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Multiport input/output single-fiber bidirectional erbium-doped fiber amplifier

An erbium-doped fiber and amplifier technology, which is applied in the field of multi-port input and output single-fiber bidirectional erbium-doped fiber amplifiers, can solve the problems of incompatibility, high cost, crosstalk interference, etc., and achieves reduction of signal amplification cost, system cost, transmission The effect of simple system structure

Inactive Publication Date: 2009-02-18
LIAOCHENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the downlink optical signal is directly amplified by the EDFA, and the uplink signal needs to be amplified by the photoelectric repeater, the cost of this amplification method is high
Since the isolation of the coarse wavelength division multiplexer used is generally only about 15dB, there is crosstalk interference between the uplink signal and the downlink signal
On the other hand, in a passive optical access network or a fiber optic CATV network, there are usually several, a dozen or even dozens of ports at the output end of the downlink signal and the input end of the uplink signal, while the usual erbium-doped fiber amplifier has only one The input port and one output port cannot meet the requirements of passive optical access network or optical fiber CATV network

Method used

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  • Multiport input/output single-fiber bidirectional erbium-doped fiber amplifier
  • Multiport input/output single-fiber bidirectional erbium-doped fiber amplifier
  • Multiport input/output single-fiber bidirectional erbium-doped fiber amplifier

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Fig. 1 is a block diagram of a four-port input-output single-fiber bidirectional erbium-doped fiber amplifier model 1 suitable for a central office. It can be seen from Figure 1 that the multi-port input-output dual-fiber bidirectional erbium-doped fiber amplifier is mainly composed of optical coupler, optical filter, optical circulator, pump light source, pump signal multiplexer, erbium-doped fiber and transmission fiber. The downlink signal from the optical transmitter of the central office is input from port 1 of the optical circulator, output from port 2, coupled with the pump light by the multiplexer 1 into the erbium-doped fiber for amplification, and output to the optical coupler through the multiplexer 2 The device is divided into four downlink optical signals. The four upstream optical signals are combined by the optical coupler into one signal and the pump light enters the erbium-doped fiber through the multiplexer 2 for amplification, and then is output by th...

Embodiment 2

[0021] Fig. 2 is a block diagram of a four-port input-output single-fiber bidirectional erbium-doped fiber amplifier model 2 suitable for a central office. Different from pattern 1, the uplink optical signal and downlink optical signal are amplified in two independent erbium-doped optical fibers. The downlink signal from the central office optical transmitter first enters the erbium-doped fiber for amplification, and then is input by port 1 of the optical circulator, and output from port 2 to the optical coupler to be divided into four downlink optical signals; the four uplink optical signals are first transmitted by the optical The coupler is combined into one optical signal output to the port 2 of the optical circulator, output from the port 3 of the optical circulator, and then enters the erbium-doped optical fiber to be amplified and then output to the optical receiver of the central office.

Embodiment 3

[0023] Fig. 3 is a block diagram of a four-port input-output single-fiber bidirectional erbium-doped fiber amplifier model 1 suitable for an optical network unit. It can be seen from Figure 3 that the downlink optical signal first enters the erbium-doped optical fiber for amplification, and then outputs to port 2 of the optical circulator, then outputs from port 3 of the optical circulator, and then is filtered by an optical filter and divided into four downlink optical signals by the optical coupler. The signal is output to the optical receiving module at the user end. The uplink optical signals from the four user-side optical transmitters are firstly combined by the optical coupler into one optical signal, enter the erbium-doped fiber for amplification, and then output to the port 1 of the optical circulator, output from the port 2 of the optical circulator, and then enter the doped fiber Erbium fiber amplification.

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Abstract

The invention provides a single-fiber bidirectional erbium-doped optical fiber amplifier with multiple input / output ends, which is applied to the single-fiber bidirectional optical fiber communication system, can directly amplify the uplink optical signal and the downlink optical signal, provide a plurality of input / output ends, and is particularly suitable for bidirectional transformation of the optical access network and optical fiber CATV network; and the cost is close to that of traditional erbium-doped optical fiber amplifier.

Description

technical field [0001] The invention relates to an optical signal amplification technology in single-fiber bidirectional optical fiber communication, in particular to an optical signal amplification technology in optical access network and optical fiber cable TV (CATV) network bidirectional transformation. Background technique [0002] The traditional erbium-doped fiber amplifier is mainly composed of erbium-doped fiber, pump light source, optical coupler, optical isolator and optical filter, etc. It can only amplify the signal transmitted in one direction. Erbium-doped fiber amplifiers have been widely used in long-distance, large-capacity, high-speed optical fiber communication systems, passive optical access networks, optical fiber limited television networks, and military systems (radar multiplex data multiplexing, data transmission, guidance, etc.) and other fields. The traditional CATV network adopts coaxial cable, which needs to be amplified every several hundred met...

Claims

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Application Information

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IPC IPC(8): G02F1/39G02B6/26H04B10/24
Inventor 刘山亮
Owner LIAOCHENG UNIV
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