Corning to Implement New Laser Bandwidth Measurements on InfiniCor(R) Fibers

Aug 15, 2000, 01:00 ET from Corning Incorporated

    CORNING, N.Y., Aug. 15 /PRNewswire/ -- Corning Incorporated (NYSE:   GLW), a
 world-leading supplier of optical fiber, photonic products and optical cable,
 today announced that it will specify laser bandwidth on its InfiniCor(R) 300
 and InfiniCor(R) CL(TM) 1000 multimode fibers using the Restricted Mode Launch
 (RML) bandwidth measurement specification.  RML bandwidth provides a
 repeatable and accurate measurement of performance in laser-based systems used
 in high-speed networks. Minimum RML bandwidth values will be provided for both
 products at the 850 nm operating wavelength.
     In the past, multimode fiber has been specified according to a minimum
 over-filled launch bandwidth (OFL BW) standard.  OFL is a reliable and robust
 method of specifying bandwidth in multimode fiber when used with
 light-emitting diodes (LEDs) at lower speeds.  However, because LEDs
 distribute optical power throughout the entire fiber core, fiber specified to
 this measurement may not meet expected performance requirements in high-speed
 networks using laser light sources.  Laser launch conditions typically
 restrict power to fewer modes in the center of the core, thus requiring the
 fiber to be measured differently for laser bandwidth.
     The RML measurement is the result of the work done by the
 Telecommunication Industry Association (TIA) FO-2.2.1 Task Group on Modal
 Dependence of Bandwidth chaired by Mike Hackert, Measurement Project Engineer
 at Corning Incorporated.  The goal of the Task Force was to establish
 restrictions on the launch power distribution of the laser source as well as
 the bandwidth properties of the multimode fiber under a standard restricted
 mode launch.  The TIA recently adopted RML BW as the standard measurement of
 laser bandwidth for 62.5 micron multimode fibers operating at 850 nm.
     "By providing minimum RML bandwidth on our InfiniCor 300 and InfiniCor CL
 1000 products, Corning will provide end users with bandwidth values that
 accurately predict multimode fiber performance when used in laser-based
 systems," says Carolyn Case, product line manager - Premises at Corning
 Incorporated.  "Although the RML measurement methodology has not yet been
 validated in standards for 50 micron fiber or for operation at 1300 nm,
 Corning will lead the efforts to develop measurement specifications that will
 soon be available for all multimode fibers.  In the meantime, we will continue
 to use our proprietary measurements to guarantee performance in laser-based
     According to Alan Eusden, vice president and general manager - Corning
 Optical Fiber, "Corning continues to lead the industry in the innovation and
 implementation of new fiber technology. The development of practical bandwidth
 test methodologies along with continued refinements in fiber manufacture, are
 key to the success of low-cost, laser-based, high-speed network systems."
     Corning has pioneered multimode fiber technology developments for
 high-speed local area networks.  In September 1998, Corning launched the
 InfiniCor fiber product line, the world's first multimode laser-optimized
 fiber(TM).  InfiniCor fiber guarantees link lengths well beyond what is
 specified in the IEEE 802.3z standard for Gigabit Ethernet and exceeds
 ANSI/TIA/EIA-568-A specifications. Within months of the product's launch,
 Corning sold 100,000 kms of InfiniCor fiber with its revolutionary approach to
 solving laser-multimode fiber issues uncovered in the development of the
 Gigabit Ethernet standard.  In February 1999, Corning introduced InfiniCor
 CL(TM) fiber, the first multimode fiber that provided network managers with
 the ability to transmit over extraordinary distances at Gigabit Ethernet
 speeds while also eliminating the need for a mode-conditioning patch cord at
     Established in 1851, Corning Incorporated ( creates
 leading-edge technologies for the fastest-growing markets of the world's
 economy.  Corning manufactures optical fiber, cable and photonic products for
 the telecommunications industry; and high-performance displays and components
 for television and other communications-related industries.  The company also
 uses advanced materials to manufacture products for scientific, semiconductor
 and environmental markets.  Corning's revenues in 1999 were $4.7 billion.
 More information on Corning optical fiber is available at

SOURCE Corning Incorporated