QSFP-DD Optical Transceiver Layout Without MLG Gearboxes
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Solution Overview
Problem
Existing pluggable optical transceiver modules face challenges in supporting high data rates and port densities without the need for complex MLG gearboxes, which increase power consumption, cost, and complexity, and are not widely supported by current Ethernet PHY devices.
Innovation Solution
The QSFP-DD optical transceiver module is configured for 8×10 Gb/s breakout, eliminating the need for MLG gearboxes by doubling the electrical lanes to 8, supporting independent 10 GbE channels, and using a larger form factor for simpler circuitry and lower power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MLG gearboxes are used to support high data rates and port densities, then data communication capability is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent removes the MLG gearbox component entirely from the system. By using a QSFP-DD form factor with 8 native electrical lanes directly connected to 8 optical ports, the complex MLG gearboxing mechanism is extracted and eliminated, achieving high port density without the associated complexity and power consumption.
2Productivity
If MLG gearboxes are used to support high data rates and port densities, then data communication capability is improved, but power consumption increases
Solution Approach 1:
The MLG gearbox, which is a major power consumer, is completely removed from the system architecture. The direct connection of 8 electrical lanes to 8 optical ports eliminates the need for gearboxing operations, thereby significantly reducing power consumption while maintaining high data communication capability.
3Productivity
If MLG gearboxes are used to support high data rates and port densities, then data communication capability is improved, but thermal management becomes more difficult
Solution Approach 1:
By eliminating the MLG gearbox component, the primary heat-generating element is removed from the system. The simplified architecture with direct electrical lane connections generates less heat, making thermal management significantly easier while still supporting high data rates and port densities.
4Quantity of substance
If QSFP-DD form factor with 8 electrical lanes is used, then port density is improved, but compatibility with existing 4-lane QSFP modules decreases
Solution Approach 1:
The patent transitions from a 4-lane QSFP form factor to an 8-lane QSFP-DD form factor, effectively doubling the port density by utilizing an enhanced dimensional capacity. This represents a generational evolution in the form factor specification, allowing 8 independent 10GbE ports while maintaining electrical lane integrity.
Data Source
AI summary
A QSFP-DD optical transceiver module having more than four optical data ports and more than four electrical data ports is configured for approximately 10 Gb/s bidirectional data communication on each of the data ports, and is further configured to communicatively inter-connect each of the optical data ports thereof to a corresponding one of the electrical data ports thereof. The module may be used with a digital data router or switch having at least one QSFP-DD receptacle with eight electrical data ports and configured for parallel bidirectional communication with the QSFP-DD module plugged therein over at least five of the eight electrical data ports at 10 Gb/s per port and direction.