Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1992-09-25
1994-08-23
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214A, H01J 4014
Patent
active
053409795
ABSTRACT:
A method for determining the amplified spontaneous emission noise of an optical circuit, such as an optical amplifier, in the presence of an optical signal includes applying a pulsed optical signal of prescribed intensity to an input of an optical circuit under test, and detecting an output signal from the optical circuit slightly after the pulsed optical signal is switched from on to off. The output signal immediately after the optical signal is switched off represents the amplified spontaneous emission noise of the optical circuit in the presence of an optical signal of the prescribed intensity. In a first embodiment, an optical spectrum analyzer is used for detecting the output signal. In a second embodiment, the output signal is passed through a narrow band optical filter to a photodetector. An electrical spectrum analyzer displays the detected waveform. When necessary, the observed output signal is extrapolated to a time immediately after the optical signal is switched off.
REFERENCES:
patent: 4341956 (1982-07-01), Bax
patent: 5088095 (1992-02-01), Zirngibl
patent: 5117196 (1992-05-01), Epworth et al.
Baney Douglas M.
Dupre John J.
Davenport T.
Hewlett--Packard Company
Milks, III William C.
Westin Edward P.
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