Advantage and Core Benefit
- Electrical measurement of waveforms of Sub-THz to THz class high-frequency electrical signals used in Beyond5G using existing oscilloscopes.
- Optical sampling pulse trains for wavelength multiplexing interleaving at high frequencies were generated by time compression after simultaneous superimposition of low-frequency (inexpensive, high-quality) pulse waveforms on the different wavelength components of the time-extended multiple pulse train.
- High quality, low cost, low power consumption, and high wavelength design freedom, optical sampling pulse trains can be generated.
Background and Technology
Beyond 5G, which is expected to be widely used around 2030, is expected to utilize a frequency band of 100 GHz or higher. In the measurement of the time-axis intensity waveform of high-frequency electrical signals, attention is focused on improving the performance of analog-to-digital conversion using a wavelength-multiple interleaving function that uses an optical sampling pulse train with a different center wavelength for each pulse.
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In the conventional technology, higher-frequency time waveform sampling was possible by using optical sampling pulse trains, in which pulsed light with a sampling frequency that can be measured with an oscilloscope is divided into separate wavelengths by a wavelength selective switch (WSS) and delayed by a certain amount of time and multiplexed. However, the WSS is expensive and the degree of freedom of the wavelengths that can be divided is limited.
Therefore, in the present invention, multiple pulse beams (#1) are time-extended by a dispersive device and superimposed on adjacent pulse beams (#2), and pulse waveforms of the same frequency as #1 are simultaneously superimposed (#3) by a low-frequency (inexpensive and high-quality) arbitrary waveform generator, followed by time compression by an inverse dispersive device to generate an optical sampling pulse train (#4) for wavelength division interleaving in which the pulse beams of the desired wavelength are delayed by the desired time (frequency) between pulse beams of frequency #1.
This invention enables high-frequency electrical signal waveforms in the Sub-THz to THz class to be measured with high accuracy and low cost using existing oscilloscopes.
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The figure shows 2x decompression/compression,
but any number of decompressions are possible.
Patent
- Pending
Researcher
- Tsuyoshi KONISHI (Osaka University, Graduate School of Engineering, Associate Professor)
Expectations
- We are seeking companies to in-license this technology or work with our researchers (with technical guidance from the inventor) to further develop this technology.
Project No. HK-04558