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Dgd compensating apparatus

A technology for compensating equipment and components, applied in instruments, optical components, wavelength division multiplexing systems, etc.

Inactive Publication Date: 2008-02-06
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Incidentally, although DGD differs depending on the wavelength, from P.K. Kondamuri et al. "Study of variation of the Laplacian parameter of DGD time derivative with fiber length using measuredDGD data" known to change over time

Method used

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  • Dgd compensating apparatus

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Embodiment Construction

[0014] In the following description, an embodiment of a DGD compensation device according to the present invention will be described in detail with reference to FIG. 1 . In the description of the drawings, the same reference numerals designate the same or corresponding components, and repeated descriptions will be omitted.

[0015] Fig. 1 is a schematic block diagram of an embodiment of a DGD compensation device according to the invention. As shown in Figure 1, the DGD compensation device 1 includes an input port 1a and an output port 1b, and also includes a DGD monitor 2, a polarization controller 3, and a polarization splitter arranged on the optical path between the input port 1a and the output port 1b 4. Optical demultiplexer 5 , optical delay 6 , optical multiplexer 7 , polarization combiner 8 , and bypass fiber 9 .

[0016] The DGD monitor 2 in which light having a plurality of wavelength components different in wavelength from each other is input monitors the DGD of ea...

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Abstract

A DGD compensating apparatus capable of compensating the time varying DGD of each wavelength component in the propagation light. The DGD of each wavelength component in the inputted light is monitored by a DGD monitor, and a polarization splitter splits the inputted light into first polarization light and second polarization light orthogonal to each other. The first polarization light is de-multiplexed by de-multiplexer for each wavelength component, and the de-multiplexed wavelength components in the first polarization light are multiplexed by a multiplexer after being respectively added with delays by an optical delay. The first polarization light in which each wavelength component is added with the associated delay and the second polarization light are combined and thereafter being outputted by a polarization combiner.

Description

technical field [0001] The present invention relates to a device for compensating for a group delay difference (hereinafter referred to as "DGD") between first and second polarizations which are orthogonal to each other which occurs when light propagates. Background technique [0002] An optical fiber used in an optical transmission system serves as an optical transmission path along which wavelength division multiplexed signal light (WDM signal light) having a plurality of wavelength components different in wavelength from each other propagates. When WDM signal light propagates along an optical fiber transmission path, waveform degradation of each wavelength component occurs due to dispersion and polarization mode dispersion. Significant waveform degradation caused in each wavelength component prohibits both high bit rate transmission and long distance transmission. Therefore, low chromatic dispersion and polarization mode dispersion are desired in the fiber transmission p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/02H04B10/18H04J14/02G02B6/27H04B10/2507G02B27/28H04B10/07H04B10/2569
CPCH04B10/2569H04J14/02H04J14/0307
Inventor 屉冈英资多久岛道子
Owner SUMITOMO ELECTRIC IND LTD