Ciena Corporation

Ron Hartman

Tom M Luk

Michael Vitic

An automatic gain control system for a receiver, including: an automatic gain control loop () adapted to be coupled to both a first transimpedance amplifier () coupled to a first analog-to-digital converter () forming a first tributary and a second transimpedance amplifier () coupled to a second analog-to-digital converter () forming a second tributary; and an offset gain control voltage to gain balance a transimpedance amplifier gain of the first tributary and a transimpedance amplifier gain of the second tributary. The automatic gain control loop can be analog. Also, the automatic gain control loop can be implemented in hardware or firmware.

Receiver automatic gain control systems and methods

A coherent optical modem includes one or more inputs; one or more amplifier circuits, each coupled to a respective input of the one or more inputs; and one or more receiver circuits each including an analog-to-digital converter, each coupled to a respective amplifier circuit of the one or more amplifier circuits; wherein the one or more amplifier circuits are configured to implement an automatic gain control loop to provide a constant signal amplitude at an input of the analog-to-digital converter of a respective receiver circuit.

Coherent optical modem with method to discover and control an amplifier's automatic gain control (AGC) loop bandwidth

An amplifier circuit includes: an amplifier configured to receive at least one input signal and generate an output voltage in response to the at least one input signal and a gain control voltage; a voltage detector configured to generate a detector voltage based on the output voltage; a gain control summation circuit configured to generate an error signal by subtracting the detector voltage from a reference voltage; a loop filter configured to generate the gain control voltage based on the error signal and adjust the loop bandwidth in response to a loop filter adjust signal; and an analog automatic gain control bandwidth controller configured to monitor the detector voltage and the gain control voltage, to provide the reference voltage and the loop filter adjust signal, and to control a loop bandwidth of the output signal.

Method to discover and control an amplifier's automatic gain control (AGC) loop bandwidth

An automatic gain control system for a receiver for an asymmetrical and/or unbalanced constellation, the system including: an automatic gain control loop adapted to be coupled to both a first transimpedance amplifier coupled to a first analog-to-digital converter forming a first tributary and a second transimpedance amplifier coupled to a second analog-to-digital converter forming a second tributary; wherein the automatic gain control loop is operable for providing an offset gain control voltage to gain balance a transimpedance amplifier voltage and a power associated with the first tributary and a transimpedance amplifier voltage and a power associated with the second tributary. The automatic gain control loop includes an analog automatic gain control loop. The automatic gain control loop is implemented in hardware or firmware.

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Fitzroy Harbour, Canada

Ron Hartman