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.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call