Small-signal microwave performance of gain-coupled DFB laser array elements at 1.3 um

Ezio Berolo; J. Bosomworth; Heng Hua; Karen A. Vineberg; G. P. Li; Hanh Lu; Toshi Makino; Frank R. Shepherd

doi:10.1117/12.265376

30 January 1997 Small-signal microwave performance of gain-coupled DFB laser array elements at 1.3 μm

Ezio Berolo, J. Bosomworth, Heng Hua, Karen A. Vineberg, G. P. Li, Hanh Lu, Toshi Makino, Frank R. Shepherd

Proceedings Volume 2918, Emerging Components and Technologies for All-Optical Photonic Systems II; (1997) https://doi.org/10.1117/12.265376
Event: Photonics East '96, 1996, Boston, MA, United States

Abstract

The small-signal microwave performance of 1.3 micrometer gain-coupled DFB lasers has been measured as a function of device parameters such as current and ridge width by treating the laser as a two port device. The s-parameters were measured over a frequency range from 0.5 GHz to 8 GHz. The simulation software LIBRA was used with S₁₁ return loss measurements to extract equivalent circuit parameters according to Kan and Lau's laser model. Results demonstrate that the parameters describing the input impedance of the laser undergo a discontinuity at the lasing threshold current, I_th. The measured optical intensity modulation (IM) response, (S₂₁), was used to study the behavior of the relaxation oscillation frequency f_r as a function of laser bias current. It has been demonstrated that at high laser bias current I_laser, f_r is independent of laser bias current (I_laser). We have also used the equivalent circuit parameters obtained from the S₁₁ data to predict values for f_r based on equations derived. These were then compared to the f_r values obtained from S₂₁ measurements.

Citation Download Citation

Ezio Berolo, J. Bosomworth, Heng Hua, Karen A. Vineberg, G. P. Li, Hanh Lu, Toshi Makino, and Frank R. Shepherd "Small-signal microwave performance of gain-coupled DFB laser array elements at 1.3 μm", Proc. SPIE 2918, Emerging Components and Technologies for All-Optical Photonic Systems II, (30 January 1997); https://doi.org/10.1117/12.265376

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