0-9 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
In an optical fiber, an undesired decrease in the refractive index at the center of the core. Note: An index dip is an artifact of certain manufacturing processes. Synonym profile dip.