Access node for optical networks with variable-access...

Optical communications – Multiplex – Wavelength division or frequency division

Reexamination Certificate

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C398S079000, C398S059000, C398S082000, C398S083000, C398S009000, C398S045000, C398S050000, C398S048000, C398S091000, C398S100000, C398S056000, C398S058000, C398S182000, C398S183000, C398S078000

Reexamination Certificate

active

07013086

ABSTRACT:
The access node for optical networks with variable access wavelengths can be connected to user devices via respective first optical conductors and can be connected to the optical network via second optical conductors. The novel access node has light sources which emit at the wavelengths defined in the optical network. The light of the light sources can be modulated in the user devices. This prevents that in each case a light source which must be able to emit light of a different wavelength in a dynamic optical network or the wavelengths of which must be subsequently converted must be arranged in the individual user devices. In addition, it also prevents circuit boards leading to a high logistical expenditure having to be provided in the user devices. Accordingly, according to the invention, it is possible to construct the individual user devices without light sources. This considerably simplifies their construction and the method of use.

REFERENCES:
patent: 5717795 (1998-02-01), Sharma et al.
patent: 5870216 (1999-02-01), Brock et al.
patent: 6137613 (2000-10-01), Ushirozawa
patent: 6275511 (2001-08-01), Pan et al.
patent: 6285479 (2001-09-01), Okazaki et al.
patent: 6535313 (2003-03-01), Fatehi et al.
patent: 6626590 (2003-09-01), Nagatsu et al.

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