Educational Services DWDM Primer - Fujitsu

1 DWDMD ense WavelengthDivision MultiplexingMay 21, 2004 dwdm PrimerAll other products or Services mentioned in this document are identified by the trademarks, service marks, or product names as designated by the companies that market those products or Services or own those marks. Inquiries concerning such products, Services , or marks should be made directly to those companiesThis document and its contents are provided by Fujitsu Network Communications, Inc. (FNC) for guidance purposes only. This document is provided as is with no warranties or representations whatsoever, either express or implied, including without limitation the implied warranties of merchantability and fitness for purpose.

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3 All Rights Reserved. NETSMART is a registered trademark ofFujitsu Network Communications Inc. FLASHWAVE is a registered trademark of Fujitsu Network Communications, is a registered trademark of Fujitsu Network Communications is a registered trademark of Fujitsu Network Communications 21, 2004iTable of ContentsDWDM PrimerFNC and FNC Customer Use OnlyLesson 1: Course DescriptionCourse Description ..1-2 Prerequisite .. Organizations .. 2: dwdm Primer OverviewPurpose .. dwdm ? ..2-5 dwdm Definition ..2-5 Discrete Transport Channels vs. dwdm Transport.

4 2-5 Service Provider Advantages ..2-7 What is a Wavelength? ..2-9 Lesson 3: Wave Division MultiplexingPurpose .. of Multiplexing ..3-5 Time Division Division Multiplexing ..3-7 Varieties of WDM ..3-7 WDM ..3-7 CWDM ..3-7 Optical Multiplexing Technology ..3-9 Optical Multiplexing Filters ..3-9 Lesson 4: Optical 4-3 Objectives .. 4-3 Optical 4-5 Tunable 4-7 Lasers as the Signal 4-9 Safety 4-9 Modulator .. 4-9 Amplifiers and Regeneration .. 4-11 Network Routes and 4-13 Erbium-Doped Fiber Amplifier 4-15 The EDFA Amplifier .. 4-17 Fiber Bands.

5 4-19 Amplifier Requirements .. 4-19 Raman Amplifiers .. 4-21 Distributed 4-21 Lesson 5: Optical Network 5-3 Objectives .. 5-3 Optical Network 5-5 Signal Bandwidth and Filtering .. 5-7 ITU-T 5-7 Impairments to dwdm Transmission .. 5-9 Bit Error Rate .. 5-9 Eye 5-9 Forward Error Correction Solution to BER .. 5-13 Types of FEC .. 5-13In-Band 5-13 Out-of-Band 5-15 Optical Signal-to-Noise 5-17 Fiber Attenuation .. 5-19 Attenuation Loss in S-Band, C-Band, and L-Band .. 5-21 Attenuation of Optical Signal .. 5-23 Signal Amplification .. 5-23iiMay 21, 2004 dwdm PrimerTable of ContentsFNC and FNC Customer Use OnlyCross Talk in dwdm Systems.

6 5-25 Compensating for Cross Talk in dwdm Systems ..5-25 Fiber Dispersion ..5-25 Chromatic ..5-31 Polarization Mode Dispersion ..5-33 PMD Effect ..5-33 Polarization Mode Dispersion Compensation ..5-35 Effective Polarization Mode Dispersion Compensation .5-35 Lesson 6: dwdm Network SolutionsPurpose ..6-3 Reference 7420: The Ideal Metro Access WDM Transport 6-5 System Description ..6-5 System ..6-7 FLASHWAVE 7500: The Metro Core Solution ..6-9 System Description .. Operations ..6-11 Video ..6-11 Broadcast TV on Demand ..6-11 Near Video on Demand.

7 6-11 Subscription Video on Demand ..6-11 Voice ..6-13 Switched Over IP 7500 6-13 Lesson 7: dwdm AcronymsLesson 8: dwdm TermsLesson 9: End of Course 9-2 End of Course Evaluation .. 9-3 dwdm Self-Evaluation .. 9-3 Self-Evaluation Sheet (Electronic) .. 9-6 May 21, 2004iiiList of FiguresDWDM PrimerFNC and FNC Customer Use OnlyFigure 1-1: Support 1-4 Figure 1-2: FOCIS .. 1-6 Figure 2-1: Discrete Channels .. 2-4 Figure 2-2: dwdm Transport .. 2-6 Figure 2-3: Wavelength .. 2-8 Figure 3-1: Time Division 3-4 Figure 3-2: Wavelength Division 3-6 Figure 3-3: WDM 3-8 Figure 4-1: Optical Network 4-4 Figure 4-2: Tunable Laser.

8 4-6 Figure 4-3: Laser Signal Sources .. 4-8 Figure 4-4: 4-10 Figure 4-5: Network 4-12 Figure 4-6: EDFA Model .. 4-14 Figure 4-7: Erbuim-Doped Fiber Amplifier .. 4-16 Figure 4-8: Fiber Bands and Amplifiers .. 4-18 Figure 4-9: Distributed Raman 4-20 Figure 5-1: Optical Network 5-4 Figure 5-2: Signal 5-6 Figure 5-3: Eye Pattern vs. Data 5-8 Figure 5-4: Eye Pattern 5-10 Figure 5-5: Forward Error 5-12 Figure 5-6: OOB-FEC Example .. 5-14 Figure 5-7: OSNR .. 5-16 Figure 5-8: Fiber Attenuation .. 5-18 Figure 5-9: Fiber Signal Loss in S-Band, C-Band, and L-Band.

9 5-20 Figure 5-10: Power 5-22 Figure 5-11: Dispersion and WDM .. 5-24 Figure 5-12: Chromatic Dispersion .. 5-26 Figure 5-13: Compensation 5-28 Figure 5-14: 5-30 Figure 5-15: Polarization Mode 5-32 Figure 5-16: PMD Compensation .. 5-34 Figure 6-1: FLASHWAVE 6-4 Figure 6-2: FLASHWAVE 7420 Ring .. 6-6 Figure 6-3: FLASHWAVE 6-8 Figure 6-4: Multiservice Operations 6-10 Figure 6-5: MSO Network Solution .. 6-12ivMay 21, 2004 dwdm PrimerList of TablesFNC and FNC Customer Use OnlyTable 1: dwdm Acronyms .. 7-2 Table 1: dwdm Terms .. 8-2 Table 1: Answers.

10 9-6 Lesson 1 Course Description1-2 May 21, 2004 dwdm PrimerCourse DescriptionFNC and FNC Customer Use OnlyCourse DescriptionNameDense Wavelength Division Multiplexing PrimerPurposeThe purpose of the dwdm Primer course is to provide an introduction to dense wavelength division multiplexing ( dwdm ). Additionally, this course will discuss why dwdm is an important innovation in optical networks and the benefits it can there are no formal prerequisites for this course, the following make the course more meaningful, as an in-depth analysis of these subjects is beyond the scope of dwdm Primer course: SONET knowledge and experience Ethernet knowledge and experienceObjectivesAfter completing this course, the student should be able to.