Abstract: A wavelength separator includes a one-dimensional photonic crystal structure formed by providing a plurality of grooves in parallel with one another at uniform intervals in a homogeneous medium, and has an incident end face formed obliquely with respect to a direction in which the grooves extend, and an output end face formed approximately perpendicular to the incident end face.

Abstract: Disclosed are an optical module interfacing device for connecting an RJ interface and an SFP type optical module to an SFP type optical module connector without additional processing, and an Ethernet system using the optical module interfacing device, thus supporting data transmission and reception. The optical module interfacing device includes a board having the same dimensions as those of the optical module, a male connector, having the same dimensions as those of the optical module, formed at a side surface of one end of the board to be connected to the female connector for the optical module mounted on a host board, and an RJ female connector provided with a plurality of pins formed on an upper surface of the board, respectively corresponding to pins of the male connector, according to standards. Further, UTP data is provided to MDI supporting ports of a physical layer through an interfacing unit.

Abstract: A micro-electro-mechanical (MEMs) mirror device for use in an optical switch is disclosed. A “piano”-style MEMs device includes an elongated platform pivotally mounted proximate the middle thereof by a torsional hinge. The middle portion of the platform and the torsional hinge have a combined width less than the width of the rest of the platform, whereby several of these “piano” MEMs devices can be positioned adjacent each other pivotally mounted about the same axis with only a relatively small air gap therebetween. In a preferred embodiment of the present invention electrostatic charges, which build up on exposed dielectric surfaces causing the mirror's angular position to drift over time, are minimized by positioning the hot and ground electrodes at different levels separated by a vertical surface, and placing the dielectric material on the vertical surface.

Abstract: A micro-electro-mechanical (MEMs) mirror device for use in an optical switch is disclosed. A “piano”-style MEMs device includes an elongated platform pivotally mounted proximate the middle thereof by a torsional hinge. The middle portion of the platform and the torsional hinge have a combined width less than the width of the rest of the platform, whereby several of these “piano” MEMs devices can be positioned adjacent each other pivotally mounted about the same axis with only a relatively small air gap therebetween. In a preferred embodiment of the present invention specially designed for wavelength switching applications, a greater range of arcuate motion for a mirror mounted thereon is provided by enabling the platform to rotate about two perpendicular axes.

Abstract: An improved waveguide shuttle optical switch design which provides the function of a variable optical attenuator (VOA). A small degree of intentional misalignment of the waveguide will create different levels of optical attenuation. By finely controlling the misalignment of a selected switched position, a single device may be realized that will provide the functions of both switching and attenuating or just attenuation alone. The optical MEMS device utilizes a latching mechanism in association with a thermal drive actuator for aligning a waveguide shuttle platform. The integration of the switching function and the VOA function reduce the optical loss which is otherwise unavoidable when the inevitable alternative of a separate switch and a separate VOA must necessarily be employed. The resultant improved device can also be applied for correcting the difference in optical intensity created by the manufacturing tolerances inherent in the fabrication of array waveguide gratings.

Abstract: An image pickup device according to the present invention comprises (1) a fiber optical plate constituted by bundling a plurality of optical fibers, including a core and a cladding covering an outer periphery thereof and having a light incident surface and a light-emitting surface inclined with respect to the optical axis direction of a plurality of optical fibers; (2) a plurality of columnar crystals having light permeability, formed on the light-emitting surface of the fiber optical plate; and (3) a solid-state image pickup device having photoelectric converters arrayed and formed in two-dimensional fashion on a main surface of a semiconductor substrate and optically coupled to a plurality of columnar crystals.

Abstract: An illumination device is described containing optical fibers that transmit electromagnetic energy from a source to a target. Additional optical fibers return reflected electromagnetic energy from the target. High-level electromagnetic energy can be used for cutting, reforming, or treating a surface. Low-level electromagnetic energy illuminates the surface.

Abstract: The invention provides optical waveguides comprising a glass doped with a rare earth dopant on a surface of the substrate, wherein the glass comprises (a) Al2O3, at least one of REO or Y2O3, and at least one of ZrO2 or HfO2, wherein at least 80 percent by weight of the glass collectively comprises the Al2O3, at least one of REO or Y2O3, and at least one of ZrO2 or HfO2, based on the total weight of the glass; (b) Al2O3, at least one of REO or Y2O3, and at least one of ZrO2 or HfO2, wherein at least 70 percent by weight of the glass collectively comprises the Al2O3, at least one of REO or Y2O3, and at least one of ZrO2 or HfO2, and wherein the glass contains not more than 20 percent by weight SiO2 and not more than 20 percent by weight B2O3, based on the total weight of the glass; or (c) at least 40 percent by weight Al2O3, based on the total weight of the glass, and a first metal oxide other than Al2O3, wherein the Al2O3 and the first metal oxide, collectively comprise at least 80 percent by weight of the gla

Abstract: An optical connection device includes: a substrate; an optical waveguide provided in the substrate; and plural optical connection ports provided in the optical waveguide and having at least one of a light output port and a light input port, the light output port outputting light to the optical waveguide, the light input port receiving light from the optical waveguide, and is characterized by further including an arithmetic circuit for, using a key, selectively decoding an optical signal which has been coded in such a manner that it is decoded only at a light input port that is given a key for decoding and which has been outputted from a light output port to the optical waveguide to be received at the light input port.

Abstract: In an optical element aimed at readily and accurately controlling a refractive index of an electrooptic effect film, and at making the device adaptive to further downsizing, a voltage control unit controls the refractive index of light in an optical waveguide between two values of a first voltage and a second voltage bounded at a predetermined voltage which corresponds to an anti-ferroelectric phase transition point, based on a fact that the refractive index of a core layer of the optical waveguide largely varies in a digital manner at the predetermined voltage, but is kept almost constant thereunder and thereabove.

Abstract: Small form factor package structures are disclosed for LiNbO3 optical modulator by reducing the package dimension for minimize the unused free space inside a modulator package. If a first aspect of the invention, the structure of the small form factor package for LiNbO3 optical modulator employs a metal round block having an inner part that is made of zirconia or glass like borosilicate BK7 or Pyrex and the outer part that is made with stainless steel or kovar. The inner and outer parts represent a two-pieces optical fiber assembly that are held together by a resin. In a second aspect of the invention, a surface of the lithium niobate chip is attached to a surface of the metal round block (or a glass block) that results in an angular positioning of the lithium niobate chip inside the optical package, which significantly reduces the mechanical stress induced by different polishing angle of the metal round block as well as the polishing angle of the lithium niobate chip.

Abstract: Disclosed is a PCB in which a waveguide is embedded, and a method of producing the same. The PCB includes a substrate, and a lower clad layer formed on the substrate through a predetermined process to allow an optical signal irradiated thereto to be total-reflected thereby. A core layer is formed on the lower clad layer through a predetermined process and exposed using an exposing film on which a waveguide pattern is formed to form the waveguide with a predetermined shape therefrom. Furthermore, an upper clad layer is formed on the core layer through a predetermined process to allow the optical signal irradiated thereto to be total-reflected thereby.

Abstract: An optical system 111 collimates wavelength components of wavelengths ?1-?3 emerging from an end face of optical fiber 11, a diffraction grating 121 separates them by wavelength, and an optical system 112 condenses them. The component of the wavelength ?1 is focused at a focus position by the optical system 112 and diverges after the focus position. Then the component of the wavelength ?1 is collimated by an optical system 113, travels via a diffraction grating 122, and is condensed by an optical system 114 to enter an end face of optical fiber 22. The component of the wavelengths ?2, ?3 condensed by the optical system 112 are reflected by reflecting portions 132, 133 set at their respective focus positions, are collimated by the optical system 112, travel via the diffraction grating 121, and are condensed by the optical system 111 to enter an end face of optical fiber.

Abstract: A nonlinear optical waveguide may be utilized, together with arrayed waveguide grating demultiplexer/multiplexer and thermo-optic phase shifters, to achieve pulse compression of optical pulses. In some embodiments, a relatively compact pulse compressor can be achieved based on integrated planar lightwave circuit.

Abstract: An optical switch device is disclosed that includes an optical system deflecting and outputting input light signals using deflector parts; resistor parts provided in corresponding routes for feeding driving signals output from drivers to the corresponding deflector parts; a signal generator part generating a DC signal and an AC signal and feeding the DC and AC signals to the deflector parts through the corresponding drivers and the corresponding resistors; a threshold generator part generating a first threshold and a second threshold corresponding to the DC and AC signals, respectively; a voltage detector part detecting a voltage across each of the resistor parts; and a failure detector part determining whether the deflector parts are normal or out of order based on the corresponding results of comparing the voltages detected by the voltage detector part with at least one of the first threshold and the second threshold.

Abstract: A method of modulating an optical carrier. A target carrier modulation is computed based on an input data signal. An effective length of an optical modulator is then controlled based on the target carrier modulation.

Abstract: An in-line, distributed optical fiber filter comprises a core region with a raised refractive index (with respect to the surrounding cladding material) so as to allow for total internal reflection (TIR) of the desired transmission wavelength(s). One or more raised index features are formed within the cladding region and are configured so as to result in mode mixing between the cladding mode and core mode at determined wavelength(s) to be removed by filtering. The parameters associated with determining the proper core specifications and cladding specifications can be separately determined to provide for enhanced performance in terms of both filtering unwanted signals and propagation of desired communication signals.

Abstract: The present invention relates a variable optical multiplexer/demultiplexer which can be made smaller and can restrain characteristics from deteriorating. The optical multiplexer/demultiplexer comprises a first optical system, a wavelength branching device, a second optical system, and an optical path changing part. The optical multiplexer/demultiplexer has a plurality of input/output ports, and the first optical system, the wavelength branching device, and the second optical system are disposed between the ports and the optical path changing part. When light is fed into any of the ports, individual wavelength components included in the light are outputted from any of the ports. The optical path changing part inputs the wavelength components condensed by the second optical system, and output the wavelength components to an output optical path which is parallel to but not on the same line as the input optical paths of the wavelength components.

Abstract: The spacers 3 and 4 and the recess is formed on the supporting substrate 2 to support the upper cladding layer 7. The intermediate surface 22 and 23 lower than the top surface of the spacers 3 and 4 and higher than the inner bottom surface of the recess is formed on the supporting substrate 2. Each of the height between the top surface of the spacers 3 and 4 and the intermediate surfaces 22 and 23, and the height between the intermediate surfaces 22 and 23 and the inner bottom surface of the recess of the second substrate 2 becomes thin compared with the total thickness of the lower cladding layer. Thus, when the resin for the lower cladding layer 9 is cured to shrinkage, the inner stress in the resin is dispersed and the occurrence of the wrinkle 12 and the void decreases.

Abstract: An architecture that enables one to realize a FIR transversal filter with apodized, interlaced bipolar tap coefficients (an). The tap coefficients, an, are varied via the control of the optical powers emitted by an array of WDM laser sources. Also, a filter architecture where tap coefficients can be agilely reconfigured in both polarity and magnitude. One chirped fiber-grating may be used to implement a series of wavelength-dependent tap-weights. The filter designs can be utilized to eliminate the low-pass response centered at DC, allowing one to place the center frequency (fc)1 of the first passband at a targeted intermediate frequency (IF).