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Amplification device with amplification stages with polarized soas and processing stage, for amplifying optical signals in a WDM transmission system

A technique for amplifying devices and optical signals, applied in polarization multiplexing systems, optical multiplexing systems, transmission systems, etc.

Inactive Publication Date: 2018-07-31
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the optical bandwidth of EDFA is currently the limiting factor for the continuous increase in the capacity of WDM transmission systems

Method used

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  • Amplification device with amplification stages with polarized soas and processing stage, for amplifying optical signals in a WDM transmission system
  • Amplification device with amplification stages with polarized soas and processing stage, for amplifying optical signals in a WDM transmission system
  • Amplification device with amplification stages with polarized soas and processing stage, for amplifying optical signals in a WDM transmission system

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Embodiment Construction

[0034] The following discloses in particular an amplification device 1 intended for amplifying an input optical signal in a wavelength division multiplexed (or WDM) transmission system.

[0035] Such as figure 1 and 3 As explained in , the amplifying device 1 according to the invention comprises at least a first splitting element 2, a first amplifying stage 3 1 and the second amplifier stage 3 2 , an intermediate processing stage 4 , a first combination element 6 and a control member 6 .

[0036] The first splitting element 2 is arranged (or configured) for splitting the input optical signal S in first and second optical signals having first and second polarization modes respectively in . As illustrated, this input optical signal S in Provided by the first fiber optic link 7 of the WDM launch system, which is connected to the input of the amplification device 1 .

[0037] For example, the first splitting element 2 may be a polarizing beam splitter which can be realized b...

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Abstract

An amplification device (1) comprises: - an element (2) for splitting an input optical signal in first and second optical signals having first and second polarization modes, - first (31) and second (32) amplification stages each comprising polarized SOAs for amplifying the first and second optical signals depending on driving currents, - an intermediate processing stage (4) for compensating optical characteristics of the optical gain bandwidth of the first amplification stage (31) depending on driving currents, - an element (5) for combining the first and second optical signals outputted by the second amplification stage (32) to produce an output optical signal, and - a control means (6) producing the driving currents depending on information representative of powers of the first and second optical signals before the polarized SOAs of each amplification stage (31-32) and on a targeted power of the output optical signal.

Description

technical field [0001] The present invention relates to wavelength division multiplexing (or WDM) transmission systems, and more precisely to amplification arrangements arranged for amplifying optical signals in such WDM transmission systems. Background technique [0002] In WDM transmission systems, increasing capacity in fiber optic links with constant amplification bandwidth requires increasing spectral efficiency. [0003] To obtain this increase it is possible to use complex modulation formats. This allows spectral efficiencies beyond Quadrature Phase Shift Keying (or QPSK) with Polarization Division Multiplexing (or PDM), which is the industry's preferred solution for 100Gb / s optical Small launch distance. [0004] One can also reduce the channel spacing due to the use of Orthogonal Frequency Division Multiplexing (or OFDM) or Nyquist pulse shaping techniques. Unfortunately, this solution must be limited to a channel spacing equal to the symbol rate in order to avoi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/291H04B10/294H01S5/50
CPCH04B10/2914H04B10/294H01S5/0683H01S5/5027H01S2301/04H01S5/5009H01S5/4031H04J14/0221H01S5/4087H01S5/5036H01S5/5045H04J14/06
Inventor 耶雷米·雷诺迪尔加布里埃尔·夏勒特罗曼·布莱诺特
Owner ALCATEL LUCENT SAS
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