Инд. авторы:	Wolf A., Dostovalov A., Skvortsov M., Raspopin K., Parygin A., Babin S.
Заглавие:	Femtosecond-pulse inscription of fiber Bragg gratings with single or multiple phase-shifts in the structure
Библ. ссылка:	Wolf A., Dostovalov A., Skvortsov M., Raspopin K., Parygin A., Babin S. Femtosecond-pulse inscription of fiber Bragg gratings with single or multiple phase-shifts in the structure // Optics and Laser Technology. - 2018. - Vol.101. - P.202-207. - ISSN 0030-3992 . - EISSN 1879-2545.
Внешние системы:	DOI: 10.1016/j.optlastec.2017.11.017; SCOPUS: 2-s2.0-85034821601; WoS: 000424316900025;
Реферат:	eng: In this work, long high-quality fiber Bragg gratings with phase shifts in the structure are inscribed directly in the optical fiber by point-by-point technique using femtosecond laser pulses. Phase shifts are introduced during the inscription process with a piezoelectric actuator, which rapidly shifts the fiber along the direction of its movement in a chosen point of the grating with a chosen shift value. As examples, single and double pi phase shifts are introduced in fiber Bragg gratings with a length up to 34 mm in passive fibers, which provide corresponding transmission peaks with bandwidth less than 1 pm. It is shown that 37 mm pi-phase-shifted grating inscribed in an active Er-doped fiber forms high-quality DEB laser cavity generating single-frequency radiation at 1550 nm with bandwidth of 20 kHz and signal-to-noise ratio of >70 dB. The inscription technique has a high degree of performance and flexibility and can be easily implemented in fibers of various types. (C) 2017 Elsevier Ltd. All rights reserved.
Ключевые слова:	STANDARD OPTICAL-FIBER; Distributed feedback laser; FABRICATION; Femtosecond laser micromichining; Fiber Bragg grating; Refractive index change; LASER;
Издано:	2018
Физ. характеристика:	с.202-207