90° OPTICAL HYBRID

90° OPTICAL HYBRID

PROBLEM TO BE SOLVED: To achieve a high polarization extinction ratio even in a wideband regarding a 90° optical hybrid detecting I and Q channel signals by mixing signal light and local light. SOLUTION: The 90° optical hybrid includes: a half mirror receiving a signal obtained by polarizing a modul...

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Bibliographische Detailangaben
Hauptverfasser: TAKAYAMA YOSHIHISA, TOYOSHIMA MORIO, KOJO KENJI, KOTAKE TOMOHARU, SHOJI YOZO
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
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
FREQUENCY-CHANGING
NON-LINEAR OPTICS
OPTICAL ANALOGUE/DIGITAL CONVERTERS
OPTICAL LOGIC ELEMENTS
OPTICS
PHYSICS
TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
TRANSMISSION
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Beschreibung
Zusammenfassung:PROBLEM TO BE SOLVED: To achieve a high polarization extinction ratio even in a wideband regarding a 90° optical hybrid detecting I and Q channel signals by mixing signal light and local light. SOLUTION: The 90° optical hybrid includes: a half mirror receiving a signal obtained by polarizing a modulated signal light via a 1/2 wave plate and receiving a signal obtained by polarizing a local light via a 1/4 wave plate; a first polarization separating element having a high polarization extinction ratio and receiving a light signal obtained by polarizing the signal light transmitting the half mirror and a local light reflected by the half mirror; a first photodetector receiving a horizontal polarization I channel signal light transmitting the first polarization separating element; a second polarization separating element having the same high polarization extinction ratio as the first polarization separating element and outputting a reflection signal light by receiving a vertical polarization Q channel signal light reflected by the first polarization separating element; and a second photodetector receiving the reflection signal light. COPYRIGHT: (C)2011,JPO&INPIT