CN107408984A - Utilize the firing frequency frequency analog fiber link of optical signal prosessing - Google Patents
Utilize the firing frequency frequency analog fiber link of optical signal prosessing Download PDFInfo
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- CN107408984A CN107408984A CN201580073152.7A CN201580073152A CN107408984A CN 107408984 A CN107408984 A CN 107408984A CN 201580073152 A CN201580073152 A CN 201580073152A CN 107408984 A CN107408984 A CN 107408984A
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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
- H04B10/25752—Optical arrangements for wireless networks
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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
- H04B10/25752—Optical arrangements for wireless networks
- H04B10/25758—Optical arrangements for wireless networks between a central unit and a single remote unit by means of an optical fibre
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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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/67—Optical arrangements in the receiver
- H04B10/671—Optical arrangements in the receiver for controlling the input optical signal
- H04B10/675—Optical arrangements in the receiver for controlling the input optical signal for controlling the optical bandwidth of the input signal, e.g. spectral filtering
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
Wideband phase modulator is used together with high power laser light carrier wave, and higher frequency RF signals are converted into the optical signal that phase modulated.The higher laser power of input modulator produces bigger RF signal frequency side bands.Carrier wave that carrier attenuation filter passes are attenuated and the RF modulation sideband,s not being attenuated.Carrier attenuation causes bigger RF signal frequency side bands.Demodulator filter and photodetector or balance photodetector are to being used together, optical signal converted back into electric signals that phase is modulated.Only attenuated carrier allows to use superpower laser, avoids photodetector damage or saturation, and provide the RF link gains of increase, low noise acoustic noise (NF) and high SFDR.The carrier wave optical power feedback being filtered out is returned into lasing light emitter to improve overall system efficiency.Additional optical filtering wave by prolonging time device with dual output is used together with polarization multiplexer or optics coherence tomography coupler, and signal power is synthesized into single photodetector, so as to further increase the conversion efficiency of electro-optical signal.
Description
Background technology
Both it had been used to military, aerospace applications using the present day analog fiber link of intensity modulator be also used for commercially should
With for transmitting analog radio frequency (radio frequency, RF) signal from antenna.Current fiber link has limited
Performance, especially in high RF frequency (10 to ＞ 100GHz) section, this is due to that the limitation of the modulator at higher RF frequency is led
The conversion efficiency of the decline of cause, and before the damage of non-linear saturation occurs, zonule high-frequency photodetector has
The optical power handling capability of limit.These limitations as caused by modulator and photodetector are seriously limited for these high RF
The performance and operational feasibility of traditional RF fiber links of frequency signal transmission.
The present invention be EOSapce companies 2010 year 2 month submit within 9th by same inventor Suwat Thaniyavarn send out
The extension of the patent of bright U.S. Patent number 7,660,491.
Current simulation RF fiber links presence for higher RF frequency signal needs to solve the problems, such as.Because height damages
Consumption, weight and finite bandwidth, believe currently without for transmitting the RF with extremely high frequency (10 to ＞ 100GHz) from antenna
Number feasible RF coaxial cables or waveguide transmissions link.Conversely, these higher frequency RF signals are processed or dropped near antenna
Frequently, fidelity is caused greatly to reduce the finite bandwidth with channelization technique.
Simulation RF fiber links are massive band width, conveying length is independently lost and broadband RF photonic signal processing is provided and dived
Possible.However, it is necessary to improve current fiber link energetically, in particular for the property of the fiber link of high millimeter-wave frequency
Energy.(it is used to RF electric signals being converted into for carrying out signal transmission by optical fiber although these problems are due to optical modulator
Optical signal) and photodetector (photodetector) (be used for the optical signal transmitted by optical fiber is converted back in receiver end
RF signals) it can be worked at high RF frequency, but they are less efficient at higher RF frequency.Furthermore it is possible in high RF
The photodetector size to be worked at frequency is very small, and this is necessary for the work at upper frequency, therefore, is merely able to
Carry out limited luminous power processing.The limited luminous power process problem of high frequency photodetector means to use higher
Optical power source.Luminous power is limited on photodetector to be meaned in low link load, strong noise index and relatively low dynamic
Limited RF fiber link performances in terms of state scope.These problems are limited currently at high RF (20- ＞ 100GHz) frequency
Implement the optical fiber transmission of RF signals.
The content of the invention
The present invention provides improved simulation RF fiber links and realized.
The present invention describes the technology for obtaining high RF frequency fiber link, has simultaneously and surprising performance improvement, including
RF gains, low noise figure (noise figure, NF) and high SFDR (spurious free dynamic
Range, SFDR), solve the limitation of the optical assembly described in background technology.
This fiber link implementation described in the present invention can greatly change current high-frequency RF signal distributions system
Unite framework in itself, without in aerial position to RF signal downs.
The present invention provides feasible solution for the high-performance optical fiber transmission of higher frequency RF signals first.
Realizing the basic equipment of these RF fiber links includes：Lasing light emitter, optical modulator, photodetector and light filtering
Device combines.
With low relative intensity noise (RIN), high power, high correlation, narrow line-width continuous-laser (cw-laser)
As optical power source.Photodetector should be able to carry out high RF frequency operation.Wideband optical modulator be phase-modulator (such as
Based on broadband electrical-optical traveling wave LiNbO3The phase-modulator of waveguide modulator).
The luminous power for carrying out self-excitation light source is transmitted to modulator.Electric (high-frequency RF) signal is fed to phase-modulator and turned
The optical signal that phase is modulated is changed to, and photodetector is transferred to by one group of optical filter via optical fiber.
This group of optical filter includes the combination of optical filter, and its transfer function can be redeployed as, in photodetection
By before optical signal converted back into electric signals in device, specific optical signal prosessing function is performed to the optical signal of modulation.
One of optical filter is achieved in that reconfigurable optical delay line interference mode filter.
The key of the present invention is to combine these reconfigurable optical filters, the letter modulated for orrection phase place
Number light frequency distribution, while broadband RF link gain, noise figure and SFDR is significantly increased.Basic filter system (figure
1) there are two reconfigurable optical filters of series connection.First wave filter (A) is reconfigured for a fixed number of mainly only decaying
The carrier wave luminous power of amount, and modulation sideband signals are influenceed minimum.
When optical signal by only decay-carrier wave process to reduce DC power after, the second dual output optical delay line wave filter (figure
Wave filter B in 1) be used for " demodulation " only-signal modulated of the phase that is attenuated of carrier wave, be converted in photodetector
Return the RF signals that intensity is modulated.
By using higher optical power source, bigger overall link gain can be obtained.However, do not make small area,
In the case of the damage of high-frequency photodetector or saturation, higher power source is typically what can not be used.This optics " only-
Carrier wave " decay technique is by " DC " power component of only decaying, i.e., by carrier attenuation to the level to photodetector safety, to permit
Perhaps the lasing light emitter of higher-wattage is used, without making photodetector saturation/damage.Due to typical small RF modulation depths, light
The luminous power of electric explorer is dominated by carrier signal, therefore, it is possible to which cause photodetector saturation or damage is carrier power.
By using higher power source, the sideband of modulated signal is also higher, but will not be attenuated, so as to be produced in photodetector
Raw bigger link gain.
For example, using higher power source, optical power levels are increased into+10dB, carrier wave and modulation sideband, signal will all increase
+ 10dB greatly.Once the wave filter for " the only decay-carrier wave " that the optical signal is passed through into -10dB, photodetector will be seen that with before
Using lower-wattage lasing light emitter when identical light carrier.However, the power level increase for the modulation sideband, signal do not decayed
10dB.This causes whole link gain increase 10dB.This lasing light emitter and the only filter of decay-carrier wave using higher-power
The link gain that the new fiber link of ripple device has, limited using relatively low laser power and using having luminous power to handle
10 times of traditional fiber link of identical photodetector because to both of these case, received on photodetector
Luminous power keep identical substantially.Modulation voltage efficiency is effectively brought up to 10 by this equivalent to using relatively low optical power source
Square root times.
This is U.S. Patent No. 7,660,491, same inventor Suwat Thaniyavarn, the artificial EOSpace of application
Inc. in the extension of 2 months patents submitted on the 9th in 2010.
Compared to the patent of U.S. Patent No. 7,660,491 before, invention disclosed herein is by using optical signal
Handle concept and there is suitable transmission function (transfer functions) and optical time delay line (optical delay-
Lines optical filter combination), so as to provide more advanced implementation and improvement.By solving main basic problem
(which limit the performance for the analog fiber optic link for transmitting these high RF frequency signals), new simulation RF fiber link implementations
High RF (10 to the ＞ 100GHz) frequency signal of transmission is particularly useful and most suitable, had compared with conventional method higher
Performance level.
The very high RF frequency of traditional fiber link pair is invalid that this is due to that two main optical assemblies have base at present
This problem, i.e., the modulation efficiency of optical modulator is relatively low at these upper frequencies, and photodetector has smaller activity
Optical power handling capability is relatively low under detector region, therefore, it is necessary to obtains big bandwidth for higher frequencies of operation.
The present invention describes solves these basic optical assembly restricted problems using optical filter and optical signal prosessing concept
Technology, so as to generate for transmit these high RF frequency signals, there is the horizontal analog fiber optic link of very high performance,
Including：Obtain high link gain, low noise figure and high SFDR simultaneously.
Multistage optical filter of the present invention using optical modulator and with high power laser source.Light filter for these applications
The simplest form of ripple device can utilize optical delay line mode filter, can utilize low-loss optically wave filter and/or transparent material
Optic waveguide circuit on material (such as silica, polymer or electrical-optical material, such as lithium niobate substrate) makes these filtering
Device.The adjustable optical waveguide components of voltage on electrical-optical substrate are combined, it is allowed to neatly obtain voltage is adjustable can be again
The optical filter of configuration, which enhance the flexibility of the present invention.Intensity modulator and phase-modulator are all applicable.However,
For these implementations, phase-modulator is preferable modulator type.
Analog optical fiber has linked phase-modulator, superpower laser, high frequency photodetector and optical filter combination.The
One filter configuration is carries out only carrier attenuation (not influenceing modulation sideband) in optical frequency domain on the optical spectrum of phase-modulator, tightly
It is used for signal that be attenuated carrier wave at photodetector, that phase is modulated with optical filter thereafter and is demodulated to intensity quilt
The signal of modulation.
Installed in low-loss electrical-optical substrate (such as LiNbO3) on reconfigurable twin-stage, optical time delay line filtering
Device performs filter function.
The basic fiber link of proposition is schematically shown in Fig. 1, it utilizes high power laser source and only-carrier light filtering
Device, phase-modulator, photodetector and another optical filter for demodulation phase.In the basic link, filter out simultaneously
Abandon the luminous power from laser.
Another implementation that Fig. 6 and Fig. 7 is schematically shown re-uses the luminous power being filtered out.Filtered with wasting
The light carrier power removed is different, and the carrier power being filtered out is fed back into laser, is formed in it and is configured with laser diode, phase
The new laser cavity of modulator and optical filter.This new implementation eliminates the waste to luminous power, adds entirety " wall
Insert " saving of (wall-plug) power consumption and the efficiency of system.
Another implementation is schematically shown in Fig. 8, by using attached with appropriate length and polarization multiplexer
Add optical delay line, two complementary signals from two outputs are merged into a photodetector, so as to suitable in arrowband
Higher RF signal gains are obtained in frequency range.By dual output wave filter, complementary output can be provided.Typically for biography
For the optical signal that defeated RF is modulated, preferably single optical fiber and single photodetector rather than double optical fiber and balance detection
Device pair.As shown in figure 8, by increasing suitable time delay and the rotation of the optical signal to being delayed by an output properly
Polarization, can be by two with cross-polarization optical signal and polarization multiplexer from two output ports
(polarization multiplexer) is combined, and is sent to photodetector.The two polarised lights in photodetector
Signal is transformed independently into RF signals.Set suitable difference to be delayed, such as set for RF signal of the center in 50GHz
10ps difference delay, so that complementation (out of phase) RF signals before two ports are existing in photodetector
In same-phase, the RF outputs of photodetector are doubled substantially.The implementation to enhancing RF link gains be it is useful,
It utilizes single optical fiber and single photodetector, makes the RF phases of two signals at photodetector in the range of narrow bandwidth
It is synchronous.
Fig. 9 schematically shows another alternative implementation, prolongs by using the additional optical with appropriate length
When line and coherent combiner, will be synthesized to from the complementary signals of two outputs in a photodetector, so as to suitable for narrow
With obtaining higher RF signal gains in frequency range.Adjusted using suitable time delay and light phase, by two optical signals
(light phase and RF phases) is coherently synthesized into a photodetector.
Identical implementation can be obtained using the link based on double complementary output intensity modulators, it is additional so as to utilize
Optical delay line and optical multiplexer (coherent combiner shown in polarization multiplexer and Figure 11 as shown in 10) obtained in narrow-band
Get Geng Gao RF signal gains.
Using superpower laser carrier wave, higher frequency RF signals are converted into the light that phase modulated and believed by wideband phase modulator
Number.Higher luminous power from laser to modulator produces bigger RF signal frequency side bands from given RF inputs.Carrier attenuation is filtered
The carrier wave and unbated RF modulation sideband,s that ripple device attenuated carrier and transmission are attenuated.Attenuated carrier causes bigger RF signals
Sideband.Demodulator filter and photodetector or balance photodetector are to being used together, optical signal that phase is modulated
Converted back into electric signals.Only attenuated carrier allows to use superpower laser, avoids photodetector damage or saturation, and provide
Increased RF link gains, low noise figure (NF) and high SFDR (SFDR).The carrier wave work(that will can be filtered out
Rate feeds back to laser to increase overall system efficiency.It is with dual output, make together with polarization multiplexer or coherent combiner
Signal power is synthesized to single photodetector by additional optical filtering wave by prolonging time device, further to improve turning for electro-optical signal
Change efficiency.
These and other target of the invention and feature are it will be evident that the disclosure is said including what is just write above in the disclosure
Bright book and claims and drawing.
Brief description of the drawings
Fig. 1, which is shown, transmits laser carrier frequency to the system of remote site, and positioned at the unbiased at antenna remote end
Put phase-modulator and utilize the RF signal modulation laser carrier frequencies from antenna, and pass through carrier attenuation wave filter and demodulation
The signal modulated is returned to photodetector by wave filter.
Fig. 2 schematically depicts the groundwork of the fiber link of the optical spectrum with different phase.
Fig. 3 shows the link gain of calculating, low noise figure (NF) and high SFDR (SDFR).
Fig. 4 shows the link that several groups of parallel wave filters and receiver are used for wider bandwidth range.
Fig. 5 shown on electrical-optical substrate, such as LiNbO3, height for high RF frequency (10- ＞ 100GHz)
The reconfigurable optical filter of speed.
Fig. 6 is schematically shown using dual output optical delay line wave filter, and the carrier power filtered out is with new laser cavity
Form is fed back to laser.
Fig. 7 schematically shows the example (such as grating) using narrow line reflection type optical filter, wherein unwanted
Remaining light carrier power is fed back to laser, forms new laser cavity.
Fig. 8 schematically shows the example with additional optical delay line and polarization multiplexer, and it utilizes single output optical fibre
With the link gain of phase-modulator of the single photodetector increase with double complementary output wave filters.
Fig. 9 schematically shows the example with additional optical delay line and coherent combiner, and it utilizes single output optical fibre
With the link gain of phase-modulator of the single photodetector increase with double complementary output wave filters.
Figure 10 schematically shows the example with additional optical delay line and optical multiplexer, its using single output optical fibre and
The link of single Mach-Zehnder (Mach-Zehnder) intensity modulator of photodetector increase with 1 × 2 dual output increases
Benefit.
Figure 11 schematically shows the example with additional optical delay line and coherent combiner, and it utilizes single output optical fibre
With the link gain of Mach-Zehnder intensity modulator of the single photodetector increase with 1 × 2 dual output.
Embodiment
As shown in figure 1, primary filter system 1 has the reconfigurable optical filter 2 of two series connection.First filtering
Device A is reconfigured for the luminous power of the main only attenuated carrier of certain amount, and modulation sideband signals are influenceed to minimize.The
The optical frequency transmission spectrum (optical frequency transmission spectrum) of one wave filter is arranged in light frequency
It is symmetrical on light carrier in domain.For the signal that minimal attenuation is being modulated, the cycle of delay line filter should be set as most
Bigization transmits modulation sideband, frequency.Generally, many other optical filters can be used for the task, including arrowband Fabry-Perot
Sieve (Fabry-Perot), fiber grating etc., its only attenuated carrier signal power.
Second wave filter B is used for the signal that demodulation phase is modulated, and presents the result to balance photodetector 3.
High power laser source 4 is provided laser carrier power to remote location by the first optical fiber in optical fiber 5, the unbiased on the position
Poor phase-modulator 7 carries out phase-modulation using the RF signals from antenna 8 to the laser carrier.The signal of modulation passes through second
Optical fiber returns to carrier attenuation wave filter A.Result is that link gain has low noise figure and high SFDR.
Fig. 2 diagrammatically illustrates the basic operation of fiber link, has the optical spectrum of different phase.
The technology of attenuated carrier is also without the link modulated for phase before.It is attenuated to realize using carrier wave
, the link that phase is modulated, it is necessary to including add optical filter.
After the processing that optical signal has been attenuated by only carrier wave is to reduce DC power, photodetector would not be made
Saturation or damage, the signal that the phase that only carrier wave is attenuated modulated is demodulated using the second dual output optical delay line wave filter,
The RF signals that intensity is modulated are converted it back at photodetector.
Fig. 2 has schematically painted the overall basic operation of the link, including main optical spectrum.The relative magnitude of frequency with
Log scales are shown.
In the output end of high power laser source 10, optical spectrum illustrate only single light carrier frequency spectrum Ω 14.
When optical signal is by being applied with the L of RF signals 11iNbO3After phase-modulator 12, light that phase is modulated
The optical spectrum 13 of signal shows carrier signal 14 and RF- modulation sideband,s 15.Generally, compared with carrier power level, modulation
Sideband power level is small.This is to keep the linearity of modulator, is also due to poor modulation efficiency at high RF frequency.
Then, the reconfigurable wave filter that the optical signal 13 that the phase is modulated passes through first " only decay-carrier wave "
22, its transmission spectrum (frequency transmission spectrum) 21 be configured to it is symmetrical on carrier frequency, as scheme institute
Illustrate, it provides RF modulation sideband,s signal 15 with certain amount (for example, in the range of 10-20dB) attenuated carrier 14
Full transmission.Main, only carrier frequency 14 is filtered out.Therefore, the not too large modulation sideband, influenceed in signal 23 is kept.
The horizontal quantity of only decay-carrier wave should be set, so as to finally in the end of link by photodetector 26
The overall optical power received is limited in less than damage, saturation or reduces the linearity of photodetector and the level of performance.
Optical spectrum 23 only after the wave filter of decay-carrier wave is shown as having smaller carrier signal 14.Therefore, with profit
Compared with the lasing light emitter without the only lower-wattage of the wave filter of decay-carrier wave, the ratio of modulation sideband, 15 and carrier wave increases.
The optical signal 23 that the carrier wave is attenuated is sent to the second optical filter 24, and its transmission spectrum is set as on the load
Wave frequency rate is symmetrical, at photodetector 26 by light phase modulation signal 25 be transformed into it is single or balance photodetector pair it is strong
Spend modulated signal.
U.S. Patent No. 7,660,491, entitled " utilize the HDR simulation of phase-modulation and tunable fiber
Fiber link (HIGH-DYNAMIC-RANGE ANALOG FIBER-OPTIC LINK USING PHASE MODULATION
AND TUNABLE OPTICAL FILTER) ", inventor Suwat Thaniyavarn, the artificial EOSPACE Inc. of application in
On 2 9th, 2010 patents submitted, it is incorporated by herein by quoting herein.
Using the optical delay line wave filter 24 with double complementary outputs 25, two output signals can be sent to balance light
Electric explorer is to 26, for eliminating RIN noises and increase signal gain.
Fig. 3 shows while realizes broadband RF link gain, low noise figure (NF) and enhancing without spuious dynamic model
Enclose (SFDR).
Signal gain 30 is calculated as to the RF link gains of such analog fiber optic link.
As an example, the calculating RF link gains of this new fiber link of following discussion, noise figure (NF) 31 and
SFDR (SFDR) 32, it makes use of phase-modulator 12, the only lasing light emitter 10 of more power, decay-carrier wave
Filter bank 22 and the wave filter of phase-demodulation 26.
Fig. 3 shows appropriate levels of current in photodetector 26 (10mA), 5V-V π modulators, has -160dB/
The lasing light emitter 33 and balance photodetector (RIN- noise suppresseds) of Hz RIN noises, it is high RF frequency (from dc-
Function 160GHz).
Compared with current traditional MZM26 (being based on Mach-Zehnder intensity modulated) fiber link, in high RF frequency 37
On, the phase modulating method for the carrier wave of combination-be filtered out allows RF link gains improving~20-30dB like never before, such as
34th, shown in 35.
Even if with these appropriate device parameters and simple delay line filter, can also be realized at band center~
The low NF and~120-125dB/Hz of 6-15dB link gain ,~5-10dB2/3SFDR.With 10- ＞ ＞ 20dB carrier waves
Wave filter calculates F/O links filtered, that phase is modulated directly with traditional MZM intensity modulateds link with RF frequency
Function ratio compared with.
Fig. 4 shows the link using several groups of parallel wave filters and receiver, is covered for broader bandwidth range.
Fiber link that the carrier wave proposed is filtered out, that phase is modulated is broadband (multistage) link, mutual without second order
Adjust distortion.By the cycle for simply changing delay line filter, it is possible to which the optical technology is extended into any RF frequency.RF
Frequency is higher, and reconfigurable optical filter assembly is lower with regard to smaller and loss.
In addition, as shown in figure 4, in order to increase bandwidth of operation, can be set in respectively using band center 25-125GHz,
5-25GHz, 1-5GHz optical filter 45,46,47, optical signal 41 that phase is modulated while split is connect into multiple parallel
Receive device 46.Using the higher laser power of three times, higher performance can be obtained simultaneously in all three frequency bands.
Fig. 5, which is shown, is assemblied in electrical-optical substrate, such as LiNbO3On, for high (10- ＞ 100GHz) RF frequency
The reconfigurable optical filter of high speed.
Provide the implementation of integrated, combination reconfigurable filter apparatus at a high speed.Based on LiNbO3Ripple
Lead the high speed of delay line circuit, reconfigurable optical filter 50 can be used in high RF frequency handling optical signal, and
High-speed electronic components are not needed.Therefore, the filter assembly is actually more succinct for higher RF frequency and is lost
It is lower, therefore can be extended to ＞ 100GHz operations.
As Fig. 5 is illustrated, the tunable photo-coupler 51 of electrical-optical is combined with phase tuner element 53, it is allowed to filter
The optical frequency transmission spectrum of device 54 has the reconfigurable property of high speed.In the application of high RF frequency, such wave filter is come
Say, required difference optical delay line is very short so that make multiple filter 54 succinct, low-loss is integrated as shown in Figure 5
It is extremely important.
Fig. 6 schematically depicts the example using dual output optical delay line wave filter.The carrier power being filtered out is with new
The form of laser cavity feeds back to laser.
In addition to the basic realization of above fiber link, these are for some in improved additional implementations.
Different from wasting the light carrier power being filtered out, the present invention can utilize the light with dual output port 65,66 to prolong
When line filter 22, carrier power 62 is fed back into 64 lasing light emitters 10 schematically illustrated such as Fig. 5.
From the carrier wave being filtered out of an output in the output port 65 of the wave filter 22 of only decay-carrier wave of light delay
Power 62 can feed back to 63 lasers-formed, and it internal has the new of laser component, phase-modulator and optical filter 22
Laser cavity 10.The progress can eliminate luminous power waste, and increase entirety " wall inserts (wall-plug) " efficiency of system.
Fig. 7 schematically shows the example using narrow line reflection type optical filter, such as grating.Unwanted remaining light
Carrier power feeds back to laser, forms new laser cavity.
It is different from wasting the light carrier power being filtered out, as Fig. 7 is schematically illustrated, filtered using only carrier wave reflection-type
Device, such as grating filter 72, the present invention can feed back to the carrier power lasing light emitter 10.Light, which feeds back to laser, to be meaned
The new laser chamber 70 of laser component 10, phase-modulator 12 and optical filter 72 is configured with it.
Fig. 8 schematically depicts to be prolonged using the additional optical of single output optical fibre and single photodetector increase link gain
When line and polarization multiplexer example.
As shown in Figure 8 schematically, transmitted for the optical fiber of narrow band RF signals 81, it is available to have what is be suitably delayed
Additional optical delay line 82 and polarization multiplexer 84 further enhance link gain.
As shown, using dual output wave filter 82, complementary output 83 can be achieved.Generally, the light letter that transmission RF is modulated
Number preferably use single optical fiber and single photodetector 86, rather than double optical fiber and balanced detector pair.By to output
In the suitable time delayses 87 of increase, and the suitable polarization 88 of the optical signal being delayed by rotation to showing comes from
Two with the cross-polarization optical signal of two output ports can be combined with polarization multiplexer 84, and be sent to photoelectricity spy
Survey device 86.Two polarized light signals independently change into RF signals in photodetector.If differential delay (example is correctly set
Such as RF signal delay 10ps, center is at frequency 50GHz), then the complementation (out of phase) before two ports
RF signals are same-phases in photodetector 86 now, substantially export the RF of photodetector and become twice as.
Fig. 9 is schematically shown increases the additional of link gain using single output optical fibre 95 and single photodetector 96
Optical delay line and coherent combiner 94.
Alternatively, as shown in Figure 9 schematically, transmitted for the optical fiber of narrow band RF signals, it is suitable using having
The additional optical delay line of time delay and the enhancing link gain of relevant optical combiner 94 with light phase regulation.Light phase and micro-
Wave phase is all tuned to same-phase at photodetector 99.Optical signal coherently increases, and causes RF signal outputs 99 significantly
Increase.
Fig. 9 and Figure 10 schematically shows double complimentary modulators 110, additional optical delay line 112 and 113 and light multiplexing
Device 84 or optics coherence tomography coupler 94, they utilize single output optical fibre and single photodetector increase link gain.
Utilize the relevant conjunction shown in these additional optical delay lines 112 and 113 and optical multiplexer or Figure 11 shown in Figure 10
Strengthen RF optical link performances into coupler 94, the link that this intensity that can be also applied to standard is modulated, the link utilization figure
Double complementary output modulators 110 transmission narrow band RF signals 111 that 10 and Figure 11 is illustrated.
The whole link gain of RF analog fiber optic links of these implementations for strengthening arrowband, high RF frequency signal etc.
For be highly useful.
Although the invention has been described with reference to particular examples, but can be right in the case of without departing substantially from the scope of the present invention
The present invention is modified and deformed, and the scope of the present invention is defined in following claims.
Claims (34)
1. a kind of method, including：
Analog optical link is provided,
Lasing light emitter is provided,
Optical spectrum power signal from the lasing light emitter is provided,
Optical phase modulator is provided,
The optical frequency spectral power is provided to the optical phase modulator,
High frequency electrical signal source is provided,
High frequency electrical signal from the electric signal source is supplied to the optical phase modulator,
Phase-modulation is carried out to the optical frequency spectral power using the high frequency electrical signal in the optical phase modulator,
The optical signal that there is the phase of spectrum power and RF modulation sideband,s to be modulated is provided from the optical phase modulator,
Filter bank with first carrier attentuating filter and the second demodulator filter is provided,
The optical signal that the phase is modulated is supplied to the first carrier frequency decay wave filter,
The carrier frequency to decay in the optical signal that the phase is modulated,
The optical signal that carrier wave is attenuated is supplied to second demodulator filter,
Signal that carrier wave is attenuated, that phase is modulated is demodulated,
Photodetector is provided,
The optical signal that be demodulated, carrier wave is attenuated is supplied to the photodetector, and
The optical signal that the be demodulated, carrier wave is attenuated is converted into electric signal.
2. according to the method for claim 1, wherein, the offer filter bank includes：Offer two is reconfigurable
Optical filter.
3. according to the method for claim 1, wherein, the offer lasing light emitter includes：High power laser source is provided.
4. the method according to claim 11, in addition to：Increase the optical power levels (example from the high power laser source
Such as increase+10dB), it causes correspondingly by carrier signal and modulation sideband, signal increase+10dB, and wherein only carrier wave-decline
Subtract wave filter by the carrier power decay -10dB, the sideband signals modulated without+the 10dB that decays, so as to produce 10dB
Overall gain.
5. according to the method for claim 1, wherein, the offer filter bank includes：Reconfigurable, peace is provided
Twin-stage optical delay line wave filter on low-loss electrical-optical substrate, for performing tunable/reconfigurable filtering work(
Energy
6. according to the method for claim 1, in addition to the carrier signal filtered out is fed back into the lasing light emitter, so as to strengthen
Optical power efficiency.
7. according to the method for claim 6, wherein, the offer lasing light emitter, phase-modulator and the feedback include：
It is described that feeding back to for the laser modulator and the carrier signal filtered out is provided in a laser cavity of the lasing light emitter
Lasing light emitter.
8. according to the method for claim 1, wherein, the offer filter bank includes：The filter of dual output delay line is provided
Ripple device, polarization multiplexer is provided, synthesizes the output of the delay line filter into the photodetector, so as in the light
RF link gains are strengthened by the RF Phase synchronizations for exporting two delay lines at electric explorer.
9. the method according to claim 11, in addition to：Higher signal gain is obtained using another optical delay line, is carried
Coherently it is synthesized to for the light coherent signal synthesizer with time delay and by the optical signal and the RF phase signals
In the photodetector.
10. the method according to claim 11, in addition to：Higher signal gain is obtained using another optical delay line, is carried
Coherently it is synthesized to for the light coherent signal synthesizer with time delay and by the optical signal and the RF phase signals
In the photodetector.
11. according to the method for claim 1, wherein, the offer photodetector also includes providing balance photoelectricity
Detector pair.
12. a kind of device, described device include：
Analog optical link, have：
High power laser source,
The phase-modulator of the lasing light emitter is connected to,
The radio-frequency signal source of the phase-modulator is connected to,
The optical connector of the phase-modulator is connected to,
The filter bank of light center is connected to,
The filter bank has：
The first carrier wave filter of decay optical signal, and
The photodetector of phase demodulating wave filter is connected to, for the optical signal being demodulated to be converted into electric signal.
13. device according to claim 12, wherein, the carrier signal filtered out is fed back to the lasing light emitter, for increasing
The optical power efficiency of the strong analog optical link.
14. device according to claim 12, wherein, the filter bank is delayed including reconfigurable twin-stage light
Line filter.
15. device according to claim 14, wherein, the reconfigurable twin-stage optical delay line wave filter is positioned at low
Electrical-optical LiNbO is lost3On substrate.
16. device according to claim 14, in addition to another optical delay line wave filter and polarization multiplexer, will be filtered
The output of device is synthesized in the photodetector, so that by making the RF signals of two outputs same at the photodetector
Walk and strengthen RF link gains.
17. device according to claim 14, in addition to another optical delay line wave filter, and the synthesis of light coherent signal
Device, optical signal and RF phase signals are coherently synthesized in the photodetector.
18. device according to claim 17, in addition to be connected between the first wave filter and the photodetector
Additional optical delay line and optical multiplexer.
19. a kind of device, described device include：
Two reconfigurable optical filters, the carrier wave luminous power modulated suitable for correcting the phase with modulation sideband, signal
Light frequency distribution,
First in two optical filters is suitable to receive the carrier wave luminous power that the phase with modulation sideband, signal is modulated, and
And main only attenuated carrier light filters, and have influence minimum on the modulation sideband, signal, and
Second in two wave filters is suitable to carrier wave luminous power and the modulation sideband, signal that demodulation is attenuated, by what is be demodulated
Signal is sent to photodetector.
20. device according to claim 19, wherein：
First in two wave filters also includes：
Dual output, wherein
First in the dual output is suitable to transmit the carrier wave luminous power being attenuated and the modulation sideband, signal to two
Second in optical filter, and
Second in the dual output is suitable to the carrier light power transmission that will be filtered out to optical power source.
21. device according to claim 20, the optical power source also includes：
Lasing light emitter, and
Laser cavity, the lasing light emitter is connected to, wherein
Second in the dual output is connected to the laser cavity, by the carrier light power transmission being filtered out to the laser
Chamber.
22. device according to claim 21, wherein, described two reconfigurable optical filters, photodetector
Closely placed with optical power source.
23. device according to claim 22, in addition to：
Remote antenna, there is RF outputs,
Phase-modulator, the RF outputs of the remote antenna are connected to, and near the antenna,
First long optical fibers, are connected to the carrier light power output of the optical power source, and are connected to the phase-modulator
Carrier light power input, and
Second long optical fibers, are connected to the output of the phase-modulator, and are connected to described two reconfigurable light filters
The input of ripple device.
24. device according to claim 20, in addition to：
Single photodetector, and
Polarization multiplexer, second and the single photodetector of described two optical filters are connected to,
Second in described two optical filters also includes two output ports, wherein
First in described two output ports is adapted to provide for the first optical signal with the first polarization, and
Second in described two output ports is connected to
For providing the time delayses line for the optical signal being delayed by, and
Polarization rotator, the time delayses line, and the polarization of the optical signal suitable for being delayed by described in rotation are connected to, and
The second optical signal with the second polarization is provided, wherein
Second polarization of second optical signal polarizes perpendicular to the first of the first optical signal, wherein
First optical signal and second optical signal synthesize single multiplexer output in the polarization multiplexer, and it connects
It is connected to the single photodetector.
25. device according to claim 24, wherein, by first optical signal and second in the photodetector
Optical signal is converted into RF signals.
26. device according to claim 19, in addition to：
Single photodetector, and
Optics coherence tomography coupler, second be connected in described two optical filters and the single photodetector, wherein
Second in described two optical filters also includes two output ports, wherein
First in described two output ports is adapted to provide for the first optical signal, and
Second in described two output ports is connected to
Delay line, so as to provide the optical signal being delayed by, wherein
First optical signal and the second optical signal synthesize in the optics coherence tomography coupler, wherein, the optics coherence tomography coupling
Clutch has the single output for being connected to the single photodetector.
27. device according to claim 26, wherein, independently by first optical signal at the photodetector
RF signals are converted into the second optical signal.
28. a kind of method, methods described include：
Optical power source is provided,
Phase-modulator is provided,
The carrier wave luminous power from the optical power source is received in the phase-modulator,
Phase-modulation is carried out to carrier signal using RF signals,
The light frequency point for the carrier wave luminous power that phase of the amendment with modulation sideband, signal is modulated in the phase-modulator
Cloth,
Two reconfigurable optical filters are provided,
The phase with the modulation sideband, signal is received in first of described two reconfigurable optical filters
The carrier wave luminous power that position is modulated,
The main carrier wave luminous power that only decays, has to the modulation sideband, signal in first of described two optical filters
There is minimum influence, and
The carrier wave optical signal being attenuated and the modulation sideband, signal are sent to second of described two optical filters,
The modulation sideband, signal is demodulated in second of described two optical filters, and the sideband signals being demodulated are passed
Deliver to photodetector.
29. the method according to claim 11, in addition to：
First in described two optical filters with dual output is provided, and
The carrier wave optical power signals being attenuated and modulation sideband, signal are transmitted to described two from first in the dual output
Second in individual optical filter, and
The carrier wave luminous power being filtered out is transmitted to the optical power source from second of the dual output.
30. the method according to claim 11, in addition to：
By the optical power source, described two reconfigurable optical filters and the photodetector close to placing together,
Remote antenna is provided,
The phase-modulator is placed close to the remote antenna,
RF signals from the remote antenna are supplied to the phase-modulator,
First long optical fibers are provided,
The carrier wave luminous power from the optical power source is transmitted by first long optical fibers,
Second long optical fibers are provided, and
The luminous power that the phase from the phase-modulator is modulated is transmitted to described two by the long optical fibers and weighed
First in the optical filter newly configured.
31. the method according to claim 11, in addition to：
There is provided with the first input and the polarization multiplexer of the second input and single output, and
Two output ports are provided on second of described two reconfigurable optical filters, wherein
There is provided the photodetector includes：Single photodetector is provided,
First optical signal of the first polarization is provided to the described first input from first output port,
The second optical signal from second output port is provided by delay line, and the optical signal being delayed by is provided,
The polarization of the optical signal being delayed by is rotated into the second polarization for being orthogonal to first polarization, and by described the
One and second optical signal provide to the polarization multiplexer, and
The polarisation-multiplexed signal of output from the polarization multiplexer is provided to the single photodetector.
32. the method according to claim 11, in addition to：
There is provided with the first input and the optics coherence tomography coupler of the second input and single output,
Two output ports are provided on second of the reconfigurable optical filter, wherein
There is provided the photodetector includes：Single photodetector is provided,
The first optical signal from first output port is provided to first input of the optics coherence tomography coupler,
It will be provided by delay line from the second optical signal of second output port to described in the optics coherence tomography coupler
Second input,
First optical signal and the optical signal being delayed by are provided to described the of the optics coherence tomography coupler respectively
One input and the second input,
First and second optical signal is synthesized in the optics coherence tomography coupler,
Composite signal from the optics coherence tomography coupler is provided to the single photodetector.
33. a kind of method, methods described include：
RF input modulation light energies are utilized in 1 × 2 dual output intensity modulator, there is provided optical delay line is connected to dual output
One,
Postpone the first optical signal in the optical delay line,
To 90 ° of the first optical signal rotatory polarization,
Using polarization multiplexer by the first optical signal for postponing and rotating and another the second light in the dual output
Signal synthesizes, wherein the polarization multiplexer has single output, and
First and second optical signals of synthesis are provided to photodetector.
34. a kind of method, methods described include：
Light energy is modulated using RF inputs in 1 × 2 dual output intensity modulator,
One that optical delay line is connected in dual output is provided,
Postpone the first optical signal in optical delay line,
Using coherent combiner, by the first optical signal being delayed by and in the dual output, another the second optical signal closes
Into, wherein the coherent combiner has single output, and
The signal of synthesis is supplied to photodetector.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2015/057990 WO2017086903A1 (en) | 2015-11-16 | 2015-11-16 | High-rf-frequency analog fiber-optic links using optical signal processing |
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| Publication Number | Publication Date |
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| CN107408984A true CN107408984A (en) | 2017-11-28 |
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| Country | Link |
|---|---|
| EP (1) | EP3378174A1 (en) |
| JP (1) | JP2019501542A (en) |
| CN (1) | CN107408984A (en) |
| WO (1) | WO2017086903A1 (en) |
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| CN112654915A (en) * | 2018-07-25 | 2021-04-13 | 协同微波公司 | Optoelectronic oscillator using monolithically integrated multiple quantum well laser and phase modulator |
| CN112698355A (en) * | 2020-12-03 | 2021-04-23 | 董晶晶 | Multi-wavelength coherent laser radar based on electro-optical modulation technology |
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| CN111337052B (en) * | 2020-03-20 | 2024-03-22 | 北京世维通光智能科技有限公司 | Y waveguide parameter measuring instrument, measuring system and measuring method |
| CN111693133B (en) * | 2020-06-24 | 2022-04-15 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Optical path difference testing device and method for optical fiber hydrophone and computer equipment |
| US20230269005A1 (en) * | 2020-07-09 | 2023-08-24 | Nippon Telegraph And Telephone Corporation | Optical network system, operating method of optical network system, and optical line terminator |
| CN114024613B (en) * | 2021-10-21 | 2024-02-02 | 西北工业大学 | Polarization multiplexing high-linearity full-duplex optical carrier radio frequency link device and method |
| CN115453553B (en) * | 2022-08-22 | 2024-06-18 | 上海无线电设备研究所 | Low-repetition-frequency anti-fuzzy Doppler frequency measurement system based on active optical fiber resonant ring |
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Also Published As
| Publication number | Publication date |
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| EP3378174A1 (en) | 2018-09-26 |
| JP2019501542A (en) | 2019-01-17 |
| WO2017086903A1 (en) | 2017-05-26 |
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