Optical transmission system for the subscriber connection area with optical amplifiers

Abstract

Abstract The system according to the invention serves to distribute communication signals, in particular television signals, from a central station to a multiplicity of subscribers and to enable two-way transmission of telephone and data signals between the central station and the subscribers. According to the invention, the network used for this purpose is an optical waveguide network with a star-star structure in which fibre-optic amplifiers (10, 11) are provided between successive branching points. The communication signals to be distributed are transmitted via the optical waveguide network on a first wavelength ( lambda 1) to the subscribers, the subscriber-individual communication signals to be transmitted from the central station (1) to the subscribers (Ti) are converted by frequency modulation to a frequency band (FB2) which differs from that of the distribution signals (by frequency modulation) and are transmitted on the same wavelength as that of the distribution signals to the subscribers, and the subscriber-individual signals to be transmitted from the subscribers (Ti) to the central station (1) are converted by frequency modulation to a further frequency band (FB3) and transmitted optically on a second wavelength ( lambda 2) to the central station. This optical signal is amplified at suitable points (A), and a plurality of alternative embodiments for this amplification are indicated. <IMAGE>

Inventors

• 👤 Horst Dr. Ohnsorge
• 👤 Rolf Dr. Heidemann
• 👤 Adolf Weygang

Bibliographic Details