Title :
Predistortion of electroabsorption modulators for analog CATV systems at 1.55 μm
Author :
Wilson, Gordon C. ; Wood, Thomas H. ; Gans, M. ; Zyskind, J.L. ; Sulhoff, J.W. ; Johnson, J.E. ; Tanbun-Ek, T. ; Morton, Paul A.
Author_Institution :
Bell Labs., Lucent Technol., Holmdel, NJ, USA
fDate :
9/1/1997 12:00:00 AM
Abstract :
A predistortion circuit with adjustable amounts of third- and fifth-order predistortion is studied both theoretically and experimentally. The circuit is used to cancel the third- and fifth-order intermodulation distortion of a 1.55-μm integrated electroabsorption modulator/DFB laser. The CSO obtained is -61 dBc and the CTB is reduced 22.6 dB to -65 dBc. This performance is maintained after fiber amplification and propagation through 13 km of nondispersion shifted fiber due to the modulator´s low chirp. Dithering of the DFB laser´s injection current is employed to increase the stimulated Brillouin scattering (SBS) threshold to +13.4 dBm
Keywords :
cable television; electro-optical modulation; electroabsorption; intermodulation distortion; optical fibre networks; stimulated Brillouin scattering; 1.55 mum; 13 km; CSO; CTB; SBS threshold; analog CATV systems; electroabsorption modulators; fifth-order intermodulation distortion; fifth-order predistortion; injection current; integrated electroabsorption modulator/DFB laser; low chirp; nondispersion shifted fiber; predistortion circuit; stimulated Brillouin scattering; third-order intermodulation distortion; third-order predistortion; Absorption; Brillouin scattering; Chirp modulation; Circuits; Erbium-doped fiber lasers; Gallium nitride; Laser noise; Optical fiber cables; Optical fiber networks; Predistortion;
Journal_Title :
Lightwave Technology, Journal of
