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Optical Networking

Existing WDM equipment is designed for manual network configuration, which entails high network
maintenance cost and limits network configuration to a specific wavelength per port since the
equipment does not support wavelength switching. Also, the design poses difficulties in reconfiguring
the network when there is an increase/decrease of and change of status of lines, and poses
limitations in network configuration due to excessive reliance on physical structure. To cope with such
challenges and achieve a more effective network solution,telecom service providers are looking for
more advanced and intelligent equipment.

Requirements for a more effective network solution:

  • The newly developed more advanced equipment should be capable of minimizing the amount of manual
    work currently required for existing WDM devices, and support wavelength switching and complex
    network configuration;
  • As new types of devices have emerged that enable operators to remotely and dynamically deploy
    new wavelengths,
    the impact of a failure is higher, so the system must support multiple rings and
    mesh topologies in order to achieve a high level of survivability;
  • The system must be able to support complex connectivity requirements with a simple and unified
    network topology and support remote operation, thus increasing network stability and robustness
    and reducing operational costs;
  • Network stability and robustness must be increased and operational costs reduced; the system
    must be able to support complex connectivity requirements with a simple and unified network
    topology and support remote operation.
  • The system must be able to respond nimbly to the explosive growth of IP traffic.

In response to such requirements, ROADM (Re-configurable OADM), a more advanced version of the
existing WDM aimed at overcoming the limitations of the existing WDM devices, was introduced.
ROADM supports switching by individual wavelengths and guarantees network survivability through
configuration of ring and mesh networks. The system supports remote configuration, dramatically
lowering operational costs, and maximizing network stability by minimizing unnecessary physical
access to the optical network.
To keep up with these changing market trends and satisfy these new requirements, SNH has
developed the Firox8000R featuring 8.0Tb/s switching capability.
The system was designed to support
intercity or long-distance connection on a single device. With the Firox8000R system, telecom operators
can consolidate management of mutiple subsystems, thereby realizing simplified and cost-effective network
operations and control.

The Firox8000R is a type of ROADM (Reconfigurable Optical Add Drop Multiplexer) which is capable of
transporting SDH and Ethernet signals on the WDM physical layer. The system supports optical
transfer and optical line distribution (O-O-O) on a per-wavelength basis.

The Firox8000R can be flexibly configured for different wavelengths; it is capable of switching
wavelengths in 9 different directions (degrees). Each wavelength on each optical port can be added,
dropped, or passed through to another port. With this capability, the operator can create diverse
network configurations such as ring, point-to-point, and mesh optical topologies with simplified
network infrastructure.

The Firox8000R system is capable of transmitting 40G wavelengths (OTU3) over a long distance
section (640km). Eighty (80) wavelengths are supported, resulting in the ability to be able to
transport up to 3.2 Tb in each direction. Protection switching across the network is completed within 50 ms.

The Firox8000R provides the following operational and economic features and advantages:

  • 1) Adjust optical power in the post amplifier in order to compensate for span loss difference along the line,
        or adjust optical reception power in the pre amplifier;
  • 2) Facility loopback to check link integrity;
  • 3) Terminal loopback to verify equipment integrity
  • 4) End-to-End One-Click Provisioning;
  • 5) Automatic measurement of node-to-node distance, enabling dynamic optimization of optical
  • 6) Continuous measurement of optical power for each channel enabling fast failure detection;
  • 7) Optimization of line quality by measuring and adjusting the Optical Signal to Noise Ratio (OSNR) to
        minimize the Bit Error Rate (BER);
  • 8) Measurement of return loss to check cable quality;
  • 9) Fast and automatic response to system or network failures by re-routing wavelengths, and
        colorless technology that allows alternate wavelength selection to prevent wavelength clash during
        a re-route;
  • 10) Guaranteed network stability through redundant server configuration.

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