| 摘要 |
PROBLEM TO BE SOLVED: To provide a variable dispersion compensator capable of drastically reducing a ripple produced in a dispersion characteristic of a variable dispersion compensator of the conventional technique using a spatial phase modulator having an LCOS structure and having an operable band width which is larger than that in the conventional technique, whereby an application possibility other than the dispersion compensator is widened by removing the ripple produced in the dispersion characteristic. SOLUTION: In order to reduce reflection light in a gap part between retardation imparting functional parts, a transparent glass substrate or the like is used as a back surface substrate and, thereby, the reflection light is caused to disappear. An optical signal on the retardation imparting functional parts is reflected by a mirror array formed on the innermost surface of the back surface substrate. A mirror array having an electrode function can be also formed on the surface side opposite to a common transparent electrode on the back surface substrate. COPYRIGHT: (C)2009,JPO&INPIT |
