CN104466621A - Optoelectronic oscillator based on germanium modulator - Google Patents
Optoelectronic oscillator based on germanium modulator Download PDFInfo
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- CN104466621A CN104466621A CN201410834717.6A CN201410834717A CN104466621A CN 104466621 A CN104466621 A CN 104466621A CN 201410834717 A CN201410834717 A CN 201410834717A CN 104466621 A CN104466621 A CN 104466621A
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Abstract
The invention provides an optoelectronic oscillator based on a germanium modulator, and relates to the field of radio frequency components. The optoelectronic oscillator comprises an input spot-size converter, the germanium modulator and an output spot-size converter. The input spot-size converter, the germanium modulator and the output spot-size converter are integrated on the same chip which is arranged on an SOI wafer. The optoelectronic oscillator further comprises a light source. The light source is coupled to the germanium modulator through the input spot-size converter. The output spot-size converter is connected with the end B of an optical circulator. The end C of the optical circulator is connected with an optical fiber delay line, an erbium-doped fiber amplifier and the end A of an optical coupler in sequence. The end B of the optical coupler is connected with the end A of the optical circulator. The germanium modulator is connected with an electric band-pass filter which is connected with the end B of an electric circulator, the end C of the electric circulator is sequentially connected with an electric amplifier and the end A of an electric coupler, and the end B of the electric coupler is connected with the end A of the electric circulator. According to the optoelectronic oscillator based on the germanium modulator, active devices are highly integrated, the occupied space is small, the power consumption is low, and the cost of the optoelectronic oscillator is reduced.
Description
Technical field
The present invention relates to radio-frequency devices field, specifically relate to a kind of optical-electronic oscillator based on germanium modulator.
Background technology
Electronic microwave oscillation source spectral purity conventional is at present not high, and highly purified radio-frequency signal source has important using value in the field such as radar, communication, and optical-electronic oscillator can produce the oscillator signal of high spectral purity.Optical-electronic oscillator is primarily of the composition such as light source, optical modulator, photo-detector, optical delay line, optical coupler and radio frequency band filter, electric amplifier, electric coupling.Light source sends signal to optical modulator, the light signal of modulation is detected by photo-detector after optical delay line transmission, the electricity that detector obtains carries out reloading on optical modulator after radio frequency band filter filtering, go round and begin again, produce the high-purity radiofrequency signal identical with radio frequency band filter passband.
But because optical modulator and photo-detector are active device, device costly; And optical modulator and photo-detector are discrete device, take volume comparatively large, power consumption is also higher, and therefore the cost of whole optical-electronic oscillator is higher.
Summary of the invention
For the defect existed in prior art, the object of the present invention is to provide a kind of optical-electronic oscillator based on germanium modulator, active device height is integrated, takies volume little, low in energy consumption, reduces the cost of optical-electronic oscillator.
For reaching above object, the present invention takes a kind of optical-electronic oscillator based on germanium modulator, comprise input spot-size converter, germanium modulator and export spot-size converter, three is integrated in same chip, and chip manufacturing is in SOI wafer, optical-electronic oscillator also comprises light source, light source is coupled into germanium modulator by input spot-size converter, export the B end that spot-size converter connects an optical circulator, the C of optical circulator holds the A of connecting fiber delay line, erbium-doped fiber amplifier, optical coupler successively to hold, and the B end of optical coupler connects the A end of optical circulator; Described germanium modulator connects an electric band pass filter, and electric band pass filter connects the B end of an electric circulator, and the C end of described electric circulator connects the A end of electric amplifier, electric coupling successively, and the B of electric coupling connects the A end of electric circulator.
On the basis of technique scheme, described electric band pass filter centre frequency is less than the three dB bandwidth of germanium modulator.
On the basis of technique scheme, the C end of described optical coupler is as radio frequency light signal output end mouth, and the signal oscillating frequency of radio frequency light signal output end mouth is identical with electric band pass filter centre frequency.
On the basis of technique scheme, the C of described electric coupling holds the output port as rf signal, and the signal oscillating frequency of the output port of rf signal is identical with electric band pass filter centre frequency.
On the basis of technique scheme, the C that the B of described optical coupler holds splitting ratio to be greater than optical coupler holds splitting ratio, and the C that the B of electric coupling holds point power ratio to be greater than electric coupling holds point power ratio.
On the basis of technique scheme, the splitting ratio that described optical coupler C holds is 5%, and the splitting ratio that optical coupler B holds is 95%.
On the basis of technique scheme, described electric coupling B holds point power ratio to be that 90%, C holds point power ratio to be 10%.
On the basis of technique scheme, described optical circulator, fiber delay line, erbium-doped fiber amplifier, optical coupler form light circuit, and described electric circulator, electric amplifier, electric coupling form electric loop.
Beneficial effect of the present invention is: described germanium modulator is as modulator, again as detector, electric circulator is utilized to realize the circulation vibration of radiofrequency signal, optical circulator is utilized to realize the circulation vibration of light signal, realize silica-based light integrated, decrease the quantity of active device, take volume little, improve the stability of a system, reduce system cost and power consumption.
Accompanying drawing explanation
Fig. 1 is the block diagram of the embodiment of the present invention based on the optical-electronic oscillator of germanium modulator;
Fig. 2 is the spectrogram of embodiment of the present invention radio frequency light signal output end;
Fig. 3 is the spectrogram of embodiment of the present invention rf signal output.
Reference numeral:
1-light source, 2-inputs spot-size converter, 3-germanium modulator, and 4-exports spot-size converter, 5-SOI wafer, 6-optical circulator, 7-fiber delay line, 8-erbium-doped fiber amplifier, 9-optical coupler, 10-electricity band pass filter, 11-electricity circulator, 12-electric amplifier, 13-electric coupling.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Figure 1, the present invention is based on the optical-electronic oscillator of germanium modulator, include spot-size converter 2, germanium modulator 3 and export spot-size converter 4, three is integrated in same chip jointly, and chip manufacturing is on SOI (Silicon-On-Insulator, the silicon in dielectric substrate) wafer; In the present embodiment, the three dB bandwidth of germanium modulator is 15GHz.Described optical-electronic oscillator also comprises light source 1, and light source 1 wavelength is 1550nm, is coupled into germanium modulator 3 by input spot-size converter 2.
Export the B end that spot-size converter 4 connects optical circulator 6, the C of optical circulator 6 holds connecting fiber delay line 7, and in the present embodiment, fiber delay line 7 length is 2 kilometers.Optical delay line 7 connects erbium-doped fiber amplifier (Erbium-doped Optical Fiber Amplifier, EDFA) incidence end of 8, the exit end of erbium-doped fiber amplifier 8 connects the A end of optical coupler 9, the B end of optical coupler 9 connects the A end of optical circulator 6, and optical circulator 6, fiber delay line 7, erbium-doped fiber amplifier 8, optical coupler 9 form light circuit jointly.The C end of optical coupler 9 is as radio frequency light signal output end mouth, and the splitting ratio of the C end of optical coupler 9 is 5%, and the B of optical coupler 9 holds splitting ratio its C large to hold splitting ratio, and the splitting ratio of the B end of optical coupler 9 is 95%.
Germanium modulator 3 connects an electric band pass filter 10, and electric band pass filter centre frequency is less than the three dB bandwidth of germanium modulator, and the centre frequency of electric band pass filter 10 is 15GHz, and bandwidth is 1MHz.The other end of electricity band pass filter 10 connects the B end of an electric circulator 11, the C end of electricity circulator 11 connects the incidence end of electric amplifier 12, the bandwidth of operation of electric amplifier 12 is greater than 15GHz, the exit end of electric amplifier 12 connects the A end of electric coupling 13, the B end of electric coupling 13 connects the A end of electric circulator 11, and electric circulator 11, electric amplifier 12, electric coupling 13 form electric loop jointly.The C of electric coupling 13 holds the output port as rf signal, and its C holds point power ratio to be 10%, and the B of electric coupling 13 holds a point power ratio to be greater than its C and holds point power ratio, and the B of electric coupling 13 holds point power ratio to be 90%.As shown in Figure 2, wherein λ 0 is light source input wavelength, f is the centre wavelength of electric band pass filter 10, the light signal that radio frequency light signal output end mouth exports is the sine wave of 15GHz in time domain, centered by spectrally, wavelength is 1550nm, occurs sideband in the position of centre wavelength interval ± 15GHz integral multiple.As shown in Figure 3, represent that the signal oscillating frequency of the signal oscillating frequency of the output port of rf signal, radio frequency light signal output end mouth is all identical with the centre frequency f of electric band pass filter 10.
The present invention is based on the optical-electronic oscillator of germanium modulator, the principle realizing optoelectronic oscillation is as follows:
Light source 1 is coupled into germanium modulator 3 by input spot-size converter 2, the signal of telecommunication that electric amplifier 12 produces wide range enters the A port of electric coupling 13, major part power enters the A port of electric circulator from the B port of electric coupling 13, bring out electric band pass filter 10 filtering that the signal of telecommunication penetrated is 15GHz through centre frequency from the B of electric circulator, the rf signal of 15GHz is carried on germanium modulator 3.15GHz radio frequency light signal is become by the optical signal modulation being coupled into germanium modulator 3 to enter the B end of optical circulator 6, radio frequency light signal brings out from the C of optical circulator 6 and penetrates, amplify through fiber delay line 7 and erbium-doped fiber amplifier 8, enter the A end of optical coupler 9, most of luminous power enters germanium modulator 3 through the B end of optical coupler 9 and the A end of optical circulator 6 and is detected.Radio frequency light signal after amplification is converted to rf signal by germanium modulator 3, through the filtering again of electric band pass filter 10, B port by electric circulator 11, the C from electric circulator 11 end enters electric amplifier 12 and amplifies, finally enter the A port of electric circulator 11, be loaded on germanium modulator 3, realize circulation and the amplification of the 15GHz signal of telecommunication.
The 15GHz signal of telecommunication that the C end of electric coupling 13 amplifies vibrating in electric loop exports, and the 15GHz light signal that the C end of optical coupler 9 amplifies vibrating in optical loop exports.The object that the C of electric coupling 13 holds point power ratio to be less than its B end reduces the loop loss of the signal of telecommunication, and the object that the C of optical coupler 9 holds point power ratio to be less than its B end reduces the loop loss of light signal, thus ensure the vibration amplification in the loop of optical, electrical signal.
The present invention is not limited to above-mentioned execution mode, and for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications are also considered as within protection scope of the present invention.The content be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (8)
1. the optical-electronic oscillator based on germanium modulator, it is characterized in that, comprise input spot-size converter, germanium modulator and export spot-size converter, three is integrated in same chip, and chip manufacturing is in SOI wafer, optical-electronic oscillator also comprises light source, light source is coupled into germanium modulator by input spot-size converter, export the B end that spot-size converter connects an optical circulator, the C of optical circulator holds the A of connecting fiber delay line, erbium-doped fiber amplifier, optical coupler successively to hold, and the B end of optical coupler connects the A end of optical circulator; Described germanium modulator connects an electric band pass filter, and electric band pass filter connects the B end of an electric circulator, and the C end of described electric circulator connects the A end of electric amplifier, electric coupling successively, and the B of electric coupling connects the A end of electric circulator.
2. as claimed in claim 1 based on the optical-electronic oscillator of germanium modulator, it is characterized in that: described electric band pass filter centre frequency is less than the three dB bandwidth of germanium modulator.
3. as claimed in claim 2 based on the optical-electronic oscillator of germanium modulator, it is characterized in that: the C end of described optical coupler is as radio frequency light signal output end mouth, and the signal oscillating frequency of radio frequency light signal output end mouth is identical with electric band pass filter centre frequency.
4. as claimed in claim 2 based on the optical-electronic oscillator of germanium modulator, it is characterized in that: the C of described electric coupling holds the output port as rf signal, and the signal oscillating frequency of the output port of rf signal is identical with electric band pass filter centre frequency.
5. as claimed in claim 1 based on the optical-electronic oscillator of germanium modulator, it is characterized in that: the C that the B of described optical coupler holds splitting ratio to be greater than optical coupler holds splitting ratio, the C that the B of electric coupling holds point power ratio to be greater than electric coupling holds point power ratio.
6. as claimed in claim 5 based on the optical-electronic oscillator of germanium modulator, it is characterized in that: the C of described optical coupler holds splitting ratio to be 5%, the B of optical coupler holds splitting ratio to be 95%.
7. as claimed in claim 5 based on the optical-electronic oscillator of germanium modulator, it is characterized in that: the B of described electric coupling holds point power ratio to be 90%, the C of electric coupling holds point power ratio to be 10%.
8. as claimed in claim 1 based on the optical-electronic oscillator of germanium modulator, it is characterized in that: described optical circulator, fiber delay line, erbium-doped fiber amplifier, optical coupler form light circuit, and described electric circulator, electric amplifier, electric coupling form electric loop.
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| CN201410834717.6A CN104466621B (en) | 2014-12-29 | 2014-12-29 | A kind of optical-electronic oscillator based on germanium modulator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107887783A (en) * | 2017-11-03 | 2018-04-06 | 天津大学 | A kind of photonic sampling system and method based on OEO |
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| US20130010819A1 (en) * | 2010-10-15 | 2013-01-10 | Ahmad Asmahanim Bte | All-optical generation of 60 ghz millimeter wave using multiple wavelength brillouin-erbium fiber laser |
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| CN104242020A (en) * | 2014-09-24 | 2014-12-24 | 湖南工学院 | Low-phase-noise novel photoelectric oscillator |
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2014
- 2014-12-29 CN CN201410834717.6A patent/CN104466621B/en active Active
Patent Citations (5)
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| JP2006060794A (en) * | 2004-07-22 | 2006-03-02 | National Institute Of Advanced Industrial & Technology | Optical clock signal extracting apparatus |
| US20130010819A1 (en) * | 2010-10-15 | 2013-01-10 | Ahmad Asmahanim Bte | All-optical generation of 60 ghz millimeter wave using multiple wavelength brillouin-erbium fiber laser |
| US20130259072A1 (en) * | 2012-03-27 | 2013-10-03 | Oewaves, Inc. | Tunable opto-electronic oscillator having optical resonator filter operating at selected modulation sideband |
| CN203631957U (en) * | 2013-12-23 | 2014-06-04 | 贵州大学 | Double-loop photoelectric oscillator with reciprocated optical path |
| CN104242020A (en) * | 2014-09-24 | 2014-12-24 | 湖南工学院 | Low-phase-noise novel photoelectric oscillator |
Non-Patent Citations (1)
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| 章献民等: "光电振荡器", 《微波学报》 * |
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| CN107887783A (en) * | 2017-11-03 | 2018-04-06 | 天津大学 | A kind of photonic sampling system and method based on OEO |
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