Optical Component Characterization via Sideband Signal Decomposition
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Solution Overview
Problem
The characterization of optical components is degraded by unwanted sideband signals in Semiconductor Monolithic Tunable Laser Source (SMTLS) systems, which are larger and more significant than in conventional lasers, leading to inaccurate measurement of insertion loss.
Innovation Solution
A method and system that utilize a semiconductor laser source to direct light with a primary signal and sideband signals, where the distance between the primary and sideband signals is substantially larger than the pass-band width of the device under test, allowing for the detection and correction of errors associated with sideband signals to accurately characterize optical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Semiconductor Monolithic Tunable Laser Source (SMTLS) is used to characterize optical components, then the speed of sweep and cost are improved, but the sideband signals become larger and degrade the measurement quality
Solution Approach 1:
The patent segments the detected signal into multiple components corresponding to different laser modes (primary mode and sideband modes). By separating and independently analyzing each mode's contribution, the system can identify and exclude the harmful sideband signals while retaining the useful primary mode data for accurate optical component characterization.
Solution Approach 2:
The patent extracts and removes the sideband signal components from the total detected signal. Through mathematical decomposition, the system isolates the sideband contributions and subtracts them from the measurement, leaving only the primary mode signal that accurately represents the optical component's characteristics without parasitic interference.
2Ease of manufacture
If SMTLS is used to characterize optical components, then cost is reduced, but the sideband signals degrade the insertion loss measurement accuracy
Solution Approach 1:
The patent converts the harmful sideband signals into useful information by analyzing their characteristics. The sideband spacing provides information about the laser's mode structure, which is used to identify and correct their parasitic effects. By understanding and characterizing the sidebands, the system transforms them from measurement errors into a known quantity that can be compensated for mathematically.
Solution Approach 2:
The patent implements a feedback mechanism where the detected signal is continuously analyzed to identify sideband contributions, and correction factors are applied in real-time during the measurement process. This closed-loop approach ensures that the final insertion loss measurement accurately reflects the optical component's true characteristics despite the presence of sideband signals.
Data Source
AI summary
A method and a system for characterization of optical components through characterized decomposition of an optical device includes: directing incident light over a range of wavelengths to a device under test, wherein the incident light includes a primary signal and at least one sideband signal, the distance between the primary signal and any one of the sideband signals is substantially larger than the width of the band pass area of the device under test; detecting output light from the device under test to obtain a detected signal; correcting the detected signal to account errors associated with the sideband signal.