Interferometric Wavemeter for Broadband Photonic Sensors
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Solution Overview
Problem
Current silicon photonic systems lack an interferometric wavemeter capable of effectively monitoring and detecting laser wavelengths across a broad wavelength range (600 nm to 2500 nm) with high resolution and sensitivity, particularly for broadband sensors and LIDAR applications.
Innovation Solution
The development of an interferometric wavemeter system utilizing 1×N branching with multiple unbalanced Mach-Zehnder Interferometers (MZIs) and Vernier detuning, enabling fine-grid resolution and variable slope detection sensitivity across the broad wavelength range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single interferometric wavemeter design is used, then the device complexity is reduced, but the measurement precision and detection sensitivity across broadband wavelengths cannot be maintained
Solution Approach 1:
The wavemeter system is divided into multiple independent interferometric modules, each optimized for specific wavelength ranges. This segmentation allows each module to achieve high measurement precision in its designated range while the collective system covers the full broadband spectrum, resolving the contradiction between precision and complexity.
Solution Approach 2:
The patent introduces an additional dimension of design by implementing multiple interferometric stages with different path length differences. This multi-dimensional approach enables the system to achieve fine-grid resolution across broadband wavelengths without requiring a single overly complex device design.
2Measurement precision
If the arm length difference in MZI is increased to improve wavelength resolution, then the measurement precision improves, but the free spectral range decreases limiting broadband detection
Solution Approach 1:
The system segments the wavelength detection task across multiple MZI modules, each with different arm length differences. This allows each module to operate at optimal resolution for its specific wavelength range while collectively covering the full broadband spectrum from 600 nm to 2500 nm.
Solution Approach 2:
The patent systematically varies the arm length difference parameter across different interferometric modules to optimize performance for different wavelength ranges. This parameter optimization enables each module to achieve maximum wavelength resolution while the ensemble provides broad spectral coverage.
3Adaptability or versatility
If multiple interferometric modules with different FSR are used to cover broadband wavelengths, then the adaptability improves, but the device complexity increases
Solution Approach 1:
Each interferometric module is designed to serve multiple functions: wavelength detection, FSR measurement, and sensitivity calibration across different operational ranges. This multi-functionality reduces the need for separate specialized devices, managing complexity while maintaining broad adaptability.
Solution Approach 2:
The system implements self-calibration and self-characterization capabilities where the interferometric modules automatically determine their own FSR and sensitivity parameters. This self-service approach reduces operational complexity and enables automatic adaptation to broadband wavelengths without requiring complex external calibration systems.
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 solution provides a fine-grid resolution and enhanced sensitivity for monitoring and detecting laser wavelengths, effectively addressing the limitations of existing systems and enabling accurate broadband sensing and LIDAR applications.
Implementation Method 1
each one in the plurality to receive one of the outgoing optical signals from the splitter; and a control circuit to collate outputs from individual ones of the plurality of wavemeters
Data Source
AI summary
Disclosed herein are embodiments of a broadband wavemeter system comprising: a laser source to generate an optical signal having one or more wavelengths; a tap to separate a portion of the optical signal from the laser source; a splitter to split an incoming optical signal from the tap into a plurality of outgoing optical signals; a plurality of wavemeters, each one in the plurality to receive one of the outgoing optical signals from the splitter, in which each wavemeter in the plurality of wavemeters comprises a Mach-Zehnder Interferometer (MZI), and each wavemeter has at least one of free spectral range (FSR) detuning and center wavelength detuning, and a control circuit to collate outputs from individual ones of the plurality of wavemeters to monitor, detect and control the laser source.