Laser Driver Power Control for PON Link Status
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Solution Overview
Problem
Laser drivers in passive optical networks dissipate approximately the same amount of power regardless of whether they are transmitting meaningful data, leading to inefficiencies in power usage due to the inability to accurately predict when internal circuitry can be powered down.
Innovation Solution
Implementing a power control scheme in laser drivers that uses a media access control (MAC) module aware of the expected transmission schedule to power down the laser driver when no data is being transmitted, allowing for efficient power conservation without modifying standardized protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the laser driver continuously operates to maintain readiness for data transmission, then the response time for transmitting data is improved, but the power consumption increases
Solution Approach 1:
The laser driver enters a low-power state in advance when no data transmission is expected, and quickly transitions back to full operation when data needs to be transmitted. The system maintains the ability to respond immediately when needed while conserving power during idle periods.
Solution Approach 2:
The laser driver dynamically adjusts its operational state based on transmission needs, switching between full-power transmission mode and low-power standby mode. This dynamic adaptation allows the system to optimize power consumption while maintaining readiness for data transmission.
2Use of energy by moving object
If the laser driver powers down internal circuitry to save power during idle periods, then the power consumption is reduced, but the ability to accurately predict transmission timing is required
Solution Approach 1:
A prediction mechanism acts as an intermediary between the idle state detection and the power down decision. This mechanism analyzes transmission patterns and predicts when data transmission will occur, enabling the laser driver to safely enter low-power mode without compromising transmission readiness.
Solution Approach 2:
The system uses feedback from transmission history and allocation maps to predict future transmission timing. This feedback loop allows the laser driver to make informed decisions about when to power down and when to remain active, optimizing power consumption while maintaining reliability.
3Reliability
If the laser driver maintains constant power dissipation to ensure readiness, then the reliability of data transmission is improved, but the power efficiency deteriorates
Solution Approach 1:
The laser driver operates in periodic bursts, alternating between active transmission periods and low-power idle periods. During allocated transmission windows, the driver operates at full power to ensure reliable data transmission. During non-allocated periods, it enters low-power mode, achieving both reliability during transmission and efficiency during idle time.
Solution Approach 2:
The system changes operational parameters (power dissipation level) based on transmission allocation. When transmission is allocated, the laser driver operates at high power with parameters optimized for reliable data transmission. When no transmission is allocated, parameters are changed to reduce power consumption while maintaining the ability to quickly resume transmission.
Data Source
AI summary
Systems and methods are provided to efficiently manage power in a laser a driver of an optical network unit (ONU) of a passive optical network (PON). Using information from an allocation map, the expected next allocated schedule for a transmission can be determined. The driver can be efficiently powered down and powered up based on the time remaining between the end of the current burst and the beginning of the next expected burst so that power is not wasted while the laser has no data to transmit.