Light modulation system and method thereof
A light modulation and light source technology, applied in the transmission system, electromagnetic wave transmission system, electrical components, etc., can solve the problems of high driving voltage, difficult integration, polarization sensitivity, etc., and achieve the effect of low cost and small size
Active Publication Date: 2016-11-16
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology
The modulator usually has a relatively high driving voltage, is sensitive to polarization, and is difficult to integrate with optical devices such as light sources
Method used
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[0039] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0040] Such as figure 2 As shown, the light modulation system includes: a light source, and
[0041] Coding module 22: controlling and connecting to the modulation module, used to transform the non-return-to-zero coded data input into the required two-way intensity modulation driving electrical signals;
[0042] Optical branching module: its input terminal is connected to the light source, and its output terminal is connected to the modulation module, which is used to branch the light source into at least two paths;
[0043] Modulation module: its input end is connected to the optical branching module, and its output end is connected to the phase shifting module, which ...
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The invention discloses an optical modulation system and a method thereof. The system includes: a light source, an encoding module: controlling and connecting to a modulation module; an optical branching module: its input end is connected to a light source, and its output end is connected to a modulation module; the modulation module : its input end is connected to the optical splitting module, its output end is connected to the phase shifting module; phase shifting module: its input end is connected to the modulation module, and its output end is connected to the optical combining module; The phase shifting module is described above, and its output end is connected to an optical transmission line. The optical modulation system and method provided by the present invention modulate the EA modulator after converting the electrical domain into a two-level NRZ signal to realize single-level intensity modulation, and combine with a phase shifter to form an optical duobinary modulation with different phase information Signal. In addition, compared with the modulation system and method for generating optical duobinary modulation by a single-stage MZ modulator, the product structure of the optical modulation system and method provided by the present invention is easier to integrate, smaller in volume, and lower in cost.
Description
technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to an optical modulation system and its method, in particular to an optical binary code pattern modulation system and its method. Background technique [0002] With the continuous improvement of the data rate of the optical communication system and the widespread use of EDFA, the dispersion becomes an important factor restricting the transmission distance. A narrow-band, high-dispersion-tolerant format is sought to replace the traditional binary transmission format. [0003] Non-return to zero coding (Not Return to Zero, NRZ), the traditional binary transmission format is generally binary NRZ format, when the signal of this modulation format is transmitted in the optical fiber medium, due to the DC frequency component of the signal and the high frequency that occurs during the modulation process The expansion of components will stimulate nonlinearity and dispers...
Claims
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IPC IPC(8): H04B10/516
Inventor 陈雪石玥刘岩王立芊张治国
Owner BEIJING UNIV OF POSTS & TELECOMM