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US 4,786,140 AGranted
Method of modulating large-power light beams using fiber raman amplification
AssigneeGTE Laboratories Incorporated
InventorsPaul Melman, Mark L. Dakss
Life of this patent
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Abstract
Fast modulation on a low-power laser beam is transferred to a high-power beam when the high-power beam pumps to depletion the amplification of the low-power beam in a fiber Raman amplifier.
Claims6
A method of modulating a continuous-wave large-power light beam with Raman amplification comprising the steps of
- providing a length of low-loss optical fiber having an input end and an output end;
- applying said large-power light beam at a pump wavelength .lambda..sub.1 to said input end of said optical fiber, whereby
- said output end of said fiber normally provides a first continuous-wave output beam at said pump wavelength .lambda..sub.1 and a second output beam at a wavelength .lambda..sub.2, where the intensity of said first output beam is much higher than the intensity of said second output beam;
- and
- then, applying said large-power light beam at said pump wavelength .lambda..sub.1 to said input end of said optical fiber, and applying a weak modulated optical signal at said wavelength .lambda..sub.2 to said input end of said optical fiber, whereby
- said optical fiber, at said output end, provides a significantly modulated large-power light beam at said pump wavelength .lambda..sub.1.
3 more elements
A method of modulating a large-power light beam with Raman amplification comprising the steps of
- providing a length of low-loss optical fiber having an input end and an output end;
- applying a light beam at a pump wavelength .lambda..sub.1 to said input end of said optical fiber of such an intensity that
- said output end of said fiber provides a first output beam at said pump wavelength .lambda..sub.1 and a second output beam at a wavelength .lambda..sub.2, where the intensity of said first output beam is much higher than the intensity of said second output beam;
- and
- applying a weak modulated optical signal at said wavelength .lambda..sub.2 to said input end of said optical fiber, whereby
- said optical fiber, at said output end, provides a significantly modulated large-power light beam at said pump wavelength .lambda..sub.1.
3 more elements
Dependencies are inferred from the claim text.