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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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An energy-efficient and elastic optical multiple access system based on coherent interleaved frequency division

Yuki Yoshida1, Akihiro Maruta, Kenji Ishii

  • 1Department of Electronics and Information Systems, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, Japan. yuki@comm.eng.osaka-u.ac.jp

Optics Express
|June 6, 2013
PubMed
Summary

This study introduces a novel, energy-efficient passive optical network (PON) using coherent interleaved frequency division multiple access (IFDMA). It achieves 30 Gbps uplink transmission over 30 km fiber, enabling efficient ONU access.

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Area of Science:

  • Optical Networking
  • Telecommunications Engineering
  • Signal Processing

Background:

  • Passive Optical Networks (PONs) are crucial for broadband access but face challenges in bandwidth elasticity and energy efficiency.
  • Existing multiple access schemes in PONs often require guard bands, leading to spectral inefficiency.

Purpose of the Study:

  • To propose and experimentally validate a novel bandwidth-elastic and energy-efficient PON architecture.
  • To demonstrate high-speed uplink transmission in a PON system utilizing a specific multiple access scheme.

Main Methods:

  • Implementation of a coherent interleaved frequency division multiple access (IFDMA) scheme.
  • Experimental setup for uplink transmission over a 30 km standard single-mode fiber.
  • Development of a low-complexity digital carrier synchronization technique for narrow band orthogonal subcarriers.

Main Results:

  • Successful demonstration of coherent IFDMA-PON uplink transmission up to 30 Gbps.
  • Transmission achieved over a 30 km standard single-mode fiber with two optical network units (ONUs).
  • Efficient multiple access of ONUs demonstrated using 78.1 MHz narrow band orthogonal subcarriers without guard bands.

Conclusions:

  • The proposed coherent IFDMA-PON offers a promising solution for bandwidth-elastic and energy-efficient optical access networks.
  • The low-complexity synchronization technique effectively enables dense subcarrier utilization, enhancing spectral efficiency.
  • This approach supports high-speed data transmission crucial for future telecommunication demands.