Optical fiber, as a physical medium for information transmission, is the 'highway' of modern economic and social development.
Scientists develop DMG equalization strategy via femtosecond laser micromachining induced refractive index tailoring. DOI: 10.37188/lam.2024.014
Mode Division Multiplexing technology, which exponentially expands the capacity of communication systems by using multiple mutually orthogonal spatial modes within a few-mode fiber as independent transmission channels, has gained global research attention. Based on the precise and controllable RI tailoring, a specific attenuation spectrum can be applied to different guide mode groups according to their gain spectrum, leading to a successful DMG equalization. To verify the feasibility and advantages of the proposed DMG equalization strategy, they investigated a simple-structured and cost-effective FM-EDFA with uniform Erbium doping and fundamental mode core-pumping.
These scientists summarize the device operation principle as follows,"Simulation results show that, when the pump power and the EDF length vary from 200 mW to 600 mW and 1 m to 7m, DMG within LP01, LP11, and LP21 mode groups varied from 4.8 dB to 16.2 dB occurs. By cascading the DMG equalizer with optimal values of length L and ∆n, the DMGmax and DMGave over the C-band can be reduced from 10 dB to 1.52 dB and 8.95 dB to 0.78 dB, respectively.
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