Abstract: Disclosed herein is an integrated optical sub-assembly for a diplexer, which can adopt a low-price small aperture isolator by disposing an isolator closer to a ferrule, such that the isolator may be distanced from a laser diode, and so the total cost can be reduced and the construction can be simplified; and an integrated optical sub-assembly for a triplexer, which has simplified construction for reducing the manufacturing costs, and whose exterior dimension can be reduced and the manufacturing can be easier by adopting a ball lens for narrowing the beam width.

Abstract: Disclosed herein is an integrated optical sub-assembly for a diplexer, which can adopt a low-price small aperture isolator by disposing an isolator closer to a ferrule, such that the isolator may be distanced from a laser diode, and so the total cost can be reduced and the construction can be simplified; and an integrated optical sub-assembly for a triplexer, which has simplified construction for reducing the manufacturing costs, and whose exterior dimension can be reduced and the manufacturing can be easier by adopting a ball lens for narrowing the beam width.

Abstract: A bias voltage stabilizing method for an electricity-optical modulator based on an off-level sampling is disclosed.

Abstract: An electro-optic polymer waveguide device capable of decreasing a driving voltage and an optical loss is disclosed. A vertical tapered waveguide is formed between passive waveguides of input and output portions in a waveguide and an electro-optic modulating region, and an amplitude of a waveguide mode of the input and output portion waveguide is equal to that of a optical fiber, thereby minimizing a connection loss with the optical fiber.

Abstract: A spatial switch of a simple structure using a "M.times.N" optical beam steering device which operates with M "1.times.N" spatial switches using a phased optical waveguide array. The spatial switch using an optical beam steering device in accordance with the present invention is characterized in that the optical beam steering device includes an optical waveguide phase modulator array, the optical beam steering device is used as a "1.times.N" spatial switch device, and M units of the "1.times.N" spatial switch device are aligned in parallel so that a "M.times.N" spatial switching operation is performed on a plane where a far field diffraction pattern of the "1.times.N" spatial switch device is formed. The spatial switch utilizes the characteristics that if the propagation directions of the lights output from "1.times.N" switches coincide with each other, the far field diffraction patterns formed by the switches converge into the same point.

Abstract: An optical waveguide polarizer having a transverse electric wave pass mode. The waveguide polarizer includes an upper cladding layer, a core layer, and a lower cladding layer arranged in a vertically stacked relationship. The core layer includes an electro-optic polymer. The waveguide polarizer has a plurality of electrodes disposed on the upper and lower cladding layers and along both sides of a longitudinal region in the core layer such that the plurality of electrodes form electric fields in a direction substantially perpendicular to the core layer and along both sides of the longitudinal region so that a transverse electric wave mode is guided through the longitudinal region and a transverse magnetic wave mode is substantially extinguished in the longitudinal region.

Abstract: An improved waveguide polymer electro-optic modulator/switch which is operated in a single mode and has an improved device characteristic compared to the optimized modulator/switch and is capable of enhancing a coupling efficiency with an optical fiber without an increase of the driving voltage, which includes a waveguide formed in one line, a signal electrode formed at an upped input side of the waveguide, to which signal electrode a signal voltage is applied as an upper electrode, and an absorption electrode formed at an upper portion of the waveguide for absorbing a higher order which are not easily absorbed by the signal electrode and for increasing a dissipation ratio.

Abstract: A method for fabricating multi-layer polymer thin film of an electro-optical device which has a qualified multi-layer by using photobleaching characteristics of polymer. A proper time of photobleaching only changes the chemical, mechanical and electrical characteristics of the surface of the thin film without having any influence on characteristics of the device, so that when the multi-layer thin film are formed, such a cracking due to a solvent or melting, cracking due to the difference of mechanical tensile strength between each layer can be prevented, thereby obtaining a clean multi-layer thin film.

Abstract: The invention is related to an improved mach-zehnder type electro-optic polymer modulator which is capable of controlling its initial output state by post-photobleaching method, thus achieving a more stable output characteristic of a device without use of a bias electrode, which includes first and second electrodes formed on an upper portion of first and second arms have different lengths wherein a mach-zehnder type electro-optic polymer modulator.

Abstract: Disclosed is an electroluminescence light-emitting device for generating an optical wavelength, comprises a substrate; an ITO layer coated on the substrate, at lest two light-emitting layers sequentially formed on the ITO layer and having a different band gap, and a metal electrode formed on an upper light-emitting layer of the at least two light-emitting layers, wherein the ITO layer is used as an anode and the metal electrode is used as a cathode.

Abstract: An optical waveguide intensity modulator of a polymer waveguide utilizes and electro-optic effect and optical birefringence induced from a poling process of a nonlinear polymer thin-film. The optical waveguide intensity modulator is constructed by a series combination of a TE/TM mode selector, a TE or TM mode converter and another TE or TM mode selector. In the polymer waveguide, the mode selectors and mode converter can be easily obtained by making the direction of a poling field to be horizontal (or vertical) and approximately 45.degree. direction. According to the present invention, the optical waveguide intensity modulator is formed by integrating the TE or TM mode selectors and the TE or TM mode converter onto a single substrate. Further, because no element, is required which results in optical loses for example an optical isolator, an optical coupler or a curved portion of the waveguide, the efficiency of the device can be improved.