Selective mode conversion using phase plates for 10-mode fiber

We investigate mode conversion using phase plates for 10-mode fibers. Crosstalk from undesirable modes is unavoidable for mode conversion to LP<sub>11</sub> or LP<sub>12</sub> due to imperfection of phase-plate-based mode conversion, while it can be suppressed for LP<sub>02</sub>, LP<sub>21</sub>, and LP<sub>31</sub>.