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Gigahertz Linearity Under Large Signal Intensity Modulation and Noise Characteristics of DFB-DC-PBH Lasers

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Abstract

Analog optical transmission requires high linearity of the optical sources. Measurements of nonlinear distortions of various lasers modulated at tens to hundreds of MHz(1–4) and BH GaAlAs lasers modulated at microwave frequencies(5–6) have been carried out. However, microwave analog applications are presently restricted to 0.85 um region owing to the lack of suitable laser sources. Recently, DFB lasers have generated significant interest because of their single-longitudinal-mode capability even under high frequency modulation. In this paper, we present new results for the linearity and noise performances of InGaAsP/lnP DFB double-channel planar buried-heterostructure (DFB-DC-PBH) lasers under gigahertz intensity modulation. It is found that these lasers show extremely good linearity and low noise when biased reasonably above threshold, providing access to long wavelength regions where attenuation and dispersion are Sow. The third order intermodulafcjon products (2f1−f2, 2f2−f1) which are particularly detrimental for multicarrier microwave FDM systems, and the intrinsic relative intensity noise which is crucial to system S/N, are comparable to the best results reported today from a BH laser fabricated on a semi-insulating (SI) substrate(6).

© 1985 Optical Society of America

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