Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1995-02-28
1997-09-16
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Optical fiber
359173, 359179, H04B 1000, H01S 300
Patent
active
056686587
ABSTRACT:
A multi-repeater optical transmission system comprises a plurality of repeaters which are respectively provided with oscillators for generating oscillation waves of different frequencies. The respective oscillation waves are frequency-modulated according to repeater information signals respectively generated in the repeaters. According to the frequency-modulated oscillation waves, respective pumping sources are operated to emit pumping lightwaves for pumping Er-doped fiber amplifiers. The respective pumping lightwaves carrying the repeater information signals are sent out to a transmission line through a wavelength division multiplexing fiber coupler.
REFERENCES:
patent: 5229876 (1993-07-01), Fatehi et al.
patent: 5436750 (1995-07-01), Kawano
S. Matsuoka et al., "Supervisory Signal Transmission Methods For Optical Amplifier Repeater Systems", IEEE 1990, pp. 1846-1850.
Y. Sato et al., "Optical Time Domain Reflectometry in Optical Transmission Lines Containing In-Line Er-Doped Fiber Amplifiers", Journal of Lightwave Technology, vol. 10, No. 1, Jan. 1992, pp. 78-83.
Moskowitz Nelson
NEC Corporation
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