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1 Laser 2000 WDM short form tutorial How to increase your bandwidth beyond the 1300/1500 upgrade? What about DWDM ?

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  • 1Laser 2000 WDM short form tutorialHow to increase your bandwidth beyond

    the 1300/1500 upgrade?

    What about DWDM ?

  • 2Plan

    Basics, WDM technology Passive optics Active componants CWDM amplifiers Applications Upgrade to DWDM Exemples of integration

  • 3Basics, WDM Technology

  • 4Standard optical network

  • 5Optical Network Basics

    Two Fiber Rings for protection Unidirectional or bidirectional

    Topology Ring (physically ring, logically point to point) Point to Point

    Distance Link Budget Losses

    Protection (failover in either direction) Transparency Scalability

  • 6Optical Link Budgets

    Determining the Link Budget will get you the transmission distance (highly depend on your fiber loss)

    Calculation Add Laser TX power to Rx Sensitivity of transceiver Subtract all points of signal loss Total equals Link Budget Transmission distance is Link Budget / 0.25 dB

    attenuation (std @1550nm) per Km of fiber

  • 7Exemple of link budget calculation

    1 5 1 0 n m O A D M

    1 5 1 0 n mS F P

    1 5 1 0 n m S F P

    1 5 1 0 1 5 5 01 4 7 0 1 5 9 0

    M U X / D E M U X - 4

    1 4 7 0 n mS F P

    1 4 7 0 n mS F P

    1 4 7 0 n mO A D M

    E q u i p m e n t

    E q u i p m e n t

    E q u i p m e n t

    N O D E 2

    N O D E 3

    H E A D E N D

    W E S T

    E A S TE A S T

    W E S T

    W E S T

    N E T

    T x P o w e r = 0 d B

    1 . 7 d B

    1 . 5 d B 1 . 5 d B

    0 . 5 d B 0 . 5 d B

    0 . 5 d B

    0 . 5 d B

    R x s e n s i t v i t y = 2 4 d B

    R x s e n s i t i v i t y + T x P o w e r 0 + 2 4 = 2 4 . 0 d B

    M U X / D E M U X A d d I n s e r t i o n L o s s 1 . 7 d BO A D M D r o p P a s s T h r u L o s s 1 . 5 d BO A D M D r o p I n s e r t i o n L o s s 1 . 5 d BP a t c h P a n e l L o s s 2 . 0 d BN e t w o r k S p l i c e s 2 . 0 d BS i g m a 1 . 2 d B

    M a r g i n 2 . 0 d B

    L i n k B u d g e t = ( R x s e n s i t i v i t y + T x P o w e r ) - S i g n a l l o s s e s - M a r g i nL i n k B u d g e t = 2 4 d b - 9 . 9 d B - 2 . 0 d B = 1 2 . 1 d B

    M a x i m u m t r a n s m i s s i o n d i s t a n c e = L i n k B u d g e t / a t t e n u a t i o n p e r K mM a x i m u m t r a n s m i s s i o n d i s t a n c e = 1 2 . 1 d B / 0 . 2 5 = 4 8 . 4 K m

  • 8When do you need CWDM ?

    CWDM is used when you need more bandwidth inyour fiber. A cheap & easy solution could be to use 1300/1500 bidirectional transmissions (accessapplications, generally used for videotransmission) but you get limited in distances, datarate and flexibility.

  • 9What is the WDM technology ?

    The Wavelength Multiplexing technology allows you togather different wavelengths coming from different fibersinto one fiber.

    You have then the flexibility to add or drop eachwavelength at some points in the network.

    In order to upgrade your system, you need to have dedicated emitters (lasers) and passive components that willdo the mutliplexing and demultiplexing. Those passivecomponents do not need power nor electronics and aretotally independant of the transmission protocol.

  • 10

    Difference between CWDM andDWDM

    In order to reduce cost, the standard Coarse WDM has been developped.

    Each wavelength of the CWDM ITU grid has been definedas being 20nm apart from each other (from 1270nm to 1610nm) compared to the Dense WDM grid which stateswavelength spacing of 0.4nm (50Ghz), 0.8nm (100Ghz) and 1.6nm (200Ghz) (from 1525 to 1615nm).

    The cost saving is both in the laser and the passivecomponents, plus in the management.

  • 11

    CWDM to DWDM Comparisons

    Cost CWDM 70% to 50% less than DWDM for the

    components 3 to 5 times cheaper at the system management level

    Standard applications CWDM: Metro Access, Enterprise DWDM: Metro Core, Metro Access (SONET)

  • 12

    CWDM Q & A1. What is WDM ?

    Ans: (1) CWDM:Coarse Wavelength Division Multiplexer

    = 20 nm spacing, 4 ~8 Channel

    (2) DWDM:Dense Wavelength Division Multiplexer

    < 0,8 nm spacing, 8 Channels and above.

    2. How many types of CWDM transmitting architecture exist ?

    Ans: (1) Bi-Directional (both directions in one fiber)

    (2) Uni-Directional (one direction per fiber)

    3. What wavelengths are usually applied in CWDM solution?

    Ans: (1) 4 Channel:1510,1530,1550,1570 nm

    (2) 8 Channel:1470,1490,1510,1530,1550,1570,1590,1610 nm

  • 13

    4. How does CWDM apply in Network Hierarchy ?

    Ans: From Metro network to Access end.

    5. What is difference between CWDM DFB and DFB Laser (DWDM)?

    Ans: The requirement of temperature wavelength drift is different.

    For normal CWDM, the temperature wavelength drift is

    between -6 ~ 7.5 nm (uncooled DFB lasers instead of cooled ones)

    ex : 1510 nm , operation temperature 0 ~ 70

    In the case of 0 , temperature wavelength drift is 1510+(-6)=1504 nm

    In the case of 70 ,temperature wavelength drift is 1510+7.5=1517.5 nm

  • 14

    6. What is the operating temperature of CWDM?

    Ans: 0 ~ 70

    7. What is the production process of CWDM Passive components ?

    Ans: (1) Fusion

    (2) Thin Film Filter

    8. What is the difference between MUX and DeMUX?

    Ans: MUX: Optical passive component that combines wavelengthstraveling on separate fibers into single fiber.

    DeMUX : Optical passive component that separates different wavelength from single fiber and routes them into different fibers.

    1 1470nm

    8 1610nm

    CWDM

    MUX

    CWDM

    DMUX

    1

    8

  • 15

    Passive optics

  • 16

    CWDM Passive Optics Specs

    Insertion Loss MUX 2 3dB with coupler design DEMUX 2 4dB with filter design OADM pass through 2dB max

    Isolation DEMUX - channel to adjacent channel 50dB MUX - channel to adjacent channel 8dB

    Passband 12-14nm wide Ripple

  • 17

    CWDM Passive Components

    Available as modules or System solution

    Available as modules or System solution

  • 18

    Mux/Demux Plug-in Front Panel

  • 19

    OADM Plug-in

    The optical Add/drop allows to add and drop one channel or more to access dedicated customers

    Available in 8 wavelengths Passive device, No power or electronics Both an east and a west transport path can be created for protection Used in a ring configuration with the MUX/DEMUX Plug-in

  • 20

    Single lambda OADM diagram

    RXTX

    ToCWDM

    SFP

    TX TX RXRX

    To NetworkTo NetworkCWDM OADM-1

    RX

    EAST WEST

    ToCWDM

    SFP

    TX

    Equipment Side

  • 21

    Clip Mounting new technology

  • 22

    Patch-Mux- New technology

    Reduced package design

    Mux/Demux directly put into a patchcord.

    Dedicated to an easy upgrade

    Ease Of Use

  • 23

    Active components

  • 24

    CWDM Transceiver Specs

    Operate at data rates from 100 Mbps to 2.7Gbps DFB uncooled lasers in 16 wavelengths

    1270nm to 1610nm at 20nm spacing

    Receiver - PIN 20dB min, APD 30dB min TX power 0 to +1 dB min Available optical budget :

    19dB, 23dB, 30dB

  • 25

    Available in discrete components or in transceivers

    1*9

    GBIC

    Coax

    SFP- mini-GBIC

  • 26

    How to implement them into yourlegacy network?

    It could not be simpler : Just replace your standard product with a CWDM

    (colored) GBIC or laser. Connect each one of them to the passive box . Repeat this operation on the other side of the line for the

    demux. Done.

  • 27

    CWDM amplifier

  • 28

    LOA

    Semi-conductor amplifer (different from the EDFAtechnology)

    Small size Low cost Linear

    Accommodates any data rate without crosstalk Handles multiple wavelengths without crosstalk Operates in switched networks without gain transients

  • 29

    Mux / Demux elements create loss

    SolutionTx

    Tx

    Tx

    Tx

    Transmitter Boost

    Rx

    Rx

    Rx

    Rx

    Receiver preamplifier

    Low cost unique CWDM amplifier

    Insertion lossInsertion loss

    Tx

    Tx

    Tx

    Tx

    CWDM Mux

    Rx

    CWDM Demux

    Rx

    Rx

    Rxx km

  • 30

    The Linear Optical Amplifier (LOA)

  • 31

    CWDM Applications

  • 32

    Point to Point Network

    Carrier Hotel Site A

    Finisar MUX

    Carrier Hotel Site B

    Finisar MUX

    Switch Switch Switch Switch

  • 33

    Point to Point operation

    1 5 1 0 1 5 5 01 4 7 0 1 5 9 0 1 5 1 0 1 5 5 01 4 7 0 1 5 9 0

    G B I C

    E q u i p m e nt

    E A S TW E S TN E TN E T

    1 5 1 0 1 5 5 01 4 7 0 1 5 9 0 1 5 1 0 1 5 5 01 4 7 0 1 5 9 0G B I C

    M U X / D E M U X - 4

    E q u i p m e nt

    E A S TW E S TN E TN E T

    T x T x

    T x

    R x

    R xR x T x

    R x

    S F P S F P

    S F P S F P

    M U X / D E M U X - 4

    M U X / D E M U X - 4 M U X / D E M U X - 4

    B u i l d i n g2

    B u i l d i n g1

    4 0 K m

  • 34

    Ring Configuration

    iMac

    iMac

    iMac

    iMac

    iMac

    iMac

    iMac

    iMac

    iMac

    Carrier Hotel Site

    Office Building B

    Office Building A

    Office Building C

    Switch

    Switch

    Switch

    FinisarOADM

    FinisarOADM

    FinisarOADM

    Finisar MUX

    Switch Switch

  • 35

    Three Node Ring Operation

    1 5 1 0 n m O A D M

    1 5 1 0 n mS F P

    1 5 1 0 n m S F P

    1 5 1 0 1 5 5 01 4 7 0 1 5 9 0 1 5 1 0 1 5 5 01 4 7 0 1 5 9 0

    S P A R E S P A R E

    G B IC

    M U X /D E M U X - 4 M U X /D E M U X - 4

    1 5 5 0 n m O A D M

    1 5 5 0 n mS F P

    1 5 5 0 n mS F P

    1 4 7 0 n mS F P

    1 4 7 0 n mS F P

    1 4 7 0 n m O A D M

    E q u ip m e n t

    E q u ip m e n t

    E q u ip m e n t

    E q u ip m e n t

    N O D E 2

    N O D E 1N O D E 3

    H E A D E N DE A S TW E S T

    E A S T

    E A S T

    E A S T W E S TW E S T

    W E S T

    N E TN E T

  • 36

    Flexible Bandwidth Allocation Rate limiting features in

    switch Allows each site to be

    allocated the bandwidth that it requires

    A higher density of sites can be supported on the ring

    Bandwidth at each each site can be increased dynamically

    Switch F

    Switch A

    Switch B

    OADM

    OADM

    OADM

    MUX/DEMUX

    Switch X Switch Z

    Switch C

    OADM

    Switch D

    OADM

    Switch E

    OADM

  • 37

    Upgrade to a DWDM network

  • 38

    DWDM Key Transceivers Specs

    DWDM APD GBIC Transceiver ITU Grid, 100Ghz, 28dB Link budget, 2.7Gbps, Low Power C Band ITU grid

    Operate at rates from 100Mbps to 2.7Gbps DFB cooled lasers Receiver - APD 28dB min, 2.5Gbps TX power -3 or + 1 dB min FTR-1631-xx xx = channel number 17- 50 Digital Diagnostics for advanced monitoring

    GBIC

  • 39

    Scalability with DWDM on CWDM

    1510nm 1530nm 1550nm 1570nm 1590nm 1610nm1490nm1470nm

    1550.92nm1550.12nm1549.32nm1548.51nm1547.72nm 1551.72nm 1552.52nm

    CWDM GRID20nm Spacing, 12nm Pass Band

    DWDM GRID0.8nm Spacing

    1553.33nm

    The CWDMfilter widthallows 8DWDMchannels togo through

  • 40

    DWDM on CWDM Node Exemple

    1 5 5 0 n m O A D M

    1 5 4 6 .9 2 1 5 4 7 .7 21 5 4 6 .1 2 1 5 4 8 .5 1

    M U X /D E M U X - 4

    C W D M O A D M N O D E

    E q u ip m e n t

    E A S TW E S T

    N E T

    1 5 4 6 .9 2 1 5 4 7 .7 21 5 4 6 .1 2 1 5 4 8 .5 1

    M U X /D E M U X - 4N E T

    D W D M M U X P a i r

    1 5 4 6 .1 2G B IC

    1 5 4 6 .9 2G B IC

    1 5 4 7 .7 2G B IC

    1 5 4 8 .5 1G B IC

    1 5 4 6 .1 2G B IC

    1 5 4 6 .9 2G B IC

    1 5 4 7 .7 2G B IC

    1 5 4 8 .5 1G B IC

  • 41

    Exemples of integration

  • 42

    Low Cost GigaBit Ethernet Metro Service

    Service based on : L3 Switches from Cisco,

    Foundry, Extreme and others

    WDM GBICs Optical Add/Drop

    Multiplexers CAT5 or MMF inside

    buildings

    Optical Add/Drop Mux, Single lambda

    Ring SMF West Cable

    Ring SMF East Cable

    Layer 3

    GBE Switch

    CAT5 riser cables for local

    service

  • 43

    MMF or Twinaxcables for local

    service

    Optical Add/Drop Mux , Single O

    Fibre ChannelSAN Fabric Switch

    Ring SMF East Cable

    Low Cost Fibre Channel Metro Service

    Service based on : L3 Switches from

    Brocade, MacData, Qlogicand others

    WDM GBICs Optical Add/Drop

    Multiplexers Twinax or MMF inside

    buildings

    Ring SMF West Cable

  • 44

    Contact :Mathieu Husson

    Laser 2000 France+33 (0)[email protected]

    www.laser2000.fr