* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Laser Bandwidth Measurements in Fiber Data Delivery for Corning
Survey
Document related concepts
Ultraviolet–visible spectroscopy wikipedia , lookup
Retroreflector wikipedia , lookup
Optical coherence tomography wikipedia , lookup
Confocal microscopy wikipedia , lookup
Harold Hopkins (physicist) wikipedia , lookup
Silicon photonics wikipedia , lookup
Optical rogue waves wikipedia , lookup
Optical amplifier wikipedia , lookup
Photonic laser thruster wikipedia , lookup
Photon scanning microscopy wikipedia , lookup
Optical tweezers wikipedia , lookup
3D optical data storage wikipedia , lookup
Optical fiber wikipedia , lookup
Ultrafast laser spectroscopy wikipedia , lookup
Mode-locking wikipedia , lookup
Transcript
Laser Bandwidth Measurements in Fiber Data Delivery for Corning® InfiniCor® Fibers White Paper Optical Fiber WP3724 Issued: April 2006 ISO 9001 Registered Peter Ronco, Dr. Russell Ellis, Phillip Bell Overview In January, 2006, Corning Optical Fiber announced that measured laser bandwidth values would be provided for all Corning® InfiniCor® fibers shipped to strategic customers. Corning has led industry development of laser bandwidth metrics for multimode fiber, and since 1998 has been the only optical fiber manufacturer to specify both the standardized bandwidth measurement procedure and the pass/fail criteria for every laser-optimized™ multimode fiber shipped. With this announcement, Corning Optical Fiber extended their laser bandwidth leadership to become the only manufacturer providing factory measurements to customers in their Fiber Data Delivery (FDD). minEMBc - Certified Laser Bandwidth fiber Corning’s minEMBc method for determining the minimum laser bandwidth (high data rate capability of a fiber) differs from the methods used by other multimode manufactures that rely upon normalized DMD-masks. Both the minEMBc and the DMD-mask measurement techniques were developed as part of the IEEE 802.3ae standard. The minEMBc metric, however, is the only scaleable measurement technique recognized by international standards1 that yields a laser bandwidth value for every fiber, providing a clear performance indicator when used with commercially available transceivers that are compliant with industry standards. Just as over-filled launch (OFL) bandwidth testing has demonstrated conformance for legacy applications and specifications, laser bandwidth test data provided by Corning can be used to certify the requirements demanded by bandwidth hungry applications used today and in the future. Engineered Links Another key advantage enabled by a factory laser bandwidth measurement using minEMBc is the ability to customize multimode fiber link designs. An “engineered link” is any solution that reaches farther or enables more system margin that can be used to support additional connector pairs in the link than what is described in standards.2 1 2 MinEMBc, In accordance with TIA 455-220 and IEC 60793-1-49. Engineered links were first described by Corning Optical Fiber at the 2003 International Wire and Cable Symposium. See The Evolution of 50/125 µm Fiber Since the Publication of IEEE 802.3ae (WP 4253), reprinted by permission at www.corning.com/opticalfiber. For example, IEEE 802.3ae, commonly called the “10 Gigabit Ethernet Standard,” describes a multimode fiber network that will support 300 meters at 10 Gb/s (among other solutions).3 Any network installed in accordance with this standard can then be relied upon to perform in accordance with the standard. Sometimes, however, end-users may need a longer reach or need to use more connectors, and will seek out multimode fiber solutions that support their particular requirements. Such solutions place additional engineering obligations on their designers and vendors to ensure field performance, effectively necessitating customengineered links. For premises networks that are built using laser-based transceivers, all application standards predict system performance using a variation of the Excel-based model developed by Hanson et. al. of Agilent Technologies, where attributes of different components are used to calculate a number of optical performance parameters and, ultimately, to predict link length and any system margin.4 A key attribute is “modal bandwidth,” which requires the fiber’s bandwidth in units of MHz.km for the laser to be used. A more accurate model input is “Effective Modal Bandwidth” (EMB), which describes a fiber’s performance with a particular light source.5 A bandwidth measurement that correctly predicts laser-based system performance is more suitable for use in the various standards models. A reliable “engineered link,” then, will require a laser bandwidth metric (like minEMBc) in the model to predict extended reach or system margin.6 With measured values provided in FDD, customers specifying Corning® InfiniCor® fiber can have greater confidence to use industry models to predict laser-based system performance in their networks. For example, Corning® InfiniCor® SX+ fiber has a minimum 2000 MHz.km EMB that is standards-compliant to 300 meters supporting 10 Gb/s transmission, (also commonly known as OM-3 grade fiber7). Effective in 2006, EMB values of up to 3000 MHz.km will be reported in FDD for Corning® InfiniCor® SX+ fibers, which enables different 10 Gb/s engineered link options: • Increased margin with more than 2 dB of additional margin in a 300 meter link (allowing more connector pairs to used), increasing flexibility during installation or reconfiguration options at a later date. • Extra reach, extending the link distance beyond the standard 300 meters up to 400 meters. • More robust and reliable optical infrastructure requiring less maintenance and reduced system down time. Corning® InfiniCor® 50/125 µm fibers The engineered link capabilities enabled by laser bandwidth values in FDD are summarized in Figures 1 and 2 for Corning® InfiniCor® 50/125 µm fibers. Figure 1 describes extended reach capability, and Figure 2 describes system margin enabled by laser bandwidth metrics. Reach capability of Corning® InfiniCor® 50/125 µm fibers. Figure 1 3 A comprehensive overview of popular applications standards is available in Table 3 of the Premises Fiber Selection Guide (WP 1160), available at www.corning.com/opticalfiber. 4 A copy of this excellent model is maintained on the IEEE 802.3 website: http://grouper.ieee.org/groups/802/3/ae/public/index.html. 5 Generally, light sources used in multimode fiber applications include Light-Emitting Diodes (LEDs,), Vertical-Cavity Surface-Emitting Lasers (VCSELs), Fabry-Perot Lasers (FPs), and Distributed Feedback Lasers (DFBs). OFL BW predicts performance with LEDs, RML BW predicts performance with first-generation 850 nm VCSELs, and minEMBc predicts performance with second-generation 850 nm VCSELs. FP and DFB lasers are used in 1300 nm applications, which focus on older, installed-base fibers and do not require engineered links. 6 It is important to note that OFL BW is never suitable for predicting laser-based system performance. For a short history of bandwidth measurement development, please reference Section 5 of the Premises Fiber Selection Guide (WP1160), available at www.corning.com/opticalfiber. 7 2 OM3 in accordance with the Structured Cabling Standard ISO/IEC 11801 Connector margin of Corning® InfiniCor® fibers at 10 Gb/s over 300 meters. Figure 2 Reliability Modern premises networks operate at 1 Gb/s speeds or higher, even to the desktop, and the growth rates of high-speed, short-reach port shipments have outperformed every other segment of the telecommunications industry. Premises port shipments of 1 Gb/s or greater have grown at over 180% CAGR since 1997, and 10 Gb/s shipments alone are expected to grow at over 250% CAGR from 2002 to 2009.8 Owners of laserbased multimode optical fiber networks demand high reliability and low latency from their infrastructure as a top business priority. The cost of network downtime is extraordinarily high, both from the lost revenues of transactions that aren’t taking place and from the cost of using IT resources to fix problems instead of plan for growth. Laser bandwidth performance of multimode fiber is a critical attribute for ensuring optical network reliability. If EMB from installed fibers is lower than required, the network will suffer from increased down time, high bit-error rates (i.e. high packet loss), and higher overall system costs. Since field measurements of laser bandwidth are not always practical or recommended, the best way to demonstrate field performance is via manufacturing measurements that link back into standards, such as minEMBc. A short survey of non-Corning multimode optical fibers in the industry will find many claims for high EMB, but no specifications about how EMB is predicted outside of standards. Corning® InfiniCor® optical fiber is the only laser-optimized™ fiber to specify laser measurement procedures with pass/fail values to ensure laser performance with a direct laser measurement on every meter of every reel, and to provide those measurements to customers as a demonstration of quality control. Summary The advantages of having accurate laser bandwidth values available during network design are multidimensional, and are best realized in close consultation with your cable manufacturer’s application engineering department and with Corning Optical Fiber. In summary, Corning’s laser-optimized™ InfiniCor® fibers maintain the same leading quality and high performance that the world has come to trust, and the availability of effective laser bandwidth values in FDD now provides the following additional advantages: • Certification of laser bandwidth performance on every Corning® InfiniCor® fiber with factory data – an important advantage since in-field bandwidth measurements are not typically recommended nor standardized. • Clear and simple engineering flexibility for network consultants and end users, with the capability to design engineered 1 Gb/s and 10 Gb/s solutions. • Increased confidence in high-performance premises networks, supporting low-latency and “high-uptime.” For more information on these changes, please contact your cable manufacturer or the global Corning Optical Fiber Information Center (COFIC), available online at www.corning.com/opticalfiber/contact_us/. 8 Source: Dell’Oro Group 3 Corning Incorporated www.corning.com/opticalfiber One Riverfront Plaza Corning, NY 14831 U.S.A. Phone: 800-525-2524 (U.S. and Canada) 607-786-8125 (International) Fax: 800-539-3632 (U.S. and Canada) 607-786-8344 (International) Email: [email protected] Europe Berkeley Square House Berkeley Square London W1X 5PE U.K. Phone: 00 800 2800 4800 (U.K., Ireland, France, Germany, The Netherlands, Spain and Sweden) 00 800 781 516 (Italy) +44 7000 280 480 (All other countries) Fax: +44 7000 250 450 Email: [email protected] Asia Pacific Greater China Australia Phone:1-800-148-690 Fax: 1-800-148-568 Beijing Phone: (86) 10-6505-5066 Fax: (86) 10-6505-5077 Indonesia Phone: 001-803-015-721-1261 Fax: 001-803-015-721-1262 Hong Kong Phone: (852) 2807-2723 Fax: (852) 2807-2152 Malaysia Phone: 1-800-80-3156 Fax: 1-800-80-3155 Philippines Phone: 1-800-1-116-0338 Fax: 1-800-1-116-0339 Singapore Phone: 800-1300-955 Fax: 800-1300-956 Shanghai Phone: (86) 21-5467-4666 Fax: (86) 21-5407-5173 Taiwan Phone: (886) 2-2716-0338 Fax: (886) 2-2716-0339 E-mail: [email protected] Thailand Phone: 001-800-1-3-721-1263 Fax: 001-800-1-3-721-1264 Latin America Brazil Phone: 000817-762-4732 Fax: 000817-762-4996 Mexico Phone: 001-800-235-1719 Fax: 001-800-339-1472 Venezuela Phone: 800-1-4418 Fax: 800-1-4419 4 Corning and InfiniCor are registered trademarks of Corning Incorporated, Corning, N.Y. ©2006, Corning Incorporated