CN104113376A - Double-parallel modulation-based 60GHz optical millimeter wave RoF system - Google Patents
Double-parallel modulation-based 60GHz optical millimeter wave RoF system Download PDFInfo
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- CN104113376A CN104113376A CN201310138424.XA CN201310138424A CN104113376A CN 104113376 A CN104113376 A CN 104113376A CN 201310138424 A CN201310138424 A CN 201310138424A CN 104113376 A CN104113376 A CN 104113376A
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- phase
- frequency
- modulator
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- millimeter wave
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Abstract
The invention relates to an RoF (radio over-fiber) system which adopts a phase modulator to generate sixfold-frequency optical carrier millimeter waves. According to the system, a double-parallel phase modulator is adopted to realize sixfold-frequency modulation; a light spectrum which can inhibit first-order sideband can be generated through adjusting the phase offset of the phase modulator; a right three-order sideband signal and a left three-order sideband signal can be obtained through coupling subtraction; and frequency beat is performed in a photoelectric detector, so that optical carrier millimeter waves of which the frequency is six times of the frequency of radio-frequency signals can be generated. As showed by simulation results, 10GHz radio frequency signals can generate 60GHz optical carrier millimeter wave signals, and 5Gb/s data signals can be transmitted for more than 10km in a single-mode optical fiber.
Description
one, technical field
The present invention relates to a kind of design of the 60GHz optical millimeter wave RoF system based on two parallel PM modulation, belong to light and carry millimeter wave generation field in (optical fiber) millimeter wave (RoF) communication technology.
two, background technology
High bandwidth, low-loss, the anti-electromagnetic interference of optical fiber radio communication (RoF:Radio over-Fiber) technological incorporation optical fiber communication and radio communication is removable, the advantage of flexible access, can realize at low cost the wire transmission of large capacity radiofrequency signal and the wireless access of super bandwidth, be a kind of access network technology having a extensive future.In recent years, RoF technology is the hot research problem of Chinese scholars always, and wherein how producing high-quality millimeter wave is one of key content in RoF system.
At present, millimeter wave producing method mainly contains direct intensity modulation technology, external intensity modulation technique, light heterodyne technology and the method based on harmonic generation technology.External intensity modulation technique is that radiofrequency signal is modulated on light carrier by an external modulator, can produce the millimeter wave of high frequency.But light intensity modulator needs complicated circuit to control bias voltage, intensity modulator is more, and system configuration is just more complicated.And phase-modulator does not need the control of DC offset voltage, can avoid the impact of DC shift, and low to its linear modulation bandwidth requirement, omit control circuit, simplified system configuration, phase-modulator makes up this defect, simultaneously, phase-modulator has low insertion loss, can just can produce optical millimeter wave by relatively little radiofrequency signal.
four, summary of the invention
The present invention adopts two parallel phase-modulators (PM) to realize the scheme of six frequency doubled light millimeter waves.The sinusoidal signal that with phase difference is the 10GHz of 180 ° drives respectively two parallel phase-modulators to produce the optical millimeter wave signal of 60GHz.Suppress single order sideband by the phase shift side-play amount that regulates PM modulator, then coupling obtains two the three rank sidebands in left and right after subtracting each other.Then by data signal modulation to light wave, two three rank sidebands beat frequency in photoelectric detector, produce 60GHz the light of six frequencys multiplication carry millimeter wave.Scheme has only been used phase-modulator, relatively simple for structure, has reduced system cost.Experimental result shows, in the time that rf frequency is 10GHz, the light that to have produced frequency be 60GHz carries millimeter-wave signal, and meanwhile, more than the data-signal of carrying 5Gb/s can transmit 10km in monomode fiber, Power penalty is less than 1.5dB.
five, brief description of the drawings
Fig. 1 adopts PM modulation to realize the structure chart of six frequency doubled light millimeter wave schemes;
Fig. 2 is ROF system emulation block diagram;
Fig. 3 is the spectrogram of spectrometer in ROF system emulation block diagram;
Fig. 4 is the spectrogram of spectrometer 1 in ROF system emulation block diagram;
Fig. 5 is the spectrogram of spectrometer 2 in ROF system emulation block diagram;
Fig. 6 is the spectrogram of spectrometer 3 in ROF system emulation block diagram;
Fig. 7 is the spectrogram of spectrometer 4 in ROF system emulation block diagram;
Fig. 8 is the electricity figure frequently of RF analyzer in ROF system emulation block diagram.
six, specific implementation method
Adopt structure chart that two parallel phase-modulators (PM) modulation realize six frequency doubled light millimeter wave schemes as shown in Figure 1.Produce constant light carrier at central station by continuous wave laser (CW) and enter two parallel phase-modulators (PM).Drive respectively two parallel phase-modulators (PM) by the sinusoidal signal of 10 GHz of phase difference 180 simultaneously.Suppress single order sideband signals by regulating the phase deviation constant of PM, producing, then coupling obtains two three rank sideband signals after subtracting each other, and high-order sideband is ignored.Be input in optical fiber and transmit by optics rectangular filter (ORF), can generate the millimeter-wave signal of six frequencys multiplication through photoelectric detector (PD) beat frequency.
Principle explanation is as follows: the optical carrier expression formula that continuous wave laser (CW) produces is:
, wherein
for its amplitude,
for its angular frequency.Sinusoidal signal expression formula is:
, wherein
for radiofrequency signal amplitude,
for radiofrequency signal angular frequency.
Sinusoidal signal drives after PM_1, and the expression formula of PM_1 output end signal is:
(1)
RF signal is through phase difference 180 rear drive PM_2, and the expression formula of PM_2 output end signal is:
(2)
In its Chinese style (1) and (2)
for phase pushing figure.
Bessel function is carried out in formula (1) and (2) to launch to obtain:
(3)
(4)
Wherein
for n rank Bessel function of the first kind.
If ignore high-order sidebands more than three rank, formula (3) and formula (4) can approximate into:
(5)
After the coupling of light subtracter, can obtain:
(6) can find out from formula (6), formula (6) has only included single order sideband and three rank sidebands.If
, can obtain
(7)
Formula (7) has only included two the three rank sidebands in left and right.From shifting analysis onto and can draw above, as long as suppress single order sideband, after subtracting each other by coupling, can obtain two three rank sidebands, and ignore high-order sideband.In phase-modulator, by control phase side-play amount
, make
, single order sideband effectively just can be inhibited.
seven, system emulation result
based on theory analysis above, accompanying drawing 2 is for to utilize Optisystem simulation software to construct the concrete Simulation Interface schematic block diagram of corresponding RoF system.
This system parameter setting is as follows: the optical wavelength that continuous wave laser sends is 1550nm (being that operation wavelength is 193.1THz), and live width is 10MHz, and power is 10dBm; The frequency of forcing function generator is 10GHz; The phase pushing figure of two parallel phase-modulators
reg; The phase-shift phase of electricity phase-shifter is 180; Baseband signal is that the binary system signal of telecommunication that drives nonreturn to zero code pulse signal generator to produce by PRBS is simulated, and its speed is 5Gb/s; Optical moment mode filter centre frequency is 193.1THz, bandwidth 68GHz, and insertion loss is 5dB, the degree of depth is 100dB; Standard single-mode fiber length is 10km.
Result: the light that to have produced frequency be 60GHz carries millimeter-wave signal
Interpretation of result: accompanying drawing 3 is after the sinusoidal signal of 10 GHz drives phase-modulator 1, is modulated to the spectrogram of light carrier, and as can be seen from the figure, sinusoidal signal modulation has produced a series of sideband signals to light carrier.In emulation, phase-modulator 1 phase-modulation index β is 439reg, can obtain, and the amplitude of single order band components is zero, and single order sideband is effectively suppressed.The sinusoidal signal of accompanying drawing 4 10 GHz is first passed through electric phase-shifter, then after driving phase-modulator 2, to the spectrogram of light carrier.In emulation, phase-modulator 2 phase-modulation index β are 439reg, can obtain equally, and the amplitude of single order band components is zero, and single order sideband is effectively suppressed.Accompanying drawing 5 is that the spectrogram of the light carrier obtaining can be found out from accompanying drawing after the coupling of light subtracter, and after coupler, center sideband and second order sideband are cancelled, and can obtain positive and negative three rank sidebands.Difference on the frequency between positive and negative three rank sidebands is 60GHz, both beat frequency rates by six times to the frequency of modulation signal.Accompanying drawing 6 is the spectrogram of the optics millimeter wave containing loading base band data.Accompanying drawing 7 is the light wave the adjusted spectrogram after optics rectangular filter, and as seen from the figure, spectrum has only been left two the three rank sidebands in left and right, and their frequency interval is 60GHz.Accompanying drawing 8 is the spectrograms after beat frequency, and by photoelectric detector, beat frequency can obtain six frequency doubling millimetre wave signals.
Claims (5)
1. the present invention is that a kind of phase-modulator that adopts produces six times frequency optical millimeter waves (RoF) system.
2. the basic implementation method of the present invention: the sinusoidal signal that with phase difference is the 10GHz of 180 ° drives respectively two parallel phase-modulators to produce the optical millimeter wave signal of 60GHz.
3. specific implementation step of the present invention: (1) suppresses single order sideband by the phase shift side-play amount of control phase modulator (PM); (2) coupling obtains two the three rank sidebands in left and right after subtracting each other again; (3) then by data signal modulation to light wave; (4) two three rank sidebands beat frequency in photoelectric detector, produces the i.e. millimeter wave output of six frequencys multiplication of 60GHz.
4. employing phase-modulator as claimed in claim 1 produces six times frequency optical millimeter waves RoF systems, it is characterized in that: only use phase-modulator, and relatively simple for structure, reduce system cost.
5. employing phase-modulator as claimed in claim 1 produces six times frequency optical millimeter waves RoF systems, it is characterized in that: adopt two parallel phase-modulators, the method of subtracting each other by coupling obtains two the three rank sidebands in left and right, two three rank sidebands of receiving terminal beat frequency in photoelectric detector, produce i.e. six frequencys multiplication of 60GHz, algorithm is simple, is easy to realize.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105763260A (en) * | 2016-01-16 | 2016-07-13 | 西安电子科技大学 | Device and method of generating triangular waves by using phase modulator and Sagnac ring |
| CN105911723A (en) * | 2016-05-27 | 2016-08-31 | 西安电子科技大学 | Electro-optical modulator bias control device and method based on Sagnac ring |
| CN108683457A (en) * | 2018-08-16 | 2018-10-19 | 华南师范大学 | A kind of automodulation multicarrier optical fiber wireless communications method and system |
| CN111835372A (en) * | 2019-04-18 | 2020-10-27 | 北京小米移动软件有限公司 | Radio frequency circuit and wireless communication equipment |
| CN108683457B (en) * | 2018-08-16 | 2024-05-03 | 华南师范大学 | Self-modulation multi-carrier optical fiber wireless communication method and system |
-
2013
- 2013-04-22 CN CN201310138424.XA patent/CN104113376A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105763260A (en) * | 2016-01-16 | 2016-07-13 | 西安电子科技大学 | Device and method of generating triangular waves by using phase modulator and Sagnac ring |
| CN105763260B (en) * | 2016-01-16 | 2019-01-15 | 西安电子科技大学 | The method for generating triangular wave using phase-modulator and Sagnac ring |
| CN105911723A (en) * | 2016-05-27 | 2016-08-31 | 西安电子科技大学 | Electro-optical modulator bias control device and method based on Sagnac ring |
| CN105911723B (en) * | 2016-05-27 | 2019-08-13 | 西安电子科技大学 | Electrooptic modulator bias control method based on Sagnac ring |
| CN108683457A (en) * | 2018-08-16 | 2018-10-19 | 华南师范大学 | A kind of automodulation multicarrier optical fiber wireless communications method and system |
| CN108683457B (en) * | 2018-08-16 | 2024-05-03 | 华南师范大学 | Self-modulation multi-carrier optical fiber wireless communication method and system |
| CN111835372A (en) * | 2019-04-18 | 2020-10-27 | 北京小米移动软件有限公司 | Radio frequency circuit and wireless communication equipment |
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Application publication date: 20141022 |