In this article, we analytically investigate the spectral broadening by self-phase modulation of strongly chirped optical pulses. The dispersion due to the nonlinear optical process is expressed as functions of a linear and a nonlinear initial chirp. As a result, it is found that the third-order dispersion strongly depends on the initial linear chirp and the nonlinearity for self-phase modulation.

An optical beam is said to be self-healing when, distorted by an obstacle, the beam corrects itself upon propagation. In this Letter we show, through experiments supported by numerical simulations, that Helico-conical optical beams self-heal. We observe the strong resilience of these beams with different types of obstructions, and relate this to the characteristics of their transverse energy flow.

We performed a reverse process of the usual optical data analysis of boson-exchange superconductors. We calculated the optical self-energy from two (MMP and MMP+peak) input model electron-boson spectral density functions using Allen's formula for one normal and two (s- and d-wave) superconducting cases. We obtained the optical constants including the optical conductivity and the dynamic dielect...

A comprehensive theory is developed for describing the nonlinear propagation of optical pulses through silicon waveguides with nanoscale dimensions. Our theory includes not only the vectorial nature of optical modes but also the coupling between the transverse electric and magnetic modes occurring for arbitrarily polarized optical fields. We have studied the dependence of relevant nonlinear par...

Determining the optical Pow is an ill-posed problem, and requires the inclusion of a regularization term for solution. In this paper we show that ordered maps produced through self-organization reflect the topological relationships of the input, and can thus inherently supply the constraints required in obtaining the optical flow. Our computational procedure is thus based on training a self-org...

Sindy K.Y. Tang , Ratmir Derda , Aaron D. Mazzeo , and George M. Whitesides * IO N A method that uses magnetic fi elds to template the self-assembly and reconfi guration of 2D optical components with engineered surface wettabilities at a liquid–liquid interface is described. The optical components are mesoscale tiles of diffraction gratings each fabricated to contain a magnetic strip. Applicati...

We propose an information organizer for e ective clustering and similarity-based retrieval of text and video data. Instead of giving keywords or authoring them, we use a vector space model and DCT image coding in order to extract characteristics of data. Data are clustered by Kohonen's self-organizing map, and the result is visualized in a 3D form. By this, similarity-based retrieval is achieve...

So far the bottleneck of Chinese character recognition, especially handwritten character recognition, still lies in the effectiveness of featureextraction to cater for various distortions and position shifting. In ths paper, a novel method is proposed by applying a set of Gabor spatial filters with different directions and spatial frequencies to character images, in an effort to reach the optim...

Passive optical matched-filtered detection (MFD) has been employed in many proposed optical pulse code division multiple access (CDMA) system implementations, driving the development of unipolar pseudo-orthogonal codes (incoherent). In this paper, coherent optical pulse CDMA systems based on coherent correlation detection (CCD) through homodyne correlation detection (HCD) and self-HCD directly ...

Sensitive analog systems in mixed-signal VLSI circuits may be vulnerable to digital noise. We demonstrate a possible solution by optically remoting charge packets with a multiplequantum-well self-electrooptic effect device in a novel self-linearized mode. c © 2000 Optical Society of America OCIS codes: (230.4110) Modulators; (200.4650) Optical interconnects In such mixed-signal VLSI electronic ...