Optical transmitter with a least pair of semiconductor laser diodes
First Claim
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1. An optical transmitter, comprising:
- a first laser diode having an anode and a cathode;
a first driver connected to the anode of the first laser diode, the first driver receiving a first driving signal;
a second laser diode having an anode and a cathode, the anode of the second laser diode being connected in serial to the cathode of the first laser diode;
a second driver connected to the cathode of the second laser diode, the second driver receiving a second driving signal different from the first driving signal;
an impedance device connected between the anode of the first laser diode and the cathode of the second laser diode; and
a compensating circuit connected to the cathode of the first laser diode and the anode of the second laser diode,wherein the impedance device, the first laser diode, and the second laser diode form a closed loop and have an impedance substantially the same with respect to each other, andwherein the first laser diode is driven only by the first driving signal independently of the second driving signal and the second laser diode is driven only by the second driving signal independently of the first driving signal.
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Abstract
The present invention is to provide an optical transmitter with reduced power consumption. The optical transmitter includes two laser diodes connected in series to each other, one of which is connected in the anode thereof to the first driver, while the other of which is connected in the cathode thereof to the second driver. Further, between the anode of the first laser diode and the cathode of the second laser diode connects an impedance device. In the present invention, the first and second laser diodes, and the impedance device have the substantially same impedance to each other within a concerned frequency range.
14 Citations
5 Claims
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1. An optical transmitter, comprising:
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a first laser diode having an anode and a cathode; a first driver connected to the anode of the first laser diode, the first driver receiving a first driving signal; a second laser diode having an anode and a cathode, the anode of the second laser diode being connected in serial to the cathode of the first laser diode; a second driver connected to the cathode of the second laser diode, the second driver receiving a second driving signal different from the first driving signal; an impedance device connected between the anode of the first laser diode and the cathode of the second laser diode; and a compensating circuit connected to the cathode of the first laser diode and the anode of the second laser diode, wherein the impedance device, the first laser diode, and the second laser diode form a closed loop and have an impedance substantially the same with respect to each other, and wherein the first laser diode is driven only by the first driving signal independently of the second driving signal and the second laser diode is driven only by the second driving signal independently of the first driving signal. - View Dependent Claims (2, 3, 4, 5)
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Specification