| 摘要 |
PURPOSE:To obtain a small-sized phase modulator which is manufactured easily and facilitates and secures a connection with an optical fiber by mounting a thin-film heater on the circumference of the clad of the single-mode optical fiber, and applying high-frequency electric power. CONSTITUTION:The thin-film heater 6 made of Ni-Cr material is mounted on the circumference of the clad where the silicon coating 2 is removed from the single-mode optical fiber 1. This heater 6 and a high-frequency power source 9 connected thereto constitute a fiber type phase modulator 3, and the electric power of the power source 9 is supplied to the heater 6 to vary the refractive index, thereby causing a phase shift. Consequently, the fiber type phase modulator is manufactured easily to small size, and the connection with the optical fiber is made easily and securely to prevent an increase in reflection loss, etc. |
