CN109768831A - The adjustable multimode optical-electronic oscillator of Free Spectral Range and multimode signal production method - Google Patents
The adjustable multimode optical-electronic oscillator of Free Spectral Range and multimode signal production method Download PDFInfo
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- CN109768831A CN109768831A CN201910192946.5A CN201910192946A CN109768831A CN 109768831 A CN109768831 A CN 109768831A CN 201910192946 A CN201910192946 A CN 201910192946A CN 109768831 A CN109768831 A CN 109768831A
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Abstract
The present invention provides a kind of adjustable multimode optical-electronic oscillator of Free Spectral Range and multimode signal production methods, belong to Microwave photonics technical field.The multimode optical-electronic oscillator includes: laser, intensity modulator, electricity tune time delay optical fiber, erbium-doped fiber amplifier, photodetector, electric amplifier and power splitter；The laser is connect with the intensity modulator, the intensity modulator, erbium-doped fiber amplifier, photodetector, electric amplifier and power splitter are sequentially connected from head to tail to form loop, and the electricity adjusts time delay optical fiber for connecting the intensity modulator and the erbium-doped fiber amplifier.The present invention can make the Free Spectral Range cyclically-varying of the multimode signal generated, and be that the Free Spectral Range of multimode signal can be continuously adjusted quickly.
Description
Technical field
The present invention relates to Microwave photonics technical field more particularly to a kind of adjustable multimode photoelectricity vibrations of Free Spectral Range
Swing device and multimode signal production method.
Background technique
Optical-electronic oscillator can generate microwave frequency height, the high low phase of Q value as a kind of novel microwave signal generator
The signal for high-quality of making an uproar and have tunability and two kinds of photoelectricity output, be a kind of microwave signal generator of ideal type.
With the development of technology, optical-electronic oscillator has also derived some new applications, for example carries out letter with multimode optical-electronic oscillator
Road and the detection of weak signal etc..2009, V.J.Urick et al. proposed a kind of multimode photoelectricity vibration in the research of oneself
The structure for swinging device proposes the channelizing that multimode optical-electronic oscillator is used for radiofrequency signal, can be used for optical signal processing technology.
2010, Preetpaul S.Devgan, et al. propose with multimode optical-electronic oscillator realize weak signal detection and selectivity
Ground amplification.It is attracted much attention it can be seen that multimode optical-electronic oscillator is just gradually entering into the visual field of people.However it is existing
The Free Spectral Range of multimode signal caused by multimode optical-electronic oscillator is substantially fixed constant, can not expire
The demand of sufficient practical application.
Summary of the invention
(1) technical problems to be solved
The present invention provides a kind of adjustable multimode optical-electronic oscillator of Free Spectral Range and multimode signal production method, with
At least partly solve technical problem set forth above.
(2) technical solution
According to an aspect of the invention, there is provided a kind of adjustable multimode optical-electronic oscillator of Free Spectral Range, comprising:
Laser 1, intensity modulator 2, electricity adjust time delay optical fiber 3, erbium-doped fiber amplifier 4, photodetector 5, electrically amplified
Device 6 and power splitter 7；
The laser 1 is connect with the intensity modulator 2, the intensity modulator 2, erbium-doped fiber amplifier 4, photoelectricity
Detector 5, electric amplifier 6 and power splitter 7 are sequentially connected from head to tail to form loop, and it is described strong that the electricity adjusts time delay optical fiber 3 to connect
Spend modulator 2 and the erbium-doped fiber amplifier 4.
In some embodiments, between the laser 1 and the intensity modulator 2 and the erbium-doped fiber amplifier
It is connected by optical fiber between 4 and the photodetector 5.
In some embodiments, lead between the photodetector 5, electric amplifier 6, power splitter 7 and intensity modulator 2
Cross cable connection.
In some embodiments, it is the high q-factor microwave energy-storage element with optical nonlinearity that the electricity, which adjusts time delay optical fiber 3,
Length continuously adjustable in its line attachment, length are several centimeters to tens of kms；The electricity adjusts time delay optical fiber 3 for stablizing
Output generates highly sensitive periodic waveform.
In some embodiments, the period of change and signal that the electricity adjusts time delay optical fiber 3 are in the multimode optical-electronic oscillator
The delay transmitted one week in loop matches, and meets Fourier mode locking condition:
NT=Tr
Wherein, n is positive integer, and T is the period of change that electricity adjusts time delay optical fiber length, and Tr is that signal shakes in the multimode photoelectricity
Swing the delay transmitted in device loop one week.
In some embodiments, the Free Spectral Range of the multimode optical-electronic oscillator is by the multimode optical-electronic oscillator ring
Length and the optical fibre refractivity decision on road, specific formula are as follows:
Wherein, n is optical fibre refractivity, and c is the light velocity in vacuum, and L is the length of multimode optical-electronic oscillator loop.
In some embodiments, when the optical fibre refractivity n is constant, the length of delay circuit 3 is adjusted by adjusting the electricity
Degree, changes the length L of the multimode optical-electronic oscillator loop, realizes that the multimode optical-electronic oscillator Free Spectral Range is adjustable.
In some embodiments, the dispersion of the multimode optical-electronic oscillator loop is zero, so that the signal of different frequency exists
Delay having the same in the loop.
In some embodiments, the intensity modulator 2 is used to modulate the optical signal that the laser 1 issues；It is described to mix
Doped fiber amplifier 4 is used to amplify the optical signal that the electricity adjusts time delay optical fiber 3 to transmit；The photodetector 5 is used for
The optical signal that the erbium-doped fiber amplifier 4 transmits is converted into electric signal；The electric amplifier 6 is used for the photodetection
The electric signal that device 5 transmits amplifies；The power splitter 7 is used to the electric signal that photoamplifier 6 transmits being divided into two parts, and one
Part is for exporting, and a part is for feeding back to intensity modulator 2.
According to another aspect of the present invention, provide it is a kind of can using Free Spectral Range provided by above-described embodiment
The method that the multimode optical-electronic oscillator of tune generates multimode signal, which comprises
Laser 1 issues optical signal and is transmitted to intensity modulator 2；
After the intensity modulator 2 carries out intensity modulated to the optical signal, time delay optical fiber 3 is adjusted to send er-doped to by electricity
Fiber amplifier 4；
The erbium-doped fiber amplifier 4 after the optical signal of intensity modulated amplifies, is transmitted to photoelectricity spy for described
Survey device 5；
The amplified optical signal is converted to electric signal by the photodetector 5, is transmitted to electric amplifier 6；
The electric amplifier 6 amplifies the electric signal, exports through power splitter 7, and feeds back to the radio frequency of intensity modulator 2
Port forms loop；
When the gain that the optical signal that the laser 1 issues generates in the loop is higher than the damage generated in the loop
Time-consuming, the multimode optical-electronic oscillator are in starting of oscillation state, generate multimode signal；
It adjusts the electricity and adjusts the length of time delay optical fiber 3 to adjust the Free Spectral Range of the multimode signal.
(3) beneficial effect
It can be seen from the above technical proposal that the adjustable multimode optical-electronic oscillator of Free Spectral Range provided by the invention and
Multimode signal production method at least has the advantages that one of them or in which a part:
(1) the adjustable multimode optical-electronic oscillator of Free Spectral Range provided by the invention and multimode signal production method,
On the basis of the typical structure of multimode optical-electronic oscillator, Fourier mode-locking technique is introduced, time delay optical fiber is adjusted by control electricity
Length period of change and the delay transmitted one week in optical-electronic oscillator loop of signal match, meet Fourier mode locking item
Part realizes the Free Spectral Range cyclically-varying of the multimode signal of the output of multimode optical-electronic oscillator；
(2) the adjustable multimode optical-electronic oscillator of Free Spectral Range provided by the invention and multimode signal production method, can
To adjust the length of time delay optical fiber by adjusting electricity, change the length of multimode optical-electronic oscillator loop, obtaining Free Spectral Range can
The multimode signal adjusted with arbitrary continuation.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the adjustable multimode optical-electronic oscillator of Free Spectral Range provided in an embodiment of the present invention；
Fig. 2 is that the multimode signal of the adjustable multimode optical-electronic oscillator of Free Spectral Range provided in an embodiment of the present invention generates
The flow chart of method.
In above-mentioned attached drawing, appended drawing reference meaning is specific as follows:
1- laser；2- intensity modulator；3- electricity tune time delay optical fiber；4- erbium-doped fiber amplifier；5- photodetector；6-
Electric amplifier；7- power splitter.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in further detail.
According to an aspect of the invention, there is provided a kind of adjustable multimode optical-electronic oscillator of Free Spectral Range, such as Fig. 1
Shown, Fig. 1 is the structural schematic diagram of the adjustable multimode optical-electronic oscillator of Free Spectral Range provided in an embodiment of the present invention, should be certainly
It include: laser 1, intensity modulator 2, electricity tune time delay optical fiber 3, Er-doped fiber by the adjustable multimode optical-electronic oscillator of spectral region
Amplifier 4, photodetector 5, electric amplifier 6 and power splitter 7；Wherein:
Laser 1 is connect with the intensity modulator 2, intensity modulator 2, erbium-doped fiber amplifier 4, photodetector 5,
Electric amplifier 6 and power splitter 7 are sequentially connected from head to tail to form loop, and electricity adjusts 3 bonding strength modulator 2 of time delay optical fiber and er-doped light
Fiber amplifier 4.Wherein, electricity adjusts time delay optical fiber 3 for the high q-factor microwave energy-storage element with optical nonlinearity, in line attachment
Length continuously adjustable, length is several centimeters to tens of kms, for stablizing output, generates highly sensitive periodic waveform.
In the present embodiment, between laser 1 and intensity modulator 2 and erbium-doped fiber amplifier 4 and photodetector 5
Between pass through optical fiber connect；Connected between photodetector 5, electric amplifier 6, power splitter 7 and intensity modulator 2 by cable
It connects.
In the present embodiment, the period of change and signal that electricity adjusts time delay optical fiber 3 are in the multimode optical-electronic oscillator loop
The delay of transmission one week matches, and meets Fourier mode locking condition:
NT=Tr
Wherein, n is positive integer, and T is the period of change that electricity adjusts time delay optical fiber length, and Tr is that signal shakes in the multimode photoelectricity
Swing the delay transmitted in device loop one week.
Typical case knot of the adjustable multimode optical-electronic oscillator of Free Spectral Range provided by the invention in multimode optical-electronic oscillator
On the basis of structure, Fourier mode-locking technique is introduced, by making the electric length period of change for adjusting time delay optical fiber and signal in light
The delay transmitted one week in electrical oscillator loop matches, and meets Fourier mode locking condition, realizes multimode optical-electronic oscillator
The Free Spectral Range cyclically-varying of the multimode signal of output.
In the present embodiment, the Free Spectral Range of multimode optical-electronic oscillator by the length of multimode optical-electronic oscillator loop with
And optical fibre refractivity determines, specific formula are as follows:
Wherein, n is optical fibre refractivity, and c is the light velocity in vacuum, and L is the length of multimode optical-electronic oscillator loop.
It can be seen from the above, the length of time delay optical fiber 3 can be adjusted to change by adjusting electricity when optical fibre refractivity n is constant
The length L of multimode optical-electronic oscillator loop realizes the freedom for quickly continuously adjusting the multimode signal of multimode optical-electronic oscillator generation
Spectral region.Wherein, each length L can correspond to a Free Spectral Range, therefore available any free spectrum model
The multimode signal enclosed.
In the present embodiment, in order to make the signal delay having the same in the loop of different frequency, multimode optoelectronic oscillation
The dispersion of device loop is zero.
In the present embodiment, intensity modulator 2 is used to modulate the optical signal of the sending of laser 1；Erbium-doped fiber amplifier 4 is used
It is amplified in the optical signal for adjusting time delay optical fiber 3 to transmit electricity；What photodetector 5 was used to transmit erbium-doped fiber amplifier 4
Optical signal is converted to electric signal；Electric amplifier 6 is for amplifying the electric signal that photodetector 5 transmits；Power splitter 7 is used for
The electric signal that photoamplifier 6 transmits is divided into two parts, a part is for exporting, and a part is for feeding back to intensity modulator
2。
The adjustable multimode optical-electronic oscillator of Free Spectral Range provided by the invention, by using erbium-doped fiber amplifier and
Electric amplifier is lost be greater than gain of the optical signal in optical-electronic oscillator loop, generates multimode signal, and pass through control electricity
The length period of change of time delay optical fiber is adjusted, realizes the Free Spectral Range period of the multimode signal of the output of multimode optical-electronic oscillator
Property variation, and by adjust electricity adjust time delay optical fiber length, change multimode optical-electronic oscillator loop length, obtain free light
The multimode signal that spectral limit can be adjusted with arbitrary continuation.
According to another aspect of the present invention, a kind of the more of the adjustable multimode optical-electronic oscillator of Free Spectral Range are provided
Mould signal generating method, as shown in Fig. 2, Fig. 2 is the adjustable multimode photoelectricity vibration of Free Spectral Range provided in an embodiment of the present invention
The multimode signal production method of device is swung, this method comprises:
Step S101, laser issue optical signal and are transmitted to intensity modulator.
Step S102 after intensity modulator carries out intensity modulated to optical signal, adjusts time delay optical fiber to send er-doped to by electricity
Fiber amplifier.
Wherein, it is the high q-factor microwave energy-storage element with optical nonlinearity that electricity, which adjusts time delay optical fiber, the length in line attachment
Continuously adjustable is spent, length is several centimeters to tens of kms, exports for stablizing, generates highly sensitive periodic waveform.
In the present embodiment, electricity adjusts the length period of change of time delay optical fiber and signal to pass in multimode optical-electronic oscillator loop
Defeated delay in one week matches, and meets Fourier mode locking condition:
NT=Tr
Wherein, n is positive integer, and T is the period of change that electricity adjusts time delay optical fiber length, and Tr is that signal shakes in the multimode photoelectricity
Swing the delay transmitted in device loop one week.
The multimode signal production method of the adjustable multimode optical-electronic oscillator of Free Spectral Range provided by the invention, by making
The delay that electricity adjusts the length period of change of time delay optical fiber and signal to transmit one week in optical-electronic oscillator loop matches, and meets Fu
In leaf domain mode locking condition, realize multimode optical-electronic oscillator output multimode signal Free Spectral Range cyclically-varying.
Step S103, erbium-doped fiber amplifier after the optical signal of intensity modulated amplifies, will be transmitted to photoelectricity spy
Survey device.
In the present embodiment, optical signal is amplified by erbium-doped fiber amplifier, realizes the gain to optical signal.
The optical signal of intensity modulated is converted to electric signal, is transmitted to electric amplifier by step S104, photodetector.
Step S105, electric amplifier amplify electric signal, export through power splitter, and feed back to the radio-frequency head of intensity modulator
Mouth forms loop.
In the present embodiment, also electric signal is amplified by electric amplifier, realizes the gain to electric signal.
Step S106, when the gain that the optical signal that laser issues generates in the loop is higher than the loss generated in loop
When, multimode optical-electronic oscillator is in starting of oscillation state, generates multimode signal.
Step S107 adjusts electricity and adjusts the length of time delay optical fiber to adjust the Free Spectral Range of multimode signal.
In the present embodiment, the Free Spectral Range and multimode optoelectronic oscillation for the multimode signal that multimode optical-electronic oscillator generates
The length of device loop is inversely proportional, and specific relationship is as shown in following formula:
Wherein, n is optical fibre refractivity, and c is the light velocity in vacuum, and L is the length of multimode optical-electronic oscillator loop.And multimode
The length L of optical-electronic oscillator loop adjusts the length of time delay optical fiber depending on electricity, therefore, in the case where optical fibre refractivity is constant,
The present invention can adjust the length of time delay optical fiber by adjusting electricity, to change the length L of multimode optical-electronic oscillator loop, realize quick
The effect of the Free Spectral Range of multimode signal is continuously adjusted, even if the Free Spectral Range of multimode signal is quickly continuously adjusted.
Wherein, each length L is to a Free Spectral Range, therefore the multimode letter of available any Free Spectral Range
Number.
In addition, the above-mentioned definition to each element and method be not limited in the various specific structures mentioned in embodiment,
Shape or mode, those skilled in the art can replace with simply being known to its structure, such as: only using in the optical path
Image intensifer or electric amplifier amplify signal, and the polarization state etc. of Polarization Controller control system is added.Also, institute
Attached attached drawing is to simplify and used as illustrating.Number of devices, shape and size shown in the drawings can according to actual conditions and
It modifies, and the configuration of device is likely more complexity.
It should be noted that ordinal number such as " first ", " second ", " third " etc. used in specification and claim
Word, to modify corresponding element, itself simultaneously unexpectedly contains and represents the element and have any ordinal number, does not also represent certain unitary
The sequence or the sequence in manufacturing method of part and another element, the use of those ordinal numbers are only used to make one with certain name
Element is able to that clear differentiation can be made with another element with identical name.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in protection of the invention
Within the scope of.
Claims (10)
1. a kind of adjustable multimode optical-electronic oscillator of Free Spectral Range characterized by comprising laser (1), intensity modulated
Device (2), electricity adjust time delay optical fiber (3), erbium-doped fiber amplifier (4), photodetector (5), electric amplifier (6) and power splitter
(7)；
The laser (1) connect with the intensity modulator (2), the intensity modulator (2), erbium-doped fiber amplifier (4),
Photodetector (5), electric amplifier (6) and power splitter (7) are sequentially connected from head to tail to form loop, and the electricity adjusts time delay optical fiber
(3) intensity modulator (2) and the erbium-doped fiber amplifier (4) are connected.
2. the adjustable multimode optical-electronic oscillator of Free Spectral Range according to claim 1, which is characterized in that the laser
Between device (1) and the intensity modulator (2) and between the erbium-doped fiber amplifier (4) and the photodetector (5)
Connected by optical fiber.
3. the adjustable multimode optical-electronic oscillator of Free Spectral Range according to claim 1, which is characterized in that the photoelectricity
Pass through cable connection between detector (5), electric amplifier (6), power splitter (7) and intensity modulator (2).
4. the adjustable multimode optical-electronic oscillator of Free Spectral Range according to claim 1, which is characterized in that the electricity is adjusted
Time delay optical fiber (3) is the high q-factor microwave energy-storage element with optical nonlinearity, the length continuously adjustable in line attachment,
Length is several centimeters to tens of kms；The electricity adjusts time delay optical fiber (3) for stablizing output, generates highly sensitive period wave
Shape.
5. the adjustable multimode optical-electronic oscillator of Free Spectral Range according to claim 4, which is characterized in that the electricity is adjusted
The length period of change of time delay optical fiber (3) transmits one week delay phase with signal in the multimode optical-electronic oscillator loop
Match, meet Fourier mode locking condition:
NT=Tr
Wherein, n is positive integer, and T is the period of change that electricity adjusts time delay optical fiber length, and Tr is signal in the multimode optical-electronic oscillator
Delay in one week is transmitted in loop.
6. the adjustable multimode optical-electronic oscillator of Free Spectral Range according to claim 1, which is characterized in that the multimode
The Free Spectral Range of optical-electronic oscillator determines by the length and optical fibre refractivity of the multimode optical-electronic oscillator loop, specifically
Formula are as follows:
Wherein, n is optical fibre refractivity, and c is the light velocity in vacuum, and L is the length of multimode optical-electronic oscillator loop.
7. the adjustable multimode optical-electronic oscillator of Free Spectral Range according to claim 6, which is characterized in that in the light
When fine refractive index n is constant, the length of time delay optical fiber (3) is adjusted by adjusting the electricity, changes the multimode optical-electronic oscillator loop
Length L, realize the Free Spectral Range for adjusting the multimode signal that the multimode optical-electronic oscillator generates.
8. the adjustable multimode optical-electronic oscillator of Free Spectral Range according to claim 1, which is characterized in that the multimode
The dispersion of optical-electronic oscillator loop is zero, so that the delay having the same in the loop of the signal of different frequency.
9. the adjustable multimode optical-electronic oscillator of Free Spectral Range according to claim 8, which is characterized in that the intensity
Modulator (2) is used to modulate the optical signal of the laser (1) sending；The erbium-doped fiber amplifier (4) is used for the electricity
The optical signal of time delay optical fiber (3) transmission is adjusted to amplify；The photodetector (5) is used for the erbium-doped fiber amplifier
(4) optical signal transmitted is converted to electric signal；The electric amplifier (6) is used for the telecommunications for transmitting the photodetector (5)
It number amplifies；The power splitter (7) is used to the electric signal that photoamplifier (6) are transmitted being divided into two parts, and a part is used for
Output, a part is for feeding back to intensity modulator (2).
10. a kind of using the adjustable multimode optical-electronic oscillator multimode of Free Spectral Range described in any one of claims 1 to 9
Signal generating method, which is characterized in that the described method includes:
Laser (1) issues optical signal and is transmitted to intensity modulator (2)；
After the intensity modulator (2) carries out intensity modulated to the optical signal, time delay optical fiber (3) are adjusted to send er-doped to by electricity
Fiber amplifier (4)；
The erbium-doped fiber amplifier (4) after the optical signal of intensity modulated amplifies, is transmitted to photodetection for described
Device (5)；
The amplified optical signal is converted to electric signal by the photodetector (5), is transmitted to electric amplifier (6)；
The electric amplifier (6) amplifies the electric signal, exports through power splitter (7), and feed back to penetrating for intensity modulator (2)
Frequency port forms loop；
When the gain that the optical signal that the laser (1) issues generates in the loop is higher than the loss generated in the loop
When, the multimode optical-electronic oscillator is in starting of oscillation state, generates multimode signal；
It adjusts the electricity and adjusts the length of time delay optical fiber (3) to adjust the Free Spectral Range of the multimode signal.
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| CN111834864A (en) * | 2020-07-07 | 2020-10-27 | 电子科技大学 | Phase modulation and optical filtering-based photoelectric oscillator |
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Application publication date: 20190517 |