Electro-optic waveguide polarisation modulator

An electro-optic waveguide polarisation modulator 20, which may be used in an optical communication network or a quantum cryptography system, comprises a waveguide core 4 having first and second faces defining a waveguide core plane. A plurality of primary electrodes 22, 24 are arranged at a first s...

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Bibliographische Detailangaben
Hauptverfasser:	BRIAN SINCLAIR LOWANS, EWAN DAVID FINLAYSON, PHILIP MICHAEL GORMAN, JOHN MICHAEL HEATON, MICHAEL JOHN KANE
Format:	Patent
Sprache:	eng
Schlagworte:	DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	An electro-optic waveguide polarisation modulator 20, which may be used in an optical communication network or a quantum cryptography system, comprises a waveguide core 4 having first and second faces defining a waveguide core plane. A plurality of primary electrodes 22, 24 are arranged at a first side of the waveguide core plane and out of said plane, and at least one secondary electrode 26 is arranged at a second side of the waveguide core plane and out of said plane. The electrodes 22, 24, 26 are adapted in use to provide an electric field having field components 13, 15 in two substantially perpendicular directions within the waveguide core 4. The electric field modulates the refractive index such that electromagnetic radiation propagating through the core 4 is converted from a first polarisation state to a second polarisation state. The first and second polarization states may comprise any type of polarization state.