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10- to 80-Gb/s, Highly Extinctive Electrooptic Pulse Pattern Generation

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Abstract

Practical ultrafast signal sources are urgently required for testing ultrafast photonic and electronic devices [1]-[4]. Pulse-rate tunability and synchronization to electric clocks exciting the device under measurement are substantial requirements for characterization use. Sinusoidal electrooptic phase modulation of around π radian and linear chirp compensation makes possible pulse compression of 0.1 or less from a CW laser light [5], By quadruplexing the bit rates, we have achieved 10- to 72-Gb/s tunability using a 18-GHz bandwidth LiNbO3 phase modulator and a dispersion shifted fiber [2]. The problem is the nonuniform, insufficient extinction ratio varying from 13.5 to 20 dB with the bit rate [6], which seriously degrades the pulse eye opening. This variation is caused by the residual wings caused by nonlinear chirp components generated by sinusoidal phase modulation.

© 1996 Optical Society of America

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