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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsShinichi Wakabayashi, Hitomi Moriya, Yoshinori Takeuchi, Asako Baba
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An optical delay line of a configuration in which a number of components such as a circulator and an optical coupler is reduced is to be provided. To this end, the optical delay line has a configuration in which, after an optical fiber diffraction grating having a core subjected to refractive index modulation and a cladding partly cleared of its outer circumference and an optical fiber having a cladding partly cleared of its outer circumference are brought close to each other so that the cores have mutually parallel directions of an optical axis to fabricate a directional coupler, both ends of the optical fiber are connected into an optical fiber loop. In this way, an optical delay line to generate a specific time delay for controlling optical signals can be provided in small dimensions and with a small number of components.
An optical delay line provided with a directional coupler wherein a first waveguide consisting of an optical fiber diffraction grating having a core subjected to refractive index modulation and a cladding partly cleared of its outer circumference and a second waveguide consisting of an optical fiber having a cladding partly cleared of its outer circumference are brought close to each other to cause said core and another core to have mutually parallel directions of an optical axis, and with means for optically connecting both ends of said second waveguide.
A method for manufacturing an optical delay line comprising:
Dependencies are inferred from the claim text.