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

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4 Author(s)
Takashi Yamamoto ; NTT Access Network Service Syst. Labs., Nippon Telegraph & Telephone Corp., Tsukuba, Japan ; Tetsuro Komukai ; Kazunori Suzuki ; Atsushi Takada

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 ??/4 and a group velocity dispersion of ??1/(4??fm 2), where fm 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.

Published in:

Journal of Lightwave Technology  (Volume:27 ,  Issue: 19 )