Optical: systems and elements – Optical amplifier – Correction of deleterious effects
Patent
1996-03-13
1997-07-01
Hellner, Mark
Optical: systems and elements
Optical amplifier
Correction of deleterious effects
359341, 359133, 359177, H01S 300
Patent
active
056444230
ABSTRACT:
In an optical amplifying device, an optical direct amplifier (11) amplifies input optical signals subjected to wavelength division multiplexing (WDM). A beam splitter (12) splits the amplified WDM signals into two. An optical filter (13A) separates a particular optical signal from one of the two outputs of the beam splitter (12). An optoelectrical converter (14) converts the separated optical signal to a corresponding electric signal. A gain controller (15) controls the gain of the direct amplifier (11) on the basis of the electric signal output from the converter (14). The optical filter 13A may be replaced with an optical variable filter (13B) and controlled by control means when the optical signal for gain control is shut off or sharply varied in wavelength. Because the gain of the direct amplifier (14) is controlled by use of particular one of the plurality of WDM signals, the individual optical signal is controlled to a preselected level even when the number of WDM signals is changed.
REFERENCES:
patent: 5268786 (1993-12-01), Matsushita et al.
patent: 5396360 (1995-03-01), Majima
patent: 5502810 (1996-03-01), Watanabe
patent: 5539570 (1996-07-01), Ushirozawa
Patent Abstracts of Japan, vol. 95, No. 006, & JP-A-07 154368, Jun. 16, 1995.
Hellner Mark
NEC Corporation
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