Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1998-03-27
2000-01-11
Hellner, Mark
Optical: systems and elements
Optical amplifier
Optical fiber
359133, H01S 300, H04J 1402
Patent
active
060142480
ABSTRACT:
A wavelength division multiplexed (WDM) optical signal amplifier which amplifies optical signals having different wavelengths with minimized deviations in their respective output power levels, while maintaining the total optical output at a constant power level. An optical splitter, disposed at the output of the amplifier, splits off a fraction of the amplified WDM optical output signal for feedback purposes. This WDM optical feedback signal is subjected to a wavelength division demultiplexer, where the optical components contained in the signal are demultiplexed into separate optical feedback signals each having a different wavelength. A plurality of optical power level detectors detect the optical power levels of the individual optical feedback signals. Based on the detected optical power levels, a controller adjusts the individual output power levels of the plurality of electrical-to-optical converters, so that the optical power levels detected by the optical power level detectors will coincide with each other.
REFERENCES:
patent: 5305134 (1994-04-01), Tsushima et al.
patent: 5923450 (1999-07-01), Dugan et al.
patent: 5933552 (1999-08-01), Fukushima et al.
Inagaki Shinya
Kobayashi Taiki
Okiyama Tadashi
Fujitsu Limited
Hellner Mark
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