Abstract
Dispersion control is important in high-data-rate fiber-optic communications systems. Quadratic dispersion compensation may be achieved with dispersion-management schemes using fibers of differing dispersions.1 Linear chirped gratings, in reflection, allow a constant dispersion over bandwidths sufficient to support ultrashort pulses2 and have also been used as dispersion-compensating elements in communication systems.3 In ultrahigh-speed communication systems or in systems using ultrashort (<1 ps) pulses the third-order dispersion term (∂3β/ ∂ω3) becomes important. We have previously analyzed using a simple delay model and numerical simulations, the response of quadratically chirped gratings and have shown how in principle they could be used to provide third-order dispersion compensation.4 In this paper we present the experimental mea surement of a large cubic dispersion from chirped gratings fabricated using a new dual-scan phase-mask technique capable of fabricating a wide range of structures using simple phase masks.
© 1996 Optical Society of America
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