Title :
Suppression of external cavity modes in DFB lasers with a high endurance against optical feedback
Author :
Kurosaki, Takeshi ; Hirono, Takuo ; Fukuda, Mitsuo
Author_Institution :
NTT Opto-Electron. Labs., Kanagawa, Japan
Abstract :
This paper clarifies that the external cavity modes deform optical output response in the DFB lasers by enhancing the relaxation oscillation under NRZ modulation. It is shown that a DFB laser with an asymmetric structure in reflectivity of facets and in position of a /spl lambda//4 phase shift can suppress the influence of the external cavity modes.<>
Keywords :
distributed feedback lasers; laser cavity resonators; laser modes; optical modulation; oscillations; reflectivity; semiconductor lasers; /spl lambda//4 phase shift; DFB lasers; NRZ modulation; asymmetric structure; external cavity modes; high endurance; optical feedback; optical output response; reflectivity; relaxation oscillation; Coherence; Fiber lasers; Laser feedback; Laser modes; Laser noise; Noise level; Optical feedback; Optical modulation; Optical noise; Power lasers;
Journal_Title :
Photonics Technology Letters, IEEE
