Optical Fiber Cable M2 Factor Control for Return Light Noise
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Solution Overview
Problem
Conventional optical fiber cables face challenges in high-quality signal transmission over short distances due to noise-related issues caused by return light, which existing techniques fail to adequately address by modifying the optical fiber itself.
Innovation Solution
The optical fiber cable is designed with a specific M2 factor of 1.7 or more, controlled through a microscopic non-uniform structure and materials like perfluorinated polymers, to reduce the influence of return light and enhance signal transmission quality in short-distance communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional optical fiber is used in short-distance transmission, then transmission capacity can be increased, but noise-related problems occur due to return light that causes difficulty in high-quality high-speed signal transmission
Solution Approach 1:
The patent changes the physical parameter of the optical fiber by controlling the M2 factor (beam quality parameter) to 1.7 or more. This parameter change modifies how return light propagates through the fiber, reducing its ability to destabilize the light-emitting device while maintaining high transmission capacity for short-distance communication
Solution Approach 2:
Instead of trying to block or eliminate return light as conventional approaches do, the patent inverts the approach by optimizing the fiber's M2 factor to naturally reduce the harmful effects of return light. This transforms the problem from actively combating return light to passively minimizing its impact through fiber property optimization
2Object-affected harmful factors
If optical isolator or polarizer is added to reduce return light influence, then noise can be reduced, but device complexity increases
Solution Approach 1:
The patent extracts the noise reduction function from separate optical components (isolators, polarizers) and integrates it into the fundamental property of the optical fiber itself through M2 factor control. This eliminates the need for additional complexity-generating components while achieving the same noise reduction effect
Solution Approach 2:
The optical fiber serves itself by reducing the harmful effects of return light through its optimized M2 factor. The fiber's own physical properties are engineered to minimize noise from return light, eliminating the need for external noise-reduction components that would increase device complexity
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 approach effectively reduces noise and maintains high-quality signal transmission by controlling the M2 factor, improving the transmission quality and reducing transmission loss in short-distance optical communication systems.
Implementation Method 1
it becomes possible to increase mode coupling caused by forward scattering, and effectively control the M2 factor of light output from the optical fiber
Implementation Method 2
increase mode coupling caused by forward scattering, and effectively control the M2 factor of light output from the optical fiber
Implementation Method 3
light emitted from a light-emitting device such as a vertical cavity surface emitting laser (VCSEL) to enter an optical fiber through a proximal end (end A) thereof , i.e., one end thereof on the side of the light-emitting device, and propagated through the optical fiber, is partly reflected on the side of a distal end (end B) of the optical fiber
Data Source
AI summary
Provided is an optical fiber cable which allows for high-quality signal transmission in short-distance transmission. The optical fiber cable is designed for use in optical communication based on transmitting an optical beam from a light-emitting device, to a light-receiving device. The optical fiber cable has: a proximal end which is one end thereof on the side of the light-emitting device, and a distal end which is the other end thereof on the side of the light-receiving device, wherein an optical beam returning from the side of the distal end toward the side of the light-emitting device has an M2 factor of 1.7 or more; and a length of 50 m or less.