Optical input preamplifier for optical communication receiver

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.

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] ...

AI Technical Summary

Problems solved by technology

[0006] The optical input preamplifiers of the above-mentioned patents are difficult to cope with the reception and amplification of burst signals due to the response time delay and low reception sensitivity in the circuit. However, with the development of optical communication technology and networks, passive optical network The development and application of new technologies such as (PON), Optical Burst Switching (OBS), Optical Packet Switching (OPS), etc., require that the optical receiving preamplifier be suitable for receiving and amplifying burst optical signals, and improve the optical receiving as much as possible. Receive Sensitivity of the Preamplifier

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