CN105897339A - Reconfigurable RoF system based on on-off keying tunable optical filters as well as working method and application of reconfigurable RoF system - Google Patents
Reconfigurable RoF system based on on-off keying tunable optical filters as well as working method and application of reconfigurable RoF system Download PDFInfo
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- CN105897339A CN105897339A CN201610506277.0A CN201610506277A CN105897339A CN 105897339 A CN105897339 A CN 105897339A CN 201610506277 A CN201610506277 A CN 201610506277A CN 105897339 A CN105897339 A CN 105897339A
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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
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Abstract
The invention relates to a reconfigurable RoF system based on on-off keying tunable optical filters as well as a working method and application of the reconfigurable RoF system. The reconfigurable RoF system is characterized by comprising a directly modulated laser, an electrooptical modulator and a tuning unit which are sequentially connected, wherein the electrooptical modulator is connected with a local oscillator source; the tuning unit comprises two on-off keying tunable optical filters which are connected in parallel; the on-off keying tunable optical filters comprise tunable optical filters and MZI optical switches, which are connected in series. The system adopts a direct modulating and external modulating mode to generate and modulate optical millimeter waves; in an up conversion scheme of the optical millimeter waves, the direct modulating and external modulating mode is capable of realizing up conversion with no need of utilizing two MZMs, or up conversion with no need of utilizing non-linearity of optical fibers or semiconductor devices, and is capable of lowering the cost, reducing the complexity and improving the stability while realizing a frequency multiplication effect.
Description
Technical field
The present invention relates to a kind of restructural RoF system based on on-off keying adjustable light wave-filter and method of work thereof with
Application, belongs to the technical field of fiber optic communication.
Background technology
Popular along with intelligent terminal, the multimedia service such as videophone HD video universal, and to safety
The pursuit of the monitoring contour Quality of service of tele-medicine, individual's home network is developed rapidly, with the multimedia such as image, video
The indoor communications amount that business is main increases suddenly.It addition, the home network with high degree of comfort as target, it is desirable in indoor offer nothing
The high-speed multimedia access service of line meets user flexibility communications and entertainment demand easily.Except home network, at other
Occasion, such as office block, industrial park, airport hall and megastore etc., also has as video conference, video monitoring, at a high speed
Multimedia accesses the wireless communication needs of contour data volume.Although optical-fiber network transfer rate can arrive 10Gbit/s, but end
Being wirelessly transferred, such as WiFi, WIMAX, 3G/4G can not arrive Gbit/s and transmit magnitude.Visible following individual, enterprise and public
Wireless communication capacity demand is sharply increased by place, current existing wireless access technology can be proposed severe challenge.Access network
Carry diversified business, need to distinguish user and business, implement different strategies, provide differentiation for different users
Business.Meanwhile, in terms of energy consumption, telecom operators dispose the communication base station number abruptly increase built, and the power consumption shared by base station
Typically up to more than 70%, this faces huge energy consumption crisis by causing cellular mobile communication.
RoF light-carried wireless access system, is the transmission medium using optical fiber as wire link, it is possible to achieve high-bandwidth signals
Transmission, this just requires that the wireless link of correspondence can complete the transmission of high-bandwidth signals.RoF can with various networks (2G,
3G, 4G, WiFi, WIMAX) merge, with reach centralized Control, share expensive device, dynamically distribute network, reduce cost mesh
's.In fusion with existing 2G/3G mobile communication system, RoF is mainly used in Microcell and in-door covering, as existing shifting
Supplementing of dynamic communication network.In the face of the present situation that electromagnetic wave frequency range has been divided the most and available band is narrow of low frequency, more grind
Study carefully sight and start to invest the millimeter wave frequency band of high frequency.In millimetre-wave attenuator, the millimetre-wave attenuator of 60GHz has a plurality of advantages:
Wavelength is short, with wide, the transfer rate of the high Gbit/s of being easily achieved of transfer rate, exempt from permissive and international adaptability, solution
The advantages such as channeling problem；Along with improving constantly of microwave frequency band, to corresponding such as amplifier, wave filter, digital to analog converter
Also increasing etc. the bandwidth requirement of a series of microwave treatment devices, have even has arrived at millimere-wave band.In tradition electrical domain
On to signal processing, owing to microwave treatment based on electronic structure exists the electronic bottleneck such as response frequency, high-frequency element cost will
Become much more expensive.So high frequency millimeter wave communication the most just becomes study hotspot, carry the up-conversion side of millimeter wave at light
In case, including utilizing two Mach once get Er manipulator to realize up-conversion, utilize the non-linear reality in optical fiber or semiconductor device
Existing up-conversion etc., but these technology still suffer from the problems such as high cost, structure is complicated, stability is inadequate, seriously hinder its business
Industry is applied.
Prior art does not also have a kind of device and side that on-off keying adjustable light wave-filter is applied to RoF system
Method.About tunable optic filter, Chinese patent CN105629523A discloses a kind of adjustable light wave-filter based on Lithium metaniobate
And application.Adjustable light wave-filter based on Lithium metaniobate of the present invention, the ingenious characteristic utilizing lithium columbate crystal, based on electricity
Photo effect changes refractive index, thus can dynamically regulate the optical path difference of adjacent waveguide, it is achieved change the tunable range of device；Separately
Outward, adjustable light wave-filter based on Lithium metaniobate of the present invention, change by adding appropriate voltage at electrode based on electrooptic effect
Crystal refractive index thus change light path, i.e. change the phase contrast of different wavelengths of light in adjacent waveguide, defeated through output channel waveguide
After going out, different wave length completes demultiplexing, has expanded the tunable ability of array waveguide grating.
Summary of the invention
For the deficiencies in the prior art, the present invention provides a kind of restructural based on on-off keying adjustable light wave-filter
RoF system.
The present invention also provides for the method for work of a kind of above-mentioned restructural RoF system.
The present invention also provides for one and utilizes above-mentioned restructural RoF system to carry out the reconstruct of radio-frequency carrier multi-frequency and signal tune
The method of form processed conversion.
Term illustrates:
The abbreviation of MZM:Mach-Zehnder Modulator, Mach increases Dare manipulator, is that input light is divided into two-way
Equal signal respectively enters two light branch roads of manipulator.
The technical scheme is that
A kind of restructural RoF system based on on-off keying adjustable light wave-filter, directly adjusts laser including be sequentially connected with
Device, electrooptic modulator and tuned cell；Electrooptic modulator connects 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 includes adjustable light wave-filter and the MZI light being arranged in series
Switch.
Preferably, the outfan of tuned cell connects remote antenna unit.
Preferably, the outfan of electrooptic modulator is connected with the input of tuned cell by erbium-doped fiber amplifier.
Preferably, described electrooptic modulator is MZM；Adjustable light wave-filter is AWG adjustable light wave-filter.AWG is adjustable
Humorous wave filter is a kind of adjustable light wave-filter based on Lithium metaniobate, 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 electrode, and the lower surface of lower limit layer is provided with down
Electrode.Described lithium niobate waveguides layer is the LiNbO_3 film that upper surface is provided with array waveguide grating；Described upper electrode includes phase
The even number waveguide electrode of mutual grafting and odd wave conductive electrode；When odd even WAVEGUIDE LOADED in-phase voltage, it is achieved centre wavelength is adjustable；
Passband width is realized adjustable when WAVEGUIDE LOADED has reverse electrode voltage.MZI photoswitch controls two-arm by loading electrode voltage
Phase contrast so that two-way light emergent power extreme value after interference, it is achieved (Chinese patent seen from concrete structure is open for switch on and off
A kind of adjustable light wave-filter based on Lithium metaniobate and application thereof disclosed in number CN105629523A).
The method of work of a kind of above-mentioned restructural RoF system, as follows including step, baseband signal is adjusted by directly modulated lasers
Making 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,
Adjust phase place and the DC offset voltage being carried in sine wave signal in the upper and lower two-arm of MZM, MZM output double sideband modulation letter
Number DSB；Double sideband modulation signal DSB enters tuned cell；Two-way tunable optic filter leaches arbitrary order sideband respectively up and down；Control
System is carried in the electrode voltage on MZI photoswitch, and MZI photoswitch dynamically orderly break-make, two-way adjustable light wave-filter leaches
Sideband signals synchronous transfer or time multiplexed transmission.
Preferably, double sideband modulation signal DSB, after erbium-doped fiber amplifier amplifies, enters tuned cell.
Preferably, described baseband signal is the baseband signal of gigabit magnitude.
A kind of utilize above-mentioned restructural RoF system carry out radio-frequency carrier multi-frequency reconstruct and format modulation signal conversion
Method, comprises the following steps that
1) the restructural pattern of radio frequency carrier frequency
A1, the electrode voltage controlled on two MZI photoswitches by the control sequence that is carried on MZI photoswitch make MZI
Photoswitch all-pass；
A2, adjustment are carried in the driving voltage on two-way adjustable light wave-filter, are filtered device centre wavelength and passband
Width tunes, and leaches single order single-side belt, second order single-side belt or centered carrier；
A3, carry after the signal multiplexing of any two sideband through fiber-optic transfer, carry out optical heterodyne at far-end receiving terminal
Receive the multiple frequency multiplication realizing signal.
Microwave signal processes for user through power amplifier etc..
2) format modulation signal translative mode
B1, the electrode voltage adjusted on adjustable light wave-filter, change passband width, and every road adjustable light wave-filter is only filtered
Go out single sideband singal and the centered carrier of single order；Such as adjusting upper path filter makes it can only be carried by single order upper side band and center
Ripple, lower path filter passes through single order lower sideband and centered carrier.So sideband is after the photoswitch of orderly break-make, in time domain
Upper rank sideband and lower rank sideband signals waveform are no longer continuous print.
B2, when the NRZ sequence that the control sequence being carried on MZI photoswitch is OOK signal modulation sequence, it is stipulated that control
When sequence is 0 or 1, upper and lower two MZI photoswitches have a-road-through road；
The two paths of signals of B3, every road adjustable light wave-filter output is multiplexed together, and produces the microwave of BPSK modulation format
Signal.After two paths of signals is multiplexed together, the signal according to NRZ sequential successively assembled arrangement can be regarded as, time domain has become
Whole signal.Owing between the double-sideband signal lower sideband signal after MZM modulates, phase is π, so after multiplexing
Optical signal time upper and lower two paths of signals alternate combinations occurs, arise that π phase contrast, namely OOK signal modulation sequence occurs 0
When replacing with 1, there is phase contrast π in multiplexed signals, and modulated signal is equivalent to the modulation format of BPSK.Signal is through optical fiber multiplexing
Transmission, carries out optical heterodyne reception at remote antenna unit, just creates the microwave signal of BPSK modulation format.
Preferably, the step of remote antenna unit feedback areas channel usage, central office root are also included after step A3
Adjust, according to the message of remote antenna unit feedback, the driving voltage being carried on adjustable light wave-filter, control filter center ripple
Length and passband width, filter the sideband signals of different orders, at remote antenna unit after the transmission of optical sideband signal multiplexing
Carry out optical heterodyne reception, form the frequency multiplication of multi-frequency.This step achieves the structure of dynamic multi-frequency section RoF network, it is achieved that
The switching at runtime of multiple rf frequency in RoF system.
About central office: in RoF system, remote antenna unit (base station) only comprises these simple merits 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, low cost.Central station is shared
Ability is strong, it is simple to centralized management is safeguarded, scheduling of resource.
Preferably, under format modulation signal translative mode, when the control sequence being carried on MZI photoswitch is that NRZ becomes
During the differential coding sequence got in return, produce the microwave signal of DPSK modulation format.Digital modulation principle is analyzed, volume of checking the mark
Code modulation sequence be the relocatable code converted by OOK modulation sequence, be still ' 0 ' with ' 1 ' sequence.So, analogy BPSK adjusts
The method of form processed conversion, as long as the sequence being carried on on-off keying adjustable light wave-filter is differential coding sequence, with regard to energy
Realize signal to change from OOK modulation format to DPSK modulation format.
The invention have the benefit that
1, restructural RoF system based on on-off keying adjustable light wave-filter of the present invention, uses straight tune to add investigation mission outside the city or town
Mode produce light and carry millimeter wave modulating；In light carries the up-conversion scheme of millimeter wave, the mode that straight tune adds investigation mission outside the city or town avoids
Utilize two MZM realize up-conversion or utilize in optical fiber or semiconductor device non-linear realize up-conversion, realizing frequency multiplication effect
Reduce cost while Guo, reduce complexity, raising stability；
2, the radio frequency carrier frequency of restructural RoF system based on on-off keying adjustable light wave-filter of the present invention
Restructural pattern, carries out linear filter by two-way filter to double-sideband signal, during the two paths of signals leached can be respectively
Any two in heart carrier wave, single order lower sideband, second order lower sideband；So two-way optical sideband signal is through multiplexing transmission
After, carry out optical heterodyne reception at remote antenna unit, multiple times of yupin effect can be produced；This radio frequency switching in RoF system
Technology can realize the structure of RoF reconfigurable network, completes radiofrequency signal multi-frequency switching at runtime in RoF system；
3, the format modulation signal of restructural RoF system based on on-off keying adjustable light wave-filter of the present invention turns
Die change formula, solves straight tune and adds the shortcoming that investigation mission outside the city or town RoF system can only produce OOK signal；According to upper side band signal and take a message below
Number phase is the principle of π, utilizes on-off keying adjustable light wave-filter, by NRZ sequence leach successively upper side band or under
Sideband, carries out optical heterodyne reception at remote antenna unit after multiplexing transmission, and radiofrequency signal is bpsk signal；By by NRZ sequence
The differential coding sequence that conversion comes leaches upper side band or lower sideband, successively after multiplexing transmission outside remote antenna unit carries out light
Poor reception, radiofrequency signal is dpsk signal；It is wirelessly transferred middle phase-modulation and there is the feature of constant amplitude, in antinoise with anti-
Non-linear ability aspect has advantage, and therefore BPSK modulation and DPSK modulation are modulated advantageously relative to OOK；
4, restructural RoF system based on on-off keying adjustable light wave-filter of the present invention, utilizes AWG tunable optical
Sideband signals integrated is filtered by wave filter and MZI photoswitch, dynamic break-make etc. processes, it is achieved the radiofrequency signal of whole system
The dynamic adjustable function of multi-frequency switching at runtime, format modulation signal conversion；Under the coordination of center control instruction, completely may be used
To realize multiband, the switching at runtime of dual signal modulation format, become the multiple services transmission network of carrying；
5, restructural RoF system based on on-off keying adjustable light wave-filter of the present invention, uses AWG tunable optical
Wave filter, this wave filter has centre wavelength, the advantage that passband width is the most adjustable and passband width is narrow, so leaching limit
During band signal, useful signal is relatively cleaner, will not produce big noise and redundant signals in transmitting procedure, improve letter
Number transmission quality.
Accompanying drawing explanation
Fig. 1 is the structural representation of restructural RoF system based on on-off keying adjustable light wave-filter of the present invention；
Fig. 2 is the structural representation of on-off keying adjustable light wave-filter of the present invention；
Fig. 3 is the waveform schematic diagram that OOK signal is converted to bpsk signal and dpsk signal；
Fig. 4 is the structural representation of MZM of the present invention.
Detailed description of the invention
Below in conjunction with embodiment and Figure of description, the present invention will be further described, but is not limited to this.
Embodiment 1
As shown in Figure 1-2.
A kind of restructural RoF system based on on-off keying adjustable light wave-filter, directly adjusts laser including be sequentially connected with
Device, electrooptic modulator and tuned cell；Electrooptic modulator connects 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 includes adjustable light wave-filter and the MZI light being arranged in series
Switch.
Embodiment 2
Restructural RoF system based on on-off keying adjustable light wave-filter as described in Example 1, its difference is,
The outfan of tuned cell connects remote antenna unit.
Embodiment 3
Restructural RoF system based on on-off keying adjustable light wave-filter as described in Example 1, its difference is,
The outfan of electrooptic modulator is connected with the input of tuned cell by erbium-doped fiber amplifier (i.e. EDFA in Fig. 1).
Embodiment 4
As shown in Figure 4.
Restructural RoF system based on on-off keying adjustable light wave-filter as described in Example 1, its difference is,
Described electrooptic modulator is MZM；Adjustable light wave-filter is AWG adjustable light wave-filter.AWG tunable optic filter is a kind of base
In the adjustable light wave-filter of Lithium metaniobate, 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 electrode, and the lower surface of lower limit layer is provided with bottom electrode.Described Lithium metaniobate ripple
Conducting shell is the LiNbO_3 film that upper surface is provided with array waveguide grating；Described upper electrode includes the even number waveguide electricity being mutually inserted
Pole and odd wave conductive electrode；When odd even WAVEGUIDE LOADED in-phase voltage, it is achieved centre wavelength is adjustable；When WAVEGUIDE LOADED has reverse electricity
Passband width is realized adjustable during pole tension.MZI photoswitch controls the phase contrast of two-arm by loading electrode voltage so that two-way light
Emergent power extreme value after interference, it is achieved switch on and off.
Embodiment 5
As described in embodiment 1-4, the method for work of restructural RoF system, as follows including step, and speed is 2.5Gbit/s's
OOK 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
The sine wave signal of 15GHz is loaded on MZM, adjusts phase place and the direct current being carried in sine wave signal in the upper and lower two-arm of MZM
Bias voltage, the phase contrast of the radiofrequency signal being carried in the upper and lower two-arm of MZM is π, and DC offset voltage is Vπ(the V of // 2πIt is MZM
Half-wave voltage), MZM exports double sideband modulation signal DSB；Double sideband modulation signal DSB enters tuned cell；Two-way can up and down
Tuning filtering device leaches arbitrary order sideband respectively；Controlled loading electrode voltage on MZI photoswitch, MZI photoswitch dynamically has
Sequence break-make, sideband signals synchronous transfer that two-way adjustable light wave-filter leaches or time multiplexed transmission.
Embodiment 6
The method of work of restructural RoF system as described in Example 5, its difference is, double sideband modulation signal DSB warp
After crossing erbium-doped fiber amplifier amplification, enter tuned cell.
Embodiment 7
One utilizes restructural RoF system described in embodiment 1-4 to carry out the reconstruct of radio-frequency carrier multi-frequency and signal is modulated
The method of form conversion, comprises the following steps that
1) the restructural pattern of radio frequency carrier frequency
A1, the electrode voltage controlled on two MZI photoswitches by the control sequence that is carried on MZI photoswitch make MZI
Photoswitch all-pass；
Baseband signal is loaded into directly modulated lasers, and laser output signal is set to AE0ejωt.Light carries millimeter
Ripple signal enters MZM and is modulated, and MZM upper and lower two-arm loading amplitude is identical, frequency is Ω, and initial phase differs
Sinusoidal local oscillation signal V for 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, simultaneously 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], wherein signal packet is in ω containing angular frequency
Heart carrier wave, angular frequency be the single order lower sideband of ω ± Ω, angular frequency be ω ± 2 Ω second order lower sideband, other high-order sidebands
Ignore；
A2, adjustment are carried in the driving voltage on two-way adjustable light wave-filter, are filtered device centre wavelength and passband
Width tunes, and leaches single order single-side belt, second order single-side belt or centered carrier；
A3, carry after the signal multiplexing of any two sideband through fiber-optic transfer, carry out optical heterodyne at far-end receiving terminal
Receive the multiple frequency multiplication 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 frequency tripling effect with second order lower sideband beat frequency or single order lower sideband with second order upper side band beat frequency
Really, 45GHz microwave signal is produced；Second order upper side band and second order lower sideband beat frequency realize quadruple effect, produce 60GHz microwave letter
Number.
Microwave signal processes for user through power amplifier etc..
2) format modulation signal translative mode
B1, the electrode voltage adjusted on adjustable light wave-filter, change passband width, and every road adjustable light wave-filter is only filtered
Go out single sideband singal and the centered carrier of single order；
B2, when the NRZ sequence that the control sequence being carried on MZI photoswitch is OOK signal modulation sequence, it is stipulated that control
When sequence is 0 or 1, upper and lower two MZI photoswitches have a-road-through road；When controlling sequence and occurring 0, upper road MZI photoswitch path,
The MZI photoswitch open circuit of lower road；When controlling sequence and occurring 1, the MZI photoswitch open circuit of upper road, lower road MZI photoswitch path.Time
In sequence, when controlling sequence and occurring 0, single order upper side band and centered carrier are filtered off, the single order lower sideband when controlling sequence and occurring 1
It is filtered off with centered carrier.
The two paths of signals of B3, every road adjustable light wave-filter output is multiplexed together, according to the rank sideband up and down of NRZ sequence
In the time domain of signal alternately arranged；Can be obtained by Bezier expansion, the phase contrast of the lower sideband of double sideband modulation signal is π,
Rank signal alternately occurs as soon as π phase contrast up and down, can regard bpsk signal as, the signal obtained after remote antenna unit receives
For 2A2J0(β)J1(β)cos(ωmAnd 2A t)2J0(β)J1(β)cos(ωmT+ π), after modulation, radiofrequency signal is equivalent to 15GHz's
The signal of BPSK modulation format.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.Owing between the double-sideband signal lower sideband signal after MZM modulates, phase is
π, during so upper and lower two paths of signals alternate combinations occurs in the optical signal after multiplexing, arises that π phase contrast, namely OOK signal
When modulation sequence appearance 0 and 1 replaces, there is phase contrast π in multiplexed signals, and modulated signal is equivalent to the modulation format of BPSK.Letter
Number through optical fiber multiplexing transmit, carry out optical heterodyne reception at remote antenna unit, just create BPSK modulation format microwave letter
Number.
Embodiment 8
The method that restructural RoF system carries out radio-frequency carrier multi-frequency reconstruct as described in Example 7, its difference is,
Also including the step of remote antenna unit feedback areas channel usage after step A3, central office is anti-according to remote antenna unit
The message of feedback adjusts the driving voltage being carried on adjustable light wave-filter, controls filter center wavelength and passband width, right
The sideband signals of different orders filters, and carries out optical heterodyne reception at remote antenna unit after the transmission of optical sideband signal multiplexing,
Form the frequency multiplication of multi-frequency.This step achieves the structure of dynamic multi-frequency section RoF network, it is achieved that multiple in RoF system penetrate
Again and again the switching at runtime of rate.
Embodiment 9
The method that restructural RoF system carries out format modulation signal conversion as described in Example 7, its difference is, at letter
Under number modulation format translative mode, when the control sequence being carried on MZI photoswitch is that NRZ converts the differential coding sequence obtained
Time, produce the microwave signal of DPSK modulation format.Analyzing in digital modulation principle, coded modulation of checking the mark sequence is to be adjusted by OOK
Sequence transformation processed and the relocatable code that comes, be still ' 0 ' and ' 1 ' sequence.So, the method for analogy BPSK modulation format conversion, only
Sequence on on-off keying adjustable light wave-filter to be carried in is differential coding sequence, can be achieved with signal and modulates lattice from OOK
Formula is changed to DPSK modulation format.It is illustrated in figure 3 the signal of OOK modulation format to BPSK modulation format and DPSK modulation format
Transition diagram.
Claims (10)
1. a restructural R o F system based on on-off keying adjustable light wave-filter, it is characterised in that include being sequentially connected with
Directly modulated lasers, electrooptic modulator and tuned cell；Electrooptic modulator connects local vibration source；Tuned cell includes that two-way is in parallel
The on-off keying adjustable light wave-filter arranged, on-off keying adjustable light wave-filter includes the tunable optical filtering being arranged in series
Device and MZI photoswitch.
Restructural R o F system based on on-off keying adjustable light wave-filter the most according to claim 1, its feature exists
In, the outfan of tuned cell connects remote antenna unit.
Restructural R o F system based on on-off keying adjustable light wave-filter the most according to claim 1, its feature exists
In, the outfan of electrooptic modulator is connected with the input of tuned cell by erbium-doped fiber amplifier.
Restructural R o F system based on on-off keying adjustable light wave-filter the most according to claim 1, its feature exists
In, described electrooptic modulator is MZM；Adjustable light wave-filter is AWG adjustable light wave-filter.
5. the method for work of restructural R o F system described in a claim 1-4 any one, it is characterised in that include step
Rapid as follows, baseband signal is modulated on light carrier by directly modulated lasers, and the light carrier of directly modulated lasers output enters MZM, this
Vibration source produce sine wave signal be loaded on MZM, adjust be carried in sine wave signal in the upper and lower two-arm of MZM phase place and
DC offset voltage, MZM exports double sideband modulation signal DSB；Double sideband modulation signal DSB enters tuned cell；Two-way up and down
Tunable optic filter leaches arbitrary order sideband respectively；Controlled loading electrode voltage on MZI photoswitch, MZI photoswitch is dynamic
In order break-make, sideband signals synchronous transfer that two-way adjustable light wave-filter leaches or time multiplexed transmission.
The method of work of restructural R o F system the most according to claim 5, it is characterised in that double sideband modulation signal DSB
After erbium-doped fiber amplifier amplifies, enter tuned cell.
The method of work of restructural R o F system the most according to claim 5, it is characterised in that described baseband signal is lucky
The baseband signal of bit magnitude.
8. one kind utilizes restructural R o F system described in claim 1-4 any one to carry out radio-frequency carrier multi-frequency reconstruct
Method with format modulation signal conversion, it is characterised in that comprise the following steps that
1) the restructural pattern of radio frequency carrier frequency
A1, the electrode voltage controlled on two MZI photoswitches by the control sequence that is carried on MZI photoswitch make MZI light open
Close all-pass；
A2, adjustment are carried in the driving voltage on two-way adjustable light wave-filter, are filtered device centre wavelength and passband width
Tuning, leaches single order single-side belt, second order single-side belt or centered carrier；
A3, carry after the signal multiplexing of any two sideband through fiber-optic transfer, carry out optical heterodyne reception at far-end receiving terminal
Realize the multiple frequency multiplication of signal；
2) format modulation signal translative mode
B1, the electrode voltage adjusted on adjustable light wave-filter, change passband width, and every road adjustable light wave-filter only leaches one
The single sideband singal on rank and centered carrier；
B2, when the NRZ sequence that the control sequence being carried on MZI photoswitch is OOK signal modulation sequence, it is stipulated that control sequence
When being 0 or 1, upper and lower two MZI photoswitches have a-road-through road；
The two paths of signals of B3, every road adjustable light wave-filter output is multiplexed together, and produces the microwave signal of BPSK modulation format.
The method that restructural R o F system the most according to claim 8 carries out radio-frequency carrier multi-frequency reconstruct, its feature
Being, also including the step of remote antenna unit feedback areas channel usage after step A3, central office is according to remote antenna
The message of unit feedback adjusts the driving voltage being carried on adjustable light wave-filter, controls filter center wavelength and passband width
Degree, filters the sideband signals of different orders, carries out optical heterodyne at remote antenna unit after the transmission of optical sideband signal multiplexing
Receive, form the frequency multiplication of multi-frequency.
The method that restructural R o F system the most according to claim 8 carries out format modulation signal conversion, its feature exists
In, under format modulation signal translative mode, when the control sequence being carried on MZI photoswitch is that NRZ converts the difference obtained
During coded sequence, produce the microwave signal of DPSK modulation format.
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