Electro-Optic Mode Converter for Compact TM0-to-TE0 Laser Modules
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Solution Overview
Problem
Existing optical systems that convert polarization modes of light, such as from TM0 to TE0, often require additional optical modulators, leading to increased device size.
Innovation Solution
An optical element with a core layer made of electro-optic material, incorporating a mode converter that includes a first conversion portion to convert light from TM0 to TE1 mode, and a second conversion portion with a splitting portion, branch waveguides, and a coupling portion to convert light from TE1 to TE0 mode, thereby eliminating the need for a separate optical modulator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an optical modulator is provided in addition to the mode conversion element, then the light intensity modulation function is achieved, but the device size increases
Solution Approach 1:
The patent combines the mode conversion element and optical modulator into a single integrated device. The mode converter includes a polarization rotation portion and a mode order conversion portion that work together to convert TM0 mode light to TE0 mode light while simultaneously providing light intensity modulation through the electro-optic effect in the core layer, eliminating the need for a separate optical modulator and reducing overall device size
Solution Approach 2:
The mode conversion element is designed to perform multiple functions: it converts polarization modes (TM0 to TE1), converts mode orders (TE1 to TE0), and provides light intensity modulation through the electro-optic effect. This multi-functional design replaces what would traditionally require separate components, achieving both mode conversion and modulation in a single device
2Ease of operation
If a mode conversion element is used to convert TM0 mode to TE0 mode, then the polarization mode conversion is achieved, but the device structure becomes complex
Solution Approach 1:
The mode conversion process is divided into two distinct portions: a polarization rotation portion that converts TM0 mode to TE1 mode, and a mode order conversion portion that converts TE1 mode to TE0 mode. This segmentation allows each portion to be optimized independently while working together to achieve the overall mode conversion goal, making the complex conversion process more manageable and efficient
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 allows for compact optical elements and laser modules by integrating the mode conversion and modulation functions, reducing device size while maintaining efficient light conversion and modulation capabilities.
Implementation Method 1
a core layer provided on the main surface and made of a material having an electro-optic effect
Data Source
AI summary
A core layer of an optical element includes a second conversion portion that converts a polarization mode of light from a TE1 mode to a TE0 mode. The second conversion portion includes: a splitting portion that splits the light in the TE1 mode incident from the first conversion portion into first split light in the TE0 mode and second split light in the TE0 mode which are in opposite phases; a coupling portion that couples the first split light that has propagated through a first branch waveguide and the second split light that has propagated through a second branch waveguide to emit the light in the TE0 mode; and a phase adjustment unit that adjusts a phase difference between the first split light and the second split light. The first branch waveguide and the second branch waveguide are arranged in a second direction.