Method and device for measuring a noise figure in optical amplif

Details Method and device for measuring a noise figure in optical amplif Method and device for measuring a noise figure in optical amplif

1996-01-29

1997-10-14

Chin, Wellington

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359177, 359341, H04B 1016

Patent

active

056777817

ABSTRACT:
A method and device for automatically and accurately measuring a noise figure of an optical amplifier are disclosed. In the method, light pulses which have different wavelengths .lambda..sub.1 .about..lambda..sub.n and have a period shorter than a time constant of extinction of the optical amplifier are generated. The light pulses thus generate are supplied to the optical amplifier. Powers P.sub.AMP1 .about.P.sub.AMPn of amplified lights outputted from the optical amplifier which correspond to the light pulses and have the wavelength .lambda..sub.1 .about..lambda..sub.n and powers P.sub.ASE1 .about.P.sub.ASEn of lights which have the wavelength .lambda..sub.1 .about..lambda..sub.n and are outputted from the optical amplifier when the amplified lights are not outputted from the optical amplifier are measured. Noise figures NF.sub.1 .about.NF.sub.n at the wavelengths .lambda..sub.1 .about..lambda..sub.n the optical amplifier are calculated according to the following equation.

REFERENCES:
patent: 5471334 (1995-11-01), Masuda et al.
patent: 5521751 (1996-05-01), Aida et al.
patent: 5561551 (1996-10-01), Iwasaki et al.
patent: 5574534 (1996-11-01), Nogiwa et al.
patent: 5600481 (1997-02-01), Nakabayashi

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