| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical real-time delay apparatus which is constructed so as to electrically, continuously and accurately control the real-time delay of a radio frequency (RF) signal without mechanical motion, by utilizing an optical fiber equipped with a Bragg grating with the characteristics of its effective refractive index being varied with the temperature variation, and a method for manufacturing the same. SOLUTION: The optical real-time delay apparatus comprises an optical fiber includes a core layer and a cladding layer wrapping the core layer, and having a taper portion formed at a certain part of an outer circumferential surface of the cladding layer; a distance from the taper portion to the core layer being gradually changed along the length direction of the taper portion; and a Bragg grating, formed on a uniform interval in the core layer placed within the section in which the taper portion of the optical fiber is formed; and a heating portion, formed on a part of the taper portion corresponding to the part where the Bragg grating is formed along the length direction of the optical fiber so as to surround the taper portion. COPYRIGHT: (C)2006,JPO&NCIPI |
