Sudden clock recovery method for dynamic optimal regulation at receiver in passive optical network

A passive optical network, dynamic optimization technology, applied in electromagnetic receivers, electromagnetic wave transmission systems, digital transmission systems, etc., can solve the problems of taking out the clock signal, high power consumption, complex structure, etc., to achieve small locking time, power consumption, etc. Small, simple structure

Inactive Publication Date: 2011-01-19
SHANGHAI MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the clock signal cannot be directly taken out by the injection lock-in oscillator
The existing clock recovery methods for multi-level amplitude modulation have their disadvantages: complex structure and high power consumption
However, there are no published patents or published papers mentioning the use of its spectral properties for clock recovery

Method used

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  • Sudden clock recovery method for dynamic optimal regulation at receiver in passive optical network
  • Sudden clock recovery method for dynamic optimal regulation at receiver in passive optical network
  • Sudden clock recovery method for dynamic optimal regulation at receiver in passive optical network

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Embodiment Construction

[0028] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0029] During the concrete realization of the scheme of the present invention, we simulated and calculated the following situation: the data signal of the non-return-to-zero code of the multilevel amplitude modulation is sent by the direct modulation laser, received by the optical detector, and then attenuated by a band-pass filter Some distractions and noise. Thereafter, the signal is amplified by the amplifier and then input to the injection-locked oscillator. We control the signal strength input to the injection lock oscillator by controlling the gain of the amplifier. Through simulation calculation, we know that the locking time of the injection-locked oscillator and the clock jitter after locking are related to the strength of the injected...

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Abstract

The invention discloses a sudden clock recovery method for the dynamic optimal regulation at a receiver in a passive optical network when multistage amplitude modulation is used. The method is as follows: a received optical signal in an optical receiver positioned in an optical line terminal is converted into an electric signal by an optical detector and a transimpedance amplifier; and the electric signal is the inputs of subsequent 3 circuit links, wherein 2 circuit links generate a clock signal through an injection locked oscillator, and the injection intensity of the two circuit links are regulated automatically and dynamically. Compared with other clock recovery schemes under a condition of adopting non-return-to-zero-codes for multistage amplitude modulation, the scheme with a simplestructure has the advantages of low power consumption and small occupation of chip area. The distinctive dynamic regulation function of the method can achieve short locking time and light after-locking clock vibration at the same time.

Description

Technical field: [0001] The invention relates to a clock recovery technology in a passive optical network, in particular to a burst clock recovery method dynamically optimized and adjusted at a receiving end when multi-level amplitude modulation is used in a passive optical network. Background technique: [0002] my country is a big country in network communication. In 1998, a large-capacity optical fiber communication trunk line transmission network with 22 optical cable trunk lines and a total length of 33,000 kilometers was built. However, the access network from the backbone network to individual users becomes a data transmission bottleneck. At present, the passive optical network has become the first choice for the access network, and its applications include fiber-to-the-building and fiber-to-the-home, etc. [0003] For the network architecture of passive optical network, see figure 1 . The optical fiber line terminal is placed at the operator's end. The optical ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00H04B10/158H04B10/66
Inventor 阎敏辉施伟锋
Owner SHANGHAI MARITIME UNIVERSITY
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