Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-06-04
2000-02-29
Negash, Kinfe-Michael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359134, 359341, H04B 1000
Patent
active
060316462
ABSTRACT:
The present invention relates to an optical fiber telecommunications system and more in particular to an optical telecommunications system having a high loss transmission line. The optical fiber telecommunications system includes a transmission station producing at least one transmission signal in a predetermined wavelength band carrying the information, a receiving station for receiving said transmission optical signal, an optical fiber line connecting the transmission station and the receiving station, and at least one optical fiber amplifier connected along the line for amplifying the transmission optical signal, the amplifier having a total optical output power greater than 20 dBm. The fiber optic amplifier for amplifying a transmission signal including a first stage and a second stage, an isolator placed between the first stage and the second stage where the second stage includes an erbium doped fiber, pump means including two pump sources at different wavelengths in a second stage pump wavelength band, A WDM coupling means coupling the different wavelengths as a composite second stage pump signal, and a coupler coupling the composite second stage pump signal and the transmission optical signal to the erbium doped fiber.
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P. Wysocki et al., "Dual-stage erium-doped, erbium/ytterbium-codoped fiber amplifier with up to +26-dBm output power and a 17-nm flat spectrum", Optics Letters, 21(21):1744-1746 (1996).
Y. Tahura et al., "Semiconductor Laser Pump Module with 240mW Output around 1.47 .mu.m Band", IOOC'89, Kobe, Japan, p. 82-83 (1989).
Negash Kinfe-Michael
Pirelli Cavi E Sistemi S.p.A.
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