezoelectric interface.
Photocurrent imaging was used to study the potential profiles in a graphene transistor. The impact of source/drain metal electrodes on potential profile of the graphene channel extends beyond the contact for a few hundred nanometers, and varies considerably with gate bias.
This article discusses the fabrication of a quantum cascade laser by metal-organic-chemical-vapor-deposition (MOCVD). The emission spectrum of the fabricated laser was obtained. The threshold current density under pulse measurements was investigated against reciprocal cavity length.
A wide temperature tunable laser packaging platform has been developed for avionic WDM LAN applications. The packaged tunable laser transmitter has successfully undergone 500 temperature cycles. It has a wide operating temperature range of -55degC to 95degC with a single mode fiber coupled output power of >1 mW. The transmitter can be directly modulated at 2.5 Gb/s and has 4-channel tunability...
The paper reports design, fabrication and simulation of a polymeric Bragg grating rib waveguide device using solvent assisted microcontact molding (SAMIM) through a single mold.
We present complex refractive index measurements of Pd and Pt films from 700-1700 nm using variable angle spectroscopic ellipsometry. Refractive index changes upon H2 gas adsorption were determined by measuring normal incidence reflection and transmission.
Light pulses from a femtosecond laser can be coherently upconverted to generate light in the extreme-ultraviolet and soft x-ray regions of the spectrum using high-order harmonic generation, a process where a large number of photons from an intense laser can be coherently combined. Advances in laser technology, combined with a better understanding of the high harmonic process, have made it possible...
We report a novel design for high-speed all-optical OFDM employing coupler interferometry for IFFT/FFT. 160-Gb/s DQPSK transmission using eight sub-carriers was simulated, while 25-Gb/s DPSK experiment using two sub-carriers was performed using matched delay interferometers.
Electronic digital signal processing is currently introduced in various subsystems of modern optical high-speed transceivers. Traditionally, electronic processing was basically limited to tasks like MUX/DEMUX, clock and data recovery and various synchronization loops as well as analog circuitry like modulator drivers or limiting amplifiers. In order to deal with advanced systems and with the need...
The emergence of capable semiconductor processes has spawned DSP-supported optical transmission solutions which extend system application ranges at the highest capacities. Examples of DSP applied to channel optimization are presented and attendant optical layer implications are discussed.
We propose a method of making multi-wavelength VCSEL arrays using surface nano-machining process. Preliminary results of 4-channel 980 nm VCSEL array with 5.4 nm wavelength spacing by multi-step wet etching of spacer layer are presented.
We demonstrate 100 GHz (W-band) photonic signal generation at 775 nm by optical modulation and spectral shaping at 1.55 mum combined with second harmonic (SH) generation with a periodically poled lithium niobate waveguide.
We have reported a method to achieve small half-wave voltage for high-speed MMI-MZI GaAs/GaAlAs electro-optic modulators and switches with co-planar electrodes for polarization-insensitive operation. By biasing the devices at the reverse breakdown region, the voltage to achieve switching can be greatly reduced about 23 V to 3 V. Such a small half-wave voltage would be very important for high-speed...
We have successfully demonstrated wavelength-shift-free, widely pulsewidth-tunable, all-optical signal conversion with low power penalties of less than 1.0 dB in a wide pulsewidth tuning range between 13.0 ps and 3.06 ps at 10 Gbit/s.
In this work, we review our progress developing techniques for printing transparent transistors using various routes to realize solution-processed zinc oxide. We demonstrate printable ZnO inks based on ZnO nanoparticles, and realize transistors using this material as the channel. Additionally, we demonstrate a novel process for fabricating ZnO devices using chemical bath deposition. Pre-patterning...
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