Ee 230 optical fiber communication lecture 16
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EE 230: Optical Fiber Communication Lecture 16. Active WDM Components and Networks. From the movie Warriors of the Net. Optical Switches. Optical Switching Matrix. Switching methods. Thermo-optic Tunable filters Liquid crystal Electro-optic Liquid reflection MEMS.

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EE 230: Optical Fiber Communication Lecture 16

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Ee 230 optical fiber communication lecture 16

EE 230: Optical Fiber Communication Lecture 16

Active WDM Components and Networks

From the movie

Warriors of the Net


Optical switches

Optical Switches


Optical switching matrix

Optical Switching Matrix


Switching methods

Switching methods

  • Thermo-optic

  • Tunable filters

  • Liquid crystal

  • Electro-optic

  • Liquid reflection

  • MEMS


Tunable optical filters

Tunable Optical Filters


Agilent bubble switch

Agilent Bubble Switch


Mems technology

MEMS Technology


Wavelength converters

Wavelength Converters


Oadm illustrated

OADM Illustrated

Optical Fiber

1557.36nm

1555.75nm

OADM Sites

1535.04nm

1533.47nm


Oadm illustrated1

OADM Illustrated

Optical Fiber

1557.36nm

1555.75nm

OADM Sites

1535.04nm

1533.47nm


Oadm illustrated2

OADM Illustrated

Optical Fiber

1557.36nm

1555.75nm

OADM Sites

1535.04nm

1533.47nm


Oadm illustrated3

OADM Illustrated

Optical Fiber

1557.36nm

1555.75nm

OADM Sites

1535.04nm

1533.47nm


Oadm illustrated4

OADM Illustrated

Optical Fiber

1557.36nm

1555.75nm

OADM Sites

1535.04nm

1533.47nm


Oadm illustrated5

OADM Illustrated

Optical Fiber

1557.36nm

1555.75nm

OADM Sites

1535.04nm

1533.47nm


Opaque vs transparent oxcs

Opaque vs. Transparent OXCs

  • Opaque: every wavelength undergoes OEO conversion. S/N degradation does not accumulate, simple route choice, can change wavelengths at each hop, simple network management

  • Transparent: all-optical. Less expensive, dissipates less power, fewer interfaces, no electronics limit on bit rate. Works better in ring networks


Mems oxc in action memx co

MEMS OXC in Action (MEMX Co.)


Spectral efficiency of wdm systems

Spectral Efficiency of WDM Systems

For =100 GHz and B=10 Gb/s, =10%

For =50 GHz and B=40 Gb/s, =80%


Typical network structure

Typical Network Structure

• Composed of

WDM Transport Equipment

SONET ADD/Drop Muxes

Digital Crossconnect

• Advantages

Off the shelf technology

Full SONET Management and QOS

Flexible routing at STS-1 or below

• Disadvantages

Large

Expensive

Diversity of management systems

Difficult Provisioning

Expensive interconnect cabling

Digital Crossconnect

Transport Fiber

WDM

Transport

Equipment

SONET Add/Drop Mux

Add/Drop Channels


Types of wdm networks

Types of WDM Networks

  • Local area (LAN)

  • Metropolitan area (MAN)

  • Wide area (WAN)


Configurations of wdm networks

Configurations of WDM Networks

  • star—good for LANs

  • bus (chain)--LANs

  • ring—good for MANs and WANs

  • hub—good for WANs; collection of stars or rings


Limitations on performance n

Limitations on Performance, N

  • Wavelength stability of diode lasers

  • Nonlinear optical effects

  • Crosstalk in the demultiplexing process


Oc 48 link performance vs distance

OC-48 Link Performance vs. Distance

16 km

25 km

0 km

41 km


Oc 48 eye diagrams

OC-48 Eye Diagrams

Receiver Module Output

BERT

Laser Input

CDR Input

Laser Output

Regenerated Data (CDR output)


10gb s eye vs transmission distance

10Gb/s Eye vs. Transmission Distance

Optical Signal

Input to CDR

Optical Signal

Input to CDR

25 km

0 km

12 km

37 km

16 km

41 km


Oc 192 link testing eye diagrams throughout the system

OC-192 Link TestingEye Diagrams throughout the system

After Receiver Module

Input Signal from BERT

Input to CDR

After Laser Driver

Regenerated Data

Optical Signal from Laser


The future

The Future?

Advantages

•Reduced Cost

•More Compact

•Lower Power

•Rapid physical layer protection switching

Simplified Operation, Administration,

Management and Provisioning

•Simpler Network interface

•Fewer different management

systems

•Leverages traditional link

based management and

protection

Disadvantages

• No low level traffic grooming

• Not directly compatible with

SONET protection protocols

• Less bandwidth efficient

• No “statistical multiplexing” of

low level STS-n data streams


Design objective 120 gb s optical wdm cross connect switch

Design Objective120 Gb/s Optical WDM Cross Connect Switch

WDM with Electronic Switching Technology

  • Cross Connect Configuration

    • 3x3 fiber switch

    • 4 channels/fiber

    • 10 Gb/s/channel

  • Electronic Switch Core

    • OC192/OC48 compatible

  • Optical MUX/DEMUX

    • ITU WDM channels

  • Key Technology

    • Rockwell GaAs HBT

    • Ortel DFB Laser/PIN

Advantages of an Electronic Core

  • Data regeneration/retiming

  • Wavelength translation

  • Low crosstalk

  • OC192/OC48 compatible

  • Realizable with current state-of-the-art production technology

  • Potential for additional processing of input signal (smart switch)


West system demonstration configuration overview

WEST System DemonstrationConfiguration Overview

  • Configured as an Add/Drop node

  • 4 Channels of Add/Drop

  • 8 Transmission Channels

  • Optical Monitoring

  • Eye diagram monitoring

  • Clock monitoring for acquisition

  • demonstration


12x12 vxi switch module feature highlights

12x12 VXI Switch ModuleFeature Highlights

  • Switch Module Features:

    • 120 Gb/s data throughput

    • Twelve 10 Gb/s channels

    • VXI Management and Control

  • High Speed Package Features:

    • Clean high speed interface

    • High Isolation

    • Thermal management

  • Switch Chip Highlights:

    • Suitable for larger switching fabrics

    • GaAs/AlGaAs HBT

    • Low crosstalk & jitter generation

    • Die size: 4.8 x 5.1 mm2

    • 4600 transistors

    • Pdiss: 7.4 W

10Gb/s


Wdm network design considerations

WDM Network Design Considerations

  • transparent or opaque?

  • power level? (high better for receivers, low better for transmitters and NLO)

  • branching configuration?

  • channel spacing? (small better for capacity, large better for crosstalk)


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