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

Optical transmitting system and method

A transmission system and optical transmission technology, applied in the field of information transmission and optical fiber communication, can solve the problems of large volume and complicated control

Active Publication Date: 2010-09-29
ZTE CORP
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Two-level modulation requires two sets of modulators and drivers, especially when the two-level modulators use MZ modulators, the volume is large and the control is complicated

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
  • Optical transmitting system and method
  • Optical transmitting system and method
  • Optical transmitting system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] The core of the present invention is to generate RZ optical duobinary code through single-level modulation, and the specific transmission system, such as figure 2 As shown, it includes laser source 1, clock 2, RZ duobinary encoding module 100, and modulation module 200, the input signal of which is NRZ data. Among them, the RZ dual binary encoding module 100 includes a differential precoder 110, a dual binary three-level encoding unit 120, a multiplier 130, and a phase shifter 140; the modulation module 200 includes a signal drive amplifier 21 and an MZ modulator 14; Clock 2 can be generated by an internal clock device, or can be an external clock input with a frequency equal to the data bit rate.

[0035] The key to the system is the single-level modulation method to generate the return-to-zero RZ optical duo-binary code, specifically: the data signal NRZ is first differentially pre-encoded, and then the three-level encoding becomes an electrical NRZ duo-binary three-leve...

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 present invention relates to an optical transmission system and a method. Wherein, the system comprises a light source (1), a modulation module (200) connected with the light source (1) and a RZ duo-binary encoding module (100) on its control terminal. The method includes steps below: Receiving NRZ data input; conducting pre-coding and encoding for NRZ binary system into NRZ duo-binary system; using a multiplier and a phase shift clock signal to converter electric NRZ binary signals into electric RZ duo-binary signals; modulating light carriers for the electric RZ duo-binary signal to output optical RZ duo-binary signals. The system and the method realizes single-stage modulation to modulate a MZ modulator while an electric domain is converted into a three-level RZ signal and has a smaller system size and more simple control method compared with those of conventional two-stage modulation method.

Description

Technical field [0001] The invention relates to information transmission and optical fiber communication, in particular to an optical transmission system and a method thereof. Background technique [0002] The dense wavelength division multiplexing DWDM optical transmission system transmits signals of multiple wavelengths in the optical fiber, and the transmission capacity is very large. Traditional DWDM transmission usually uses binary amplitude modulation formats such as non-return-to-zero code NRZ or return-to-zero code RZ. As the frequency band utilization increases, such as to 0.8b / s / Hz, the crosstalk between the channels of NRZ and RZ systems Distortion becomes serious, restricting the further increase of transmission capacity. In a DWDM system with a single channel rate of 40Gb / s, the NRZ and RZ modulation formats are very sensitive to dispersion, and the dispersion compensation of the system is required to be accurate, otherwise long-distance transmission cannot be reali...

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 Patents(China)
IPC IPC(8): H04B10/12H04J14/02H04B10/50
Inventor 周伟勤施社平葛超张立昆
Owner ZTE CORP