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A Low Noise Broadband Fiber Transimpedance Amplifier

A transimpedance amplifier and low-noise technology, applied in the field of optical fiber communication receiver systems, can solve problems such as reducing the input equivalent noise current, and achieve the effects of suppressing common-mode interference, improving noise performance, and ensuring stability

Active Publication Date: 2016-09-07
BEIJING MXTRONICS CORP +1
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  • Description
  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, to propose a low-noise broadband optical fiber transimpedance amplifier, which uses a capacitor to form a feedback path, effectively reducing the input equivalent noise current; by reducing the capacitor C in the same proportion 1 、C 2 It can ensure that the bandwidth of the amplifier is improved under the condition of constant transimpedance gain; the ingenious use of diodes D1, D2, D4, D5, and Q5, Q6 in the broadband output stage ensures the stability of the circuit

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  • A Low Noise Broadband Fiber Transimpedance Amplifier
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  • A Low Noise Broadband Fiber Transimpedance Amplifier

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Embodiment Construction

[0017] A low-noise broadband optical fiber transimpedance amplifier proposed by the present invention is described in detail as follows in conjunction with the accompanying drawings and embodiments.

[0018] A kind of low-noise broadband optical fiber transimpedance amplifier proposed by the present invention comprises five parts: input stage 100, pseudo-input stage 200, broadband amplifying unit 300, broadband output stage 400 and DC elimination loop 500, the concrete circuit structure of each part and The connection relationship is described as follows:

[0019] The input stage 100 consists of NPN tubes Q1, Q2, Q3, Q4, resistor R 1 , R 2 , capacitance C 1 、C 2 , and composed of diodes D1, D2, D3. Its connection relationship is: photocurrent signal I in Input to the base of Q1, the emitter of Q1 is connected to GND1, the collector of Q1 is connected to the emitter of Q2, the base of Q2 is connected to the DC bias voltage Ve, and the collector of Q2 is the output out1 of ...

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Abstract

A low-noise broadband optical fiber trans-impedance amplifier belongs to the field of optical fiber communication receiver systems technology and comprises an input stage, a pseudo-input stage, a broadband amplifier unit, a broadband output stage and a DC elimination loop. The pseudo-input stage has the same structure with the input stage. The broadband amplifier unit is mainly composed of two diodes and a Cherry-Hooper amplifier. The broadband output stage is mainly composed of six NPN tubes and two resistors. The DC elimination loop is mainly composed of two low pass filters LPF, an error amplifier ERR_AMP and an NPN tube. The low-noise broadband optical fiber trans-impedance amplifier has advantages as follows: noise of an optical fiber trans-impedance amplifier can be reduced; bandwidth of the optical fiber trans-impedance amplifier can be raised; and DC component of front-end photodiodes can be eliminated.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication receiver systems, and relates to a low-noise broadband optical fiber transimpedance amplifier. Background technique [0002] With the development of society, the amount of information exchange is increasing day by day. In recent years, the optical fiber communication with light wave as the carrier and optical fiber as the transmission medium has sprung up and developed very rapidly, and has become the main body of the information highway. This communication method has become the most important transmission method of wired channels due to its advantages such as huge available bandwidth, long transmission distance, and extremely low transmission loss. The transimpedance amplifier is located at the front end of the optical fiber communication system receiver. It converts the weak current signal generated by the photodetector into a voltage signal that meets the requirements. Its ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03G3/20H03F3/08
Inventor 焦洋张佃伟侯训平李卫民
Owner BEIJING MXTRONICS CORP
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