Optical Wavemeter MZI Sub-picometer Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for measuring the wavelength, output power, and side mode suppression ratio (SMSR) of tunable lasers require multiple instruments, which are expensive, time-consuming, and lack accuracy, particularly in high bit-rate optical communication systems.
Innovation Solution
A single optical wavemeter device incorporating a photonic integrated circuit (PIC) with Mach-Zehnder Interferometers (MZIs) and a controller to split and process optical signals, enabling simultaneous measurement of wavelength and SMSR with sub-picometer and sub-dB accuracy, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate instruments (multi-wavelength meter, power meter, spectrum analyzer) are used to measure wavelength, power, and SMSR, then measurement coverage is comprehensive, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple separate measurement instruments (multi-wavelength meter, power meter, and spectrum analyzer) into a single integrated optical wavemeter device. This consolidation maintains comprehensive measurement coverage for wavelength, power, and SMSR while reducing the number of separate instruments from three to one, thereby resolving the contradiction between versatility and device complexity.
Solution Approach 2:
The optical wavemeter is designed as a universal measurement device that can perform multiple functions: measuring wavelength, output power, and side-mode suppression ratio (SMSR) of tunable lasers. This multi-functional capability eliminates the need for separate specialized instruments while maintaining comprehensive measurement coverage, directly addressing the technical contradiction.
2Adaptability or versatility
If multiple separate instruments are used for measurement, then comprehensive parameters can be measured, but measurement time increases
Solution Approach 1:
By merging wavelength measurement, power measurement, and SMSR measurement capabilities into a single optical wavemeter, the system enables simultaneous or sequential measurement of all three parameters without requiring physical relocation or reconfiguration between separate instruments, thereby reducing total measurement time while maintaining comprehensive parameter coverage.
Solution Approach 2:
The universal design of the optical wavemeter allows it to measure multiple parameters (wavelength, power, SMSR) within a single measurement session, eliminating the time loss associated with switching between specialized instruments and enabling efficient comprehensive characterization of tunable lasers.
3Productivity
If conventional measurement methods are used, then measurement can be performed, but accuracy is insufficient for high bit-rate optical communication systems
Solution Approach 1:
The patent employs parameter changes in the measurement approach by using a swept-wavelength technique with precise wavelength scanning and detection. This method achieves sub-picometer wavelength accuracy and sub-dB power accuracy by systematically varying and measuring optical parameters, thereby resolving the contradiction between measurement efficiency and measurement precision for high bit-rate optical communication 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
The solution provides a cost-effective, accurate, and efficient means to measure laser parameters using a single instrument, reducing the complexity and time required for testing, while improving the accuracy of wavelength and power measurements in tunable lasers and high bit-rate optical transmitters.
Implementation Method 1
a first Mach-Zehnder Interferometer (MZI) disposed over the substrate, comprising first optical waveguides having a first effective index of refraction and configured to receive the third output optical signal from a light source; and a second Mach-Zehnder Interferometer (MZI) disposed over the substrate
Implementation Method 2
first optical waveguides having a first effective index of refraction and configured to receive the third output optical signal from a light source
Data Source
AI summary
An optical device having a wavelength measurement section and an SMRS measurement section is disclosed. The wavelength measurement section includes a MZI, which includes first optical waveguides having a first optical path length difference. The wavelength measurement section also includes a second MZI, which includes second optical waveguides having a second optical path length difference. The second optical path length difference is greater than the first optical path length difference. The SMRS includes a filter adapted to suppress a primary laser mode of the second output optical signal and to pass a remaining portion of the second output signal to determine an SMRS based on an optical power of the main laser mode from the wavelength and power measurement stage, and an optical power of the remaining portion of the second output optical signal.