Optical communication module and optical communication device
First Claim
1. An optical communication module comprising:
- a first semiconductor chip having a laser diode outputting an optical signal being formed on the first semiconductor chip;
a first wiring; and
a second semiconductor chip connected to the first semiconductor chip via the first wiring, and having a driver circuit driving the laser diode by a first current being formed on second semiconductor chip, whereina driver control circuit, detecting a temperature variation of the first semiconductor chip transferred in heat via the first wiring and correcting the magnitude of the first current based on a detection result, is further formed on the second semiconductor chip;
the driver control circuit includes a temperature detecting circuit generating a first voltage increased in proportion to temperature and generates a driver control voltage obtained by adding a predetermined offset voltage to the first voltage;
the driver circuit includes a variable current source generating a current having a magnitude corresponding to the driver control voltage and determining a reference value of the first current; and
the temperature detecting circuit includes;
first and second diodes having mutually different areas,a constant current circuit causing an equal current to flow in the first diode and the second diode, anda first amplifier circuit amplifying a voltage difference between a voltage generated at the first diode and a voltage generated at the second diode so as to output the first voltage.
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Accused Products
Abstract
An optical communication module and an optical communication device including the same are provided. For example, a first semiconductor chip on which a laser diode is formed and a second semiconductor chip on which a laser diode driver circuit, etc. for subjecting the laser diode to drive by current are formed are mounted on a package printed circuit board to be close to each other. Temperature detecting means is further formed on the second semiconductor chip (laser diode driver circuit, etc.). The temperature detecting means detects a temperature variation ΔT of the first semiconductor chip (laser diode) transmitted via a wiring in the package printed circuit board and controls the magnitude of the driving current of the laser diode driver circuit based on a detection result.
22 Citations
13 Claims
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1. An optical communication module comprising:
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a first semiconductor chip having a laser diode outputting an optical signal being formed on the first semiconductor chip; a first wiring; and a second semiconductor chip connected to the first semiconductor chip via the first wiring, and having a driver circuit driving the laser diode by a first current being formed on second semiconductor chip, wherein a driver control circuit, detecting a temperature variation of the first semiconductor chip transferred in heat via the first wiring and correcting the magnitude of the first current based on a detection result, is further formed on the second semiconductor chip; the driver control circuit includes a temperature detecting circuit generating a first voltage increased in proportion to temperature and generates a driver control voltage obtained by adding a predetermined offset voltage to the first voltage; the driver circuit includes a variable current source generating a current having a magnitude corresponding to the driver control voltage and determining a reference value of the first current; and the temperature detecting circuit includes; first and second diodes having mutually different areas, a constant current circuit causing an equal current to flow in the first diode and the second diode, and a first amplifier circuit amplifying a voltage difference between a voltage generated at the first diode and a voltage generated at the second diode so as to output the first voltage. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An optical communication device comprising:
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a first wiring card mounting a first A optical communication connector and a first optical communication module; a second wiring card mounting a second A optical communication connector and a second optical communication module; and a first optical fiber cable connected between the first A optical communication connector and the second A optical communication connector and having a wiring length of several meters or less, wherein the first optical communication module includes a first A semiconductor chip, a first laser diode transmitting a first optical signal to the first A optical communication connector formed on the first A semiconductor chip, a first wiring, and a first B semiconductor chip connected to the first A semiconductor chip via the first wiring; the second optical communication module includes a second A semiconductor chip, first photodiode formed on the second A semiconductor chip, a second B semiconductor chip, and a first transimpedance amplifier circuit, the first photodiode converting the first optical signal received from the second A optical communication connector to an electric signal, and the first transimpedance amplifier circuit amplifying the current signal and converting the signal to a voltage signal; and a first driver circuit driving the first laser diode by a first current, and a first driver control circuit detecting a temperature variation of the first A semiconductor chip transferred in heat via the first wiring and correcting magnitude of the first current based on a detection result are formed on the first B semiconductor chip. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification