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Single modulator realization method for CSRZ-DPSK

An implementation method and phase modulation technology, applied in electromagnetic wave transmission systems, electrical components, transmission systems, etc., can solve the problems of high cost and complexity of implementation, and achieve the effects of easy integration, simple implementation, and reduced cost and complexity

Inactive Publication Date: 2006-10-11
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to propose a single modulator implementation method based on precoded CSRZ-DPSK optical signals for the high and complex problems of the existing CSRZ-DPSK modulation format, so that it can effectively reduce the current CSRZ-DPSK modulation format. Transmitter cost and complexity

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  • Single modulator realization method for CSRZ-DPSK
  • Single modulator realization method for CSRZ-DPSK
  • Single modulator realization method for CSRZ-DPSK

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Embodiment Construction

[0018] like figure 1 As shown, the components used in the embodiments of the present invention relate to precoders, lasers, Mach-Zehnder optical modulators and drivers. The precoder processes the input data and the half-rate clock to form a phase-modulated half-rate clock signal, which is sent to the driver for amplification, and then input to the radio frequency (RF) port of the Mach-Zehnder optical modulator to modulate the optical carrier to form CSRZ-DPSK light modulation signal. The specific implementation steps are as follows:

[0019] (1) if figure 2 As shown, the implementation of the precoding process involves phase shifters, XOR gates and low-pass filters. The input half-rate clock (such as image 3 As shown in a) first adjust the delay through the phase shifter (which can be implemented directly on the PCB or use Micronetics' 4305) to make the pulse center moment and the input data (such as image 3 After the central moment of b) is aligned, the XOR operation ...

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Abstract

The implementation method for a CSRZ-DPSK single modulator comprises: 1) taking code pre-treatment to the input data and synchronous semi-speed clock signal to form phase-modulated semi-speed clock signal; 2) driving the former signal to amplify the small-amplitude signal with V pi voltage as two times to peak-teak value; 3) mapping signal into light carrier by optical modulation to form CSRZ-DPSK sequence that jumps ' pi' phase when input '0' or not when input '1'. This invention can reduce cost and complexity.

Description

technical field [0001] The invention relates to a method in the technical field of optical fiber communication, in particular to a method for realizing carrier suppression return to zero-differential phase shift keying (CSRZ-DPSK) optical modulation signal by single optical modulation. Background technique [0002] With the development of optical fiber communication technology, many new modulation formats have been used to improve the system's tolerance to optical fiber dispersion and nonlinearity. In recent years, two modulation formats based on differential phase shift keying (DPSK) have been introduced into the optical fiber In the field of communication, since this modulation format can obtain a 3dB enhancement of receiving sensitivity through differential reception (in a linear system, it means that the transmission distance can be doubled), and it shows a very superior tolerance to optical fiber nonlinearity, Effectively improve the transmission capacity of the optica...

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Application Information

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IPC IPC(8): H04B10/155H04B10/516
Inventor 董毅何浩苏翼凯胡卫生
Owner SHANGHAI JIAO TONG UNIV
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