Wideband optical amplifier-receiver system
First Claim
1. An optical amplifier receiver system comprising:
- a semiconductor optical amplifier including an optical input for receiving an optical signal comprising an optical carrier modulated with a modulation signal, an optical output for providing an amplified optical signal, and a current injection electrode;
a bias current source connected to the current injection electrode of said optical amplifier for supplying a bias current to said optical amplifier;
a detection circuit for receiving said modulation signal, said detection circuit having a characteristic input impedance; and
an impedance transformer for coupling said modulation signal from the current injection electrode of said optical amplifier to the input of said detection circuit, said impedance transformer having an input impedance that is lower than the characteristic input impedance of said detection circuit.
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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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Citations
27 Claims
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1. An optical amplifier receiver system comprising:
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a semiconductor optical amplifier including an optical input for receiving an optical signal comprising an optical carrier modulated with a modulation signal, an optical output for providing an amplified optical signal, and a current injection electrode; a bias current source connected to the current injection electrode of said optical amplifier for supplying a bias current to said optical amplifier; a detection circuit for receiving said modulation signal, said detection circuit having a characteristic input impedance; and an impedance transformer for coupling said modulation signal from the current injection electrode of said optical amplifier to the input of said detection circuit, said impedance transformer having an input impedance that is lower than the characteristic input impedance of said detection circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An optical amplifier receiver system comprising:
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a semiconductor optical amplifier including an optical input for receiving an optical signal, an optical output for providing an amplified optical signal, and a current injection electrode, said optical amplifier providing an electrical signal on said current injection electrode in response to said optical signal; a bias current source connected to the current injection electrode of said optical amplifier for supplying a bias current to said optical amplifier; a detection circuit; and an impedance transformer for coupling said electrical signal from the current injection electrode of said optical amplifier to the input of said detection circuit, said impedance transformer having an input impedance that does not exceed 10 times Rj +Rs, where Rj is the junction resistance of said optical amplifier and Rs is the series resistance of said optical amplifier. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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Specification