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Transimpedance amplifier

A transimpedance amplifying and circuit technology, applied in the field of transimpedance amplifying circuits, can solve problems such as the lengthening of the gap period

Pending Publication Date: 2020-01-17
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, it takes time until the average value of the output voltage of the amplifier returns to the initial state, so the gap between the end of one burst optical signal input in a predetermined period and the start of the next burst optical signal period becomes longer

Method used

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Examples

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Embodiment Construction

[0044]A specific example of the transimpedance amplifier circuit according to the embodiment of the present disclosure will be described below with reference to the drawings. In addition, this invention is not limited to these examples, but is shown by a claim, and it is intended that the meaning of a claim and equality and all the changes within a range are included.

[0045] First, a PON-based communication system will be described as an example of an optical access system including a transimpedance amplifier circuit according to an embodiment of the present disclosure. Figure 1A It is a block diagram showing a communication system of the PON system. Figure 1A The illustrated communication system 1 includes a communication device 2, a plurality of communication devices 3, an optical splitter 4, a communication path L1, and a plurality of communication paths L2.

[0046] The communication device 2 is arranged in the station building 5 . A plurality of communication devices ...

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Abstract

The invention provides a transimpedance amplifier which converts an input current to a differential signal and outputs the differential signal. The transimpedance amplifier includes a single-ended amplifier configured to convert a current signal to a voltage signal, a first feedback circuit configured to generate a bypass current, a differential amplifier circuit configured to generate the differential signal in accordance with the difference between the voltage signal and a reference voltage signal, and a detector circuit configured to detect a start and an end of a burst optical signal. Thedetector circuit detects the end of the burst optical signal based on a peak value of the positive-phase component and a peak value of the negative-phase component and switches the time constant of the first feedback circuit from a first time constant to a second time constant smaller than the first time constant in response to detecting the end of the burst optical signal.

Description

technical field [0001] The present disclosure relates to a transimpedance amplifier circuit. Background technique [0002] In EPON (Ethernet (registered trademark) Passive Optical Network, Ethernet passive optical network) as an optical access system, as an optical receiver of a station side device (OLT; Optical Line Terminal, optical line terminal), a transimpedance amplifying circuit. The optical receiver of the OLT receives burst optical signals from multiple residential devices (ONU; Optical Network Unit, Optical Network Unit) through time division multiplexing (TDM; Time Division Multiplexing). Since a plurality of ONUs are installed at various distances from the OLT, the transmission path loss from each ONU to the OLT differs depending on the distance. Therefore, for example, the signal strength from an ONU located at a closer distance from the OLT becomes larger, and the signal strength from an ONU located at a greater distance from the OLT than the ONU becomes smal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/30
CPCH03G3/3084H04B10/695H03F1/083H03F2203/45288H04B10/0797H03F1/0277H03F1/3211H03F2200/129H03F3/45071H04B10/66H03F2200/462H03F1/34
Inventor 田中启二
Owner SUMITOMO ELECTRIC IND LTD