Showing papers on "Guided wave testing published in 1978"
TL;DR: The use of guided wave optical components for performing logic and computation is proposed, using switches and intensity modulators fabricated on an electrooptic substrate for serial-parallel binary adder.
Abstract: The use of guided wave optical components for performing logic and computation is proposed. The basic logic gates are switches and intensity modulators fabricated on an electrooptic substrate. The states of the switches and modulators are determined by electrical signal voltages. The output signal from each of the gates is intensity-modulated light, while inputs can be electrical signals or a combination of electrical and optical signals. Individual gates can be interconnected on a substrate by dielectric waveguides, so that sequential operations are possible. This is illustrated by a configuration for a serial-parallel binary adder. The propagation delay, as determined by the optical pathlength, is calculated to be of the order of 20–40 psec/gate, assuming that the substrate material is lithium niobate, and the logic voltage level is 5 V.
39 citations
TL;DR: In this paper, the temperature dependence of the observed frequencies of the modes of the GWP was discussed and the dispersion of these modes agrees well with theoretical predictions, but their Raman scattering intensities cannot be described completely by bulk Raman tensors.
21 citations
TL;DR: In this paper, simple exact dispersion relations describing the symmetric first-order Bragg interactions in an active planar dielectric waveguide have been deduced for the case of even TE modes.
Abstract: Simple and asymptotically exact dispersion relations describing the symmetric first-order Bragg interactions in an active planar dielectric waveguide have been deduced for the case of even TE modes. Either the index or the gain is assumed to have a sinusoidal variation in the propagation direction. The guided wave is absolutely unstable in the first-order Bragg region and the characteristics of this instability have been examined. The mode theory is used to obtain the exact dispersion relation from which, by a perturbation expansion, the first-order dispersion relations are determined.
18 citations
TL;DR: In this article, the authors explore light scattering from guided wave polariton modes in thin crystals, under certain conditions, these modes scatter with intensity comparable to that produced by the volume LO phonons.
12 citations
TL;DR: In this article, the authors measured the two-photon absorption coefficient β for the wavelength λ = 1.06 μm, which is in good agreement with the most recent bulk measurements and the theoretical values.
Abstract: The optical perturbation of an infrared wave guided in a GaAs epitaxial layer allows us to measure the two‐photon absorption coefficient β for the wavelength λ=1.06 μm. The use of optical properties of free carriers induced by the two‐photon effect and of guided optical wave techniques strongly enhances method accuracy. The result (β=0.06 cm MW−1) is in good agreement with the most recent bulk measurements and the theoretical values.
7 citations
15 Dec 1978
TL;DR: The use of light in inertial rotation sensing requires the path of a light beam to enclose an area, so that clockwise and counter-clockwise degeneracy is lifted by an inertial rotational rotation.
Abstract: The use of light in inertial rotation sensing requires the path of a light beam to enclose an area, so that clockwise and counter-clockwise degeneracy is lifted by an inertial rotation. This is presently done in laser gyros with carefully aligned mirrors. This paper reviews the way in which guided waves may be used to eliminate the use of carefully aligned mirrors and discrete optical components. The advantages of guided wave devices will be increased stability and rigidity, as well as potential decreased fabricational costs. Disadvantages are possible increases in scattering and absorption losses.
7 citations
13 Jul 1978
TL;DR: In this article, the basic interaction mechanisms, configurations, and key acoustical and optical parameters of noncollinear coplanar guided-wave acoustooptics and some of the more recent progress on application of the resulting devices are summarized.
Abstract: The fundamentals of noncollinear coplanar guided-wave acoustooptics and some of the more recent progress on application of the resulting devices are summarized in this paper. First, basic interaction mechanisms, configurations, and key acoustical and optical parameters are discussed. A number of wideband device configurations which employ isotropic/anisotropic Bragg diffractions and multiple surface acoustic waves together with the results obtained using optical waveguides in Y-cut LiNb03 substrate are then described. Finally, typical performance figures that have been obtained with applications using the resulting wideband devices, emphasizing those being carried out at the author's institution, including high-resolution light beam deflectors, very high-scanning rate light beam deflectors, spectrum analyzers, convolvers, pulse compressors, and tunable optical filters are given. Further improvements in performance figures as well as implementation of other types of signal processors are possible. These applications constitute some of the attractive ones in future wideband multichannel integrated/fiber optic communication and signal processing systems.© (1978) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
6 citations
TL;DR: In this paper, the surface acoustic wave is launched from a ZnO/Tab2O5/SiO2/Si multilayered structure, while a Ta2O 5/Si O2 2/Si optical waveguide is used for the acousto-optic interaction.
Abstract: Guided‐wave acousto‐optic diffraction has been demonstrated on a silicon substrate for the first time. The surface acoustic wave is launched from a ZnO/Tab2O5/SiO2/Si multilayered structure, while a Ta2O5/SiO2/Si optical waveguide is used for the acousto‐optic interaction. The measured diffraction efficiency is 3.3% per milliwatt of acoustic power. An order‐better performance is possible with improved transducer geometry. The silicon‐based guided‐wave acousto‐optic technology is preferred for eventual integration of both optical and electronic components for integrated optical applications such as rf spectrum analyzer and fiber‐optical terminals. Experiments with a similar structure on a glass substrate is also reported.
6 citations
TL;DR: In this paper, a two-dimensional optical refractive index pattern that can be written in and erased optically was proposed and demonstrated for programmable optical guided-wave devices, which utilizes the combination of three physical properties of bismuth silicon oxide (Bi 12 SiO 20 ) crystal: a large electrooptic effect, a strongly wavelength-dependent photoconductivity effect, and a high dark resistivity with long carrier trapping time.
Abstract: A new type of optical guided wave device, consisting of two-dimensional optical refractive-index patterns that can be written in and erased optically, is proposed and demonstrated. This programmable optical guided-wave device utilizes the combination of three physical properties of bismuth silicon oxide (Bi 12 SiO 20 ) crystal: a large electrooptic effect, a strongly wavelength-dependent photoconductivity effect, and a high dark resistivity with long carrier trapping time.
2 citations
TL;DR: In this article, the authors investigated the light emission of the guided wave modes via the grating coupling effect of modulated surfaces and found several modes with characteristic dispersions in the optical spectral range between 5750 and 4500 A.
1 citations