Reduction of stimulated brillouin scattering in a fiber optic tr

Details Reduction of stimulated brillouin scattering in a fiber optic tr Reduction of stimulated brillouin scattering in a fiber optic tr

1992-10-28

1994-07-12

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359160, 359161, 359188, H04B 1012

Patent

active

053293967

ABSTRACT:
A technique for reducing the power threshold at which stimulated brillouin scattering ("SBS") occurs within an optical fiber by directly modulating a conventional laser generating an optical signal propagated along that fiber. The modulation is accomplished by employing an alternating waveform to induce a dither upon the laser output. The specific frequency of the alternating waveform is chosen to be very much lower than the low frequency cut-off of any receiver coupled to the optical fiber, but sufficiently high enough to efficiently suppress the Brillouin gain. This dithering causes the laser to be frequency modulated, thereby broadening the effective linewidth of the laser output and increasing the SBS power threshold.

REFERENCES:
patent: 4699452 (1987-10-01), Mollenauer
patent: 4769820 (1988-09-01), Holmes
patent: 4817207 (1989-03-01), Smith et al.
patent: 4918751 (1990-04-01), Pessot et al.
"Input Power Limits of Single-Mode Optical Fibers due to Stimulated Brillouin Scattering in Optical Communication Systems" Aoki, et al., J. of Lightwave Tech., vol. 6, No. 5 May 1988 pp. 710-719.

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