NG-Transport Tech Lecture15-16.ppt

71 g652 non dispersion shifted single mode fiber g653

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71 G.652 Non-Dispersion Shifted Single Mode Fiber G.653 Dispersion Shifted Fiber Single Mode Fiber, DSF G.654 Cut-off Wavelength Shifted Single Mode Fiber G.655 Nonzero Dispersion Shifted Single Mode Fiber Types of fibers – ITU Recommendations
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72 T T R R 1 Electrical Multiplex Electrical Demultiplexer Transmitter Receiver Electrical Regenerator N 2 1 N 2 1 N 2 1 Optical Multiplexer Optical Demultiplexer OA TDM: Electrical Regenerator for Single Wavelength DWDM: Multi-wavelength on Single Fiber, for Optical Amplification Difference between DWDM and SDH
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73 DWDM Features Large transparent transmission capacity greatly saves fiber resources. Each wavelength can carry different signal: SDH 2.5Gbps, 10 Gbps, ATM, IP. DWDM technology provides multiple virtual fiber channels in one physical fiber channel.
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74 DWDM Features SDH DWDM Electrical Regenerator Light Amplifier Through super-long distance transmission technologies, the transmission cost is reduced.
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75 DWDM Features 8*2.5G 32*2.5G 16*2.5G 32*10G
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76 OADM OTM OXC OXC 1 2 N 1 2 N i i k k DWDM Development Trend Full optical network is the development trend of optical transport network.
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77 OTU1 OTU1 OTU1 OTU1 Input Ch 1 Ch N Ch 1 Ch N λ 1 λ n n OTUn OTUn OTUn OMU OMU BA BA LA LA PA PA ODU ODU λ 1 λ n n OTU1 OTU1 OTUn OTUn OTUn OTUn λs λs λs λs λs λs λs OSC OSC OSC OSC Output EMS Optical Transmitter OLA Optical Receiver DWDM system
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78 Optical source Optical Mutiplexer And Demultiplexer Optical Amplifiers The Supervision Of WDM System Key Components of DWDM
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79 Optical Muliplexer and Demultiplexer Multiplexer Fiber Demultiplexer
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80 Optical Amplifier Its development overcame the biggest barrier on high speed long distance transmission - receiving optical power limit It amplifies all the wavelength at once and without optical-electrical-optical conversion
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81 Working Principle 980 nm pump light 1550 nm signal light 1480nm 1550 nm stimulated emission N 1 N 3 ~0 N 2
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82 EDFA Composition Used to suppress light reflection to ensure stable working of the optical amplifier The optical signal stimulates the unstable Erbium ions to release the excess energy as photons in phase and at the same wavelength. As this process continues down the fiber, the signal grows stronger. Generates pump light that stimulates the erbium atoms to release their stored energy as additional 1550 nm Used to combine signal light with pump light Isolator Coupler Isolator Erbium Doped Fiber P IN P OUT Pump Laser Pump light is typically 1480 nm or 980 nm
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83 (EDFA) EDFA includes: Optical Booster Amplifier (OBA) - high optical output power Optical Line Amplifier (OLA) - compensate the loss of the transmission line Optical Pre Amplifier (OPA) - low noise λ 1 λ 2 λ n OBA λ 1 λ 2 λ n OLA OPA OLA O M U O M U
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84 Network Element types of DWDM OTM OTM Optical Terminal Multiplexer OLA OLA Optical Line Amplifier OADM OADM Optical Add Drop Multiplexer REG REG Electrical Regenerator
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85 O T M O T M 1.OTM OADM 2.OADM 3.OLA 4.REG R E G R E G WDM NE Types 5.ROADM ?
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  • Fall '19
  • Synchronous optical networking, Multiplexing, Wavelength-division multiplexing, osc, NG SDH

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