Directly modulated lasers (DMLs) operating at C and L band wavelengths and at bit rates of 2.5 Gb/s are attractive transmitter candidates for metropolitan area network applications because of their intrinsic low cost leveraged by the utilisation of mature laser fabrication and packaging technologies. However, one of the major drawbacks observed with many DML designs is large modulation induced chirp that, because of its interaction with the fibre chromatic dispersion, limits the regeneration free transmission distance. This problem is further exacerbated by filter concatenation, common in metropolitan area network architectures with large numbers of nodes, leading to significant narrowing of filter spectral widths.1,2 For DMLs with significant chirp such filter passband narrowing can lead to clipping of the transmitter spectrum resulting in distortion induced eye closure.

© 2002 Optical Society of America

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