CN202143068U - Fiber parameter oscillator chamber length real-time monitoring and compensation arrangement based on frequency sweep feedback mechanism - Google Patents
Fiber parameter oscillator chamber length real-time monitoring and compensation arrangement based on frequency sweep feedback mechanism Download PDFInfo
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- CN202143068U CN202143068U CN201120209195U CN201120209195U CN202143068U CN 202143068 U CN202143068 U CN 202143068U CN 201120209195 U CN201120209195 U CN 201120209195U CN 201120209195 U CN201120209195 U CN 201120209195U CN 202143068 U CN202143068 U CN 202143068U
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Abstract
Disclosed is a fiber parameter oscillator chamber length real-time monitoring and compensation arrangement based on frequency sweep feedback mechanism, comprising a light frequency sweep signal generation module (1), a fiber parameter oscillator (2), a photoelectric conversion module (3), and a power reception processing module (4), wherein the light frequency sweep signal generation module (1) and the photoelectric conversion module (3) are connected with the fiber parameter oscillator (2) respectively via the fiber; the signal output end of the power reception processing module (4) is connected with a delay line (5), with the delay line (5) being connected with the fiber parameter oscillator (2) via the fiber; and the photoelectric conversion module (3) and the power reception processing module (4) are electrically connected. The fiber parameter oscillator chamber length real-time monitoring and compensation arrangement of the utility model realizes the real-time monitoring and compensation over the fiber parameter oscillator chamber length, thereby overcoming the weakness of the conventional fiber parameter oscillator, i.e., the chamber length of the conventional fiber parameter oscillator is changed along the temperature change, which accordingly causes the modulation frequency of the output clock signal or the center wavelength to change along the temperature change.
Description
Technical field:
The utility model relates to fiber optic communication field, specifically is long monitoring and compensation arrangement in real time of a kind of Fiber-optic parametric oscillator chamber based on the frequency sweep feedback mechanism.
Background technology:
Along with the high speed development of optical communication technique in recent years, the information processing capability that ultrahigh speed intelligence optical communication network of future generation will have the Tbit/s magnitude.And the demand of high speed information handling property has stimulated the fast development based on the full optical device of fiber nonlinear effect.Utilize the response speed of highly nonlinear optical fiber third-order non-linear effect femtosecond, can realize the above complete light 3 R regenerator of 100Gb/s, low noise optical fiber parameter amplifier that the gain bandwidth scope reaches tens nanometer and the ultrashort light pulse generator of picosecond magnitude.Wherein, can realize multiple full optical information processing function and obtain broad research owing to the Fiber-optic parametric oscillator.Intensity modulator can realize active mode locking outside in the Fiber-optic parametric oscillator, utilizing, and the light impulse length of this mode locked fiber laser output only has several psecs, and the centre wavelength adjustable extent reaches tens nanometers.Through the injection locking mode, the Fiber-optic parametric oscillator can be accomplished full light time clock abstraction function, and the clock signal wavelength of extraction can also be realized continuously adjustable.The unique technology advantage of Fiber-optic parametric oscillator makes it in optical communication system of future generation, have wide application prospect.
Owing to use highly nonlinear optical fiber as nonlinear dielectric, the chamber of Fiber-optic parametric oscillator long (the annular total length of oscillator inner fiber) is generally all at tens meters even hundreds of rice.Even utilize semiconductor optical amplifier (SOA) to replace highly nonlinear optical fiber, the chamber of oscillator is long also can to reach several meters.This causes the Fiber-optic parametric oscillator to receive external shock, influence of temperature variation easily.It is more single to the method for Fiber-optic parametric oscillator stability influence to reduce external shock, usually all light paths are fixed on the oscillator, and oscillator inside also can adopt the plate washer with shock-absorbing function to reduce external interference.Simultaneously, temperature also can cause the living change of the chamber long hair of optical fiber oscillator, this meeting deterioration quality of output signals, even cause the oscillator losing lock.Overcome temperature at present and cause that the long method that changes in chamber mainly contains two kinds: regeneration mode-locking technique and dispersion shifted optical fiber compensation technique.Adopt the regeneration mode-locking technique to extract the frequency information with ring appearance coupling through follow-up electrical filter, this frequency information in the ring on the intensity modulator, and then is realized the automatic coupling of the long and locked mode frequency in Fiber-optic parametric oscillator chamber as radio frequency signal feedback.Cause the long problem that causes the oscillator losing lock that changes in chamber though this technology has solved temperature, the locked mode signal modulating frequency of output is changed with temperature, be unfavorable for providing modulating frequency stable clock signal.Adopt the dispersion shifted optical fiber compensation technique can the long variation in the chamber that temperature causes be converted into the optical clock signal center wavelength variation of extraction; Though this scheme has played the effect of stable output signal modulating frequency, the clock signal wavelength will be unfavorable for the application of this technology in wavelength-division multiplex system with temperature change.
The utility model content:
The technical problem that the utility model will solve is; Overcome traditional fiber parametric oscillator chamber personal attendant's variations in temperature; And then cause the modulating frequency or the temperature variant defective of centre wavelength of clock signal; Provide a kind of while can provide long coupling in chamber and chamber the long Fiber-optic parametric oscillator chamber based on the frequency sweep feedback mechanism long monitoring and the compensation arrangement in real time that compensates two functions, reduce the complexity of system.
The technical solution of the utility model is; Provide a kind of Fiber-optic parametric oscillator chamber long monitoring and compensation arrangement in real time; Comprise light swept-frequency signal generating module, Fiber-optic parametric oscillator, photoelectric conversion module and electric receiving processing module; Described smooth swept-frequency signal generating module is connected through optical fiber with the Fiber-optic parametric oscillator respectively with photoelectric conversion module; Electricity receiving processing module signal output part is connected with delay line, and described delay line is connected with the Fiber-optic parametric oscillator through optical fiber, and described photoelectric conversion module and electric receiving processing module are electrically connected.
Described smooth swept-frequency signal generating module comprises frequency sweep electric signal source, D/A conversion, electric low pass filter, intensity modulator and optical sender; The frequency sweep electric signal source is connected with the D/A convert electrical; The D/A conversion is electrically connected with electric low pass filter; The electricity low pass filter is electrically connected with intensity modulator, and optical sender is connected with intensity modulator optical fiber, and described intensity modulator is connected through optical fiber with the Fiber-optic parametric oscillator.
Described photoelectric conversion module comprises optical filter, photodiode, current/voltage amplifier and A/D conversion; Optical filter is connected by optical fiber with photodiode; Photodiode, current/voltage amplifier and A/D conversion are electrically connected successively, and described A/D conversion is electrically connected with electric receiving processing module.
The electricity receiving processing module comprises data collecting card and microprocessor controller, is electrically connected between described data collecting card and the microprocessor controller, and described data collecting card is electrically connected with photoelectric conversion module, and described microprocessor controller is electrically connected with delay line.
After adopting said structure; The utlity model has following advantage: the utility model utilizes the frequency response curve of frequency sweep modulation technique measuring optical fiber parametric oscillator; Judge the long variation in chamber through comparing the different differences of frequency response curves constantly, and then feed back to the long compensation in delay line realization chamber; Delay line in the Fiber-optic parametric oscillator has two functions simultaneously: Clock Extraction is set up and is regulated the long and input signal modulating frequency coupling in annular chamber chamber in the process, excites parametric oscillation to realize the Clock Extraction function; In Clock Extraction maintenance process; By the time of delay of feedback signal fine adjustment delay line; And then the annular chamber chamber that causes of compensation temperature is long changes, and increases clock stability, thereby realizes long monitoring in real time in Fiber-optic parametric oscillator chamber and compensation; Effectively overcome traditional fiber parametric oscillator chamber personal attendant's variations in temperature, and then caused the modulating frequency or the temperature variant defective of centre wavelength of clock signal.
Description of drawings:
Fig. 1 is the system block diagram of long monitoring in real time in the Fiber-optic parametric oscillator chamber based on the frequency sweep feedback mechanism of the utility model and compensation arrangement.
Fig. 2 is the long situation lower frequency of a Fiber-optic parametric oscillator different cavity response curve.
Fig. 3 causes that for temperature the frequency response of Fiber-optic parametric oscillator is moved and corresponding compensating delay time diagram.
Fig. 4 realizes the schematic diagram of frequency sweep electric signal source for look-up table.
Fig. 5 is cordic algorithm rotary course figure;
Shown in the figure: 1, light swept-frequency signal generating module, 2, the Fiber-optic parametric oscillator, 3, photoelectric conversion module, 4, electric receiving processing module, 5, delay line.
Embodiment:
Below in conjunction with accompanying drawing and embodiment the utility model is described further:
As shown in Figure 1; The Fiber-optic parametric oscillator chamber based on the frequency sweep feedback mechanism of the utility model long monitoring and compensation arrangement in real time; Comprise light swept-frequency signal generating module 1, Fiber-optic parametric oscillator 2, photoelectric conversion module 3 and electric receiving processing module 4; Described smooth swept-frequency signal generating module 1 and photoelectric conversion module 3 are connected through optical fiber with Fiber-optic parametric oscillator 2 respectively; Electricity receiving processing module 4 signal output parts are connected with delay line 5, and described delay line 5 is connected with Fiber-optic parametric oscillator 2 through optical fiber, and described photoelectric conversion module 3 is electrically connected with electric receiving processing module 4.
Described smooth swept-frequency signal generating module 1 comprises frequency sweep electric signal source, D/A conversion, electric low pass filter, intensity modulator and optical sender; The frequency sweep electric signal source is connected with the D/A convert electrical; The D/A conversion is electrically connected with electric low pass filter; The electricity low pass filter is electrically connected with intensity modulator, and optical sender is connected with intensity modulator optical fiber, and described intensity modulator is connected through optical fiber with the Fiber-optic parametric oscillator; The signal that light swept-frequency signal generating module is sent is the light signal that modulating frequency can change.Modulating frequency refers to and is input to the signal of telecommunication that the light that in the intensity modulator light source sent is modulated; Described frequency sweep electric signal source such as is at a step-length frequency sweep electric signal source.
Described photoelectric conversion module 3 comprises optical filter, photodiode, current/voltage amplifier and A/D conversion; Optical filter is connected by optical fiber with photodiode; Photodiode, current/voltage amplifier and A/D conversion are electrically connected successively, and described A/D conversion is electrically connected with electric receiving processing module.
Electricity receiving processing module 4 comprises data collecting card and microprocessor controller, is electrically connected between described data collecting card and the microprocessor controller, and described data collecting card is electrically connected with photoelectric conversion module, and described microprocessor controller is electrically connected with delay line.
Described delay line is the optical fiber by motor driven; Described motor can be connected with controller or computer-electrical; Through the control revolution; Thereby the length of the part of control optical fiber incoming fiber optic parametric oscillator, the error that lengthening or shortening optical fiber come the compensated fiber parametric oscillator to produce because of variations in temperature.
Operation principle is described below:
1. the measuring principle of Fiber-optic parametric oscillator frequency response curve:
The frequency response curve of Fiber-optic parametric oscillator and Fabry-Perot (FP) comb filter is similar, has only when modulating frequency and the long coupling in chamber to obtain Clock Extraction effect preferably, and maximum light transmission.Therefore through modulation different frequency R on the test light wavelength
bThe signal of telecommunication, just can obtain the pairing transmitted optical power curve of modulating frequency, and then realize the measurement of Fiber-optic parametric oscillator frequency response curve.Frequency response curve so that Fiber-optic parametric oscillator theoretical model calculates under the long L situation of different cavity is as shown in Figure 2.Can find out that from simulation result frequency response curve is moved to the left along with the long L in chamber becomes greatly gradually.Therefore can judge that chamber length is increase or reduces through the frequency response curve moving direction of detection fiber parametric oscillator.The chamber of simultaneously, calculating needs compensation according to the curve amount of movement is grown up little.This has just realized long precise monitoring and the compensation that changes in Fiber-optic parametric oscillator chamber.
2. the long compensation principle in the chamber of delay line:
Why the present invention utilizes delay line to realize that the long fine compensation in Fiber-optic parametric oscillator chamber is because it has following two characteristics: 1. length is that hundreds of meters Fiber-optic parametric oscillator is not carrying out under the long stable situation in any chamber; The stable output result that still can keep the several seconds; Therefore the long compensation scheme in chamber of Fiber-optic parametric oscillator does not need high-speed feedback loop, and the response time of commercial delay line is satisfied above situation fully; 2. temperature causes silica-based optical fibers length variations Δ L
0=(δ n/ δ T) L
f=1.1 * 10
-5L
f(m/ ℃), wherein L
fBe length of fiber, and the commercial delay line degree of regulation being 0.02ps, can be that 500 meters Fiber-optic parametric oscillator is realized about 0.001 ℃ temperature-compensating, practical requirement to chamber length.Be example with 500 meters Fiber-optic parametric oscillators below, as shown in Figure 3, calculate temperature and cause that the chamber is long and change that the frequency response curve that causes moves and the corresponding compensating delay time.Cause the corresponding frequency change Δ R of maximum power value in the frequency response curve with different temperatures
bAs feedback signal, can pass through Δ R
bThe positive and negative time of delay of confirming to be used to compensate increase or dwindle, and Δ R
bThen present one-to-one relationship the time of delay with compensation.The long compensation scheme in chamber that can find out delay line from simulation result is feasible.
3. frequency sweep electric signal source occurring principle:
The present invention need use the frequency response curve of frequency sweep detectable signal measuring optical fiber parametric oscillator, so the frequency sweep electric signal source is to realize one of key factor of the present invention.The frequency sweep electric signal source can adopt look-up table or cordic algorithm exploitation to obtain by field programmable gate array (FPGA); Perhaps adopt DDS chip, voltage controlled oscillator (VCO) to accomplish.Two kinds of algorithm principle are distinguished as follows:
(1) look-up table: Fig. 4 is the basic principle block diagram of look-up table, and phase accumulator is made up of adder and register cascade, at clock pulse f
ClkControl under, the phase result addition that adder adds up the last time of frequency control word K and register output is to obtain the result that this adds up.This result delivers to the data input pin of register.Register feeds back to the input of adder so that adder continues and the frequency control word addition with this result on the one hand under the effect of next clock pulse, again this accumulated value is sent into waveform ROM storage list as the phase bit address on the other hand.According to the amplitude data of this phase place address value output respective waveforms, after D/A converter becomes needed analog waveform with low pass filter with the waveforms amplitude data transaction.Low pass filter is used for filtering unwanted frequency component so that obtain the pure waveform of output spectrum.
(2) cordic algorithm: the rotary course of cordic algorithm can be explained with Fig. 5, start vector among the figure
Coordinate be (x
0, y
0), the object vector of rotation
Coordinate be (x
m, y
m), vector
With vector
Between angle be z
0, have digital arrow and indicate current rotation back vector
The new vector position that is arrived, on the arrow shown in numeral the i time rotation, the value of i is i=0,1 ..., m-1 (expression vector
Arrive vector
Needed total number of revolutions).According to the cordic algorithm principle, write out the cordic algorithm interative computation and do
More than two kinds of algorithms all can realize and draw that the frequency sweep signal of telecommunication that frequency can change is as the frequency sweep electric signal source by the FPGA programming.
Fiber-optic parametric oscillator frequency response curve can be monitored in real time and compensated cavity is long changes through comparing, and obtains the stable clock extraction effect.Embodiment is following:
The frequency sweep electric signal source produces the signal of telecommunication of step change such as modulating frequency.The frequency sweep electric signal source can adopt look-up table or cordic algorithm exploitation to obtain by field programmable gate array (FPGA), but D/A conversion of frequency sweep signal of telecommunication process and electric low pass filter are to obtain the analog signal of frequency step-size change.Obtain the swept-frequency signal of different frequency by these two kinds of methods, its minimum step frequency is f
Min=f
Clk/ 2
N, f wherein
ClkBe maximum clock frequency, commercial at present FPGA can reach more than the 300MHz, and N is the figure place of phase accumulator, and be 1 clock cycle change-over time, is l/f
ClkThe treated frequency sweep signal of telecommunication is modulated on the light carrier of light source generation by intensity modulator, and then obtains the light swept-frequency signal.The light swept-frequency signal is as test light signal injection fibre parametric oscillator, to measure frequency response curve.
The test light signal gets into the process that the Fiber-optic parametric oscillator carries out Clock Extraction.Because the Fiber-optic parametric oscillator only can be accomplished high-quality Clock Extraction process under ring length and input signal modulating frequency match condition.Therefore the test light signal of different modulating frequency will obtain different Clock Extraction results.The test light signal of modulating frequency Satisfying Matching Conditions can obtain best clock signal, and its luminous power is also the highest.Along with the intensification of modulating frequency with the long mismatch degree of ring, the clock signal quality of extraction is variation gradually, and its power also further reduces.Therefore can obtain the clock signal luminous power information that the different modulating frequency is extracted at the Fiber-optic parametric oscillator output end.
The clock light signal of parametric oscillator output gets into photoelectric conversion module.At first by optical filter filtering out-of-band noise, to improve the accuracy that luminous power detects.Photodiode is used for opto-electronic conversion, converts light signal into current information.Since the electric current after the opto-electronic conversion a little less than, therefore needing the current/voltage amplifier is voltage with current conversion, and suitable amplifying voltage value, is beneficial to the data acquisition in later stage.The A/D conversion realizes the conversion of analog signal to digital signal, and the digital signal after the conversion is injected into electric receiving processing module.
Data collecting card is used to gather the digital information of injection.Because the signal that receives is a clock signal; Need to remove noise through low-pass digital filter; Commercial at present capture card is the function of integrated digital filtering mostly; Can adopt cut-off frequency acquired signal to be carried out filtering, finally obtain the received optical power corresponding voltage value at the 20 rank Butterworth filters of 0.5Hz.And modulating frequency and voltage relationship are the frequency response curve of Fiber-optic parametric oscillator, and microprocessor controller is advanced in preservation, and compare with last group of data.Judge the variation that the chamber is long according to moving of frequency response curve.Relation time delay that moves and compensate based on frequency response curve is input to feedback information on the delay line in the Fiber-optic parametric oscillator simultaneously, and this has just accomplished single pass and feedback procedure.Through real-time repetition said process, just can increase the clock signal retention time that the Fiber-optic parametric oscillator extracts.
Below only be described, but can not be interpreted as it is restriction claim with regard to the utility model preferred embodiment.The utility model not only is confined to above embodiment, and its concrete structure allows variation.In a word, all various variations of in the protection range of the utility model independent claims, being done are all in the protection range at the utility model.
Claims (4)
1. the Fiber-optic parametric oscillator chamber length based on the frequency sweep feedback mechanism is monitored and compensation arrangement in real time; It is characterized in that: comprise light swept-frequency signal generating module (1), Fiber-optic parametric oscillator (2), photoelectric conversion module (3) and electric receiving processing module (4); Described smooth swept-frequency signal generating module (1) is connected through optical fiber with Fiber-optic parametric oscillator (2) respectively with photoelectric conversion module (3); Electricity receiving processing module (4) signal output part is connected with delay line (5); Described delay line (1) is crossed optical fiber and is connected with Fiber-optic parametric oscillator (2), and described photoelectric conversion module (3) and electric receiving processing module (4) are electrically connected.
2. the Fiber-optic parametric oscillator chamber based on the frequency sweep feedback mechanism according to claim 1 long monitoring and compensation arrangement in real time; It is characterized in that: described smooth swept-frequency signal generating module (1) comprises frequency sweep electric signal source, D/A conversion, electric low pass filter, intensity modulator and optical sender; The frequency sweep electric signal source is connected with the D/A convert electrical; The D/A conversion is electrically connected with electric low pass filter; The electricity low pass filter is electrically connected with intensity modulator, and optical sender is connected with intensity modulator optical fiber, and described intensity modulator is connected through optical fiber with the Fiber-optic parametric oscillator.
3. the Fiber-optic parametric oscillator chamber based on the frequency sweep feedback mechanism according to claim 1 long monitoring and compensation arrangement in real time; It is characterized in that: described photoelectric conversion module (3) comprises optical filter, photodiode, current/voltage amplifier and A/D conversion; Optical filter is connected by optical fiber with photodiode; Photodiode, current/voltage amplifier and A/D conversion are electrically connected successively, and described A/D conversion is electrically connected with electric receiving processing module.
4. the Fiber-optic parametric oscillator chamber based on the frequency sweep feedback mechanism according to claim 1 long monitoring and compensation arrangement in real time; It is characterized in that: electric receiving processing module (4) comprises data collecting card and microprocessor controller; Be electrically connected between described data collecting card and the microprocessor controller; Described data collecting card is electrically connected with photoelectric conversion module, and described microprocessor controller is electrically connected with delay line.
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| CN201120209195U CN202143068U (en) | 2011-06-21 | 2011-06-21 | Fiber parameter oscillator chamber length real-time monitoring and compensation arrangement based on frequency sweep feedback mechanism |
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| CN201120209195U CN202143068U (en) | 2011-06-21 | 2011-06-21 | Fiber parameter oscillator chamber length real-time monitoring and compensation arrangement based on frequency sweep feedback mechanism |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182105A (en) * | 2015-07-27 | 2015-12-23 | 电子科技大学 | Automatic testing device for electric control characteristic of microannulus chip |
| CN113839297A (en) * | 2021-09-08 | 2021-12-24 | 电子科技大学 | Photoelectric oscillator based on injection locking effect |
-
2011
- 2011-06-21 CN CN201120209195U patent/CN202143068U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182105A (en) * | 2015-07-27 | 2015-12-23 | 电子科技大学 | Automatic testing device for electric control characteristic of microannulus chip |
| CN113839297A (en) * | 2021-09-08 | 2021-12-24 | 电子科技大学 | Photoelectric oscillator based on injection locking effect |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120208 Termination date: 20150621 |
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