| Patent Number |
Title Of Patent |
Date Issued |
| 7394838 |
Control for a tunable laser |
July 1, 2008 |
| A control (20) and a method of controlling a tunable laser having a gain section (4), a phase change section (5) and a segmented Bragg grating reflector section (6) comprising a series of grating units (9-17) each of a different pitch, and an electrode (9a-17a) associated with each grati |
| 7388890 |
Piezoelectric-tuned external cavity laser |
June 17, 2008 |
| A tunable laser comprising: a foundation including a first side and an oppositely facing second side and including a hole extending from the first side to the second side; a tuning assembly including a base, a fine tuning arm and a rotational flex bearing disposed adjacent the first side |
| 7365665 |
Photodiode digitizer with fast gain switching |
April 29, 2008 |
| An optical receiver and method of operating therfor. A photodiode converts a received optical signal to an electrical signal, which is provided to both high gain and low gain signal paths. First analog-to-digital converter ADC) circuitry is coupled to convert a high gain output signal |
| 7330657 |
Method to demultiplex wavelengths of light |
February 12, 2008 |
| An apparatus and method for demultiplexing multiple wavelengths of light. In one embodiment, an optical signal having a plurality of wavelengths is provided to an optical-to-electrical (OE) circuit configured to convert optical signals into electrical signals. The optical signal may incl |
| 7330633 |
Three constraint joint |
February 12, 2008 |
| A precision apparatus (10) includes a constraint joint (256) having a contact (258A) and a contact engager (258B). The contact (258A) includes a contact region (268) that is rounded, and the contact engager (258B) includes a first wall (270A), a second wall (270B), and a third wall ( |
| 7327961 |
Differential encoder for an optical DQPSK modulator |
February 5, 2008 |
| A modulator arrangement adapted to use a differential quadrature phase shift key for use in an optical wavelength division multiplex (WDM) optical communications system, comprising a precoder (16), which is adapted to generate drive voltages for first and second phrase modulators (6, |
| 7323804 |
Linear output, closed loop mover assembly |
January 29, 2008 |
| A mover assembly (16) that moves or positions an object (12) along a first axis includes a motor (20) and a coupling assembly (22). The motor (20) includes a motor output (332) that is moved along the first axis and about the first axis. The coupling assembly (22) includes a stage (344) |
| 7317570 |
Variable gain optical amplifiers |
January 8, 2008 |
| A variable gain optical amplifier comprises an EDFA for amplifying optical signals at different wavelengths and a pump driver 14 for optically pumping the EDFA to provide optical gain. An input detector 2 is provided for monitoring the power P.sub.in of input signals to the EDFA, and an |
| 7308182 |
Optical amplifiers |
December 11, 2007 |
| An optical amplifier comprises a printed circuit board (PCB) having at least one support layer of electrically non-conducting material and at least one conductive layer of electrically conducting material, and a foil heater in the form of a conductive track 20 on the PCB. A specified |
| 7295365 |
Optical gain flattening components, optical chips and optical amplifiers and methods employing s |
November 13, 2007 |
| An optical component for gain-flattening multiplexed passband signals amplified with optical pump power, comprises a launch port optical waveguide operative to communicate multiplexed passband signals in a passband wavelength range and optical pump power in a different wavelength ran |
| 7286577 |
Laser wavelength actuators |
October 23, 2007 |
| A laser-emitting device may be coupled to an electro-optically controlled wavelength actuator. An electro-optically controlled wavelength actuator may be a holographic wavelength actuator or a liquid crystal wavelength actuator. The electro-optically controlled wavelength actuator may |
| 7271523 |
Closed loop mover assembly with measurement system |
September 18, 2007 |
| A mover assembly (16) that moves or positions an object (12) includes a mover output (226), an actuator (230), and a measurement system (20). The mover output (226) is connected o the object (12), and the actuator (230) causes the mover output (226) to rotate about a first axis and move |
| 7259901 |
Optical signal demodulators |
August 21, 2007 |
| An optical signal demodulator for demodulating an M-ary phase shift key (PSK) optical signal comprises a plurality of interferometers arranged such that the optical signal is divided between the interferometers. Each interferometer comprises a plurality of interferometer arms, each arm f |
| 7257137 |
Tuneable laser having comb reflectors producing combs of reflective wavelength peaks |
August 14, 2007 |
| A tuneable laser is disclosed, including a gain section with first and second comb reflectors to one side thereof. The two reflectors each provide combs with substantially uniform spacings, the spacings differing as between the combs. Each comb reflector can be tuned so as to shift the |
| 7256920 |
Electro-optic modulator |
August 14, 2007 |
| A modulator circuit (28) for directing a voltage across a modulator element (26) to modulate a beam (20) includes a first inductor L1 that is electrically connected in parallel to the modulator element (26) and a second inductor L2 that is electrically connected in parallel to the fi |
| 7230960 |
Tunable external cavity laser with adjustable cavity length and mode-hop suppression |
June 12, 2007 |
| Tunable external cavity lasers are used in applications such as interferometry, FM spectroscopy, and optical communications equipment testing. Mode hop free high bandwidth frequency modulation operation is desired in a tunable external cavity laser. This application describes new and |
| 7224515 |
Optical amplifiers |
May 29, 2007 |
| A multichannel optical amplifier having an adjustable gain set point is controlled to permit substantially constant gain tilt control during a gain set-point change so that the channel powers are maintained during system modification. To this end the amplifier comprises an erbium doped |
| 7218659 |
High power semiconductor laser diode |
May 15, 2007 |
| 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 |
| 7206518 |
High speed optoelectronic subassembly and package for optical devices |
April 17, 2007 |
| A high speed optoelectronic subassembly in an optoelectronic package is disclosed that includes a dielectric support having a first electrical trace on a surface thereof and a dielectric member mounted on the surface of the support having a second electrical trace thereon. The support |
| 7204932 |
Polarization rotators |
April 17, 2007 |
| An improved method is provided for fabricating a polarisation rotator in a rib waveguide having a propagation axis and opposite side walls. The method includes etching a pit in the substrate surface to form a recess in one of the side walls of the waveguide, during formation of the w |
| 7184207 |
Semiconductor optical device |
February 27, 2007 |
| An optical device comprises a semiconductor structure including first and second ridge waveguides, each waveguide comprising a ridge extending across a surface of the semiconductor structure. The ridge of the first waveguide has a first height above a first region of the surface, and the |
| 7174080 |
Guided wave spatial filter |
February 6, 2007 |
| The invention concerns a guided wave spatial filter (300) for receiving input radiation and outputting corresponding filtered output radiation, the filter comprising first and second waveguide sections (30, L3, L5) connected in series, the sections: (a) mutually matched for transmitting |
| 7173953 |
Anti-reflection coatings for semiconductor lasers |
February 6, 2007 |
| The present invention concerns an anti-reflection coating for semiconductor lasers, in particular a coating on the laser facet with advantageous properties resulting in improved reliability and reduced probability of specific breakdowns, especially so-called catastrophic optical dama |
| 7173950 |
Low-noise high-power SHG laser system |
February 6, 2007 |
| A second harmonic generation laser system comprising: a non-linear frequency converting medium; and an external cavity pump laser that produces optical energy at a single mode and at a single frequency and that is disposed to provide the optical energy to the non-linear frequency con |
| 7161725 |
Frequency locker |
January 9, 2007 |
| A method and assembly for frequency stabilization of an optical signal especially from a laser, the assembly (11) comprising beam splitter (15), a passive frequency discriminator (16), and a pair of photodiodes (17 & 18). The beam splitter (15) in use receives a collimated optical beam ( |
| 7158549 |
Support structure for an optical device |
January 2, 2007 |
| An optical subassembly includes a substrate, a heat spreader, and a submount. The submount has a submount mounting surface and a component mounting surface with either the submount mounting surface or the component mounting surface including an angle. The submount is positioned on ei |
| 7145923 |
Tuneable laser |
December 5, 2006 |
| A tuneable laser has a gain section bounded at one end by a first reflector in the form of a distributed Bragg reflector adapted to produce a comb of reflective peaks and on the other end by a second Bragg reflector, the second Bragg reflector adapted to reflect at a plurality of wav |
| 7139118 |
Optical amplifiers |
November 21, 2006 |
| A multistage optical amplifier is controlled to compensate for the effect of amplified spontaneous emission (ASE) by a method comprising the following steps. Optical input and output signals to a first gain stage are detected, and the drive current to the first gain stage is controlled |
| 7122989 |
Multiple speed mover assembly |
October 17, 2006 |
| A mover assembly (16) that moves or positions an object (12) includes a mover output (226), an actuator (230), and a control system (18). The mover output (226) is connected to the object (12), and the actuator (230) causes the mover output (226) to move. The control system (18) sele |
| 7116460 |
Modulation control |
October 3, 2006 |
| A modulator arrangement for modulating an optical signal using a quadrature phase shift key for use in an optical wavelength division multiplex (WDM) optical communications system comprising a laser (2) for producing an optical signal of a selected wavelength, which signal is split b |
| 7106778 |
Tuneable laser |
September 12, 2006 |
| A tuneable laser having an active section, a phase section and a Bragg reflector comprising a plurality of discrete grating units, at least two of which gratings have a different pitch, wherein current is applicable to at least the grating having a longer pitch, such that the effective |
| 7106765 |
Tuneable laser |
September 12, 2006 |
| A tuneable laser includes a gain section bounded at one end by a first reflector adapted to produce a comb of reflective peaks and on the other end by a second reflector in the form of a plurality of discrete grating units each capable of reflecting at one of the peaks of the comb, and |
| 7099361 |
Laser source with high relative feedback and method for making such a laser source |
August 29, 2006 |
| The invention relates to the stabilization of high power 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 |
| 7099359 |
Optical pulse train generator |
August 29, 2006 |
| An optical pulse train generator (2) for use in the transmission of high speed optical data in a return-to-zero (RZ) signalling format is described. The generator (2) comprises a light source (4) operable to produce an unmodulated output; an electro-optic interferometric optical modu |
| 7088748 |
Tunable laser |
August 8, 2006 |
| A tuneable laser having an active section, a phase section and a Bragg reflector comprising a plurality of descrete grating units, at least two of which gratings have a discrete pitch, wherein at least two of the gratings having a different pitch are each provided with a plurality of |
| 7085299 |
High power semiconductor laser with a large optical superlattice waveguide |
August 1, 2006 |
| The invention relates to high power semiconductor diode lasers of the type commonly used in opto-electronics, mostly as so-called pump lasers for fiber amplifiers in the field of optical communication, e.g. for an erbium-doped fiber amplifier (EDFA) or a Raman amplifier. Such a laser, |
| 7082237 |
Optical modulators operated in parallel push-pull mode |
July 25, 2006 |
| A Mach-Zehnder interferometer modulator for modulating a beam of laser light includes a pair of separate waveguides through which the laser light is passed after splitting in a splitting zone and after which the light is recombined in a merge zone. The waveguides are formed in a semi |
| 7079312 |
Optical amplifiers |
July 18, 2006 |
| An EDF amplifier comprises two EDF loops separated by optical isolators and pumped with light by pump laser diodes under the control of an output power control system. To achieve the required output power the current supplied to the pump supplying light to the input loop is set to the |
| 7072441 |
Alignment diffractometer |
July 4, 2006 |
| The invention is concerned with a method f alignment for aligning crystal planes of a wafer substrate (40) to lithographic features thereon, the method characterized in that it includes the steps of: (a) measuring angular orientation of a peripheral flat (200) of the substrate (40); (b) |
| 7066658 |
Method of securing an optical fibre to an electronic package |
June 27, 2006 |
| An optical fibre is secured to an electronic package (10) by, firstly, providing in a wall (14) of the package (10) an electrically conductive tube (12), an inductance arrangement (16 22) in magnetically co-operational relation to the tube (12) and a securing agent inside the tube, t |
| 7064625 |
Transmission line structures |
June 20, 2006 |
| A composite waveguide termination structure including two different waveguide conductor geometries operatively located upon a common substrate, wherein each such waveguide geometry includes a ground conductor on the same surface of the substrate. |
| 7060516 |
Method for integrating optical devices in a single epitaxial growth step |
June 13, 2006 |
| A method for integrating optical devices in a single growth step by utilizing a combination of Selective Area Growth and Etch (SAGE) is provided. An first device is formed between a set of oxide-masked regions, whilst a second device is formed in an adjacent planar region. By use of |
| 7043910 |
Thermal actuator |
May 16, 2006 |
| An asymmetric MEMS thermal actuator device includes a base portion, typically a pair of bond pads, and an actuator element connected to the base portion by a flexure portion. The actuator element has a first arm and a second arm alongside the first arm and spaced from the first arm. |
| 7035509 |
Semiconductor optical waveguide device |
April 25, 2006 |
| 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 wavegui |
| 7035486 |
Photonic integrated device |
April 25, 2006 |
| A photonic integrated device having a substrate layer, epitaxial layers formed on said substrate layer and a guiding layer formed by one of the epitaxial layers. An optical waveguide is formed within the guiding layer. In the waveguide are a splitter (4) having at least two outputs, |
| 7035305 |
Monolithically integrated high power laser optical device |
April 25, 2006 |
| An optical device, including a monolithically integrated diode laser and semiconductor optical amplifier, that has reduced linewidth and improved side mode suppression for a given output power target. In a preferred embodiment, the diode laser is detuned from a gain peak wavelength to an |
| 7026744 |
Remote control and power system |
April 11, 2006 |
| A remote device such as a control value (4) is powered and controlled by optical energy, supplied by an intensity-modulated light source (8) and optical fiber (10). After conversion into electrical form, the light is detected at (12) and applied to a piezoelectric transformer (14). The |
| 7024056 |
Electro-optic gating arrangement with improved duty cycle |
April 4, 2006 |
| The device includes an oscillator (1) to generate an electrical signal of a predetermined frequency and a signal divider (2) to split the electrical signal into first and second signals. The frequency of the second signal is tripled by tripler (3) and the tripled second signal is rec |
| 6993054 |
Enhanced link operation of directly modulated lasers using gain-coupled gratings |
January 31, 2006 |
| Increasing the gain-coupling of a DFB directly modulated semiconductor laser permits the output response to be overdamped without lowering the relaxation oscillation frequency of the output. The overdamping permits the laser to operate at modulation frequencies which approach the rel |
| 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 |
