Optoelectronic receiver and method of signal adjustment
AssigneeTriQuint Technology Holding Co.
InventorBoris A. Kurchuk
Life of this patent
Estimating the term…
Abstract
An optoelectronic receiver having a variable transfer function to compensate for operational condition change. The receiver comprises a linear circuit having a tunable filter. A control circuit provides a signal to the tunable filter. The control circuit is connected to one or more sensors which sense one or more operational conditions. The control circuit signal is a function of the one or more sensed operational conditions. The control signal is input to the tunable filter which adjusts the linear circuit's transfer function based on the control signal. Further disclosed are an integrated circuit and optical communication system having the inventive optoelectronic receiver. A method for adjusting an optoelectronic signal in a receiver is also disclosed.
Claims17
An optoelectronic receiver comprising:
- a linear circuit comprising a tunable filter having a transfer function, a photodiode electrically connected to an amplifier, and the tunable filter electrically connected to the amplifier, wherein the amplifier receives an output signal from the photodiode and provides an amplified signal to the tunable filter;
- and
- a control circuit electrically connected to the tunable filter, the control circuit connected to one or more sensors which sense one or more operational conditions;
- wherein the control circuit generates a control signal that is a function of the one or more sensed operational conditions, and the control signal is input to the tunable filter which adjusts the linear circuit's transfer function based on the control signal.
A method of adjusting an optoelectronic signal in a linear circuit according to operating conditions, the linear circuit having a tunable filter, a photodiode electrically connected to an amplifier, and the tunable filter electrically connected to the amplifier, wherein the method comprises:
- sensing one or more operating conditions;
- providing a control signal that is a function of the operating conditions;
- inputting into the tunable filter the control signal;
- receiving by the amplifier an output signal from the photodiode;
- providing by the amplifier an amplified signal to the tunable filter;
- and
- adjusting by the tunable filter the transfer function of the linear circuit based on the control signal.
A method of adjusting an optoelectronic signal in a linear circuit according to operating conditions, the linear circuit having a tunable filter, wherein the method comprises:
- a. selecting a control voltage Vn from a first memory location wherein n=1, 2, 3 . . . ;
- b. delaying for a time period to allow the control voltage to settle;
- c. measuring the bit-error-rate BERn at the selected control voltage;
- d. determining whether n≦nmax;
- e. if n≦nmax then incrementing n by 1 and selecting from the first memory location a control voltage corresponding to the incremented n value then returning to step c;
- f. if nnmax then finding the minimum bit-error-rate BERm from BER1 . . . BERmax in a second memory location;
- g. finding a target control voltage Vm from the first memory location for n=m;
- h. sending the target control voltage Vm to the tunable filter, thereby causing the transfer function of the linear circuit to be adjusted according to the operating conditions.
A method of adjusting an optoelectronic signal in a linear circuit according to operating conditions, the linear circuit having a tunable filter, wherein the method comprises:
- a. selecting from a first memory location a control voltage Vn;
- b. delaying for a first time period to allow the control voltage to settle;
- c. measuring the bit-error-rate, BERn;
- d. selecting ΔV and tolerance T from a second and third memory location, respectively;
- e. incrementing the control voltage by ΔV so that Vn+1=Vn+ΔV;
- f. delaying for a second time period to allow the control voltage to settle;
- g. measuring the bit-error-rate, BERn+1;
- h. comparing |BERn+1−BERn| and T;
- i. if |BERn+1−BERn|>T then comparing BERn to BERn+1;
- j. if in step i, BERn+1>BERn then changing the sign of ΔV and returning to step e;
- k. if in step i, BERn+1<BERn then returning to step e;
- l. if in step h, |BERn+1−BERn|≦T, then saving the control voltage Vn+1 as the target voltage in the first memory location;
- and
- m. sending the target control voltage Vn+1 to the tunable filter causing the transfer function of the linear circuit to be adjusted according to the operating conditions.
Dependencies are inferred from the claim text.