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Linearization of an integrated electroabsorption modulator/DBR laser with rf current modulation

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Abstract

Transmission of analog AM-VSB CATV signals over optical fibers puts stringent demands on the optical source. Source nonlinearity causes the modulated subcarriers to mix and generate intermodulation products, many of which fall within other channels. Currently, DFB lasers at 1.3 μm are the most common analog optical sources. However, alternative linear optical sources are desirable, both because of the cost of analog DFBs and because the chirp they produce is problematic. Electroabsorption (EA) modulators are used increasingly as digital sources because of their low chirp.1 They have not yet been used as analog sources because they are not linear in voltage. However, ideally, the modulator photocurrent is proportional to the amount of light absorbed, and dc measurements have demonstrated linearity in current.2,3

© 1995 Optical Society of America

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