Single send-receive optical head for transmission and reception of data by optical system, and associated switching circuit
AssigneeThomson-CSF
InventorsJean-Marc Defranco, Florence Barnabe, Alain Rouzier
Life of this patent
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Abstract
An optical head incorporating a single opto-electronic component and a laser device for transmitting and receiving data on a single optical fiber. The use of a single laser device for both sending and receiving data is made possible by a switching circuit, controlled by two transistors which forward-bias the laser device for transmission and reverse-bias the laser device for reception. Such a device may find particular application to data transmission on an optical path, and particularly between 1 and 10 GHz.
Claims8
A switching circuit for use in conjunction with a semiconductor laser device operating in both send and receive modes, comprising:
- a first diode connected to a first voltage source;
- a laser connected in series to the first diode;
- a second diode connected in series to the laser;
- a third diode connected in series to the second diode and connected to a second voltage source;
- a transmission amplifier having an output connected to a cathode of the third diode;
- a reception amplifier having an input connected to a cathode of the first diode;
- a first control device connected to an anode of the second diode;
- and
- a second control device connected to a cathode of the second diode, wherein the first and second control devices are connected to a third voltage source.
Dependencies are inferred from the claim text.