Title :
2.5-Gb/s transmission characteristics of 1.3-μm DFB lasers with external optical feedback
Author :
Grillot, F. ; Thedrez, B. ; Py, J. ; Gauthier-Lafaye, O. ; Voiriot, V. ; Lafragette, J.L.
Author_Institution :
Alcatel Res. & Innovation, Marcoussis, France
Abstract :
All-optical networks will require low-cost laser sources. In order to reduce the packaging cost and to design a module without optical isolator, the 2.5-Gb/s 300-ps/nm transmission characteristics of 1.3-μm distributed-feedback lasers is analyzed in the presence of strong external optical feedback. The penalty degradation when the laser is operating under optical feedback is discussed and its dependence with the coherence collapse onset is analyzed. Although a drastic increase of the penalty with the coherence collapse state is reported, floor-free operation is demonstrated with a return loss as high as -8 dB.
Keywords :
distributed feedback lasers; laser feedback; light coherence; light transmission; modules; optical fibre losses; optical fibre networks; optical transmitters; semiconductor device packaging; semiconductor lasers; -8 dB; 1.3 micron; 2.5 Gbit/s; DFB lasers; all-optical networks; coherence collapse onset; coherence collapse state; distributed-feedback lasers; external optical feedback; floor-free operation; laser source; module design; optical feedback; optical isolator; packaging cost; penalty degradation; return loss; transmission characteristics; All-optical networks; Costs; Degradation; Distributed feedback devices; Isolators; Laser feedback; Optical design; Optical feedback; Optical losses; Packaging;
Journal_Title :
Photonics Technology Letters, IEEE
