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Optical line terminal and optical fiber access system with increased capacity

By applying the optical Fourier transform technology of the time lens principle in the PON system, the TDM signal is converted into a WDM signal, which solves the problem of PON system capacity exhaustion, realizes an efficient optical fiber access system, and improves the data rate and capacity. , and reduce energy consumption and costs.

Active Publication Date: 2020-06-26
DANMARKS TEKNISKE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of P2P WDM-PON is the large number of ports, the transmitter and terminal of the central office (CO) need more CO space and operation cost

Method used

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  • Optical line terminal and optical fiber access system with increased capacity
  • Optical line terminal and optical fiber access system with increased capacity
  • Optical line terminal and optical fiber access system with increased capacity

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0103] The currently disclosed time-lensing PON method has been experimentally proven. Using a single-carrier OOK transmitter and a low-cost 10GHz APD-based receiver, it is possible to achieve 40Gbit / sPON downlink transmission over 150-km 40-split unamplified SMF equipment, resulting in BER=3x10 -6 A power budget of 51.5dB (35.5dB / ch) has been achieved in the case of a 100km 64split unamplified fiber optic device using optical TDM technology in the same system, showing outstanding performance in terms of wavelength control and system capacity. The flexibility and expandability of the scheme of the present invention.

[0104] Principle and Experimental Setup

[0105] exist Figure 3A An example of the currently disclosed OLT structure / PON architecture is shown in , and this setup is used in this example 1. In an optical line terminal (OLT), a single-carrier TDM transmitter generates a high-speed TDM signal, which is then converted into multiple low-speed WDM channels using a ...

example 2

[0113] In this example, the scalability of currently disclosed solutions is investigated and 128 × 2 Gb / s over a 100-km unamplified SMF device is demonstrated using 200 m of highly nonlinear fiber (e.g., HNLF from OFS) WDM PON downlink transmission. Although all 128 generated WDM channels achieved sub-10 -3 Forward error correction (FEC) limited BER, but bandwidth limitation of HNLF can be observed, which will limit the scalability of the proposed scheme. To overcome this problem, the use of AlGaAs-on-insulator (AlGaAsOI) nonlinear waveguides [6,7] to implement temporal lenses has been studied. demonstrated the same 128×2Gb / s WDM PON system using AlGaAs devices, which achieved similar performance to HNLF, but showed no signs of reaching the bandwidth limit.

[0114] Principle and Experimental Setup

[0115] The principle is the same as shown in Figure 3a. In OLT, a single TDM transmitter generates a high-speed TDM signal, which is then converted into multiple low-speed WDM...

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Abstract

The present disclosure relates to an optical fiber access system based on passive optical networks. In particular the present disclosure relates to a PON system with increased capacity and a method for increasing the capacity in a PON system. One embodiment relates to an optical line terminal for a passive optical network, comprising at least one transmitter for generating a time division multiplexed (TDM) downstream optical data signal, a first time lens optical signal processor configured to convert the downstream TDM signal to a downstream WDM signal for distribution to a plurality of users, and at least one receiver for receiving and processing an upstream signal from said users.

Description

[0001] The present disclosure relates to an optical line terminal that can be used in a passive optical network based optical fiber access system. The present disclosure also relates to PON systems with increased capacity and methods for increasing capacity in PON systems. Background technique [0002] Rising data consumption by fixed and mobile broadband users is driving the industry to innovate to meet this challenge. Currently, many network operators are deploying passive optical network (PON) based fiber access systems on a mass market scale. PON systems are often referred to as the "last mile" between Internet service providers and individual users, that is, PON systems are usually used to provide fiber optics to end customers, usually using a point-to-multipoint architecture, where there are no powered fiber optic beam splitters Can be used to enable a single fiber to serve multiple endpoints. Endpoints are usually individual users, not commercial distributors. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J14/02
CPCH04J14/0223H04J14/0209H04J14/0246H04J14/0267
Inventor 关鹏宇L·K·奥克森洛
Owner DANMARKS TEKNISKE UNIV
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