Title :
4-Gb/s heterodyne transmission experiments using ASK, FSK and DPSK modulation
Author :
Gnauck, A.H. ; Reichmann, K.C. ; Kahn, J.M. ; Korotky, S.K. ; Veselka, J.J. ; Koch, T.L.
Author_Institution :
AT&T Bell Lab., Holmdel, NJ, USA
Abstract :
An experimental heterodyne lightwave transmission system operating at 4 Gb/s is described. The optical sources were 1.5- mu m-wavelength DFB (distributed feedback) and DBR (distributed Bragg reflector) semiconductor lasers. ASK, FSK, and DPSK modulation formats were investigated; baseline receiver sensitivities of 175, 191, and 209 photons/bit, respectively, were achieved. Transmission experiments through up to 160 km of conventional single-mode fiber and up to 175 km of dispersion-shifted fiber are also reported.<>
Keywords :
amplitude modulation; demodulation; distributed Bragg reflector lasers; distributed feedback lasers; frequency modulation; optical communication equipment; optical links; optical modulation; 1.5 micron; 160 km; 175 km; 4 Gbit/s; ASK modulation; DBR lasers; DFB lasers; DPSK modulation; FSK modulation; baseline receiver sensitivities; dispersion-shifted fiber; distributed Bragg reflector; distributed feedback; heterodyne transmission experiments; lightwave transmission system; optical sources; semiconductor lasers; single-mode fiber; Amplitude shift keying; Differential quadrature phase shift keying; Distributed Bragg reflectors; Distributed feedback devices; Frequency shift keying; Optical feedback; Optical mixing; Optical modulation; Optical receivers; Optical sensors;
Journal_Title :
Photonics Technology Letters, IEEE
