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Controlled Excitation of Supermodes in a Multicore Fiber with a 5 × 5 Square Array of Strongly Coupled Cores
- Source :
- Photonics, Vol 8, Iss 314, p 314 (2021), Photonics, Volume 8, Issue 8
- Publication Year :
- 2021
- Publisher :
- MDPI AG, 2021.
-
Abstract
- Coherent propagation of supermodes in a multicore fiber is promising for power scaling of fiber laser systems, eliminating the need for the active feedback system to maintain the phases between the channels. We studied the propagation of broadband pulsed radiation at a central wavelength of 1030 nm in a multicore fiber with coupled cores arranged in a square array. We designed and fabricated a silica multicore fiber with a 5 × 5 array of cores. For controllable excitation of a desired supermode, we developed a beam-forming system based on a spatial light modulator. We experimentally measured intensity and phase distributions of the supermodes, in particular, the in-phase and out-of-phase supermodes, which matched well the numerically calculated profiles. We obtained selective excitation and coherent propagation of broadband radiation with the content of the out-of-phase supermode of up to 90% maintained without active feedback. Using three-dimensional numerical modeling with allowance for a refractive index profile similar to those of the developed fiber, we demonstrated stable propagation of the out-of-phase supermode and collapse of the in-phase supermode at a high signal power.
- Subjects :
- Materials science
Phase (waves)
Physics::Optics
nonlinear light propagation
Refractive index profile
01 natural sciences
Signal
010309 optics
supermode
Nonlinear Sciences::Adaptation and Self-Organizing Systems
Optics
Fiber laser
0103 physical sciences
Applied optics. Photonics
Radiology, Nuclear Medicine and imaging
Fiber
Laser power scaling
010306 general physics
spatial light modulator
Instrumentation
multicore fiber
Spatial light modulator
business.industry
Atomic and Molecular Physics, and Optics
TA1501-1820
Wavelength
business
Subjects
Details
- ISSN :
- 23046732
- Volume :
- 8
- Database :
- OpenAIRE
- Journal :
- Photonics
- Accession number :
- edsair.doi.dedup.....15e027689672b4d82768f6a66cf6ddf7