Optical: systems and elements – Light interference – Produced by coating or lamina
Reexamination Certificate
2005-06-21
2005-06-21
Sikder, Mohammad (Department: 2872)
Optical: systems and elements
Light interference
Produced by coating or lamina
C359S584000, C359S528000
Reexamination Certificate
active
06909550
ABSTRACT:
An optical apparatus for producing chromatic dispersion. The apparatus includes a virtually imaged phased array (VIPA) generator, a mirror and a lens. The VIPA generator receives an input light at a respective wavelength and produces a corresponding collimated output light traveling from the VIPA generator in a direction determined by the wavelength of the input light, the output light thereby being spatially distiguishable from an output light produced for an input light at a different wavelength. The mirror has a cone shape, or a modified cone shape. The lens focuses the output light traveling from the VIPA generator onto the mirror so that the mirror reflects the output light. The reflected light is directed by the lens back to the VIPA generator. In this manner, the apparatus provides chromatic dispersion to the input light. The modified cone shape of the mirror can be designed so that the apparatus provides a uniform chromatic dispersion to light in the same channel of a wavelength division multiplexed light. The mirror can be moved in a direction perpendicular to an angular dispersion direction of the VIPA generator, to change the amount of chromatic dispersion provided to the input light.
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Cao Simon
Shirasaki Masataka
Fujitsu Limited
Sikder Mohammad
Staas & Halsey , LLP
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