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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 27, Iss. 19 — Oct. 1, 2009
  • pp: 4297–4305

Multicarrier Light Source With Flattened Spectrum Using Phase Modulators and Dispersion Medium

Takashi Yamamoto, Tetsuro Komukai, Kazunori Suzuki, and Atsushi Takada

Journal of Lightwave Technology, Vol. 27, Issue 19, pp. 4297-4305 (2009)

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This paper describes a phase-locked multicarrier light source that employs a continuous wave (CW) light source, two phase modulators, and a dispersion medium. A sinusoidal phase modulation (PM) with a modulation index of $\pi/4$ and a group velocity dispersion of ${\pm}1/(4\pi f_{m}^{2})$, where $f_{m}$ is the modulation frequency, are applied to a CW light followed by a large sinusoidal PM. This configuration provides a multicarrier light with a flattened optical power spectrum for any modulation index of the second PM. By adopting a chirped fiber Bragg grating (FBG) as a dispersion medium instead of a long normal dispersion fiber, we can increase the stability of the optical output spectrum and reduce the size of the multicarrier light generator. We have built a prototype with this configuration that generates a 61-carrier light with a 25 GHz interval and a power deviation of less than 8 dB.

© 2009 IEEE

Takashi Yamamoto, Tetsuro Komukai, Kazunori Suzuki, and Atsushi Takada, "Multicarrier Light Source With Flattened Spectrum Using Phase Modulators and Dispersion Medium," J. Lightwave Technol. 27, 4297-4305 (2009)

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