Apparatus for determining noise factor of optical amplifier

Details Apparatus for determining noise factor of optical amplifier Apparatus for determining noise factor of optical amplifier

1995-10-24

1996-11-12

Hellner, Mark

Optical: systems and elements

Optical amplifier

Correction of deleterious effects

359341, 359110, 359177, H01S 300, H04B 1008, H04B 1002

Patent

active

055745342

ABSTRACT:
A noise determination apparatus for simple and precise determination of a noise factor of an optical fiber amplifier is presented. An optical pulse Pin is inputted via an optical coupler 2 into an optical looping circuit 14, and for every loop around the circuit 14, the spontaneous emission light generated in a rare-earth doped optic fiber amplifier 4 is integrated. The amplitude of the light intensity of the optical pulse train outputted from the optical splitter 3 decreases as the looping cycles are increased, and ultimately, the light intensity of the accumulated spontaneous emission light becomes equal to that of the optical pulse train. The pulse train outputted from the photodetector 7 diminishes. The number of pulses in the looping process from the initial pulse train to the expiration event are counted by means of a pulse counting device 8. Based on the count, the noise factor NF of the optical amplifier 4 is calculated using the gain of the optical amplifier 4, the bandwidth of the bandpass filter 5, oscillation frequency of light and the pulse intensity.

REFERENCES:
patent: 5282074 (1995-01-01), Miyazaki et al.
patent: 5471334 (1995-11-01), Masuda et al.
patent: 5521751 (1996-05-01), Aida et al.

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