Phase-locked single-cycle transients with frequency components between 1 and 60THz and peak fields of up to 12MV/cm are generated as the idler wave of a parametric amplifier. To achieve broadband conversion in GaSe nonlinear crystals, we match the group velocities of signal and idler components. The influence of group-velocity dispersion is minimized by long-wavelength pumping at 1.18mum. Free-...

Femtosecond phase-coherent two-dimensional (2D) spectroscopy has been experimentally demonstrated as the direct optical analog of 2D nuclear magnetic resonance. An acousto-optic pulse shaper created a collinear three-pulse sequence with well-controlled and variable interpulse delays and phases,which interacted with a model atomic system of rubidium vapor. The desired nonlinear polarization was ...

Qin Wang, Fei Xu, Zi-yan Yu, Xiao-shi Qian, Xi-kui Hu, Yan-qing Lu and Hui-Tian Wang National Laboratory of Solid State Microstructures Nanjing University, Nanjing 210093, China Abstract—we propose a bidirectional acousto-optic tunable optical diode based on a periodically poled lithium niobate (PPLN) waveguide with defect. An acoustic wave propagates together with the light beam so that a coll...

Eigenvalues of higher multiplicity of the Nonlinear Fourier Transform (NFT) are considered for information transmission over fiber optic channels. The effects of phase, time or frequency shifts on this generalized NFT are derived, as well as an expression for the signal energy. These relations are used to design transmit signals and numerical algorithms to compute the direct and inverse NFTs, a...

We review the research progress concerning some fundamental issues related to polarization-mode dispersion (PMD) in high-speed fiber-optic transmission systems. We pay particular attention to issues such as the PMD-induced pulse broadening, PMD measurement and emulation, as well as PMD compensation. An electrical equalization technique based on a transversal filter and an optical technique base...

We determine the ultimate classical information capacity of a linear time-invariant bosonic channel with additive phase-insensitive Gaussian noise. This channel can model fiber-optic communication at power levels below the threshold for significant nonlinear effects. We provide a general continuous-time result that gives the ultimate capacity for such a channel operating in the quasimonochromat...

These set of notes describe cavity optomechanics in the presence of additional thermo-optic tuning of the cavity resonance. We find that thermo-optic tuning results in correction factors to both the optical spring and optomechanical gain. In addition there is an overall saturation of the optomechanical coupling. These effects can be large for systems with large static thermo-optic tuning and fa...

Neurons involved in the processing of optic flow are usually analyzed using stimuli designed by the experimenter. However, in real life optic flow depends on locomotive behavior. We characterized the performance of motion-sensitive neurons in the visual system of the fly using optic flow as occurring in behavioral situations during object fixation. Optic flow generated by tethered flying flies ...

Artificial neural networks (ANNs) are usually designed around vector-matrix multipliers, where the inputs to the neurons are represented by the vectors while the interconnection weights are represented by the matrix. Optics, with its interferenceless free-space communication capabilities, is therefore an efficient and natural way to implement ANNs; however, it is not without practical problems....

1. We used standard, single-cell recording techniques to study the response properties of 34 W-cells in the C-laminae of the cat's lateral geniculate nucleus. By W-cell, we mean a poorly responsive geniculate neuron that receives slowly conducting retinal afferents; these are quite distinct from geniculate X- and Y-cells. Our measurements included response latency to optic chiasm stimulation, p...