3 June 2005 Phase correlation in self-pulsating distributed Bragg reflector laser
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All-optical regeneration at 40 Gbit/s and beyond appears to be a crucial element for future transparent networks. One solution to achieve the regeneration is an all-optical clock recovery element combined with a Mach-Zehnder interferometer. Among the different approaches investigated so far, a scheme based on a single self-pulsating distributed Bragg reflector laser is of particular interest from practical and cost viewpoints. In this structure at least two longitudinal modes beat together, generating power oscillation at 40-GHz even though the laser is DC-biased. The 40-GHz signal frequency is fixed by the free spectral range of the cavity, and in the case of the self-pulsation, it has been demonstrated that its linewidth is smaller than the sum of the linewidth of the lasing modes. It is believed that the signal benefits from the phase correlation of the optical modes through the interband four-wave mixing (FWM) non-linearity. The FWM results as a modulation of the carrier population, leading to a non-linear gain and refractive index modulation, affecting both the amplitude and the phase of the cavity modes. Based on a four-wave mixing formalism a theoretical model has been developed and it corroborates the experimental linewidth measurement.
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P. Landais, J. Renaudier, G.-H. Duan, "Phase correlation in self-pulsating distributed Bragg reflector laser", Proc. SPIE 5825, Opto-Ireland 2005: Optoelectronics, Photonic Devices, and Optical Networks, (3 June 2005); doi: 10.1117/12.605065; https://doi.org/10.1117/12.605065

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