OPTICAL TRANSMITTER
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, whi...
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Main Authors | , |
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Format | Patent |
Language | English |
Published |
20.08.2009
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Subjects | |
Online Access | Get full text |
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Summary: | 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 |
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Bibliography: | Application Number: JP20080026816 |