| 摘要 |
A grating device has a waveguide array cyclically arranged. A horned waveguide is used in a star coupler of the grating device. An optical signal is divided into streams. The streams are slanted from original central axes. Or, a waveguide having an asymmetrical structure is used. Thus, a flat-top pass-band of the optical signal is obtained. The present invention can be used in any optical device.
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