Compact Lithium Niobate Photonics With Nested Photodiode Layout
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Solution Overview
Problem
Conventional optical devices face challenges in achieving low optical and microwave losses, wide bandwidth modulation, and compact size while maintaining efficient optical and electrical connections.
Innovation Solution
The use of lithium niobate and lithium tantalate optical channels with specific thickness and length configurations, along with optimized electrode designs and photodiode arrangements, reduces optical losses and voltage requirements, enabling efficient signal modulation and compact device design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional optical devices are used, then optical connections and electrical connections can be made, but optical losses and microwave losses are high
Solution Approach 1:
The patent changes the physical parameters of the optical channel by using thin film lithium niobate with specific thickness (200-1000 nm) and aspect ratio configurations. This parameter optimization reduces optical losses to ≤10 dB and microwave losses while maintaining effective optical and electrical connections, resolving the contradiction between connection reliability and energy loss.
2Area of stationary object
If conventional optical devices are used, then signal transmission can be achieved, but device area is large
Solution Approach 1:
The patent transitions from planar integration to three-dimensional vertical stacking by positioning the photodiode array beneath the optical channel at different vertical levels. This dimensional change enables compact device footprint while maintaining efficient optical signal transmission through the thin film lithium niobate waveguide, reducing device area without sacrificing transmission productivity.
Solution Approach 2:
The patent implements a nested structure where the photodiode array is positioned beneath the optical channel, with the optical channel containing the thin film lithium niobate layer. This nested arrangement allows multiple functional components to occupy overlapping spatial volumes, significantly reducing the overall device footprint while maintaining signal transmission efficiency.
3Use of energy by moving object
If conventional optical devices are used, then optical modulation can be achieved, but voltage requirements are high
Solution Approach 1:
The patent optimizes the electro-optic parameters by using thin film lithium niobate with thickness of 200-1000 nm and specific aspect ratios. This parameter optimization enhances the electro-optic effect strength, reducing the half-wave voltage Vπ to ≤4.5 volts while maintaining effective optical modulation across a wide bandwidth of 50-100 GHz, thereby improving ease of operation without excessive energy consumption.
Solution Approach 2:
The patent employs composite material structure combining thin film lithium niobate with metal electrodes and photodiode arrays. This composite configuration optimizes the electro-optic interaction, enabling efficient optical modulation at reduced voltage levels by leveraging the high electro-optic coefficient of lithium niobate in thin film form.
4Adaptability or versatility
If conventional optical devices are used, then bandwidth can be limited, but device complexity is low
Solution Approach 1:
The patent implements dynamic performance characteristics by optimizing the thin film lithium niobate optical channel to support wide bandwidth operation from 50-100 GHz. The thin film structure enables frequency-dependent electro-optic modulation that adapts to different signal frequencies, achieving wide bandwidth adaptability through carefully controlled film thickness and aspect ratio parameters.
Solution Approach 2:
The patent achieves wide bandwidth through precise parameter control of the thin film lithium niobate layer, including thickness (200-1000 nm) and aspect ratio. These parameter optimizations enable the device to maintain effective optical modulation across a broad frequency range of 50-100 GHz, enhancing adaptability without requiring complex multi-component structures.
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
The solution achieves low optical losses (≤10 dB) and reduced Vπ (≤4.5 volts) over a wide frequency range (50-100 GHz), allowing for a more compact and efficient optical device with improved signal modulation and reduced material and power consumption.
Implementation Method 1
An optical channel includes an electro-optic material having a thickness of at least two hundred nanometers and not more than one thousand nanometers... an electrode signal modifies an optical signal for the optical channel
Data Source
AI summary
An optical device is described. The optical device includes a substrate, an optical channel, a photodiode and an optical path that couples the channel to the photo diode. The optical path has an optical path length that is at least one fourth of the optical channel length.