Optical Multichannel Signal Regeneration

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First preferred embodiment layout for a format insensitive 2R regenerationFirst preferred embodiment layout for a format insensitive 3R regeneration
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Researchers
Guifang Li, Ph.D.
Yuhua Li
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John Miner
Assistant Director 407.882.1136
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All optical regeneration

US Patent 7,224,863 B1

Method and apparatus for efficient optical regeneration

UCF scientists have developed a more efficient all-optical regeneration system that addresses the limitations of pre-existing inventions. It can process multiple channel communications and is capable of removing the noise from both 0 and 1 bits.

Technical Details

The growing demand for high capacity fiber optic communication systems has led to an increase in the use of multiple channel transmissions with higher line rates in dense wavelength division multiplexing (DWDM). Such systems are plagued with propagation problems such as amplified spontaneous emission, four-wave mixing, cross-phase modulation and Ramen scattering. In addition, optical signals become degenerated when transmitted over long distances. Thus, for reliable optical communication, propagation distance is kept short. Otherwise, optical regeneration is required to restore the optical signal. These issues are accentuated in all- optical networks, with signals that must pass through variable distances and unpredictable switching nodes. Currently, a variety of technologies have been suggested for all-optical regeneration. In general, conventional optoelectronic regenerators are expensive and their bandwidth is limited. Other techniques can only handle one channel at a time or remove noise from either 0 or 1 bits, but not both.

Benefits

  • Significantly improves output signal quality and extinction ratio
  • Provides noise reduction for both 1 and 0 bits
  • Facilitates both 2R (reamplification and reshaping) and 3R (reamplification, reshaping and retiming) regeneration
  • Performs faster than conventional systems

Applications

  • Long-haul, fiber optic communication systems
  • Front-end of the optical receiver, to minimize the error rate by improving the signal extinction ratio