Lasers, Fiber Optics, and Communications

Effects of macro-bending on 1500-nm amplified spontaneous emission, gain, and noise figure of erbium-gallium co-doped fiber

[+] Author Affiliations
Leong Chia Jian, Hairul Azhar Abdul Rashid, Mohd Ridzuan Mokhtar

Multimedia University, Faculty of Engineering, Persiaran Multimedia, Cyberjaya, Selangor 63100, Malaysia

Opt. Eng. 54(12), 126109 (Dec 18, 2015). doi:10.1117/1.OE.54.12.126109
History: Received October 8, 2015; Accepted November 17, 2015
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Abstract.  The relationships among macro-bending loss, power of the 1500-nm amplified spontaneous emission (ASE), gain, and noise figure of an erbium-gallium co-doped silica fiber amplifier are investigated and explained. The dependence of macro-bending loss on different bending radii is examined. Using different fiber lengths and bending radii, the effects of macro-bending on ASE, gain, and noise figure are analyzed in comparison to an unbent fiber. The ASE power changes because macro-bending alters the number of Er3+ ions in the I13/24 level that decay to the I15/24 level emitting photons of shorter and longer wavelengths. The trade-off relationship that exists between the change in the ASE power and signal loss, where both result from macro-bending, explains the gain change. Fiber length also affects the changes in the ASE power and gain. Noise figure in the longer-wavelength region increases. In the shorter-wavelength region, for a long fiber, the noise figure improves only slightly. For a short fiber, it worsens due to gain decrement. The findings from this study explain the reason for gain improvement upon suppressing either a competing or a noncompeting ASE via filters or macro-bending in other rare-earth-doped fibers.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Leong Chia Jian ; Hairul Azhar Abdul Rashid and Mohd Ridzuan Mokhtar
"Effects of macro-bending on 1500-nm amplified spontaneous emission, gain, and noise figure of erbium-gallium co-doped fiber", Opt. Eng. 54(12), 126109 (Dec 18, 2015). ; http://dx.doi.org/10.1117/1.OE.54.12.126109


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