Optical waveguide and their application of the optical communication system
AssigneesHitachi, Ltd., Hitachi Chemical Company, Ltd.
InventorsMakoto Takahashi, Tatemi Ido, Hirohisa Sano, Tomoaki Shibata
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Abstract
An optical transmitter/receiver module of wavelength division multiplexing type which undergoes a reduced excess loss resulting from the displacement of a dicing position is fabricated with a high yield rate. An optical waveguide for guiding reflected light from a wavelength selection filter has a core substantially larger in size than the core of each of the other optical waveguides.
Claims20
An optical waveguide including, on a substrate, a clad formed of a transparent material, and a core formed of a transparent material having a refractive index higher than a refractive index of the clad, said optical waveguide comprising at least:
- a first optical waveguide;
- a filter, a mirror structure, or a substrate end structure for reflecting light from said first optical waveguide;
- and
- a second optical waveguide provided to receive reflected light from said first optical waveguide,
- a typical value or an average value of a diameter, a width, or a thickness of the core of said second optical waveguide being adjusted to be substantially not less than twice and not more than twenty times as large as a typical value or an average value of a diameter, a width, or a thickness of the core of said first optical waveguide.
Dependencies are inferred from the claim text.