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Distributed Raman amplification subsystem and device

A subsystem, Raman technology, applied in the field of optical synchronous digital network, can solve the problems of increasing the cost of opening and maintenance, labor and labor, etc., and achieve the effect of protection safety and low noise

Inactive Publication Date: 2003-03-12
FENGHUO COMM SCI & TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is acceptable to complete such work in the laboratory. If such adjustments are required during the engineering start-up and maintenance process, it will not only take a lot of time and effort, greatly increase the start-up and maintenance costs, but it is often difficult to have such experimental conditions

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  • Distributed Raman amplification subsystem and device
  • Distributed Raman amplification subsystem and device
  • Distributed Raman amplification subsystem and device

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Embodiment Construction

[0037] Distributed Raman fiber amplifier is different from conventional EDFA, its structure is open, because the core component in the amplifier - the gain medium (transmission fiber or dispersion compensation fiber DCF) usually extends tens of kilometers outward. Therefore, a distributed Raman amplification subsystem includes two parts, the high-power pump unit 50 and the transmission fiber 20, and the transmission fiber also serves as a gain medium in addition to transmitting signals. If the gain medium adopts DCF, then such a Raman amplifier also has the function of dispersion compensation.

[0038] Since the gain medium of the amplifier is a common transmission fiber, the amplifier cannot impose any special requirements on the fiber, on the contrary, it must be able to adapt to a variety of fiber types. Even for the same type of optical fiber, such as G.652 optical fiber, products sold by different manufacturers have slightly different Raman amplification characteristics, ...

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Abstract

A distributed Raman amplification subsystem for configuring and automatically controlling the pump power on network management interface and its devices are disclosed. The pump power values needed by different optical fibres under different Raman gains are preset in the subsystem. The actual output power of each pump laser is indirectly measured and then compared with the given value by a feedback-ring controller in order to regulate its output power for meeting requirement.

Description

technical field [0001] The present invention relates to a distributed Raman amplification subsystem and its device, which are used in the field of telecommunication transmission, in particular to optical fiber communication systems that require optical amplification, such as high-speed, long-distance or ultra-long-distance Dense Wavelength Division Multiplexing (DWDM) System and high-speed, single-channel optical synchronous digital network (SDH). Background technique [0002] In large-capacity optical transmission systems, especially dense wavelength division multiplexing (DWDM) systems, optical amplifiers are indispensable. It is because of the invention of Erbium-doped Fiber Amplifier (EDFA) that Dense Wavelength Division Multiplexing (DWDM) technology can develop rapidly. At present, dense wavelength division multiplexing (DWDM) systems based on EDFA optical amplification technology have spread all over the world. However, while EDFA provides gain to the signal, it wil...

Claims

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Application Information

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IPC IPC(8): G02F1/39H04B10/2537
Inventor 刘贤炳谢秋红王红启郭正钧杨铸杨壮
Owner FENGHUO COMM SCI & TECH CO LTD
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