OPTICAL TRANSMITTER

PROBLEM TO BE SOLVED: To prevent an amplifier from being damaged by an excessive input.SOLUTION: An electric field measurement device 1 comprises: a head part 20 that outputs modulation light L2 on the basis of a detection signal Sa in response to electric field intensity of an electromagnetic wave...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	YAZAWA SHINOBU, MAIE TAKUJI, MURE KATSUHITO, KOSUGI JUNICHI
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 MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF TESTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To prevent an amplifier from being damaged by an excessive input.SOLUTION: An electric field measurement device 1 comprises: a head part 20 that outputs modulation light L2 on the basis of a detection signal Sa in response to electric field intensity of an electromagnetic wave detected by an antenna 10; and a controller part 40 that outputs a measurement signal Sm indicative of the electric field intensity of the electromagnetic wave on the basis of the modulation light L2. The head part 20 comprises: a first transmission part 21 that has a transmission line path 12 for transmitting the detection signal Sa, and an amplifier 15 for amplifying the detection signal Sa; a second transmission part 22 that has a transmission line path 13 for transmitting the detection signal Sa; and an optical modulator 25 that converts the detection signal Sa transmitted by the first transmission part 21 or the second transmission part 22, and outputs the modulation light L2. An allowable input to the second transmission part 22 is larger than an allowable input to the first transmission part 21.