Title :
Transmission of directly modulated 2.5-Gb/s signals over 250-km of nondispersion-shifted fiber by using a spectral filtering method
Author :
Lee, Chang-Hee ; Lee, Sang-Soo ; Kim, Hyang Kyun ; Han, Jung-Hee
Author_Institution :
Lightwave Commun. Sect., Electron. & Telecommun. Res. Inst., Taejon, South Korea
Abstract :
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.
Keywords :
frequency modulation; intersymbol interference; laser tuning; optical fibre communication; optical fibre dispersion; optical filters; optical modulation; optical transmitters; semiconductor lasers; 2.5 Gbit/s; 250 km; chirping-induced power penalty; directly modulated Gb/s signal transmission; eye closure penalty; high extinction ratio; intensity modulation; intersymbol interference suppression; mark wavelength; modulated laser output; nondispersion-shifted fiber; nonuniform frequency modulation response; semiconductor lasers; spectral filter; spectral filtering method; transmission peak; tuned; Chirp modulation; Extinction ratio; Fiber lasers; Filtering; Filters; Intensity modulation; Laser theory; Laser tuning; Power lasers; Semiconductor lasers;
Journal_Title :
Photonics Technology Letters, IEEE
