Method of implementing precoding based modulator for carrier suppression return-to-zero optical signals

A technology of carrier suppression and implementation method, which is applied in the direction of electromagnetic wave transmission system, electrical components, transmission system, 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: 2006-07-26
SHANGHAI JIAO TONG UNIV
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of high cost and complexity in the implementation of existing CSRZ codes, and propose a single modulator implementation method based on precoded carrier suppression and return-to-zero optical signals, so that it can effectively reduce the cost of current CSRZ transmitters and complexity

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  • Method of implementing precoding based modulator for carrier suppression return-to-zero optical signals
  • Method of implementing precoding based modulator for carrier suppression return-to-zero optical signals
  • Method of implementing precoding based modulator for carrier suppression return-to-zero optical signals

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Embodiment Construction

[0018] Such as 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 pulse-weighted three-level 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 a carrier-suppressed normalized signal. Zero (CSRZ) optical modulation signal. The specific implementation steps are as follows:

[0019] (1) if figure 2 As shown, the realization of the precoding process involves 3dB power divider, phase shifter, XOR gate, analog subtractor and low-pass filter. The input half-rate clock (such as image 3 As shown in a) First, it is divided into two channels with the same power through a 3dB power divider (which can be implemented directly on the PCB or adopts Picosecond’s Model5331), and one of...

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Abstract

This invention relates to single modulator realization method based on pre-coding load wave suppression zero in fiber communication technique field, which comprises the following steps: A, forming impulse weighted three-level signals through pre-coding processing by input data and simultaneous semi-time signal; b, pre-compiling to generate three level signal through amplifying and driving to enlarge the signal to peak to peak value as two times of modulator TV voltage; c, modulating the three-level signal to light load wave through light modulation relative to three-level signal zero and the light signal zero phase on and relative to one or -1 to realize the load suppression zero modulation signals.

Description

technical field [0001] The present invention relates to a method in the technical field of optical fiber communication, in particular to a single modulator implementation method based on precoded carrier suppression and return-to-zero optical signal. Background technique [0002] With the development of optical fiber communication technology, many kinds of modulation formats have been used to improve the system's tolerance to optical fiber dispersion and nonlinearity. Non-Return-to-Zero (MRZ), Return-to-Zero (RZ) and Carrier Suppressed Return-to-Zero (CSRZ) are currently the three most widely used codes. From the perspective of system performance, NRZ codes have the strongest dispersion tolerance for optical fibers, but the weakest nonlinear tolerance; RZ codes have the strongest nonlinear tolerance for optical fibers, but at the expense of dispersion tolerance, its dispersion The accommodation capacity is the weakest; while the CSRZ code has the best optimization in terms ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/155H04B10/516
Inventor 董毅胡卫生
Owner SHANGHAI JIAO TONG UNIV
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