OPTICAL TRANSMITTER

• Main Authors: HORIO TAKEO, YOKOYAMA SHUJI
• Format: Patent
• Language: English
• Published: 20.08.2009
• 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; 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

PROBLEM TO BE SOLVED: To provide an optical transmitter capable of accurately controlling a drive amplitude of a modulation signal so as to suppress variations thereof in accordance with a change in the ambient temperature of a drive circuit. SOLUTION: The drive circuit of an external modulator, which modulates emitted light from a light source based on an input signal, includes: a voltage supply means for supplying to the external modulator a drive voltage corresponding to the input signal while superimposing it on a DC bias voltage; a control means for setting an amplitude of the drive voltage; and a voltage detection means for detecting the drive voltage supplied from the voltage supply means to the external modulator, wherein the control means fetches a detection output of the voltage detection means and controls the voltage supply means on the basis of the detection output in such a way that the drive voltage becomes a predetermined amplitude value. COPYRIGHT: (C)2009,JPO&INPIT