Method and device for realizing direct detection and coherent detection

A coherent detection, direct technique, applied in the field of communication

Inactive Publication Date: 2011-08-03
江苏科利新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there are only methods and devices for direct detection of DQPSK or DPSK alone, or coherent detection ...

Method used

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  • Method and device for realizing direct detection and coherent detection
  • Method and device for realizing direct detection and coherent detection
  • Method and device for realizing direct detection and coherent detection

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Embodiment Construction

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0029] An embodiment of the present invention provides a device for realizing direct detection and coherent detection, such as figure 1 shown, including:

[0030] a receiving unit 11, configured to receive an optical signal;

[0031] The optical splitter 12 is used to divide the optical signal received by the receiving unit 11 into a first optical signal and a second optical signal, the first optical signal is sent to the power distribution unit 13, and the second...

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Abstract

The invention provides a method and device for realizing direct detection and coherent detection. The method comprises the steps of: firstly, dividing received optical signals into a first path of optical signals and a second path of optical signals, carrying out power allocation on the first path of optical signals to obtain a first optical signal and a second optical signal, and carrying out polarization splitting on the second path of optical signals to obtain a first optical signal and a second optical signal; secondly, selecting an optical signal subjected to output power allocation or an optical signal subjected to output polarization splitting according to a received control signal; and finally, carrying out direct detection or coherent detection on the output optical signal. Power allocation or polarization splitting is carried out on the optical signal according to the control signal, and direct detection or coherent detection can be flexibly carried out to ensure that a single-polarization or polarization multiplexing system can adapt to different rates of an intermediate node.

Description

technical field [0001] The present invention relates to communication technology, in particular to a method and device for realizing direct detection and coherent detection. Background technique [0002] At present, in order to improve optical fiber transmission efficiency and spectrum efficiency, different modulation formats need to be used. For example, more important modulation formats include DPSK (Differential Phase Shift Keying, differential phase shift keying), QPSK (Quadrature Phase Shift Keying, quadrature phase shift keying) control) or PDM-QPSK (Polarization Division Multiplexing-QPSK, polarization multiplexed quadrature phase shift keying), etc. type requires coherent detection. [0003] Direct detection is the process of sending the received optical signal directly into the photodetector to obtain a useful signal; while coherent detection is the process of mixing the local oscillator signal with the received optical signal to obtain a useful signal. Compared w...

Claims

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Application Information

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IPC IPC(8): H04B10/152H04B10/142H04L27/227H04L27/233H04B10/60
CPCH04J14/06H04J14/002H04J14/0221H04B10/60
Inventor 方圆圆李良川
Owner 江苏科利新材料有限公司
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