Optical systems making use of phenomenon of stimulated brillouin scattering
AssigneeFujitsu Limited
InventorShigeki Watanabe
Life of this patent
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Abstract
An optical signal generator, an optical communication system, and a method for searching for a Fresnel reflection point in an optical transmission line make use of characteristic features of stimulated Brillouin scattering (SBS). In the optical signal generator, exciting light supplied to an optical transmission line, formed of a nonlinear optical medium, showing stimulated Brillouin scattering, is amplitude-modulated with an information signal. The threshold value for stimulated Brillouin scattering in the optical medium is positioned between a high level and a low level of the modulated waveform.
Claims10
An optical signal generator making use of the phenonmenon of stimulated Brillouin scattering comprising:
- optical modulating means for modulating exciting light with a first information signal to thereby output amplitude-modulated light;
- an optical transmission line formed of a nonlinear optical medium showing stimulated Brillouin scattering and operatively connected with said optical modulating means for propagating said amplitude modulated light therethrough;
- and
- control means operatively connected with said optical modulating means for controlling said optical modulating means so that the threshold value for stimulated Brillouin scattering in said optical medium is positioned between a high level and a low level of the modulated waveform of said amplitude-modulated light with said first information signal;
- wherein
- modulated stimulated Brillouin scattered light is generated in said optical transmission line in the direction opposite to the propagating direction of said amplitude-modulated light.
An optical signal generator for transmitting optical information through an optical medium having a stimulated Brillouin scattering threshold comprising:
- optical modulating means for modulating exciting light with a first information signal to produce amplitude-modulated light, and for outputting the amplitude-modulated light in a propagating direction with a high level above said stimulated Brillouin scattering threshold and a low level below said Brillouin scattering threshold;
- wherein
- modulated stimulated Brillouin scattered light is generated in said optical medium in a direction opposite to the propagating direction of the amplitude-modulated light when the amplitude-modulated light exceeds the stimulated Brillouin scattering threshold.
Dependencies are inferred from the claim text.