| 摘要 |
A photo isolator transmits light of a frequency fo in the normal direction and substantially intercepts the light in the reverse direction. A phase modulator comprising an optical crystal having a refractive index, counter faces and counter electrodes formed on the counter faces. The phase modulator receives an electrical signal having a frequency of DELTA f or higher and changes the refractive index of the optical crystal by the Pockels effect. A narrow band pass filter has a half band width of DELTA f, is mounted on an optical axis, and substantially transmits light having frequency of from (fo- DELTA f) to (fo+ DELTA f). The phase modulator is juxtaposed with the narrow band pass filter on the optical axis.
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