TY - JOUR

T1 - Femtosecond-pulse inscription of fiber Bragg gratings with single or multiple phase-shifts in the structure

AU - Wolf, Alexey

AU - Dostovalov, Alexandr

AU - Skvortsov, Mikhail

AU - Raspopin, Kirill

AU - Parygin, Alexandr

AU - Babin, Sergey

N1 - Publisher Copyright: © 2017 Elsevier Ltd

PY - 2018/5/1

Y1 - 2018/5/1

N2 - 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 π 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 π-phase-shifted grating inscribed in an active Er-doped fiber forms high-quality DFB 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.

AB - 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 π 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 π-phase-shifted grating inscribed in an active Er-doped fiber forms high-quality DFB 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.

KW - Distributed feedback laser

KW - Femtosecond laser micromichining

KW - Fiber Bragg grating

KW - Refractive index change

KW - LASER

KW - STANDARD OPTICAL-FIBER

KW - FABRICATION

UR - http://www.scopus.com/inward/record.url?scp=85034821601&partnerID=8YFLogxK

U2 - 10.1016/j.optlastec.2017.11.017

DO - 10.1016/j.optlastec.2017.11.017

M3 - Article

AN - SCOPUS:85034821601

VL - 101

SP - 202

EP - 207

JO - Optics and Laser Technology

JF - Optics and Laser Technology

SN - 0030-3992

ER -