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EP0268523A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

An optical launching device for optical direct amplifier

Assignee: Oki Electric Industry Co Ltd
•
Filing: 1987-11-03
•
Granted: —
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Expires: 2007-11-03
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Abstract

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 (11, 12) 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 (15) block (15), 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 (16), output of which is applied to a transmission optical fiber (13d) in which amplification of said signal light is effected.

Inventors

  • 👤 Yasuaki Tamura
  • 👤 Kiyofumi Mochizuki

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-01 14:50
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/42; G02B6/4201; G02B6/4246; G02B6/26; G02B6/28; G02B6/293; G02B6/29346; G02B6/29361; G02B6/29362; G02B6/29365; G02B6/29367; H; H01; H01S; H01S3/00; H01S3/30; H01S3/302

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 91 words
(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 prism for multiplexing two linear polarization beams with the same wavelength as each other generated by semiconductor lasers, a wavelength multiplexer optically coupled with said polarization prism so that output of said polarization prism is wavelength division multiplexed with signal light, and an output of said wavelength multiplexer being applied to a transmission optical fiber.
Claim 2
Dependent Claim 25 words
(2) An optical coupler according to claim 1, wherein wavelength of said semiconductor lasers is 1.2 µm, and wavelength of signal light is 1.3 µm.
Claim 3
Dependent Claim 25 words
(3) An optical coupler according to claim 1, wherein wavelength of said semiconductor lasers is 1.4 µm, and wavelength of signal light is 1.5 µm.
Claim 4
Dependent Claim 19 words
(4) An optical coupler according to claim 1, wherein said polarization prism is directly coupled with said wavelength multiplexer.
Claim 5
Dependent Claim 16 words
(5) An optical coupler according to claim 1, wherein said wavelength multiplexer is an interference filter.
Claim 6
Dependent Claim 151 words
(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; a first polarization prism for multiplexing two linear polarization beams of first wavelength (λ₁) generated by semiconductor lasers, a second polarization prism for multiplexing two linear polarization beams of second wavelength (λ₂) 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 output of said first wavelength multiplexer with signal light so that 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.

References Cited (Backward Citations)

EP0146262A2 Cited
EP0186299A2 Cited

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