Generation, conversion and converter for non-return-to-zero code with partial carrier inhibition

A non-return-to-zero code and carrier suppression technology, which is applied in the field of high-speed optical communication, can solve the problems of low spectral efficiency, reduced fiber nonlinear tolerance, and high cost, and achieve large nonlinear tolerance, reduced power cost, and good dispersion The effect of tolerance

Inactive Publication Date: 2006-03-15
PEKING UNIV
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Problems solved by technology

The main advantage of the RZ code format is high receiver sensitivity, but its disadvantages are wide spectral bandwidth, low dispersion tolerance, and low spectral efficiency.
The disadvantage is that when the system uses optical fiber with low dispersion value as the transmission medium, the CSRZ code is seriously affected by FWM crosstalk, and the nonlinear tolerance of the optical fiber is reduced
Moreover, the traditional device for generating RZ and CSRZ codes needs two electro-optic modulators, which has complex structure and high cost.

Method used

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  • Generation, conversion and converter for non-return-to-zero code with partial carrier inhibition
  • Generation, conversion and converter for non-return-to-zero code with partial carrier inhibition
  • Generation, conversion and converter for non-return-to-zero code with partial carrier inhibition

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Embodiment Construction

[0023] The structure of the device used to generate the CSNRZ code type optical signal proposed by the present invention is as follows: figure 1 shown. Wherein, the continuous light wave CW with stable power generated by the continuous wave laser is input to the input end of the push-pull electro-optic modulator module through the optical fiber transmission line. In optical communication systems, commonly used push-pull electro-optic modulators include electro-absorption modulators (EA modulators) and Mach-Zehnder modulators (MZ modulators). In the device for generating CSNRZ optical signal of the present invention, the double driving electrode type MZ modulator is preferably used. V bias Indicates the bias voltage of the modulator. In the present invention, the driving voltage of the modulator is provided by the NRZ electrical data signal generated by the electrical data signal generator. The pseudo-random code signal generator is a commonly used electrical data signal ge...

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Abstract

The invention comprises continuous-wave laser, pushpull electro optic modulator and electrical signal generator. With adjusting offset voltage, the bias point of modulator is set between midpoint value and minimum value of transmission function, and the continuous-wave is modulated by modulator driven by CSNRZ electrical signal to generate CSNRZ optical signal. The invention also offers a device that can convert CSNRZ optical signal to NRZ optical signal. Being different with RZ and CSRZ, '0'bit and '1' bit corresponding to CSNRZ coder pattern has opposite phase in sign that inhabits either carrier wave component of NRZ optical signal, or keeps good chromatic dispersion.

Description

technical field [0001] The invention relates to the technical field of high-speed optical communication, in particular to a method for generating and converting a partial carrier suppression non-return-to-zero code (CSNRZ) optical signal and a device thereof. Background technique [0002] In the field of optical transmission system research, high speed, large capacity, and long distance are the research goals and development directions. At the same time, the improvement of the line rate and the extension of the transmission distance have increased the requirements of the system for OSNR and aggravated the damage of the signal. In the research process of large-capacity long-distance transmission system, the selection of system amplification scheme, compensation scheme and modulation format is the core and focus of the research. [0003] In large-capacity long-distance optical transmission systems, the main factors that cause signal damage are amplified spontaneous emission n...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/155H04B10/158H04B10/548
Inventor 张德朝马云柱李正斌徐安士
Owner PEKING UNIV
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