Modular electro-optic bus coupler system

• US 5,202,940 A
• Filed: 02/06/1992
• Issued: 04/13/1993
• Est. Priority Date: 02/13/1991
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Betts, Robert
• Primary Examiner(s): Ullah, Akm E.
• Application Number:
  US07/832,194
• Time in Patent Office: 432 Days
• Field of Search: 455/601, 455/610, 385/24, 385/25, 370/16, 370/58
• US Class Current: 385/24
• CPC Class Codes: H04B 10/801 using optical interconnects, e.g. light coupled isolators, circuit board interconnections

Abstract

The electrical/optical modular coupler enables terminal units coupled to it to be interconnected over the optical and/or electrical bus by which they are physically intercoupled. The modular coupler unit will have a plurality of modular active fiber optic coupler units; each modular active fiber optic coupler unit having an optical input port; an optical output port; an optical transmitter coupled to said optical output port; an optical receiver coupled to said optical input port, an electrical input port; an electrical output port; and logic control elements coupling the said optical transmitter, said optical receiver, said electrical output port and said electrical input port coupled for preventing any electrical input signal on said electrical input port from appearing at the electrical output port; but allowing an electrical input signal to be transmitted as an optical output signal and an electrical input signal to be transmitted as an optical output signal and allowing an optical input signal to become an electrical output; and the system has the electrical output ports of a modular coupler unit of the system coupled to the electrical input ports of a plurality of other couplers, and it the system may be coupled to an unlimited maximum of couplers with an optical signal appearing at any coupler input becoming an electrical signal output at that coupler and consequently becomes an electrical input at all of the other interconnected plurality of modular active fiber optic coupler units.

Claims

1. A coupler for connecting terminals to an electrical bus, said terminals being coupled by an optical bus, said coupler comprising:

optical input ports;

optical output ports;

an optical transmitter coupled to one of said optical input ports;

an optical receiver coupled to one of said optical output ports;

an electrical input port;

an electrical output port;

logic control means coupling said optical transmitter, said optical receiver, said electrical output port and said electrical input port for preventing any electrical input signal on said electrical input port from appearing at the electrical output port, but allowing an electrical input signal to be transmitted as an optical output signal and allowing an optical input signal to become an electrical output and an optical output; and

means physically configured for plugging into said electrical bus so as to couple said terminals to said electrical bus for optical-electrical bus-to-bus transmissions.

2. A coupler according to claim 1 wherein any optical input becomes both an optical output and an electrical output, and any electrical input becomes an optical output but does NOT become an electrical output.

3. A coupler according to claim 1 wherein said logic control means includes an OR gate coupled to receive signals via said electrical input port, and an AND gate coupled to said electrical output port for transmitting via said electrical output port an electrical signal, and internal electrical logic means for overlapping signals at the input to the AND gate such that said internal electrical logic means blocks any electrical signal from becoming an electrical output signal, while permitting an electrical input signal to be converted to an optical output signal by said optical transmitter for transmission via said optical output port.

4. A coupler according to claim 1 wherein a logic delay line means provided for said logic control means blocks any electrical input signal from becoming an electrical output signal, while permitting an electrical input signal to be converted to an optical output signal by said optical transmitter for transmission via said optical output port.

5. A coupler according to claim 3 wherein delay means are provided for said logic control means whereby the delay from said OR gate through the transmitter to said receiver and to the coupled AND gate is greater than the electrical delay from the OR gate to the AND gate through the electrical delay means, and wherein the timing of the optical delay less the electrical delay is less than or equal to the maximum time between signal transitions.