Mach–Zehnder fiber interferometer for measuring the spectral characteristics of single-frequency semiconductor lasers of the 1.32‐μm and 1.55‐μm range

Булгакова С.А., Дмитриев А.Л. Волоконный интерферометр Маха-Цендера для измерений спектральных характеристик одночастотных полупроводниковых лазеров диапазона 1,32 мкм и 1,55 мкм // Оптический журнал. 2008. Т. 75. № 9. С. 49–53.

Bulgakova S.A., Dmitriev A.L. Mach–Zehnder fiber interferometer for measuring the spectral characteristics of single-frequency semiconductor lasers of the 1.32‐μm and 1.55‐μm range [in Russian] // Opticheskii Zhurnal. 2008. V. 75. № 9. P. 49–53.

S. A. Bulgakova and A. L. Dmitriev, "Mach–Zehnder fiber interferometer for measuring the spectral characteristics of single-frequency semiconductor lasers of the 1.32‐μm and 1.55‐μm range," Journal of Optical Technology. 75 (9), 574-577 (2008). https://doi.org/10.1364/JOT.75.000574

This paper describes the design of a Mach-Zehnder fiber interferometer based on a single-mode optical fiber with a path difference from 2mto10.3km. The phase modulator of the interferometer is made in the form of a coil of fiber on a metallic cylinder, in which acoustic vibrations are excited a piezoelectric converter. The results of interferometric studies are presented for commercial single-frequency semiconductor lasers with fiber Bragg gratings (FBGs) of the 1.32 and 1.55-μm range. It is shown that the short-term line width (a few seconds to a few tens of seconds) of the spectrum of semiconductor lasers with fiber Bragg reflectors is less than 20kHz; in this case, such lasers are not strictly single-frequency lasers and based at several (two or more) closely spaced spectral lines.