Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1991-06-07
1993-03-16
Coles, Sr., Edward L.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359193, H04B 1006
Patent
active
051949792
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.
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Koai Kwang-Tsai
Olshansky Robert
Coles Sr. Edward L.
GTE Laboratories Incorporated
Monks Lawrence E.
Pascal Leslie
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