| 摘要 |
PURPOSE:To improve the adjusting efficiency of a phase error by reflecting the light by plural times in the middle of an optical fiber cable transmission line of an optical transmission channel and shifting the optical transmission time by each time required for each reflection of the light. CONSTITUTION:When a phase error is adjusted by a phase adjuster 3, a knob screw 3d-2 is turned to move an optical glass block 3b. The incident light supplied through an incident light window 3c-1 is repetitively reflected between the full reflecting films 3c and 3b-3. Then an emitting light window 3b-2 is set at the position of either one of those reflection. Thus the time is shifted by an extent equal to the reflecting frequency for each time (t) required for the single reflection so that the phase is adjusted. The time (t) can be changed into various values according to the incident angle of the light or the space set between both films 3c and 3b-3. In such a manner, the adjuster 3 which reflects the light is connected to an optical fiber cable. Then the phase error can be easily adjusted and the phase adjusting efficiency is improved. |
