AI Insight
Researchers at the University of the Witwatersrand have discovered that a mathematical shortcut used by engineers for over 50 years to describe light behavior in optical fibers inadvertently masks a real physical effect. They found that placing a magnet perpendicular to a multimode optical fiber, rather than parallel to it, can measurably alter the light propagating through the fiber. This magneto-optic effect has been hidden by standard approximations that, while convenient and generally accurate, overlook this subtle phenomenon in ordinary glass fiber.
Why it matters
This finding could have implications for optical fiber technology, particularly in applications where magnetic fields are present or where precise control of light is required. It may lead to new methods for manipulating light in fiber optic systems or require adjustments to existing models used in fiber optic engineering and telecommunications.
For more than 50 years, engineers have described light in optical fiber using a convenient shortcut, one that works so well it is rarely questioned. Engineers at the University of the Witwatersrand (Wits University) in Johannesburg, South Africa, have now shown that this shortcut hides a small but real effect. A magnet placed beside a multimode fiber, rather than along it, can change the light traveling inside.
Source: A standard shortcut, used since the 1970s, hides a magneto-optic effect in ordinary glass fiber