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US 2001/0012431 A1Published application
Light limiter
AssigneeNEC Corporation
InventorsYasuhisa Taneda, Takaaki Ogata, Hirotoshi Nagata, Kaoru Higuma, Junichiro Ichikawa
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Abstract
The object of the present invention is to provide a light limiter which can control the generation of an optical surge, comprises few components, and has high reliability; in order to achieve the object, the light limiter of the present invention comprise a parametric amplification element parametrically amplifying an input signal light, and a wavelength selection element removing a wavelength component, excepting a specified wavelength, from among the signal light output from said parametric amplification element.
Claims5
A light limiter comprising:
- a parametric amplification element which parametrically amplifying an input signal light having an optical surge to produce an output signal, the parametric amplification element including an optical waveguide element that inhibits the transmission of the optical surge in the output signal;
- and
- a wavelength selection element that selects a specified wavelength component from the output signal and emits a signal having the specified wavelength component.
Dependencies are inferred from the claim text.