Method and device for measuring half-wave voltage of...

Details Method and device for measuring half-wave voltage of... Method and device for measuring half-wave voltage of...

2006-11-28

2006-11-28

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

By light interference

Using fiber or waveguide interferometer

C356S477000, C359S237000, C359S279000, C385S003000, C385S005000

Reexamination Certificate

active

07142309

ABSTRACT:
A method and a device for measuring the half-wave voltage of a Mach-Zehnder type optical modulator accurately and without depending on the bias variation of an optical modulator. The method of measuring the half-wave voltage of the Mach-Zehnder type optical modulator the steps of applying a high-frequency AC signal34and a monitoring low-frequency AC signal35in a superimposed manner to a Mach-Zehnder type optical modulator1, or applying the both respectively to separately constituted electrodes, and observing the low-speed response of an output light from the optical modulator1, wherein the half-wave voltage at a frequency to be measured of the Mach-Zehnder type optical modulator1is measured by using the voltage amplitude of the high-frequency AC signal34when the intensity change of an out put light by the monitoring low-frequency AC signal35is almost zero with the voltage amplitude of the high-frequency AC signal34kept variable.

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patent: 10/148801 (1998-06-01), None
patent: 2001-159749 (2001-06-01), None

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