Optical amplifier

Details Optical amplifier Optical amplifier

1994-10-14

1996-03-12

Moskowitz, Nelson

Optical: systems and elements

Optical amplifier

Optical fiber

359345, 372 71, H01S 330, G02B 626

Patent

active

054991358

ABSTRACT:
Known optical amplifiers, which are used in a light transmission path to amplify the light signals to be transmitted, have the disadvantage that the semiconductor lasers, used as pump lasers therein, are very sensitive to feedback.
According to the invention, the operating current of such pump lasers (4) is modulated at a high frequency, which causes the pump laser to operate in a multi-mode, thereby making it insensitive to feedback. For example, the operating current is DC, on which AC is superimposed.
In the event the optical amplifier has two pump lasers, their operating current is also modulated. Both pump lasers are then advantageously alternately switched on and off at a sufficiently high switching frequency, which also prevents reciprocal interference.

REFERENCES:
patent: 4847521 (1989-07-01), Huignard et al.
patent: 5054876 (1991-10-01), Grasso et al.
patent: 5229876 (1993-06-01), Fatehi et al.
patent: 5297154 (1994-03-01), Heidemann et al.

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