US 2012/0057884 A1 · METHOD, APPARATUS, AND SYSTEM FOR FEEDBACK CONTROL OF COHERENT RECEIVER

Abstract

A method, an apparatus, and a system for feedback control of a coherent receiver are provided. The method for feedback control of the coherent receiver includes: obtaining a feedback control quantity according to a digital signal converted by an Analog-to-Digital Converter (ADC); and adjusting a signal amplitude output by a Transimpedance Amplifier (TIA) and a direct current component of an offset T device according to the feedback control quantity, until an analog signal input into the ADC is in a sampling range of the ADC, where the TIA is serially connected to the offset T device and then is connected to the ADC. Present invention has the following advantages: enabling the analog signal to adapt to the ADC sampling best, maximizing an effective information quantity sampled by the ADC and better supporting subsequent processing of a Digital Signal Processing (DSP) unit, thereby improving a coherent receiving performance.

Claims14

Dependent claims

A method for feedback control of a coherent receiver, comprising:

obtaining a feedback control quantity according to a digital signal converted by an Analog-to-Digital Converter (ADC);
and
adjusting, according to the feedback control quantity, a signal amplitude output by a Transimpedance Amplifier (TIA) and a direct current component of an offset T device, until an analog signal that enters the ADC is in a sampling range of the ADC, wherein the TIA is serially connected to the offset T device and then is connected to the ADC.

An apparatus for feedback control of a coherent receiver, comprising:

an obtaining module configured to obtain a feedback control quantity according to a received digital signal converted by an Analog-to-Digital Converter (ADC);
and
an adjusting module configured to adjust a signal amplitude output by a Transimpedance Amplifier (TIA) and a direct current component of an offset T device according to the feedback control quantity until an analog signal that enters the ADC is in a sampling range of the ADC, wherein the TIA is serially connected to the offset T device and then is connected to the ADC.

A system for feedback control of a coherent receiver, comprising:

a Digital Signal Processing (DSP) unit, an Analog-to-Digital Converter (ADC), a Transimpedance Amplifier (TIA), and an offset T device, wherein
the DSP unit is configured to receive a digital signal converted by the ADC and obtain a feedback control quantity;
and adjust, according to the feedback control quantity, a signal amplitude output by the TIA and a direct current component of the offset T device, until an analog signal that enters the ADC is in a sampling range of the ADC, wherein the TIA is serially connected to the offset T device and then is connected to the ADC;
the offset T device is configured to receive the feedback control quantity from the DSP unit and output the adjusted direct current component of the offset T device, so as to adjust the analog signal that enters the ADC;
and
the TIA is configured to receive the feedback control quantity from the DSP unit and output the adjusted signal amplitude of the TIA, so as to adjust the analog signal input into the ADC.

3 more elements

Dependencies are inferred from the claim text.

Method, apparatus, and system for feedback control of coherent receiver

Life of this patent

Method, apparatus, and system for feedback control of coherent receiver

Life of this patent

Abstract

Claims14