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Signal-induced noise in fiber-optic links using directly modulated Fabry-Perot and distributed-feedback laser diodes

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5 Author(s)
Lau, K.Y. ; Dept. of Electr. Eng. & Comput. Sci., California Univ., Berkeley, CA, USA ; Gee, C.M. ; Chen, T.R. ; Bar-Chaim, N.
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A quantitative comparison has been made, both theoretically and experimentally, of signal-induced noise in high-frequency, single-mode fiber-optic links using directly modulated multimode (Fabry-Perot) and single-frequency (distributed-feedback, DFB) lasers. It is shown that the common procedure of evaluating the signal-to-noise (S/N) performance in a typical fiber-optic link by treating the various sources of noise as additive quantities that are independent of the modulation signal is inadequate. This is due to the presence of signal-induced noise, which concentrates at low frequencies, so that a casual observation might lead to the erroneous conclusion that it is of no relevance to high-frequency transmission systems. It is shown that, for Fabry-Perot lasers, signal-induced noise arising from translation of low-frequency noise to high frequencies causes significant degradation in S/N performance in transmission of 6-GHz signals over only 1 km of single-mode fiber. With DFB lasers, signal-induced noise due to interferometric phase arrow intensity conversion is present, but does not become significant even for transmission at 10 GHz up to 20 km

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Lightwave Technology, Journal of  (Volume:11 ,  Issue: 7 )