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L. SHANG1,* , Z. Q. SONG2
We investigate the characteristics of pump mode distribution in a double-clad fiber with octagonal inner cladding by measuring the intensity profile of pump waves. The pump modes present an approximate flat-top distribution with a slight dip in the center of the inner cladding with normal fiber coiling. By twisting the normal fiber spool, the distribution of pump modes becomes more remarkably flat-topped for the improvement of pump absorption. The measured results could verify the validity of assuming the pump overlap integral factor as the area ratio of the doped core to the inner cladding. The deterioration of pump coupling efficiency causes the diffusion of pump modes, making against the pump absorption..
Double-clad fiber (DCF), Octagonal inner cladding, Pump absorption, Mode distribution.
L. SHANG, Z. Q. SONG, Characteristics of pump mode distribution in a double-clad fiber with octagonal inner cladding, Optoelectronics and Advanced Materials - Rapid Communications, 4, 5, May 2010, pp.613-615 (2010).
Submitted at: March 11, 2010
Accepted at: May 20, 2010
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
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