光纖通信課程設(shè)計extra

1、Fiber Optic Network DesignX. Wu, M. Y. Li, C. S. YanDept. of Opt. Engr., ZJU2012Class 14Topic: Metro NetworksOutlineIntroductionDesign ConsiderationsCompensation SchemesCrosstalkCase StudiesA High Level ViewTopology: Ring and MeshKey RequirementsFeatures of Long haul v.s. MetroComponents SelectionDe

2、sign ConsiderationsTopologiesBasic RingTypical LossesEM,DM ?An example1000Without Amplifier OptionSelf Phase ModulationXPM: Cross Phase Modulation and FWMStimulated Raman and BrillouinWith Amplifiers: Lumped v.s. Per nodeMigrating to 10Gb/sLumped DCF v.s. at each nodeRing Circumference: 200kmLook in

3、sideExample: Inter-channel CrosstalkInterchannel CrosstalkPositiveNegative-15dB10GHz40GHzTodays Task: 10Gb/s systemQ1: at what ring circumference will lumped DCF compensation be close to the compensation per node?Q2: Observe Crosstalk with two adjacent channelsPower Panelty v.s. DispersionSummarySin

4、ce many of you are going to school overseasAmerican historian Prof. James J. Martin called the incarceration program a breach of the Bill of Rights on a scale so large as to beggar the sum total of all such violations from the beginning of the United States down to that time. Roosevelt authorized, s

5、upported and maintained an action which he knew to be racist and blatantly unconstitutional. But this was only one more sterling example of the gross hypocrisy which characterized his entire regime.The man responsible for implementing the evacuation, Lt. Gen. DeWitt, declared: “In the war in which w

6、e are now engaged, racial affinities are not severed by migration. The Japanese race is an enemy race and while many second and third generation Japanese born on United States soil, possessed of United States citizenship, have e Americanized, the racial strains are undiluted . It therefore follows t

7、hat along the vital Pacific Coast over 112 000 potential enemies of Japanese extraction are at large today.”Secretary of War Henry L. Stimson was more succinct: Their racial characteristics are such that we cannot understand or trust even the citizen Japanese.It will happen again, its just a question of whenIt was really cruel and harsh. To pack and evacuate in forty-eight hours was an impossibility. Seeing mothers completely bewildered with children crying from want and peddlers taking advantage and offering prices next to robbery made me feel like murdering those res