Optical Frequency Comb Generation in a Thermally Stable Brillouin Cavity
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Solution Overview
Problem
Current optical frequency combs generated based on nonlinear optical resonant cavities suffer from high noise levels and instability due to thermal effects, which disrupt the non-thermally stable state required for their operation.
Innovation Solution
A method and apparatus that aligns a pump laser with a thermally stable state of a nonlinear optical resonant cavity, adjusting the cavity's Brillouin gain to coincide with a target longitudinal mode, allowing for continuous generation of a Brillouin laser and subsequent optical frequency comb through a Kerr nonlinear four-wave mixing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an optical frequency comb is generated based on a nonlinear optical resonant cavity in a non-thermally stable state, then the frequency interval can cover a wide frequency range, but the noise level increases and the optical soliton state becomes unstable due to thermal effects
Solution Approach 1:
The patent changes the thermal state parameter of the resonant cavity from non-thermally stable to thermally stable state. By operating the resonant cavity in its thermally stable state, the system maintains optical soliton state stability and reduces noise while still achieving wide frequency interval coverage through the nonlinear optical resonant cavity's inherent characteristics.
2Device complexity
If an optical frequency comb is generated in a non-thermally stable state, then the generation process can proceed without thermal stabilization, but the quantum noise increases and the system becomes sensitive to thermal disturbances
Solution Approach 1:
The patent changes the thermal state parameter from non-thermally stable to thermally stable state. This parameter change reduces quantum noise and makes the system less sensitive to thermal disturbances, improving measurement precision while maintaining reasonable system complexity through the resonant cavity's inherent thermal stability characteristics.
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 approach results in an optical frequency comb with improved stability, reduced quantum noise, and narrower linewidth, maintaining a self-stabilized state resistant to thermal disturbances and frequency jitter.
Implementation Method 1
adjusting the nonlinear optical resonant cavity, such that a Brillouin gain corresponding to the pump laser coincides with a target longitudinal mode in the nonlinear optical resonant cavity; continuously generating a Brillouin laser at the target longitudinal mode
Implementation Method 2
generating an optical frequency comb including optical solitons by using the Brillouin laser through a Kerr nonlinear four-wave mixing process
Data Source
AI summary
The present disclosure discloses a method and apparatus for generating an optical frequency comb. The specific generation method comprises: receiving a pump laser that matches a thermally stable state of a nonlinear optical resonant cavity and causing the pump laser to oscillate in the nonlinear optical resonant cavity, such that a Brillouin gain corresponding to the pump laser coincides with a target longitudinal mode in the nonlinear optical resonant cavity; continuously generating a Brillouin laser at the target longitudinal mode in the case that a pump power of the pump laser exceeds a threshold for generating the Brillouin laser; and generating an optical frequency comb by using the Brillouin laser through a Kerr nonlinear four-wave mixing process. According to the technical solution of the present disclosure, the nonlinear optical resonant cavity with the Brillouin gain can generate an optical frequency comb in its thermally stable region. This optical frequency comb not only has good stability, but also has low quantum noise and narrow linewidth characteristics.