OPTICAL MODULATOR, OPTICAL TRANSMITTER, AND BIASVOLTAGE ADJUSTMENT METHOD OF OPTICAL MODULATOR
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United States of America Patent
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Issued Date -
May 16, 2024
app pub date -
Oct 27, 2023
filing date -
Nov 10, 2022
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Abstract
An object is to provide an optical modulator capable of adjusting a bias voltage with a simple signal measurement. In a third Mach-Zehnder type optical modulator, a first MZ optical modulator is provided on one arm and a second MZ optical modulator is provided on the other arm. A first photodetector monitors a first output light from the first MZ optical modulator and output a first monitor signal. A second photodetector monitors a second output light from the second MZ optical modulator and output a second monitor signal. A third photodetector monitors a third output light from the third MZ optical modulator and output a third monitor signal. a bias voltage generation unit independently adjusts first to third bias voltages provided to the first to third MZ optical modulators based on the first to third monitor signals, respectively.
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