Photonics IC Heater Control for Extended Temperature Operation
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Solution Overview
Problem
Existing semiconductor die interconnects, particularly in AI computing, face inefficiencies due to high power consumption, pin count limitations, and latency issues with electrical interconnects, making it difficult to manage large data transfers between processor and memory chips.
Innovation Solution
The implementation of an Optical Multi-Die Interconnect Bridge (OMIB) that uses photonic signals to bridge semiconductor dies, allowing direct data transfer to the central memory region, reducing latency and power consumption by utilizing temperature-stabilized modulators and heaters to extend the operating temperature range of photonic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If electrical interconnects are used for data transfer between processor and memory chips, then data transfer can be achieved, but power consumption is high and latency is increased
Solution Approach 1:
The patent replaces electrical interconnects with optical interconnects using photonic devices. Light signals transmitted through waveguides between PICs enable data transfer with lower power consumption and reduced latency compared to traditional electrical copper interconnects, directly addressing the contradiction between energy efficiency and transfer speed.
Solution Approach 2:
The patent changes the fundamental parameter of signal transmission from electrical to optical domain. By using photonic integrated circuits that manipulate light rather than electricity, the system achieves both lower power consumption and higher data transfer speeds, resolving the trade-off between these two parameters.
2Adaptability or versatility
If electrical interconnects are used for data transfer, then connectivity is achieved, but pin count limitations restrict scalability
Solution Approach 1:
The patent substitutes electrical pin-based interconnects with optical waveguide-based interconnects. This replacement eliminates pin count limitations because optical signals can be multiplexed and routed through integrated waveguide structures without requiring proportional increases in physical connection points, thereby enabling scalable architectures.
Solution Approach 2:
The patent transitions from two-dimensional electrical pin arrays to three-dimensional optical waveguide routing within the PIC structure. This dimensional shift allows for complex interconnect topologies and higher connectivity density without increasing the physical footprint or pin count at the package level.
3Adaptability or versatility
If photonic devices operate at extended temperature ranges, then operational flexibility is improved, but temperature stabilization becomes more challenging
Solution Approach 1:
The patent modifies the operating parameters of photonic devices to tolerate broader temperature ranges. By designing modulators and photodetectors with temperature-compensated characteristics and using heater elements for active temperature control, the system extends its operational temperature range while maintaining performance specifications.
Solution Approach 2:
The patent implements temperature sensing and feedback control mechanisms within the PIC. Temperature sensors monitor the device temperature and feed this information back to control circuits that adjust heater power or modulator bias accordingly, actively stabilizing the operating temperature despite environmental variations.
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
OMIBs provide faster, lower power data transfer with reduced latency by using photonic signals, enabling efficient AI computing by directly connecting memory and compute elements within the die, overcoming the limitations of traditional electrical interconnects.
Implementation Method 1
a first device heater with a device heater power input; wherein the first device heater is located within three thousand nanometers (3,000 nm) from the first photonic device
Implementation Method 2
an Optical Multi-Die Interconnect Bridge (OMIB) that uses photonic signals to bridge semiconductor dies, allowing direct data transfer
Implementation Method 3
a photonic integrated circuit (PIC) coupled with the EIC including a first photonic device electrically coupled with the device interface
Data Source
AI summary
A package includes an electronic IC (EIC) coupled with a PIC at the top of the PIC. The EIC has a thermal controller, a signal interface, and a device interface. The PIC has a photonic device and a device heater. The device heater is located within 3,000 nm from the photonic device. The PIC receives heater power from the bottom of the PIC. A thermal controller in the EIC receives information of the temperature of the photonic device and controls the heater power applied to the device heater.