Lumentum Operations LLC

The Secretary of State for Defence in Her Britannic Majesty's Government

Qinetiq Limited

U2t Photonics UK Limited

The Secretary of State for Defense in Her Britannic Majesty's Government

Filtronic Plc

John M Heaton

David R Wight

Richard Michael Jenkins

Karl M Kissa

Robert Anthony Griffin

Meirion F Lewis

Oleg Bouevitch

Stephen K Jones

David Glassner

Christopher L West

Brian Sinclair Lowans

David John Robbins

Ewan David Finlayson

Roger Timothy Carline

Philip Michael Gorman

Konstantin Petrovich Petrov

Michael J Kane

Robert W Devereux

Weng Y Leong

David C W Herbert

Edward T R Chidley

Colin M Boyne

Philippa Julia Mary Parmiter

An electrical-optical modulator may include one or more optical waveguides to propagate one or more optical signals in a direction of propagation. An optical waveguide of the one or more optical waveguides may include a time delay section, a first modulation section preceding the time delay section in the direction of propagation, and a second modulation section following the time delay section in the direction of propagation. The first modulation section and the second modulation section may be configured to be associated with opposite modulation polarities, and the time delay section may be configured to delay a phase of the one more optical signals relative to the first modulation section. The electrical-optical modulator may include one or more signal electrodes to propagate one or more signals in the direction of propagation in order to modulate the one or more optical signals through electrical-optical interaction.

Electrical-optical modulator

An electrical-optical modulator may include a first section configured for a first electrical-optical interaction between one or more optical waveguides and one or more signal electrodes. The electrical-optical modulator may include a second section configured to increase or decrease a relative velocity of signals of the one or more signal electrodes to optical signals of the one or more optical waveguides relative to the first section. The electrical-optical modulator may include a third section configured for a second electrical-optical interaction between the one or more optical waveguides and the one or more signal electrodes according to an opposite modulation polarity relative to the first section.

An on-chip wavelength locker may include an optical waveguide splitter to split an input optical signal received from a laser. The on-chip wavelength locker may include a plurality of integrated periodic optical elements, each to receive a respective portion of the input optical signal after splitting of the input optical signal by the optical waveguide splitter, and provide, based on the respective portion of the input optical signal, a respective periodic output optical signal of a plurality of periodic output optical signals. Each periodic output optical signal, of the plurality of periodic output optical signals, may be phase shifted with respect to other periodic output optical signals of the plurality of periodic output optical signals. The on-chip wavelength locker may include a plurality of integrated photodiodes to receive the plurality of periodic output optical signals in association with wavelength locking the laser.

On-chip wavelength locker

A semiconductor waveguide optical device and a method of manufacturing of a semiconductor optical device are disclosed. The semiconductor waveguide optical device may include a gradient index waveguide for mode conversion and/or vertical translation of optical modes of step-index waveguides, which may be disposed on or over a same substrate as the gradient index waveguide. The gradient index waveguide may be epitaxially grown.

Semiconductor optical waveguide device

An electro-optic waveguide polarization modulator includes cladding layers, and a waveguide core sandwiched between the cladding layers, wherein the waveguide core has a higher refractive index than the cladding layers. The modulator further includes primary electrodes arranged on the opposite side of one cladding layer to the core and a secondary electrode arranged on the opposite side of another cladding layer to the core. The electrodes are arranged to provide an electric field having field components in perpendicular directions within the waveguide core so as to modulate the refractive index such that electromagnetic radiation propagating through the core is converted from a first polarization state to a second polarization state. The modulator further includes a grading layer sandwiched between the cladding layers and the core, the grading layer having an effective refractive index intermediate between that of the waveguide core and the cladding layer.

Electro-optic waveguide polarisation modulator and a method of modulation

An electro-optic waveguide polarization modulator () comprising a waveguide core () having first and second faces defining a waveguide core plane, a plurality of primary electrodes () arranged at a first side of the waveguide core plane and out of said plane, and at least one secondary electrode () arranged at a second side of the waveguide core plane and out of said plane, wherein the electrodes () are adapted in use to provide an electric field having field components () in two substantially perpendicular directions within the waveguide core () so as modulate the refractive index thereof such that electromagnetic radiation propagating through the core () is converted from a first polarization state to a second polarization state.

Electro-optic waveguide polarisation modulator

A tuneable electro-optic modulator () comprising first and second spaced apart output optical waveguides (), each output optical waveguide comprising a coupled portion () optically coupled to a corresponding coupled portion () of the other output optical waveguide, the coupled portions defining a coupling region () therebetween; an optical source adapted to symmetrically provide an optical signal to the first and second output optical waveguides; a portion of each of the output optical waveguides having a signal electrode () thereon; the modulator further comprising a central optical waveguide (), at least a portion of which is arranged in the coupling region, the central optical waveguide having a tuning electrode () thereon.

Tuneable electro-optic modulator

A device for generating an electrical signal with a wide band arbitrary waveform includes at least two continuous wave lasers each being adapted to produce light at a different wavelength. The device also includes at least one pulse generator adapted to convert the light from the lasers into optical pulse trains and a plurality of optical modulators. Each modulator is adapted to receive an optical pulse train at at least one wavelength and modulate the optical pulse train in response to an electromagnetic signal. An optically dispersive element is adapted to receive the optical pulse trains from the modulators and to introduce a wavelength dependent delay between the optical pulse trains. The device further includes a photodetector for receiving the modulated dispersed optical pulse trains and producing an analogue electrical signal in response thereto.

Method and device for generating an electrical signal with a wide band arbitrary waveform

A four arm linearized Mach Zehnder modulator comprising

Four arm linearised Mach Zehnder modulator

A Mach-Zehnder type electro-optic modulator based, for example, on GaAs/GaAlAs of InP/InGaAsP comprises coplanar stripline (CPS) electrodes, and optical waveguides, disposed on a conducting substrate or a conducting epitaxial layer, wherein the regions underlying the CPS electrodes are selectively rendered insulating by ion implantation to electrically isolate the CPS electrodes.

Travelling-wave guide electro-optic modulator

A horizontal access semiconductor photo detector () comprises a horizontal light absorbing layer () for converting light into photo-current which layer is configured to confine light within it in whispering gallery modes of propagation. The detector is configured to have a first waveguide portion () and a second light confining portion () arranged such that the waveguide portion couples light into the detector and transfers light into the light confining portion so as to excite whispering gallery modes of propagation around the light confining portion. The light absorbing layer may be part of the light confining portion or alternatively light can be coupled into the light confining portion or alternatively light can be coupled into the light absorbing layer from the light confining portion by evanescent coupling. The excitation of whispering gallery modes within the light absorbing layer significantly increases the effective absorption coefficient of the light absorbing layer.

Horizontal access semiconductor photo detector

A device for spatially separating components of frequency in a primary radiation beam comprising means for separating the primary radiation beam into a plurality of secondary radiation beams, a plurality of electrically biasable waveguides forming a waveguide array, each for transmitting a secondary radiation beam to an output, wherein each waveguide has an associated optical delay line having a corresponding optical delay time, wherein each of the optical delay times is different. The device also comprises means for applying a variable electric field across each of the waveguides such that the phase of the secondary radiation beams transmitted through each may be varied by varying the electric field. The secondary radiation beams output from each of the waveguides interfere in a propagation region with a secondary radiation beam output from at least one of the other waveguides so as to form an interference pattern comprising one or more maximum at various positions in the propagation region.

Electrically tuneable optical filter

Optical mixing device

A signal routing device (10) incorporates a multimode beamsplitter waveguide (20) connected by a set of parallel relay waveguides (22) to a multimode recombiner waveguide (24). Each relay waveguide (22) contains a respective electro-optic phase shifter (36). Sets of input and output waveguides (18, 28) are connected to the beamsplitter and recombiner waveguides (20, 24) respectively. The input and output waveguides (18, 28) are periodically spaced at off-center positions across the respective multimode waveguide transverse cross-section associated therewith. Radiation in any one of the input waveguides (18) is distributed between the relay waveguides (22) by virtue of modal dispersion in the beamsplitter waveguide (20). The phase shifters (36) apply a set of phase shifts to the distributed radiation. Modal dispersion in the recombiner waveguide (24) results in the phase shifted radiation providing a non-zero input to one or more of the output waveguides (28). Different sets of phase shifts provide for radiation in any one of the input waveguides (18) being transferred selectably to any one or more of the output waveguides (28), as required for selectable signal routing.

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Malvern, United Kingdom

John M Heaton