Optical transmitter with EA-modulator
AssigneeSumitomo Electric Industries, Ltd.
InventorKengo Matsumoto
Life of this patent
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Abstract
The present invention is to provide an optical transmitter that includes an EA-modulator and has a function to monitor the optical output power from the EA-modulator with a simplified and small-sized circuit. The transmitter provides a semiconductor optical device integrating a laser diode with the EA-modulator, a driver, and a termination resistor. One terminal of the resistor is connected to the anode of the EA-modulator, while, the other terminal of the resistor is grounded in the AC mode. The driver is coupled in the AC mode with the terminal of the resistor and the anode of the EA-modulator via a capacitor to provide a modulation signal to the modulator. The EA-modulator is reversely biased through the resistor.
Claims3
An optical transmitter, comprising:
- a semiconductor optical device that builds a semiconductor laser diode integrally with a semiconductor modulator with an electro-absorption type, a cathode of the laser diode and a cathode of the modulator commonly connected;
- a termination resistor with first and second terminals, the first terminal being connected to an anode of the modulator and the second terminal being connected to the cathode of the laser diode in an AC mode;
- a driver connected to the anode of the modulator in the AC mode to provide a modulation signal to the modulator;
- and
- a bias source connected to the second terminal of the resistor,
- wherein the modulator is reversely biased by the bias source through the resistor.
Dependencies are inferred from the claim text.