Title :
Linewidth of an externally modulated laser subjected to Rayleigh backscattering from a fiber
Author :
Berglind, Eilert
Author_Institution :
Dept. of Microwave Technol., R. Inst. of Technol., Stockholm, Sweden
fDate :
4/1/1990 12:00:00 AM
Abstract :
It is found that the linewidth of a semiconductor laser that is externally phase modulated and connected to a fiber with Rayleigh backscattering is broadened. At low modulation rates the linewidth can be several orders of magnitude greater than the free-running linewidth, but it converges to the free-running linewidth at sufficiently high modulation rates. As a result, the isolation needed to attain a specific linewidth can be calculated.<>
Keywords :
Rayleigh scattering; fibre optics; optical modulation; phase modulation; semiconductor junction lasers; spectral line breadth; Rayleigh backscattering; externally modulated laser; externally phase modulated; fiber; fibre Rayleigh backscattering; free-running linewidth; high modulation rates; laser linewidth; linewidth broadening; low modulation rates; semiconductor laser; Backscatter; Fiber lasers; Fluctuations; Frequency; Laser modes; Laser noise; Laser theory; Optical reflection; Phase modulation; Semiconductor lasers;
Journal_Title :
Photonics Technology Letters, IEEE
