Integrated WDM Optical Assembly for Inline Power Measurement
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Solution Overview
Problem
Existing methods for measuring optical power levels in passive optical networks and CWDM systems are complex, incur signal loss, and require significant space and cost due to the need for multiple optical couplers and splices, limiting the dynamic range of measurement circuits.
Innovation Solution
The use of first and second multiplexers/demultiplexers, such as filter wavelength division multiplexers or arrayed waveguide grating multiplexers, in conjunction with tap photodetectors and bandpass filters, to split and combine optical signals, allowing for efficient measurement of multiple wavelengths with reduced component count and space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple optical couplers and splices are used to tap and split optical signals, then the measurement function is achieved, but the device complexity and space requirements increase
Solution Approach 1:
The patent combines multiple optical coupler functions into a single integrated optical assembly that performs signal tapping, wavelength separation, and power measurement in one unit, eliminating the need for multiple discrete couplers and splices
Solution Approach 2:
The optical assembly is designed to measure multiple wavelengths simultaneously using a single device structure, making it universally applicable to various wavelength combinations in PON and CWDM systems without requiring separate measurement paths
2Measurement precision
If multiple optical couplers and splices are used to tap and split optical signals, then the measurement function is achieved, but the cost increases
Solution Approach 1:
The patent combines multiple optical coupler functions into a single integrated optical assembly that performs signal tapping, wavelength separation, and power measurement in one unit, eliminating the need for multiple discrete couplers and splices
Solution Approach 2:
The patent uses a single optical assembly design that can be replicated and deployed across multiple measurement points, reducing per-unit manufacturing costs through standardization
3Measurement precision
If multiple optical couplers and splices are used to tap and split optical signals, then the measurement function is achieved, but signal loss increases
Solution Approach 1:
The patent combines multiple optical coupler functions into a single integrated optical assembly that performs signal tapping, wavelength separation, and power measurement in one unit, eliminating the need for multiple discrete couplers and splices
Solution Approach 2:
The patent extracts only the necessary measurement function from complex multi-coupler systems, using a simplified single-coupler design that taps the required signal portion without introducing excessive loss
4Measurement precision
If multiple optical couplers and splices are used to tap and split optical signals, then the measurement function is achieved, but the dynamic range of measurement circuits is limited
Solution Approach 1:
The patent combines multiple optical coupler functions into a single integrated optical assembly that performs signal tapping, wavelength separation, and power measurement in one unit, eliminating the need for multiple discrete couplers and splices
Solution Approach 2:
The patent enables the measurement system to adapt to different wavelength combinations and power levels by adjusting the operational parameters of the single optical assembly, expanding its dynamic range without requiring physical reconfiguration
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 configuration reduces the number of optical components and splices, lowers costs, and enables more compact designs while maintaining accurate power measurements across different wavelengths, including bidirectional capabilities without the need for designated test port connectors.
Implementation Method 1
a first multiplexer/demultiplexer configured to split/combine an optical signal comprising a first wavelength and second wavelength between a first single fiber and a plurality of branches
Implementation Method 2
a first bandpass filter integrated with the first tap photodetector or coupled, at one end thereof, to the first multiplexer/demultiplexer and, at another end thereof, to said first tap photodetector
Implementation Method 3
a first tap photodetector in the first branch coupled to said first and second multiplexer/demultiplexers and to a first measurement device for measuring an optical power level of the first optical signal
Data Source
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AI summary
An apparatus for measuring optical power including a first multiplexer/demultiplexer to split/combine an optical signal including a first wavelength and second wavelength; a second multiplexer/demultiplexer to split/combine an optical signal including the first wavelength and the second wavelength; a first tap photodetector coupled to the first and second multiplexer/demultiplexers and to a first measurement device; and a second tap photodetector coupled to the first and second multiplexer/demultiplexers and to a second measurement device.