Chromatic Dispersion Compensation Controller for Optical Receivers
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Solution Overview
Problem
In optical communication systems, setting the optimal compensation value for chromatic dispersion is time-consuming when using methods based on the number of corrections, and analog clock recovery is challenging in digital coherent receivers due to large chromatic dispersion.
Innovation Solution
A signal processing circuit with a chromatic dispersion compensation controller that adjusts compensation values based on the detected phase offset between the sampling signal and modulation frequency, using digital electrical signals to effectively compensate for chromatic dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chromatic dispersion compensation is performed using methods based on the number of corrections or analog clock recovery, then chromatic dispersion can be compensated, but the process becomes time-consuming and complex
Solution Approach 1:
The patent replaces analog clock recovery mechanisms with digital signal processing. Specifically, it uses digital electrical signals obtained by sampling analog electrical signals through A/D conversion, and performs chromatic dispersion compensation using digital filtering and phase offset detection algorithms, thereby eliminating the time-consuming analog recovery process while maintaining compensation accuracy
Solution Approach 2:
The patent implements automatic chromatic dispersion compensation by using the received optical signal itself as the reference. The system detects phase offset between the sampling signal and modulation frequency directly from the received signal, and automatically adjusts compensation values without requiring external calibration signals or manual intervention, thus reducing compensation setting time
2Reliability
If analog clock recovery is used for chromatic dispersion compensation, then dispersion can be compensated, but the system becomes complex and difficult to implement in digital coherent receivers
Solution Approach 1:
The patent substitutes analog clock recovery circuits with digital signal processing components. The system uses A/D converted digital electrical signals and implements chromatic dispersion compensation through digital filtering operations and phase offset detection algorithms, thereby simplifying the receiver architecture while achieving effective dispersion compensation in digital coherent receivers
Solution Approach 2:
The patent integrates chromatic dispersion compensation functionality into the existing digital signal processing chain of the coherent receiver. The same digital processing infrastructure used for other signal recovery tasks is leveraged to perform dispersion compensation, eliminating the need for separate analog recovery circuits and reducing overall system complexity
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 allows for rapid and accurate chromatic dispersion compensation, reducing residual dispersion and circuit complexity, while avoiding the limitations of analog clock recovery.
Implementation Method 1
analog electrical signals obtained by opto-electric conversion of multiple optical signals that include an intensity of the received optical signal and phase information thereon
Data Source
AI summary
A signal processing circuit includes: a first compensator configured to compensate for waveform distortion corresponding to chromatic dispersion of a received optical signal by using digital electrical signals obtained by sampling analog electrical signals by using a sampling signal, the analog electrical signals being obtained by opto-electric conversion of multiple optical signals that include an intensity of the received optical signal and phase information thereon; and a chromatic dispersion compensation controller configured to control a compensation value for the chromatic dispersion in the first compensation from the digital electrical signals in which the chromatic dispersion has been compensated for on the basis of a detected phase offset between the sampling signal and a modulation frequency of the received optical signal.