Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 27, Issue 19, Pages 4297-4305Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2009.2023368
Keywords
Bessel functions; gratings; light sources; optical fiber dispersion; phase modulation
Funding
- National Institute of Information and Communications Technology (NICT)
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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 +/- 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.
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