Abstract

Integrated electroabsorption modulated lasers (EMLs) are designed for use in high bit-rate 1550-nm fiber-optic communication systems in which the dispersion penalty incurred using directly modulated distributed feedback (DFB) lasers is judged unacceptably high. A critical system parameter is the total frequency chirp exhibited by the EML source under digital modulation, typically at 2.5 or 10 GBit/s. Frequency chirp in an EML arises from the electro-optic effect in the modulator, electrical cross talk between modulator and laser sections and from reflected optical power, which re-enters and perturbs the DFB laser section after undergoing modulation.

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