CN105897339B - A kind of restructural RoF systems and its method of work and application based on on-off keying adjustable light wave-filter - Google Patents
A kind of restructural RoF systems and its method of work and application based on on-off keying adjustable light wave-filter Download PDFInfo
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- CN105897339B CN105897339B CN201610506277.0A CN201610506277A CN105897339B CN 105897339 B CN105897339 B CN 105897339B CN 201610506277 A CN201610506277 A CN 201610506277A CN 105897339 B CN105897339 B CN 105897339B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25751—Optical arrangements for CATV or video distribution
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
- H04B10/25891—Transmission components
Abstract
The present invention relates to the present invention relates to a kind of restructural RoF systems based on on-off keying adjustable light wave-filter and its method of work and application.Restructural RoF systems, it is characterised in that including sequentially connected directly modulated lasers, electrooptic modulator and tuned cell；Electrooptic modulator is connected with local vibration source；Tuned cell includes the on-off keying adjustable light wave-filter that two-way is arranged in parallel, and on-off keying adjustable light wave-filter includes the adjustable light wave-filter and MZI photoswitches being arranged in series.The system is produced light using straight tune plus by the way of transfering to other localities and carries millimeter wave and modulate；In the up-conversion scheme that light carries millimeter wave, the straight mode adjusted plus transfered to other localities, which is avoided, to be realized up-conversion using two MZM or realizes up-conversion using non-linear in optical fiber or semiconductor devices, and cost is reduced while times yupin effect is realized, complexity is reduced, improves stability.
Description
Technical field
The present invention relates to a kind of restructural RoF systems and its method of work based on on-off keying adjustable light wave-filter with
Using belonging to the technical field of fiber optic communication.
Background technology
With the prevalence of intelligent terminal, the popularization of the multimedia service such as videophone HD video, and to safety
The pursuit of the high Quality of service such as tele-medicine is monitored, personal home network is developed rapidly, with multimedias such as image, videos
Indoor communications amount based on business increases suddenly.In addition, using high degree of comfort as the home network of target, it is desirable to provide nothing indoors
The high-speed multimedia access service of line meets user flexibility easily communications and entertainment demand.Except home network, other
Occasion, such as office block, industrial park, airport hall and megastore, also have as video conference, video monitoring, high speed
Multimedia accesses the wireless communication needs of contour data volume.Although optical-fiber network transmission rate can reach 10Gbit/s, end
It is wirelessly transferred, such as WiFi, WIMAX, 3G/4G cannot reach Gbit/s transmission magnitudes.It can be seen that following personal, enterprise and public
Place sharply increases wireless communication capacity demand, can propose severe challenge to existing wireless access technology at present.Access net
Diversified business is carried, it is necessary to distinguish user and business, implements different strategies, differentiation is provided for different users
Business.Meanwhile in terms of energy consumption, the communication base station number abruptly increase of telecom operators' deployment construction, and the power consumption shared by base station
Typically up to more than 70%, this will cause cellular mobile communication to face huge energy consumption crisis.
RoF light-carried wireless access systems, are the transmission mediums using optical fiber as wire link, it is possible to achieve high-bandwidth signals
Transmission, this requires corresponding Radio Link can complete the transmission of high-bandwidth signals.RoF can with various networks (2G,
3G, 4G, WiFi, WIMAX) fusion, to reach centralized Control, shared expensive device, dynamically distributes network, the mesh for reducing cost
's.With in the merging of existing 2G/3G mobile communication system, RoF is mainly used in Microcell and in-door covering, as existing shifting
The supplement of dynamic communication network.It has been divided in face of the electromagnetic wave frequency range of low frequency and present situation that available band is narrow, has more ground mostly
Study carefully sight to start to invest the millimeter wave frequency band of high frequency.In millimetre-wave attenuator, the millimetre-wave attenuator of 60GHz has many advantages, such as：
Wavelength is short, with the high transmission rate for being easily achieved Gbit/s of wide, transmission rate, exempt from permissive and international adaptability, solution
The advantages that channeling problem；With the continuous improvement of microwave frequency band, to corresponding such as amplifier, wave filter, digital analog converter
A series of bandwidth requirement etc. microwave treatment devices also increases, and some even has arrived at millimere-wave band.In traditional electrical domain
On to signal processing, due to will there are the electronic bottlenecks such as response frequency, high-frequency element cost based on the microwave treatment of electronic structure
Become very expensive.So high frequency millimeter wave communication just becomes research hotspot all the time, the up-conversion side of millimeter wave is carried in light
In case, using two Mach, once get Er modulators realize up-conversion, utilize the non-linear reality in optical fiber or semiconductor devices
Existing up-conversion etc., but these technologies still suffer from high cost, it is complicated, stability is inadequate the problems such as, seriously hinder its business
Industry application.
In the prior art also without a kind of device and side that on-off keying adjustable light wave-filter is applied to RoF systems
Method.On tunable optic filter, Chinese patent CN105629523A discloses a kind of adjustable light wave-filter based on lithium niobate
And its application.Adjustable light wave-filter of the present invention based on lithium niobate, the ingenious characteristic using lithium columbate crystal, based on electricity
Luminous effect changes refractive index, so as to the optical path difference of dynamic regulation adjacent waveguide, realizes the tunable range for changing device；Separately
Outside, the adjustable light wave-filter of the present invention based on lithium niobate, based on electrooptic effect by adding appropriate voltage to change in electrode
Crystal refractive index changes the phase difference of different wavelengths of light in adjacent waveguide so as to changing light path, defeated through output channel waveguide
After going out, different wave length completes demultiplexing, has expanded the tunable ability of array waveguide grating.
The content of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of based on the restructural of on-off keying adjustable light wave-filter
RoF systems.
The present invention also provides a kind of method of work of above-mentioned restructural RoF systems.
The present invention also provides a kind of the reconstruct of radio-frequency carrier multi-frequency and signal tune are carried out using above-mentioned restructural RoF systems
The method of format conversion processed.
Term explanation：
MZM：The abbreviation of Mach-Zehnder Modulator, Mach increase Dare modulator, are that input light is divided into two-way
Equal signal respectively enters two light branches of modulator.
The technical scheme is that：
A kind of restructural RoF systems based on on-off keying adjustable light wave-filter, including sequentially connected straight tune laser
Device, electrooptic modulator and tuned cell；Electrooptic modulator is connected with local vibration source；Tuned cell includes the switch that two-way is arranged in parallel
Keying adjustable light wave-filter, on-off keying adjustable light wave-filter include the adjustable light wave-filter and MZI light being arranged in series
Switch.
Preferably, the output terminal of tuned cell is connected with remote antenna unit.
Preferably, the output terminal of electrooptic modulator is connected by the input terminal of erbium-doped fiber amplifier and tuned cell.
Preferably, the electrooptic modulator is MZM；Adjustable light wave-filter is AWG adjustable light wave-filters.AWG is adjustable
Humorous wave filter is a kind of adjustable light wave-filter based on lithium niobate, including be sequentially overlapped from top to bottom setting upper limiting layer,
Lithium niobate waveguides layer and lower limit layer；The upper surface of upper limiting layer is provided with top electrode, and the lower surface of lower limit layer is provided with down
Electrode.The lithium niobate waveguides layer is provided with the LiNbO_3 film of array waveguide grating for upper surface；The top electrode includes phase
The even number waveguide electrode and odd number waveguide electrode of mutual grafting；When odd even WAVEGUIDE LOADED in-phase voltage, realize that centre wavelength is adjustable；
Realize that passband width is adjustable when WAVEGUIDE LOADED has reverse electrode voltage.MZI photoswitches control two-arm by loading electrode voltage
Phase difference so that two-way light emergent power extreme value after interference, realizes that (the visible Chinese patent of concrete structure discloses switch on and off
Number a kind of adjustable light wave-filter and its application based on lithium niobate disclosed in CN105629523A).
A kind of method of work of above-mentioned restructural RoF systems, including step are as follows, and baseband signal passes through directly modulated lasers tune
To make on light carrier, the light carrier of directly modulated lasers output enters MZM, and the sine wave signal that local vibration source produces is loaded on MZM,
The phase and DC offset voltage of adjustment loading sine wave signal in the upper and lower two-arm of MZM, MZM output double sideband modulation letters
Number DSB；Double sideband modulation signal DSB enters tuned cell；Upper and lower two-way tunable optic filter filters out arbitrary order sideband respectively；Control
Electrode voltage of the system loading on MZI photoswitches, the orderly break-make of MZI photoswitches dynamic, two-way adjustable light wave-filter filter out
Sideband signals synchronous transfer or time multiplexed transmission.
Preferably, double sideband modulation signal DSB is after erbium-doped fiber amplifier amplifies, into tuned cell.
Preferably, the baseband signal is the baseband signal of gigabit magnitude.
It is a kind of to carry out the reconstruct of radio-frequency carrier multi-frequency and format modulation signal conversion using above-mentioned restructural RoF systems
Method, including step are as follows：
1) the restructural pattern of radio frequency carrier frequency
A1, by loading control sequence on MZI photoswitches control the electrode voltage on two MZI photoswitches to make MZI
Photoswitch all-pass；
The driving voltage of A2, adjustment loading on two-way adjustable light wave-filter, is filtered device centre wavelength and passband
Width tunes, and filters out single order single-side belt, second order single-side belt or centered carrier；
A3, transmit after carrying the signal multiplexing of any two sideband by optical fiber, and in distal end, receiving terminal carries out optical heterodyne
Receive a variety of frequencys multiplication for realizing signal.
Microwave signal passes through the processing such as power amplifier for users to use.
2) format modulation signal translative mode
Electrode voltage on B1, adjustment adjustable light wave-filter, changes passband width, is only filtered per road adjustable light wave-filter
Go out the single sideband singal and centered carrier of single order；Such as the upper path filter of adjustment makes it to be carried by single order upper side band and center
Ripple, lower path filter pass through single order lower sideband and centered carrier.So after photoswitch of the sideband by orderly break-make, in time domain
Upper rank sideband and lower rank sideband signals waveform are no longer continuous.
B2, when loading the control sequence on MZI photoswitches be OOK signal modulation sequences NRZ sequences when, it is specified that control
When sequence is 0 or 1, upper and lower two MZI photoswitches have path all the way；
B3, the two paths of signals exported per road adjustable light wave-filter are multiplexed together, and produce the microwave of BPSK modulation formats
Signal.After two paths of signals is multiplexed together, the signal according to NRZ sequential successively assembled arrangement can be regarded as, become in time domain
Whole signal.Due to being π by phase difference between the modulated double-sideband signal lower sideband signals of MZM, so after multiplexing
Optical signal when there are two paths of signals alternate combinations up and down, just occur π phase differences, that is, OOK signal modulations sequence occurs 0
During with 1 alternating, there is phase difference π in multiplexed signals, and modulated signal is equivalent to the modulation format of BPSK.Signal passes through optical fiber multiplexing
Transmission, carries out optical heterodyne reception in remote antenna unit, just generates the microwave signal of BPSK modulation formats.
Preferably, the step of remote antenna unit feedback areas channel usage is further included after step A3, central office root
According to driving voltage of the message adjustment loading of remote antenna unit feedback on adjustable light wave-filter, filter center ripple is controlled
Long and passband width, filters the sideband signals of different orders, in remote antenna unit after the transmission of optical sideband signal multiplexing
Optical heterodyne reception is carried out, forms the frequency multiplication of multi-frequency.The step realizes the structure of dynamic multi-frequency section RoF networks, realizes
The switching at runtime of a variety of rf frequencies in RoF systems.
On central office：In RoF systems, remote antenna unit (base station) is only comprising these simple work(of opto-electronic conversion power amplifier
Can, resource management and signal processing concentrate on central station, and such architecture of base station is simple, convenient deployment, and cost is low.Central station is shared
Ability is strong, easy to manage maintenance, scheduling of resource concentratedly.
Preferably, under format modulation signal translative mode, when control sequence of the loading on MZI photoswitches becomes for NRZ
During the differential encoding sequence got in return, the microwave signal of DPSK modulation formats is produced.Analyzed in digital modulation principle, volume of checking the mark
Code modulation sequence is the relocatable code converted by OOK modulation sequences, is still ' 0 ' and ' 1 ' sequence.So analogy BPSK tune
The method of format conversion processed, as long as sequence of the loading on on-off keying adjustable light wave-filter is differential encoding sequence, with regard to energy
Realize that signal is changed from OOK modulation formats to DPSK modulation formats.
Beneficial effects of the present invention are：
1st, the restructural RoF systems of the present invention based on on-off keying adjustable light wave-filter, are adjusted plus are transfered to other localities using straight
Mode produce light and carry and millimeter wave and modulate；In the up-conversion scheme that light carries millimeter wave, the straight mode adjusted plus transfered to other localities avoids
Up-conversion is realized using two MZM or realizes up-conversion using non-linear in optical fiber or semiconductor devices, is realizing that frequency multiplication imitates
Cost is reduced while fruit, complexity is reduced, improves stability；
2nd, the radio frequency carrier frequency of the restructural RoF systems of the present invention based on on-off keying adjustable light wave-filter
Restructural pattern, carries out linear filter, during the two paths of signals filtered out can be respectively by two-way filter to double-sideband signal
Any two in heart carrier wave, single order lower sideband, second order lower sideband；So two-way plain edge band signal passes through multiplexing transmission
Afterwards, optical heterodyne reception is carried out in remote antenna unit, a variety of times of yupin effects can be produced；This radio frequency switching in RoF systems
Technology can realize the structure of RoF reconfigurable networks, complete radiofrequency signal multi-frequency switching at runtime in RoF systems；
3rd, the format modulation signal of the restructural RoF systems of the present invention based on on-off keying adjustable light wave-filter turns
Mold changing formula, solves the shortcomings that straight tune adds investigation mission outside the city or town RoF systems to produce OOK signals；Take a message according to upper side band signal and below
Number phase difference for π principle, using on-off keying adjustable light wave-filter, by NRZ sequences filter out successively upper side band or under
Sideband, carries out optical heterodyne reception after multiplexing transmission, radiofrequency signal is bpsk signal in remote antenna unit；By by NRZ sequences
Become the differential encoding sequence brought and filter out upper side band or lower sideband successively, carried out after multiplexing transmission in remote antenna unit outside light
Poor reception, radiofrequency signal are dpsk signal；Being wirelessly transferred middle phase-modulation has the characteristics that constant amplitude, in antinoise and resists
There is advantage, therefore BPSK modulation and DPSK modulation are modulated advantageously relative to OOK in terms of non-thread sexuality；
4th, the restructural RoF systems of the present invention based on on-off keying adjustable light wave-filter, utilize AWG tunable opticals
Wave filter and MZI photoswitches integrate sideband signals are filtered, the processing such as dynamic break-make, realize the radiofrequency signal of whole system
Multi-frequency switching at runtime, the dynamic adjustable function of format modulation signal conversion；Under the coordination of center control instruction, completely may be used
To realize the switching at runtime of multiband, dual signal modulation format, become the multiple services transmission network of carrying；
5th, the restructural RoF systems of the present invention based on on-off keying adjustable light wave-filter, use AWG tunable opticals
Wave filter, which has the advantages of centre wavelength, the accurate adjustable and passband width of passband width is narrow, so filtering out side
During band signal, useful signal is cleaner, and big noise and redundant signals will not be produced in transmitting procedure, improves letter
Number transmission quality.
Brief description of the drawings
Fig. 1 is the structure diagram of the restructural RoF systems of the present invention based on on-off keying adjustable light wave-filter；
Fig. 2 is the structure diagram of on-off keying adjustable light wave-filter of the present invention；
Fig. 3 is the waveform schematic diagram that OOK signals are converted to bpsk signal and dpsk signal；
Fig. 4 is the structure diagram of MZM of the present invention.
Embodiment
With reference to embodiment and Figure of description, the present invention will be further described, but not limited to this.
Embodiment 1
As shown in Figs. 1-2.
A kind of restructural RoF systems based on on-off keying adjustable light wave-filter, including sequentially connected straight tune laser
Device, electrooptic modulator and tuned cell；Electrooptic modulator is connected with local vibration source；Tuned cell includes the switch that two-way is arranged in parallel
Keying adjustable light wave-filter, on-off keying adjustable light wave-filter include the adjustable light wave-filter and MZI light being arranged in series
Switch.
Embodiment 2
Restructural RoF systems based on on-off keying adjustable light wave-filter as described in Example 1, its difference lies in,
The output terminal of tuned cell is connected with remote antenna unit.
Embodiment 3
Restructural RoF systems based on on-off keying adjustable light wave-filter as described in Example 1, its difference lies in,
The output terminal of electrooptic modulator is connected by erbium-doped fiber amplifier (i.e. EDFA in Fig. 1) with the input terminal of tuned cell.
Embodiment 4
As shown in Figure 4.
Restructural RoF systems based on on-off keying adjustable light wave-filter as described in Example 1, its difference lies in,
The electrooptic modulator is MZM；Adjustable light wave-filter is AWG adjustable light wave-filters.AWG tunable optic filters are a kind of bases
In the adjustable light wave-filter of lithium niobate, including be sequentially overlapped from top to bottom the upper limiting layer of setting, lithium niobate waveguides layer and under
Limiting layer；The upper surface of upper limiting layer is provided with top electrode, and the lower surface of lower limit layer is provided with bottom electrode.The lithium niobate ripple
Conducting shell is provided with the LiNbO_3 film of array waveguide grating for upper surface；The top electrode includes the even number waveguide electricity being mutually inserted
Pole and odd number waveguide electrode；When odd even WAVEGUIDE LOADED in-phase voltage, realize that centre wavelength is adjustable；When WAVEGUIDE LOADED has reverse electricity
Realize that passband width is adjustable during pole tension.MZI photoswitches control the phase difference of two-arm by loading electrode voltage so that two-way light
The emergent power extreme value after interference, realizes switch on and off.
Embodiment 5
The method of work of restructural RoF systems as described in embodiment 1-4, including step are as follows, and speed is 2.5Gbit/s's
OOK signals are modulated on light carrier by directly modulated lasers, and the light carrier of directly modulated lasers output enters MZM, and local vibration source produces
The sine wave signal of 15GHz is loaded on MZM, the phase and direct current of adjustment loading sine wave signal in the upper and lower two-arm of MZM
Bias voltage, the phase difference loaded in the radiofrequency signal of the upper and lower two-arm of MZM are π, DC offset voltage Vπ// 2 (VπIt is MZM
Half-wave voltage), MZM outputs double sideband modulation signal DSB；Double sideband modulation signal DSB enters tuned cell；Upper and lower two-way can
Tuning filtering device filters out arbitrary order sideband respectively；Electrode voltage of the control loading on MZI photoswitches, MZI photoswitches dynamic have
Sequence break-make, the sideband signals synchronous transfer or time multiplexed transmission that two-way adjustable light wave-filter filters out.
Embodiment 6
The method of work of restructural RoF systems as described in Example 5, difference lies in double sideband modulation signal DSB warps for it
After crossing erbium-doped fiber amplifier amplification, into tuned cell.
Embodiment 7
It is a kind of to carry out the reconstruct of radio-frequency carrier multi-frequency and signal modulation using restructural RoF systems described in embodiment 1-4
The method of format conversion, including step are as follows：
1) the restructural pattern of radio frequency carrier frequency
A1, by loading control sequence on MZI photoswitches control the electrode voltage on two MZI photoswitches to make MZI
Photoswitch all-pass；
Baseband signal is loaded into directly modulated lasers, and laser output signal is set to AE0ejωt.Light carries millimeter-wave signal and enters
MZM is modulated, and above and below MZM two-arm loadings amplitude is identical, frequency Ω, the sinusoidal local oscillation signal V that initial phase difference is θ1
(t)=cos (Ω t), V2(t)=cos (Ω t+ θ)；MZM exports double sideband modulation signalWhen sinusoidal local oscillation signal phase difference θ=π, direct current
Bias voltage is VπWhen/2, output signal is expanded into by Bessel function：
Only consider single order, second order signal, while Ein=E0ejωtBring formula into and obtain Eout≈AE0[J0(βπ)ejωt-J1(βπ)
ej(ω+Ω)t+π-J1(βπ)ej(ω-Ω)t-J2(βπ)ej(ω+2Ω)t+π-J2(βπ)ej(ω-2Ω)t], it is in ω that wherein signal, which includes angular frequency,
Heart carrier wave, the single order lower sideband that angular frequency is ω ± Ω, angular frequency are ± 2 Ω second order lower sidebands of ω, other high-order sidebands
Ignore；
The driving voltage of A2, adjustment loading on two-way adjustable light wave-filter, is filtered device centre wavelength and passband
Width tunes, and filters out single order single-side belt, second order single-side belt or centered carrier；
A3, transmit after carrying the signal multiplexing of any two sideband by optical fiber, and in distal end, receiving terminal carries out optical heterodyne
Receive a variety of frequencys multiplication for realizing signal；
Second order sideband realizes two frequencys multiplication with centered carrier or single order upper side band with single order lower sideband beat frequency, produces 30GHz
Microwave signal；Single order upper side band realizes that frequency tripling is imitated with second order lower sideband beat frequency or single order lower sideband with second order upper side band beat frequency
Fruit, produces 45GHz microwave signals；Second order upper side band realizes quadruple effect with second order lower sideband beat frequency, produces 60GHz microwaves letter
Number.
Microwave signal passes through the processing such as power amplifier for users to use.
2) format modulation signal translative mode
Electrode voltage on B1, adjustment adjustable light wave-filter, changes passband width, is only filtered per road adjustable light wave-filter
Go out the single sideband singal and centered carrier of single order；
B2, when loading the control sequence on MZI photoswitches be OOK signal modulation sequences NRZ sequences when, it is specified that control
When sequence is 0 or 1, upper and lower two MZI photoswitches have path all the way；When control sequence occurs 0, upper road MZI photoswitch paths,
Lower road MZI photoswitches open circuit；When control sequence occurs 1, upper road MZI photoswitches open circuit, lower road MZI photoswitch paths.When
In sequence, when control sequence occurs 0, single order upper side band and centered carrier are filtered off, the single order lower sideband when control sequence occurs 1
It is filtered off with centered carrier.
B3, the two paths of signals exported per road adjustable light wave-filter are multiplexed together, according to the rank sideband up and down of NRZ sequences
It is alternately arranged in the time domain of signal；It can be obtained by Bezier expansion, the phase difference of the lower sideband of double sideband modulation signal is π,
Upper and lower rank signal alternately occurs as soon as π phase differences, can regard bpsk signal as, the signal obtained after the reception of remote antenna unit
For 2A2J0(β)J1(β)cos(ωmAnd 2A t)2J0(β)J1(β)cos(ωmT+ π), radiofrequency signal is equivalent to 15GHz's after modulation
The signal of BPSK modulation formats.After two paths of signals is multiplexed together, the letter according to NRZ sequential successively assembled arrangement can be regarded as
Number, time domain becomes complete signal.Due to being by phase difference between the modulated double-sideband signal lower sideband signals of MZM
π, so when two paths of signals alternate combinations up and down occurs in multiplexed optical signal, just occurs π phase differences, that is, OOK signals
When 0 and 1 alternating occurs in modulation sequence, there is phase difference π in multiplexed signals, and modulated signal is equivalent to the modulation format of BPSK.Letter
Number by optical fiber multiplexing transmit, remote antenna unit carry out optical heterodyne reception, just generate BPSK modulation formats microwave letter
Number.
Embodiment 8
The method that restructural RoF systems carry out radio-frequency carrier multi-frequency reconstruct as described in Example 7, its difference lies in,
The step of remote antenna unit feedback areas channel usage is further included after step A3, central office is anti-according to remote antenna unit
Driving voltage of the message adjustment loading of feedback on adjustable light wave-filter, controls filter center wavelength and passband width, right
The sideband signals of different orders are filtered, and optical heterodyne reception is carried out in remote antenna unit after the transmission of optical sideband signal multiplexing,
Form the frequency multiplication of multi-frequency.The step realizes the structure of dynamic multi-frequency section RoF networks, realizes a variety of in RoF systems penetrate
The switching at runtime of frequent rate.
Embodiment 9
The method that restructural RoF systems carry out format modulation signal conversion as described in Example 7, difference lies in believing for it
Under number modulation format translative mode, when control sequence of the loading on MZI photoswitches is the differential encoding sequence that NRZ is converted
When, the microwave signal of generation DPSK modulation formats.Analyzed in digital modulation principle, coded modulation of checking the mark sequence is by OOK tune
Sequence transformation processed and come relocatable code, be still ' 0 ' and ' 1 ' sequence.So the method for analogy BPSK modulation formats conversion, only
The sequence loaded on on-off keying adjustable light wave-filter is differential encoding sequence, can be achieved with signal and modulates lattice from OOK
Formula is changed to DPSK modulation formats.The signals of OOK modulation formats is illustrated in figure 3 to BPSK modulation formats and DPSK modulation formats
Transition diagram.
Claims (10)
1. a kind of restructural RoF systems based on on-off keying adjustable light wave-filter, including sequentially connected directly modulated lasers,
Electrooptic modulator；The electrooptic modulator is connected with local vibration source；It is characterized in that, the electrooptic modulator is also associated with tuning list
Member；Tuned cell includes the on-off keying adjustable light wave-filter that two-way is arranged in parallel, on-off keying adjustable light wave-filter bag
Include the adjustable light wave-filter being arranged in series and MZI photoswitches.
2. the restructural RoF systems according to claim 1 based on on-off keying adjustable light wave-filter, its feature exist
In the output terminal of tuned cell is connected with remote antenna unit.
3. the restructural RoF systems according to claim 1 based on on-off keying adjustable light wave-filter, its feature exist
In the output terminal of electrooptic modulator is connected by the input terminal of erbium-doped fiber amplifier and tuned cell.
4. the restructural RoF systems according to claim 1 based on on-off keying adjustable light wave-filter, its feature exist
In the electrooptic modulator is MZM；Adjustable light wave-filter is AWG adjustable light wave-filters.
A kind of 5. method of work of restructural RoF systems as claimed in claim 4, it is characterised in that, base band as follows including step
Signal is modulated on light carrier by directly modulated lasers, and the light carrier of directly modulated lasers output enters MZM, and local vibration source produces just
String ripple signal loading is on MZM, the phase and DC offset voltage of adjustment loading sine wave signal in the upper and lower two-arm of MZM,
MZM output double sideband modulation signals DSB；Double sideband modulation signal DSB enters tuned cell；Upper and lower two-way tunable optic filter point
Arbitrary order sideband is not filtered out；Electrode voltage of the control loading on MZI, the orderly break-make of MZI dynamics, two-way adjustable light wave-filter
The sideband signals synchronous transfer or time multiplexed transmission filtered out.
6. the method for work of restructural RoF systems according to claim 5, it is characterised in that double sideband modulation signal DSB is passed through
After crossing erbium-doped fiber amplifier amplification, into tuned cell.
7. the method for work of restructural RoF systems according to claim 5, it is characterised in that the baseband signal is lucky ratio
The baseband signal of special magnitude.
8. one kind utilize restructural RoF systems described in claim 1-4 any one carry out the reconstruct of radio-frequency carrier multi-frequency with
The method of format modulation signal conversion, it is characterised in that as follows including step：
1) the restructural pattern of radio frequency carrier frequency
A1, by loading control sequence on MZI photoswitches control the electrode voltage on two MZI photoswitches to open MZI light
Close all-pass；
The driving voltage of A2, adjustment loading on two-way adjustable light wave-filter, is filtered device centre wavelength and passband width
Tuning, filters out single order single-side belt, second order single-side belt or centered carrier；
A3, transmit after carrying the signal multiplexing of any two sideband by optical fiber, and in distal end, receiving terminal carries out optical heterodyne reception
Realize a variety of frequencys multiplication of signal；
2) format modulation signal translative mode
Electrode voltage on B1, adjustment adjustable light wave-filter, changes passband width, and one is only filtered out per road adjustable light wave-filter
The single sideband singal and centered carrier of rank；
B2, when loading the control sequence on MZI photoswitches be OOK signal modulation sequences NRZ sequences when, it is specified that control sequence
For 0 or 1 when, upper and lower two MZI photoswitches have path all the way；
B3, the two paths of signals exported per road adjustable light wave-filter are multiplexed together, and produce the microwave signal of BPSK modulation formats.
9. the method that restructural RoF systems according to claim 8 carry out radio-frequency carrier multi-frequency reconstruct, its feature exist
In the step of remote antenna unit feedback areas channel usage is further included after step A3, central office is according to remote antenna list
Driving voltage of the message adjustment loading of member feedback on adjustable light wave-filter, controls filter center wavelength and passband wide
Degree, filters the sideband signals of different orders, and optical heterodyne is carried out in remote antenna unit after the transmission of optical sideband signal multiplexing
Receive, form the frequency multiplication of multi-frequency.
10. the method that restructural RoF systems according to claim 8 carry out format modulation signal conversion, it is characterised in that
Under format modulation signal translative mode, when control sequence of the loading on MZI photoswitches is the differential encoding that NRZ is converted
During sequence, the microwave signal of DPSK modulation formats is produced.
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