Title :
Group-delay ripple reduction in step-chirped fiber Bragg gratings by using laser-beam written step-chirped phase masks
Author :
Komukai, Tetsuro ; Inui, Tetsuro ; Kurihara, Masaaki ; Fujimoto, Shigekazu
Author_Institution :
NTT Network Innovation Labs., NTT Corp., Kanagawa, Japan
Abstract :
Step-chirped phase masks for step-chirped fiber Bragg gratings (FBGs) were fabricated by employing a new writing strategy, in which the beam is able to scan a step-chirped pattern all at once or continuously. This new writing strategy was realized by using a raster scan-type laser-beam writing system. Linearly and nonlinearly step-chirped FBGs, fabricated by using these masks, show very low group-delay ripple characteristics, which means that the masks have fewer stitching errors than conventional step-chirped masks.
Keywords :
Bragg gratings; chirp modulation; delays; laser materials processing; optical fibre fabrication; optical modulation; phase shifting masks; group-delay ripple reduction; laser-beam written step-chirped phase masks; low group-delay ripple characteristics; raster scan-type laser-beam writing system; step-chirped fiber Bragg gratings; step-chirped masks; stitching errors; writing strategy; Bandwidth; Bragg gratings; Chirp; Delay; Fiber gratings; Fiber lasers; Laboratories; Laser beams; Optical fiber devices; Writing;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2002.803367
