CN101487967A - Optical SSB modulation method used for X waveband - Google Patents
Optical SSB modulation method used for X waveband Download PDFInfo
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- CN101487967A CN101487967A CNA2009100793869A CN200910079386A CN101487967A CN 101487967 A CN101487967 A CN 101487967A CN A2009100793869 A CNA2009100793869 A CN A2009100793869A CN 200910079386 A CN200910079386 A CN 200910079386A CN 101487967 A CN101487967 A CN 101487967A
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Abstract
The invention discloses a light single sideband modulating method for an X wave band. The invention is mainly characterized in that: an electro-optical modulator is adopted to modulate the laser of 1550nm with a microwave signal (around 10Ghz) of the X wave band and then output a double sideband modulating signal. The modulator is connected with an Etalon Reference filter with the transmission band period of 100Ghz, the sideband falling in the range of the transmission bands of the filter is retained, and the other sideband falling in the range of stop-band fails to pass. The output signal after passing through the filter is the single sideband modulated electro-optical signal.
Description
Technical field
The present invention relates to a kind of method that is used for the laser single-sideband modulation of X-band.
Background technology
In fields such as communication, sensings, need carry out electrooptical modulation to the electric signal of the information of carrying, be modulated to optical frequency and use Laser Transmission again.It is the LiNbO of Mach-Zehnder form that structure is adopted in the modulation of light signal
3Electrooptic modulator.Because the needs of using have produced the whole bag of tricks relevant with modulation.In optical fiber telecommunications system, the notion of monolateral band (SSB) modulation is suggested and has obtained widespread use.This modulator approach has reduced the loss of luminous power, has reduced the dispersion phenomenon that produces owing to a plurality of frequencies of light signals of transmission, thereby information is transmitted more accurately.
In order to realize single-sideband modulation, will curb a sideband of modulation back light wave by optical device, keep another sideband.The specific implementation method has a lot, the most frequently used method is by the method with frequency and difference frequency signal to be divided into two-way to modulate, signal after the modulation is being synthesized, if a band components of two-way modulation signal is reverse, another band components in the same way, a band components after so synthetic will be cancelled, and another band components is retained.
Though this method can realize monolateral band transmission in theory, yet because the duty of two actual devices is difficult to keep identical, so actual modulation effect is often unsatisfactory.And the system behind the employing dual-modulator is complicated more, and device cost has also increased a lot.Therefore many new methods are suggested.
Summary of the invention
Fundamental purpose of the present invention is exactly in conjunction with the development level of present photoelectric device and the frequency characteristic of X-band microwave signal, adopts thermally-stabilised optical filter to the signal filtering after modulating, thereby realizes single-sideband modulation.
This method has been utilized the frequency characteristic of wave filter, adopt a modulator and wave filter make up just can be more satisfactory the realization single-sideband modulation.Basic skills is to allow double-side band light signal after the electrooptic modulator modulation by wave filter, and the frequency characteristic by designing filter makes a sideband pass through, and another sideband is suppressed.The signal of output is exactly the light signal that only keeps the single-sideband modulation of a sideband.
Wave filter is photo-thermal stable filter (Athernal Etalon Reference filter).For the modulation of the X-band signal about 10GHz, because being band connection frequency, the characteristics of this wave filter have periodically, need to set passband and be spaced apart 100GHz (0.8nm).And making the frequency of a sideband after the modulation be in the passband of wave filter by the frequency of operation of regulating laser instrument, another sideband will drop on the stopband of wave filter accordingly.Be retained by the light signal that has only a sideband behind the wave filter like this.
The modulation signal that this modulator approach obtains is more stable, and system layout is also simpler and easy.And, also reduced cost owing to only use an electrooptic modulator.
Description of drawings
Fig. 1: laser single-sideband modulation system layout figure
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
The operation wavelength of laser instrument need be set in advance according to the characteristic of wave filter, makes carrier frequency depart from about band connection frequency point 0.1nm, like this for the modulated microwave signal about 10GHz.A sideband of the light signal after the modulation will be positioned at the passband place, is 1550.2nm such as the band connection frequency of wave filter, and period pitch 0.8nm can allow the laser carrier wavelength be positioned at 1550.3nm (reservation upper side band), perhaps 1550.1nm (retaining sideband) so.
Can reduce the power of modulation back carrier wave by the duty of adjusting electrooptic modulator, work characteristics according to modulator, when DC voltage was the modulator half-wave voltage, modulation back carrier power was approximately 0, can obtain two sideband signals that separate after the modulation like this.
Signal after the modulation enters the photo-thermal stable filter, and the frequency component of filter transmission band is passed through, and about the frequency component decay 15db of stopband, like this, by just only remaining the signal of next sideband behind the wave filter, carrier wave and another sideband attenuation are clearly.
It will be appreciated by those skilled in the art that: under the prerequisite that does not deviate from broad scope of the present invention, can change the foregoing description.Thereby the present invention is not limited in disclosed specific embodiment, and its scope should contain core of the present invention and the interior all changes of protection domain that appended claims limits.
Claims (2)
1, a kind of method that is used for the optical SSB modulation of X-band, it is characterized in that: adopt a modulation signal to be operated in X-band, carrier wavelength is the LiNbO of 1550nm
3The electric light intensity modulator.Add the microwave signal of (X-band) about 10G, light signal is modulated.Modulator connects the thermally-stabilised optical filter (Athermal EtalonReference filter) with Fabry-Perot filtering principle.By designing the frequency characteristic of this thermally-stabilised optical filter, make the passband of a sideband of the double-side band light signal after the modulation at wave filter, another sideband drops on the stopband of wave filter, just can realize the single-sideband modulation of light signal.
2, a kind of method that is used for the optical SSB modulation of X-band according to claim 1 is characterized in that: be to use a LiNbO
3Electrooptic modulator, by designing the frequency characteristic of thermally-stabilised optical filter, make the pass of the frequency characteristic of the frequency of two sidebands of light signal after the modulation and thermally-stabilised optical filter be: the sideband that keep is positioned at the passband peak value of wave filter, and the sideband that remove is positioned at the stopband of wave filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100793869A CN101487967A (en) | 2009-03-09 | 2009-03-09 | Optical SSB modulation method used for X waveband |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100793869A CN101487967A (en) | 2009-03-09 | 2009-03-09 | Optical SSB modulation method used for X waveband |
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| Publication Number | Publication Date |
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| CN101487967A true CN101487967A (en) | 2009-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2009100793869A Pending CN101487967A (en) | 2009-03-09 | 2009-03-09 | Optical SSB modulation method used for X waveband |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604752A (en) * | 2013-10-21 | 2014-02-26 | 浙江省计量科学研究院 | Photoacoustic spectrometry based detection device for optical absorption coefficient of aerosol |
| CN104597687A (en) * | 2015-02-09 | 2015-05-06 | 西南交通大学 | Optical single-side band modulation device and method |
-
2009
- 2009-03-09 CN CNA2009100793869A patent/CN101487967A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604752A (en) * | 2013-10-21 | 2014-02-26 | 浙江省计量科学研究院 | Photoacoustic spectrometry based detection device for optical absorption coefficient of aerosol |
| CN104597687A (en) * | 2015-02-09 | 2015-05-06 | 西南交通大学 | Optical single-side band modulation device and method |
| CN104597687B (en) * | 2015-02-09 | 2017-06-23 | 西南交通大学 | Optical single-side band modulating device and method |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Open date: 20090722 |