Erbium-doped fiber amplifier with automatic gain control

Details Erbium-doped fiber amplifier with automatic gain control Erbium-doped fiber amplifier with automatic gain control

1997-10-07

1999-12-28

Moskowitz, Nelson

Optical: systems and elements

Optical amplifier

Correction of deleterious effects

359341, 359346, 372 18, 372 29, H01S 330, G02B 626

Patent

active

060089326

ABSTRACT:
An Erbium doped fiber amplifier (EDFA) is placed in a laser cavity to clamp the gain of the amplifier. The laser cavity is preferably formed to minimize the effects of relaxation oscillations and of spectral hole burning. In a preferred embodiment, the laser cavity supports a lasing wavelength which makes the saturation energy at the laser wavelength less than that at the signal wavelengths. In an erbium doped fiber implementation, the laser wavelength is shorter than that of the signal wavelengths and is separated from them by no more than approximately 75% of the width of the spectral hole. The compounding of relaxation oscillations may be substantially eliminated by varying the length of the fiber within each laser cavity within a system to change the photon round-trip time within each cavity.

REFERENCES:
patent: 5239607 (1993-08-01), da Silva et al.
patent: 5633964 (1997-05-01), DiGiovanni et al.
Sirvastava et al, OFC'96, vol. 2, Tech. Digest, pp. 33-34, Mar. 1, 1996; abst. only herewith.
A.K. Srivastava et al. Optical Fiber Communications Conference, vol. 2, OSA Technical Digest Series (Optical Society of America, Washington, D.C.), 1996, pp. 33-34.
Robert G. Winch, "Telecommunication Transmission Systems", McGraw Hill, 1993, pp. 335-337.
Robert G. Winch, "Telecommunication Transmission Systems", McGraw Hill, 1993, pp. 355-374.

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