SFP Transceiver Low Power Mode via TEC Switching

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Solution Overview

Problem

Small form-factor pluggable (SFP) optical transceivers face challenges in reducing power consumption while maintaining link functionality over shorter distances, as existing solutions do not effectively manage power delivery in low power modes without compromising transmission reach.

Innovation Solution

The method involves switching off the thermal electric cooler (TEC) of the SFP transceiver and adjusting the output target power to operate in a low power mode, allowing the transceiver to transmit over shorter distances with reduced power consumption, thereby supporting host platforms with lower power delivery budgets.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the thermal electric cooler (TEC) is switched off to reduce power consumption, then power consumption is reduced, but transmission distance is limited to shorter ranges

Engineering Contradiction:

Improvepower consumptionVSAvoidtransmission distance

Core Design Contradiction:

Use of energy by moving objectVSLength of moving object

Solution Approach 1:

The patent implements dynamic operation modes that allow the SFP transceiver to switch between different power and performance states. The transceiver can operate in high-power mode with TEC activated for long-distance transmission, or in low-power mode with TEC deactivated for shorter distances, optimizing the balance between power consumption and transmission distance based on actual network requirements

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the operational parameters of the transceiver by adjusting the TEC activation state and corresponding power settings. By modifying these parameters, the transceiver adapts its performance characteristics to match different transmission distance requirements, enabling low-power operation for short-reach applications while maintaining full capability for long-reach scenarios

Inventive Principle:

Principle #35Parameter changes

2Power

If the SFP transceiver operates in low power mode with reduced optical power, then power consumption is reduced, but reach distance is limited to 65 kilometers or less

Engineering Contradiction:

Improveoptical powerVSAvoidreach distance

Core Design Contradiction:

PowerVSLength of moving object

Solution Approach 1:

The patent applies partial action by deactivating the TEC and reducing optical power output only when full performance is not required. For short-reach applications (≤65km), the transceiver operates with reduced power to save energy, while reserving the capability to activate full power mode when longer transmission distances are needed, thus applying just the necessary level of power for each specific scenario

Inventive Principle:

Principle #16Partial or excessive action

3Device complexity

If firmware upgrades are used to enable low power mode operation, then hardware complexity is reduced, but configuration and management complexity increases

Engineering Contradiction:

Improvehardware changesVSAvoidconfiguration complexity

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

The patent implements self-service capabilities where the transceiver automatically detects transmission distance requirements and selects appropriate power modes without requiring manual configuration. The system monitors link characteristics and autonomously adjusts its operational state, eliminating the need for complex manual setup while maintaining the flexibility of firmware-based power mode control

Inventive Principle:

Principle #25Self-service

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 reduces overall power consumption of SFP transceivers, enabling them to maintain link functionality over shorter distances while supporting host platforms with lower power delivery capabilities, without the need for hardware changes, through firmware upgrades and proper power settings.

Implementation Method 1

switching off a thermal electric cooler (TEC) that controls a temperature of a laser diode of the SFP transceiver

Methodology Applied

Scientific EffectThermal electric cooler (TEC): Peltier Effect

Data Source

PatentUS8867924B2Low power consumption small form-factor pluggable transceiver

Publication Date: 2014.10.21 CISCO TECHNOLOGY INC

AI summary

A method is provided to lower the overall power consumption of small form-factor pluggable (SFP) transceivers. The method includes receiving an indication to operate the SFP transceiver in a low power mode, and setting the SFP transceiver to a low power mode in response to the indication by at least switching off a thermal electric cooler (TEC) that controls a temperature of a laser diode of the SFP transceiver. The proposed method may be implemented whenever a reach is not more than a predetermined distance, for example, 65 kilometers. At such reduced distances, the TEC of the SFP transceiver can be switched off while still guaranteeing link functionality. The instant low power mode has the benefit of reducing the power consumption of the SFP transceiver so that, for example, host platforms with lower power delivery budgets can support the SFP transceiver for at least some applications.