Optical: systems and elements – Optical amplifier – Optical fiber
Reexamination Certificate
2005-03-22
2005-03-22
Tarcza, Thomas H. (Department: 3663)
Optical: systems and elements
Optical amplifier
Optical fiber
C359S344000
Reexamination Certificate
active
06870667
ABSTRACT:
Optical amplifier according to the present invention is provided with an EDF, a light source device having a semiconductor laser element that generates an excitation beam and a housing that accommodates this, and an optical multiplexer having an input optically coupled with light source device, an input that receives the signal beam, and an output that provides an excitation beam and signal beam to EDF. Semiconductor laser element has an active layer, provided between cladding layers and including compound semiconductors of mutually different conductivity types, that includes a compound semiconductor and is constructed such that the oscillation wavelength at 20° C. of this semiconductor laser element is less than 1470 nm but not less 1440 nm. If this is done, the change of gain in EDF with respect to oscillation wavelength can be made satisfactorily small and the NF can be made satisfactorily small.
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Shah et al. Packaging technology for high-power, singlemode-fiber-pigtailed pump laser modules for Er-doped fiber amplifiers. Electronic Components and Technology Conference 1992 Proceedings, 42nd. May 18, 1992 to May 20, 1992, pp. 842-847.
Murakami Yasunori
Nakazawa Satoru
Hughes Deandra M.
Tarcza Thomas H.
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