Wavelength Adaptive Optical Module Beat Frequency Feedback
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Solution Overview
Problem
Narrow-linewidth tunable lasers used in coherent optical communication systems experience frequency shifts over time, leading to increased optical frequency deviations with the local oscillator, requiring high-precision temperature or current control, which is difficult and expensive to maintain.
Innovation Solution
A wavelength adaptive optical module that includes a local oscillator laser, a receiving module, a mixing module, and a digital signal processing module to calculate and adjust the local oscillator light frequency based on the beat frequency signal, using a feedback control loop to maintain the frequency difference within a small range, thereby reducing the need for high-frequency accuracy and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If narrow-linewidth tunable lasers are used as local oscillators in coherent optical communication systems, then the frequency precision and stability are improved, but the device complexity and manufacturing cost increase due to high-precision temperature control or current control capabilities being required
Solution Approach 1:
The patent implements a feedback control mechanism where the digital signal processing module continuously monitors the frequency of the local oscillator light through beat frequency signal analysis and automatically adjusts the local oscillator laser parameters. This closed-loop feedback system maintains frequency precision without requiring complex preemptive control hardware, as the system self-corrects frequency deviations in real-time based on actual performance measurements.
Solution Approach 2:
The system enables the local oscillator to self-adjust its frequency through the feedback control loop, where the digital signal processing module autonomously detects frequency deviations and generates correction signals. This self-service mechanism eliminates the need for external high-precision control systems, allowing the local oscillator to maintain its own frequency stability through intelligent self-regulation based on real-time performance monitoring.
2Stability of the object's composition
If narrow-linewidth tunable lasers are used as local oscillators, then the frequency stability is improved, but the manufacturing cost increases due to difficult and expensive manufacturing processes
Solution Approach 1:
The patent replaces complex mechanical control systems (temperature control, current control) with a digital signal processing-based feedback mechanism. Instead of using precision mechanical components to maintain frequency stability, the system uses electronic signal processing and software-based control algorithms to detect and correct frequency deviations, significantly simplifying the manufacturing process while maintaining frequency stability.
Solution Approach 2:
The system dynamically adjusts the operating parameters of the local oscillator laser (such as injection current or temperature) based on real-time frequency measurements. By changing these parameters adaptively through the feedback control loop, the system maintains frequency stability without requiring the laser to be manufactured with extremely tight initial tolerances, thereby reducing manufacturing complexity and cost.
3Stability of the object's composition
If high-precision temperature control or current control capabilities are implemented, then the frequency stability is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent implements a feedback control mechanism where the digital signal processing module continuously monitors the frequency of the local oscillator light through beat frequency signal analysis and automatically adjusts the local oscillator laser parameters. This closed-loop feedback system maintains frequency precision without requiring complex preemptive control hardware, as the system self-corrects frequency deviations in real-time based on actual performance measurements.
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 optical module adjusts the local oscillator light frequency in real time to match the input light signal, implementing wavelength adaptation and reducing the requirements for frequency precision and stability of the input light, enhancing the performance of coherent optical communication systems.
Implementation Method 1
a mixing module configured to mix the input light signal and the local oscillator light signal to obtain a beat frequency signal
Implementation Method 2
a digital signal processing module at least configured to calculate a beat frequency signal frequency of the beat frequency signal
Data Source
AI summary
Provided in the present disclosure are an optical module, a wavelength adaptive coherent optical communication method, and a computer storage medium, the optical module comprising: a local oscillator laser, used for outputting local oscillator light; a receiving module, used for receiving an input light signal and a local oscillator light signal; a mixing module, used for mixing the input light signal and the local oscillator light signal to obtain a beat frequency signal; and a digital signal processing module, at least configured to be used for calculating the beat frequency signal frequency and, by means of a feedback control loop, adjusting the local oscillator light frequency outputted by the local oscillator laser according to the beat frequency signal frequency.