Femtosecond Laser Pulse Distribution for Sub-Picosecond Clock Synchronization
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Solution Overview
Problem
Current clock synchronization technologies, particularly for advanced clocks like optical clocks, face challenges in distributing precise timing signals with sub-picosecond accuracy across remote devices and systems, leading to limitations in navigation accuracy, data correlation, and stability in electrical grids.
Innovation Solution
A system utilizing a femtosecond laser stabilized by a reference oscillator to generate a femtosecond laser pulse sequence, which is split and distributed to remote nodes, enabling precise timing synchronization through a network of beamsplitters and transfer lasers, ensuring consistent frequency references across remote clocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional clock synchronization technologies are used, then system complexity is reduced, but timing synchronization precision deteriorates and cannot achieve sub-picosecond accuracy
Solution Approach 1:
The patent introduces femtosecond laser pulses as an intermediary carrier to transfer timing information between remote clocks. These optical pulses serve as a precise temporal reference that can be distributed over long distances through optical fibers, enabling sub-picosecond synchronization without requiring direct connection between clocks. The laser pulses act as a mediator that carries timing information while maintaining precision across the distribution network.
Solution Approach 2:
The patent replaces conventional electrical signal-based synchronization systems with optical-based femtosecond laser pulse systems. This substitution transitions from electrical domain to optical domain, achieving significantly higher precision. The femtosecond laser pulses provide a more stable and precise timing reference compared to traditional electrical signals, enabling sub-picosecond accuracy while distributing timing information across remote nodes.
2Stability of the object's composition
If optical clocks with higher frequency are used, then clock stability is improved, but distribution and synchronization across remote elements becomes more difficult
Solution Approach 1:
The patent uses femtosecond laser pulses as an intermediary to distribute the high-frequency optical clock signal to remote nodes. The laser pulses carry the precise timing information from the master optical clock to multiple remote clocks through optical fiber networks. This intermediary approach allows the high-stability optical clock signal to be distributed over long distances while maintaining sub-picosecond synchronization accuracy across the network.
Solution Approach 2:
The patent segments the optical clock distribution system into a master clock node and multiple remote nodes, each equipped with frequency comb devices. The master clock generates the reference optical signal, which is then distributed to remote nodes where local frequency combs convert the optical signal to microwave frequencies for local clock synchronization. This segmentation allows each node to operate semi-independently while maintaining overall network synchronization.
3Measurement precision
If precise timing signals are distributed over long distances, then navigation accuracy and data correlation are improved, but timing signal stability deteriorates due to transmission losses
Solution Approach 1:
The patent employs periodic femtosecond laser pulse trains as the timing signal carrier. These periodic pulses are generated at the master clock and distributed to remote nodes through optical fibers. The periodic nature of the pulse train provides a stable temporal reference that can withstand transmission losses over long distances. Each pulse serves as a precise timing marker, and the regular interval between pulses maintains synchronization accuracy even after long-distance transmission.
Solution Approach 2:
The patent replaces electrical signal transmission with optical fiber transmission of femtosecond laser pulses. This substitution to the optical domain provides several advantages: optical signals experience lower attenuation over long distances compared to electrical signals, optical fibers provide better isolation from electromagnetic interference, and the high frequency of optical carriers enables more precise timing measurements. This substitution maintains timing signal stability while distributing precise timing over long distances for improved navigation accuracy.
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 solution achieves enhanced synchronization and distribution of precise timing signals with sub-picosecond accuracy, improving navigation and data correlation while maintaining stability across remote systems, even over long distances.
Implementation Method 1
a femtosecond laser configured to produce a femtosecond laser pulse sequence stabilized by the reference oscillator
Implementation Method 2
at least one beamsplitter configured to split the femtosecond laser pulse sequence into one or more split laser pulse sequences
Implementation Method 3
a femtosecond laser configured to produce a femtosecond laser pulse sequence
Data Source
AI summary
A system for distributing a reference oscillator signal includes a clock having a reference oscillator and a femtosecond laser stabilized by the reference oscillator. The system also includes at least one beamsplitter configured to split the femtosecond laser. The system further includes one or more remote nodes that are spaced from the clock. The remote nodes are configured to generate reference signals based on the split femtosecond laser.