Optical Sleep Wake Signaling for Low-Power Receiving Communication Units
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Solution Overview
Problem
Power receiving optical communication devices experience wasteful power consumption due to periodic sleep state cancellations, requiring time synchronization between OLT and ONU, leading to unnecessary startup and standby power usage.
Innovation Solution
An optical power supply system that transmits a sleep control signal with a shape corresponding to data time length or high noise resistance to cancel the sleep state of functional units in the power receiving device, using a signal detection unit and sleep control unit to manage the transition to an active state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sleep state is periodically cancelled to receive downlink data, then data reception is enabled, but wasteful startup and standby power are generated
Solution Approach 1:
The patent applies periodic action by using periodic preamble signals transmitted from the OLT to trigger sleep state cancellations in the ONU. The preamble is transmitted at regular intervals (e.g., every 100ms or 200ms) to wake up the ONU's receiving unit only when necessary, rather than maintaining continuous operation. This allows the system to balance between enabling data reception and reducing power consumption by keeping the receiving unit in sleep state during intervals when no data is transmitted.
2Ease of operation
If time synchronization is implemented between OLT and ONU for sleep control, then coordinated operation is achieved, but system complexity increases
Solution Approach 1:
The patent uses the periodic preamble signal as an intermediary mechanism to achieve time synchronization between OLT and ONU. The preamble serves as a common reference that both devices can use to align their operations without requiring complex bidirectional synchronization protocols. The ONU detects the preamble's arrival time and uses it to determine when to wake up and when to enter sleep state, simplifying the synchronization mechanism while maintaining coordinated operation.
3Speed
If receiving unit is kept active continuously, then data can be received immediately, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the receiving unit's operational state changeable between active and sleep modes based on incoming preamble signals. Instead of maintaining a static active state, the system dynamically transitions the receiving unit to sleep state after processing data, and only wakes it up again when a new preamble is detected. This dynamic state management enables the system to reduce standby power consumption while maintaining the ability to receive data immediately when needed.
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
Reduces power consumption in power receiving optical communication devices by only activating units when necessary, eliminating the need for periodic sleep state cancellations.
Implementation Method 1
an optical power supply unit 12 that transmits the optical signal for power supply to the power receiving optical communication device
Implementation Method 2
a power receiving optical communication device that is driven by power obtained from the optical signal for power supply transmitted from the power supply optical communication device
Data Source
AI summary
An optical power supply system, comprising: a power supply optical communication device that supplies power using an optical signal for power supply; and a power receiving optical communication device that is driven by power obtained from the optical signal for power supply transmitted from the power supply optical communication device, wherein the power supply optical communication device includes an optical power supply unit that transmits the optical signal for power supply to the power receiving optical communication device, when there is data to be transmitted to the power receiving optical communication device, transmit a sleep control signal having a shape corresponding to the time length of the data or having a shape with high noise resistance, to cancel a sleep state of a part of function units of the power receiving optical communication device, to the power receiving optical communication device, and the power receiving optical communication device includes a signal detection unit that detects the sleep control signal transmitted from the power supply optical communication device, and a sleep control unit that controls a functional unit in a sleep state to an active state according to the sleep control signal detected by the signal detection unit.