Gain compensating optical receiver circuit
First Claim
1. A method for converting an optical communications signal into the electrical domain comprising:
- converting the optical communications signal into an electrical signal comprising a modulated electrical signal and a bias electrical signal;
generating a control signal based on the bias electrical signal;
controlling a gain in a feedforward manner with the control signal; and
amplifying the modulated electrical signal according to the gain.
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Accused Products
Abstract
An optical receiver circuit receives analog optical signals and outputs corresponding electrical signals. The circuit'"'"'s amplifier can amplify a modulated signal from a photodiode. Gain control can adjust the amplifier'"'"'s gain to compensate for power fluctuation in the optical signals. Linear compensation can enhance the linearity of the gain adjustment in response to optical power fluctuation and can facilitate feedforward gain control. A digital controller can implement the linear compensation. The circuit can operate with an impedance mismatch in the coupling between the photodiode and the amplifier, thereby avoiding the need for an impedance matching transformer in that coupling.
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Citations
39 Claims
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1. A method for converting an optical communications signal into the electrical domain comprising:
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converting the optical communications signal into an electrical signal comprising a modulated electrical signal and a bias electrical signal;
generating a control signal based on the bias electrical signal;
controlling a gain in a feedforward manner with the control signal; and
amplifying the modulated electrical signal according to the gain. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for converting optical communication signals into electrical communication signals comprising:
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receiving light from a waveguide;
generating an electrical current corresponding to the received light;
transmitting a modulated component of the electrical current through an impedance mismatch;
applying amplification to the modulated component of the electrical current; and
adjusting the amplification. - View Dependent Claims (14, 15, 16)
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17. An optical receiver comprising:
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a light detector comprising an optical port and an electrical port;
an amplifier comprising;
an input port coupled to the electrical port of the light detector;
an output port; and
a gain control port; and
a gain control circuit comprising a linear compensator, wherein the gain control circuit is coupled to the electrical port of the light detector and to the gain control port of the amplifier. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An optoelectronic system comprising:
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an optical detector for receiving an analog optical signal and generating an analog electrical signal;
an amplifier circuit connected to the optical detector for amplifying at least some portion of the analog electrical signal; and
a control circuit connected to the amplifier circuit for controlling the amplification of the amplifier circuit, wherein the control circuit comprises a linearity compensation component. - View Dependent Claims (30, 31, 32, 33, 34)
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35. A circuit operative to receive optical signals broadcast over a fiber optic network and to output radio frequency electrical signals corresponding to the broadcast optical signals, the circuit comprising:
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a photodiode;
an amplifier in communication with the photodiode, for amplifying modulated current from the photodiode;
a gain control circuit in communication with the amplifier, for controlling the amplifier; and
an impedance mismatch between the amplifier and the photodiode. - View Dependent Claims (36, 37, 38, 39)
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Specification