Abstract: An optical modulator includes a substrate having an electrooptic effect, an optical waveguide having first and second cascading portions in the substrate, and transmitting an optical field, a first coplanar strip electrode having a first part over the first cascading portion and second and third parts extending beyond the first cascading portion, wherein the first part is approximately perpendicular to the second and third parts and has a width substantially the same as the first cascading portion, a second coplanar strip electrode having a first part over the second cascading portion and second and third parts to extend beyond the second cascading portion, and the first part being approximately perpendicular to the second and third parts, and a voltage source supplying a voltage to the first coplanar strip electrode, wherein the second coplanar strip electrode is grounded and is symmetrical to the first coplanar strip electrode.

Abstract: Switchable holographic optical elements (HOEs) can used in systems and methods for projecting three-dimensional images, or for projecting two-dimensional tiled images with increased size and/or resolution. One of the methods may include sequentially displaying first, second, and third color components of a first two-dimensional image at an object plane. The first two dimensional image represents a first slice of a three-dimensional image. As the first, second, and third color components are displayed, first, second and third HOEs may be activated so that the activated first switchable HOE focuses the first color component of the first two-dimensional image onto a first image plane, the activated second switchable HOE focuses the second color component of the first two-dimensional image onto the first image plane, and the wherein the activated third switchable HOE focuses the third color component of the first two-dimensional image onto the first image plane.

Abstract: A fiber optic lamp includes a lamp housing having a stem section with a passageway therein and a reflector section having a reflective surface. The lamp housing also has first and second circular ledges for receiving and holding in place at least one lens within the lamp housing. A fiber optic cable is provided having a first end for insertion into the passageway of the lamp housing for transmitting light. The second end of the fiber optic cable is connected to a light pump having a light source therein for generating and transmitting light through the fiber optic cable. The fiber optic cable is connected to a socket member of a fixture housing for mounting the stem section of the lamp housing in the fixture housing.

Abstract: An arrayed waveguide grating (AWG) wavelength division multiplexer (WDM) provided with alignment waveguides, and an apparatus for aligning the arrayed waveguide grating wavelength division multiplexer. The wavelength division multiplexer is provided with alignment waveguides, to be used upon coupling the optical waveguide device to optical fiber blocks, in addition to waveguides required for achievement of desired functions, so that it can achieve a desired alignment irrespective of the achievement of those functions. Accordingly, it is unnecessary to know respective operation characteristics of individual devices, thus easy and rapid alignment and bonding can be achieved. In accordance with the present invention, the operation wavelength of the optical wavelength device can be determined by detecting the wavelength of the light output from each alignment waveguide. Accordingly, it is possible to simply determine whether or not the optical waveguide device operates normally.

Abstract: The infrared absorption filter of the present invention has a transmittance of not higher than 30% in the near-infrared region in the wavelength range of 800 to 1100 nm; a difference of 10% or less between a maximum value and a minimum value of transmittance in the visible light region in the wavelength range of 450 to 650 nm; and a transmittance of not lower than 50% at a wavelength of 550 nm, the filter being so excellent in environmental stability that after being left to stand in the air atmosphere at a temperature of 60° C. and a humidity of 95% for 1000 hours, the filter can maintain said spectral property in said range. Consequently, when used for a plasma display or the like, the filter can absorb the unwanted infrared rays radiated from the display, resulting in preventing erroneous operation of a remote control using infrared radiation even in such a high-temperature and high-humidity environment.

Abstract: The present invention relates to a dispersion-compensating optical fiber which can transmit, with a low loss, light signals having a high power; and an optical transmission system including the same. This dispersion-compensating optical fiber is insured its single mode at a wavelength of 1.55 &mgr;m, and comprises, about the optical axis, at least a first core having a refractive index n1, a second core having a refractive index n2 (>n1), and a cladding having a refractive index n3 (<n2). Also, this dispersion-compensating optical fiber has a chromatic dispersion of −10 ps/nm/km or less at the wavelength of 1.55 &mgr;m, whereas the ratio 2a/2b of the outside diameter 2a of the first core with respect to the-outside diameter 2b of the second core is 0.05 or more.

Abstract: The optical loss filter according to the present invention is configured such that a first long-period grating and a second long-period grating are formed in cascade on a unitary optical fiber having a core region and a cladding region. A coating layer surrounding a part of the cladding region is provided between the first and second long-period gratings. The optical loss filter can be made smaller, and can easily realize a desirable loss characteristic.

Abstract: A diffraction optical element comprises a substrate, a diffraction grating formed on the substrate with a material with low ultraviolet resistance and an ultraviolet screening means arranged on the substrate at a position closer to the incident light receiving side of the optical element relative to the diffraction grating. The ultraviolet screening means comprises a dielectric multilayer film and is formed on the other side of the substrate than the side carrying the diffraction grating. Alternatively, the ultraviolet screening means may be provided as a separate member from a diffraction optical element and arranged at a position closer to the incident light receiving side of the diffraction optical element in an optical system.

Abstract: An external rearview mirror includes a holder for affixing the mirror to a motor vehicle. A carrier plate is located in a housing that is secured to the holder. At least one mirror assembly with a mirror pane is mounted pivotally on the carrier plate in the housing. At least one means of adjustment is mounted on the carrier plate and bound to the mirror assembly. A base plate is attached to the carrier plate, the base plate having a honeycomb structure with a multiplicity of cells on at least one side. The cells are integral and normal to the base plate and may vary in both height and diameter.

Abstract: An adjustable optical device including an optical element, a housing having an adjusting post fixed thereto, the optical element mounted to the housing, the housing adjusting post having a plane of movement, and an adjustment mechanism, the housing flexibly connected to the adjustment mechanism, the adjustment mechanism comprising a moving adjusting member in sliding engagement with the housing adjusting post, one of the adjusting member and the housing adjusting post comprising a wedge. The housing adjusting post is urged into movement in its plane of movement in response to relative movement between the adjusting member and the adjusting post, whereby the orientation of the optical element relative to the adjusting mechanism is adjusted by movement of the moving adjusting member.

Abstract: A ferrule is positioned on a ceramic package by a ferrule support member and is fixed between the ferrule support member and the ceramic package by an adhesive. On the side in the vicinity of one end of the ferrule, a groove is formed around the ferrule as an adherence enhancement.

Abstract: An optical fiber is composed of silica glass and comprises a center core region doped with F element, a ring core region doped with GeO2, and an inner cladding region doped with F element; wherein a buffer layer composed of undoped SiO2 or SiO2 doped with one or both of P and Cl or a concentration gradient region in which GeO2 concentration radially decreases toward the boundary is provided between the center core region and the ring core region.

Abstract: The optical transmitter/receiver apparatus of the invention includes: an optical fiber for transmitting/receiving an optical signal therethrough; and a first base including mutually spaced optical signal transmitting and receiving regions and a fiber end supporting region located between the optical signal transmitting and receiving regions. A semiconductor laser device for emitting the optical signal to be transmitted is secured to the optical signal transmitting region of the first base. A fiber end supporting portion for supporting one end of the optical fiber, to which the optical signal emitted from the semiconductor laser device is incident, is formed in the fiber end supporting region of the first base. A second base for supporting the body of the optical fiber is secured to the optical signal receiving region of the first base.

Abstract: An image recording device and an optical fiber are provided which can obtain scanned beam spots having configurations which extend in an elongated manner in a subscanning direction and which are rectangular, and which are suitably used for recording onto a heat-mode-type photosensitive recording material. The image recording device records an image by illuminating a light beam outputted from an exposure head which is connected to a semiconductor laser unit via an optical fiber. In the image recording device, the optical fiber is an optical fiber having a core whose cross-sectional configuration in a direction intersecting an optical axis of the light beam is an elongated and a rectangular configuration. An image is focused by a focusing lens such that a short width direction of a light beam emitted from a light exit portion of the optical fiber is oriented in a main scanning direction on a recording medium.

Abstract: An optical wiring device providing characteristics of optical connection leads while having substantially the same mountability as that of electrical wiring devices. According to the present invention, an optical axis of a photoelectric conversion element is made consistent with an optical axis of an optical terminal having a spherical shape through a tapered hole provided in a package substrate. An optical wiring substrate includes a concave portion attached to the package substrate with the optical terminal at the position of the concave portion. The optical terminal serves as a fitting part between the package substrate and the optical wiring substrate. By putting the focal point of the optical terminal within the optical wiring substrate, an optical wiring is not exposed to the external atmosphere.

Abstract: An optical filter comprises a transparent support and at least one filter layer. The optical filter has an absorption maximum in the wavelength region of 560 to 620 nm. The optical filter also has another absorption maximum in the wavelength region of 700 to 1,200 nm. A plasma display panel having a display surface covered with an optical filter is also disclosed.

Abstract: The specification describes a technique for evaluating optical fiber splices. The essence of the technique involves detecting thermal power emanating from the fiber splice as the result of absorption of the light carried by the fiber. The technique is particularly suited for cladding pumped lasers wherein the splicing operation may introduce excessive absorption of pump laser radiation and excessive heating at the splice locale.

Abstract: An optical fiber is disclosed having, at a wavelength of 1 550 nm, an effective core area not less than 100 &mgr;m2, a chromatic dispersion from 14 ps/(nm.km) to 21 ps/(nm.km) and good resistance to microcurvatures. The specifications of the fiber limit non-linear effects and provide sufficient transmitted power for transmission systems. A fiber optic transmission system using fiber of the above kind as line fiber is also disclosed.

Abstract: A reflection type optical device comprises a transparent base member having an incident light receiving surface, at least a reflection surface for internally reflecting the incident light and a light emitting surface for emitting the reflected light. A dielectric layer is formed on each of the incident light receiving surface and the light emitting surface, and a metal layer is formed on all the remaining surfaces of the transparent base member other than the incident light receiving surface and the light emitting surface.

Abstract: A number of holes (3) are formed in the outer circumferential wall (2) of a tubular metallic pipe (1) at regulator intervals in both circumferential and axial directions. Each of the holes (3) consists of a polygonal opening (4) and raised pieces (5) formed by bending the material from the peripheral edge surrounding the opening (3). This pipe may be used as an insert pipe in injection molding an article such as a lead screw, an optical fiber ferrule or the like. The raised pieces reinforce the part of the pipe surrounding each hole, and enhances the bonding between the molding material and insert pipe.