TIA has recently completed work on the multimode fiber specification for OM4 optical cables, and recommended that TIA 492 AAAD, "Detail specification for 850 nm laser-optimized, 50 µm core diameter/
125 µm cladding diameter class Ia graded-index multimode optical fibers of OM4 performance” be published to define those specifications. A new article from OFS’ David Mazzarese, who was integrally involved in the standards development, clarifies some of the common terms used to describe laser-optimized multimode fiber as well as the relationship of the differential mode delay (DMD) specification to the bandwidth observed in VCSEL systems.
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OFS’ AllWave FLEX Bend-Optimized Single-Mode Fiber meets and exceeds the International Telecommunica-tions Union (ITU) new G.657A1 standard. AllWave FLEX Fiber is the world’s first Zero Water Peak fiber to offer optimized bend performance for FTTX, enterprise networks, or any application where small bend diameters may be encountered. G.657A1 (formerly G.657A) covers fiber with a 10 mm minimum design radius. Under the new recommendation, Category A is fully compliant with G.652D and suitable for long distance applications.
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Bend-optimized multimode fiber for the data center has been a popular discussion topic in the enterprise market. This fiber can provide additional system margin that results in a more reliable installation, but care must be taken to ensure that backward compatibility and mechanical reliability are not compromised. These fibers may also enable new cable management that can reduce equipment size or allow more effective cooling of the equipment. A new study from OFS shows that judicious choice of alternate multimode fiber design can provide more robust performance in high-speed transmission systems.
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Conventional G.652 single-mode fiber was designed to minimize loss and maximize bandwidth in 1310 nm systems. Its high chromatic dispersion at 1550 nm (approximately 17 ps/nm/km) requires costly dispersion compensation when data rates are above 2.5 Gb/s. However, dispersion compensation fiber normally introduces higher loss, PMD and cost into a system. The unique design of OFS’ TrueWave® RS LWP Fiber enables a significant reduction in total system cost (including compensation, amplifiers, and even lasers) compared to standard single-mode fiber and other NZDF fibers.
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... Andrew Oliviero, OFS senior manager of product management for optical fiber products, has authored “Cabling: The Complete Guide to Copper and Fiber-Optic Networking,” 4th edition. The book includes updates based on the Telecommunications Industry Association’s new edition of the ANSI/TIA-568-C series of standards for commercial building networks. Andrew helped develop this standard through his efforts in TIA TR- 42.
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… Tony Irujo, sales engineer at OFS, was guest speaker at a recent webconference on OM4 fiber held by the Fiber Optic LAN Section (FOLS) of TIA. Tony’s presentation discussed the market forces driving the need for higher Ethernet network speeds, the evolution of OM4 multimode fiber to meet these demands, and when to consider installing OM4.
To hear the presentation, go here >>