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Comments, with reply, on `Passive equalization of semiconductor diode laser frequency modulation' by S.B. Alexander et al

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2 Author(s)
Dilwali, S. ; Dept. of Electr. Eng., Indian Inst. of Technol., Delhi, India ; Pandian, G.S.

Some flaws in a recent article by S.B. Alexander et al. (ibid., vol.7, no.1, p.11-23, Jan. 1989) on the theory of equalization of FM response of a laser diode using passive filters are noted. An error has occurred as a result of assuming a constant C as a positive instead of negative. When C is negative and large, the equalization network cannot be realized with passive networks. Also the simulated time waveform shown in the article for the optical frequency of an equalized laser does not show some spikes which are expected theoretically. The spikes occur as a result of an imperfect equalization provided by the proposed passive filters that were realized assuming C as positive. In replying the original author feels that the comments and observations result simply from attempting to extend the simple FM transfer-function model far beyond its limits while trying to introduce unnecessary theoretical rigor

Published in:

Lightwave Technology, Journal of  (Volume:10 ,  Issue: 7 )

Date of Publication:

Jul 1992

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