450MHZ repeater Ethernet single-fiber optical transceiver with automatic gain compensation of light loss

Abstract

The invention provides a 450MHZ repeater Ethernet single-fiber optical transceiver with automatic gain compensation of light loss. The optical transceiver comprises an input RF channel, an output RF channel, a wavelength division multiplexing device and an Ethernet communication circuit; the input RF channel comprises a filtering circuit, an ALC control circuit, an RF switch circuit, an amplification circuit, an attenuation circuit, a coupling circuit and a laser circuit connected successively; the output RF channel comprises a light receiver, a coupling circuit, an amplification circuit, an ATT automatic compensation circuit and a filtering circuit connected successively; the Ethernet communication circuit is connected to the coupling circuits in the input RF channel and the output RF channel, and is provided with Ethernet interfaces; and the wavelength division multiplexing device is connected with a wavelength division multiplexing device of another optical transceiver via a fiber or connected with optical transceiver modules via an optical divider. According to the invention, functions of a present analog optical transceiver are improved, so that automatic gain compensation of light loss is realized in the present analog optical transceiver.

Description

Technical field [0001] The invention relates to the field of railway optical fiber communication, in particular to a 450MHZ repeater Ethernet single-fiber optical transceiver with optical loss automatic gain compensation. Background technique [0002] The analog optical transceiver module is one of the key modules of the 450MHz analog optical fiber repeater for wireless train adjustment. It mainly converts the radio frequency signal of the 450MHz station radio into an optical signal, which is transmitted through optical fiber. The signal transmitted by the analog optical transceiver in the optical fiber is an analog optical signal, which is cheap and commonly used. During data transmission, the analog optical transceiver first modulates the baseband signal into a radio frequency signal using FSK, and then performs electrical-optical conversion before transmission. After the optical signal is transmitted to the receiving end, it also performs optical-electrical conversion, and the...

AI Technical Summary

Problems solved by technology

This kind of analog optical transceiver has some disadvantages: mainly low transmission rate and poor anti-interference performance, it is not suitable for the comprehensive and rapid transmission of rail transit information, which hinders the rapid development of rail transit to a certain extent

[0003] In addition, the 450MHz analog repeater is affected by the length of the optical fiber in engineering applications, resulting in inconsistent gain of the repeater system. Reach 10~20dB, which means that the fiber length of the farthest remote machine is 10~20km longer than that of the nearest remote machine

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