Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Polarization-unrelated coherent light access method and system

An access method and access system technology, applied in the field of optical access network, can solve the problems of unrealized access network architecture, uplink channel transmission scheme design, complex dual-polarization IQ modulator, etc., and achieve simplified structure and low cost , to achieve a simple effect

Active Publication Date: 2019-02-19
WUHAN POST & TELECOMM RES INST CO LTD
View PDF8 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this solution requires the use of complex dual-polarization IQ modulators, and there is no design for the transmission scheme of the uplink channel, so a symmetrical access network architecture cannot be realized
Therefore, the current technical solutions have great limitations in practical application

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
  • Polarization-unrelated coherent light access method and system
  • Polarization-unrelated coherent light access method and system
  • Polarization-unrelated coherent light access method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] The present invention will be further described in detail below in conjunction with the drawings and embodiments.

[0047] The polarization-independent coherent optical access method of this embodiment is suitable for an optical access network system and includes the steps:

[0048] S1. The original signal is preprocessed in the OLT (optical line terminal, optical line terminal), so that in the time domain frame where the signal is located, the information signal and the 0 signal have an interleaved structure.

[0049] S2. Convert the preprocessed signal from a digital single-sideband signal to an analog electrical signal, and then use a single-polarization IQ modulator to achieve single-sideband modulation. Preferably, the bias point of the single-polarization IQ modulator can be adjusted to the zero point or the linear region.

[0050] S3. The above-mentioned single-sideband modulated signal is divided into two polarization states, and the optical signals in the two polarizat...

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 discloses a polarization-unrelated coherent light access method and system, and relates to the field of the optical access network in an optical fiber communication system. The method comprises the following steps: an optical line terminal OLT preprocesses an original signal, and realizes single side band modulation by utilizing a single-polarization IQ modulator; two sections of optical fiber polarization delay lines divide a single-polarization signal into two paths of dual-polarization signals unrelated to each other, and a downlink optical signal is sent after two paths of dual-polarization signals are combined; an optical network unit ONU mixes the downlink optical signal and the optical carrier, and performs the receiving through a photoelectric detector; an informationsignal and a 0 signal are of an interleaving structure in a time domain frame after preprocessing the original signal; the length difference between two sections of optical fiber polarization delay lines is corresponding to the length of the information signal or the 0 signal in the interleaving structure. The uplink-downlink symmetric and polarization-unrelated optical access network architecture is realized, the realization is simple, and the cost is low.

Description

Technical field [0001] The invention relates to the field of optical access networks in optical fiber communication systems, in particular to a polarization-independent coherent optical access method and system. Background technique [0002] With the increase of transmission capacity in optical fiber communication systems and the vigorous development of mobile Internet technology, higher requirements are put forward for the transmission distance, speed, and splitting ratio of the access network system. At present, most of the access network systems only support optical intensity modulation format and direct detection technology. However, this method limits the transmission rate because it modulates only in the dimension of intensity. At the same time, the direct detection technology also limits the receiving sensitivity, making the splitting ratio in the access network system unable to continue to increase. Therefore, coherent receiving technology is increasingly being applied ...

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
IPC IPC(8): H04B10/532H04B10/61
CPCH04B10/532H04B10/614
Inventor 王熹李响罗鸣
Owner WUHAN POST & TELECOMM RES INST CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com