Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for on-line monitoring defect of phase shift keying signal generated by electro-optical modulator

An electro-optical modulator and phase-shift keying technology, applied in transmission monitoring/testing/fault measurement systems, electrical components, electromagnetic wave transmission systems, etc., can solve problems such as the influence of light source power fluctuations

Inactive Publication Date: 2008-10-01
TSINGHUA UNIV
View PDF7 Cites 33 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The above methods measure the absolute value of optical power, which is easily affected by the fluctuation of light source power. In order to solve this problem, a method with greater dynamic monitoring sensitivity is proposed.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for on-line monitoring defect of phase shift keying signal generated by electro-optical modulator
  • Method for on-line monitoring defect of phase shift keying signal generated by electro-optical modulator
  • Method for on-line monitoring defect of phase shift keying signal generated by electro-optical modulator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0047] Figure 6 A diagram showing an on-line monitoring system 600 for a phase-shift keying signal defect generated by an electro-optical modulator according to an embodiment of the present invention. The online monitoring system 600 includes: a laser 610, a first coupler 620, a modulator group 630 (may include one or more modulators, such as an intensity modulator cascaded with a phase modulator), a second coupler 640, a third coupler 650 , a digital-to-analog converter 660 , a sampling and analog-to-digital converter 670 , a detector 680 , and a processor 690 .

[0048] Wherein, the laser 610 is used to emit laser light. Those skilled in the art should understand that the wavelength of the light source is not limited to the wavelength of the signal light, and can also be other wavelengths, and it is not limited that the light output from the light source...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method and a device for monitoring electro-optic modulator generating phase shift keying signal defect. The method includes: partial light before modulation and light after modulation which come from same light source are wave combined; average light power of wave combined light is measured by using low-speed light; maximum value and minimum value of wave combined light average light power is recorded, and ratio of the maximum value to the minimum value is calculated as indicatrix of phase shift keying signal multi-defect. The device and method provided by the invention have no element sensitive to signal unrelated physical quantity; have simple structure and low cost; and can eliminate effect of light source power.

Description

technical field [0001] The invention relates to a defect monitoring method and a measuring device for a phase-shift keying signal generated by an electro-optic modulator, in particular to a defect monitoring method and a device for using a high-speed phase-shift keying signal used in high-speed, large-capacity optical communication. Background technique [0002] With the continuous surge of information and communication demands, the requirements for long-distance and high-capacity optical transmission systems are increasingly urgent. Phase-shift keyed signals are the preferred signal format in such systems due to their excellent immunity to noise and other transmission impairments, and also form the basis for other advanced modulation format signals. At present, various phase-shift keying signals are generated by electro-optic phase modulators or Mach-Zehnder intensity modulators, but due to device aging, environmental changes, etc., the generated phase-shift keying signals ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/08H04B10/12H04B10/07
Inventor 闻和姜欢冯勇郑小平张汉一郭奕理周炳琨
Owner TSINGHUA UNIV