Method and apparatus for measuring the noise figure of an optica

Details Method and apparatus for measuring the noise figure of an optica Method and apparatus for measuring the noise figure of an optica

1996-08-13

1998-07-14

Negash, Knife-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359110, 359160, 359337, 359177, H04B 1000

Patent

active

057813221

ABSTRACT:
An optical pulse signal produced by modulating a continuous laser light by means of a first pulse having a period sufficiently shorter than the atomic lifetime in the upper energy state of a rare earth doped fiber is input to an optical amplifier to be measured, while an output signal from the optical amplifier is modulated by a second pulse synchronized with the first pulse and having a phase difference relative to the first pulse which can be optionally set so that rapid phase adjustment relative to the first pulse is possible based on the phase at the time of minimum optical power. The noise figure of the optical amplifier is then measured based on, the maximum photoelectric power (P.sub.AMP +P.sub.ASE) and the minimum photoelectric power P.sub.ASE of the resultant optical signal.

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.

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