| 摘要 |
An optical device 1 comprises an optical I/O unit 10, a transmissive diffraction grating 21, a lens 30, and a mirror array 40. The transmissive diffraction grating 21 has gratings, each extending along an x axis, formed at a fixed period, wavelength-splits the light received from the input port, and outputs wavelength-split light components. The transmissive diffraction grating 21 is rotatable about a predetermined axis. The transmissive diffraction grating 21 outputs the wavelength light components into directions which correspond to the respective wavelengths and are perpendicular to the rotary axis. The lens 30 focuses the wavelength light components wavelength-split and output by the transmissive diffraction grating 21 at respective positions different from each other. |
