Photoperiodic circuit amplification control apparatus

Details Photoperiodic circuit amplification control apparatus Photoperiodic circuit amplification control apparatus

1995-04-06

1996-02-27

Hellner, Mark

Optical: systems and elements

Optical amplifier

359341, 359107, H01S 300

Patent

active

054953626

ABSTRACT:
The object of the present invention is to control the amplification rate of a photoperiodic circuit by stable negative feedback control, thereby suppressing fluctuations in the circulating light in the photoperiodic circuit. The circulating light in the photoperiodic circuit is converted into an electrical signal, indicating the intensity of the circulating light, which is held in a first sample-and-hold circuit. Additionally, an electrical signal indicating the intensity of circulating light of the circuit previous to that of the first sample-and-hold circuit is held in a second sample-and-hold circuit. The difference in the value between the electrical signals which indicate intensities of the circulating light are determined by a subtraction circuit. The result is supplied to an addition circuit through a third sample-and-hold circuit. The addition circuit adds the output of the third sample-and-hold circuit with the output of a standard electrical power source, and the result is supplied to an excitation light source. The excitation light source supplies excitation light, having an intensity dependent upon the above-mentioned addition result, to a rare-earth-doped fiber.

REFERENCES:
patent: 4738503 (1988-04-01), Desurvire et al.
patent: 4923266 (1990-05-01), Bovet et al.
patent: 5155779 (1992-10-01), Avramopoulos et al.
patent: 5268786 (1993-12-01), Matsushita et al.
patent: 5291326 (1994-03-01), Heidemann
patent: 5374973 (1994-12-01), Maxham et al.

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