Coherent combination optical fiber based on 45-degree inclined grating and all-optical-fiber system

• Main Authors: PENG JUE, FANG SIYUAN, HU JINMENG, ZHANG YANGJIE, LI YUAN, LIU HOUKANG, JIANG YONGLIANG, WU CHUNFENG, LI QIANG, ZHANG JING
• Format: Patent
• Language: Chinese; English
• Published: 07.04.2023
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

The invention discloses a coherent combination all-fiber based on 45-degree inclined gratings, which comprises N optical fibers corresponding to N sub-beam lasers, and the N optical fibers comprise a plurality of pairs of 45-degree inclined grating groups for realizing polarization reflection or beam combination of n-level pairwise optical fiber lasers; the first-stage reflection or beam combination comprises N/2 pairs of 45-degree inclined grating groups which have the same axial position and are symmetrical along the x axis in the radial direction; the second-stage reflection or beam combination comprises N/4 pairs of 45-degree inclined grating groups which have the same axial position and are symmetrical along the y axis in the radial direction; the n-stage combined beam comprises N/2n pairs of 45-degree inclined grating groups with the same axial position; corresponding systems and methods are also disclosed. The problems of dynamic inclination and jitter of a coherent combination space optical path, inco