Optical modulation device, driving method of optical modulation device, and manufacturing method of optical modulation device
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United States of America Patent
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Mar 4, 2014
Grant Date -
May 2, 2013
app pub date -
Oct 22, 2012
filing date -
Apr 22, 2010
priority date (Note) -
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Abstract
When phases of lights passing through arms are adjusted, a first DC bias and a first modulation signal are applied to one arm from one modulating electrode, and a second DC bias and a second modulation signal are applied to the other arm from the other modulating electrode. The first and second DC biases are applied to the modulating electrodes such that a rate of a product of a length of one modulating electrode and the first DC bias and a product of a length of the other modulating electrode and the second DC bias is kept at a constant value. According to this constitution, it is possible to enable an optimum control of a phase difference between the arms and a precise control of wavelength chirp characteristics with a simple element constitution, and an optical modulation of which device size is small and having fine characteristics is enabled.
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