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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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Presentation Transcript
what we will cover
What we will cover
  • WDM Overview
  • Optical Fiber Transmission Characteristics
  • Key technologies of DWDM
  • Technical Specifications
background
Background

WDM

TDM

SDM

pdh sdh and dwdm

G.692

DWDM

G.957

G.691

SDH

155M

622M

2.5G

10G

PDH

PDH, SDH and DWDM
relationship between dwdm and other services

IP

Other

IP

SDH

ATM

ATM

Open Optical Interface

SDH

DWDM

Physical Fiber

Relationship between DWDM and Other Services
wdm definition

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
dwdm concept

Power (dBm)

wavelength interval :0.8~2nm

1529 - 1560nm λ(nm)

DWDM Concept
  • Dense wavelength division multiplexing (DWDM)
dwdm system

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
common network elements in dwdm
Common Network Elements in DWDM
  • Optical Terminal Multiplexer (OTM)
  • Optical Line Amplifier (OLA)
  • Optical Add/Drop Multiplexer (OADM)
optical terminal multiplexer otm

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
optical line amplifier ola

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
optical add drop multiplexer oadm

Line side

Line side

λ1

λn

λ1

λn

Client side

OADM

Optical Add/Drop Multiplexer (OADM)
  • OADM performs add/drop of wavelengths
wavelength allocation on c band
Wavelength Allocation On C-Band

40 Channels / 100 GHz interval

wavelength allocation on c band1
Wavelength Allocation On C-Band

40 Channels / 100 GHz interval

dwdm vs sdh

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
dwdm features
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

dwdm features1

SDH

DWDM

Electrical Regenerator

Light Amplifier

DWDM Features
  • Through super-long distance transmission technologies, the transmission cost is reduced
dwdm features2

32*10G

32*2.5G

16*2.5G

8*2.5G

DWDM Features
dwdm system1

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
key technologies of dwdm1
Key Technologies Of DWDM
  • Optical Source
  • Optical Multiplexer And De-multiplexer
  • Optical Amplifiers
  • The Supervision Of WDM System
optical source
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)
supervision system
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
functions
Functions
  • Fault alarm
  • Fault location
  • Quality parameter supervision in the operation
  • Control over backup line upon line interruption
  • EDFA supervision
optical supervision control osc

OPA

OBA

OLA

OLA

OLA

  • OMU
  • ODU

OSC

OSC

OSC

OSC

OSC

  • ODU
  • OMU

OPA

OLA

OLA

OLA

OBA

Optical Supervision Control (OSC)
optical supervision control osc1
Optical Supervision Control (OSC)
  • 1510nm
  • Signal speed : 2.048Mb/s
  • Receiving sensitivity : -48dbm
  • Transmission power : 0 ~ -7 dbm