If a fiber is pressed under a heavy object—but doesn’t break—will the signal still be affected?
In the context of fiber optics, the scenario you described is a classic example of what causes Micro-bend Loss.
If a fiber is pressed under a heavy object, even if the glass fiber does not break, the optical signal will almost certainly be affected. This is due to tiny, microscopic deviations in the fiber’s axis caused by the localized mechanical pressure.
How it affects the signal:
- Light Leakage: Fiber optics transmit data by “Total Internal Reflection.” When pressure creates micro-bends, the angle at which light hits the core-cladding interface changes. Some light rays exceed the critical angle and “leak” out of the core into the cladding, leading to signal attenuation (loss of power).
- Long-term Reliability: While the fiber might not break immediately, the localized stress can accelerate the growth of micro-cracks in the silica, potentially leading to a failure later.
- Sensing Applications: In Fiber Bragg Grating (FBG) sensing, unintended micro-bends can introduce noise or baseline shifts in the signal, making it harder for the interrogator to accurately resolve the wavelength.
OFSCN® Solutions for Mechanical Protection:
To prevent signal loss and physical damage in harsh industrial environments, specialized packaging is required. Beijing Dacheng Yongheng Technology Co., Ltd. (OFSCN) provides several products designed to withstand high pressure:
- OFSCN® Seamless Steel Tube Fiber Optic Cable: By housing the fiber inside a high-strength seamless stainless steel tube, the fiber is shielded from external “heavy objects” or lateral pressure, ensuring the signal remains stable.
- OFSCN® Capillary Steel Tube Packaged FBG Temperature Sensor: These sensors use metal tube encapsulation to protect the sensitive FBG element from mechanical stress while maintaining high sensitivity.
Typical Protected Fiber Image:
https://www.ofscn.org/wp-content/uploads/2022/04/seamless-steel-tube-fiber-optic-cable-1.jpg
For more detailed technical specifications on how our products mitigate micro-bend loss, you can visit:
Specialty Fiber and Cables (International)
FBG Sensing Solutions (International)