Title :
Comparison of DFB laser linewidth measurement techniques results from COST 215 round robin
Author :
van Deventer, M.O. ; Spano, P. ; Nielsen, S.K.
Author_Institution :
PTT Res., Leidschendam, Netherlands
Abstract :
An interlaboratory comparison on four different linewidth measurement techniques is performed for twelve DFB lasers from various manufacturers. The measured linewidths agree very well for the lasers that have a flat frequency noise spectrum. Differences of more than a factor of 2 in measured linewidth for some of the other lasers can be explained by an increased level of the low frequency noise spectrum recognised by a Michelson interferometer. The conclusion is made that the application of the laser determines what is the best definition of linewidth and which is the best method for its measurement.
Keywords :
distributed feedback lasers; laser variables measurement; light interferometry; semiconductor junction lasers; spectral line breadth; COST 215 round robin; DFB laser linewidth measurement techniques; Fabry-Perot interferometer; Michelson interferometer; interlaboratory comparison; low frequency noise spectrum; power spectral density; self-heterodyning technique; self-homodyning technique;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19901304
