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Method and device for alignment of return-to-zero modulating pulse and transmission data

A technology for transmitting data and modulating pulses, applied in the field of communication transmission, it can solve problems such as system performance degradation and inability to align RZ transmission data, and achieve the effect of improving performance

Inactive Publication Date: 2009-10-07
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In view of this, the main purpose of the embodiments of the present invention is to provide a return-to-zero code (RZ) modulated pulse alignment method and device, which solves the problem that the prior art cannot align the RZ modulated pulse with the transmission data, causing system performance degradation , which improves the performance of the transmission system

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  • Method and device for alignment of return-to-zero modulating pulse and transmission data

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Embodiment Construction

[0039] The technical solutions of the present invention will be described below in conjunction with specific embodiments.

[0040] The flow chart of a method for aligning RZ modulated pulses with transmission data provided by Embodiment 1 of the present invention is as follows Figure 5 shown.

[0041] Step 101, modulating and outputting a return-to-zero code modulated optical signal carrying transmission data.

[0042]An electrical clock signal is provided for the modulation process by a clock source. When the duty cycle of the RZ pulse is 1 / 2, the input electrical clock signal is the same as the baud rate, and the bias point of the Mach-Zehnder modulator works at the integration point; when the duty cycle of the RZ pulse is 1 / 3, the input The electrical clock signal is half the baud rate, and the Mach-Zehnder modulator bias point works at its highest point. When the duty cycle of the RZ pulse is 2 / 3, the input electrical clock signal is half of the baud rate, and the bias...

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Abstract

The invention relates to the field of communication transmission, in particular to a method and a device for alignment of return-to-zero modulating pulse and transmission data. The method comprises the following steps: modulating and outputting a return-to-zero modulating optical signal carrying transmission data; carrying out photoelectric conversion to the return-to-zero modulating optical signal, and then, filtering the obtained return-to-zero modulating electric signal to obtain a frequency component; and adjusting the return-to-zero modulating optical signal in a mode of time delay according to the size of the frequency component. The device comprises a return-to-zero modulating unit for modulating and outputting the return-to-zero modulating optical signal carrying the transmission data, a detecting unit for carrying out the photoelectric conversion to the return-to-zero modulating optical signal and filtering the obtained return-to-zero modulating electric signal to obtain the frequency component, and a control unit for adjusting the return-to-zero modulating optical signal in the mode of time delay according to the size of the frequency component. The invention solves the problem that the prior art can not align the RZ modulating pulse and data to cause the system performance to be poor, and improves the performance of transmission systems.

Description

technical field [0001] The invention relates to the field of communication transmission, in particular to a method and a device for aligning return-to-zero code modulation pulses with transmission data. Background technique [0002] The ever-increasing video services place higher demands on the capacity of the transmission network. At present, the main high-end line bearer rate of the optical transport network is 10Gb / s, and the high-end bearer line rate of the next-generation optical network is 40Gb / s, or a higher rate than 40Gb / s. At the same time, the capacity of Ethernet services is increasing at a rate of 10 times, and its bearer bandwidth requirements will also increase by a factor of 10. [0003] The optical line modulation pattern is very critical to the optical transmission system, and the choice of the pattern directly affects the transmission performance, spectral efficiency, nonlinear tolerance, and dispersion tolerance of the system. In the 10Gb / s optical tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/155H04B10/524
Inventor 徐晓庚
Owner HUAWEI TECH CO LTD
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