Title :
Contribution of spontaneous emission to the linewidth of an injection-locked semiconductor laser
Author :
Gallion, Philippe ; Nakajima, Hiromasa ; DeBarge, G. ; Chabran, C.
Author_Institution :
Ecole Nationale Supérieure des Télécommunications, Départment Electronique et Physique, Groupe Optoélectronique et Microondes, Paris, France
Abstract :
We show that the spontaneous emission inside an injection-locked semiconductor laser does not alter the lasing field. For injection at the free-running frequency, the linewidth is only governed by the injected-field phase noise and may no longer follow the Schawlow-Townes dependence on emitted optical power.
Keywords :
laser mode locking; laser theory; semiconductor junction lasers; spectral line breadth; Schawlow-Townes dependence; emitted optical power; free-running frequency; injected-field phase noise; injection-locked semiconductor laser; linewidth; spontaneous emission;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19850443
