Title :
Residual chirp in integrated-optic modulators
Author :
Djupsjöbacka, Anders
Author_Institution :
Ericsson Telecom AB, Stockholm, Sweden
Abstract :
The authors have analyzed and measured the dispersion effects of residual chirp arising from asymmetry in field overlap in Mach-Zehnder structures. A clear influence of chirp was seen at 7 Gb/s and a propagation length of 75-km nondispersion shifted fiber at lambda =1.55 mu m. It is shown that a MZ-modulator with field overlap in one arm only and operated in the blue-shift mode is the best choice for single coplanar stripline (CPS) electrode MZ-modulators in this case. Calculations have shown good agreement with measured results. This indicates that a simple model for fiber mode propagation have shown good agreement with measured results. This can be used together with a FFT-algorithm for calculating the effect of residual chirp from external modulators in multigigabit dispersive fiber-optic systems.<>
Keywords :
electro-optical devices; integrated optics; optical modulation; 1.55 micron; 7 Gbit/s; 75 km; FFT-algorithm; LiNbO/sub 3/; Mach-Zehnder structures; blue-shift mode; dispersion effects; external modulators; fiber mode propagation; field overlap asymmetry; integrated-optic modulators; multigigabit dispersive fiber-optic systems; nondispersion shifted fiber; propagation length; residual chirp; single coplanar stripline electrode modulators; Chirp modulation; Electrodes; Isolators; Optical filters; Optical modulation; Optical receivers; Pulse measurements; Switches; Transfer functions; Voltage;
Journal_Title :
Photonics Technology Letters, IEEE
