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ASK/DPSK hybrid modulation method, device and system

A hybrid modulation, one-way technology, applied in the field of optical network communication, can solve the problems of high cost of ONU-side devices, slow uplink signal rate, increased use overhead, etc., to achieve centralized control and management, easy to receive, and reduce costs. Effect

Inactive Publication Date: 2012-08-08
HUAWEI TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The contriver finds in the process of realizing the present invention, above-mentioned prior art one has following shortcoming at least: in actual application, ONU terminal device cost is higher, needs Mach-Zehnder Delayed Interferometer (MZDI, Mach-Zehnder Delayed Interferometer ) to demodulate the DPSK signal, plus the intensity modulator for secondary modulation, which adds a lot of overhead to the user
Since the upstream signal rate is generally slow, this means that the amount of MZDI is relatively long, which brings great challenges to the precision requirements of device manufacturing and is not conducive to integration.

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  • ASK/DPSK hybrid modulation method, device and system
  • ASK/DPSK hybrid modulation method, device and system
  • ASK/DPSK hybrid modulation method, device and system

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Embodiment Construction

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0040] In the ASK / DPSK hybrid modulation method, the extinction ratio of the ASK signal is limited for the correct demodulation and reception of the DPSK signal, and the device used for DPSK demodulation is MZDI, which uses the principle of optical coherence of two consecutive bits of signal, If the phase is consistent, it will be strengthened, and the phase difference π will be canceled, so that the phase information is converted into amplitude information, wh...

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Abstract

The invention relates to an ASK / DPSK hybrid modulation method. An optical line terminal (OLT) sends a downlink amplitude shift keying (ASK) modulation signal with uniformly inserted '1' codes to an optical network unit (ONU) and each inserted '1' code is smaller than a bit length of an uplink difference phase shift keying modulation (DPSK) signal; the ONU divides the downlink ASK modulation signal inserted with '1' codes into two paths; one path directly receives the ASK signal, and the other path modulates to generate the uplink DPSK signal which enters into a transmission link to be transmitted into the OLT which carries out modulation and receiving on the uplink DPSK signal. The invention also provides an ASK / DPSK hybrid modulation device and a system. In the embodiment of the invention, the scheme of inserting '1' codes is adopted to lead two successive bits which modulate the uplink DPSK signal are both '1' codes, thus the modulation effect is better, and the influence of inherent signal crosstalk of the ASK / DPSK hybrid modulation is inhibited; the influence of nonlinear effect is reduced, and the extinction ratio does not restrict the DPSK signal receiving, and the transmission performance of the system is greatly improved.

Description

technical field [0001] The invention relates to the technical field of optical network communication, in particular to an ASK / DPSK hybrid modulation method, device and system. Background technique [0002] Passive Optical Network (PON, Passive Optical Network) is an optical access network technology that has attracted more attention at present. It uses flexible wavelength division multiplexing and combines time division multiplexing technology to achieve a very high network capacity and resource utilization. considerable level. In recent years, with the gradual increase of access network traffic and the diversification of services, it has become a new research direction to introduce hybrid modulation technology into the PON framework. Its advantage is to use various signal coding superposition modulation technologies directly on the basis of wavelength division multiplex-passive optical network (WDM-PON, wavelength division multiplex-Passive Optical Network) to achieve inte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/34H04J14/02G02F2/00
Inventor 迟楠黄博操时宜
Owner HUAWEI TECH CO LTD
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