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Analysis of Dispersion Penalty with Chirp Gratings in 10 Gb/s Systems

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Abstract

Dispersion is a significant factor limiting the maximum bit rate-distance in future high speed, long distance optical fiber systems. It causes significant signal degradation when combined with chirping introduced by the semiconductor laser. The signal degradation is caused in terms spreading of the optical pulses. The resulting intersymbol interference can cause a significant performance degradation and since degradation increases with bit rate and length of optical fiber, it results in lower repeater spacings. With the increased use of doped optical amplifiers to compensate for the loss, a device which can combat the spreading of the optical pulses will result in a higher bit rate and hence longer repeater spacing. A structure which is capable of providing dispersion characteristics opposite to that of the fiber could serve as an useful optical pulse equalizer. For example, a single mode fiber with strong chromatic dispersion characteristics at the operating wavelength but opposite in sign to that of the transmitting fiber can be used. A number of optical domain techniques have been used to compensate the dispersion. These include reflective Fabry-Perot, cascaded mac Zehnder interferometers, mid-system phase conjugation, waveguide grating filters, chirped gratings in the fiber. There are recent experimental system demonstrations of dispersion compensation with bragg In-fiber gratings using external modulation with fixed chirp[1,2]. Recently [3] a 2 cm long grating dispersion compensation has been simulated for electroabsorption modulator system at 10 Gb/s.

© 1995 Optical Society of America

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