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A fiber Bragg grating is inscribed in a two-mode fiber using a 193-nm excimer laser and a phase mask. Strong LP01 and LP11 mutual coupling as large as -22.5 dB, which corresponds to a modal conversion efficiency of more than 99%, is experimentally achieved. The intermodal coupling mechanism is theoretically analyzed through a finite element method. This device can be used as a low-cost reflective LP01 &#x2194; LP11 converter.

ieee photonics journal

Strong <formula formulatype="inline"><tex Notation="TeX">$\hbox{LP}_{01}$</tex></formula> and <formula formulatype="inline"><tex Notation="TeX">$\hbox{LP}_{11}$</tex></formula> Mutual Coupling Conversion in a Two-Mode Fiber Bragg Grating

Strong $\hbox{LP}_{01}$ and $\hbox{LP}_{11}$ Mutual Coupling Conversion in a Two-Mode Fiber Bragg Grating