Optical Frequency Comb Clock Synchronization
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Solution Overview
Problem
Current systems for synchronizing remote clocks lack the precision and efficiency needed for sub-picosecond synchronization, particularly in distributed networks like satellite communications and electrical grids, where synchronization errors impact navigation and data correlation.
Innovation Solution
A system utilizing a reference oscillator to generate a femtosecond laser frequency comb, which is distributed through a network to remote nodes via multiplexers and noise cancellation systems, ensuring synchronized oscillations across remote clocks with sub-picosecond precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional clock synchronization methods are used, then system complexity is reduced, but synchronization precision deteriorates to above picosecond level
Solution Approach 1:
The patent replaces conventional electrical signal-based synchronization with optical frequency comb technology. Optical pulses are generated and distributed through optical fibers to remote clocks, enabling sub-picosecond precision timing. The optical frequency comb serves as a universal time reference that can be distributed over long distances with minimal interference, achieving high synchronization precision while managing system complexity through optical rather than electrical transmission.
Solution Approach 2:
The patent utilizes the unique properties of optical frequency combs, which consist of multiple discrete frequency components evenly spaced throughout the optical spectrum. By changing the reference parameter from conventional electrical oscillation to optical frequency combs with specific spacing (e.g., 100 MHz or 1 GHz), the system achieves improved synchronization precision. The optical pulses are modulated at these frequency combs and transmitted through optical fibers, enabling precise timing measurement and distribution.
2Measurement precision
If optical frequency comb distribution is implemented, then synchronization precision improves to sub-picosecond level, but signal transmission reliability deteriorates due to noise and interference
Solution Approach 1:
The patent introduces optical frequency combs as an intermediary carrier that encodes timing information. These combs serve as a universal reference that can be distributed through optical fiber networks to multiple remote clocks simultaneously. The frequency comb structure itself acts as the mediator, providing a stable, noise-resistant carrier that maintains timing precision over long distances. At each remote node, the optical frequency comb is converted to electrical signals for local clock synchronization.
Solution Approach 2:
The system employs feedback mechanisms where remote clocks continuously monitor their timing relative to the distributed optical frequency comb reference. Any timing deviations caused by noise or interference are detected and corrected through feedback loops that adjust the local clock frequencies to match the reference. This continuous feedback ensures maintained synchronization precision despite transmission challenges.
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 enables precise synchronization of remote clocks with sub-picosecond accuracy, reducing synchronization errors and enhancing the stability of timing signals in distributed networks, improving navigation and data transfer accuracy.
Implementation Method 1
generate a femtosecond laser frequency comb
Implementation Method 2
measuring a time delay between the local optical pulse and the remote optical pulse using an interferometer
Data Source
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AI summary
A method and a clock distribution node arranged to synchronize one or more remote clocks with a local clock. The clock distribution node calculates a first time offset between the local clock and the remote clock from an interference pattern between a spatially aligned local pulse sequence from the local clock and remote pulse sequence from the remote clock; receives a second time offset from a remote node; and applies a time offset value based on a difference between the first and second time offsets to the remote clock to synchronize the remote to the local clock, wherein the remote node is arranged to calculate the second time offset based from an interference pattern between a spatially aligned local pulse sequence from the local clock and remote pulse sequence from the remote clock.