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Updated: May 25, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

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Published on: March 20, 2017

Real-time 93.8-Gb/s polarization-multiplexed OFDM transmitter with 1024-point IFFT.

Beril Inan1, Susmita Adhikari, Ozgur Karakaya

  • 1Institute of Communications Engineering, Technische Universität München, Arcisstrasse 21 D-80333, Munich, Germany. beril.inan@tum.de

Optics Express
|January 26, 2012
PubMed
Summary
This summary is machine-generated.

We developed a 93.8-Gb/s real-time optical Orthogonal Frequency Division Multiplexing (OFDM) transmitter, achieving the largest Inverse Fast Fourier Transform (IFFT) size to date. This breakthrough enables higher data rates in optical communication systems.

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Quasi-light Storage for Optical Data Packets
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Last Updated: May 25, 2026

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07:45

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Published on: February 6, 2014

Area of Science:

  • Optical Communications
  • Digital Signal Processing
  • Integrated Circuit Design

Background:

  • Orthogonal Frequency Division Multiplexing (OFDM) is a key technology for high-speed optical communication.
  • Implementing large Inverse Fast Fourier Transform (IFFT) sizes in real-time optical OFDM transmitters is constrained by Field-Programmable Gate Array (FPGA) resources.
  • Achieving higher data rates necessitates advancements in modulation schemes and hardware implementation.

Purpose of the Study:

  • To demonstrate a real-time optical OFDM transmitter with a record-breaking 1024-point IFFT size.
  • To investigate the performance implications of implementing a large IFFT size on FPGA.
  • To evaluate the data transmission capabilities using polarization-multiplexing and 4-Quadrature Amplitude Modulation (4-QAM).

Main Methods:

  • Developed a real-time optical OFDM transmitter utilizing polarization-multiplexing and 4-QAM.
  • Implemented a 1024-point IFFT, the largest known for OFDM, on FPGA hardware.
  • Conducted optical back-to-back measurements to assess performance metrics like Bit Error Rate (BER) and Optical Signal-to-Noise Ratio (OSNR).

Main Results:

  • Successfully demonstrated a 93.8-Gb/s real-time optical OFDM transmission.
  • The implementation penalty due to FPGA resource limitations reached up to 2 dB for a BER of 7x10⁻⁴.
  • An optical back-to-back measurement indicated a required OSNR of 26.5 dB for a BER of 10⁻³.

Conclusions:

  • The 1024-point IFFT implementation represents a significant advancement in real-time optical OFDM transmitters.
  • FPGA resource constraints present challenges but do not preclude the implementation of high-order IFFTs.
  • The demonstrated system achieves high data rates, paving the way for future optical network enhancements.