Broadband optical communication system, particularly in the subscriber area

US4955014A · kind A · utility

Assignee

• Alcatel N.V. · NL

Inventors

• Dieter Kuppers · Aachen, DE
• Klaus Herse · Weil der Stadt, DE
• Kate Hiepe-Wohlleben · Leonberg, DE
• Manfred Kaiser · Karben, DE
• Friedemann Mohr · Renningen, DE
• Horst Ohnsorge · Freiberg, DE

Key dates

• Filing date: Oct 30, 1987
• Grant date: Sep 4, 1990
• Expiry date: Oct 30, 2007

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04Q11/0001
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

For short-distance communication systems, particularly for optical-waveguide links in the subscriber area, it is proposed to operate the standard single-mode optical waveguide for long-distance applications, which is optimized for the wavelength range from 1300 nm to 1600 nm, with optical transmitters and optical receivers whose operating wavelengths lie clearly below the cutoff wavelength of the optical waveguide. By means of a suitable stable laser-waveguide coupling, it is ensured that single-mode operation is achieved, which is necessary to transmit digital signals at high bit rates. The increased loss of the optical waveguide at 800 nm can be accepted because of the relatively short length of subscriber lines. Both unidirectional and bidirectional transmission over a single optical waveguide using wavelength-division or modal multiplexing is possible.