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US 5,179,461 AGranted
Broadband optical receiver with passiner tuning network
AssigneeOrtel Corporation
InventorsHenery A. Blauvelt, Israel Ury, David B. Huff, Howard L. Loboda
Life of this patent
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Abstract
This optical receiver is capable of receiving broadband R-F modulated signals transmitted over fiber-optic cable. The receiver comprises a photodiode impedance matched to the input of an low noise, low distortion amplifier by an impedance matching transformer. A passive tuning network is placed between the photodiode and the transformer to improve the high frequency performance of the receiver. Distortion of the optical receiver is further reduced by cancelling even power distortion products from out of phase signals generated by the photodiode.
Claims35
A broadband R-F optical receiver comprising:
- a photodetector having an output with an impedance for converting a broadband R-F optical signal to a broadband R-F electrical signal;
- means having an input with an impedance lower relative to the photodetector impedance for amplifying the electrical signal from the photodetector;
- means for connecting and matching the impedance of the output of the photodetector with the input impedance of the amplifying means, the impedance matching means being a transformer having an input connected to the photodetector and an output connected to the amplifying means;
- and
- means for supplying a bias voltage to the transformer comprising a bias capacitor connected between the transformer and ground and a bias voltage applied to the connection between the capacitor and the transformer.
2 more elements
A broadband R-F optical receiver comprising:
- a photodiode having two electrodes, the first electrode being connected to electrical ground;
- an R-F amplifier having an input, an output, and an input impedance substantially different from the impedance of the photodiode;
- a ferromagnetic transformer having first and second windings, the first winding being connected between the second electrode of the photodiode and the input of the amplifier, and the second winding of the transformer being connected between the input of the amplifier and the electrical ground.
A broadband R-F optical receiver comprising:
- a photodiode having two electrodes, the first electrode being connected to electrical ground;
- an R-F amplifier having an input, an output, and an input impedance substantially different from the impedance of the photodiode;
- a transformer having a ferromagnetic core having a first side and second side with two openings therethrough and a center web between the openings;
- the first winding having first and second ends and being wrapped one to ten times around the center web of the transformer, its first end being connected to the photodiode;
- and
- the second winding having a first end and second end and wrapped one to ten times around the center web of the transformer, the first end of the second winding being connected to the second end of the first winding and to the input of the amplifier, and the second end of the second being winding connected to the ground.
3 more elements
A broadband R-F optical receiver comprising:
- a photodiode having two electrodes, the first electrode being connected to electrical ground;
- an R-F amplifier having an input, an output, and an input impedance substantially different from the impedance of the photodiode;
- a transformer having a ferromagnetic core in the shape of a torus and first and second windings;
- the first winding having first and second ends and being wrapped one to ten times around the core, its first end being connected to the photodiode;
- and
- the second winding having first and second ends being and wrapped around the core, the first end of the second winding being connected to the second end of the first winding and to the input of the amplifier, and the second end of the second winding being connected to the ground.
3 more elements
A broadband R-F optical receiver comprising:
- a photodiode having two electrodes, the first electrode being connected to electrical ground;
- a series inductor having an input and output, its input being connected to the second electrode of the photodiode;
- a ferromagnetic transformer having first and second windings, the first winding being connected between the output of the series inductor and a first end of the second winding, a second end of the second winding being connected to the ground;
- and
- an R-F amplifier having an input, an output, and an input impedance substantially different from the impedance of the photodiode, with its input being connected to the first end of the second winding of the transformer.
2 more elements
A broadband R-F optical receiver comprising:
- a photodiode having two electrodes, the first electrode being connected to electrical ground;
- a series inductor having an input and output, its input being connected to the second electrode of the photodiode;
- the transformer having a ferromagnetic core and first and second windings;
- the ferromagnetic core having a first side and second side with two openings therethrough and a center web between the openings;
- the first winding having first and second ends and being wrapped one to ten times around the center web of the transformer, its first end being connected to the photodiode;
- the second winding having a first and second ends ad wrapped one to ten times around the center web of the transformer, the first end of the second winding being connected to the second end of the first winding and to the input of an R-F amplifier, and the second end of the second winding being connected to the ground;
- and
- the R-F amplifier having an input, an output, and an input impedance substantially different from the impedance of the photodiode, with its input being connected to the first end of the second winding of the transformer.
5 more elements
A broadband R-F optical receiver comprising:
- a photodiode having two electrodes, the first electrode being connected to electrical ground;
- a series inductor having an input and output, its input being connected to the second electrode of the photodiode;
- the transformer having a ferromagnetic core and first and second windings;
- the ferromagnetic core being in the shape of a torus;
- the first winding having first and second ends and being wrapped one to ten times around the core, its first end being connected to the photodiode;
- the second winding having first and second ends and being wrapped around the core, the first end of the second winding being connected to the second end of the first winding and to the input of an R-F amplifier, and the second end of the second winding being connected to the ground;
- and
- the R-F amplifier having an input, an output, and an input impedance substantially different from the impedance of the photodiode, with its input being connected to the first end of the second winding of the transformer.
5 more elements
A broadband R-F optical receiver comprising:
- a photodiode having two electrodes, the first electrode being connected to electrical ground;
- a series inductor having an input and output, its input being connected to the second electrode of the photodiode;
- a transformer having first windings with first and second ends and second windings with first and second ends, the first winding being connected between the output of the series inductor and the first end of the second winding;
- a series capacitor having an input and output, its input being connected to the first end of the second winding of the transformer;
- an R-F amplifier having an input, an output, and an input impedance substantially different from the impedance of the photodiode, with its input being connected to the output of the series capacitor;
- a bias capacitor having one electrode connected to the second end of the second winding and its other electrode being connected to the ground;
- and
- means for applying a bias voltage to the electrode of the capacitor which is connected to the second end of the second winding.
5 more elements
Dependencies are inferred from the claim text.