Wideband optical amplifier-receiver utilizing two electrode opti

Details Wideband optical amplifier-receiver utilizing two electrode opti Wideband optical amplifier-receiver utilizing two electrode opti

1991-06-06

1993-02-09

Epps, Georgia Y.

Coherent light generators

Particular active media

Semiconductor

372 32, 372 31, 372 29, 372 28, H01S 319, H01S 3096

Patent

active

051857561

ABSTRACT:
A semiconductor optical amplifier is utilized for optical amplification and for detection of an optical signal at the current injection electrode of the optical amplifier. A wide detection bandwidth is provided by utilizing an impedance transformer between the current injection terminal and the detection circuit. The impedance transformer typically has an input impedance of about 1 to 15 ohms. The impedance transformer can be a bipolar junction transistor circuit, a microstrip transmission line impedance transformer or a hybrid impedance transformer. A wide detection bandwidth is also obtained by providing a semiconductor optical amplifier having two current injection electrodes. A bias current is supplied through both current injection electrodes, and both electrodes produce optical gain. However, only one of the electrodes is used for optical signal detection. The detection electrode has a relatively high junction resistance and a relatively high series resistance.

REFERENCES:
patent: 4669086 (1987-05-01), Kaede et al.
patent: 4713821 (1987-12-01), Bradford et al.
patent: 4744089 (1988-05-01), Montroll et al.
patent: 5014280 (1991-05-01), Sanada et al.

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