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Using a tape-assist-transfer method and micromanipulation, we have fabricated graphene coated ZnO nanowire (GZN) optical waveguides. The GZNs exhibit significant saturable absorption (differential transmission of 15% at 1064nm), which can be employed for optical modulation.
We investigate degradation of QPSK CO-OFDM system due to components most susceptible to high PAPR. We vary transmitter design parameters and uncover appropriate working conditions and clipping effectiveness regions.
We retrieve the thermal dissipation time of τ=0.25µs and investigate the power dependent absorption in a SiN microring resonator. We estimate n2=4.3×10−19m2/W based on clear 1 GHz optical modulation of the refractive index.
We investigate methods to modulate the photodiode responsivity for high-speed photodetection, i.e., parametric down-conversion. Electrical modulation is preferred over optical modulation and gives near optimum efficiency of ∼20%. Applications are near- and mid-infrared spectroscopy methods.
We demonstrate selective mode splitting (SMS) in microresonators. SMS can split one selected optical mode up to 1.25 nm with other modes unperturbed. This opens a new gate for phasematching in parametric oscillations in microresonators.
High-energy laser systems use optical signals with multiple sinusoidal phase modulations for on-target smoothing and stimulated Brillouin scattering suppression. The spectrum and temporal frequency-modulation-to-amplitude-modulation conversion of these signals are analytically studied.
A method to produce flat, rectangular shaped frequency combs with tunable bandwidth and spacing is shown. It is based on the selection of lines from a mode-locked laser and a following modulation with cascaded modulators.
We have successfully generated a 380 fs pulse train at 40 GHz from an actively mode-locked erbium fiber laser with an InGaAlAs/InAlAs MQW nonlinear PM/AM modulator using the Pockels effect and the quantum confined Stark effect.
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