Optical transmission system for performing communication...

Details Optical transmission system for performing communication... Optical transmission system for performing communication...

2007-06-26

2007-06-26

Vanderpuye, Kenneth (Department: 2613)

Optical communications

Multiplex

Subcarrier multiplexing

C398S075000, C398S140000

Reexamination Certificate

active

10648428

ABSTRACT:
The present invention provides a low-cost optical transmission system using a plurality of subscriber lines which is capable of efficiently utilizing an optical transmission path. A communication status observing section116in a transmitting device1classifies subscribers into a plurality of groups based on a communication status at each subscriber end, and outputs constellation level information and level information which are different for each group. For each constant cycle, a modulation control section117and a gain control section118respectively set a QAM constellation level and a signal level which are different for each group and used in a basic modulating section103.

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