Few-mode Fiber with Depressed Core and Trench Assisted Cladding
In order to reduce crosstalk and improve bend resistant performance,a few mode fiber with a de-pressed core and trench assisted cladding is proposed.The few mode fiber can support 7 LP modes within the wave length range of 1.36～1.56 μm.The introduction of trench in the cladding makes the bending loss less than 1×10-7 dB/mata bending radius of 1 cm,the effective refractive index difference between each modes is higher than 10-3.Based on the finite element method,the influences of structural parameters such as depressed core,trench on the ef-fective refractive index,mode field area,and bending performance are analyzed.Numerical analysis results show that the introduction of trench is beneficial for reducing bending losses of higher-order modes.
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