Dispersion Detection via Optical Power Measurement
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Solution Overview
Problem
Current dispersion detection methods in adaptive dispersion compensation systems are complex, costly, and insensitive to tiny changes in dispersion, limiting their effectiveness in high-speed optical transmission systems.
Innovation Solution
A method and device that detect dispersion by measuring the total or average power of an optical signal within a predetermined bandwidth range, using a photoelectric filter operational unit and processing unit to determine system dispersion through a correspondence relationship, eliminating the need for complex clock recovery units and additional detection light, and allowing for sensitive detection of tiny dispersion changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase difference comparison between clock signals is used for dispersion detection, then dispersion amount can be determined, but the system complexity increases due to requiring two sets of high speed photoelectric conversion and processing configuration
Solution Approach 1:
The patent extracts only the necessary power information from the optical signal through simple photoelectric conversion, filtering out unnecessary complex clock signal processing. By measuring the power of the photoelectric converted signal directly, the system eliminates the need for two sets of high-speed photoelectric conversion and processing configurations, significantly reducing system complexity while maintaining dispersion detection capability
Solution Approach 2:
The patent replaces expensive, complex clock recovery and phase comparison equipment with a simple, low-cost photoelectric converter and power meter. This substitution uses inexpensive components to achieve the same functional goal of dispersion detection, making the system more economical and easier to implement
2Measurement precision
If harmonics detection signal is added to the transmission signal, then system dispersion can be determined via harmonics intensity, but additional tune device needs to be added at the transmission side which increases system complexity
Solution Approach 1:
The patent removes the unnecessary harmonics detection signal injection equipment from the transmission side. Instead of adding complex modulation devices to generate harmonics signals, the system directly measures the power of the received optical signal after simple photoelectric conversion, eliminating the need for additional tune devices while maintaining dispersion detection capability
Solution Approach 2:
The patent enables the received optical signal itself to provide the necessary information for dispersion detection through its inherent power characteristics. The signal's own power variations, caused by dispersion effects, are directly measured without requiring external test signals or additional modulation, making the system self-sufficient and simpler
3Measurement precision
If optical signal is converted to electric signal and first minimum point of dispersion in power spectrum is detected, then system dispersion can be determined, but the configuration becomes complicated and power consumption increases due to requiring high-density sampling and amplification
Solution Approach 1:
The patent replaces power-intensive high-density sampling and amplification equipment with a simple power measurement approach. By directly measuring the average or total power of the photoelectric converted signal, the system achieves dispersion detection without requiring expensive, high-consumption ADCs and amplifiers, significantly reducing power consumption while maintaining detection precision
Solution Approach 2:
The patent uses a simplified power measurement approach that captures only the essential information needed for dispersion detection, rather than performing exhaustive high-density sampling of the entire signal spectrum. This partial measurement approach is sufficient for determining dispersion and dramatically reduces computational and hardware requirements
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 simplifies dispersion detection, reduces costs, and enhances sensitivity to tiny dispersion changes, making it applicable to both static and dynamic optical transmission systems, while conserving bandwidth and reducing power consumption.
Implementation Method 1
obtain an electric signal within a predetermined bandwidth range from an optical signal received
Data Source
AI summary
The present invention discloses a method for detecting dispersion, overcoming disadvantages of complex configuration and insensitivity to a tiny dispersion of the method and device for detecting dispersion in the prior art. The inventive method includes: obtaining a signal within a predetermined bandwidth range from an optical signal received; obtaining an operated value of power via an operation on the signal within the predetermined bandwidth range; and obtaining amount of system dispersion according to a corresponding relation between the operated value of power and the amount of system dispersion. A device for detecting dispersion is disclosed, including a photoelectric filter operational unit and a processing unit, where an output of the photoelectric filter operational unit is connected to an input of the processing unit. The device for detecting dispersion of the present invention is applicable to an adaptive dispersion compensation system. An optical signal transmission system is further disclosed.