| 摘要 |
A method and arrangement of electrodes for increasing the resolution of a digital phase modulator for a fiber-optic signal transmission or measuring device. A predetermined total number m of electrodes of different lengths are arranged parallel and on both sides with respect to a light guiding path in or on an optical substrate. The electrodes are divided into two groups. A first group n of electrodes represents a coarse modulator with binary and more significant weighted electrodes of length ratio b<SUB>n+0</SUB>:b<SUB>n</SUB>=2, the longest electrode of which corresponds to the sum of lengths of all the remaining electrodes of the overall modulator. A second, smaller group of n<SUB>0 </SUB>non-binary and less significant weighted electrodes represents a fine modulator. The smallest output values are not formed by driving individual electrodes of the fine modulator, but rather by forming the difference, in each case, between two larger electrodes. The subdivision into two different modulator concepts makes it possible to achieve a resolution in a value range of approximately 12 bits within a short structural length that would otherwise permit a resolution of only 9 bits. A correction table may optionally be employed.
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