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Dense Wavelength Division Multiplexing

Dense Wavelength Division Multiplexing. Theory. What we will cover. WDM Overview Optical Fiber Transmission Characteristics Key technologies of DWDM Technical Specifications. Background. WDM. TDM. SDM. G.692. DWDM. G.957. G.691. SDH. 155M. 622M. 2.5G. 10G. PDH.

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Dense Wavelength Division Multiplexing

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  1. Dense Wavelength Division Multiplexing Theory

  2. What we will cover • WDM Overview • Optical Fiber Transmission Characteristics • Key technologies of DWDM • Technical Specifications

  3. Background WDM TDM SDM

  4. G.692 DWDM G.957 G.691 SDH 155M 622M 2.5G 10G PDH PDH, SDH and DWDM

  5. IP Other IP SDH ATM ATM Open Optical Interface SDH DWDM Physical Fiber Relationship between DWDM and Other Services

  6. l1 l2 lN l1 l1 l2 l2 lN lN OA ODU OMU WDM Definition • WDM enables transmitting multiple optical carriers with information (analog or digital) on one fiber

  7. Power (dBm) wavelength interval ：0.8～2nm 1529 - 1560nm λ(nm) DWDM Concept • Dense wavelength division multiplexing (DWDM)

  8. Optical Transmitter Optical Receiver OLA Ch 1 Ch 1 λ1 λ1 OTU1 OTU1 OMU LA PA ODU Input Output ┇ ┇ BA λs Ch N λs λs λs Ch N OTUn OTUn λn λn OSC OSC OSC EMS DWDM System

  9. Common Network Elements in DWDM • Optical Terminal Multiplexer (OTM) • Optical Line Amplifier (OLA) • Optical Add/Drop Multiplexer (OADM)

  10. Client side Line side λ1 λn λ1 λn OTM Optical Terminal Multiplexer (OTM) • At the transmitter end, the OTM: • Multiplexes the STM-N signals of “N” wavelengths λ1~λN into a DWDM main optical channel • Amplifies the optical power of the main channel via the multiplexer • Adds an optical supervisory channel λs • At the receiving end, the OTM: • Extracts the optical supervisory channel λs • DWDM main optical channel is amplified and de-multiplexed into STM-N signals of the N different wavelengths

  11. Line side Line side OLA 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

  12. Line side Line side λ1 λn λ1 λn Client side OADM Optical Add/Drop Multiplexer (OADM) • OADM performs add/drop of wavelengths

  13. Operational Wavelength Range

  14. Division Of Low-Loss Window

  15. Feature Comparison between Low-Loss Windows

  16. Wavelength Allocation On C-Band 40 Channels / 100 GHz interval

  17. Wavelength Allocation On C-Band 40 Channels / 100 GHz interval

  18. Electrical Regenerator Transmitter Receiver l1 R T Electrical Multiplex Electrical Demultiplex l1 l2 lN l1 l1 l2 l2 OA lN lN Optical Demultiplexer Optical Multiplexer DWDM vs. SDH • DWDM • Multi-wavelength on Single Fiber, for Optical Amplification • TDM • Electrical Regenerator for Single Wavelength

  19. 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 SDH DWDM

  20. SDH DWDM Electrical Regenerator Light Amplifier DWDM Features • Through super-long distance transmission technologies, the transmission cost is reduced

  21. 32*10G 32*2.5G 16*2.5G 8*2.5G DWDM Features

  22. Key technologies of DWDM

  23. Optical Transmitter Optical Receiver OLA Ch 1 Ch 1 λ1 λ1 OTU1 OTU1 OMU PA LA ODU Input Output ┇ ┇ BA λs λs λs λs Ch N Ch N OTUn OTUn λn λn OSC OSC OSC EMS DWDM System

  24. Key Technologies Of DWDM • Optical Source • Optical Multiplexer And De-multiplexer • Optical Amplifiers • The Supervision Of WDM System

  25. 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)

  26. Optical Multiplexing and De-multiplexing Technology

  27. Multiplexer Demultiplexer Fiber Optical Multiplexer and Demultiplexer

  28. Supervision System Technology

  29. 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

  30. Functions • Fault alarm • Fault location • Quality parameter supervision in the operation • Control over backup line upon line interruption • EDFA supervision

  31. OPA OBA OLA OLA OLA • OMU • ODU OSC OSC OSC OSC OSC • ODU • OMU OPA OLA OLA OLA OBA Optical Supervision Control (OSC)

  32. Optical Supervision Control (OSC) • 1510nm • Signal speed : 2.048Mb/s • Receiving sensitivity : -48dbm • Transmission power : 0 ~ -7 dbm

  33. THANK YOU

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