In-line two-stage erbium doped fiber amplifier system with in-ba

Details In-line two-stage erbium doped fiber amplifier system with in-ba In-line two-stage erbium doped fiber amplifier system with in-ba

1995-01-03

1996-01-02

Moskowitz, Nelson

Optical: systems and elements

Optical amplifier

Optical fiber

359177, H01S 317, H01S 306, H04B 1000

Patent

active

054813999

ABSTRACT:
The present invention is an in-line multi-stage erbium doped fiber amplifier system for use in fiber optic communication systems. The system comprises two cascaded erbium doped fiber amplifiers (12), (14) separated by an drop/add device (20) for filtering out the amplifier spontaneous emission noise and the existing telemetry channel and for adding a new telemetry channel before the second amplifier (14). The invention also provides a method for providing a telemetry signal to in-line erbium doped fiber amplifier sites without affecting the signal capacity of the system, and also provides a method for monitoring the performance of a link in an optical fiber communication system.

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Babsour et al, Proc. SPIE, vol. 1789, pp. 260-267, Sep. 11, 1992, Mtg.
Nakazawa, M.; Jour. of Appl. Phys. Japan, vol. 59, #9, 1990, pp. 1175-1191.
IEEE Photonics Technology Letters, vol. 5, No. 7, Jul. 1993, New York US pp. 773-775, A. Yu et al. "Analysis of Optical Gain Enhanced Erbium-Doped Fiber Amplifiers Using Optical Filters".

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