Tap Coupler Rib Waveguide Segmentation Wavelength Dependence
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Solution Overview
Problem
Existing tap couplers in optical communication systems exhibit high wavelength dependence, leading to unstable tap ratios and excessive signal light loss, particularly in wavelength-division multiplexing systems, which degrades signal quality and transmission efficiency.
Innovation Solution
A tap coupler design incorporating a high-order mode generation unit and separation unit, utilizing rib waveguides with discontinuous core widths to generate and separate signal light into distinct modes, reducing wavelength dependence and excessive loss by optimizing the generation and separation efficiency of these modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional tap coupler is used to branch signal light, then the tap ratio can be adjusted, but the tap ratio becomes unstable and excessive loss occurs due to high wavelength dependence
Solution Approach 1:
The optical waveguide is divided into multiple sections with different core widths. The first optical waveguide has a first core width, the second optical waveguide has a second core width, and the third optical waveguide has a third core width. This segmentation allows different sections to handle different wavelength ranges efficiently, reducing overall wavelength dependence and stabilizing the tap ratio across wide bandwidths.
Solution Approach 2:
Different sections of the optical waveguide are designed with locally optimized properties. The first section (first optical waveguide) is optimized for certain wavelengths, the second section (second optical waveguide) for intermediate wavelengths, and the third section (third optical waveguide) for other wavelengths. This local optimization ensures minimal excessive loss at each wavelength while maintaining stable tap ratio.
2Adaptability or versatility
If the tap coupler is designed for wideband operation, then wavelength dependence increases, but this leads to unstable tap ratios and degraded signal quality
Solution Approach 1:
The waveguide is segmented into three distinct optical waveguides with progressively changing core widths. This segmentation enables each section to be optimized for specific wavelength ranges, allowing the overall device to operate across a wide bandwidth while maintaining stable tap ratios through the cumulative effect of each section's optimized performance.
Solution Approach 2:
The core width parameter is systematically changed across different sections of the optical waveguide. The first optical waveguide has a first core width, the second has a second core width, and the third has a third core width. This parameter change strategy allows the device to adapt to different wavelengths while maintaining consistent tap ratio performance across the wide operating bandwidth.
3Device complexity
If a simple directional coupler structure is used, then the device complexity is low, but wavelength dependence becomes significant causing excessive loss
Solution Approach 1:
Instead of using a single complex high-order mode generator, the invention segments the structure into three simpler optical waveguides with different core widths. This segmentation achieves the same wavelength-independent performance as complex high-order mode generation but with a simpler, more manufacturable structure that reduces excessive loss.
Solution Approach 2:
Conventional approaches use high-order mode generation to achieve wavelength independence. This invention inverts the approach by using fundamental mode propagation through sequentially optimized waveguide sections with different core widths, achieving the same goal through a fundamentally different, simpler mechanism that reduces complexity and loss.
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 design achieves a stable tap ratio with minimal wavelength dependence, allowing for wideband operation with low excessive loss, thereby enhancing signal quality and transmission efficiency in optical communication systems.
Implementation Method 1
a mode generation unit that generates, in accordance with a discontinuous portion that is disposed on a travelling path of signal light that is propagating, a first mode of the signal light and a second mode that is different from the first mode
Data Source
AI summary
A tap coupler includes a mode generation unit, a separation unit, and an output unit. The mode generation unit generates, in accordance with a discontinuous portion disposed on a travelling path of signal light that is propagating, a first mode of the signal light and a second mode that is different from the first mode. The separation unit separates, when the first mode and the second mode are input from the mode generation unit, the first mode and the second mode. The output unit outputs branch light in accordance with a transition of the second mode received from the separation unit.