| 摘要 |
PURPOSE:To suppress the deterioration in transmission characteristic by forming a reflecting film to the clad part on both faces of an optical fiber. CONSTITUTION:The optical fixed attenuator, one end of which is used as an optical connector plug and the other end as an optical receptacle, is used as an object and the reflecting film 9 is formed to the clad part 8 of the optical fiber 1 at both end faces of the optical fiber 1. A spacer 3 is provided to the receptacle side of a terminal fitting 2 and the quantity of loss (quantity of attenuation) is determined by the length of this spacer 3. Since the reflecting film 9 is formed to the clad part 8 of the optical fiber 1, the light propagation of a clad mode in the juncture of the connector plug of a transmission line and the connector plug of the optical fixed attenuator can be suppressed. The interference of the clad mode propagated light at the other end of the optical fixed attenuator and the core mode propagated light is thereby suppressed and the deterioration in the transmission characteristic is suppressed. |
