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Related Experiment Video

Updated: May 25, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Dual-carrier IQ modulator with a complementary frequency shifter.

Hiroshi Yamazaki1, Takashi Saida, Takashi Goh

  • 1NTT Photonics Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa, 243-0198 Japan. yamazaki.hiroshi@lab.ntt.co.jp

Optics Express
|January 26, 2012
PubMed
Summary

We developed a novel dual-carrier IQ modulator using a complementary frequency shifter. This device successfully generated a 100 Gb/s/pol dual-carrier OFDM-QPSK signal for advanced optical communications.

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Area of Science:

  • Photonics and Optical Communications
  • Integrated Optics
  • Signal Processing

Background:

  • Advanced optical modulation techniques are crucial for increasing data transmission capacity.
  • Generating multiple optical subcarriers efficiently is a key challenge in high-speed optical systems.
  • Existing methods for subcarrier generation often require complex optical filtering.

Purpose of the Study:

  • To develop a novel dual-carrier IQ modulator for high-capacity optical communication systems.
  • To integrate a complementary frequency shifter (CFS) with IQ modulators for efficient subcarrier generation.
  • To demonstrate the performance of the fabricated modulator in generating a high-speed dual-carrier signal.

Main Methods:

  • Devised a dual-carrier IQ modulator incorporating a novel complementary frequency shifter (CFS).
  • Fabricated the modulator using a hybrid approach combining silica planar lightwave circuits and a LiNbO(3) phase-modulator array.
  • Demonstrated frequency-spacing-tunable operation of the CFS.

Main Results:

  • The CFS successfully generated two optical subcarriers from a single light source without optical demultiplexing filters.
  • The hybrid modulator exhibited frequency-spacing-tunable operation.
  • A 100 Gb/s/pol dual-carrier OFDM-QPSK signal was successfully generated using the developed modulator.

Conclusions:

  • The novel dual-carrier IQ modulator with an integrated CFS offers an efficient method for generating optical subcarriers.
  • The hybrid fabrication approach is viable for creating advanced optical modulators.
  • The demonstrated signal generation capability paves the way for higher data rates in optical networks.