An optical differential polarization shift key control system and its signal transmission device and method

A polarization shift keying and optical signal technology, applied in the field of optical transmission system, can solve the problems of increasing system complexity and cost

Active Publication Date: 2010-12-08
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, at least two modulators are required, and polarization state tracking control needs to be performed at the receiving end. Although this reflects the advantages of polarization interleaved modulation, it increases the complexity and cost of the system.

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  • An optical differential polarization shift key control system and its signal transmission device and method
  • An optical differential polarization shift key control system and its signal transmission device and method
  • An optical differential polarization shift key control system and its signal transmission device and method

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Embodiment Construction

[0033] Various preferred embodiments of the present invention will be described in detail below.

[0034] Such as Figure 4 As shown, the present invention adopts optical differential polarization shift keying signal transmission device, including polarization modulator 315, light source 314, precoder 310, clock square wave generator 311, exclusive OR gate 312 and driver 313;

[0035] The light source 314 is used to generate the optical carrier signal; the precoder 310 is used to differentially encode the original input data signal L1 to obtain the differentially encoded electrical signal L2; the clock square wave generator 311 is used to generate the clock square wave signal L3; the exclusive OR gate 312 is used to perform XOR calculation on the differentially encoded electrical signal L2 and the clock square wave signal L3 to obtain the XOR electrical signal L4; the driver 313 is used to amplify the XOR electrical signal L4 and send the amplified electrical signal to the pol...

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Abstract

The invention discloses a light differential polarization displacement keying system and a signal transmitting device as well as a method thereof. The method comprises the steps of: firstly, conducting differential encoding on an originally input data signal to obtain an electrical signal of differential encoding; then conducting Exclusive Or calculations on the electrical signal of differential encoding and a clock square signal, to obtain an Exclusive Or electrical signal; and finally using the Exclusive Or electrical signal as the driving signal of a polarization modulator, modulating a light carrier signal transmitted by a light source to obtain a differential polarization offset keying modulation signal of polarization interpolation. Only by using one polarization modulator, the invention realizes polarization interpolation and differential polarization offset keying modulation at the same time; furthermore, by adopting the differential pre-coding at a sending terminal, the invention can do receiving at the receiving terminal with no need for polarization tracking, and therefore reducing the cost and complexity of the system.

Description

technical field [0001] The invention relates to an optical transmission system, in particular to an optical sending device adopting polarization interleaved modulation, a method and a system thereof. Background technique [0002] A dense wavelength division multiplexing (Dense Wavelength Division Multiplexing, DWDM for short) optical transmission system transmits signals of multiple wavelengths in an optical fiber, and has a large transmission capacity. In the DWDM transmission system, if the polarization modulation optical transmission system is used, the receiver sensitivity is about 3dB better than that of the on-off keying (OOK) optical transmission system due to the constant signal strength; and it is less affected by the Kerr nonlinear effect of the optical fiber. Therefore, it is beneficial to prolong the transmission distance of the optical transmission system. [0003] However, the polarization state of the optical signal changes randomly due to various factors suc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/135H04J14/02H04B10/25
Inventor 周伟勤施社平王泰立王向前吴杰陈雪
Owner ZTE CORP
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