| Patent Number |
Title Of Patent |
Date Issued |
| 6977986 |
Method and apparatus for aligning a crystalline substrate |
December 20, 2005 |
| The invention provides an apparatus (10, 300) incorporating a lithographic tool (20) for printing a pattern from a mask (35) onto a substrate, for example a wafer (190), together with a substrate angle measuring tool (100, 310) employing X-ray diffraction techniques for determining s |
| 6973232 |
Waveguide mode stripper for integrated optical components |
December 6, 2005 |
| Through the introduction of an imaging multimode interference device in an integrated optical circuit, such performance degradations as lateral waveguide field oscillations and backreflections may be suppressed. The suppression of lateral waveguide field oscillations (that may occur due |
| 6966703 |
Self eject latch mechanism for an optical transceiver module |
November 22, 2005 |
| An actuator-based latching/delatching mechanism in combination with an optical module includes a housing having a front face with an opening and an optical transceiver designed to be nestingly engaged in the opening. A front surface of the transceiver is flush with the face of the housin |
| 6956652 |
Optical autocorrelator |
October 18, 2005 |
| An optical autocorrelator comprises an optical waveguide (40) of semiconductor material which exhibits two photon absorption at a wavelength at which the autocorrelator is intended to operate. Reflecting means (46) are provided at a part of the waveguide which is remote to an end (42 |
| 6931333 |
Electrical power sensing |
August 16, 2005 |
| The RF power passing through a given position in a monolithic microwave integrated circuit (MMIC) is determined using the Seebeck effect. The MMIC includes at least certain components of a voltage creating circuit, including a first Seebeck junction on the MMIC at a given position and a |
| 6893162 |
System |
May 17, 2005 |
| A system (10) comprises a carrier (1) which is adapted to carry an optical fiber (9) and an optical chip (3) having a circuit element (4). The carrier and the optical chip are provided with co-operable alignment features (13,14) for aligning the carrier with the optical chip so that |
| 6891676 |
Tunable spectral filter |
May 10, 2005 |
| An optical spectral filtering device and associated method for selectively directing a portion of a wavelength multiplexed input signal, entering through an optical fiber, into one or more output signals provided to one or more optical fibers and/or electronic outputs. The optical filter |
| 6882758 |
Current tuned Mach-Zehnder optical attenuator |
April 19, 2005 |
| A current tuned optical attenuator includes a Mach-Zehnder interferometer that relies on the creation of free carriers to create a phase difference in an optical signals along two waveguide arms. |
| 6870968 |
Optical signal time-scaling arrangement |
March 22, 2005 |
| A signal time-scaling arrangement utilises a known configuration comprising the use of a laser which has its wavelength varied over time, a modulator coupled to the laser and to a modulating analogue electrical source and a dispersion means coupled to the output of the modulator and prov |
| 6862300 |
High power semiconductor laser diode and method for making such a diode |
March 1, 2005 |
| Semiconductor laser diodes, particularly high power ridge waveguide laser diodes, are often used in opto-electronics as so-called pump laser diodes for fiber amplifiers in optical communication lines. To provide the desired high power output and stability of such a laser diode and avoid |
| 6853775 |
Semiconductor optical waveguide device |
February 8, 2005 |
| A device comprises a tapered semiconductor optical waveguide which tapers, at an angle of taper with respect to a longitudinal axis of the waveguide, from a relatively wide region to a relatively narrow region, wherein the angle of taper varies along the length of the tapered waveguide s |
| 6837075 |
Glass fiber fixative and fixing process |
January 4, 2005 |
| A glass fixative composition for bonding glass materials to non-glass materials is provided. The fixative composition is selected for its thermal expansion coefficient, its viscosity, its adhesion to glass, melting point, and bond strength. The glass fixative is in particular useful |
| 6829275 |
Hybrid confinement layers of buried heterostructure semiconductor laser |
December 7, 2004 |
| A semiconductor device such as a buried heterostructure semiconductor laser includes a semiconductor substrate supporting an active region comprised of a multiple quantum well active region and confinement layers having defined gratings and grating overgrowth regions to produce a laser d |
| 6826331 |
Method of extracting spectral parameters of channels from non-channelized light |
November 30, 2004 |
| A method of assembly is presented for a multi-wavelength optical monitor (MWOM) for use in fibre optic telecommunication networks. The method allows coarse optimisation to be used to align an input optical fibre and detector array relative to a wavelength division demultiplexing element. |
| 6819877 |
Optical links |
November 16, 2004 |
| An optical link is operative for transmitting a microwave signal in modulated optical form over an optical fiber. The optical link has a transmitter and a receiver. The transmitter splits and converts the microwave signal into two separate optical signals, each of which represents ei |
| 6819702 |
Pump laser diode with improved wavelength stability |
November 16, 2004 |
| A pump laser diode for providing improved stability at various operating temperatures is disclosed. It includes a Fabry-Perot cavity formed by laser facets. Bragg Gratings or Fiber Bragg Gratings (FBG) in a pump module are provided, wherein the optical mirror losses are made to incre |
| 6816638 |
Strain sensing |
November 9, 2004 |
| A strain sensor comprises an optical waveguide having a plurality of reflecting structure (Bragg grating) along its length. Each structure reflects light at a different characteristic wavelength (.lambda..sub.1 to .lambda..sub.n+1) which changes in dependence on a change of physical |
| 6803520 |
High speed to-package external interface |
October 12, 2004 |
| An optoelectronic package includes a supporting structure with a surface, an opposed surface, and at least one side, at least one conductive interconnect extending through the supporting structure from the surface to the opposed surface of the supporting structure, wherein the at least |
| 6798815 |
High power semiconductor laser diode and method for making such a diode |
September 28, 2004 |
| Semiconductor laser diodes, particularly high power ridge waveguide laser diodes, are often used in opto-electronics as so-called pump laser diodes for fiber amplifiers in optical communication lines. To provide the desired high power output and stability of such a laser diode and avoid |
| 6798553 |
Optical filter elements and methods of making and using same |
September 28, 2004 |
| Optical filter elements and optical systems comprise optically mismatched etalons and optically mismatched stacked, optically coupled etalons that are directly optically coupled, at least one of the etalons or stacked, optically coupled etalons comprising first and second selectively |
| 6782024 |
High power semiconductor laser diode |
August 24, 2004 |
| Semiconductor laser diodes, particularly high power AlGaAs-based ridge-waveguide laser diodes, are often used in opto-electronics as so-called pump laser diodes for fiber amplifiers in optical communication lines. To provide the desired high power output and stability of such a laser |
| 6771687 |
Stabilized laser source |
August 3, 2004 |
| The invention relates to the stabilization of semiconductor laser diode sources as they are extensively used in the field of optical communication. Such lasers are mostly employed as so-called pump laser sources for fiber amplifiers, e.g. Erbium-doped fiber amplifiers, and are design |
| 6757097 |
Wavelength dependent isolator |
June 29, 2004 |
| A wavelength dependent optical device comprising: at least two optical Ports (21, 22); a first series of polarisation modifying optical components (23, 25, 27, 28) placed between the two Ports and a first dielectric mirror (29); the first dielectric mirror (29) operating substantiall |
| 6738556 |
Supporting structure for optical fiber fixing and submicron fine alignment |
May 18, 2004 |
| The invention relates to a clip for holding an optical fiber which is enclosed in a fiber support tube, with respect to an optical source. The clip provides a rigid front part and a flexible back part in one single structure. This specific structure allows fixing and precise adjustment o |
| 6724795 |
Semiconductor laser |
April 20, 2004 |
| A semiconductor laser adapted for telecommunications applications. The opitical mode delivered by the laser has a high power output beam and a narrow far field, thus, enabling efficient coupling of the laser into small numerical aperture optical fibers. The laser is made up of a semi |
| 6717708 |
Re-circulating optical pulse generator |
April 6, 2004 |
| A Mach-Zehnder Modulator (MZM) pulse generator is provided having an increased power output. Power carved from the output signal in creating the pulses is recycled back to the input of the pulse generator via a feedback arm. Careful design of the length of the feedback arm such that a |
| 6714574 |
Monolithically integrated optically-pumped edge-emitting semiconductor laser |
March 30, 2004 |
| The invention features an edge-emitting semiconductor signal laser having an active region to produce laser light. There is provided a semiconductor pump laser monolithically integrated with the edge-emitting signal laser. The pump laser includes a photon emissive active region to provid |
| 6661567 |
Optical amplifier, optical amplifier hybrid assembly and method of manufacture |
December 9, 2003 |
| An optical amplifier is provided from a body 21, at least part 25 of which is doped with a rare earth such as erbium. At least one waveguide 47 extends through the doped part of the body. Pump light 51 is input on a side face 35 of the body and is distributed in the body over the length |
| 6654534 |
Electrode, termination for reduced local heating in an optical device |
November 25, 2003 |
| An optical device, such as an electro-absorption modulator, has a waveguide formed onto a base. Electrodes adjacent the waveguide are used to selectively apply an electric field to the device in order to control the passage of light through the device. To prevent overheating of the devic |
| 6653213 |
Structure and method for doping of III-V compounds |
November 25, 2003 |
| A structure for doping of III-V compounds is provided. The structure is a multi-layered structure in which layers of dopant are alternated with layers of initially undoped III-V compound. Dopant diffuses from the layers of dopant into the layers of III-V compound. The structure does not |
| 6650673 |
Generation of short optical pulses using strongly complex coupled DFB lasers |
November 18, 2003 |
| A compact source capable of generating continuously tunable high frequency microwave radiation and short optical pulses in the picosecond/sub-picosecond range is invented. It includes a laser structure having two lasers formed on the same substrate which simultaneously operate at dif |
| 6650458 |
Electro-optic modulator with continuously adjustable chirp |
November 18, 2003 |
| An electro-optic modulator having a continuously adjustable chirp is provided. Optical signals input into the electro-optic modulator are divided into portions which are phase modulated in opposite senses, one portion imparted with a positive chirp and the other with a negative chirp |
| 6635405 |
Print quality test structure for lithographic device manufacturing |
October 21, 2003 |
| Disclosed is a print quality test structure for devices manufactured by lithography. The test structure allows for visual inspection of the print quality of the device. The test structure decouples the effects of overexposure, underexposure and focus so that corrections can be made for |
| 6629784 |
Waveguides to photodetector assembly |
October 7, 2003 |
| An assembly for combining the outputs from a group of n single mode optical fibres on to the photosensitive surface of a photodetector (1) has an adiabatically tapered bundle (2) of fibres (3) the small end of which is fusion spliced to one end of a length (4) of multimode fibre whose ot |
| 6628853 |
Optical amplifiers |
September 30, 2003 |
| An optical amplifier is constituted by a planar waveguide having an optical core intersected by a transverse trench occupied by a polymeric optically amplifying medium. An optical pump for the amplifier is provided by a laser diode positioned to direct its emission, transversely with res |
| 6628852 |
Isolation device |
September 30, 2003 |
| An isolation device that can be used for providing optical and electrical isolation between areas of an integrated chip. The isolation device includes three doped elongate regions which form diodes which can be connected in series. The isolation device can be used in optical devices |
| 6597852 |
Controlling birefringence in an optical waveguide |
July 22, 2003 |
| A method of controlling birefringence in a rib waveguide structure manufactured in silicon is describes. The rib waveguide structure comprises an elongated rib element having an upper face and two side faces. According to the method, a blanket layer of silicon nitride is formed to a |
| 6584239 |
Electro optic modulator |
June 24, 2003 |
| A doped slab region is described for use around a ridge waveguide, for controlling the refractive index of the waveguide material. Instead of simply diffusing dopant in from a surface of the slab region adjacent the waveguide, an area of the slab region is etched and dopant diffused in |
| 6560393 |
Dispersive optical waveguide array |
May 6, 2003 |
| A dispersive optical waveguide array comprises a plurality of waveguide sections forming optical paths in parallel, each of the curved sections having the same curvature and the same section length around the curve. |
| 6556759 |
Integrated optical device |
April 29, 2003 |
| A rib waveguide structure comprising a layer (4) of light conductive material defined between two planar faces with a rib (9) formed on one of the faces and an optical component e.g. a tapered waveguide (6) optically coupled to the other face. An inverted rib waveguide comprising a light |
| 6556599 |
External cavity laser using angle-tuned filter and method of making same |
April 29, 2003 |
| An external cavity laser comprises a light source unit, preferably comprising a semiconductor light source having internal optical gain and a collimating lens, for supplying substantially collimated light to a retroreflector via an angle-tuned filter extending across an optical axis |
| 6556343 |
Optical fiber device |
April 29, 2003 |
| An optical fiber amplifier or laser comprises an optical housing having a diffusive reflective inner surface and at least one opening for receiving pump light. An optical fiber having a doped core is at least partially contained within the optical housing. The optical fiber can be pumped |
| 6551936 |
Method of etching patterns into epitaxial material |
April 22, 2003 |
| An improved method for etching a pattern in a semiconductor material is based on the formation of an InP grating mask on the semiconductor material. The formation of the InP grating mask involves the formation of a multi-layered structure on the semiconductor material with an etch-stop |
| 6525550 |
Method and apparatus for temperature control |
February 25, 2003 |
| A two-stage circuit configured to control the temperature of a device, having: a first stage connected to the device for controlling the temperature of the device; and a second stage having a temperature sensor and a heat source associated with the first stage for controlling the tem |
| 6519270 |
Compound cavity reflection modulation laser system |
February 11, 2003 |
| The invention relates to compound cavity optical reflection modulation laser system providing frequency modulation of laser light by phase induced effective reflection modulation of the laser rear facet. The system includes a single mode gain coupled DFB laser integrated with a passi |
| 6517997 |
Production of an integrated optical device |
February 11, 2003 |
| A method of manufacturing an integrated optical device on a substrate is described wherein the device comprises first and second areas each containing at least one optical component. The first and second areas are separated by a third relatively featureless area, which provides optical |
| 6516120 |
Rib waveguide device with mode filter |
February 4, 2003 |
| A silicon rib waveguide device includes a mode filter section serially connected to a curved rib section. The curved section has a width large enough to support multimode transmission while the filter section has a straight waveguide of smaller rib width supporting only single mode t |
| 6510258 |
Integrated chip optical devices |
January 21, 2003 |
| A method of forming an integrated chip optical device as a protective layer formed over part of the face of the chip on which at least one optical waveguide is formed, and the protective coating is selectively removed leaving the coating over an edge region 18 and the edge of the device |
| 6509139 |
Method of fabricating an integrated optical component |
January 21, 2003 |
| A method of fabricating an integrated optical component on a silicon-on insulator chip comprising a silicon layer (1) separated from a substrate (2) by an insulating layer (3), the component having a first set of features, eg a rib waveguide (5) at a first level in the silicon layer (1) |
| 6441366 |
Sealed fiber optic gyroscope assembly |
August 27, 2002 |
| An hermetically sealed fiber optic gyroscope assembly has loops of optic fiber on a support ring in a sealed casing comprising a base plate, a perimeter wall upstanding from the base plate and a cover secured to the perimeter of the wall, together with optical circuitry located within th |
