Mode Hop Wavelength Error Correction in Optical Measurement
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Solution Overview
Problem
Tunable laser sources (TLS) experience mode hop phenomena, leading to wavelength errors during optical component measurements, which affect the accuracy of characterizing passive optical components used in telecommunication systems, as the wavelength of the laser output skips between modes rather than smoothly transitioning, causing discontinuities in the measurement process.
Innovation Solution
A method and apparatus for detecting mode hop wavelength errors in optical measurement systems, which involves using a tunable laser source to sweep over a range of wavelengths, detecting anomalies with a reference optical component, and correcting measurement data to account for mode hop errors, allowing for more accurate characterization of optical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a tunable laser source is used to sweep over a range of wavelengths for optical component measurement, then the operational range and versatility of the measurement system is improved, but mode hop wavelength errors occur causing measurement precision to deteriorate
Solution Approach 1:
The patent applies preliminary action by detecting mode hop events before they significantly impact measurement accuracy. The system continuously monitors the laser wavelength during sweeping and identifies mode hop occurrences in advance, allowing corrective actions to be taken proactively rather than reactively. This enables the system to maintain measurement precision across a wider operational range by preparing correction mechanisms before errors propagate through the measurement process.
Solution Approach 2:
The patent implements feedback by continuously monitoring the actual wavelength output of the tunable laser source and comparing it against the expected wavelength trajectory. When mode hop errors are detected through this feedback mechanism, the system automatically adjusts subsequent measurements or applies correction algorithms. This closed-loop feedback approach allows the measurement system to maintain high precision across extended wavelength ranges by dynamically compensating for mode hop disturbances.
2Measurement precision
If mode hop correction is applied to maintain measurement accuracy, then measurement precision is improved, but device complexity increases due to additional detection and correction mechanisms
Solution Approach 1:
The patent applies universality by designing measurement apparatus that can perform both normal optical component characterization and mode hop detection with integrated hardware and software. The same optical path and detection systems are used for both primary measurements and mode hop monitoring, eliminating the need for completely separate detection subsystems. This multi-functional approach reduces overall system complexity while maintaining high measurement precision through corrective capabilities.
Solution Approach 2:
The patent implements self-service by enabling the measurement system to automatically detect and correct its own mode hop errors without requiring external intervention or complex additional equipment. The system uses its existing optical paths and detection capabilities to monitor wavelength accuracy and apply corrections autonomously. This self-correcting capability reduces device complexity by leveraging existing system resources rather than adding numerous separate correction mechanisms.
Data Source
AI summary
A method of and system for correcting mode hop wavelength error in data obtained measuring optical characteristics over a number of wavelengths, includes at a location where mode hop wavelength error occurs in an assemblage of data, representing optical characteristics with respect to wavelength of incident electromagnetic energy of a device under test, compensating or correcting the data to overcome errors due to mode hop occurring in the measurement process.