CN102013924B - Device and method for generating frequency doubling single side band optical carrier millimeter waves - Google Patents
Device and method for generating frequency doubling single side band optical carrier millimeter waves Download PDFInfo
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- CN102013924B CN102013924B CN201010559101.4A CN201010559101A CN102013924B CN 102013924 B CN102013924 B CN 102013924B CN 201010559101 A CN201010559101 A CN 201010559101A CN 102013924 B CN102013924 B CN 102013924B
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Abstract
The invention discloses a device and a method for generating frequency doubling single side band optical carrier millimeter waves in the field of optical communication. The device comprises an adjustable optical source, a radio frequency signal source, an electric amplifier, an electric shunt, a phase shifter and a nested Mach-Zehnder modulator, wherein the output end of the adjustable optical source is connected with the optical input end of the nested Mach-Zehnder modulator; the output end of the radio frequency signal source is connected with the input end of the electric amplifier; the output end of the electric amplifier is connected with the input end of the electric shunt; two output ports of the electric shunt are connected with a radio-frequency driving port of an upper arm sub-modulator of the nested Mach-Zehnder modulator and an input port of the phase shifter respectively; and the output end of the phase shifter is connected with a radio-frequency driving port of a lower arm sub-modulator of the nested Mach-Zehnder modulator. The method comprises the steps of: regulating the phase shift amount of the phase shifter, and arranging the main bias voltage of the nested Mach-Zehnder modulator and the bias voltage of the upper arm and lower arm sub-modulators reasonably. By the device and the method, a structure of a system is simplified, and the tenability and expansibility of the system are improved.
Description
Technical field
The present invention relates to optical communication field, relate in particular to a kind of apparatus and method that produce frequency doubling single side band optical carrier millimeter waves.
Background technology
Optical fiber-wireless communication technology adopts optical fiber link to transmit radio signal, super bandwidth, the high reliability of the characteristics such as removable, the point-to-multipoint access of broadband wireless communications and optical fiber communication are combined, for large capacity, radio signal wire transmission cheaply and the super wideband wireless access that surpasses Gbit/s provide desirable solution.For optical-fiber wireless system, producing high-quality light, to carry millimeter wave be one of key technology realizing system communication.In recent years, researcher has proposed much light and has carried millimeter wave generation scheme both at home and abroad, comprises that double-side band light carries millimeter wave, and single-side belt light carries millimeter wave, and carrier wave suppresses light and carries millimeter wave.Single-side belt light wherein carries millimeter wave owing to effectively overcoming optical fiber dispersion impact, has obvious technical advantage.
But, at current single-side belt light, carry in millimeter wave generating method, generally only can produce the single-side belt light equating with frequency modulating signal carries millimeter wave.If produce the light of higher frequencies such as 60GHz, 100GHz, carry millimeter-wave signal, need the even High Speed Modulation device of 100GHz of 60GHz.Due to the restriction of prior art, these devices are not yet commercial, even if commercialization, the cost of its system is very expensive.Therefore, if can the method based on double frequency utilize the commercial modulation device of traditional low rate to produce high-frequency single-side belt light, carry millimeter-wave signal, by effectively improving light and carry the generation efficiency of millimeter wave, reduce system cost.
Through the literature search of prior art is found, the people such as Jianjun Yu are at IEEE Photonics Technology Letters, 20 (7): in the ANovel Scheme to Generate Single-Sideband Millimeter-Wave Signals by Using Low-Frequency Local Oscillator Signal delivering on 478-480 (< < IEEE photonic propulsion technology wall bulletin > > 2008) (< < adopts low frequency local oscillation signal to produce the New Scheme > > that single-side belt light carries millimeter wave), mention, first use the Mach-Zehnder modulators of bipolar electrode to produce the optics double-sideband signal that comprises centered carrier and second order up/down sideband, adopt again one of them second order sideband of tunable optic filter filtering, make centered carrier and another one second order sideband pass through filter, thereby produce the single-side belt light carrier millimeter wave of double frequency.Yet the optics external devices that this device adopts is more, causes the insertion loss of whole system larger.On the other hand, because this device carrys out one of them second order sideband of filtering by optical band pass filter, the centre wavelength of this optical band pass filter and the scope of band connection frequency must regulate according to the variation of the centre frequency of light carrier and frequency modulating signal, the tunability of whole device is poor, is especially not easy to extend to wavelength-division multiplex system.
Summary of the invention
The present invention is directed to above-mentioned the deficiencies in the prior art, proposed a kind of simple in structure, tunable frequency doubling single side band optical carrier millimeter waves generation device and method that autgmentability is strong.The present invention adopts the Mach-Zehnder modulators of a nested structure, linear modulation based on light signal and interference superimposing technique, by regulating the phase-shift phase of phase shifter, by the main bias voltage of nested Mach-Zehnder modulators and the bias voltage of two son modulation of up/down arm are rationally set, thereby produce 2 times to the frequency doubling single side band optical carrier millimeter wave of frequency modulating signal, reduced the cost of system.
The present invention adopts following concrete technical scheme to realize:
The frequency doubling single side band optical carrier millimeter waves generation device that the present invention proposes comprises tunable light source, radio-frequency signal source, electric amplifier, electric shunt, phase shifter, nested Mach-Zehnder modulators, it is characterized in that: the output of described tunable light source is connected with the light input end of nested Mach-Zehnder modulators; The output of described radio-frequency signal source is connected with electric amplifier input; The output of described electric amplifier is connected with the input of electric shunt; Described nested Mach-Zehnder modulators is comprised of two son modulation of up/down arm; Two output ports of described electric shunt link respectively the radio-frequency driven port of the sub-modulator of upper arm of nested Mach-Zehnder modulators and the input port of phase shifter; The output of described phase shifter is connected with the radio-frequency driven port of the sub-modulator of underarm of nested Mach-Zehnder modulators;
Wherein, described nested Mach-Zehnder modulators is by being integrated in isostructure on one single chip, forming with two sub-modulators of up/down arm of performance, two sub-modulators have radio-frequency driven port and offset port, nested Mach-Zehnder modulators has main offset port, for controlling the phase difference of two sub-modulator output optical signals.
The frequency doubling single side band optical carrier millimeter waves production method that the present invention proposes comprises the following steps:
The continuous light wave that step 1, tunable light source output frequency are fc is divided into upper and lower two-way after entering nested Mach-Zehnder modulators, by two sub-modulators of up/down arm, modulated respectively, radio-frequency signal source output frequency is after the sinusoidal local oscillation signal of fe amplifies by electric amplifier, by electric shunt, to be divided into the two paths of signals of constant power: the sinusoidal local oscillation signal of the first via drives the sub-modulator of upper arm, and the sinusoidal local oscillation signal in the second road is through the sub-modulator of phase shifter phase shift rear drive underarm;
Wherein, the light double-sideband signal that described repetition rate is 2fe is comprised of centered carrier fc, second order upper sideband fc+2fe and tri-frequency components of second order lower sideband fc-2fe;
Wherein, the frequency doubling single side band optical carrier millimeter waves that described repetition rate is 2fe is comprised of centered carrier fc, two frequency components of second order lower sideband fc-2fe.
The invention has the beneficial effects as follows, need to not come filtering second order up/down sideband can realize the generation of the double frequency light carrier millimeter wave of single-side belt by optically filtering device, reduced optics number, reduced the insertion loss of system; Do not need the wavelength of optical filter and the logical frequency range of band to mate with the centre wavelength of light source light wave and the frequency of modulation signal.Therefore whole device is tunable good, has very strong operability, is easier to practical application.
Accompanying drawing explanation
Fig. 1 is that frequency doubling single side band optical carrier millimeter waves of the present invention produces schematic diagram
Fig. 2 is embodiment of the present invention result figure
Wherein, Fig. 2 (1) is the time domain waveform of 20GHz sinusoidal drive signals; Fig. 2 (2) is the spectrum of the frequency doubling single side band optical carrier millimeter waves signal of nested Mach-Zehnder modulators output, can see that its repetition rate is 40GHz; Fig. 2 (3) is the time domain waveform of the electric millimeter-wave signal that produces after detector opto-electronic conversion of frequency doubling single side band optical carrier millimeter waves signal, can see that its repetition rate is 40GHz, consistent with the waveform of original 20GHz sinusoidal drive signals, there is not distortion; Fig. 2 (4) is the electric millimeter-wave signal frequency spectrum that frequency doubling single side band optical carrier millimeter waves signal produces after detector opto-electronic conversion, can see the large 25dB of other Frequency point power of power ratio of 40GH Frequency point.
Embodiment
Below in conjunction with accompanying drawing, describe the specific embodiment of the present invention in detail.
As shown in Figure 1, in the present embodiment, device comprises: tunable light source, radio-frequency signal source, electric amplifier, electric shunt, phase shifter, nested Mach-Zehnder modulators.Tunable light source, radio-frequency signal source, electric amplifier, electric shunt, phase shifter, nested Mach-Zehnder modulators, is characterized in that: the output of described tunable light source is connected with the light input end of nested Mach-Zehnder modulators; The output of described radio-frequency signal source is connected with electric amplifier input; The output of described electric amplifier is connected with the input of electric shunt; Described nested Mach-Zehnder modulators is comprised of two son modulation of up/down arm; Two output ports of described electric shunt link respectively the radio-frequency driven port of the sub-modulator of upper arm of nested Mach-Zehnder modulators and the input port of phase shifter; The output of described phase shifter is connected with the radio-frequency driven port of the sub-modulator of underarm of nested Mach-Zehnder modulators.
In this example, the concrete implementation step of method is:
The frequency doubling single side band optical carrier millimeter waves that step 4, above-mentioned repetition rate are 40GHz transfers to base station by standard single-mode fiber, and through photoelectricity inspection detector, generates the electric millimeter wave of 40GHz.
Fig. 2 is that this exemplary application is in the result shown in Fig. 1.Wherein, Fig. 2 (1) is the time domain waveform of 20GHz sinusoidal drive signals; Fig. 2 (2) is the spectrum of the frequency doubling single side band optical carrier millimeter waves signal of nested Mach-Zehnder modulators output, can see that its repetition rate is 40GHz; Fig. 2 (3) is the time domain waveform of the electric millimeter-wave signal that produces after detector opto-electronic conversion of frequency doubling single side band optical carrier millimeter waves signal, can see that its repetition rate is 40GHz, consistent with the waveform of original 20GHz sinusoidal drive signals, there is not distortion; Fig. 2 (4) is the electric millimeter-wave signal frequency spectrum that frequency doubling single side band optical carrier millimeter waves signal produces after detector opto-electronic conversion, can see the large 25dB of other Frequency point power of power ratio of 40GH Frequency point.
In a word, the above embodiment is only preferred embodiments of the present invention, not only for limiting protection scope of the present invention.Should be understood that; ordinary skill for the art; in content disclosed by the invention; can also make some equivalent variations and replacement; the frequency range of millimeter wave is also not limited to 40GHz, and the modulation of these equivalent variations and replacement and frequency range also should be considered as protection scope of the present invention.
Claims (6)
1. a generation device for frequency doubling single side band optical carrier millimeter waves, comprises tunable light source, radio-frequency signal source, electric amplifier, electric shunt, phase shifter, nested Mach-Zehnder modulators, it is characterized in that:
The output of described tunable light source is connected with the light input end of nested Mach-Zehnder modulators; The output of described radio-frequency signal source is connected with electric amplifier input; The output of described electric amplifier is connected with the input of electric shunt; Described nested Mach-Zehnder modulators is comprised of two sub-modulators of up/down arm; Two output ports of described electric shunt link respectively the radio-frequency driven port of the sub-modulator of upper arm of nested Mach-Zehnder modulators and the input port of phase shifter; The output of described phase shifter is connected with the radio-frequency driven port of the sub-modulator of underarm of nested Mach-Zehnder modulators.
2. the generation device of frequency doubling single side band optical carrier millimeter waves as claimed in claim 1, is characterized in that:
Described nested Mach-Zehnder modulators is comprised of two the sub-modulators of up/down arm that are integrated on one single chip, these two sub-modulators have identical structure and performance, every sub-modulator all has independently prevention at radio-frequency port and offset port, nested Mach-Zehnder modulators also has a main offset port in addition, for regulating the output of up/down arm modulator.
3. a production method for frequency doubling single side band optical carrier millimeter waves, is characterized in that, comprises following steps:
The continuous light wave that step 1, tunable light source output frequency are fc is divided into upper and lower two-way after entering nested Mach-Zehnder modulators, by two sub-modulators of up/down arm of nested Mach-Zehnder modulators, modulated respectively, radio-frequency signal source output frequency is after the sinusoidal local oscillation signal of fe amplifies by electric amplifier, by electric shunt, to be divided into the two paths of signals of constant power: the sinusoidal local oscillation signal of the first via drives the sub-modulator of upper arm, and the sinusoidal local oscillation signal in the second road is through the sub-modulator of phase shifter phase shift rear drive underarm;
Step 2, the sub-modulator of upper arm that regulates nested Mach-Zehnder modulators and the bias voltage of the sub-modulator of underarm, make the output of two sub-modulators produce respectively the light double-sideband signal that repetition rate is all 2fe;
Wherein, the light double-sideband signal that described repetition rate is 2fe is comprised of centered carrier fc, second order upper sideband fc+2fe and tri-frequency components of second order lower sideband fc-2fe;
Step 3, regulate the phase-shift phase of described phase shifter, the phase difference that makes the second order upper sideband of the light double-sideband signal that the second order upper sideband of the light double-sideband signal that the sub-modulator of described underarm produces produces with respect to the sub-modulator of upper arm is that the phase difference of the second order lower sideband of the light double-sideband signal that produces with respect to the sub-modulator of upper arm of the second order lower sideband of the light double-sideband signal that produces of the sub-modulator of pi/2, described underarm is-pi/2;
Step 4, regulate the main bias voltage of nested Mach-Zehnder modulators, making the phase difference variable of the second order upper sideband of the light double-sideband signal that the second order upper sideband of the light double-sideband signal that the sub-modulator of underarm produces produces with respect to the sub-modulator of upper arm is π, the second order lower sideband phase difference variable of the light double-sideband signal that the second order lower sideband of the light double-sideband signal that the sub-modulator of underarm produces produces with respect to the sub-modulator of upper arm is 0, at the output of nested Mach-Zehnder modulators: the second order upper sideband that described phase difference is π is cancelled out each other, described phase difference is that 0 second order lower sideband superposes mutually, the frequency doubling single side band optical carrier millimeter waves that final generation repetition rate is 2fe,
Wherein, the frequency doubling single side band optical carrier millimeter waves that described repetition rate is 2fe is comprised of centered carrier fc, two frequency components of second order lower sideband fc-2fe.
4. the production method of frequency doubling single side band optical carrier millimeter waves as claimed in claim 3, is characterized in that, the sub-modulator of upper arm of described nested Mach-Zehnder modulators and the bias voltage of the sub-modulator of underarm are all adjusted to the peak of transmission curve.
5. the production method of frequency doubling single side band optical carrier millimeter waves as claimed in claim 3, is characterized in that, the phase-shift phase of described phase shifter is adjusted to the sinusoidal local oscillation signal of the first via and sinusoidal local oscillation signal phase place phase difference of pi/4, the second road.
6. the production method of frequency doubling single side band optical carrier millimeter waves as claimed in claim 3, is characterized in that, the V pi/2 transfer point that the main bias voltage adjustment of described nested Mach-Zehnder modulators is transmission curve.
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| CN102185814B (en) * | 2011-04-25 | 2014-01-01 | 武汉邮电科学研究院 | Method for automatically compensating bias voltage of QPSK (quadri phase shift keying) lithium niobate modulator |
| CN102215069A (en) * | 2011-05-26 | 2011-10-12 | 北京交通大学 | Frequency-adjustable triangle-wave photon generator |
| CN102412904B (en) * | 2011-11-10 | 2014-05-28 | 北京交通大学 | Triangular optical pulse generating device based on double-electrode Zehnder modulator |
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| CN103795472B (en) * | 2014-03-04 | 2016-01-13 | 上海交通大学 | Based on the production method of the three-dimensional modulating UWB signal of single Dual Drive modulator |
| CN103795438B (en) * | 2014-03-06 | 2016-01-13 | 上海交通大学 | Based on the ultra-wide band radio-frequency signal generating method of Dual Drive modulator |
| CN103873110B (en) * | 2014-04-01 | 2016-01-20 | 上海交通大学 | Based on the generation device of the multiband ultra-wide band radio-frequency signal of Dual Drive modulator |
| CN111193549B (en) * | 2019-11-14 | 2021-02-23 | 苏州枫桥光电科技有限公司 | Optical frequency comb generation device and method based on bilateral cyclic frequency shift |
| CN111596278A (en) * | 2019-12-24 | 2020-08-28 | 北京理工大学 | Multi-band coherent frequency-sweeping radar system based on dual-drive Mach-Zehnder modulator |
| CN115549791A (en) * | 2021-06-30 | 2022-12-30 | 中兴通讯股份有限公司 | Optical millimeter wave receiving end, transmitting end, system, demodulation method and modulation method |
| CN114114531B (en) * | 2021-11-03 | 2023-02-28 | 上海交通大学 | Silicon-based single-sideband modulator chip with high rejection ratio |
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