Abstract: An optical fiber 1 comprising a glass portion 2 having a core 2a and a cladding 2b, and one or more covering layers 3 formed around the glass portion 2, in which an arrangement form of the covering layer 3 with respect to the glass portion 2 in cross section perpendicular to a longitudinal direction thereof is changed continuously in the longitudinal direction thereof.

Abstract: An optical fiber cable termination apparatus for use with an optical fiber cable including a plurality of optical fibers includes at least one optical fiber enclosure assembly. Each optical fiber enclosure assembly includes a housing member and a cover member. The housing member defines an interior cavity and includes: a fiber entrance port in communication with the interior cavity to receive the optical fibers therethrough; a fiber exit port in communication with the interior cavity to receive the optical fibers therethrough; at least one connector port in communication with the interior cavity to receive an optical fiber connector; an access opening in communication with the interior cavity; and a first set of screw threads. The cover member includes a second set of screw threads and is mounted on the housing member by engaging the second set of screw threads with the first set of screw threads and rotating the cover member relative to the housing member.

Abstract: The present invention relates to a fiber having a core of crystal fiber doped with chromium and a glass cladding. The fiber has a gain bandwidth of more than 300 nm including 1.3 mm to 1.6 mm in optical communication, and can be used as light source, optical amplifier and tunable laser when being applied for optical fiber communication. The present invention also relates to a method of making the fiber. First, a chromium doped crystal fiber is grown by laser-heated pedestal growth (LHPG). Then, the crystal fiber is cladded with a glass cladding by codrawing laser-heated pedestal growth (CDLHPG). Because it is a high temperature manufacture process, the cladding manufactured by this method is denser than that by evaporation technique, and can endure relative high damage threshold power for the pumping light.

Abstract: The present invention concerns a method for displaying advertisements including the steps of providing at least one non-transparent cable for transmitting light in which an end of each non-transparent cable is received by a receiving structure and transmitting light selected from a plurality of colors along the non-transparent cables such that the light is emitted from the ends of the non-transparent cables received by the receiving structure. The emitted light forms a display in accordance with at least one of a pre-programmed design, and the display is an advertisement or a simulated floor covering. The non-transparent cable can be a fiber optic cable, and the method can further include the step of incorporating the receiving structure into an infrastructure. As an example, the infrastructure can be a travel way that supports at least one of vehicular traffic and pedestrian traffic.

Abstract: An optical element of the present invention includes a structure having at least one convex portion and at least one concave portion formed so as to be adjacent to either one of the convex portions. At least one surface of the structure is covered, and the optical element has a hollow portion. At least one surface of the structure is covered with a covering layer formed by a deposition process.

Abstract: A new method to form a VLSI-photonic heterogeneous system device is achieved. The method comprises providing an optical substrate comprising at least one passive optical component formed therein. An electronic substrate is provided comprising at least one active electronic component formed therein. A plurality of metal pillars are formed through the optical substrate and protruding out a first surface of the optical substrate. A plurality of metal pads are formed on a first surface of the electronic substrate. The optical substrate and the electronic substrate are bonding together by a method further comprising aligning the first surfaces of the optical and electronic substrates such that the protruding metal pillars contact the metal pads. The optical and electronic substrates are then thermally treated such that the metal pillars bond to the metal pads.

Abstract: A reconfigurable optical add/drop multiplexer (ROADM) includes a first optical dynamic gain equalization filter (DGEF) having a first input for receiving an initial wavelength division multiplexed (WDM) signal, a first output for sending a phase shifted WDM signal, and a second output connected to a demultiplexer for demultiplexing a WDM drop signal thereby producing a plurality of drop channels. A second DGEF having a first input for receiving the phase shifted WDM signal, a second input connected to a multiplexer, for multiplexing a plurality of add channels to produce thereby a wavelength division multiplexed (WDM) add signal, and an output for sending a second adjusted WDM signal. The ROADM allows for the channels from the initial WDM signal to be dropped, added and equalized.

Abstract: An asymmetric twin waveguide (ATG) structure with an integrated amplifier and detector fabricated in a single active waveguide layer is disclosed. The structure comprises an active waveguide layer formed on a passive waveguide layer. The active and passive waveguides have different effective indices of refraction such that a first mode of light is confined primarily to the active waveguide and a second mode of light is confined primarily to the passive waveguide in the area where the waveguides overlap.

Abstract: To provide a wavelength-selection optical switch able to select a light with a certain wavelength and an optical add/drop multiplexer using the same. An optical switch comprising: a silicon substrate; a glass substrate arranged to face a surface of the silicon substrate and having a transparent electrode layer in its opposing surface; a light diffraction reflection layer aligned on a surface of the silicon substrate; a liquid crystal layer aligned between the light diffraction reflection layer and the transparent electrode layer; a silicon substrate electrical terminal extracted from a rear surface of the silicon substrate; and a means for applying voltage between the transparent electrode layer and the silicon substrate electrical terminal; wherein selection of wavelength of light diffracted and reflected by the light diffraction reflection layer is possible by controlling the refraction index of the liquid crystal layer through the voltage.

Abstract: The invention provides an optical waveguide material whose refractive index can be tailored without changing the ratio of Ta and Nb. An optical waveguide of this invention comprising an under-clad layer 1 and a core 2 that is formed on the under-clad layer 1 and has a higher refractive index than that of the under-clad layer 1 is shown. For example, KTN (KTa1-xNbxO3) is used as the core 2, and a material that is obtained by substituting at least one element selected from the group consisting of Zr, Hf, and Sn for a portion of one element of the constituent elements of KTN and has the same perovskite type crystal structure as KTN is used as the clad. The refractive index of KTN can be reduced considerably, and this controllability widens the degree of freedom in the design of optical waveguide devices.

Abstract: The invention is a protective enclosure that can be adapted for use with different types of connectors, including LC type fiber optic connectors. The protective enclosure includes a plug portion and an adapter portion. The plug portion includes a plug housing having an internal longitudinal bore adapted to accept a plug connector of a connector type larger than an LC adapter, but includes a clip to which one or two LC plug connectors can be fixedly mounted that can optionally fixedly clip into the internal bore of the housing so that an LC connector can be fixedly mounted within the housing. The adapter portion includes an adapter housing having an internal longitudinal bore adapted to accept an adapter connector of a connector type larger than an LC adapter, but including an optional sleeve that can fixedly snap into the internal bore of the adapter housing and within which an LC adapter connector can be fixedly mounted.

Abstract: A two-dimensional photonic crystal slab having a photonic band gap common to a light beam in the TE-like mode and a light beam in the TM-like mode includes a slab member containing a high refractive index material and low refractive index sectors, arranged in the slab member in a triangular pattern, having a triangular prism shape. The two-dimensional photonic crystal slab further includes a linear defect section that is a disordered portion in a periodic structure of a photonic crystal and extends in the ?-J direction. Light beams in the TE-like mode and light beams in the TM-like mode can be propagated through the waveguide section. A two-dimensional photonic crystal waveguide includes the two-dimensional photonic crystal slab.

Abstract: A method of fabricating a planar lightwave circuit (PLC) having an optical waveguide includes the steps of: (b) forming an initial optical waveguide having a predetermined pattern, which is a transmission medium of light, on a substrate; and (c) reflowing the optical waveguide by applying heat thereto.

Abstract: The device includes an indexing adapter, two port monitors, a light source, and two fiber optic connectors. The indexing adapter has only three fiber optic connector receptacles. Two of the three fiber optic connector receptacles are situated adjacent to the third fiber optic connector receptacle. The third or center fiber optic connector receptacle separates the other two fiber optic connector receptacles from being positioned adjacent to one another. The center fiber optic connector receptacle is optically associated with the light source. Each of the other two fiber optic connector receptacles is respectively associated with one of the two port monitors. Each of the two fiber optic connectors includes only one optical fiber. The two fiber optic connectors are mechanically associated with one another.

Abstract: Embodiments of the present invention are directed to a modular optical device with a component insert for sending and/or receiving optical signals. A first fabricated package includes a light source for generating optical signals and/or a light detector for detecting received optical signals. A second fabricated package includes an opening for accepting circuitry. A lead frame mechanically connects the first fabricated package to the second fabricated package and electrically connects the light source and/or the light detector in the first fabricated package to contacts exposed in the opening of the second fabricated package. A component insert is mechanically coupled to the second fabricated package and electrically coupled to the exposed contacts for electrical interoperation with the light source and/or the light detector to transfer optical signals. The modular optical device can be coupled to a substrate configured to be received within a standard host system slot.

Abstract: An optical-electrical interface for interfacing optical signals with electrical signals. The optical-electrical interface includes an alignment interface for receiving an external waveguide connector from a first side. The alignment interface includes an alignment structure to mate with a corresponding alignment structure of the external waveguide connector to passively align the external waveguide connector. A first microlens is disposed on the first side of the alignment interface. A second microlens is disposed on a second side of the alignment interface. An optical path passes through the alignment interface between the first microlens and the second microlens. A conductor is disposed on the second side of the alignment interface.

Abstract: An optical module for housing an optical component to which optical fibers are to be connected, the optical module comprises a casing; at least two round fiber guides which are arranged within the casing, spaced at a distant from each other and around which the optical fibers can be wound; an accommodating space between the two round fiber guides for accommodating the optical component; and at least one opening provided in the casing and being arranged adjacent to one of the round fiber guides for external connections to be made.

Abstract: An LSI package having an optical interface is mounted on a surface of a photoelectric wiring board. The photoelectric wiring board and the optical interface are optically connected with sufficient precision. A wiring board side guide member including socket pins and guide pins is soldered and fixed onto the photoelectric wiring board including an optical transmission line, a guide pin, and a mirror. An optical interface side guide member having a fitting hole is glued to the optical interface. The optical interface is mounted on an interposer of the LSI package. The guide pin of the photoelectric wiring board is fitted into the fitting hole formed through the interposer. The guide pin of the guide member is fitted into the fitting hole of the guide member. As a result, position alignment between the optical interface and the photoelectric wiring board is conducted with high precision.

Abstract: Disclosed is a color optical link using a transparently jacketed plastic optical fiber that optically transmits data and uses light, scattered and emitted to the outside, for the purpose of illumination, and a method for achieving the color optical link. The color optical link includes a first driver that receives digital or analog signals and a coloring signal in parallel and converts these signals into optical signals through a plurality of light sources. These light sources emit light of different wavelengths. A first POF coupler, connected at one end of the optical fiber, inputs the received optical signals into the optical fiber. A second POF coupler at the other end separates the transmitted optical signals into a plurality of optical signals and inputs these optical signals into a plurality of optical detectors having filters for separating the received signals into plural signals according to wavelength. A second driver converts the received optical signals into electrical signals.

Abstract: A semiconductor waveguide includes a section containing free charge, either electrons or holes, which can be steered into or removed from the path of the beam under the control of electrical signals. The mobile charges come from a potential well which may be either filled or depleted under electrical control. When the well is filled, the charges speed the beam propagation, introducing a phase change. When the well is emptied the beam propagates with extra delay. The phase shifter allows very high speed modulation of the beam using low voltage and low power electronics. The device can be created using standard silicon processing techniques, and integrated with other optical components such as splitters and combiners to create amplitude modulators, attenuators and other optical devices.