METHOD AND APPARATUS FOR ADJUSTING THE GAIN OF AN AMPLIFIER OF AN OPTICAL RECEIVER MODULE BASED ON LINK BIT ERROR RATE (BER) MEASUREMENTS
First Claim
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1. An apparatus for adjusting the gain of a transimpedance amplifier (TIA) of an optical receiver (RX) module of an optical communications device based on link bit error rate (BER) measurements, the apparatus comprising:
- an open loop gain adjustment circuit of the optical RX module, the gain adjustment circuit being configured to adjust a gain of the TIA of the optical RX module; and
a module controller of the optical RX module, the module controller receiving at least one control bit from a processing device that is external to the optical RX module, said at least one control bit being associated with a link BER measurement obtained by the external processing device, the module controller generating at least one control signal based on said at least one control bit received from the external processing device and outputting said at least one control signal to the open loop gain adjustment circuit to cause the open loop gain adjustment circuit to adjust the gain of the TIA.
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Abstract
An open loop gain adjustment method and apparatus are provided for adjusting the gain of a TIA of an optical RX module based on measurements of the BER of the optical link in which the optical RX module is employed. The gain of the TIA is adjusted until a determination is made that a satisfactory or optimum link BER has been achieved.
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Citations
20 Claims
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1. An apparatus for adjusting the gain of a transimpedance amplifier (TIA) of an optical receiver (RX) module of an optical communications device based on link bit error rate (BER) measurements, the apparatus comprising:
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an open loop gain adjustment circuit of the optical RX module, the gain adjustment circuit being configured to adjust a gain of the TIA of the optical RX module; and a module controller of the optical RX module, the module controller receiving at least one control bit from a processing device that is external to the optical RX module, said at least one control bit being associated with a link BER measurement obtained by the external processing device, the module controller generating at least one control signal based on said at least one control bit received from the external processing device and outputting said at least one control signal to the open loop gain adjustment circuit to cause the open loop gain adjustment circuit to adjust the gain of the TIA. - View Dependent Claims (2, 3, 4, 5, 6, 7, 14, 15, 16)
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8. An apparatus for adjusting the gain of a transimpedance amplifier (TIA) of an optical receiver (RX) module of an optical communications device based on link bit error rate (BER) measurements, the apparatus comprising:
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a system controller mounted on a system circuit board of the optical communications system; an open loop gain adjustment circuit of the optical RX module, the optical RX module being mounted on the system circuit board, the gain adjustment circuit being configured to adjust a gain of the TIA of the optical RX module; and a module controller of the optical RX module, the module controller communicating with the system controller via an interface, the module controller receiving at least one control bit from the system controller via the interface, said at least one control bit being associated with a link BER measurement obtained by the system controller, the module controller generating at least one control signal based on said at least one control bit received from the system controller and outputting said at least one control signal to the open loop gain adjustment circuit to cause the open loop gain adjustment circuit to adjust the gain of the TIA. - View Dependent Claims (9, 10, 11, 12)
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13. A method for adjusting the gain of a transimpedance amplifier (TIA) of an optical receiver (RX) module of an optical communications device based on link bit error rate (BER) measurements, the method comprising:
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in a module controller of the optical RX module, receiving at least one control bit from a processing device that is external to the optical RX module, said at least one control bit being associated with a link BER measurement obtained by the external processing device; in the module controller, generating at least one control signal based on said at least one control bit received from the external processing device and outputting said at least one control signal to the open loop gain adjustment circuit; and in the open loop gain adjustment circuit, receiving said at least one control signal output by the module controller and causing the open loop gain adjustment circuit to adjust the gain of the TIA based on said at least one control signal. - View Dependent Claims (17, 18, 19)
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20. A computer-readable medium having computer instructions stored thereon for adjusting the gain of a transimpedance amplifier (TIA) of an optical receiver (RX) module of an optical communications device based on link bit error rate (BER) measurements, the instructions comprising:
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a first set of instructions for execution by a module controller of the optical RX module, the first set of instructions causing the module controller to receive at least one control bit from a processing device that is external to the optical RX module, said at least one control bit being associated with a link BER measurement obtained by the external processing device; a second set of instructions for execution by the module controller, the second set of instructions causing at least one control signal to be generated based on said at least one control bit received from the external processing device; and a third set of instructions for execution by the module controller, the third set of instructions causing said at least one control signal to be output to an open loop gain adjustment circuit to cause the open loop gain adjustment circuit to adjust the gain of the TIA.
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Specification