CN101090300A - Method for generating and transmitting multi-wave signal in light carrier radio communication system - Google Patents
Method for generating and transmitting multi-wave signal in light carrier radio communication system Download PDFInfo
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- CN101090300A CN101090300A CNA2007100437386A CN200710043738A CN101090300A CN 101090300 A CN101090300 A CN 101090300A CN A2007100437386 A CNA2007100437386 A CN A2007100437386A CN 200710043738 A CN200710043738 A CN 200710043738A CN 101090300 A CN101090300 A CN 101090300A
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Abstract
This invention relates to a method for generating and transmitting signals of multiple bands in the optical carrier radio communication system including: applying a standard double parallel Mach Mr modulator and a standard single-arm Mach Mr modulator, in which, the double-parallel modulator is driven by sub-carrier and baseband data, the single arm one is driven by RF signals and baseband data, optical microwave signal and millimeter signal are got on the optical carrier by an optical carrier suppression technology and flexible spectrum shift and separated by an optical filter and converted photoelectrically to get signals of baseband, microwave and millimeter wave on the electric field.
Description
Technical field
The present invention relates to the method in a kind of optical communication technique field, specifically, is a kind of the generation in light carrier radio communication system and the method for transmitting multi-wave signal.
Background technology
Light carrier radio communication is a kind of emerging technology, and it utilizes low-loss, the high bandwidth characteristic of optical fiber mainly in conjunction with optical fiber and radio communication two big technology, promote the bandwidth and the mobility of wireless access network, the wireless access service of " at any time, everywhere, any business " is provided for the user.Compare with traditional wireless system, light carrier radio communication system has wider honeycomb to cover, higher bandwidth, lower deployment cost, advantages such as lower power consumption and easy installation.Simultaneously, in the optical communication in future, also need to utilize optical fiber technology transmission broadband wire signal, fiber-to-the-home wired access service promptly is provided.Therefore, the service provider presses for an integrated transmission platform, and wireless and cable business centralized integration in same network configuration, is reduced deployment cost, satisfies user's individual demand.Multi-band transmission technology based on light carrier radio communication system can be transmitted base band, microwave and millimeter-wave signal simultaneously in same fiber basis facility, for different terminal uses provides diversified business, it demonstrates huge cost advantage and uses potential flexibly in wired and wireless mixed light access service network in the future.
Find through literature search prior art, people such as K.Ikeda are published in 2003 the 21st volumes of scholarly publication " IEEEJournal of lightwave technology " (" IEEE lightwave technology periodical "), in " Simultaneous Three-Band Modulation and Fiber-Optic Transmission of2.5-Gb/s Baseband; Microwave-; and 60-GHz-Band Signals on a SingleWavelength (triband modulation simultaneously and optical transmission 2.5-Gb/s base band in single wavelength; microwave and 60-GHz-band signal) ", mention the base band of using single wavelength to transmit 2.5-Gb/s simultaneously, the millimeter-wave signal of microwave and 60-GHz, this scheme at first adopts the superpose signal of telecommunication of three wave bands of two electric adder circuits on electric territory, the multiband signal of telecommunication with stack drives high-speed electrical absorption modulator then, is implemented in while transmitting multi-wave signal in the light-carried wireless system.But the signal processing more complicated on this scheme electricity territory, resistance noise is bigger, and multi-wave signal can influence each other in the process of modulation, thus the performance of the system that declined.And in this scheme, need use high frequency millimeter-wave signal source and high-speed modulator, cause the deployment cost of system to improve greatly.
Summary of the invention
The objective of the invention is to overcome above-mentioned prior art deficiency, a kind of generation in light carrier radio communication system and the method for transmitting multi-wave signal proposed, adopt the two parallel Mach zehnder modulators of a low speed and the single armed Mach zehnder modulators of a low speed, suppress and frequency removal method flexibly by light carrier, make it produce baseband signal, microwave signal and high frequency millimeter-wave signal simultaneously.The present invention has very strong flexibility and extensibility, if adopt high speed device, can rise to the above frequency range of 100-GHz easily.
The present invention is achieved by the following technical solutions, the present invention includes following steps:
Step 2, provide base band data and radiofrequency signal with data source, obtain subcarrier signal by base band data and radiofrequency signal mixing, this subcarrier signal drives the first sub-modulator, the first sub-modulator is biased in the minimum point of the first sub-modulator, obtain the optical sub-carrier signal that a light carrier suppresses, its repetition rate is the twice radio frequency signal frequency.Another base band data that provides with data source drives the second sub-modulator then, and bias point is arranged on the mid portion of the second sub-modulator peak point and minimum point, obtains being modulated at the amplitude-shift keying signal on the light carrier.
Described subcarrier signal, the base band data and the radiofrequency signal that are provided by data source obtain by an electric frequency mixer mixing.
The radiofrequency signal of described driving single armed Mach zehnder modulators, its frequency is identical with radio frequency signal frequency in the subcarrier signal that mixing obtains, after the double-sideband modulation technology that adopts the light carrier inhibition, the frequency spectrum of the first sub-modulator output signal is shifted on carrier wave and four sidebands, and the frequency spectrum of the second sub-modulator output signal is shifted on the secondary sideband.
The double-sideband modulation technology that described light carrier suppresses be meant that radiofrequency signal is moved the both sides of light carrier with behind the radiofrequency signal modulated optical carrier, but light carrier is suppressed, and obtains the light signal that repetition rate is the twice radio frequency signal frequency like this.
The output of the described first sub-modulator is by after the single armed Mach zehnder modulators modulation, and the base band data and the data on the optical millimeter wave that are positioned on the light carrier that obtain are same, therefore wiredly can share same data, services with the wireless user.And the data-signal on the light microwave is different with data-signal on base-band data signal and the optical millimeter wave.
What the described first sub-modulator obtained is the signal that light carrier suppresses, and the second sub-modulator obtains is signal on the light carrier, so the signal of the output signal of two sub-modulators gained after main Mach zehnder modulators end is in conjunction with addition is positioned at corresponding separately frequency range, and is separate between them.
Step 4, at receiving terminal, with multi-wave signal on the optical filter separated light territory, the signal of separation finally obtains base band, microwave and millimeter wave on the electric territory respectively after detecting through separately optical receiver.
Described optical filter is realized in conjunction with Fiber Bragg Grating FBG by circulator.At first from multi-wave signal, isolate baseband signal with the first order optical filter of a circulator and a Fiber Bragg Grating FBG composition.Isolate multi-wave signal after the baseband signal and be input in the second level optical filter of forming in second circulator and second Fiber Bragg Grating FBG, separate bright dipping microwave and optical millimeter wave signal.
The present invention is by above step, adopt the signal source of low speed and the modulator of low speed, double-sideband modulation and frequency removal method based on the light carrier inhibition, just can produce the microwave signal that comprises base band, twice radio frequency signal frequency and the millimeter-wave signal of four times of radio frequency signal frequency, do not need expensive high-speed modulator and high speed millimeter wave signal source, therefore greatly reduce the deployment cost of system.For example, if light carries the millimeter wave of transmission 120-GHz, scheme in the past needs high-speed modulator and the high speed millimeter wave signal source of 120-GHz, and this cost is very expensive, and our scheme only needs the modulator of 30-GHz and light that signal source just can produce 120-GHz to carry millimeter wave.And multi-wave signal adopts the method for full light generation, do not need to adopt a plurality of electric adder circuit stack signals of telecommunication on the electricity territory, therefore the signal processing on the electric territory is simple, and in the process of modulation, multi-wave signal is separate, has effectively avoided mutual interference among signals.Multi-wave signal obtains by modulating single wavelength in addition, is easier to carry out the wavelength centralized management of multi-wave signal.
Description of drawings
Fig. 1 is principle of the invention figure;
Fig. 2 is an embodiment of the invention schematic diagram;
Fig. 3 is embodiment of the invention figure as a result.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, be principle of the invention figure, subcarrier signal and a base-band data signal drive two rf inputs of the two parallel Mach zehnder modulators of a standard respectively, two parallel Mach zehnder modulators by two on main Mach zehnder modulators and two arms thereof the parallel and identical first sub-modulator and the second sub-modulator form.Wherein the first sub-modulator is biased in the minimum point of the first sub-modulator, produces the optical sub-carrier signal that light carrier suppresses; The second sub-modulator is biased in the minimum point of the second sub-modulator and the middle place of peak, produces the amplitude-shift keying signal that is positioned on the light carrier.With the output signal of the two parallel Mach zehnder modulators of single armed Mach zehnder modulators modulation, single armed Mach zehnder modulators also is biased in minimum point then.By adopting light carrier to be suppressed and the frequency spectrum shift technology, the output of the first sub-modulator obtains the optical millimeter wave signal of baseband signal and four times of radio frequency signal frequency through behind the frequency spectrum shift; The second sub-modulator obtains the light microwave signal of twice radio frequency signal frequency through the frequency spectrum shift of the same manner.Utilize this simple design, in light carrier radio communication system, can produce the multi-wave signal on the light territory very flexibly.At last, with the multi-wave signal on the optical filter separated light territory, after the receiver by separately carries out opto-electronic conversion, just can obtain baseband signal, microwave signal and millimeter-wave signal on the electric territory.Baseband signal on the electricity territory is sent to the terminal use by cable access network, and microwave on the electric territory and millimeter-wave signal are sent to the terminal use by antenna in the mode of Radio Access Network.
As shown in Figure 2, be specific embodiments of the invention.It is the continuous light wave of 1548.86-nm that laser provides wavelength, and this continuous light wave is input to two parallel Mach zehnder modulators.The continuous light ripple is divided into two-way in two parallel Mach zehnder modulators, enters into the first sub-modulator and the second sub-modulator respectively.Wherein subcarrier signal reaches 2 by the length of the non-return-to-zero of 1.25-Gbps
7-1 PRBS pseudo-random bit sequence PRBS1 and the mixing of 10-GHz radiofrequency signal obtain, and are used for driving the first sub-modulator, and are biased in the minimum point of the first sub-modulator, produce the optical sub-carrier signal of the carrier suppressed of 20-GHz; Length with the non-return-to-zero of 1.25-Gbps reaches 2
7-1 PRBS pseudo-random bit sequence PRBS2 drives the second sub-modulator, and is biased in the middle place of the second sub-modulator minimum point and peak, produces the amplitude-shift keying signal on the light carrier.Regulate the biasing of main Mach zehnder modulators then, making the output of two parallel Mach zehnder modulators is additions of two sub-modulator output signals, the output signal of two parallel Mach zehnder modulators enters into the single armed Mach zehnder modulators of a cascade, this modulator is by the radio frequency signals drive of 10-GHz, also be biased in minimum point, the output of two parallel Mach zehnder modulators is carried out obtaining base band, 20-GHz microwave, 40-GHz millimeter-wave signal on the light territory after light carrier suppresses modulation and frequency spectrum shift.The multi-wave signal that produces obtains the luminous power of 6.5-dBm through behind the erbium-doped fiber amplifier, and leads to the spontaneous emission noise of optical filter filtering erbium-doped fiber amplifier with an adjustable band.After 25 kilometers Optical Fiber Transmission, arrive receiving terminal.At receiving terminal, light signal enters into that (the 3-dB bandwidth is 0.1-nm with first Fiber Bragg Grating FBG by first circulator, reflectivity is 90%) first order optical filter formed, baseband signal on the carrier wave is separated from multi-wave signal, isolate multi-wave signal after the baseband signal again by (the 3-dB bandwidth is 0.2-nm by second circulator and second Fiber Bragg Grating FBG, reflectivity is 90%) second level optical filter formed, with the millimeter-wave signal of the microwave signal of 20-GHz and 40-GHz separately.The multi-wave signal that separates finally obtains base band, the microwave of 20-GHZ and the millimeter wave of 40-GHz on the electric territory respectively after detecting through separately optical receiver.
As shown in Figure 3, be the result of present embodiment.Fig. 3 (a) is the waveform of the subcarrier signal that obtains after 1.25-Gbps base band data and the mixing of 10-GHz radiofrequency signal, because the influence of direct current and low-frequency component in the base band data in the optical mixing process has certain amplitude on 0 level; (b-i)-(b-iii) be respectively to drive the first sub-modulator with subcarrier signal, waveform, eye pattern and the spectrum of the light signal that employing light carrier inhibition technology obtains.Subcarrier waveform on the waveform of optical sub-carrier and the electric territory is corresponding fully, what obtain as can be seen from eye pattern is that repetition rate is the light signal of twice radio frequency signal frequency, as can be seen, light carrier suppresses to surpass 10-db, obtains the repressed double-sideband signal of carrier wave from the spectrum; (c) be with another 1.25-Gbps data-driven second sub-modulator, the spectrum of the light signal that obtains; (d) be the spectrum of the output signal of two parallel Mach zehnder modulators, as can be seen, it is the stacks of two sub-modulator outputs, the last amplitude of carrier wave and the about poor 3db of the amplitude of sideband from the spectrum; (e-i) and (e-ii) be respectively the output of modulating the second sub-modulator with single armed Mach zehnder modulators, the spectrum and the eye pattern of the 20-GHz light microwave signal that obtains, as can be seen, light carrier suppresses to surpass 10-db from the spectrum; (f) be the output of modulating the first sub-modulator with single armed Mach zehnder modulators, the spectrum of base band that obtains and 40-GHz optical millimeter wave signal, as can be seen, through behind the frequency spectrum shift, repetition rate is that the signal frequency side band of 20GHz is suppressed above 10-db from the spectrum; (g) be with 10-GHz radio frequency signals drive single armed Mach zehnder modulators, the multi-wave signal that obtains is through the spectrum after amplifying, and as can be seen, the amplitude of carrier wave is the highest from the spectrum, and 40-GHz optical millimeter wave signal and carrier wave differ about 5db.This is because by behind light carrier inhibition and the frequency spectrum shift, stack has taken place the signal on the carrier wave; (h) be the spectrum of isolated baseband signal from multi-wave signal, as can be seen, residual light microwave and millimeter wave sideband arranged from the spectrum, this is because filter is not desirable filter,, the undesired signal of filtering fully; (i) be the signal spectrum of isolating after the baseband signal, as can be seen, the left and right sides sideband of 40-GHz optical millimeter wave signal is not a symmetry fully from the spectrum, and this is owing to filter causes temperature and wavelength sensitive; (j-i) and (j-ii) be the spectrum and the eye pattern of isolated 20-GHz light microwave signal; Equally, incomplete filter makes that have other residual sideband composition to have (k) is the spectrum of isolated 40-GHz optical millimeter wave signal, as can be seen, the inhibition of other sideband has also been surpassed 10-db from the spectrum; (l) be the electric eye figure of baseband signal, though be subjected to the interference of residual other sideband composition, because baseband signal is insensitive to the nonlinear effect in the Optical Fiber Transmission, so eye pattern is best; (m) be the electric eye figure of microwave signal; (n) be the electric eye figure of millimeter-wave signal.Because microwave and millimeter-wave signal are vulnerable to the influence of nonlinear effect in Optical Fiber Transmission, and the interference of other residual sideband composition, though eye diagram quality is poor slightly, still can obtain not having the transmission of error code.
Claims (10)
1. one kind produces in light carrier radio communication system and the method for transmitting multi-wave signal, it is characterized in that, comprises the steps:
Step 1, at transmitting terminal, modulate the continuous light wave that provides by laser with the two parallel Mach zehnder modulators of a standard, light wave is divided into two-way in two parallel Mach zehnder modulators continuously, enters into the first sub-modulator and the second sub-modulator of two parallel Mach zehnder modulators respectively;
Step 2, the base band data and the radiofrequency signal mixing that provide with data source obtain subcarrier signal, drive the first sub-modulator with this subcarrier signal, the first sub-modulator is biased its minimum point, obtain the optical sub-carrier signal that a light carrier suppresses, the repetition rate of this optical sub-carrier signal is the twice radio frequency signal frequency, another base band data that provides with data source drives the second sub-modulator then, the second sub-modulator bias point is provided with the mid portion of its peak point and minimum point, obtains being modulated at the amplitude-shift keying signal on the light carrier;
Step 3, the bias voltage that the main Mach zehnder modulators of two parallel Mach zehnder modulators is set equals the changing voltage of main Mach zehnder modulators, make the output addition of two sub-modulators, signal after the addition is input to the single armed Mach zehnder modulators of a standard, this single armed Mach zehnder modulators radio frequency signals drive, also be biased in minimum point, the output of the first sub-modulator is through behind the frequency spectrum shift, obtain the optical millimeter wave signal of base band and four times of radio frequency signal frequency, the output of the second sub-modulator is through behind the frequency spectrum shift with quadrat method, produce the light microwave signal of twice radio frequency signal frequency, obtain the multi-wave signal on the light territory;
Step 4, at receiving terminal, with multi-wave signal on the optical filter separated light territory, the signal of separation finally obtains base band, microwave and millimeter wave on the electric territory respectively after detecting through separately optical receiver.
2, according to claim 1 in light carrier radio communication system, the generation and the method for transmitting multi-wave signal, it is characterized in that, the described first sub-modulator and the second sub-modulator are identical, and are arranged on abreast on main Mach zehnder modulators two arms of two parallel Mach zehnder modulators.
3. according to claim 1 and 2 in light carrier radio communication system, the generation and the method for transmitting multi-wave signal, it is characterized in that, the signal of the output addition gained of the described first sub-modulator and the second sub-modulator is positioned at corresponding separately frequency range, and is separate between them.
4. according to claim 1 the generation in light carrier radio communication system and the method for transmitting multi-wave signal is characterized in that described subcarrier signal is obtained by an electric frequency mixer mixing by base band data and the radiofrequency signal that data source provides.
5. according to claim 1 in light carrier radio communication system, the generation and the method for transmitting multi-wave signal, it is characterized in that, the radiofrequency signal of described driving single armed Mach zehnder modulators, its frequency is identical with radio frequency signal frequency in the subcarrier signal that mixing obtains.
6. according to claim 1 in light carrier radio communication system, the generation and the method for transmitting multi-wave signal, it is characterized in that, described frequency spectrum shift, after being meant the double-sideband modulation technology that adopts the light carrier inhibition, the output of the first sub-modulator and the second sub-modulator is moved respectively on the position of carrier wave, secondary sideband and four sidebands, thereby obtaining multi-wave signal, multi-wave signal lays respectively at corresponding separately frequency range, and is separate between each frequency range.
7, according to claim 6 in light carrier radio communication system, the generation and the method for transmitting multi-wave signal, it is characterized in that, the double-sideband modulation technology that described light carrier suppresses, be meant with behind the radiofrequency signal modulated optical carrier, radiofrequency signal is moved the both sides of light carrier, but light carrier is suppressed, and obtains the light signal that repetition rate is the twice radio frequency signal frequency like this.
8. according to claim 1 in light carrier radio communication system, the generation and the method for transmitting multi-wave signal, it is characterized in that, after the output of the first sub-modulator is modulated by single armed Mach zehnder modulators, the base band data and the data on the optical millimeter wave that are positioned on the light carrier that obtain are same, wiredly can share same data, services, and the data-signal on the light microwave is different with data-signal on base band and the optical millimeter wave with the wireless user.
9. according to claim 1 the generation in light carrier radio communication system and the method for transmitting multi-wave signal is characterized in that described optical filter is realized in conjunction with Fiber Bragg Grating FBG by circulator.
10. according to claim 9 in light carrier radio communication system, the generation and the method for transmitting multi-wave signal, it is characterized in that, described circulator and a Fiber Bragg Grating FBG are formed first order optical filter, this first order optical filter is isolated baseband signal from multi-wave signal, isolate multi-wave signal after the baseband signal and be input in the second level optical filter of forming by second circulator and second Fiber Bragg Grating FBG, separate bright dipping microwave and optical millimeter wave signal.
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| CN110808789A (en) * | 2019-11-12 | 2020-02-18 | 中国舰船研究设计中心 | Ultra-wideband high-frequency electromagnetic environment signal generation method based on optical heterodyne technology |
| CN111654328A (en) * | 2020-04-11 | 2020-09-11 | 复旦大学 | Wired and wireless mixed signal generation system based on single optical modulator |
| WO2023082085A1 (en) * | 2021-11-10 | 2023-05-19 | 华为技术有限公司 | Signal processing system and terminal device |
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