Passive Phase Compensation Optical Frequency Transfer Device
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Solution Overview
Problem
Current optical frequency transfer systems rely on active phase compensation, which increases system complexity and reduces reliability due to the need for servo control units, limiting their effectiveness in achieving precise time frequency synchronization.
Innovation Solution
An optical frequency transfer device based on passive phase compensation using simple optical frequency mixing, microwave filtering, and frequency division processing, which eliminates the need for servo control units and simplifies the system structure while maintaining high reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If active phase compensation is used to compensate phase noise in optical frequency transfer, then phase stabilization is achieved, but system complexity increases and reliability decreases due to servo control units
Solution Approach 1:
The patent extracts and removes the servo control unit from the phase compensation system, replacing active compensation with a passive approach. The double-pass configuration extracts the phase noise information through optical frequency mixing and microwave filtering, achieving phase stabilization without requiring complex active control mechanisms.
Solution Approach 2:
The system uses the optical signal itself to carry and compensate the phase noise information. By sending the optical frequency signal through the transfer link twice (forward and backward passes), the system self-generates the phase noise signature that is then filtered and used for compensation, eliminating the need for external servo control systems.
2Measurement precision
If active phase compensation with servo control units is implemented, then phase noise is compensated, but system reliability is reduced
Solution Approach 1:
The servo control unit is completely removed from the system architecture. Instead of actively controlling phase compensation through feedback loops, the patent extracts phase noise information through passive optical frequency mixing and uses microwave filtering to compensate, thereby eliminating potential failure points associated with active control electronics.
Solution Approach 2:
The patent replaces the electronic servo control system with an optical-microwave processing system. Phase noise compensation is achieved through optical frequency mixing and microwave filtering rather than electronic feedback control, substituting a more reliable physics-based approach for electronics-based active control.
3Device complexity
If passive phase compensation is used with simple optical frequency mixing, then system structure is simplified and reliability is improved, but phase noise compensation capability must be maintained
Solution Approach 1:
The patent introduces microwave signals as an intermediary to bridge the optical frequency domain and enable phase noise extraction. Through optical frequency mixing between the forward and backward pass signals, microwave beat notes are generated that contain the phase noise information, which is then filtered and used for compensation.
Solution Approach 2:
The system employs periodic modulation through acousto-optic modulators to shift optical frequencies by microwave frequencies. This periodic action creates distinct spectral components that can be selectively filtered, enabling the extraction and compensation of phase noise through the periodic beating of forward and backward pass signals.
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
The solution achieves phase-stabilized optical frequency transfer with a simple system structure and high reliability, enabling precise time frequency synchronization by extracting and compensating phase noise through passive phase compensation methods.
Implementation Method 1
a first acousto-optical frequency shifter (13)... a second acousto-optical frequency shifter (20)
Implementation Method 2
a first Faraday rotator mirror (12)... a second Faraday rotator mirror (22)
Implementation Method 3
an photoelectric conversion unit (14)... a second photoelectric conversion unit (26)
Data Source
AI summary
An optical frequency transfer device based on passive phase compensation and a transfer method are provided, where the device comprises a local side, a transfer link and a user side. Optical frequency transfer based on passive phase compensation is achieved by simple optical frequency mixing, microwave filtration, and frequency division processing in a passive phase compensation manner, and the device has simple system structure and high reliability.