Abstract: The present invention relates to a Bragg grating filter optical waveguide device, comprising an optical fiber provided with a Bragg grating region which is externally strained to alter the range of chirping. The external strain is induced by a gradient-generating mechanical body bonded onto the length of the fiber grating.

Abstract: Methods of making a multiple-port optical device include precisely positioning pairs of optical fibers inside of a fiber ferrule using a positioning means, such as shaped capillaries or an external clamp, to hold the position of the fibers while adhesive is applied to the fibers and cured. The external precision positioning means comprise silicon wafers which are etched to form capillaries or guides for the fibers. Adhesive is applied to the fibers and wicked into the fiber ferrule capillary to completely fill the capillary. The external positioning means is removed after curing and the fiber ferrule is polished for use in optical devices such as multiple-port DWDM filter packages.

Abstract: A Raman fiber amplifier includes: a transmission fiber; at least one optical pump providing optical pump power to the transmission fiber; and at least one pump power detector; at least one signal detector detecting signal power propagating through the transmission fiber. The Raman fiber amplifier also includes a controller that adjusts the pump power provided by the pump to adjust, gain, or signal power provided by this Raman fiber amplifier.

Abstract: A Multi-mode Interferometric coupler comprising: a first amplifying part (2), a second transparent part (4) to guide radiation previously amplified in the first part.

Abstract: An optical switch and method of making in which a large number of optical elements, which may be diffractive or refractive, are formed within the plane of a wafer to transmit light approximately perpendicularly to the wafer plane. The optical elements are formed on separate deformable mechanical elements, such as a plate rotatable about two axes lying approximately parallel to the wafer plane. Electrical elements, such as capacitor plates with a free-space gap therebetween selectively deform the mechanical elements in a micro electromechanical system (MEMS) arrangement with the optical elements disposed upon the mechanical elements to separately control the directions in which the light beams are transmitted. The optical switches may be formed in an array, and two levels of such arrays formed in separate wafers which are bonded together allow two-stage switching of light through the assembled structure.

Abstract: Disclosed herein are a system and method for using a remote terminal to control processes executing on a client terminal by transmitting data to the client terminal emulating keystroke inputs at the client terminal. A remote control application program executing at the remote terminal initiates the transmission of a message for emulating keystroke inputs to the client terminal. The remote terminal also executes an operating system having logic for responding to a detection of any one combination of keystrokes of a set of predetermined combinations of keystrokes, independently of any application program executing on the remote terminal. While the remote control application is active, the remote terminal inhibits the operating system from responding to detected keystrokes and transmits a message to the client terminal emulating an input of the detected keystrokes at the client terminal.

Abstract: A high-speed external optical modulator formed on a lithium niobate substrate has a diffused optical waveguide, a surface buffer layer, and electrodes for applying modulating RF energy. The electrodes are electroplated in at least two steps, resulting in a top co-planar waveguide structure lying on a second one. Low driving voltage is achieved through selection of the width, position, and dimension of the lower hot and ground electrodes. The upper ground electrodes and, preferably, also the upper hot electrode, are narrower in width than the corresponding lower electrodes, which helps to provide good velocity matching, good impedance values, and low electrical losses.

Abstract: A device for comparing between N nominal wavelength values (&lgr;ei) and the wavelength values of optical signals coupled respectively with input ports (GEi) of a phasar with a grating (R) of guides (Gj), the said phasar comprising a main output port (GS (m) designed to collect the combination of the said signals, the said main output port (GS(m)) being placed at a focal point corresponding to a given interference order m of the grating, characterized in that the phasar comprises two secondary monitoring output ports (A, B) respectively placed in the vicinity of focal points corresponding to the interference orders m−1 and m+1 of the grating (R).

Abstract: The invention relates to an optical fiber amplifier device with an optical signal input and output with first piece of amplifying fiber doped with lanthanide in a double-clad structure, a second piece of amplifying fiber doped with lanthanide in a ring structure and lasers for pumping the two fiber pieces with at least one pump module.

Abstract: A temperature-stabilized optical amplifier (100) comprises at least an erbium-doped waveguide (101) for amplifying optical signals; at least a first and a second pump sources (103, 104) for generating respective pump beams at a first and, respectively, a second pump wavelength (&lgr;1, &lgr;2), said first and second pump wavelength being lower and, respectively, higher than 978 nm at an intermediate temperature of a predetermined range of temperature, and being subjected to drift as a consequence of temperature variations; and a pump distribution device (105), optically coupled to said pump sources for receiving said pump beams, and optically coupled to said at least an erbium-doped waveguide for feeding to said at least an erbium-doped waveguide a mixed pump radiation comprising at least a power fraction of each of said pump beams.

Abstract: The production of optical waveguides on waveguide bases which, for example, are formed from a correspondingly structured buffer layer, reduces the birefringence which occurs owing to thermally induced stresses during the glass production process. Therefore, the concentration of dopants (for example boron atoms) in the cladding layer can be reduced to achieve a birefringence-free optical component as complete adaptation of the thermal coefficient of expansion of the glass to that of the silicon substrate is no longer necessary. This has the enormous advantage that optical components, which comprise optical waveguides of this type, remain stable relative to external influences for a long time.

Abstract: A coplanar waveguide, which has parallel conductor strips that are arranged on a substrate and have an electrically insulating intermediate space between one another, wherein a material with a high dielectric constant is arranged on the conductor strips, on their side facing away from the substrate. In this way, it is possible to achieve a line section with a relatively small characteristic impedance.

Abstract: An amplifier including a first input for a first at least two input signals having mutually distinct wavelengths, a first output for a first at least two output signals, the first at least two output signals having said mutually distinct wavelengths, a first circulator including an input port coupled to the first input, an output port coupled to the first output, and an intermediate port coupled to a first end of a selective reflection circuit, and, a second circulator including an intermediate port coupled to a second end of the selective reflection circuit, an output port coupled to a first selective splitter, and an input port coupled to a second selective splitter, wherein the first selective splitter and the second selective splitter are centered about a first selected wavelength amongst the mutually distinct wavelengths.

Abstract: An amplifier system includes: (i) a distributed Raman fiber amplifier and; (ii) a discrete Raman fiber amplifier that includes dispersion compensated fiber. The discrete Raman fiber amplifier is operatively connected to the distributed Raman fiber amplifier and amplifies signals received from the distributed Raman fiber amplifier. In one embodiment, at least one source of pump signal is coupled to the distributed and to the discrete Raman fiber amplifier. The distributed Raman fiber amplifier and the discrete Raman fiber amplifier in this embodiment share optical pump power provided by the shared pump. In one embodiment of the present invention an Erbium doped fiber amplifier (EDFA) is operatively connected to a discrete Raman fiber amplifier and the Erbium dope fiber amplifier amplifies signals received from the discrete Raman fiber amplifier.

Abstract: An add-drop wavelength filter is described which separates specific wavelength components from optical signals propagating through an optical waveguide or adds specific wavelength components thereto. In general, add-drop wavelength filters serve to separate or add specific channels in channels comprising several different wavelengths in a wavelength division optical communication system, and require good wavelength selectivity, stability and etc. Up to now, several types of add-drop wavelength filters are proposed, however disadvantageously they were not stable or were difficult to fabricate. The add-drop wavelength filter of the present invention comprising a mode discrimination coupler, Bragg gratings in which mode conversion occurs and etc., utilizes mode conversion in a dual mode waveguide and has low loss and stability.

Abstract: The present invention relates to an optical fiber having a normalized frequency applicable to a broadband optical device, and to a broadband, polarization-independent, low-loss optical fiber device made by using the aforementioned optical fiber. The optical fiber of the present invention has a normalized frequency value V, structural parameters of which including a core radius, a core refractive index and a cladding refractive index are adjusted to minimize the beat dispersion between first and second modes in a predetermined frequency range. Various optical fiber devices may be achieved if the aforementioned optical fiber is used along with acoustic wave generating means and a mode dropper or a mode selective coupler.

Abstract: A method for supporting non-assignable signals during formal verification of a circuit design includes providing a propagation logic for non-assignable signals and identifying a relevant cone in a circuit design, where the relevant cone determined by a property to verify. The method also includes designating one or more signals in the circuit design as non-assignable signals and propagating within the relevant cone any of the designated one or more non-assignable signals using the propagation logic for non-assignable signals. The method further includes ensuring, if a counter-example disproving the property exists, that the counter-example does not comprise any of the one or more designated non-assignable signals. A formal verification system that supports the designation of non-assignable signals comprises a non-assignable signal truth table and a proof engine. The non-assignable signal truth table specifies a propagation logic for non-assignable signals.

Abstract: A method of fabricating a fused-type directional coupler that can be made in a simple manner. The present invention is characterized in that a pair of optical fibers satisfying a particular phase match condition are previously selected to form a fused-type directional coupler. The two optical fibers are prepared by respectively tapering and etching two identical optical fibers. The present invention can be applied to fabrication of mode-selective directional couplers utilizing symmetrical high-degree modes such as LP02 mode as well as fabrication of mode-selective directional couplers utilizing asymmetrical high-degree modes such as LP11 mode.

Abstract: An optical system for a scanning probe microscope provides both an optical on-axis view and an optical oblique view of the sample by means of two optical paths each providing an image to a CCD camera via an auto-zoom lens. A shutter alternately blocks the image of either view from reaching the auto-zoom lens. The CCD camera provides the optical image to a video display which also displays the scanning probe image, thus eliminating the need for eyepieces and allowing easy viewing of both the optical and scanning probe images simultaneously.

Abstract: Disclosed herein are a system and method for using a remote terminal to control processes executing on a client terminal by transmitting data to the client terminal emulating keystroke inputs at the client terminal. A remote control application program executing at the remote terminal initiates the transmission of a message for emulating keystroke inputs to the client terminal. The remote terminal also executes an operating system having logic for responding to a detection of any one combination of keystrokes of a set of predetermined combinations of keystrokes, independently of any application program executing on the remote terminal. While the remote control application is active, the remote terminal inhibits the operating system from responding to detected keystrokes and transmits a message to the client terminal emulating an input of the detected keystrokes at the client terminal.