Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2007-04-17
2007-04-17
Sedighian, M. R. (Department: 2633)
Optical communications
Multiplex
Wavelength division or frequency division
C398S097000, C398S158000, C398S160000, C398S177000, C359S337120, C359S341410, C359S341420
Reexamination Certificate
active
10835381
ABSTRACT:
A method of controlling an optical wavelength division multiplexing transmission apparatus achieves stable wavelength division multiplexing optical transmission by switching a control mode of an optical amplification section in accordance with an input state of optical signals of various wavelengths. Accordingly, the method involves, upon startup of the optical wavelength division multiplexing transmission apparatus, initial setting of information such as the wavelengths being used and the number of wavelengths being used, setting the amount of optical attenuation for each wavelength to a maximum value, and setting an optical amplification unit to ALC. Then, upon input of an optical signal corresponding to the wavelengths being used, the amount of optical attenuation corresponding to the input optical wavelength is controlled so that the levels of the input optical signals analyzed by the spectral analysis unit are approximately constant; and moreover, so that the input optical level per single wavelength input into the optical amplification unit is of a level which corresponds with the number of wavelengths being used. Then the apparatus shifts to normal operating conditions. Next, when the number of wavelengths being input varies, the optical amplifier is switched to AGC, and after the power level of the optical signal of each wavelength is adjusted, the optical amplifier is switched to ALC again.
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U.S. Appl. No. 09/419,872, filed Oct. 19, 1999, Kawaguchi.
Kawaguchi Akihisa
Minamimoto Kazuhiro
Touma Eisaku
Fujitsu Limited
Sedighian M. R.
Staas & Halsey , LLP
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