FSK modulating system based on smoothing modulator

A filter modulator and modulation system technology, applied in the direction of frequency modulation carrier system, etc., can solve the problems of unequal carrier frequency amplitude, low modulation rate, complex system, etc., and achieve the goal of ensuring stability, simple modulation mode, and lower bit error rate Effect

Inactive Publication Date: 2015-06-17
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

[0004] For the defects of the prior art, the object of the present invention is to provide a FSK modulation system based on a filter modulator, aiming at solving the problem of unequal carrier frequency amplitude, low modulation rate, high bit error rate and system complicated question

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  • FSK modulating system based on smoothing modulator
  • FSK modulating system based on smoothing modulator
  • FSK modulating system based on smoothing modulator

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0019] In order to overcome the shortcomings of the prior art above, the present invention provides an FSK modulation structure. This kind of structure can generate high-speed FSK signal, and the structure is simple.

[0020] In the embodiment of the present invention, the continuous light from the laser passes through the LiNbO 3 The modulation of the modulator produces a carrier imitation signal, which contains two subcarriers, and the subcarrier signal enters the filter modulator. The input interface of this device uses FBG optical fiber, which can not only play the role of filtering, but also ...

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Abstract

The invention discloses a FSK modulating system based on a smoothing modulator. By means of the system, continuous FSK optical signals can be generated to serve as optical labels or optical payload. The FSK modulating system comprises a laser, a LiNbO3 modulator, a random signal generator, a sinusoidal signal generator, two inverters and the smoothing modulator. The laser generates continuous laser, the laser enters the LiNbO3 modulator, and carrier-fictitious subcarriers are output under the drive of sinusoidal signals; the carrier-fictitious subcarriers enter a smoothing modulator module, modulation is conducted under the drive action of data signals, signal light of different frequencies and with intensity being coupled and symmetrical is obtained, and thus required FSK signals are obtained through coupling. According to the system, the FSK signals are obtained through the LiNbO3 modulator and the smoothing modulator module, and compared with an existing FSK modulation mode, the system has the advantages that signal modulation is stable, the influence of external factors is small, and the component amplitude difference of all frequencies is small, accordingly the signal transmission chromatic dispersion influence is small, and the integration level is high.

Description

technical field [0001] The invention belongs to the fields of optoelectronics and optical communication, and more specifically relates to an FSK modulation system based on a filter modulator. Background technique [0002] The main modulation formats in optical communication include: ASK (Amplitude Shift Keying, amplitude keying) modulation based on amplitude modulation, PSK (Phase Shift keying, phase keying) modulation based on phase modulation, FSK (Frequency Shift keying) based on frequency modulation , frequency keying) modulation, and polarization-based polarization modulation. Among them, FSK is a recently proposed modulation mode, because it has high transmission tolerance in the transmission process; the demodulation method of FSK signal only needs optical filters, and the advantages of convenient demodulation have attracted more and more people. s concern. [0003] The existing FSK modulation methods are: (1) Change the output frequency of the laser by adjusting th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/12
CPCH04L27/12
Inventor 罗风光杨柳李斌
Owner HUAZHONG UNIV OF SCI & TECH
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