McGinn & Gibb, PLLC
Wavelength correction method and apparatus, wavelength check method and apparatus, arrayed waveguide diffraction grating, and interleaver
According to this invention, there are provided a wavelength correction method and apparatus which can easily correct the wavelength characteristics of an optical element such as an arrayed waveguide diffraction grating in a slab waveguide or another waveguide, and a wavelength check method and apparatus which check the quality of a waveguide. A center wavelength &lgr;0 of light having a predetermined wavelength &lgr;, emitted from a light source, is obtained at the initial position of an input-side slab waveguide which is cut into a first input-side waveguide component and a second input-side waveguide component. When a light component having a first wavelength &lgr;s on the short wavelength side and a light component having a second wavelength &lgr;1 on the long wavelength side, centered on a desired wavelength &lgr;g, are sequentially output from the light source, the amount of each light component is measured while the relative position of the input-side slab waveguide is changed. The positional relationship between the first and second input-side waveguide components is fixed to the relative position of the two components at which the levels of light components from them coincide with each other. In this manner, the center wavelength &lgr;g can be easily corrected.
NEC Corporation
G G
G02B G02B
inventional inventional
Shinya
Watanabe