PHY Laser Burst-Mode Power Saving for Network Links
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Solution Overview
Problem
Modern communications networks face high energy costs due to inefficient power usage in IT infrastructure, particularly in network equipment, where existing technologies fail to effectively leverage the bursty nature of network traffic to minimize power consumption without impacting service quality.
Innovation Solution
Implementing burst-mode transmission in physical layer devices, which includes a data detector to control laser transitions based on the presence or absence of data, enabling the device to switch between on and off states independently of higher-layer protocols, thus reducing power consumption during idle periods without requiring significant changes to legacy systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous transmission mode is used to maintain network service quality, then reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements burst-mode transmission where the physical layer device alternates between active transmission periods and idle sleep periods. The laser is activated only during data bursts and remains off during idle periods, creating a periodic on-off pattern that reduces energy consumption while maintaining network service quality through timely wake-up and synchronization upon burst arrival.
2Use of energy by moving object
If burst-mode transmission is implemented to reduce power consumption, then energy efficiency is improved, but device complexity increases
Solution Approach 1:
The physical layer device autonomously detects the arrival of data bursts and independently controls laser activation without requiring complex coordination with higher-layer protocols. The device monitors its own idle periods, determines when to wake up, and manages its power state transitions, thereby reducing overall system complexity while achieving energy efficiency.
3Speed
If laser is kept on continuously to ensure immediate data transmission, then speed is improved, but use of energy increases
Solution Approach 1:
The device performs preliminary actions by maintaining synchronization information and wake-up capabilities during idle periods without keeping the laser continuously on. When a data burst is detected, the device is already prepared to transmit immediately, achieving fast response without the continuous energy cost of keeping the laser active throughout idle periods.
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 allows for significant energy savings in point-to-point links by utilizing the bursty nature of network traffic, maintaining network service quality, and expanding energy-saving features to legacy systems without the need for new device qualification, thus reducing overall energy costs.
Implementation Method 1
a laser for transmission of data over an optical network cable
Data Source
AI summary
A system, method and apparatus for power saving using burst-mode transmission over point-to-point physical connections. In one embodiment, a physical layer device (PHY) is provided that includes a data detector that is configured to generate a first control signal upon receipt of a non-idle code group over an interface between the PHY and a media access control (MAC) device and to generate a second control signal when all data received from the MAC device has been transmitted by the physical layer device. The PHY also includes a laser for transmission of data over an optical network cable, the laser being configured to perform a first transition from an off state to an on state based on the first control signal, and to perform a second transition from the on state back to the off state based on the second control signal.