Chapter15 DWDM

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BSNL DWDM Handout

Transcript of Chapter15 DWDM

  • E1E1--E2 (CFA) E2 (CFA)

    For internal circulation of BSNL only

    DWDMDWDM

  • WELCOME

    This is a presentation for the E1-E2 CFA Module for the

    Topic: DWDM

    Eligibility: Those who have got the Up gradation from

    E1 to E2.

    This presentation is last updated on 28-3-2011. This presentation is last updated on 28-3-2011.

    You can also visit the Digital library of BSNL to see this

    topic.

    For internal circulation of BSNL only

  • Agenda

    Introduction

    Development of DWDM Technology

    Varieties of WDM

    DWDM System Function

    Transmission Windows

    DWDM System Components

    Benefits of DWDM

    Conclusion

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  • Introduction

    One of the major issues in the networking industry

    today is tremendous demand for more and more

    bandwidth.

    Before the introduction of optical networks, the reduced

    availability of fibers became a big problem for theavailability of fibers became a big problem for the

    network providers.

    Dense wavelength-division multiplexing (DWDM)

    revolutionized transmission technology by increasing

    the capacity signal of embedded fiber.

    For internal circulation of BSNL only

  • Introduction

    The existing SONET/SDH network architecture is best

    suited for voice traffic rather than todays high-speed data

    traffic.

    To upgrade the system to handle this kind of traffic is

    very expensive and hence the need for the developmentvery expensive and hence the need for the development

    of an intelligent all-optical network.

    Dense wavelength division multiplexing (DWDM) is a

    fiber-optic transmission technique that employs multiple

    light wavelengths to transmit data in parallel through a

    single fiber.For internal circulation of BSNL only

  • Introduction

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  • Development of DWDM Technology

    Early WDM began in the late 1980s using the two widely

    spaced wavelengths in the 1310 nm and 1550 nm (or

    850 nm and 1310 nm) regions, sometimes called

    wideband WDM.wideband WDM.

    The early 1990s saw a second generation of WDM,

    sometimes called narrowband WDM, in which two to

    eight channels were used.

    For internal circulation of BSNL only

  • Development of DWDM Technology

    By the mid-1990s, dense WDM (DWDM) systems were

    emerging with 16 to 40 channels and spacing from 100

    to 200 GHz.

    By the late 1990s DWDM systems had evolved to the By the late 1990s DWDM systems had evolved to the

    point where they were capable of 64 to 160 parallel

    channels, densely packed at 50 or even 25 GHz

    intervals.

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  • Development of DWDM Technology

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  • Varieties of WDM

    1. WDM

    Traditional, passive WDM systems are widespread

    with 2, 4, 8, 12, and 16 channel counts being the

    normal deployments.

    2. CWDM2. CWDM

    Today, coarse WDM (CWDM) typically uses 20-nm

    spacing (3000 GHz) of up to 18 channels.

    The CWDM grid is made up of 18 wavelengths

    defined within the range 1270 nm to 1610 nm spaced

    by 20 nm.For internal circulation of BSNL only

  • Varieties of WDM

    3. DWDM

    Dense WDM common spacing may be 200, 100, 50,

    or 25 GHz with channel count reaching up to 128 or

    more channels at distances of several thousand

    kilometers with amplification and regeneration along

    such a route.

    For internal circulation of BSNL only

  • Varieties of WDM

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  • DWDM System Function

    Dense wavelength division multiplexing systems allow

    many discrete transports channels by combining and

    transmitting multiple signals simultaneously at different

    wavelengths on the same fiber.

    In effect, one fiber is transformed into multiple virtual

    fibers.

    So, if you were to multiplex 32 STM-16 signals into one

    fiber, you would increase the carrying capacity of that

    fiber from 2.5 Gb/s to 80 Gb/s.

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  • DWDM System Function

    A key advantage to DWDM is that it's protocol and bit

    rate-independent. DWDM-based networks can transmit

    data in SDH, IP, ATM and Ethernet etc.

    Therefore, DWDM-based networks can carry different

    types of traffic at different speeds over an optical

    channel. DWDM is a core technology in an optical

    transport network.

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  • DWDM System Function

    Any Speed---------------------------------Any Protocol

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  • DWDM System Function

    Transparent transmission

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  • DWDM System Function

    Dense WDM common spacing may be

    200 GHz or 1.6 nm,

    100 GHz or 0.8 nm,

    50 GHz or 0.4 nm,

    25 GHz with channel count reaching up to 128 or

    more channels at distances of several thousand

    kilometers with amplification and regeneration along

    such a route.

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  • DWDM System Function

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    Supports optical data protocols including SDH, ESCON,

    FICON, Fibre Channel, GigE, Digital Video, Fast Ethernet etc.

  • Transmission Windows

    In Future, the

    communication window

    1280~1625nm

    C-band1525~1565nmL-band 1565~1625nm

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  • Transmission Windows

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  • Overview of DWDM

    DWDM systems in enabling service providers to

    accommodate consumer demand for ever-increasing

    amounts of bandwidth.

    DWDM allows the transmission of different formats

    like Internet protocol (IP), asynchronous transferlike Internet protocol (IP), asynchronous transfer

    mode (ATM), and synchronous digital hierarchy

    (SDH), respectively, over the optical layer.

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  • DWDM System Components

    Transmitter (transmit transponder)

    Optical Multiplexer/ demultiplexer

    Optical Amplifier

    Optical fiber (media)

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    Receiver (receive transponder)

  • DWDM System Components

    Transmitter (transmit transponder)

    Changes electrical bits to optical pulses

    Uses a narrowband laser to generate the optical

    pulse

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  • DWDM System Components

    Optical Multiplexer/ demultiplexer

    Combines/separates discrete wavelengths

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  • DWDM System Components

    Optical Amplifier

    Pre-amplifier, Post-amplifier and In line amplifiers

    (ILA)

    EDFA (Eribium Doped Fiber Amplifier) is the

    most popular amplifier.

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    most popular amplifier.

  • DWDM System Components

    Optical Fiber (Media)

    Transmission media to carry optical pulses

    Many different kinds of fiber are used

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  • DWDM System Components

    Receiver (receive transponder)

    Changes optical pulses back to electrical bits

    Uses wideband laser to provide the optical pulse

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  • Benefits of DWDM

    Increases bandwidth (speed and distance)

    Does not require replacement or upgrade their existing

    legacy systems

    Provides "next generation" technologies to meet growing

    data needs

    Less costly in the long run because increased fiber

    capacity is automatically available; don't have to upgrade

    all the time

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  • Conclusion

    DWDM promises to solve the "fiber exhaust" problem

    and is expected to be the central technology in the all-

    optical networks of the future.

    This technology responds to the growing need for This technology responds to the growing need for

    efficient and capable data transmission by working with

    different formats, such as SONET/SDH, while increasing

    bandwidth.

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  • TThank hank yyou!ou!

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    TThank hank yyou!ou!