Optical input preamplifier for optical communication receiver

A preamplifier and receiver technology, applied in the field of optical communication reception, can solve the problems of difficult-to-burst signal reception amplification, response delay and low reception sensitivity, and achieve high open-loop gain and bandwidth, high optical reception sensitivity, and reduced response time. delayed effect

CN101651449BInactive Publication Date: 2011-06-15上海博为光电科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2011-06-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an optical input preamplifier for an optical communication receiver, which comprises a photoelectric conversion circuit, a feedback resistor, a Darlington circuit, a common base electrode amplifying circuit, a bias circuit, a difference amplifying circuit and an output buffer circuit, wherein the feedback resistor is connected with the photoelectric conversion circuit; theDarlington circuit is connected with the feedback resistor; the common base electrode amplifying circuit is connected with the Darlington circuit and is driven based on current; the bias circuit is used for providing preset bias voltage; two input ends of the difference amplifying circuit are respectively connected with the common base electrode amplifying circuit and the bias circuit, and the output end of the difference amplifying circuit is connected with the feedback resistor so as to enable the difference amplifying circuit, the feedback resistor, the common base electrode amplifying circuit and the Darlington circuit to form a transresistance negative feedback loop; and the output buffer circuit is connected with the difference amplifying circuit. The optical input preamplifier for the optical communication receiver, which is provided by the invention, has higher optical receiving sensitivity, can be suitable for the reception and the amplification of an outburst optical signal and is also suitable for the reception and the amplification of the traditional continuous signal.
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Description

technical field

[0001] The invention relates to the field of optical communication receiving, in particular to an optical input preamplifier used in an optical communication receiver. Background technique

[0002] Generally, the role of the optical input preamplifier used in optical communication receivers in optical communication systems is to convert optical signals into electrical signals, and it generally consists of a photodiode (PD) and a transimpedance amplifier (TIA), where , the photodiode converts the received optical signal into a current signal, and then converts it into a voltage signal through a transimpedance amplifier and amplifies the output. Since the transimpedance gain and noise characteristics of the optical input preamplifier are important technical indicators that determine the receiving sensitivity of the optical receiver, the optical input preamplifier is one of the core components of the optical receiving and optical communication system.

[0003] ...

Examples

Embodiment Construction

[0033] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0034] Please refer to figure 1 , the optical input preamplifier for optical communication receiver provided by the present invention comprises a photodiode 1, a feedback resistor (Rf) 2, a reach by field effect transistor (FET) and bipolar transistor (BT) Linton circuit 3, a current-driven common base amplifier circuit 4, a differential amplifier circuit 5, a bias circuit 6 providing bias voltage, and a differential amplifier circuit 7 with voltage negative feedback.

[0035] The photodiode 1 converts the received light signal into a current signal, and the current signal is converted into a voltage signal through the feedback resistor 2 . The FET-BT Darlington circuit 3 converts the above-mentioned voltage signal into a current signal with a very high transconductance, and injects the current signal into the current-driven common base ampl...