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We study the nonlinearity in a modified unitraveling-carrier (MUTC) photodetector with a drift-diffusion model. We show that the Franz-Keldysh effect has a strong effect on the third-order intermodulation distortion (IMD3).
We experimentally demonstrate a compact optical steganography method using chirped fiber Bragg gratings. The stealth signals are carried by wide band amplified spontaneous emission noise, which has strong dispersion effect for pulse stretching.
We review the integration of III–V semiconductors on silicon photonic integrated circuits as a way of realizing fully integrated silicon photonic transceivers and short-wave infrared spectroscopic sensors.
Optical four-level pulse amplitude modulation (PAM-4) is investigated for data center applications with reach significantly greater than 10–40km standards, such as for synchronous data mirroring up to 100km or asynchronous applications with reaches beyond 100km.
Soliton dynamics, coupled with either plasma formation or molecular modulation, enable the efficient generation of ultrafast vacuum-ultraviolet light pulses in gas-filled hollow-core photonic-crystal fibres. We review the theory, experiment and future prospects of these sources.
We report highly-nonlinear ultrathin metasurfaces based on coupling of plasmonic nanoresonators with intersubband nonlinearities. Nonlinear susceptibilities over 1×106 pm/V and conversion efficiencies ∼0.1% were measured for second harmonic generation in mid-infrared for 10 kW/cm2 input intensity. Complete phase control of local nonlinear response is demonstrated.
A new quantum well, namely InGaAsP/InAlGaAs, is used for electroabsorption modulator. High band-offset ratio between well and barrier induces strong exciton effect, leading to low fiber-to-fiber loss of −8dB, >25dB extinction ratio, and >30GHz bandwidth.
A true linearized intensity modulator for pulsed light is demonstrated using an injection-locked three-section mode-locked laser. A low Vπ of 1.1 mV and SFDR of 75 dB.Hz2/3 are achieved by modulating the phase section.
A compact monolithically integrated Mach-Zehnder Interferometer Modulator operating above 1Gbps is demonstrated in an unmodified 180nm CMOS SOI process. This 50µm long structure allows for high density integration of photonics modulators and electrical driver circuitry on a single standard CMOS chip.
We present a high power semiconductor Master Oscillator Power Amplifier monolithically integrated on InP, which includes a modulation section. This device can be used for random-modulation-continuous wave lidar systems or free-space communications.
The linewidth broadening factor (α) of a mid-infrared quantum cascade laser is investigated above threshold with two different methods. The α is found strongly dependent on the operating conditions with a maximum value of 3.5.
The FABULOUS EU project aims at demonstrating the effectiveness of a self-coherent reflective FDMA WDM PON architecture, and we show real-time transmission at 1 Gbps to 32 users over a 40 Km fiber test-bed.
A new microwave photonic mixer with high carrier-to-noise ratio (CNR) is proposed. By bidirectional phase modulation, gain and noise performance can be improved simultaneously. The experimental results show that CNR is improved by 21.3 dB.
An optical frequency-interleaving full-duplex transmission of 96-GHz-band frequency-modulated continuous-wave downlink signal and 10-Gb/s on-off-keying uplink signals is investigated. The proposed full-duplexing transmission with a flexible wavelength channel selector over 10-km fiber-optic link is experimentally demonstrated.
We have proposed and experimentally demonstrated a broadband polarization rotator based on the augmented-low-index-guiding platform which consists of both silicon and silicon nitride layers as the waveguide core. With single etching process and silica cladding, the device is compatible with photonics integrated circuits.
A review is presented on how diagnostic studies, technological and design improvements and novel device configurations have enabled a more than fourfold improvement in lateral brightness in high power diode lasers, which demonstrate > 4W/mm-mrad.
We demonstrate several properties of the fractal architecture that are exploitable for optical signals processing, notably robust spatial multiplexing. Any fraction of a received signal will completely recreate a signal transmitted with a fractal architecture.
A photonic integrated circuit comprising multi-mode interference couplers and phase modulators is proposed for frequency 8- and 24-tupling. Simulations of the dc-less and filter-less architecture show over 69 dB of signal to unwanted harmonic ratio.
Integration of UVA-developed high power photodiodes into a novel RF package co-designed with a wide-bandwidth, fragmented aperture antenna for fiber-fed, array antenna applications.
We report on a plasmonic metasurface that exhibits polarization-selective switching of extraordinary optical transmission at different spectral bands. Polarization-selective switching of EOT was experimentally demonstrated.
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