Method and apparatus for monitoring noise figure of optical ampl

Details Method and apparatus for monitoring noise figure of optical ampl Method and apparatus for monitoring noise figure of optical ampl

1993-10-19

1995-11-28

Williams, Hezron E.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359176, H04B 1700

Patent

active

054713340

ABSTRACT:
A method and an apparatus for monitoring the noise figure of an optical amplifier such as used in linear repeaters in an optical transmission system formed by cascaded linear repeaters. The apparatus includes at least one optical amplifier for amplifying input signal light and a narrow bandwidth optical filter for removing amplified spontaneous emission (ASE) light generated at the optical amplifier. A gain detector is provided to detect the gain of the optical amplifier and an ASE optical power detector detects an optical power of the ASE light generated at the optical amplifier. The apparatus includes a splitter for splitting light entering into the narrow bandwidth optical filter and a local oscillator for generating local light having a wavelength displaced from a wavelength of the input signal light. The light split by the splitter is coupled with the local light generated by the local oscillator. An optical power detector makes a heterodyne detection of the optical power of the coupled light. An electrical band-pass filter extracts the optical power of the ASE light generated by the optical amplifier from the optical power obtained by the optical power detector. A noise figure calculator calculates the noise figure according to the gain detected by the gain detector and the optical power of the ASE light detected by the ASE optical power detector.

REFERENCES:
European Search Report dated Feb. 11, 1994 1990 Technical Digest Series, Optical Amplifiers and their Applications, vol. 13, 6 Sep. 1990, Monterey, Calif., US, pp. 134-137.
Patent Abstracts of Japan, vol. 16, No. 500 dated 15 Oct. 1991 & JP-A-04 181 210 (Fujitsu).
Electronics Letters, vol. 27, No. 9 dated 25 Apr. 1991, Stevenage GB.
OFC '92, Technical Digest, Optical Fibert Communication Conference Article.

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