Multi-Laser Wavelength Interval Control Using Beat Frequency Feedback
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Solution Overview
Problem
Existing optical communication systems using multiple light sources face challenges in uniformly maintaining wavelength intervals, leading to issues such as energy loss, high optical signal-to-noise ratio, and complexity due to the use of optical combs or multi-wavelength light sources, which require additional components and generate noise.
Innovation Solution
An apparatus and method that includes a controller to detect frequency components from electrical signals and control the wavelength of each light source to maintain a uniform interval, using optical couplers and light reception units to combine and process the light signals, and optionally modulating signals to reduce bandwidth requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If optical combs or multi-wavelength light sources are used to maintain wavelength intervals, then wavelength uniformity is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements a feedback control system where the wavelength interval of multiple light sources is continuously monitored and adjusted. A controller receives wavelength information from each light source, calculates the intervals between adjacent wavelengths, and generates control signals to adjust the light sources' wavelengths to maintain uniform intervals. This closed-loop feedback mechanism replaces complex optical components with a simpler electronic control system.
Solution Approach 2:
The patent replaces optical mechanisms (optical combs, multi-wavelength light sources) with electronic control mechanisms. Instead of using physical optical components to enforce wavelength spacing, the system uses electronic controllers to detect and adjust wavelengths, substituting mechanical/optical systems with electronic ones to reduce complexity.
2Manufacturing precision
If optical combs or multi-wavelength light sources are used to maintain wavelength intervals, then wavelength uniformity is improved, but cost increases
Solution Approach 1:
The patent implements a feedback control system where the wavelength interval of multiple light sources is continuously monitored and adjusted. A controller receives wavelength information from each light source, calculates the intervals between adjacent wavelengths, and generates control signals to adjust the light sources' wavelengths to maintain uniform intervals. This closed-loop feedback mechanism replaces complex optical components with a simpler electronic control system.
Solution Approach 2:
The patent replaces optical mechanisms (optical combs, multi-wavelength light sources) with electronic control mechanisms. Instead of using physical optical components to enforce wavelength spacing, the system uses electronic controllers to detect and adjust wavelengths, substituting mechanical/optical systems with electronic ones to reduce complexity.
3Measurement precision
If high-bandwidth photodiodes are used to process combined light signals, then signal detection capability is improved, but cost increases
Solution Approach 1:
The patent extracts and processes only the necessary frequency components from the combined light signal. Instead of requiring the photodiode to handle the full bandwidth of all wavelength components simultaneously, the system identifies and processes specific frequency intervals corresponding to wavelength differences, reducing the bandwidth requirement of the photodiode while maintaining detection capability.
Solution Approach 2:
The patent applies partial action by processing only the relevant frequency components needed for wavelength interval measurement rather than the complete signal spectrum. The system focuses on detecting specific frequency differences between adjacent wavelengths, using partial signal processing to achieve the measurement goal with lower-cost, lower-bandwidth components.
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 effectively maintains uniform wavelength intervals, reduces bandwidth needs, and prevents increases in costs associated with high-bandwidth photodiodes, while utilizing free-running light sources for efficient energy management and high optical signal-to-noise ratio.
Implementation Method 1
a light reception unit configured to receive an optical signal in which at least some of the output light of each of the plurality of light sources is combined and output an electrical signal including a frequency component corresponding to the certain wavelength interval
Data Source
AI summary
An apparatus and method for maintaining a wavelength interval of light sources are disclosed. The apparatus for maintaining a wavelength interval of light sources includes: a plurality of light sources configured to output light having different wavelengths and having a certain wavelength interval; a light reception unit configured to receive an optical signal in which at least some of the output light of each of the plurality of light sources is combined and output an electrical signal including a frequency component corresponding to the certain wavelength interval; and a controller configured to detect the frequency component corresponding to the certain wavelength interval from the electrical signal and control a wavelength of each of the plurality of light sources to maintain the certain wavelength interval based on the detected frequency component.