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PROPAGATION PHENOMENA OF NONLINEAR GUIDED-waveS IN GRADED-INDEX PLANAR wave-guides

IEE PROCEEDINGS-J OPTOELECTRONICS 1991年第6期138卷 365-372页

作者： MIHALACHE, D MAZILU, D Department of Theoretical Physics Institute of Atomic Physics Bucharest Romania

The dispersion relations, stability to propagation, absorption effects and Gaussian beam excitation of nonlinear TE waves guided by graded-index planar waveguides with both Kerr-law and saturable nonlinear cladding media are discussed numerically. The spatial soliton emission and the effects of linear absorption on spatial soliton emission in graded-index planar waveguides with Kerr-like nonlinear cover media are investigated by numerical techniques. The stationary field distribution and the guided wave power flow-effective mode index relationship are obtained using the finite element method. The propagation down the waveguide of nonlinear TE waves excited by a specific input beam is investigated numerically using the Crank-Nicolson finite-difference scheme combined with the Newton-Picard method for solving the corresponding system of nonlinear equations.

关键词： optical wave-guides

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DETERMINATION OF REFRACTIVE-INDEXES AND THICKNESS OF ABSORBING CRYSTALLINE THIN-FILMS BY USING PRISM COUPLER

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FIBER AND INTEGRATED OPTICS 1994年第3期13卷 293-308页

作者： WANG, HM [a]Centro de Investigaciones en Optica Mexico

An improved method has been implemented to study the reflection of optical plane waves from anisotropic and absorbing films. The reflection from anisotropic nonabsorbing films and from isotropic nonabsorbing films can be shown as some special cases. The method in this paper can be applied to almost all kinds of materials involved in optical films and integrated optics studies. Guided waves in the anisotropic and absorbing waveguides are determined, and the prism coupler method is employed to determine refractive indices and thickness of the anisotropic and absorbing films. The results show that when we only couple light beams into films with small effective indices, the effect of the absorption can be neglected.

关键词： INTEGRATED OPTICS optical PROPERTIES optical wave-guides THIN FILMS

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Slowing light with Fabry-Perot resonator arrays

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JOURNAL OF THE optical SOCIETY OF AMERICA B-optical PHYSICS 2007年第11期24卷 2763-2769页

作者： Poon, Joyce K. S. Chak, Philip Choi, John M. Yariv, Amnon CALTECH Dept Elect Engn Pasadena CA 91125 USA CALTECH Dept Appl Phys Pasadena CA 91125 USA

We analyze the transmission of light through coupled-resonator optical waveguides in the form of evanescently coupled Fabry-Perot resonator arrays. We develop a transfer matrix method to calculate the amplitude and phase responses of the arrays. We also discuss the inclusion of optical gain in the system to compensate for losses in these structures. Owing to the compact length along the propagation direction in evanescently coupled arrays, large slowing factors of the order of 10(2)-10(3) can be achieved even with a weak index contrast of similar to 0.1%. The large slowing factor, coupled with weak index contrast, makes this structure a promising candidate for artificial slow light system. (c) 2007 optical Society of America

关键词： optical wave-guides DELAY-LINES FILTERS TRANSMISSION

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COUPLED-MODE ANALYSIS OF SUPERIMPOSED PHASE GRATING GUIDED-wave STRUCTURES AND INTERGRATING COUPLING EFFECTS

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optical ENGINEERING 1993年第9期32卷 2054-2063页

作者： MINIER, V XU, JM Univ. of Toronto (Canada) Univ. of Toronto (Canada)

We present a detailed coupled-mode analysis of superimposed phase grating guided-wave structures for multibeam splitting (MBS) and wavelength demultiplexing (WDM) applications, taking into account the intergrating coupling effects. The case of small angular separation between the output waves and the case of small wavelength separation between the spectral components of the input wave, which are of great importance for high fanout devices and have so far not been adequately treated, have been examined. For the MBS case (single-wavelength diffraction), critical parameters affecting the diffraction characteristics are found to be the relative index modulation between the gratings, the relative and absolute angular positions of the diffracted waves, the number of gratings, and the wavelength and polarization of the incident wave. For the WDM case (multiwavelength diffraction), wavelength separation between the spectral components of the incoming beam is shown to be an additional critical parameter, due to parasitic waves in undesired output channels. To obtain high-performance devices (high fanout density, high channel efficiencies, high angular and wavelength selectivities, and low cross talks between channels), the analysis suggests the use of long grating structures with large diffraction angles and gratings with close index modulations.

关键词： optical wave-guides BRAGG DIFFRACTION SUPERIMPOSED GRATINGS optical INTERCONNECTS BEAMSPLITTER

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Self-collimation in photonic crystal structures: a new paradigm for applications and device development

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JOURNAL OF PHYSICS D-APPLIED PHYSICS 2007年第9期40卷 2635-2651页

作者： Prather, Dennis W. Shi, Shouyuan Murakowski, Janusz Schneider, Garrett J. Sharkawy, Ahmed Chen, Caihua Miao, BingLin Martin, Richard Univ Delaware Dept Elect & Comp Engn Newark DE 19716 USA EM Photon Inc Newark DE 19711 USA

In this paper, we report on the development of the self-collimation phenomenon in photonic crystal structures for integrated optics applications. In addition, detailed numerical analysis, design procedures, fabrication and characterization techniques are included. Applications presented in this paper include: channelless waveguiding, orthogonal bending of light, tunable beam splitter, all-optical analog-to-digital converter, reconfigurable optical switch, chemical/gas sensor and a three-dimensional optical interconnect bus.

关键词： TO-DIGITAL CONVERTER optical wave-guides EFFICIENCY MODES BEAMS SLABS SUPERPRISM DESIGN BENDS

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Simulation of ti diffusion into LiNbO₃ in li-rich atmosphere

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JOURNAL OF APPLIED PHYSICS 2007年第1期101卷 013101.1-013101.1页

作者： Zhang, De-Long Zhuang, Yu-Ran Hua, Ping-Rang Pun, E. Y. B. Tianjin Univ Coll Precis Instruments & Optoelect Engn Dept Optoelect & Informat Engn Tianjin 300072 Peoples R China City Univ Hong Kong Dept Elect Engn Kowloon Hong Kong Peoples R China

A model is proposed for describing two-dimensional diffusion of Ti into an initially congruent LiNbO3 crystal under a Li-enriched atmosphere created by a mixed two-phase (Li3NbO4 and LiNbO3) powder at elevated temperature [vapor transport equilibration (VTE)]. The influence of VTE treatment on Ti diffusivity is considered in the model. To solve the model, four key input parameters including Li-concentration-dependent Li and Ti diffusivities and two switching times t(1) and t(2) were determined. Prior to solve the Ti-diffusion model, a one-dimensional VTE model is solved at first to obtain the dynamic Li2O concentration depth profile. Both the Li-diffusion and Ti-diffusion models were solved by using finite difference method. Based on secondary-ion-mass spectrometry analysis, the validity of the VTE and Ti-diffusion models as well as the numerical method employed are confirmed. After that, diffusion at 1100 degrees C of an 8-mu m-wide, 100-nm-thick Ti strip defined on the surface of a Z-cut or an X-cut substrate was simulated for the VTE duration up to 130 h. Based on the numerical results, the Ti-(Li-)diffusion characteristics are discussed in the aspects of (1) the relation of depth and width profile function of Ti concentration to the VTE duration, (2) the substrate cut effect on both the Ti and Li diffusions, (3) the relation of the 1/e Ti-concentration depth and half-width to the VTE duration, and (4) the VTE duration dependence of the mean [Li]/[Nb] ratio within the Ti-diffused layer. (c) 2007 American Institute of Physics.

关键词： optical wave-guides ION-MASS-SPECTROMETRY STOICHIOMETRIC LITHIUM-NIOBATE VAPOR TRANSPORT EQUILIBRATION X-RAY-DIFFRACTION TITANIUM DIFFUSION HIGH-TEMPERATURE NEAR-FIELD PHASE waveLENGTH

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COUPLED-MODE FORMULATION OF PARALLEL DIELECTRIC wave-guides USING SINGULAR PERTURBATION TECHNIQUE

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MICROwave AND optical TECHNOLOGY LETTERS 1991年第11期4卷 486-491页

作者： YASUMOTO, K Department of Computer Science and Communication Engineering Kyushu University 36 Fukuoka 812 Japan

A new coupled-mode formulation for parallel dielectric waveguides is presented by using a singular perturbation technique. The theory is applied to two parallel, planar dielectric waveguides and the coupled-mode equat... 详细信息

关键词： optical wave-guides COUPLED-MODE THEORY

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FINITE-CLADDING FIBERS - HE12 AND LOCAL-NORMAL-MODE COUPLING EVOLUTION

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IEE PROCEEDINGS-J OPTOELECTRONICS 1991年第5期138卷 330-336页

作者： BLACK, RJ BURES, J LAPIERRE, J Départment de génie physique Laboratoire d'optique guidée et d'opto-électronique Université de Montréal Montreal Canada

A discussion of the evolution of the HE12 (LP02) field, and thus the role of the core in HE11-H12 (LP01-LP02) local-mode coupling for a tapered 'doubly-clad' lightguide as may be formed by the combination finite-cladding fibre and external medium (i.e. outer cladding) is presented. Consideration of more than one interface injects interesting novel features into the local-normal-mode viewpoint: examination of the HE12 lobe maximum and field evolution leads to the discovery of a core/cladding bounce phenomenon (related to an HE12 leaky-mode property) as well as an intriguing coupling phase dependence.

关键词： optical FIBERS optical wave-guides

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EFFICIENT QUASIPHASE-MATCHED GENERATION OF PARAMETRIC FLUORESCENCE IN ROOM-TEMPERATURE LITHIUM-NIOBATE wave-guides

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ELECTRONICS LETTERS 1993年第17期29卷 1539-1540页

作者： BALDI, P NOUH, S DEMICHELI, M OSTROWSKY, DB DELACOURT, D BANTI, X PAPUCHON, M THOMSON CSF LCRF-91404 ORSAYFRANCE

The Letter reports the first observation of waveguided, quasiphase-matched, parametric fluorescence at 1.2-2.5 mum at ambient temperature, using an 800 nm pump. Fluorescent powers of 10(-15)-10(-14) W were obtained fo... 详细信息

关键词： LITHIUM NIOBATE optical wave-guides LUMINESCENCE NONLINEAR OPTICS

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S-BENDS USING OFFSETS IN FIBER-COMPATIBLE K+-NA+ ION-EXCHANGED GLASS wave-guides

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ELECTRONICS LETTERS 1991年第4期27卷 379-380页

作者： VANDERTOL, JJGM VERHOOF, JW DIEMEER, MBJ PENNINGS, ECM DELFT UNIV TECHNOL DEPT ELECT ENGN2600 GA DELFTNETHERLANDS

Results on S-bend losses in fibre-compatible K+-Na+ ion-exchanged waveguides are presented. For the first time a distinction has been made between pure bend loss and transition loss. Experimental results are compared to those of two theoretical models. Lateral offsets in waveguide junctions to reduce transition loss are investigated. This set of results can be used to optimise the design of S-bends with respect to length and loss.

关键词： wave-guides optical wave-guides

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