期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 39, 期 13, 页码 4439-4446出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2021.3071266
关键词
Refractive index; Optical fiber networks; Optical fiber amplifiers; Crosstalk; Wavelength division multiplexing; Optical frequency conversion; Erbium-doped fiber amplifiers; Gain flattening; Erbium-doped fiber amplifier; few-mode fibers; long-period fiber gratings
资金
- National Science Foundation of China (NSFC) [61771024, 61627814, 61690194, 61901009, U20A20160]
- China National Postdoctoral Program for Innovative Talents [BX20200003]
- Shenzhen Science and Technology Plan [JCYJ 20170412153812353, 20180227175348359]
- Projects Foundation of YOFC [SKLD2003]
- Postdoctoral RFC [2018M641086, 2020M680236]
In this paper, a novel FM-GFF based on LPFG in DC-FMF is proposed to achieve independent gain flattening for each core mode. The weakly-coupled connection between DC-FMF and transmission FMF is maintained by their shared characteristics. Simulation results show that the proposed scheme can flatten the output gain spectra for all core modes in the DC-FMF to less than 0.6 dB in the entire C-band.
Recently, few-mode Erbium-doped fiber amplifiers (FM-EDFA) for mode-division multiplexing (MDM) transmission have attracted much interest. In this paper, we propose a novel few-mode gain-flattening filter (FM-GFF) based on long-period fiber gratings (LPFG) in double-cladding few-mode fiber (DC-FMF). Due to weak coupling among all the core modes and limited number of inner-cladding modes, the phase matching condition for a specific FM-LPFG can be satisfied only between one core mode and one inner-cladding mode each time and independent gain flattening can be realized for each core mode without influencing the other ones. Moreover, both DC-FMF and transmission FMF have the same core refractive index and radius, while the inner-cladding of DC-FMF and the cladding of transmission FMF have the same refractive index, which can effectively maintain the weakly-coupled condition for their connections. We show by simulation that the output gain spectra for all the 4 or 6 linearly-polarized (LP) core modes in two kinds of DC-FMFs can be independently flattened to less than 0.6-dB in the whole C-band by the cascading LPFGs in the DC-FMF. The proposed FM-GFF scheme is beneficial for the practical design of FM-EDFAs.
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