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

Hybrid TWDM-PON system of downlink DPSK modulation and uplink direct modulation

A TWDM-PON, direct technology, applied in the field of optical communication, can solve the problems of low cost, increase the cost of ONU transmitter, etc., achieve the effect of reducing cost, easy to upgrade and improve the transmission optical power

Inactive Publication Date: 2013-12-25
SHANGHAI JIAO TONG UNIV
View PDF2 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual implementation of the TWDM-PON system for high-speed uplink and downlink transmission, there are the following problems that need to be solved urgently: first, the realization of low-cost, high-performance colorless optical network unit; Dispersion tolerance problem caused by the increase of transmission distance
In addition, the transmitter of the ONU (Optical Network Unit, Optical Network Unit) in this structure is composed of a laser and an external modulator, which increases the cost of the ONU transmitter

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
  • Hybrid TWDM-PON system of downlink DPSK modulation and uplink direct modulation
  • Hybrid TWDM-PON system of downlink DPSK modulation and uplink direct modulation
  • Hybrid TWDM-PON system of downlink DPSK modulation and uplink direct modulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0043] The present invention fully utilizes the directly modulated laser with tunable wavelength as the uplink high output power transmitter, improves the power budget of the uplink transmission of the PON system, reduces the cost of the uplink transmitter, and realizes the high-speed colorless transmitter of the ONU at a lower cost module; at the same time, the present invention makes full use of DPSK signals as downlink data signals, which improves the problem of anti-dispersion tolerance of down...

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 hybrid TWDM-PON system of downlink differential phase shift keying (DPSK) modulation and uplink direct modulation. The system comprises an optical line terminal, a feed line type optical fiber and a passive optical network system. The passive optical network system includes a remote node, distributed optical fibers and optical network units (ONU). The optical line terminal is connected to the remote node via the feed line type optical fiber, and the remote node is connected to the optical network units via the distributed optical fibers. According to the system, the downlink adopts DPSK modulation signals to improve downlink dispersion tolerance, and the uplink uses a direct modulation laser with tunable wavelength as an emitter, and thus a high-speed emission module of the ONU is realized at a low cost. Meanwhile, a periodic filter is disposed in each ONU to realize the demodulation of the downlink signal DPSK and the chirp management of the uplink signals, and thus the system cost is reduced, the dispersion tolerance of the PON system is improved, and the transmission distance of the system is increased. The hybrid TWDM-PON system is easy to realize, and can be completely compatible with a PON system based on time division multiplexing.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a passive optical network transmission system based on a periodic filter to realize low-cost, high-dispersion tolerance hybrid wavelength division and time division multiplexing. Background technique [0002] With the emergence of a large number of new services, such as ultra-high-definition HDTV, large file sharing, cloud storage, social networking, etc., end users have higher and higher requirements for the uplink and downlink bandwidth of the access network. The system cannot meet the needs of future users. Therefore, in order to further improve the transmission capacity of the access network system, and meet the bandwidth requirements of users in the longer term. IEEE and ITU-T FSAN formulated the standard direction of NG-PON2, proposed to study a new type of PON system, and determined that time division multiplexing and wavelength division multiplexing passive...

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): H04Q11/00H04J14/02H04B10/516
Inventor 毕美华肖石林何浩义理林李军胡卫生
Owner SHANGHAI JIAO TONG UNIV
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