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Related Experiment Video

Updated: May 18, 2026

Quasi-light Storage for Optical Data Packets
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Quasi-light Storage for Optical Data Packets

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Gigabit NRZ, CAP and optical OFDM systems over POF links using LEDs.

J L Wei1, L Geng, D G Cunningham

  • 1Centre for Photonic Systems, Electrical Engineering Division, Department of Engineering, University of Cambridge, 9 JJ Thomson Avenue, Cambridge CB3 0FA, UK. jw748@cam.ac.uk

Optics Express
|October 6, 2012
PubMed
Summary

The new CAP-64 system significantly boosts data transmission speeds over Plastic Optical Fiber (POF) links, achieving record speeds for both bidirectional and unidirectional transmissions while maintaining low power consumption compared to other systems.

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Area of Science:

  • Optical Communications
  • Data Transmission Technologies
  • Signal Processing

Background:

  • Plastic Optical Fiber (POF) is a cost-effective medium for short-reach optical communication.
  • Existing systems like Non-Return-to-Zero (NRZ) and Quadrature Amplitude Modulation-Orthogonal Frequency Division Multiplexing (QAM-OFDM) have limitations in capacity and power efficiency over POF.
  • Forward Error Correction (FEC) enhanced links are crucial for reliable data transmission.

Purpose of the Study:

  • To compare the system capacity and power dissipation of NRZ, CAP-64, and 64-QAM-OFDM systems.
  • To evaluate performance over FEC-enhanced POF links for both unidirectional and bidirectional transmissions.
  • To identify the most efficient modulation scheme for high-speed POF communication.

Main Methods:

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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  • Simulations were conducted to model and analyze the performance of NRZ, CAP-64, and 64-QAM-OFDM systems.
  • System capacity and power dissipation were key metrics evaluated.
  • Transmissions were simulated over 50 m POF links with FEC enhancement, considering both unidirectional and bidirectional modes.

Main Results:

  • CAP-64 demonstrated superior system capacity compared to NRZ and 64-QAM-OFDM.
  • Record transmission speeds of 3.5 Gb/s (bidirectional) and 2.1 Gb/s (unidirectional) were achieved with CAP-64 over 50 m POF.
  • CAP-64 transceiver power consumption was comparable to NRZ, while 64-QAM-OFDM consumed approximately twice the power.

Conclusions:

  • CAP-64 is a highly effective modulation scheme for enhancing data rates in POF communication systems.
  • CAP-64 offers a significant advantage in system capacity and achieves higher transmission speeds than NRZ and 64-QAM-OFDM.
  • The power efficiency of CAP-64 makes it a practical choice for future high-speed POF applications.