Dense Wavelength Division Multiplexing Theory. What we will cover WDM Overview Optical Fiber...

of 34 /34
Dense Wavelength Division Multiplexing Theory

Embed Size (px)

Transcript of Dense Wavelength Division Multiplexing Theory. What we will cover WDM Overview Optical Fiber...

  • Slide 1
  • Dense Wavelength Division Multiplexing Theory
  • Slide 2
  • What we will cover WDM Overview Optical Fiber Transmission Characteristics Key technologies of DWDM Technical Specifications
  • Slide 3
  • Background WDM TDM SDM
  • Slide 4
  • PDH SDH DWDM 155M622M2.5G10G G.957G.691 G.692 PDH, SDH and DWDM
  • Slide 5
  • IP ATM SDH DWDM Physical Fiber DWDM Physical Fiber Open Optical Interface SDH ATM IP Other Relationship between DWDM and Other Services
  • Slide 6
  • WDM Definition WDM enables transmitting multiple optical carriers with information (analog or digital) on one fiber N 2 1 N 2 1 N 2 1 OMU ODU OA
  • Slide 7
  • DWDM Concept Dense wavelength division multiplexing (DWDM) Power ( dBm) 1529 - 1560nm (nm) wavelength interval 0.8 2nm
  • Slide 8
  • DWDM System OTU1 Input Ch 1 Ch N Ch 1 Ch N 1111 nnnn OTUn OMU BA LA PA ODU 1111 nnnn OTU1 OTUn s s s s OSC OSCOSC Output EMS Optical Transmitter OLA Optical Receiver
  • Slide 9
  • Common Network Elements in DWDM Optical Terminal Multiplexer (OTM) Optical Line Amplifier (OLA) Optical Add/Drop Multiplexer (OADM)
  • Slide 10
  • Optical Terminal Multiplexer (OTM) Client side Line side 11 nn 11 nn OTM At the transmitter end, the OTM: Multiplexes the STM-N signals of N wavelengths 1 ~ N into a DWDM main optical channel Amplifies the optical power of the main channel via the multiplexer Adds an optical supervisory channel s At the receiving end, the OTM: Extracts the optical supervisory channel s DWDM main optical channel is amplified and de-multiplexed into STM- N signals of the N different wavelengths
  • Slide 11
  • Optical Line Amplifier (OLA) OLA is configured in each direction of the fiber link OLA extracts the optical supervisory channel (OSC) and processes it It then amplifies the main optical channel signals, multiplexes them with the optical supervisory channel and sends them onto the fiber Line side OLA
  • Slide 12
  • Optical Add/Drop Multiplexer (OADM) OADM performs add/drop of wavelengths Client side Line side 11 nn 11 nn OADM
  • Slide 13
  • Operational Wavelength Range O BandOriginal1260-1360 nm E BandExtended1360-1460 nm S BandShort1460-1530 nm C BandConventional1530-1565 nm L BandLong1565-1625 nm U BandUltralong1625-1675 nm
  • Slide 14
  • Division Of Low-Loss Window
  • Slide 15
  • Feature Comparison between Low-Loss Windows WindowIIIIIIIVV Mark (nm)850 1310 (O band) 1550 (C band)1600 (L band) 1360 ~ 1530 (E + S bands) Wavelength range (nm) 600~9001260~13601530~15651565~1625 1360~1530 Fiber typeMMF MMF/G.652/ G.653 G.652/G.653/ G.655 Full-wave fiber Applications Short distance and low rate Long distance and high rate
  • Slide 16
  • Slide 17
  • Wavelength Allocation On C-Band No.Central Frequency (THz)Wavelength (nm) 1192.11560.61 2192.21559.79 3192.31558.98 4192.41558.17 5192.51557.36 6192.61556.55 7192.71555.75 8192.81554.94 9192.91554.13 10193.01553.33 11193.11552.52 12193.21551.72 13193.31550.92 14193.41550.12 15193.51549.32 16193.61548.51 17193.71547.72 18193.81546.92 19193.91546.12 20194.01545.32 40 Channels / 100 GHz interval
  • Slide 18
  • Wavelength Allocation On C-Band 40 Channels / 100 GHz interval 21194.11544.53 22194.21543.73 23194.31542.94 24194.41542.14 25194.51541.35 26194.61540.56 27194.71539.77 28194.81538.98 29194.91538.19 30195.01537.40 31195.11536.61 32195.21535.82 33195.31535.04 34195.41534.25 35195.51533.47 36195.61532.68 37195.71531.90 38195.81531.12 39195.91530.33 40196.01529.55
  • Slide 19
  • TDM Electrical Regenerator for Single Wavelength DWDM Multi-wavelength on Single Fiber, for Optical Amplification DWDM vs. SDH T T R R 1 Electrical MultiplexElectrical Demultiplex TransmitterReceiver Electrical Regenerator N 2 1 N 2 1 N 2 1 Optical Multiplexer Optical Demultiplexer OA
  • Slide 20
  • 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 SDHDWDM
  • Slide 21
  • DWDM Features Through super-long distance transmission technologies, the transmission cost is reduced SDH DWDM Electrical Regenerator Light Amplifier
  • Slide 22
  • DWDM Features 8*2.5G 32*2.5G 16*2.5G 32*10G
  • Slide 23
  • Key technologies of DWDM
  • Slide 24
  • DWDM System OTU1 Input Ch 1 Ch N Ch 1 Ch N 1111 nnnn OTUn OMU BA LA PA ODU 1111 nnnn OTU1 OTUn s s s s OSC OSCOSC Output EMS Optical Transmitter OLA Optical Receiver
  • Slide 25
  • Key Technologies Of DWDM Optical Source Optical Multiplexer And De-multiplexer Optical Amplifiers The Supervision Of WDM System
  • Slide 26
  • Optical Source Requirements of optical sources: Larger dispersion tolerance value Standard and stable wavelength Types of optical sources: Light Emitting Diode (LED) Laser Diode (LD)
  • Slide 27
  • Optical Multiplexing and De-multiplexing Technology
  • Slide 28
  • Optical Multiplexer and Demultiplexer Multiplexer Fiber Demultiplexer
  • Slide 29
  • Supervision System Technology
  • Slide 30
  • Supervision System Detection, control and management are basic requirements of all network operations To ensure secure operation of DWDM system, physically, the monitoring system is designed as an independent system separated from working channels and devices Used to transmit the NE management and supervision information related to DWDM system
  • Slide 31
  • Functions Fault alarm Fault location Quality parameter supervision in the operation Control over backup line upon line interruption EDFA supervision
  • Slide 32
  • Optical Supervision Control (OSC) OMUODU OBA OPA OBA ODUOMU OLA OSC
  • Slide 33
  • Optical Supervision Control (OSC) 1510nm Signal speed :2.048Mb/s Receiving sensitivity :-48dbm Transmission power :0 ~ -7 dbm
  • Slide 34
  • THANK YOU