Optical Switches: Making Optical Networks a Brilliant Reality

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Optical Switches Making Optical Networks a
Brilliant Reality

• SYED HOSSAINMS STUDENTOBR RA

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Definition

• Optical switches provide the key for carriers to
  both manage the new capacity dense wavelength
  division multiplexing (DWDM) provides as well as
  gain a competitive advantage in the recruitment
  and retention of new customers.
• Two types of optical switches being offered,
• optical-electrical-optical (O-E-O) switches, or
  all-optical, optical optical -optical (O-O-O)
  switches.

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Overview

• There is a debate over which type of switch to
  deploy.
• A logical evolution path to the next-generation
  network must include the deployment of
  intelligent O-E-O switches to ensure that current
  needs are met and that all-optical O-O-O switches
  are added where and when they make sense.

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Optical Network Elements

• wavelength-based infrastructure creates the
  foundation for the new-generation optical
  network.

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Two Types of Optical Switches

• The debate of O-O-O versus O-E-O has evolved into
  the question of how the two will interoperate.

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All-optical switches

• Switching photonic signals without converting
  them into electronic signals.
• All-optical, O-O-O switch is the 3D
  micro-electromechanical system (MEMS).
• 3D MEMS uses control mechanisms to tilt mirrors
  in multiple direction (3 dimensional).

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All-Optical Switches

• Without converting the signals to electrical and
  then back again.
• MEMS currently support multiple fibers, each
  carrying hundreds of wavelengths.

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Advantages Disadvantages

• Adoption of all-optical switches in a long-haul
  core optical network is a challenge.
• physical impairments such as WDM filter passband
  narrowing, component crosstalk.

• Up to 1000 x 1000 bi-directional port machines.
• A truly all-optical switch is bit-rate and
  protocol independent.
• That means unlimited scalability.
• Some argue that new technologies can deploy 40
  gigabits per second (Gbps).

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All Optical Switch

• This is especially attractive a global
  communications network node with multiple fibers,
  each carrying hundreds of wavelengths.

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Intelligent O-E-O Switches

• Available today with proven technology.
• Intelligent core optical switches converge the
  functions of transport, high bandwidth
  cross-connects and improved data-centric
  communication .

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Intelligent O-E-O Switches

• Supports a new class of high-bandwidth services.
• Larger aggregate of bandwidth by processing and
  grooming the information at a 2.5 Gbps rate.

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Optimized Optical Nodes

• Next-generation network must include the
  deployment of intelligent O-E-O switches to
  ensure that current needs are met as well as the
  addition of all-optical O-O-O switches when and
  where they make sense.

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Conclusions

• Together the intelligent O-E-O switch and the
  all-optical O-O-O switch ensure a scalable
  next-generation network that can accommodate the
  dynamic nature of bandwidth-intensive broadband
  services.

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