10G CWDM Conversion Technology

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10G CWDM Conversion Technology

– Simplifying Today’s Challenges

Simplifying Today s Challenges

By Transition Networks

Curt Carlson

Product Manager

c rtc@transition com

[email protected]

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Agenda

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• WDM Technology Overview

• What are the features/benefits for 10G CWDM

• Real-World Use Case/Examples

• CWDM vs. DWDM

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WDM Defined

• Wavelength Division Multiplexing . . .

. . . a technology which multiplexes multiple optical carrier signals on a single optical fiber by using different wavelengths (colors) of light to carry each individual signal

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Why WDM Technology

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• Traditionally

E h fib ti i t t d f fib – Each fiber connection requires two strands of fiber

• one for TX and one for RX

• Fully Consumed

Fully Consumed

– What do you do when all of your installed fiber is used up and you need to add more links?

• Install more fiber? • Lease more fiber?

• Deploy WDM TechnologyDeploy WDM Technology

• Fiber Exhaustion

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WDM Analogy

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Highway analogy for WDM: Highway analogy for WDM:

If we increase the number of lanes on a highway, we can increase the volume of traffic. Each lane has the same capacity and speed limit as before, but our capacity is increased by the factor equal to the number of lanes

number of lanes

Alternatives to increase capacityp y

• Building a new highway = installing more fiber

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WDM Principle – Multiplexing/Demultiplexing

λ1 λ₁ λ2 λ2 tiplexer λ1, λ2, λ3, λ4 2 λ ltiplexer λ3 Mul t λ3 Demu λ3 λ λ4 λ4

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Support for WDM

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• A wide variety of communication environments

support WDM technology

Fast Ethernet OC 3/FDDI/ATM – Fast Ethernet - OC-3/FDDI/ATM – 10/100 - RS232

– Gigabit EthernetGigabit Ethernet - RS422/485RS422/485

– 10/100/1000 - High Speed Serial – Ethernet NIDs - NICs

– T1/E1 - SFPs

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WDM Types

3 Types WDM Technology

Type Channels Channel spacing Remarks WWDM 2 100 nm or Typically 1310nm and 1550nm WWDM 2 100 nm or more - Typically 1310nm and 1550nm - Inexpensive

- Can be done by transceiver

CWDM 4 - 16 20nm - Higher channel counts than WWDM

CWDM 4 16 20nm Higher channel counts than WWDM

- Lower cost than DWDM

- Passive optical components – Mux/DeMux

DWDM 8 - 160 0.8 or 1.6 - Max 16 ch. for passive OC

nm _{- Active solutions add management and}

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WWDM Transceiver

• Wideband WDM can sometimes be referred to as WWDM • Typically 2 wavelengths – 1310nm and 1490/1550nm

 Analogy: Two lane country road – one lane in each direction • Bi-directionally, over one strand of fiber

• Offers potential to double the fiber capacity of existing network • Available in SFP modules and in fixed optics

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WWDM Common Application

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• Moving from duplex fiber to simplex fiber

– Doubling current fiber plantDoubling current fiber plant

• Media Conversion

– Fiber ports use a simplex optic

• Single fiber, single strand, or simplex fiber

• Photo below show single SC connector

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CWDM – Multiplexer/Demultiplexer

Type Channels Channel spacing Remarks WWDM 2 100 nm T picall 1310nm and 1550nm WWDM 2 100 nm or more - Typically 1310nm and 1550nm - Inexpensive

CWDM 4 - 16 20nm - Higher channel counts than WWDM

- Lower cost than DWDM

- Passive optical components – Mux/DeMux

DWDM 8 - 160 0.8 or 1.6 - Max 16 ch. for passive OC nm

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- Active solutions add management and

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CWDM – Multiplexer/Demultiplexer

• Coarse WDM

• Typically 4, 8, or 16 wavelengths – encompassing 1310nm to 1610nm  Analogy: Multi-lane divided highway

• Typically used uni directionally • Typically used uni-directionally

• Single Strand for Transmit and a single strand for receive

WDM WDM

• Or as an optical add/drop mux (OADM)

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CWDM – Multiplexer/Demultiplexer

• Typical 1550nm window wavelengths = 1470nm to 1610nm in 20nm increments

increments

• Typical 1310nm window wavelengths = 1270nm to 1410nm in 20nm increments

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DWDM – Multiplexer/Demultiplexer

Type Channels Channel Remarks Type Channels Channel

spacing Remarks WDM 2 100 nm or more - Typically 1310nm and 1550nm - InexpensiveInexpensive

CWDM 4 - 16 20nm - Higher channel counts than WWDM - Lower cost than DWDM

- Passive optical components – Mu/DeMux

DWDM 8 - 160 0.8 or 1.6 nm

- Max 16 ch. for passive OC

- Active solutions add management and

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DWDM – Multiplexer/Demultiplexer

• Dense WDM

• Typically 8 or more wavelengths – centered around 1550nm

• Typically used uni-directionally or as an optical add/drop mux (OADM) • Adds a Reprogrammable Optical Add/Drop (ROADM)

• Channel spacing typically 0.8nm (100GHz) or 1.6nm (200GHz)p g yp y ( ) ( )

• 160 channels possible on active systems (max. 40 channels passive) using 0.2nm (25GHz) channel spacing( ) p g

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F

/B

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10G CWDM

Features/Benefits for 10G CWDM

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10G CWDM

• There are many influences for the growth of 10G and it’s expansion into the Enterprise Industrial Environments expansion into the Enterprise, Industrial Environments, and Service Provider Networks

1. 10G hardware has become more economical

2. Business Ethernet and Ethernet Mobile Backhaul has evolved with a need for higher capacity

3. CWDM Multiplexers are passive and agnostic of protocol or speed

4. Increased bandwidth requirements for Cloud Networkingq g 5. Increased device connections over fiber pairs

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CWDM & DWDM Mux Technology

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From Line RX port

To 1510nm RX port

To 1550nm RX port To 1530nm RX port

• Completely passive WDM devices use thin film filters to Mux

To 1570nm RX port

and Demux the wavelengths

• Requires no external power supplies • Compatible with all single mode fiber

• Compatible with all WDM wavelength based electronics

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CWDM Technology

20nm spacing 1470nm 1490nm 1510nm 1530nm 1550nm 1570nm 1590nm 1610nm CWDM MUX 0 spac g 1470nm 1610nm 10G Connections 10G Connections 10G Connections Any Protocol Any Protocol Any Protocol

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Wavelength Converting

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• Multiple protocols can be transmitted over a single duplex fiber link by

over a single duplex fiber link by combining fiber outputs of several converters with passive CWDM

/d

mux/demux

 SONET, ATM, Fast Ethernet, Gigabit Ethernet, T1/E1, DS3/E3, etc…/ , / ,

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Wavelength Converting Transponders

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• Referred to as Transponders

• Performs fiber to fiber (wavelength to wavelength) conversion( g g ) • Provides means for a general wave length (white light) to be

converted to a CWDM specific wave length

– Based on the SFP modules usedBased on the SFP modules used

• Manufacturers design product based on supported data rate

– 100M to 1Gig

– 1G to 10G

– Sometimes protocol independent

• Be aware, some devices may only reamplfy the signal

Others reamplfy reshape and retime (3R’s) – Others reamplfy, reshape and retime (3R’s)

• Transponders are also used when switches do not support higher power requirement of CWDM SFP modules

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CWDM Technology

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• OADM – Optical Add/Drop Multiplexer

– All the light paths that directly pass an OADM are termed cut-throughAll the light paths that directly pass an OADM are termed cut through light paths, while those that are added or dropped at the OADM node are termed added/dropped light paths

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CWDM Technology

1570 Drop 1590 Drop

OADM

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Real World Examples

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CWDM Common Topologies

• Point-to-Point 8 Ch l 8 Ch l 8 Channel CWDM Box 8 Channel CWDM Box Mux Demux Mux Demux

• Alleviate fiber congestion:

 Reducing backbone fiber used by a factor of 4, 8 or 16

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CWDM Common Topologies

• Ring

Building A

Mux

Demux Demux Mux

Demux Mux Mux Mux Demux 8 Channel CWDM Boxes Mux Demux Mux Demux (2) at each location Mux Demux Mux Demux Building D Building B Building C

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CWDM

DWDM

CWDM vs. DWDM

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CWDM versus DWDM

Parameter CWDM DWDM

Inter channel spacing 20nm As low as 0.2nm

Number of channels Up to 16 More than 160

Communication Range 40-80km - 200km

Optics Fixed Laser Tunable Laser

Cost Lower Higher

Market Metro, Access,

Large enterprise

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xWDM Summary

• Increase fiber capacity without pulling more fiber • Multiple protocols all running on same fiber pair

• Passive Layer 1 Solution. Customer’s traffic remains untouched • xWDM optics available as fixed or pluggable (SFP, XFP, etc.)

• Convert existing wideband optics to narrowband xWDM colors g p with use of “optical line converters” or “transponders”

• Solution can be used either Point to Point or as an Add/Drop Multiplexer (OADM)

• CWDM 10G offers many benefits to service providers that need to better utilize the existing fiber infrastructure.

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10G CWDM Conversion Technology