NeoPhotonics has patented an improved method for detecting and measuring dither signals in an electro-optical modulator. By integrating voltage bias adjustments based on signal evaluation, the technology corrects optical phase shifts to enhance optical modulation efficiency. GlobalData’s report on NeoPhotonics gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on NeoPhotonics, was a key innovation area identified from patents. NeoPhotonics's grant share as of February 2024 was 40%. Grant share is based on the ratio of number of grants to total number of patents.
Voltage bias adjustments for electro-optical modulator
A recently granted patent (Publication Number: US11870407B2) discloses a method involving the transmission of a dither signal and a data signal to radio frequency (RF) electrodes of a Mach-Zehnder Modulation (MZM) phase modulator. This enables the calculation of a voltage drift within the MZM phase modulator, which includes components such as an optical input waveguide, an optical output waveguide, and MZM arms with RF electrodes and resistive heaters. The method further involves receiving a signal from a variable gain amplifier (VGA) via an analog-to-digital converter (ADC) and determining a voltage bias based on this signal by integrating a time derivative voltage bias as a function of time. The calculated voltage bias is then applied to the resistive heater to produce an optical phase shift that corrects the voltage drift.
Additionally, the patent claims detail various aspects of the method, such as the connection of the resistive heater to receive the voltage bias for controlling phase modulation using heat, scaling the voltage bias by a square root of a target phase shift, and the output of the voltage bias by a processor connected to the ADC. The method also involves the configuration of the VGA to receive the signal from a transimpedance amplifier (TIA) via a DC blocker, with the gain of the VGA dynamically adjusted to ensure optimal operation between 50% and 100% of a full-scale ADC input. Furthermore, specific claims within the patent mention that the VGA maximum output should operate between 80% and 100% of the full-scale ADC input, highlighting the precision and control involved in the modulation process.
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