Integrated Photonic Power Distribution Network for Liquid-Cooled Datacenters
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Solution Overview
Problem
Current photonic circuits face challenges in achieving efficient optical power distribution with a large number of channels and high optical power output, leading to increased costs and cooling requirements, while also experiencing optical insertion losses and crosstalk due to the need for multiple laser sources and complex switch configurations in datacenters.
Innovation Solution
The integration of multiple light sources, such as InP dies, onto a single silicon photonic chip with optimized waveguide arrangements that minimize optical insertion loss and crosstalk, allowing for fewer laser sources and improved thermal management, enabling efficient optical power distribution and reduced cooling needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate laser packages are used to provide multiple wavelengths, then wavelength diversity is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple laser sources emitting different wavelengths onto a single integrated photonic chip. The waveguides on the chip collect and guide light from multiple laser sources, merging their functions into one unified device. This eliminates the need for multiple separate laser packages while maintaining wavelength diversity, directly resolving the contradiction between adaptability and device complexity.
2Adaptability or versatility
If multiple laser sources are used for high-end multiplexing, then wavelength-division multiplexing capability is improved, but the number of components and cost increase
Solution Approach 1:
The photonic chip is designed as a universal platform that can handle multiple wavelengths simultaneously through its waveguide structure. The waveguides are configured to collect and distribute light from multiple laser sources with different wavelengths to a single output fiber, making the device multi-functional and eliminating the need for separate components for each wavelength channel.
3Reliability
If early laser packages with fiber pigtail are used, then optical connection is achieved, but the system becomes bulky and compact distribution is impossible
Solution Approach 1:
The patent transitions from three-dimensional bulk optical components to a two-dimensional integrated photonic circuit plane. The waveguides are etched directly into the chip substrate, creating a planar light distribution network that replaces the bulky three-dimensional arrangement of separate laser packages and fiber pigtails. This dimensional transformation enables compact integration while maintaining optical connection reliability.
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 reduces the number of laser sources required, decreases costs, and enhances optical power output while maintaining high channel counts, accommodating dense photonic circuitry and allowing operation at reduced temperatures, thus optimizing datacenter performance without the need for liquid cooling.
Implementation Method 1
a plurality of waveguides formed in a single optical layer of the photonic substrate, each waveguide having a proximate end and a distal end
Implementation Method 2
a photonic substrate having a plurality of cavities adapted to receive respective light sources
Data Source
AI summary
Photonic circuits are disclosed having an efficient optical power distribution network. Laser chips (InP) having different wavelengths are flip-chip assembled near the center of a silicon photonic chip. Each InP die has multiple optical lanes, but a given die has only one wavelength. Waveguides formed in the photonic chip are optically connected to the lanes, and fan out to form multiple waveguide sets, where each waveguide set has one of the waveguides from each of the different wavelengths, i.e., one waveguide from each InP die. The waveguide network is optimized to minimize the number of crossings that any given waveguide may have, and no waveguide having a particular wavelength crosses another waveguide of the same wavelength. The unique arrangements of light sources and waveguides allows the use of a smaller number of more intense laser sources, particularly in applications such as performance-optimized datacenters where liquid cooling systems may be leveraged.