Optical Engine Packaging for Short-Reach ASIC Interconnects
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Solution Overview
Problem
Optical transceivers in communication systems are physically large and consume significant power due to electrical communication over long distances, limiting system density in high-speed applications like 12, 25, and 50 Tb/s systems.
Innovation Solution
A compact optical engine system with integrated electro-optical chips and circuits, including a photodetector and optical modulator, connected via short electrical connections and a reworkable interface, which simplifies circuitry and reduces power consumption by using PAM-4 signaling and a management circuit to manage multiple optical engines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If optical transceivers are placed far away from host or switch ASIC to enable optical communication, then communication reach is improved, but physical size and power consumption increase significantly
Solution Approach 1:
The optical transceiver system is segmented into separate functional modules: optical engine, host ASIC, and intermediate electrical interface circuits. This segmentation allows each component to be optimized independently, with the optical engine positioned close to the ASIC to minimize electrical connection length and power consumption while maintaining optical communication reach.
Solution Approach 2:
An intermediate electrical interface is introduced between the optical engine and host ASIC, consisting of separate transmit and receive electrical circuits. This intermediary enables the optical engine to be positioned close to the ASIC, reducing electrical connection losses and power consumption while still achieving long-distance optical communication.
2Speed
If optical transceivers are placed far away from host or switch ASIC, then communication reach is improved, but system density is reduced
Solution Approach 1:
The system is divided into compact modular components that can be densely packed. The optical engine is integrated close to the host ASIC with minimal electrical interconnects, enabling high system density while maintaining long-distance optical communication capability through the optical interface.
Solution Approach 2:
The system transitions from electrical signal transmission to optical signal transmission, utilizing a different dimension (optical domain) for long-distance communication. This allows the physical components to be compact and densely packed while achieving extended communication reach through the optical interface.
3Speed
If traditional electrical communication is used over long distance, then communication reach is improved, but power consumption and signal loss increase
Solution Approach 1:
The system replaces long-distance electrical signal transmission with optical signal transmission. Electrical signals are generated only for short distances within the optical engine and host ASIC, then converted to optical signals for long-distance transmission, eliminating electrical signal loss over long distances and reducing overall power consumption.
Solution Approach 2:
Electrical-to-optical conversion circuits serve as intermediaries, converting electrical signals to optical signals after minimal electrical transmission. This intermediary conversion enables the system to achieve long communication reach with minimal electrical signal loss by limiting electrical transmission to short distances only.
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 optical engine system achieves high-speed data exchange with low signal loss, reduces power consumption, and allows for easy replacement or upgrading of optical engines, enhancing system density and performance in high-speed communication systems.
Implementation Method 1
The first electro-optical chip includes a photodetector
Implementation Method 2
the second electro-optical chip including an optical modulator
Data Source
AI summary
A system including an optical engine. In some embodiments, the system includes an integrated circuit in a first-level package, and the system includes the optical engine, in the first-level package, and the optical engine includes an electro-optical chip.