Optical coupler module in a distributed processing system

• US 4,234,968 A
• Filed: 09/05/1978
• Issued: 11/18/1980
• Est. Priority Date: 09/05/1978
• Status: Expired due to Term

• Current Assignee: NCR Corporation
• Original Assignee: NCR Corporation
• Inventors: Singh, Amar J.
• Primary Examiner(s): Ruggiero, Joseph F.
• Application Number:
  US05/939,726
• Time in Patent Office: 805 Days
• Field of Search: 364/200 MS File, 364/900 MS File, 250/199, 324/96, 324/97, 350/96.15, 350/96.16, 350/96.1, 350/96.17, 350/96.2, 350/96.23, 350/96.3, 455/606, 455/607, 358/901
• US Class Current: 398/61
• CPC Class Codes: H04B 10/27 Arrangements for networking

Abstract

An optically linked distributed data processing system having a plurality of stations and first and second transmission lines associated with each station. The first transmission line carries optical signals to its associated station and the second transmission line carries optical signals from its associated station. An active optical coupler module couples each first transmission line to every second transmission line. The coupler module includes a tapered waveguide for directing the optical signals from each of the first transmission lines to a single optical path, an optical detector for converting the optical signals to electrical signals, an amplifier for amplifying the electrical signals. In one embodiment a single optical source converts the amplified electrical signals back to optical signals, and in a second embodiment a plurality of optical sources, one for each of the second transmission lines, convert the amplified electrical signals back to optical signals.

Claims

1. An optical coupler for a distributed data processing system having a plurality of stations, a first transmission line from an optical source in each of said stations, and a second transmission line to an optical detector in each of said stations, the coupler comprising:

optical waveguide means for receiving optical signals from any said first transmission line and directing the optical signals to a single optical path;

means for amplifying the optical signals on the single optical path, including optical detector means for converting the optical signals on the single optical path to electrical signals, electrical amplifying means for amplifying the electrical signals from said optical detector means, and optical source means for converting the amplified electrical signals to optical signals, said optical source means including an optical source driver; and

means for distributing the amplified optical signals to each said second transmission line, including a waveguide interface for receiving the optical signals from said optical source means at one end face and having an opposite end face cooperating with a plurality of waveguide segments to provide the optical signals received at the one end face to each of the waveguide segments, one of the waveguide segments providing a feedback signal to said optical source driver, and each of the other waveguide segments providing the optical signals from the waveguide interface to an associated second transmission line.

2. The coupler of claim 1 wherein said optical waveguide means for receiving the optical signals from any said first transmission line comprises a tapered waveguide having a larger end face for receiving the optical signals from each said first transmission line and an opposite, smaller end face defining the single optical path.