Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1992-01-21
1992-08-11
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Optical fiber
359307, 372 6, 372 71, H01S 330, G02B 626
Patent
active
051384833
ABSTRACT:
An optical, low-noise amplifier of the active-fiber type, which fiber contains a laser light emitting substance, adapted to be connected to an optical telecommunication fiber and receiving light therefrom at the transmission wavelength. The active fiber is also fed from a light source at a pumping wavelength and has a length corresponding to a partial absorption of the pumping light. Downstream of active fiber, there is a selective mirror device which reflects the light at the pumping wavelength and is transparent to the transmission wavelength light. Preferably, the mirror device consists of an optical demultiplexer adapted to separate the transmission wavelength and the pumping wavelength on two output fibers. A mirror which reflects the pumping wavelength is present at the end of the fiber carrying the pumping wavelength.
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Morhel, P. R.; "All-Fibre, Diode-Pumped Recirculating-Ring Delay Line"; Elect. Att., vol. 24, #10, May 12, 1988, pp. 608-609 , (GB).
Fontana Flavio
Grasso Giorgio
Righetti Aldo
Moskowitz Nelson
Societa Cavi Pirelli S.p.A.
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