Optical coupler for optical direct amplifier
First Claim
1. An optical coupler for an optical direct amplifier using stimulated Raman effect in which pump light is wavelength multiplexed with signal light and multiplexed light is applied to a transmission optical fiber, comprising;
- a polarization multiplex prim for multiplexing two linear polarization beams with the same wavelength and perpendicular polarization planes generated by semiconductor lasers, and for providing a single output multiplexed beam,a wavelength multiplexer optically coupled with said single output multiplexed beam of said polarization multiplex prism so that the output of said polarization multiplex prism is wavelength division multiplexed with signal light, andthe output of said wavelength multiplexer being applied to a single transmission optical fiber.
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Abstract
A high power pump light source for optical direct amplifier using the stimulated Raman effect is obtained by using a plurality of semiconductor lasers each of which provides low output power. More than two beams of the same wavelength generated by semiconductor lasers are combined (polarization multiplex) by using a polarization prism block, which provides sufficient high power pump light for the stimulated Raman effect amplifier. The output of said polarization prism block is wavelength division multiplexed with signal light to be amplified by using an interference filter block, the output of which is applied to a transmission optical fiber in which amplification of said signal light is effected.
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Citations
6 Claims
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1. An optical coupler for an optical direct amplifier using stimulated Raman effect in which pump light is wavelength multiplexed with signal light and multiplexed light is applied to a transmission optical fiber, comprising;
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a polarization multiplex prim for multiplexing two linear polarization beams with the same wavelength and perpendicular polarization planes generated by semiconductor lasers, and for providing a single output multiplexed beam, a wavelength multiplexer optically coupled with said single output multiplexed beam of said polarization multiplex prism so that the output of said polarization multiplex prism is wavelength division multiplexed with signal light, and the output of said wavelength multiplexer being applied to a single transmission optical fiber. - View Dependent Claims (2, 3, 4, 5)
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6. An optical coupler for an optical direct amplifier using stimulated Raman effect in which pump light is wavelength multiplexed with signal light and multiplexed light is applied to a transmission optical fiber for amplification, comprising;
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a first polarization prism for multiplexing two linear polarization beams of first wavelength (γ
1) generated by semiconductor lasers,a second polarization prism for multiplexing two linear polarization beams of second wavelength (γ
2) which is close to said first wavelength, generated by semiconductor lasers,a first wavelength multiplexer for multiplexing outputs of said first polarization prism and said second polarization prism, a second wavelength multiplexer for multiplexing the output of said first wavelength multiplexer with signal light so that the output of second wavelength multiplexer is applied to a transmission optical fiber, and said first polarization prism, and said second polarization prism are directly coupled with first wavelength multiplexer, which is directly coupled optically with second wavelength multiplexer.
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Specification