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Time-resolved chirp measurement of modulator-integrated DFB LD by using a fiber interferometer

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The electroabsorption modulator-integrated distributed-feedback (MI-DFB) laser diode (LD) is attractive for use in high-speed , long-haul optical-fiber transmission systems because of its low-chirp characteristic.1 Ideally, an MI-DFB laser has the same frequency chirp as a solitary electroabsorption modulator. However, due to residual reflection at the output facet, feedback light interacting with the laser causes excess chirp.2 The excess chirp increases the bit-error-rate penalty in highdispersion systems, which are sensitive to both the amount and the form of the chirp. Therefore, it is important to evaluate the time-resolved dynamic chirp of MI-DFB lasers.

© 1995 Optical Society of America

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