Automatic gain control circuit, optical receiver and optical communication system
An automatic gain control, optical receiver technology, applied in the field of optical communication, can solve the problems of TIA circuit saturation, non-linearity, failure to work properly, etc.
Active Publication Date: 2022-05-17
EVERPRO TECH COMPANY
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Problems solved by technology
In such a case, if the gain of the fixed TIA is constant, it is difficult to cover the dynamic range of the received signal: if the gain is too small, the output amplitude of the TIA will be small and the performance will be poor under small signals; if the gain is too large, the The TIA circuit is saturated under a large signal, and severe nonlinearity occurs, resulting in failure to work normally
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[0033] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail. In addition, in the description of the specification and appended claims of the present application, the terms "first", "second", "third" and so on are only used to distinguish descriptions, and should not be understood as indicating or implying relative importance.
[0034] In some existing studies and papers, some implementations of TIA AGC are proposed. Typically, a transimpedance ...
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The application proposes an automatic gain control circuit, an optical receiver and an optical communication system. The automatic gain control circuit includes: an analog-to-digital conversion module, configured to perform analog-to-digital conversion processing on the received signal strength indication signal of the channel, so as to obtain a corresponding first digital signal; and an automatic gain control module, configured to perform according to the The first digital signal output by the analog-to-digital conversion module determines the transimpedance gain parameter applicable to the received signal, wherein the automatic gain control module includes: an adjustment unit, which is used to multiply the first digital signal by a preset adjustment coefficient to obtain Obtaining the second digital signal, wherein the adjustment coefficient is preset according to the parameters of the receiving end of the channel; and a look-up table unit, configured to determine the adjustment coefficient applicable to the set by inquiring a pre-stored look-up table according to the second digital signal Transimpedance gain parameter of the received signal. The application can simplify circuit design and improve the accuracy of automatic gain control.
Description
technical field [0001] The present application relates to the field of optical communication, in particular to an automatic gain control circuit, an optical receiver and an optical communication system. Background technique [0002] In the optical receiver of optical fiber communication, generally, the optical signal received by the optical receiver is converted into a current signal by a photodiode (Photo-Diode, PD), and then the current signal is converted by a transimpedance amplifier (Trans-Impedance Amplifier, TIA). Convert to a voltage signal for processing. The dynamic range of the receiver's input signal (that is, the received optical signal, also known as the received signal) is often large, and the light intensity may usually be between -14dBm and 2dBm, and the difference between the strongest and the weakest signal is more than ten dBm . In such a case, if the gain of the fixed TIA is constant, it is difficult to cover the dynamic range of the received signal: i...
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IPC IPC(8): H04B10/69H03G3/30
Inventor 程煜烽李彦
Owner EVERPRO TECH COMPANY