Optical Signal Generation for Sub-THz Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in generating and transmitting ultrahigh-speed signals, particularly in the sub-THz band, due to limitations in existing electronic devices which struggle with high frequency operations and phase noise issues.
Innovation Solution
The use of optical devices, such as lasers, optical couplers, and photodetectors, to generate sub-THz band signals by combining optical signals of different wavelengths, which reduces phase noise through correlated optical comb signals and stabilizes the timing jitter of ultrahigh-speed pulse trains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronic devices are used to generate sub-THz band signals, then signal transmission can be achieved, but phase noise increases and high frequency operations become difficult
Solution Approach 1:
The patent replaces electronic devices with optical devices for signal generation. Specifically, it uses optical comb signals generated by optical devices (such as mode-locked lasers) to drive photodetectors, which then generate sub-THz band signals. This substitution of optical systems for electronic systems at high frequencies resolves the phase noise and high-frequency operation limitations inherent in electronic devices.
2Reliability
If optical devices are used to generate sub-THz band signals, then phase noise is reduced and signal stability is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple optical functions into an integrated optical device system. It merges the optical comb signal generation, photodetection, and sub-THz signal generation into a coordinated system where optical devices generate comb signals that are directly used to drive photodetectors, eliminating the need for separate electronic oscillators and reducing overall system complexity despite using optical components.
3Speed
If electronic devices operate at high frequencies, then sub-THz signal generation is possible, but timing jitter increases
Solution Approach 1:
The patent substitutes optical timing mechanisms for electronic timing mechanisms. Optical devices such as mode-locked lasers generate optical comb signals with inherently stable timing characteristics. These optical signals drive the photodetectors to generate sub-THz signals, thereby achieving high-frequency operation with reduced timing jitter compared to purely electronic approaches.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the generation of high-speed sub-THz band signals with improved phase noise characteristics, overcoming the limitations of electronic devices in high-frequency operations and enhancing signal transmission efficiency.
Implementation Method 1
a photodetector, which converts the optical signal into an electrical signal
Implementation Method 2
generating sub-THz band signals based on an optical device by combining optical signals of different wavelengths
Data Source
AI summary
Disclosed herein is a method of transmitting a signal of a user equipment (UE) in a wireless communication system. The method includes generating an optical signal related to data transmission, combining an electrical signal for the data with the optical signal, and transmitting a combined signal.