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Study of reduction of nonlinear chirp distortion directly modulated semiconductor lasers by using pulse shaping | ||
| Journal of Engineering and Sustainable Development | ||
| Article 1, Volume 13, Issue 3, 2009, Pages 158-165 | ||
| Author | ||
| Mohammed Adnan Mahde | ||
| Abstract | ||
| A modulation of the device current leads to laser-power modulation and is useful for transmitting information as a sequence of optical pulses .However , modulation of the current also affects the optical frequency which emphasize that carriers influence the optical phase . The center frequency of the out put laser shifts by an amount during modulation . The phenomenon of the dynamic shift of the laser frequency is referred to as frequency chirping or wavelength chirping . The chirp is directly proportional to the line-width enhancement factor and has its origin in the carrier induced index change that accompanies any gain change in semiconductor laser . This chirp may be reduced by a suitable shaping of the injection current . | ||
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