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Coherent detection implementation device, system and method

A technology of coherent detection and coherent receiver, applied in the field of optical communication, can solve the problems of narrow line width, high price and high cost of coherent detection system of local oscillator laser

Active Publication Date: 2020-03-06
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to reduce the phase noise, the line width of the local oscillator laser is also required to be extremely narrow, resulting in high cost and expensive coherent detection system

Method used

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  • Coherent detection implementation device, system and method
  • Coherent detection implementation device, system and method
  • Coherent detection implementation device, system and method

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Embodiment Construction

[0052] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0053]In order to reduce the cost of the system, in the coherent detection system, a part of the modulated signal can be used as local oscillator light after data erasure by certain technical means, thus saving the local oscillator laser. However, this solution requires the introduction of additional envelope detectors, semiconductor optical amplifiers, and narrow-band optical filters, which increases the complexity and cost of the system, and it is also difficult to completely erase the modulated signal. In addition, since the polarization state of signal light is random after it is transmitted through ordinary optical fibers, coherent receivers usually use figure 1 The polari...

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Abstract

The embodiment of the invention discloses a coherent detection implementation device, system and method, and the device comprises a first receiving and transmitting unit which is used for transmittinga first-direction optical signal to second equipment, wherein the first-direction optical signal comprises a DC first-wavelength optical signal and a modulated second-wavelength optical signal and receiving a second direction optical signal from a second device, the second direction optical signal comprising the modulated first wavelength optical signal; and a first coherent receiver which is connected with the first transceiving unit and is used for taking one part of direct-current first-wavelength optical signals in the first-direction optical signals as coherently-received local oscillation light, carrying out coherent frequency mixing on the coherently-received local oscillation light and the second-direction optical signals and demodulating the second-direction optical signals. In the embodiment of the invention, a local oscillator laser for coherent reception is saved, and the cost and the complexity of coherent detection are reduced.

Description

technical field [0001] The present application relates to but is not limited to the field of optical communication technology, and especially refers to a device, system and method for implementing coherent detection. Background technique [0002] At present, coherent detection technology has become an important development direction of optical communication systems. Power budget and cost are two important considerations in building an optical communication system. Due to the introduction of local oscillator (Local Oscillator, LO) light, the use of coherent detection technology can significantly improve the receiving sensitivity of the system and reduce the power requirements for receiving signal light, thereby alleviating the bandwidth and power limitations of traditional optical communication systems. [0003] The main components of the coherent receiver specified in the Optical Internetworking Forum (OIF) standard are as follows figure 1 shown. For coherent detection sy...

Claims

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Application Information

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IPC IPC(8): H04B10/61H04B10/63
CPCH04B10/615H04B10/6151H04B10/63H04B10/64H04B10/506H04B10/2587H04B10/40H04B10/65H04B10/614H04B10/516H04B10/572
Inventor 涂芝娟张俊文黄新刚李明生
Owner ZTE CORP
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