BIAS CIRCUIT OF EXTERNAL MODULATOR

PROBLEM TO BE SOLVED: To provide a bias circuit of an external modulator in which fluctuation of a DC bias is suppressed, and a connection part between the external modulator and the bias circuit is downsized. SOLUTION: A DC bias means has: an adjusting voltage setting means for setting adjusting vo...

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Bibliographic Details
Main Authors HORIO TAKEO, TAKAHASHI TOMOKAZU
Format Patent
LanguageEnglish
Published 30.07.2009
Subjects
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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Summary:PROBLEM TO BE SOLVED: To provide a bias circuit of an external modulator in which fluctuation of a DC bias is suppressed, and a connection part between the external modulator and the bias circuit is downsized. SOLUTION: A DC bias means has: an adjusting voltage setting means for setting adjusting voltage for supplying optimal DC bias voltage to the external modulator; a control transistor which constitutes a constant current source for supplying the DC bias current to a terminal resistor connected in parallel with the external modulator; and a buffer amplifier which supplies fixed bias voltage based on the adjusting voltage to the control transistor. COPYRIGHT: (C)2009,JPO&INPIT
Bibliography:Application Number: JP20080003354