Optically Enabled Multi-Chip Modules for Thermal and Manufacturing Contradictions
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Solution Overview
Problem
Multi-chip modules face communication bottlenecks when interfacing with external devices due to limitations in high-speed optical fiber implementations, particularly concerning thermal isolation, optical signal noise reduction, and manufacturing considerations for optical transmitter and receiver components.
Innovation Solution
The integration of optically enabled multi-chip modules with wavelength and space division multiplexed transceivers, featuring optical engine front-ends and macros that include laser diodes, amplifier circuitry, and photodiodes, along with advanced digital signal processing capabilities, to facilitate high-speed optical communication through multiple optical fibers or a single fiber using SWDM and SDM techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high speed optical fiber communications are implemented on multi-chip modules, then communication speeds between chips and external devices are improved, but thermal management becomes more difficult due to heat generation from optical transmitter and receiver components
Solution Approach 1:
The patent divides the multi-chip module into functionally separate chips: optical transmitter chips, optical receiver chips, and host system chips. Each chip is optimized for its specific function, allowing thermal management to be addressed independently for each component rather than as a unified system, thus resolving the thermal management challenge while maintaining high communication speeds.
Solution Approach 2:
The patent introduces intermediate structures such as substrate layers, encapsulants, and heat dissipation structures that act as thermal intermediaries between the optical components and the environment. These intermediaries facilitate heat transfer and distribution, enabling effective thermal management of the high-speed optical communication components.
2Speed
If optical transmitter and receiver components are integrated on multi-chip modules, then communication speeds are improved, but manufacturing and testing complexity increases
Solution Approach 1:
The patent segments the optical communication system into separate transmitter and receiver chips that can be manufactured independently using standardized processes. This segmentation allows each chip type to be produced in volume using established semiconductor manufacturing techniques, reducing overall manufacturing complexity compared to integrating all functions on a single chip.
Solution Approach 2:
The patent designs the optical transmitter and receiver chips with universal interfaces and standardized mounting procedures that can be applied across different multi-chip module configurations. This universality simplifies manufacturing and testing by allowing the same processes to be used regardless of the specific application or number of chips involved.
3Productivity
If multiple optical fibers are used for communication, then communication bandwidth is improved, but device complexity increases
Solution Approach 1:
The patent transitions from single-fiber communication to multi-fiber communication by adding spatial dimensionality to the optical interface. Multiple optical fibers are arranged in parallel, each carrying independent data channels, thereby increasing bandwidth while maintaining relatively simple individual fiber connections that can be managed through standardized multi-fiber assembly techniques.
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 solution enhances communication speeds and reduces bottlenecks by enabling efficient optical communication with external devices, improving thermal management, signal integrity, and manufacturing feasibility through the use of advanced optical engine components and multiplexing techniques.
Implementation Method 1
optical engine front-ends and macros that include laser diodes
Implementation Method 2
optical engine front-ends and macros that include laser diodes, amplifier circuitry, and photodiodes
Data Source
AI summary
An optically enabled multi-chip module has an optical engine transceiver and a host system chip. The optical engine transceiver has an optical engine front-end and an optical engine macro. The optical engine front-end has multiple laser diodes, laser driver circuitry electrically interfaced with each of the laser diodes, multiple photodiodes, amplifier circuitry electrically interfaced with each of the photodiodes, and at least one optical element optically positioned between the laser diodes and at least one optical fiber and between the photodiodes and the at least one optical fiber. The at least one optical element optically interfaces the laser diodes and photodiodes with the optical fiber. The optical engine macro is both electrically interfaced with and physically segregated from the optical engine front-end. The optical engine macro provides a subset of optical transceiver functionality to the optical engine front-end. The host system chip is electrically interfaced with the optical engine transceiver.