A photonic crystal fiber for supporting 30 orbital angular momentum modes with low dispersion

更新时间:2023-05-28

【摘要】This paper proposes a novel photonic crystal optical fiber which can support 30 orbital angular momentum（OAM） modes transmission and possesses relatively flat and low dispersion. The OAM modes can be well-separated due to the large effective refractive index difference(above 10-4) between the eigenmodes. The only material of the designed fiber is silica. The dispersion of each OAM mode is controlled in the range of 50—100 ps·nm-1·km-1 and the total dispersion variation is below 10 ps·nm-1·km-1 from 1 500 nm to 1 600 nm. Moreover, the confinement loss of each OAM mode is below 8.17× 10-10 dB/m at 1 550 nm, and the nonlinear coefficients is less than 0.71 W-1/km for all modes at 1550 nm. With all these good features, this proposed optical fiber is promising to be applied in fiberbased OAM communication systems.

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