Optical relay device and bidirectional service transmission method

Abstract

The invention discloses optical relay equipment, which comprises an optical circulator 1, an optical amplifying unit 1, an optical circulator 2, an optical amplifying unit 2, and a reflection filtering unit, wherein the optical circulator 1 is used for outputting a first optical signal which is input from a first port of the optical circulator 1 through a second port of the optical circulator 1, and the first optical signal comprises a first service optical signal; the optical amplifying unit 1 is used for amplifying the first optical signal which is output from the second port of the opticalcirculator 1; the optical circulator 2 is used for outputting a second optical signal which is input from a first port of the optical circulator 2 through a second port of the optical circulator 2, and the second optical signal comprises a second service optical signal; the optical amplifying unit 2 is used for amplifying the second optical signal which is output from the second port of the optical circulator 2; and the reflection filtering unit is used for reflectively outputting the first service optical signal and the second service optical signal which are received by the optical amplifying unit 1 and the optical amplifying unit 2 respectively, and outputting the first service optical signal and the second service optical signal to the second port of the optical circulator 1 and the second port of the optical circulator 2 after the re-amplification of the optical amplifying unit 1 and the optical amplifying unit 2. The use of the technical proposal can reduce the cost for the optical relay equipment.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to an optical relay device and a two-way service transmission method. Background technique [0002] With the maturity of dense wavelength division multiplexing technology (Dense Wavelength Division Multiplexing, DWDM) and Erbium-Doped Fiber Amplifier (Erbium-Doped Fiber Amplifier, EDFA) technology, the long-distance, high-capacity optical communication system composed of optical fiber and EDFA is becoming more and more popular. Increasingly, such as submarine optical cable communication systems, the optical repeater (Repeater) of the submarine cable system is usually composed of one or several pairs of EDFAs, which amplify the optical signals in the two transmission directions. The submarine optical cable communication system is generally thousands of kilometers long, and the span between two Repeaters is about 50-100km. Since the submarine optical cable system carries...

AI Technical Summary

Problems solved by technology

[0006] 2. In the existing technology, in order to ensure that the service light continues to be transmitted in the uplink / downlink and the detection light can be separated, an optical splitter is used before and / or after the amplifying unit. However, because the input end of the amplifying unit The use of a splitter will lead to the deterioration of the noise index of the optical repeater, resulting in a decrease in the optical signal-to-noise ratio (OSNR) of the service light; the use of a splitter at the output of the amplifying unit increases additional loss and realizes The same output power puts higher demands on the pump unit

[0008] 4. The number of optical devices used in the existing technical solutions is large, which is not conducive to improving reliability and reducing costs

Images