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A lithium niobate light modulator for fiber optical communications

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2 Author(s)
F. S. Chen ; Bell Laboratories, Murray Hill, N. J. ; W. W. Benson

An electrooptic intensity modulator using lithium niobate has been developed for applications in binary fiber optical digital communications at the wavelength of 1.06 µm. We have shown that many shortcomings generally associated with electro-optic modulators can be surmounted. The modulator was driven by a compact transistor amplifier, temperature dependence of the static birefringence was minimized, and the optical bias was made adjustable by a dc voltage superposed on the signal. The modulator has been operated at 70-Mb/s pulse rate and 100-percent modulation, its extinction ratio is better than 40 to 1 and the optical insertion loss is about 1 dB.

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Proceedings of the IEEE  (Volume:62 ,  Issue: 1 )