Device and Method for Maintaining Polarization in Highly Birefringent Fibers Under Environmental Disturbances

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This invention describes a device and method to maintain the polarization of light in highly birefringent optical fibers despite disturbances from the environment. It uses a novel alignment process involving modulation of the fiber's internal birefringence—achieved via precisely controlled heating or cooling elements—to ensure that a linearly polarized laser beam is transmitted with a stable extinction ratio above 55 dB.

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• Long-distance optical communication systems requiring consistent polarization maintenance
• Quantum communication networks where stable polarization is crucial for secure transmission
• Precision measurement instruments using polarized laser beams
• Fiber-optic sensors in harsh or fluctuating environmental conditions
• Optical signal processing and modulation applications

BenefitsContent extracted from patent full text and abstract with AI.

• Greatly improved stability of light polarization in optical fibers
• High extinction ratio provides better signal quality and reduced noise
• Minimizes the effect of environmental temperature fluctuations on polarization
• Enables more reliable and accurate optical systems in research and industry
• Supports applications that depend on maintaining strict polarization, such as quantum technologies

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Patent Abstract

Übertragung eines linear polarisierten Laserstrahls durch eine polarisationserhaltende optische Faser mit einem stabilen Extinktionsverhältnis von mehr als 55 dB unter Verwendung eines neuartigen Polarisationsausrichtungsprozesses. Die Ausrichtung eines in eine optische Faser eintretenden monochromatischen Lichtstrahls basiert auf der Modulation der internen Doppelbrechung der Faser durch eine Modulation mit hoher Bandbreite und kontinuierlicher Doppelbrechung. Die Anordnung von Heiz- oder Kühlelementen an oder um oder in polarisationserhaltenden optischen Fasern führt dazu, dass nur minimale thermische Änderungen verursacht werden, um eine Modulation zu erzielen.