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Transmission of directly modulated 2.5-Gb/s signals over 250-km of nondispersion-shifted fiber by using a spectral filtering method

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4 Author(s)
Chang-Hee Lee ; Lightwave Commun. Sect., Electron. & Telecommun. Res. Inst., Taejon, South Korea ; Sang-Soo Lee ; Hyang Kyun Kim ; Jung-Hee Han

We demonstrate 250-km nondispersion-shifted fiber transmission of directly modulated 2.5-Gb/s signals. The chirping-induced power penalty is reduced by using a spectral filter whose transmission peak is tuned to "mark" wavelength of the modulated laser output. A well-known intensity modulation with a sufficiently high extinction ratio is used to suppress the intersymbol interference induced by nonuniform frequency modulation response of semiconductor lasers. The observed results are explained theoretically by using eye closure penalty.

Published in:

Photonics Technology Letters, IEEE  (Volume:8 ,  Issue: 12 )

Date of Publication:

Dec. 1996

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