Method and apparatus to compensate for distortion in optical tra

Details Method and apparatus to compensate for distortion in optical tra Method and apparatus to compensate for distortion in optical tra

1991-11-05

1993-09-07

Davie, James W.

Coherent light generators

Particular beam control device

Modulation

372 33, 372 38, H01S 310

Patent

active

052436136

ABSTRACT:
An electrical compensation circuit and an optical compensation circuit are provided for compensating for expansion-type and compression-type gain distortion due to the interaction of a laser and an optical amplifier. In the electrical compensation circuit there is provided a linear signal path and a nonlinear signal path. A delay circuit in the linear signal path compensates for a signal delay in the nonlinear signal path. In the nonlinear signal path there is provided an FET and a transformer. A modulation signal applied to the linear signal path and the nonlinear signal path is processed in the nonlinear signal path and combined with the signal in the linear signal path so as to provide a predistorted modulation signal which is substantially equal in amplitude and opposite in phase to the gain distortion in the optical signal at the output of the optical amplifier. In the optical compensation circuit there is provided a predetermined length of erbium-doped fiber which is inserted between a laser and an erbium-doped fiber amplifier (EDFA) so as to provide an absorption of the output of the laser which is equal in magnitude and opposite in phase to the gain distortion in the output signal of an uncompensated EDFA.

REFERENCES:
patent: 5119392 (1992-06-01), Childs
Article: Optical Amplifiers and Their Applications, C. Y. Kuo and E. E. Bergmann, Jul. 24-26, 1991, IEEE/Lasers and Electro-Optics Society, Optical Society of America.

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