Tapered fiber amplifier
Abstract
A tapered optical fiber amplifier is designed to provide for long-distance, un-repeatered fiber optic communications. Two single-mode fiber portions are tapered to efficiently intensify and couple an information signal from a laser diode and a pump signal at a shorter wavelength into a fused, tapered single-mode fiber optic coupler. The concentrated information signal and concentrated pump signal are combined via the coupler which is coupled to a several-kilometer length of a relatively small core diametered single-mode fiber to create nonlinear optical effect (stimulated Raman scattering) (SRS). The SRS causes Raman shift of the pump light into the small core diametered single-mode fiber length, thereby generating SRS to result in a signal amplification and an efficient extraction of the amplified signal via the tapered output fiber portion or pigtail.
- Publication:
-
Patent Department of the Navy
- Pub Date:
- July 1990
- Bibcode:
- 1990navy.reptT....R
- Keywords:
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- Couplers;
- Fiber Optics;
- Light Amplifiers;
- Optical Communication;
- Optical Coupling;
- Patents;
- Raman Spectra;
- Signal Processing;
- Communications and Radar