Method and apparatus for optical amplifier gain and noise figure

Details Method and apparatus for optical amplifier gain and noise figure Method and apparatus for optical amplifier gain and noise figure

1996-07-08

2000-01-18

Hofsass, Jeffery A.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359337, 359341, H04B 1002

Patent

active

060162139

ABSTRACT:
An improved method of measurement of noise figure and gain of optical amplifiers is based on transforming the amplifier into an oscillator by applying optical feedback with known loss. The feedback consists of a tunable filter for wavelength control and of a variable attenuator for gain control. Measuring the output power at a given wavelength and the noise characteristics of the output signal, either with an optical spectrum analyzer or with a set of tunable filters and a power meter, provides data for full characterization of the optical amplifier. Another method is disclosed that utilizes the self-heterodyne setup and electrical spectrum analyzer to measure the spectral line width of the lasing amplifier, from which the noise figure is derived.

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