CN104852272A - Optical function signal generator synthesized by multi-wavelength harmonic frequency time domains - Google Patents
Optical function signal generator synthesized by multi-wavelength harmonic frequency time domains Download PDFInfo
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Abstract
The invention provides an optical function signal generator synthesized by multi-wavelength harmonic frequency time domains. The optical function signal generator comprises a multi-wavelength multifrequency mode-locking laser module 1 and a phase and amplitude control synthesis module 2, the multi-wavelength multifrequency mode-locking laser module 1 is a mode-locking laser provided with more than two optical oscillation loops, and the structure includes more than two optical annular branch circuits. Each annular branch circuit can produce photon radiofrequency signals with different wavelengths and different harmonic frequencies and output the signals to the phase and amplitude control synthesis module, and the phase and the amplitude of the signals of each branch circuit are adjusted via the phase and amplitude control module so that desired optical function waveform signals can be finally synthesized. According to the optical function signal generator, the generation and separation of the harmonic frequency of the photon radiofrequency signals are flexible, phase and amplitude control of the signals is accurate, the signal waveform quality is high, the system stability is good, the operation is easy and convenient, and an incoherent light system is employed so that interference introduction and noise disturbance are avoided.
Description
Technical field
The present invention relates to the fields such as optical communication, optical measurement and optical sensing, the especially optical function signal generator of multi-wavelength harmonic frequency time history synthesis.
Background technology
The optical signalling waveform that optics arbitrary function signal generator can produce has polytype, as square wave, triangular wave, sawtooth waveforms etc.The fields such as the pattern generation of data-signal, systematic function detection and sensing network application can be widely used in.
Optics arbitrary function signal generator is exactly that one gives full play to photon technology speciality and advantage, and selective binding electronic technology feature produces the device of random waveform.In recent years, optical function signal generator obtains to be studied widely, and all in all, realizing optical function waveform generation has two kinds of thinkings:
1, directly optic spectrum line is separated in area of light, handles and synthesizes, the plenoptic function waveform signal needed for the last synthesis of accurate manipulation is carried out to parameters such as the amplitude of each road spectral line be separated and phase places.The advantage of the method can accurately control each line parameters thus synthesizing optical arbitrary function waveform signal, and it can break through " electronic bottleneck " restriction, directly obtains high repetition frequency waveform signal in area of light.But its shortcoming is that the system configuration of this method is complicated, optics comb spectrum can be divided into n road by filter or grating on wavelength under normal circumstances, and the optics pectination spectrum wavelength needing filter window to be separated with needs is accurately aimed at, make the selection of spectral line and mask work particularly difficult, also to carry out amplitude to the isolated spectral line in each road afterwards, the accurate manipulation of phase place etc., this will considerably increase experimental implementation difficulty and workload, secondly, the method system configuration is vulnerable to extraneous factor (as temperature, stress) impact that changes, finally have influence on the quality of optical function signal and the stability of system of generation.Wherein the optics arbitrary function signal generator of passive filter filtering is exactly the typical scenario adopting the method.
2, the shaping generation of optical function signal is realized based on modulation reshaping combine with technique optical instrument.The method obtains initialize signal waveform by the modulation means on basis, then utilize the means such as filtering, phase shift to be processed on the whole thus obtain required optical function waveform.The advantage of this method is operationally simple and convenient, can regulate timely and effectively the signal waveform produced by changing the factors such as modulation parameter, and the frequency of the signal waveform produced can be carried out tuning according to the difference of modulating frequency, system stability can not disturb by extraneous factor.The shortcoming of this method is with signal overall frequency component for object, can not carry out shaping accurately control the phase place of each spectral components and amplitude, produce the difficult quality guarantee of signal.
Summary of the invention
The object of the invention is: the optical function signal generator that a kind of multi-wavelength harmonic frequency time history synthesis is provided, its photon microwave multiple-harmonic signal produces easy, harmonic frequency produce with is separated flexibly, signal phase and amplitude control accurate, signal waveform quality is high, the stability of a system is good, simple and convenient, to overcome the deficiencies in the prior art.
The present invention is achieved in that the optical function signal generator of multi-wavelength harmonic frequency time history synthesis, comprise multi-wavelength multifrequency mode-locked laser module and phase place and amplitude and control synthesis module, multi-wavelength multifrequency mode-locked laser module is an optical fiber ring laser comprising two or more optics annular branch road, wherein each branch road operation wavelength is different, and each respective input that the output of each branch road controls synthesis module with phase place and amplitude is respectively connected.
The major loop of described multi-wavelength multifrequency mode-locked laser module is connected and composed successively by the wavelength division multiplexer of the wavelength division multiplexer of semiconductor optical amplifier, optical isolator, 1 × n, n × 1, analyzer, optical polarization controller, electrooptic modulator and optical polarization controller, wherein n be greater than 2 natural number, radio frequency source is connected with the rf inputs of electrooptic modulator, described multi-wavelength multifrequency mode-locked laser module comprises plural optical branch, the output port of branch road is connected with the input of an optical polarization controller, the output of optical polarization controller is connected with the input of erbium-doped fiber amplifier, the output of erbium-doped fiber amplifier is connected with the input of optical coupler, optical coupler comprises two outputs, one of them output is connected with the input of tunable optical delay line, another output is then connected to phase place and controls on the corresponding input of synthesis module to amplitude, the output of tunable optical delay line is connected with the wavelength division multiplexer input port of n × 1, and be connected with major loop by closing road output port, form an optical fiber ring laser, all branch roads all connect with above-mentioned connected mode.
Described phase place and amplitude control synthesis module and comprise plural optical branch, wherein in any one branch road, the output of tunable optical delay line is connected with the input of adjustable optical attenuator, and adjustable optical attenuator output is connected with optics mixer input port; Optics mixer closes road output port and is connected with photodetector input, and signal detects through photodetector and exports from its output; The input of tunable optical delay line is corresponding with the output of each branch road of multi-wavelength multifrequency mode-locked laser module to be connected.
The wavelength division multiplexer of 1 described × n is input port number is 1, output port number is the wavelength division multiplexer of n; N be greater than 2 natural number; The wavelength division multiplexer of described n × 1 is input port number is n, output port number is the wavelength division multiplexer of 1; N be greater than 2 natural number.
In multi-wavelength multifrequency mode-locked laser modular structure, each annular branch road can export the photon radio-frequency signal with different wave length and different harmonic frequency from of an optical coupler output.
Described electrooptic modulator is semiconductor electric absorption modulator or lithium niobate intensity modulator.
Described phase place and the amplitude optics mixer controlled in synthesis module is the wavelength division multiplexer of n × 1 or the optical coupler of n × 1; N be greater than 2 natural number.
In the present invention, in multi-wavelength multifrequency mode-locked laser module 1 main ring, semiconductor optical amplifier 1a spontaneous radiation goes out wave-length coverage and is
λ 1 ~ λ 2 wide spectrum optical
,and each annular branch road is all have the long independent resonant chamber of different cavity, therefore in each branch road, light field meets resonant cavity positive feedback and resonance condition and will determine a series of starting of oscillation pattern and frequency interval between starting of oscillation pattern is determined by loop-length, i.e. resonator mould
f c =c/ (n eff l), n eff be effective refractive index in chamber, L is that annular chamber chamber is long.Rational number harmonic mode-locking technology, i.e. modulating frequency f
mfor resonator mould f
ca ± c/b(a, b, c are positive integer, c < b, and c and b is mutual prime rwmber) doubly, as long as that is make this harmonic component enough large, enough gains can be provided in chamber in other words, just can reach the pulse output of b frequency multiplication.Namely in theory, modulating frequency f in multi-wavelength multifrequency mode-locked laser
m=(a ± c/b)
f c , the harmonic frequency of each branch output signal
f k =bf m =(ab ± c) f c .By regulating tunable optical delay line 1gn(n=1 in each annular branch road respectively, 2,3 ...) the envelope time delay of each road harmonic signal can be changed, namely each branch road resonator is long changes, and finally causes each annular branch road resonator mould f
cdifferent, the harmonic frequency f of the different wave length photon radiofrequency signal finally making each branch road produce
kdifferent.The laggard applying aspect of harmonic frequency of the photon radio-frequency signal that each annular branch road of appropriate selection produces and amplitude control module 2, tunable optical delay line 2an(n=1 in phase place and amplitude control module 2 on each branch road, 2,3 ...) time delay is carried out to the envelope of each road harmonic signal, adjustable optical attenuator 2bn(n=1,2,3 ...) adjustable attenuation is carried out to each light field amplitude.Compared to existing optical function signal generating method, each branch road independently controls this road photon radio-frequency signal phase and amplitude can be eliminated with signal overall frequency component as object, the phase place that can not be separated each spectrum and amplitude carry out the drawback that shaping accurately controls, and it also avoid that to carry out to spectral components the complexity that phase place and amplitude control in space optical path loaded down with trivial details, the photon radio-frequency signal phase making each optical branch of the present invention produce and amplitude control accurately, Dynamic System signal quality that is simple and convenient, that produce is high.After the parameters such as the harmonic frequency to each tributary signal, phase place and amplitude accurately control, each branch road light field is synthesized in optics mixer 2c more afterwards, detects afterwards through photodetector 2d, finally obtains the optics arbitrary function waveform signal wishing to produce.The whole signals transmission of the present invention carries out all in a fiber, compared to existing optical function signal generating method, present system adopts incoherent light system, the photon radio-frequency signal wavelength that each annular branch road produces is different, avoid each road and occurring interference when time delay superposes, it also avoid the introducing of interference and the disturbance of interaction noise, enhance the stability of system simultaneously.
Owing to have employed above technical scheme, compare existing optical function signal generating method, the present invention does not need to carry out complicated spectral line and is separated and filtering, and save the use of optically filtering device, for the harmonic frequency realizing each tributary signal needed for optical function Waveform composition obtains by directly regulating tunable optical delay line, this make the harmonic frequency of the present invention's each branch road photon radio-frequency signal produce be separated flexible and convenient, generation optical function signal quality high.Optical function Waveform composition of the present invention adopts incoherent light system, avoids the noise disturbance of interfering and introducing and bringing, enhances the stability of system simultaneously, have convenient, flexible, practical feature.
Accompanying drawing illustrates,
Accompanying drawing 1 is structural representation of the present invention.
Embodiment,
Embodiments of the invention 1: the optical function signal generator of multi-wavelength harmonic frequency time history synthesis, comprise multi-wavelength multifrequency mode-locked laser module 1, phase place and amplitude control synthesis module 2, multi-wavelength multifrequency mode-locked laser module 1 is an optical fiber ring laser comprising n optics annular branch road, wherein each branch road operation wavelength is different, and each respective input that the output of each branch road controls synthesis module 2 with phase place and amplitude is respectively connected;
In the present embodiment, the major loop of multi-wavelength multifrequency mode-locked laser module 1 is connected and composed successively by wavelength division multiplexer 1h, the analyzer 1i of wavelength division multiplexer 1c, n × 1 of semiconductor optical amplifier 1a, optical isolator 1b, 1 × n, optical polarization controller 1j, electrooptic modulator 1k and optical polarization controller 1m, wherein n be greater than 2 natural number, radio frequency source 1l is connected with the rf inputs of electrooptic modulator 1k, multi-wavelength multifrequency mode-locked laser module 1 comprises the optical branch of n, the output port of branch road inputs with optical polarization controller ld and is connected, the output of optical polarization controller 1d is connected with the input of erbium-doped fiber amplifier 1e, the output of erbium-doped fiber amplifier 1e is connected with the input of optical coupler 1f, optical coupler 1f comprises two outputs, one of them output is connected with the input of tunable optical delay line 1g, another output is then connected to phase place and controls on the corresponding input of synthesis module 2 to amplitude, the output of tunable optical delay line 1g is connected with the wavelength division multiplexer 1h input port of n × 1, and be connected with major loop by closing road output port, form an optical fiber ring laser, all branch roads all connect with above-mentioned connected mode.
Phase place and amplitude control synthesis module 2 and comprise n optical branch, and wherein in any one branch road, the output of tunable optical delay line 2a is connected with the input of adjustable optical attenuator 2b, and adjustable optical attenuator 2b output is connected with optics mixer 2c input port 2c; Optics mixer 2c closes road output port and is connected with photodetector 2d input, and signal detects through photodetector 2d and exports from its output; The input of tunable optical delay line 2a is corresponding with the output of each branch road of multi-wavelength multifrequency mode-locked laser module 1 to be connected.
In multi-wavelength multifrequency mode-locked laser module 1 structure, each annular branch road can export the photon radio-frequency signal with different wave length and different harmonic frequency from of an optical coupler 1f output.
Described electrooptic modulator 1k is semiconductor electric absorption modulator or lithium niobate intensity modulator.
Described phase place and the amplitude optics mixer 2c controlled in synthesis module 2 is the wavelength division multiplexer of n × 1 or the optical coupler of n × 1; N be greater than 2 natural number.
Use the concrete scheme of the present embodiment as follows:
(1) multi-wavelength multifrequency mode-locked laser module 1 is a mode-locked laser with n optics vibration, comprises the optical branch that in major loop and a pair loop, wavelength division multiplexer (1c, 1h) forms.During work, in main ring, semiconductor optical amplifier 1a sends wide spectrum optical due to spontaneous radiation, and wave-length coverage is
λ 1 ~ λ 2 , the interface channel of wavelength division multiplexer (1c, 1h) determines the wavelength of whole annular branch road vibration, and between each annular branch road, the wavelength interval of light field is Δ
λ, by regulating the tunable optical delay line 1gn(n=1 in each branch road respectively, 2,3 ...) adjustable each road light field time delay thus change the optical path length of each annular branch road, the chamber namely changing each loop independent resonant chamber is long, due to chamber mould
f c =c/ (n eff l),
n eff be effective refractive index in chamber, L is that annular chamber chamber is long, therefore regulates each branch road tunable optical delay line can cause chamber, corresponding each road mould
change, and make the modulating frequency f that radio frequency source 1l provides
mwith chamber, each road mould f
mmeet rational number harmonic mode-locking condition, each annular branch road exports the light field signal of different wave length and the harmonic frequency of its output signal
f k =bf m =(ab ± c) f c (a, b, c are positive integer, c < b, and c and b is mutual prime rwmber).The output of multi-wavelength multifrequency mode-locked laser module 1 directly enters phase place and amplitude controls synthesis module 2.
(2) each road light field that phase place and amplitude control synthesis module 2 is entered, the envelope time delay Δ T successively by regulating tunable optical delay line 2an to regulate harmonic signal
n(
n=1,2,3 ...), adjustment adjustable optical attenuator 2bn controls the power proportions between the signal of each road, and last each road signal detects through photodetector 2d after synthesizing in optics mixer 2c, can obtain the optics arbitrary function waveform signal wishing to produce.
Operation principle is:
Multi-wavelength multifrequency mode-locked laser module 1 is a mode-locked laser with n optics vibration, comprises the optical branch that in major loop and a pair loop, wavelength division multiplexer (1c, 1h) forms.Before analyzer 1i is placed on MZ Mach-Zehnder 1k in major loop, the light field of n annular branch road can be allowed to have identical polarization direction.MZ Mach-Zehnder 1k is the main devices in mode-locked laser, is driven by radio frequency source 1l.Optical polarization controller 1j, 1m can control the polarization state of the n before entering MZ Mach-Zehnder annular branch road light field respectively and be modulated the polarization state of the rear n exported an annular branch road light field by MZ Mach-Zehnder 1k.Semiconductor optical amplifier 1a is used as gain media and suppresses supermode noise thus ensure that system stability exports in main ring.The effect of optical isolator 1b in ring ensures each light field clockwise transmission in multi-wavelength multifrequency mode-locked laser module 1.The interface channel of wavelength division multiplexer (1c, 1h) determines the wavelength of whole loop oscillation, and each adjacent legs wavelength interval is
Δ
λ therefore 1 × n wavelength division multiplexer 1c can separate the interface channel of n different transmission wavelength, erbium-doped fiber amplifier 1en(n=1 in each branch road separated, 2,3 ...) can be used to the insertion loss compensating optics in each ring lock mode laser, tunable optical delay line 1gn(n=1 in each branch road, 2,3 ...) optical path length of each annular branch road can be adjusted thus long independent resonant chamber, chamber needed for each road can be formed.Optical coupler 1fn(n=1 in each branch road, 2,3 ...) there are two light output ends 1fn1,1fn2, an output 1fn1 continues in mode-locked laser, transmit this road light field signal and enters n × 1 wavelength division multiplexer 1h, n × 1 wavelength division multiplexer 1h can export the synthesis of the input signal of n branch road, and in each adjacency channel, optical field wavelength difference is
Δ
λ , therefore can not interfere.And optical coupler 1fn(n=1, 2, 3 ...) another output 1fn2(n=1, 2, 3 ...) export each branch road light field signal and enter phase place and amplitude control module 2, tunable optical delay line 2an(n=1 on phase place and each branch road of amplitude control module 2, 2, 3 ...) time delay can be carried out to the envelope of each road signal entered, adjustable optical attenuator 2bn(n=1, 2, 3 ...) can the signal power entering each branch road be decayed, last each road light field is synthesized in the optics mixer 2c served as by n × 1 wavelength division multiplexer, detect through photodetector 2d more afterwards, finally obtain the optics arbitrary function waveform signal wishing to produce.
In multi-wavelength multifrequency mode-locked laser module 1 main ring, semiconductor optical amplifier 1a can send wide spectrum optical due to spontaneous radiation, and wave-length coverage is
λ 1 ~ λ 2 ,and each annular branch road is all have the long independent resonant chamber of different cavity, therefore in each branch road, light field meets resonant cavity positive feedback and resonance condition and will determine a series of starting of oscillation pattern and frequency interval between starting of oscillation pattern is determined by loop-length, i.e. resonator mould
f c =c/ (n eff l),
n eff be effective refractive index in chamber, L is that annular chamber chamber is long.Rational number harmonic mode-locking technology, i.e. modulating frequency
for resonator mould
a ± c/b(a, b, c are positive integer, c < b, and c and b is mutual prime rwmber) doubly, as long as that is make this harmonic component enough large, enough gains can be provided in chamber in other words, just can reach the pulse output of b frequency multiplication.Namely in theory, modulating frequency f in multi-wavelength multifrequency mode-locked laser
m=(a ± c/b)
f c , the harmonic frequency of each branch output signal
f k =bf m =(ab ± c) f c .By regulating tunable optical delay line 1gn in each annular branch road can change the envelope time delay of each road harmonic signal respectively, namely each branch road resonator is long changes, and finally causes each annular branch road resonator mould
f c different, the harmonic frequency of the different wave length photon radiofrequency signal finally making each branch road produce
f k different, the laggard applying aspect of harmonic frequency of the photon radio-frequency signal that each annular branch road of appropriate selection produces and amplitude control module 2, tunable optical delay line 2an(n=1 in phase place and amplitude control module 2 on each branch road, 2, 3 ...) time delay is carried out to the envelope of each road harmonic signal, adjustable optical attenuator 2bn(n=1, 2, 3 ...) adjustable attenuation is carried out to each light field amplitude, through the harmonic frequency to each tributary signal, the parameter such as phase place and amplitude accurately controls rear each branch road light field and synthesizes in the wavelength division multiplexer 2c of n × 1, detect through photodetector 2d afterwards, finally obtain the optics arbitrary function waveform signal wishing to produce.
Of the present inventionly be not limited to the embodiment described in embodiment, those skilled in the art's technical scheme according to the present invention draws and other execution mode belongs to technological innovation scope of the present invention equally.Obvious those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (7)
1. the optical function signal generator of a multi-wavelength harmonic frequency time history synthesis, comprise multi-wavelength multifrequency mode-locked laser module (1), phase place and amplitude control synthesis module (2), it is characterized in that: multi-wavelength multifrequency mode-locked laser module (1) is an optical fiber ring laser comprising two or more optics annular branch road, wherein the operation wavelength of each branch road is different, and each respective input that the output of each branch road controls synthesis module (2) with phase place and amplitude is respectively connected.
2. the optical function signal generator of multi-wavelength harmonic frequency time history synthesis according to claim 1, is characterized in that: the major loop of described multi-wavelength multifrequency mode-locked laser module (1) is connected and composed successively by the wavelength division multiplexer (1h) of the wavelength division multiplexer (1c) of semiconductor optical amplifier (1a), optical isolator (1b), 1 × n, n × 1, analyzer (1i), optical polarization controller (1j), electrooptic modulator (1k) and optical polarization controller (1m), wherein n be greater than 2 natural number, radio frequency source (1l) is connected with the rf inputs of electrooptic modulator (1k), described multi-wavelength multifrequency mode-locked laser module (1) comprises plural optical branch, the output port of branch road inputs with optical polarization controller (ld) and is connected, the output of optical polarization controller (1d) is connected with the input of erbium-doped fiber amplifier (1e), the output of erbium-doped fiber amplifier (1e) is connected with the input of optical coupler (1f), optical coupler (1f) comprises two outputs, one of them output is connected with the input of tunable optical delay line (1g), another output is then connected to phase place and amplitude controls on the corresponding input of synthesis module (2), the output of tunable optical delay line (1g) is connected with wavelength division multiplexer (1h) input port of n × 1, and be connected with major loop by closing road output port, form an optical fiber ring laser, all branch roads all connect with above-mentioned connected mode.
3. the optical function signal generator of multi-wavelength harmonic frequency time history synthesis according to claim 2, is characterized in that: the wavelength-division of 1 described × n is multiple
With device (1c) for input port number be 1, output port number is the wavelength division multiplexer of n; N be greater than 2 natural number; The wavelength division multiplexer (1h) of described n × 1 for input port number be n, output port number is the wavelength division multiplexer of 1; N be greater than 2 natural number.
4. the optical function signal generator of multi-wavelength harmonic frequency time history synthesis according to claim 1, it is characterized in that: described phase place and amplitude control synthesis module (2) and comprise plural optical branch, wherein in any one branch road, the output of tunable optical delay line (2a) is connected with the input of adjustable optical attenuator (2b), and adjustable optical attenuator (2b) output is connected with optics mixer (2c) input port (2c); Optics mixer (2c) closes road output port and is connected with photodetector (2d) input, and signal detects through photodetector (2d) and exports from its output; The input of tunable optical delay line (2a) is corresponding with the output of each branch road of multi-wavelength multifrequency mode-locked laser module (1) to be connected.
5. the optical function signal generator of multi-wavelength harmonic frequency time history synthesis according to claim 1 and 2, it is characterized in that: in multi-wavelength multifrequency mode-locked laser module (1) structure, each annular branch road can export the photon radio-frequency signal with different wave length and different harmonic frequency from the output of optical coupler (1f).
6. the optical function signal generator of multi-wavelength harmonic frequency time history synthesis according to claim 1 and 2, is characterized in that: described electrooptic modulator (1k) is semiconductor electric absorption modulator or lithium niobate intensity modulator.
7. the optical function signal generator of the multi-wavelength harmonic frequency time history synthesis according to claim 1 or 4, is characterized in that: described phase place and amplitude control the optical coupler of wavelength division multiplexer that the optics mixer (2c) in synthesis module (2) is n × 1 or n × 1; N be greater than 2 natural number.
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| CN104852272B (en) | 2018-08-28 |
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