Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1997-08-19
1999-12-28
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Optical fiber
359134, 359160, 372 6, H01S 313, H01S 3091, G02B 626
Patent
active
060089334
ABSTRACT:
An optical amplifier makes use of a co-propagating fiber amplifier stage and a counter propagating fiber amplifier stage. One of the stages is preferably a low noise stage, while the other is a high gain stage, typically the output stage. The low noise stage may have a small core fiber while the high gain stage has a large core fiber. Pumping energy is introduced into the amplifier by coupling a plurality of laser sources in the same wavelength range using a narrow channel wavelength division multiplexer coupler. In each stage of the amplifier, some portion of the pump energy is transferred from the pumping wavelength to the signal wavelength. In a single polarization optical signal generator embodiment, the optical signal is developed in a distributed Bragg reflector oscillator having an output Bragg grating embedded in a polarization perserving fiber. A polarization controller is used at the amplifier output to restore the single polarization which is developed in the oscillator.
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Fidric Bernard G.
Grubb Stephen G.
Moskowitz Nelson
SDL Inc.
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