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

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...

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

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