Vertical-Coupled EO Modulator With Integrated Laser Coupling
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Solution Overview
Problem
Long-haul telecommunication networks, data center optical interconnects, and microwave photonic systems face increased system costs and reduced stability and scalability due to lasers functioning as standalone units separate from electro-optic modulators.
Innovation Solution
Integration of a laser and electro-optic modulator, primarily based on lithium niobate, onto a unified vertical coupling platform, utilizing a hetero-integrated electro-optic modulator with a thin lithium niobate film bonded to a silicon photonics platform, enabling seamless integration with the laser on a shared vertical coupling platform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If lasers function as standalone units separate from modulators, then ease of manufacture is improved, but system cost increases and stability and scalability are reduced
Solution Approach 1:
The patent merges the laser and electro-optic modulator into a single integrated device structure. The laser gain medium is positioned within the same device housing as the modulator crystal, with optical coupling achieved through direct physical integration. This combining eliminates the need for separate standalone units while maintaining manufacturability through a unified device architecture that allows simultaneous fabrication of both components.
Solution Approach 2:
The integrated device serves multiple functions within a single structure: the laser gain medium generates optical radiation while the modulator crystal simultaneously modulates this radiation based on applied electrical signals. This multi-functional integration improves stability by ensuring consistent optical coupling between components and enables scalable deployment across different system configurations without requiring separate manufacturing processes.
2Ease of manufacture
If lasers function as standalone units separate from modulators, then ease of manufacture is improved, but system cost increases
Solution Approach 1:
The patent combines laser and modulator functions into a single integrated device, reducing the total number of components that need to be manufactured, handled, and assembled. This integration lowers system cost by eliminating separate procurement and assembly processes while maintaining ease of manufacture through a unified device structure that can be fabricated using established techniques for both laser and modulator components.
3Device complexity
If lasers function as standalone units separate from modulators, then device complexity is reduced, but stability and scalability are reduced
Solution Approach 1:
The integration of laser and modulator into a single device improves stability by ensuring fixed, precise optical coupling between components that would be difficult to maintain in separate units. The unified structure eliminates alignment drift and coupling losses associated with separate components, while the device complexity remains manageable through modular design principles that allow independent optimization of each functional element within the integrated structure.
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 integration enhances high-powered telecommunication systems, facilitates fully integrated spectrometers, and supports efficient frequency conversion for quantum networks, improving stability and scalability.
Implementation Method 1
an optical modulation waveguide configured to modulate an optical signal with a received radio frequency (RF) signal to generate a modulated optical signal
Implementation Method 2
an input waveguide configured to receive the optical signal in a substantially horizontal direction, and redirect the optical signal in a vertical direction towards the optical modulation waveguide
Implementation Method 3
an output waveguide configured to receive the modulated optical signal in the vertical direction, and redirect the modulated optical signal in the substantially horizontal direction
Data Source
AI summary
An integrated electro-optic (EO) modulator implemented on a vertical coupling platform. It features inverse taper mode converters to match spot sizes with lasers or optical fibers, microreflectors for redirecting optical paths, and microlenses for coupling to and from modulator waveguides. The modulator may be either a bulk LiNbO3 modulator or a hybrid thin-film LiNbO3 modulator, where an electro-optical modulation layer is bonded to a cladding layer overlying a substrate. A modulation zone waveguide is optically coupled to the electro-optical modulation layer and integrated with the waveguiding structure embedded in the cladding layer.