| 摘要 |
Optical signal devices and methods of forming the same in which a substrate is provided with a pair of spaced apart cladding layers made of a material having a first refractive index, having sandwiched therebetween a core layer including a pair of waveguides having a second refractive index greater than the first refractive index and a grating region including a filter extending through the core and cladding layers for causing a single wavelength of light of a multiple wavelength light source to be segregated therefrom.
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