OPTICAL INTENSITY MODULATING ELEMENT AND OPTICAL INTENSITY MODULATOR

OPTICAL INTENSITY MODULATING ELEMENT AND OPTICAL INTENSITY MODULATOR

PURPOSE:To provide the optical intensity modulator which sufficiently decreases return light by the simple method without specifically preparing an optical isolator. CONSTITUTION:The modulator consists of two sheets of parallel disposed quarter-wave plates 22, 24, the optical axes of the crystals of...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: KANETAKE TATSURO, TANIGUCHI MORIO, KIGUCHI MASAFUMI
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:PURPOSE:To provide the optical intensity modulator which sufficiently decreases return light by the simple method without specifically preparing an optical isolator. CONSTITUTION:The modulator consists of two sheets of parallel disposed quarter-wave plates 22, 24, the optical axes of the crystals of which are inclined at 45 deg. with a vertical direction, a straight polarizer 26, the transmission axis of which is parallel with the vertical direction and an optical waveguide 20. This optical waveguide consists of a metallic electrode, a p-doped GaAs substrate, a GaAs/AlGaAs superlattice layer and an n-doped GaAs layer. The modulator is driven by an electric signal having a suitable bias voltage from the outside and modulates the intensity of the light from a semiconductor laser polarized to the vertical direction. The modulator has a lens for coupling and the light emitted from the modulator is made incident on an optical fiber.