Title :
Unbroadened-spectrum chirped Modulation: effects of the chirp-inducing mechanism on the spectral broadening in LiNbO3 Modulators
Author :
Bravetti, Paolo ; Balsamo, Stefano ; Montoya, Jorge Alberto Villa ; Brouard, Raphaël ; Rouffiange, Vincent
Author_Institution :
Avanex Corp., San Donato Milanese, Italy
fDate :
3/1/2005 12:00:00 AM
Abstract :
The spectrum of a chirped optical nonreturn-to-zero data stream obtained by an external Mach-Zehnder modulator (MZM) is analyzed. We demonstrate that it is possible to induce chirp without broadening the optical spectrum by employing an MZM with optical power unbalancing in the two waveguides. For standard chirped MZMs (different electric fields on the two arms), such as z-cut LiNbO3 modulators, the broadening as a function of chirp factor is measured for comparison.
Keywords :
chirp modulation; high-speed optical techniques; lithium compounds; optical fibre communication; optical modulation; optical waveguides; spectral line broadening; LiNbO3; LiNbO3 modulators; chirp factor; chirp-inducing mechanism; chirped modulation; chirped optical data stream; external Mach-Zehnder modulator; nonreturn-to-zero data stream; optical power unbalancing; optical spectrum; optical waveguides; spectral broadening; unbroadened-spectrum; z-cut LiNbO3; Chirp modulation; Electric variables measurement; Optical interferometry; Optical mixing; Optical modulation; Optical noise; Optical receivers; Optical signal processing; Optical waveguides; Pulse measurements; Chirp parameter; Mach–Zehnder modulators (MZMs); external modulator; power spectrum; time-resolved chirp; tunable chirp;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2004.841012
