High dynamic range radio frequency to optical link
First Claim
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1. An optical transmitter, comprising:
- an optical generator having a pair of input terminals for receiving a differential electrical drive signal and for outputting a corresponding optical signal;
an input port for receiving an input electrical signal;
a transformer having a primary winding and a second winding, the primary winding receiving the input electrical signal from the input port;
a choke connected to one end of the secondary winding of the transformer and connected directly to a first input terminal of the pair of input terminals to the optical generator;
a second end of the secondary winding of the transformer being connected to a second input terminal of the pair of input terminals to the optical generator;
the secondary winding of the transformer delivering the differential electrical drive signal to the optical generator;
an impedance element between the secondary winding of the transformer and the optical generator for matching an input impedance to the optical generator;
a current driving circuit for providing a constant current drive signal to the optical generator; and
a second choke positioned between the current driving circuit and the optical generator.
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Abstract
A communication system includes an optical transmitter which is differentially driven and an optical receiver that outputs a differential signal. The optical transmitter creates the differential drive signal from an input signal and delivers the differential drive signal to a laser. The differential drive signal is generated with a transformer and RF chokes for floating the laser above ground. The signal detected by the receiver is input as a differential signal to a transformer which then passes the signal through amplifiers and a filter. The optical communication system provides an increased spurious-free dynamic range which is well suited for RF signals and other analog signals.
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Citations
17 Claims
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1. An optical transmitter, comprising:
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an optical generator having a pair of input terminals for receiving a differential electrical drive signal and for outputting a corresponding optical signal; an input port for receiving an input electrical signal; a transformer having a primary winding and a second winding, the primary winding receiving the input electrical signal from the input port; a choke connected to one end of the secondary winding of the transformer and connected directly to a first input terminal of the pair of input terminals to the optical generator; a second end of the secondary winding of the transformer being connected to a second input terminal of the pair of input terminals to the optical generator; the secondary winding of the transformer delivering the differential electrical drive signal to the optical generator; an impedance element between the secondary winding of the transformer and the optical generator for matching an input impedance to the optical generator; a current driving circuit for providing a constant current drive signal to the optical generator; and a second choke positioned between the current driving circuit and the optical generator. - View Dependent Claims (2, 3, 4, 5)
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6. An optical communication system, comprising:
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an optical transmitter comprising; a differential drive circuit for receiving an input electrical signal and for generating a differential drive signal; an optical generator for receiving the differential drive signal and for generating a corresponding optical signal, a current driving circuit for providing a constant current drive signal to the optical generator; a choke positioned between the current driving circuit and the optical generator; wherein the differential drive circuit comprises, an input port for receiving the input electrical signal; a transformer having a primary winding and a second winding, the primary winding receiving the input electrical signal from the input port; a second choke connected to one end of the secondary winding of the transformer and connected directly to a first input terminal of the optical generator; a second end of the secondary winding of the transformer being connected to a second input terminal of the optical generator; the secondary winding of the transformer delivering the differential drive signal to the optical generator; and an impedance element between the secondary winding of the transformer and the optical generator for impedance matching the differential drive circuit to an input impedance to the optical generator; and an optical receiver comprising; an optical detector for receiving the optical signal from the optical transmitter and for generating an electrical detected signal; an amplifier for receiving the detected signal and for generating an amplified signal; wherein the optical signal from the optical transmitter is transmitted to the optical receiver through an optical transmission medium. - View Dependent Claims (7, 8, 9, 10)
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11. A radio frequency communication system, comprising:
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a device for receiving an input radio frequency signal; an optical transmitter comprising; a differential drive circuit for receiving the input radio frequency signal from the device and for generating a differential drive signal; and an optical generator for receiving the differential drive signal and for generating a corresponding optical signal, a current driving circuit for providing a constant current drive signal to the optical generator; and a choke positioned between the current driving circuit and the optical generator; wherein the differential drive circuit comprises, an input port for receiving the input radio frequency signal; a transformer having a primary winding and a second winding, the primary winding receiving the input radio frequency signal from the input port; a second choice connected to one end of the secondary winding of the transformer and connected directly to a first input terminal of the optical generator; a second end of the secondary winding of the transformer being connected to a second input terminal of the optical generator; the secondary winding of the transformer delivering the differential drive signal to the optical generator; and an impedance element between the secondary winding of the transformer and the optical generator for impedance matching the differential drive circuit to an input impedance to the optical generator; and an optical receiver comprising; an optical detector for receiving the optical signal from the optical transmitter and for generating a detected radio frequency signal; an amplifier for amplifying the detected signal and for generating an output radio frequency signal; wherein the optical signal from the optical transmitter is transmitted to the optical receiver through an optical transmission medium. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification