Optical Receiver Power Control via Adaptive Tap Filtering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional optical receivers with digital coherent reception methods experience high power consumption due to the need for increased filter taps and optimized tap coefficients for accurate waveform equalization, especially at high transmission speeds, which complicates dispersion compensation in optical fiber communication systems.
Innovation Solution
A method for controlling electric power supply to an optical receiver by calculating variable parameters for waveform equalization based on the optical fiber transmission line state and determining which parameters have a small influence, thereby stopping power supply to unnecessary circuit parts, reducing overall power consumption while maintaining high accuracy in dispersion compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of filter taps is increased to achieve high accuracy waveform equalization, then dispersion compensation accuracy is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the filter tap configuration adaptive rather than fixed. The system dynamically adjusts the number of active filter taps based on real-time estimation of chromatic dispersion and polarization mode dispersion conditions. When dispersion is strong, more taps are activated for high accuracy equalization; when dispersion is weak, fewer taps are used to reduce power consumption. This dynamic adaptation resolves the contradiction between equalization accuracy and power consumption.
Solution Approach 2:
The patent changes the parameter of filter tap configuration based on transmission line state. By estimating the actual dispersion conditions and adjusting the number of active taps accordingly, the system optimizes the balance between equalization performance and power consumption. This parameter change approach allows the system to achieve high accuracy when needed while minimizing power usage during normal operation.
2Adaptability or versatility
If more circuit blocks are added to perform comprehensive digital signal processing, then signal processing capability is improved, but device complexity increases
Solution Approach 1:
The patent segments the digital signal processing function into modular circuit blocks, each responsible for specific tasks such as chromatic dispersion compensation, polarization mode dispersion compensation, and waveform equalization. This segmentation allows the system to activate only the necessary modules based on transmission conditions, reducing overall device complexity while maintaining comprehensive signal processing capability when needed.
Solution Approach 2:
The patent implements multi-functionality by designing circuit blocks that can perform multiple signal processing functions depending on the transmission line conditions. The same hardware infrastructure supports various processing modes (different numbers of filter taps, different compensation algorithms), allowing a single device to handle diverse signal processing requirements without proportionally increasing complexity.
3Measurement precision
If filter tap coefficients are optimized for specific transmission conditions, then waveform equalization accuracy is improved, but adaptability to varying conditions deteriorates
Solution Approach 1:
The patent applies dynamics by continuously estimating transmission line conditions and dynamically adjusting filter tap coefficients in real-time. Rather than using fixed optimized coefficients, the system adapts the coefficients based on current chromatic dispersion and polarization mode dispersion estimates. This dynamic adjustment maintains high equalization accuracy across varying transmission conditions while preserving adaptability.
Solution Approach 2:
The patent implements feedback by continuously monitoring signal quality and using this information to adjust filter tap coefficients. The system estimates transmission line parameters from received signals and uses this feedback to optimize the equalization filters in real-time. This feedback mechanism ensures that the system maintains high accuracy while adapting to changing transmission conditions.
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 effectively reduces power consumption in optical receivers while achieving high accuracy in waveform equalization and dispersion compensation, optimizing power usage based on the optical fiber transmission line conditions.
Implementation Method 1
an optical receiver that receives signal light propagated in an optical fiber transmission line, converts the signal light into a digital electrical signal
Data Source
AI summary
In a digital signal processing circuit of an optical receiver applicable to this method for electric power supply control, tap coefficients of a filter used in a waveform equalization section are calculated in a tap coefficient calculating section, based on a state of an optical fiber transmission line. Then, among the calculated tap coefficients, a tap coefficient for which an absolute value is less than a previously determined threshold is determined, and electric power supply to a circuit part of a filter corresponding to the tap coefficient is stopped. As a result, for an optical receiver that performs digital signal processing, it is possible to reduce the power consumption, while realizing waveform equalization at a high accuracy.