Femtosecond pulse delivery using a chirped long-period grating of multi-mode fiber for mode conversion. (English) Zbl 1195.78052
Summary: A period-chirped long-period fiber grating (CLPFG), using ordinary multi-mode fiber (MMF), for broadband mode conversion (60 nm bandwidth of coupling efficiency \(>90\%\)) has been proposed. Through using such a MMF-CLPFG, a broad-spectrum pulse can be converted into \(LP_{02}\) for femtosecond pulse distortion-free delivery in MMF. The simulation shows that the pulse suffers less nonlinear distortion than that in a single-mode fiber. In addition, the negative pre-chirp introduced by MMF-CLPFG can offset the linear and positive SPM-induced frequency chirp and thus compress the pulse. Using this scheme, an initial 18 kW peak power 75 fs pulse distortion-free delivery in MMF has been numerically demonstrated.
MSC:
| 78A60 | Lasers, masers, optical bistability, nonlinear optics |
| 78A40 | Waves and radiation in optics and electromagnetic theory |
Keywords:
long-period fiber grating; fiber grating; multi-mode fiber; mode conversion; femtosecond pulse delivery; pulse propagation; temporal solitonReferences:
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