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Coherent light receiving device, system and method

A receiving device and coherent receiving technology, applied in the transmission system, electromagnetic receiver, electromagnetic wave transmission system, etc., can solve problems such as difficult circuit implementation, difficult application, complex signal processing, etc., and achieve the effect of reducing timing deviation

Inactive Publication Date: 2013-07-17
NEC CORP
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Problems solved by technology

Therefore, in the case of heterodyne detection, there is a problem that the electric signal output from the photodetector has a wide band, and it is difficult to apply
However, even in the case of intradyne detection, since the signal processing after reception becomes complicated, it is difficult to implement with a circuit

Method used

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  • Coherent light receiving device, system and method
  • Coherent light receiving device, system and method
  • Coherent light receiving device, system and method

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Embodiment Construction

[0070] Modes for carrying out the invention are described with reference to the drawings.

[0071] figure 1 is a block diagram illustrating the configuration of the coherent light receiving device according to the first embodiment of the present invention.

[0072] It should be noted that the embodiments are for illustration, and the devices and systems of the present disclosure are not limited to the configurations of the following embodiments.

[0073] The coherent light receiving device 1 includes: a coherent receiving unit 11 ; a wavelength dispersion compensating unit 12 ; and a frequency difference detecting unit 13 .

[0074] The coherent light receiving device 1 receives an optical signal including waveform distortion due to wavelength dispersion, mixes the optical signal with local light, performs optical coherent detection to convert the optical signal into an electrical signal, converts the converted electrical signal into a digital signal, And output digital sign...

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Abstract

Provided are a coherent receiving means for mixing a received optical signal and local light, detecting optical coherence and outputting a digital signal, a wavelength dispersion compensation means for compensating for the distortion of the waveform included in the digital signal and outputting the compensated digital signal, and a frequency difference detection means for detecting the frequency difference between the received optical signal and the local light and transmitting the frequency difference to the wavelength dispersion compensation means. The wavelength dispersion compensation means performs compensation using a transfer function that is based on the frequency difference transmitted from the frequency difference detection means and that shows the waveform distortion caused by wavelength dispersion.

Description

technical field [0001] The present invention relates to a coherent light receiving device, system and method, and in particular relates to a coherent light receiving device, system and method combining an intradyne coherent detection technology and a digital signal processing technology. Background technique [0002] Optical fiber communication system is an important technology to realize long-distance and large-capacity communication. In recent years, as a technique for realizing large-capacity optical fiber communication, a technique of performing signal equalization and demodulation using a coherent optical communication scheme and digital signal processing has been researched and developed. [0003] In a coherent optical communication scheme, the information to be transmitted is applied to one or both of the amplitude and phase of the light wave, and then transmitted. To receive information applied to amplitude or phase, the received light is mixed with local oscillator...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/61
CPCH04B10/6161H04B10/6163H04B10/6165
Inventor 福知清
Owner NEC CORP
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