10 Gigabit multimode fiber optic patch cords typically use OM3 or OM4 fibers with 50/125 µm core/cladding, supporting high bandwidth and low insertion loss for short-distance, high-speed networks.

Fiber Type and Core Size

• OM3 and OM4 are the most common for 10GbE applications, with 50 µm core and 125 µm cladding (50/125 µm) optimized for VCSEL laser sources .
• OM3 supports up to 300 meters at 10GbE, while OM4 extends this to approximately 400 meters .
• OM5 is designed for wideband multimode applications, supporting multiple wavelengths for future scalability .

Bandwidth and Performance

• OM3: 2000 MHz·km at 850 nm
• OM4: 4700 MHz·km at 850 nm
• These high bandwidths ensure low modal dispersion and reliable 10GbE performance .
• Insertion loss: Typically 0.1 dB (optimized multimode) to 0.35 dB (standard multimode) per connector .
• Return loss: High-quality connectors provide low back reflection, often exceeding 20 dB for multimode fibers .

Connectors and Termination

• Common connectors: LC, SC, ST, FC, MTRJ, MU, MPO/MTP .
• Factory-terminated cords are tested for insertion loss, return loss, and end-face quality to ensure repeatable performance .
• Some connectors, like E2000, feature spring-loaded shutters to protect ferrules from dust and scratches .

Jacket and Mechanical Properties

• Jackets are available in LSZH (Low Smoke Zero Halogen) or OFNR (Riser-rated) for safety and durability .
• Patch cords are designed for high tensile strength and rugged use in data centers and telecom environments .

Design Considerations

• Wavelength compatibility: 850 nm for multimode, 1310 nm for single-mode transceivers .
• Link power budget: Must account for cable attenuation, connector loss, and splice loss to maintain signal integrity over the intended distance .
• Mode-conditioning patch cords may be required for certain 10GBASE-LX4 multimode applications to prevent differential mode delay issues .

Summary

For 10 Gigabit Ethernet multimode applications, OM3 or OM4 50/125 µm fibers with LC or SC connectors, low insertion loss, and high bandwidth are standard. Proper selection ensures compatibility with VCSEL transceivers, supports the required link distance, and maintains low bit error rates in high-speed networks .