Polarization-maintaining (PM) OS2 fibers are single-mode fibers designed to preserve polarization, with manufacturers including Corning, Thorlabs, Coherent, and Fibercore.

Overview of PM OS2 Fibers

Polarization-maintaining fibers are single-mode fibers with high built-in birefringence, which defines two orthogonal axes (slow and fast) to maintain the polarization state of light during propagation, even under bending or twisting . OS2 fibers are optimized for long-distance single-mode transmission in the 1310–1550 nm range, making them suitable for telecom, sensing, and interferometric applications.

Key Manufacturers and Products

• Corning: Offers PANDA PM fibers with excellent birefringence and low attenuation, covering wavelengths from 400–1550 nm. Designs include high numerical aperture (NA) and flame-retardant coatings .
• Thorlabs: Provides PM fibers in various designs such as PANDA, bow-tie, and Zing™, with operating wavelengths from 350 nm to 2.2 µm. They also offer specialty fibers for ultrashort pulse applications .
• Coherent: Supplies PM2000D fibers for high-power laser systems (~2 µm), featuring single-mode cores, excellent beam quality, and advanced NuCOAT coatings for durability in industrial, medical, and defense environments .
• Fibercore and Other Suppliers: Fibercore (UK), YOEC (China), Fujikura (Japan), and FS.COM (US) provide PM fibers with customizable specifications for polarization stability, single-mode operation, and environmental robustness .

Applications

PM OS2 fibers are critical in systems where polarization stability is essential, including:

• Fiber optic gyroscopes (FOGs): Maintaining polarization of counter-propagating beams to prevent rotation sensing drift .
• Interferometric sensors: Ensuring stable interference contrast in Mach–Zehnder interferometers and current sensors .
• Telecom and high-speed data links: OS2 fibers support long-distance single-mode transmission with minimal polarization mode dispersion.

Considerations for Selection

When choosing a PM OS2 fiber, consider:

• Birefringence and polarization extinction ratio (PER): Higher values improve polarization maintenance.
• Attenuation and wavelength range: Ensure compatibility with telecom or sensing wavelengths.
• Fiber design and coating: PANDA, bow-tie, or spun fibers, and coatings like NuCOAT or flame-retardant, affect durability and environmental performance.
• Manufacturer support and customization: Some suppliers offer tailored fiber lengths, connectors, and coatings for specific applications. By selecting a reputable manufacturer and matching the fiber specifications to your application, you can ensure stable polarization, low loss, and reliable long-distance performance.