Opto-Electronic Integrated Circuit for Terahertz Array Antennas
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Solution Overview
Problem
Conventional optical signal distribution circuits for generating terahertz waves are complex and inefficient, requiring multiple optical splitters, phase modulators, and fiber amplifiers, which lead to degradation of the optical beat state and increased circuit size due to the need for independent amplification of λ1 and λ2 signals.
Innovation Solution
An opto-electronic integrated circuit with an optical splitter and N optical phase modulators on a substrate that branch and phase-modulate input optical signals, allowing for phase control based on wavelength-dependent phase change, reducing the number of required components and integrating photodiodes and antennas on a common substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional optical signal distribution circuits use multiple optical splitters and fiber amplifiers for independent amplification of λ1 and λ2 signals, then the optical signals can be distributed to multiple OE conversion devices, but the circuit becomes complex and the optical beat state degrades
Solution Approach 1:
The patent merges the amplification function into a single fiber amplifier that amplifies the combined optical signal containing both λ1 and λ2 wavelengths simultaneously. This eliminates the need for separate amplifiers for each wavelength, reducing circuit complexity while maintaining optical beat state stability through unified amplification and a single polarization adjustment unit.
Solution Approach 2:
The patent employs a universal polarization adjustment unit that adjusts the polarization state for both λ1 and λ2 signals simultaneously after they are combined. This multi-functional approach replaces multiple wavelength-specific adjustment components, simplifying the circuit while ensuring stable optical beat state for all signals.
2Reliability
If conventional circuits use independent fiber amplifiers for λ1 and λ2 signals, then each signal can be amplified independently, but the chip size increases and the optical beat state degrades due to polarization instability
Solution Approach 1:
The patent combines the amplification of λ1 and λ2 signals into a single fiber amplifier stage, eliminating the need for multiple amplifiers and reducing chip area. The combined amplification approach maintains polarization stability by using a single polarization adjustment unit for both wavelengths.
Solution Approach 2:
The patent extracts the polarization adjustment function into a single dedicated unit that operates on the combined optical signal after amplification. This centralized polarization control replaces multiple distributed adjustment mechanisms, improving polarization stability while minimizing chip area usage.
3Adaptability or versatility
If multiple optical splitters are used to distribute signals to N OE conversion devices, then sufficient signal distribution is achieved, but the circuit configuration becomes complicated and requires more components
Solution Approach 1:
The patent uses a hierarchical splitter configuration where a first optical splitter divides the combined optical signal into multiple paths, and second optical splitters further divide each path to reach N OE conversion devices. This segmented approach achieves comprehensive signal distribution with fewer total components compared to using only multiple first-stage splitters.
Solution Approach 2:
The patent introduces a two-stage splitting hierarchy that adds a dimensional layer to the signal distribution architecture. Instead of using multiple parallel first-stage splitters, the signal flows through sequential splitting stages, reducing the total component count while maintaining full distribution capability to all N devices.
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 configuration simplifies the circuit, stabilizes the optical beat signal, and reduces the chip size by allowing single-fiber amplification, enabling a compact and high-output terahertz wave array antenna device or receiver with improved sensitivity.
Implementation Method 1
N optical phase modulators formed on the substrate for the respective optical signals output from the optical splitter, the optical phase modulators adjusting phases of the optical signals based on a phase modulation characteristic in which a phase change amount changes depending on a wavelength of light
Implementation Method 2
N photodiodes formed on the substrate for the respective optical phase modulators, the photodiodes outputting electrical signals obtained by OE-converting the optical signals
Data Source
AI summary
An opto-electronic integrated circuit includes an optical splitter (12, 13A, 13B) formed on a substrate, the optical splitter branching an input optical signal into N (N is an integer of 2 or more) optical signals, and outputting the optical signals, and N optical phase modulators (15A-15D) formed on the substrate for the respective optical signals output from the optical splitter, the optical phase modulators adjusting the phases of the optical signals based on a phase modulation characteristic in which the phase change amount changes depending on the wavelength of light, and output the optical signals.