Modular active fiber optic coupler system

• US 5,185,833 A
• Filed: 09/06/1991
• Issued: 02/09/1993
• 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:
  US07/755,724
• Time in Patent Office: 522 Days
• Field of Search: 385/24, 385/46, 359/120, 359/121, 359/140
• US Class Current: 385/46
• CPC Class Codes: H04B 10/801 using optical interconnects, e.g. light coupled isolators, circuit board interconnections

Abstract

A modular active fiber optic coupler unit system comprising: 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 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 pluarlity 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 modular active fiber optic coupler unit comprising:

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;

interconnection means for interconecting the coupler unit to multiple coupler units including an electrical input port having a plurality of input lines coupled to a logic control means including a selection gate device coupled to said electrical input port; and

a single electrical output port for passing a terminal device addressed signal out of said coupler unit; and

said logic control means coupling the 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.

2. An modular active fiber optic coupler unit according to claim 1 wherein said logic control means includes said selection gate device having an OR gate and coupling means for receiving 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 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.

3. A modular active fiber optic coupler unit according to claim 1 further comprising logic delay line means for blocking 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 modular active fiber optic coupler unit according to claim 2 further comprising delay means for causing a signal delay from said OR gate through the transmitter to said receiver and to the coupled AND gate to be 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.

5. A modular active fiber optic coupler unit comprising:

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 means coupling the 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;

said logic control means including 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 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.

6. A modular active fiber optic coupler unit according to claim 5 wherein a logic delay line means provided for said logic control 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.

7. A modular active fiber optic coupler unit comprising:

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 means coupling the 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;

said logic control means including 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 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; and

delay means for said logic control means for controlling delay 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.

8. A modular active fiber optic coupler unit comprising:

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 means coupling the 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;

said logic control means including 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 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; and

having

logic delay line means provided for said logic control means for blocking 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.