Dispersion compensator whose transmission band is flattened
AssigneeFujitsu Limited
InventorsYuichi Kawahata, Nobuaki Mitamura
Life of this patent
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Abstract
Light input from a single-mode fiber is collected into linear light beams by a line focuser, and collected on a VIPA element. A light beam output from the VIPA element is made to pass through a space filter having a predetermined transmission loss characteristic, and focused on a mirror with a focusing lens. The light is reflected by the mirror, again passes through the space filter via the focusing lens, enters the VIPA element, and again enters the single-mode fiber via the line focuser. The insertion loss wavelength characteristic of the wavelength dispersion compensator using the VIPA element is optimized by being superimposed on the transmission loss characteristic of the space filter.
Claims12
A dispersion compensator, comprising:
- a wavelength dispersion compensating unit comprising an angular dispersing unit outputting input light in a different direction depending on each wavelength, and a mirror unit reflecting the light output from the angular dispersing unit, and again inputting the light to the angular dispersing unit;
- and
- an optimizing unit optimizing an insertion loss wavelength characteristic of said wavelength dispersion compensating unit.
Dependencies are inferred from the claim text.