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

Optical line terminal, optical network unit and optical communication system

A technology of optical line terminal and optical network unit, which is applied in the field of optical network to achieve the effect of improving power budget

Active Publication Date: 2017-06-30
ALCATEL LUCENT SHANGHAI BELL CO LTD
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in TWDM-PON, the ONU transmitter must have the ability to modulate the upstream information to any one of the four upstream wavelengths

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 line terminal, optical network unit and optical communication system
  • Optical line terminal, optical network unit and optical communication system
  • Optical line terminal, optical network unit and optical communication system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] Such as figure 2 As shown, the OLT includes a downlink transmitter, an uplink receiver, a seed light source, and a depolarizer. figure 2 Taking the implementation of TWDM by using multiple wavelengths as an example, the embodiment of the present invention is described in detail, that is, multiple downlink wavelengths and multiple uplink wavelengths are included, for example, four downlink wavelengths λ D1 ,λ D2 ,λ D3 ,λ D4 and four upstream wavelengths λ U1 ,λ U2 ,λ U3 ,λ U4 . It can be understood that other numbers of uplink wavelengths and downlink wavelengths are also applicable, and even this embodiment can be simplified to use only a single wavelength, that is, a single downlink wavelength and a single uplink wavelength.

[0047] More specifically, the downlink transmitters include transmitters Tx1, Tx2, Tx3 and Tx4, which respectively generate λ on the downlink wavelength modulated by the downlink communication D1 ,λ D2 ,λ D3 ,λ D4 downlink optical s...

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 ONU in the existing TWDM‑PON uses a tunable laser, which is costly. In addition, a symmetrical TWDM‑PON supporting long-distance 40Gb / s is required in the future. The present invention provides an optical line terminal, comprising: a seed light source, which is used for external injection of the optical network unit end to generate an uplink wavelength (λ Ui ); and a depolarizer for depolarizing the seed light, thereby eliminating the polarization dependence of the seed light source. The present invention also provides an optical network unit, including: a reflective optical amplifier for amplifying the received uplink wavelength (λ Ui ) on the seed light and the downlink optical signal carrying the downlink communication, and reflect the amplified optical signal to the uplink transmitter and downlink receiver of the optical network unit respectively; the wave division multiplexing unit is used for demultiplexing the amplified The downlink optical signal and the seed light; the downlink receiver (Rx), used to receive the demultiplexed downlink optical signal and restore the downlink communication; the uplink transmitter, the demultiplexed seed light external injection mode locking After that, the uplink wavelength (λ Ui ), the uplink optical signal modulated with uplink communication is output.

Description

technical field [0001] The invention relates to an optical network, in particular to a wavelength division multiplexing optical network based on a passive optical network. Background technique [0002] With the widespread application of advanced multimedia, such as 3D TV, telemedicine services, online games, and the development of interactive video learning applications, the demand for bandwidth has increased tremendously. Next-generation PON2 (NG-PON2), as a long-term evolution PON solution, is being discussed by the International Telecommunication Union Telecommunications Sector (ITU-T) and the Full Service Access Network (FSAN) as a hot topic. Most operators hope that NG-PON2 can provide larger bandwidth, higher splitting ratio, longer transmission distance and better access capability. Currently, ITU-T and FSAN are finalizing the requirements for NG-PON2 to increase the available bandwidth to 40Gb / s. [0003] Among the technical solutions that have been proposed, TWDM-...

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): H04J14/02H04Q11/00H04B10/40
Inventor 昌庆江黄喜
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD