CN202648797U - Optical frequency domain vernier method spectrometer - Google Patents
Optical frequency domain vernier method spectrometer Download PDFInfo
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- CN202648797U CN202648797U CN 201220093509 CN201220093509U CN202648797U CN 202648797 U CN202648797 U CN 202648797U CN 201220093509 CN201220093509 CN 201220093509 CN 201220093509 U CN201220093509 U CN 201220093509U CN 202648797 U CN202648797 U CN 202648797U
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Abstract
The utility model discloses an optical frequency domain vernier method spectrometer. The spectrometer comprises an incident collimating lens, a tunable F-P interferometer, an F-P etalon, a first fiber circulator, a second fiber circulator, a first photoelectric detection apparatus, a power measurement module, a second photoelectric detection apparatus and a wavelength demodulation module, wherein the incident collimating lens is used to couple incident light to be measured into an optical fiber; a light wave from the incident collimating lens passes through the tunable F-P interferometer through tuning a cavity length on a selection portion; the F-P etalon is used to extract the light wave with a specific frequency from the tunable F-P interferometer; the first fiber circulator is used to isolate reflected light and is located between the tunable F-P interferometer and the etalon; the light wave is transmitted between a second fiber circulator input port and the F-P etalon. According to the utility model, a michelson interferometer with a large size and a grating-image sensor structure are avoided to be used and optical frequency selection is realized. The cavity length of a resonant cavity can be tuned in a small amplitude so that a technical problem generated through using a movable part is avoided.
Description
Technical field
The utility model relates to a kind of optical frequency territory vernier method spectrometer, belongs to the spectrographic detection field, can be applied to the fields such as mensuration, optical communication and Fibre Optical Sensor of the absorption spectrum of material.
Background technology
The prior art of measuring spectrum mainly contains two classes at present.One class is that the different wave length ripple is distributed on the different direction in spaces, and wherein common beam splitter is prism and grating.Another kind of is that the different wave length ripple is separated in time, and wherein Fourier transform spectrometer, commonly can utilize Michelson interferometer or Mach-Zehnder interferometer to realize.
One of technology formerly, utilize grating that the different wave length ripple is distributed to different direction in spaces, utilize linear detector array or linear image sensor (such as CCD or cmos image sensor) to survey the power of different wave length light wave, obtain thus spectrum to be measured.The advantage of this method is: fast response time, wavelength resolution also can be very high.Shortcoming mainly is to need larger distance between detector and the grating, thereby causes the machining difficulty, the huge heaviness of equipment, and also expensive.
Formerly two of technology, light wave is imported a Michelson-or Mach-Zehnder interferometer, the light wave of output is the coherent light of the light wave that transmits in two arms, its power is the function of wavelength and phase differential.By regulating the length of a light arm, change phase differential, can obtain luminous power with the long variation in chamber.And the relation of spectrum and this signal just in time is the cosine Fourier transform, therefore, by finding the solution inverse Fourier transform, can obtain spectrum to be measured.The advantage of this method is that spectrographic detection scope and wavelength resolution are all very high.Shortcoming is: expend time in very much, can not measure and change faster spectrum; Have moving component, also very high to the requirement of machining; Equipment is also huge and expensive.Therefore how to overcome above-mentioned technical matters in the prior art, become the direction that those of ordinary skills make great efforts.
The utility model content
The utility model purpose provides a kind of optical frequency territory vernier method spectrometer, has avoided using larger Michelson interferometer and the grating-image sensor architecture of volume, and has realized the light frequency selection; And can be on very little amplitude the chamber of tuned resonating cavity long, avoided the technical matters that adopts movable part to produce.
For achieving the above object, the technical solution adopted in the utility model is: a kind of optical frequency territory vernier method spectrometer comprises:
The incident collimation lens is used for incident light to be measured is coupled into optical fiber;
Tunable F-P interferometer, it divides the light wave from described incident collimation lens to pass through by the long selection portion in tuning its chamber;
The F-P etalon is used for extracting the light wave from described tunable F-P interferometer characteristic frequency;
Be used for isolating catoptrical the first fiber optical circulator, between tunable F-P interferometer and F-P etalon, be used for receiving the light wave from tunable F-P interferometer;
The second fiber optical circulator transmits light wave between this second fiber optical circulator input port and the described F-P etalon;
The first Electro-Optical Sensor Set is connected to described the second fiber optical circulator the first output port, is used for light wave is converted into electric signal;
Power measurement module is calculated luminous power according to the electric signal from the first Electro-Optical Sensor Set, and sampling also stores the luminous power data;
The second Electro-Optical Sensor Set is connected to described the second fiber optical circulator the second output port, is used for light wave is converted into electric signal;
The Wavelength demodulation module, according to the luminous power of calculating from the electric signal of the second Electro-Optical Sensor Set after light wave that stabilized light sends passes whole system, the luminous power data are also preserved in sampling, and demodulation obtains wavelength data from the luminous power data.
Further improved technical scheme is as follows in the technique scheme:
As preferably, two end mirrors have different reflectivity at different wavelength in the described tunable F-P interferometer.
As preferably, also comprise: stabilized light, receive the light wave from the 3rd port transmission in described the first fiber optical circulator, the frequency stabilization benchmark light wave that this stabilized light sends is coupled into optical fiber through coupling mechanism with from the light wave of incident collimation lens;
The light wave that the first fiber coupler, stabilized light send is superimposed through coupling mechanism and light wave to be measured, and together passes through interferometer;
Fiber Bragg Grating FBG, between described the second fiber optical circulator and the first Electro-Optical Sensor Set, the light wave reflection that will send from stabilized light, the frequency range of its stopband and light wave to be measured staggers.
As preferably, also comprise: stabilized light is used for providing a frequency stabilization benchmark light wave;
The 3rd fiber optical circulator, its 1st port receive described frequency stabilization benchmark light wave, the 3rd fiber optical circulator the 2nd port and described F-P etalon transmission light wave, the 3rd fiber optical circulator the 3rd port and described the second fiber optical circulator the 1st port transmission light wave;
Fiber Bragg Grating FBG, between described the second fiber optical circulator and Electro-Optical Sensor Set, the light wave reflection that will send from stabilized light, the frequency range of its stopband and light wave to be measured staggers.
As preferably, also comprise: stabilized light is used for providing a frequency stabilization benchmark light wave;
The second fiber coupler, being used for the wavelength-division of frequency stabilization reference light is two-way;
The light wave that the first fiber coupler, stabilized light send is superimposed through the first fiber coupler and light wave to be measured, and together passes through interferometer;
The 3rd fiber optical circulator, its the 1st port receives the frequency stabilization benchmark light wave from the second fiber coupler, the 3rd fiber optical circulator the 2nd port and described F-P etalon transmission light wave, the 3rd fiber optical circulator the 3rd port and described the second fiber optical circulator the 1st port transmission light wave;
The first Electro-Optical Sensor Set is connected to described the second fiber optical circulator the first output port, is used for light wave is converted into electric signal;
The second Electro-Optical Sensor Set is connected to described the second fiber optical circulator the second output port, is used for light wave is converted into electric signal;
Fiber Bragg Grating FBG, between described the second fiber optical circulator and Electro-Optical Sensor Set, the light wave reflection that will send from stabilized light, the frequency range of its stopband and light wave to be measured staggers.
As preferably, the light frequency of described stabilized light and the scope of spectrum to be measured stagger.
Because technique scheme is used, the utility model compared with prior art has following advantages and effect:
1, the utility model utilizes two very little resonator cavitys of volume to realize the function that light frequency is selected, avoided using the larger Michelson interferometer of volume, or the free-space propagation distance of growing in grating-image sensor architecture.
2, the utility model only needs a photodetector, has avoided using the imageing sensor of expensive Instrument Level.
3, the utility model only need to be on very little amplitude in the process of scan light frequency the chamber of tuned resonating cavity long.Therefore can adopt the means such as electrooptical modulation, avoid the problem that adopts movable part to cause.
4, spectral resolution of the present utility model is determined by the Free Spectral Range of etalon, can reach at an easy rate high resolving accuracy.
Description of drawings
Fig. 1 structure of the present utility model;
The power transmission spectrum of Fig. 2 resonator cavity;
The power transmission spectrum of Fig. 3 etalon 7 and interferometer 3;
Fig. 4 realizes frequency sweeping by tuning interferometer 3;
Fig. 5 interferometer 3 is at end face reflection rate and the power transmission spectrum of different-waveband;
The amplitude modulation(PAM) that 3 pairs of wavelength-modulated light waves of Fig. 6 etalon 7 and interferometer apply;
The voltage signal of Fig. 7 tuned resonance cavity length.
In the above accompanying drawing: 1, incident collimation lens; 2, the first fiber coupler; 3, tunable F-P interferometer; 4, the first fiber optical circulator; 5, stabilized light; 6, the second fiber coupler; 7, F-P etalon; 8, the 3rd fiber optical circulator; 9, the second fiber optical circulator; 10, Fiber Bragg Grating FBG; 11, the first Electro-Optical Sensor Set; 12, the second Electro-Optical Sensor Set; 13, power measurement module; 14, Wavelength demodulation module.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described:
Embodiment: a kind of optical frequency territory vernier method spectrometer,, as shown in Figure 1, successively by incident collimation lens 1, the first fiber coupler 2, tunable F-P interferometer 3, fiber optical circulator 4, stabilized light 5, the second fiber couplers 6, F-P etalon 7, fiber optical circulator 8, fiber optical circulator 9, Fiber Bragg Grating FBG (FBG) 10, the first Electro-Optical Sensor Sets 11, Electro-Optical Sensor Set 12, power measurement module 13, Wavelength demodulation module 14 consists of.Its structure as shown in Figure 1.The function of each composition characteristic and concrete working method are seen the narration of technical scheme part.
According to the knowledge of multiple-beam interference, the power transmission spectrum of resonator cavity presents pectination, as shown in Figure 2.Wherein the light path in Free Spectral Range (chamber longitudinal mode spacing) and the resonator cavity (long referred to as the chamber) is inversely proportional to.The width of chamber longitudinal mode, namely the width of transmitted spectrum is determined by fineness.Fineness is higher, and the shape of longitudinal mode is more sharp-pointed, and the longitudinal mode width D is narrower.
Have the resonator cavity of two serial connections in the utility model, i.e. the long variable F-P interferometer 3 in chamber and the long fixing F-P interferometer 7 in chamber.Both Free Spectral Ranges have a small difference, and as shown in Figure 3, Fig. 3 (a) is the transmission spectrum of F-P etalon, and Fig. 3 (b) is the transmission spectrum of tunable F-P interferometer, and both transmitted spectrums are at light frequency v
iThe place overlaps, and does not overlap at other any wavelength, and therefore, light wave to be measured passes after two resonator cavitys, and only remaining frequency is v
iMonochromatic optical wave.
According to the relevant knowledge of resonator cavity, its longitudinal mode frequency is
Wherein C is the light velocity, and L is light path in the chamber, and n is a positive integer, is the sequence number of longitudinal mode.
Can obtain the Free Spectral Range of resonator cavity from formula (1), namely the difference on the frequency of adjacent longitudinal mode is
Can find out from formula (1) and formula (2), when changing the long L in chamber, the light frequency v at Free Spectral Range and n longitudinal mode place can change.But, long much smaller than the chamber such as the change amount Δ L that fruit caving is long, namely have relationship delta L＜＜L, can find out from formula (2), some subtle change on the denominator can not produce significantly Free Spectral Range Δ v be affected, we can think that Δ v is constant.On the other hand, at the optical frequency wave band, the ordinal number n of chamber longitudinal mode is very large.Therefore, some subtle change of Free Spectral Range (longitudinal mode spacing) all can add up, and make the light frequency at n longitudinal mode place produce significant the variation.In sum, the effect of the fine setting long L in chamber just is equivalent to the transmitted spectrum of translation resonator cavity, as shown in Figure 4.For the ease of difference, the position of the transmitted spectrum of interferometer 3 some have been moved down slightly among the figure.
As shown in Figure 4, wherein: V1: sampled light frequency 1, V2: sampled light frequency 2, V3: sampled light frequency 3, V4: sampled light frequency 4, V5: the spectrum of tunable F-P interferometer, the spectrum of V6:F-P etalon, d1: the skew of longitudinal mode, d2: the skew of sampled light frequency; Among Fig. 4 (a), when n longitudinal mode of m longitudinal mode of etalon 7 spectrum and interferometer 3 spectrum coincided, sampled light frequency 1 can be passed through; Among Fig. 4 (b), m+1 longitudinal mode and n+1 longitudinal mode coincide, and sampled light frequency 2 can be passed through; Among Fig. 4 (c), m+2 longitudinal mode and n+2 longitudinal mode coincide, and sampled light frequency 3 can be passed through; Among Fig. 4 (d), m+3 longitudinal mode and n+3 longitudinal mode coincide, and sampled light frequency 4 can be passed through.
We can find out from Fig. 4, the frequency of n the longitudinal mode very little value that only drifted about, and the sampled light frequency of system has just been crossed over very large scope.These characteristics have determined very little of the long tuning value in the needed chamber of the utility model, thereby can adopt the technology such as electrooptical modulation, have avoided the use movable part.
Technical scheme as shown in Figure 1.
Incident light to be measured is coupled into optical fiber by collimation lens 1; Through coupling mechanism 2, enter interferometer 3; Interferometer 3 is optical filters of a pectination, and its transmitted spectrum as shown in Figure 2.In the incident light wave to be measured, the light wave that only has the longitudinal mode of those frequencies and interferometer 3 to coincide can pass through.
The light wave of interferometer 3 outputs enters circulator 4.So-called circulator is that a kind of its function is: the light wave of 1 port incident is exported from 2 ports at optical communication and sensory field passive device commonly used, and the light wave of 2 port incidents is exported from 3 ports, and the light wave of 3 port incidents is no-output then.(subordinate)
Light wave enters 1 port of circulator 4, from the output of 2 ports, Engage of standard tool 7.The purpose of inserting circulator 4 between interferometer 3 and etalon 7 is in order to isolate reflected light.
Etalon 7 also is the optical filter of a pectination, its transmitted spectrum such as Fig. 2, shown in Figure 3.From the explanation of Fig. 3, Fig. 4 and preamble as can be known, pass in several light frequency compositions of interferometer 3, only have at most one can pass etalon 7.
From the explanation of Fig. 3, Fig. 4 and preamble as can be known, long by the chamber of tuning interferometer 3, can select artificially finally to pass the frequency of the light wave of etalon 7.That is to say, can from light wave to be measured, select a monochromatic optical wave.This function is the basis of realizing spectral measurement.
Enter 2 ports of circulator 8 from the monochromatic optical wave of etalon 7 outgoing, from 3 port outgoing; Enter 1 port of circulator 9, from 2 port outgoing, enter FBG 10.FBG10 is an optical bandstop filter.In the utility model, the stopband of FBG10 and the frequency range of light wave to be measured stagger, and can not treat in the photometry spectrum any one frequency content and have an effect.
Light wave passes after the FBG10, is changed into electric signal by photodetector 11, ingoing power measurement module 13.Acting as of power measurement module 13: calculate luminous power from electric signal; Sampling also stores the luminous power data.
In the utility model, the chamber length of interferometer 3 is by tuning continuously, and its transmitted spectrum is also mobile continuously.From the explanation of Fig. 3, Fig. 4 and preamble as can be known, in a tuning cycle, frequency contents different in the light wave to be measured are passed system in the different time, by power measurement module 13 measured and records.So, include the power information of different wave length ripple in the data that power measurement module obtains.
For a spectrometric instrument, be inadequate with the monochromatic optical wave separating and measuring in the spectrum to be measured just only, also must be able to judge the frequency of current measured light wave.See intuitively, can calculate by the chamber length of stellar interferometer 3 light frequency of the current light wave that passes through.But, because the variable quantity of chamber length is very little, can not obtain enough accurate measurements, so the utility model provides a stabilized light 5 as the means of judging current sampled light frequency.
The frequency stabilization mechanism that stabilized light 5 adopts is PDH (Pound-Drever-Hall) method.In the PDH frequency-stabilizing method, must adopt a longitudinal mode of etalon as the frequency stabilization benchmark.
In the utility model, adopt certain longitudinal mode of etalon 7 as the frequency stabilization benchmark of stabilized light 5.Strictly speaking, etalon 7 and stabilized light 5 are combined with and just consist of a complete stabilized light.But in the utility model, etalon 7 also has other function (with the interferometer 3 common frequency selection functions that realize), so so-called stabilized light 5 in the utility model refers to remove in the complete stabilized light afterwards remaining part of etalon.
In addition, the so-called frequency stabilization light wave of PDH method output is actually a light wave of doing wavelength-modulated with very little amplitude.
The light wave that stabilized light 5 sends is through coupling mechanism 6, and a part of luminous power is distributed to coupling mechanism 2, is used for judging the spectral shift amount of interferometer 3, and another part luminous power is distributed to the frequency stabilization backfeed loop.This loop comprises circulator 8, etalon 7, circulator 4.Light wave enters from 1 port of circulator 8, the output of 2 ports, and then the Engage of standard tool 7, and the light wave that passes etalon 7 enters 2 ports of circulator 4, from the output of 3 ports, feeds back to stabilized light 5, and the error signal of frequency stabilization is provided.
The demodulation that utilizes stabilized light 5 to realize interferometer 3 transmission spectrum translational movements in the utility model.Its course of work is: the light wave that stabilized light 5 sends is superimposed through coupling mechanism 2 and light wave to be measured, and together by interferometer 3, enter 1 port of circulator 4, from the output of 2 ports, pass etalon 7, enter 2 ports of circulator 8, export from 3 ports, enter 1 port of circulator 9, from the output of 2 ports, arrive FBG10.FBG10 is a band resistance optical filter, allows light wave to be measured pass through, the light wave reflection that stabilized light 5 is sent.Enter 2 ports of circulator 9 after stabilized light 5 is reflected by FBG10, from the output of 3 ports, be converted into electric signal by photodetection circuit 12, last input wavelength demodulation module 14.Acting as of Wavelength demodulation module 14: calculate luminous power after light wave that stabilized light 5 sends passes whole system from electric signal; Sampling is also preserved the luminous power data; Demodulation obtains wavelength data from the luminous power data.The principle of demodulation is described below.
Because the frequency of stabilized light 5 is stable, if the transmission spectrum generation translation of interferometer 3, this light wave is certain to produce corresponding variation after passing interferometer 3 so.By resolving this variation, can learn in theory the spectral shift amount of interferometer 3.But, consider that the fineness of interferometer 3 is very high, the shape of spectrum is very sharp-pointed, in the process of spectral shift, when the wavelength of stabilized light 5 is not aimed at certain longitudinal mode, does not almost have luminous power can pass interferometer 3, has increased a lot of difficulties to detection.
In order to allow stabilized light 5 after passing interferometer 3, can also keep more luminous power, must reduce the fineness of interferometer 3, make its transmitted spectrum become more smooth.Yet in order to realize the frequency selection function, interferometer 3 needs again very high fineness.So, select light frequency and the spectral range to be measured of stabilized light 5 to stagger, corresponding, interferometer 3 has higher fineness in spectral range to be measured, and near the wave band stabilized light 5 has lower fineness.In order to achieve this end, two end mirrors of interferometer 3 have different reflectivity at different wavelength, as shown in Figure 5:
Fig. 5 (a) is the reflectivity of the end mirror of interferometer 3, R
1Be the reflectivity of spectral measurement ranges, be in close proximity to 1, R
2It is the reflectivity of stabilized light place wave band; Fig. 5 (b) is the corresponding resonator cavity power of the different reflectivity transmission spectrum of different-waveband; Fig. 5 (c) is the spectrum of stabilized light 5.Should note the light wave that is actually a wavelength-modulated that stabilized light 5 is exported, its modulation amplitude approximates the longitudinal mode width D of etalon 7.In Fig. 5 and since the range spans of drawing a lot of Free Spectral Ranges, so the spectrum of stabilized light 5 is plotted as a fixing narrow spectrum.
Demodulate by stabilized light 5 interferometer 3 transmission spectrum translational movement method as shown in Figure 6.
Fig. 6 (a) is that longitudinal mode that is used for the light source frequency stabilization in the transmitted spectrum of etalon 7; Fig. 6 (b) is that the light wave of the wavelength Sine Modulated sent of stabilized light 5 is by suffered amplitude modulation(PAM) behind this longitudinal mode; Fig. 6 (c) is the transmitted spectrum of the antiradar reflectivity wave band of interferometer 3, and wherein solid line, dotted line, dot-and-dash line represent respectively three different transmission spectrums of translational movement; Fig. 6 (d) is the amplitude modulation(PAM) of light wave by being subject to after the interferometer 3 of wavelength Sine Modulated; Fig. 6 (e) is the light wave of wavelength Sine Modulated.
As mentioned before, the utility model makes the transmitted spectrum generation translation of interferometer 3 by the chamber length of tuning interferometer 3.When the sharp-pointed transmission spectrum generation translation of high reflectance wave band, the mild transmission spectrum of antiradar reflectivity wave band also can the identical value of translation.So, the translation of measuring antiradar reflectivity wave band transmission spectrum, the spectral components that just can instead release which frequency can pass interferometer 3 and etalon 7.
In the utility model, the light wave of a wavelength-modulated of stabilized light 5 outputs.So-called wavelength-modulated refers to that the light frequency of light wave changes according to certain rule in time, such as modal sinusoidal form.When the light wave of wavelength-modulated passed an optical filter, the transmitted spectrum of the filtered device of meeting applied an amplitude modulation(PAM).This is because when light source is modulated to certain wavelength, just in time aim at the larger point of transmitance in the transmitted spectrum, and when being modulated onto another wavelength, aim at the less point of transmitance in the transmitted spectrum.So in the cycle, the luminous power of passing transmission spectrum also can back and forth change one time a wavelength-modulated, final effect has applied again an amplitude modulation(PAM) to Wavelength modulation spectroscopy exactly.Oscillating curve among the Fig. 6 (b) that produces referring to the longitudinal mode Curves of the sinusoidal curve projection among Fig. 6 (e) in Fig. 6 (a).
It can also be seen that from Fig. 6, the waveform of the amplitude modulation(PAM) that transmitted spectrum applies is along with light source is different from the relative position of transmitted spectrum and change.In fact simple, in the larger place of transmitted spectrum slope ratio, the amplitude modulation(PAM) that applies is just larger, and vice versa.Three different curves of cyclical fluctuations among the Fig. 6 (b) that produces respectively to three transmission spectrum Curves among Fig. 6 (c) such as the sinusoidal curve projection among Fig. 6 (e).
From Fig. 6 (c), (d), (e) can find out, antiradar reflectivity wave band at interferometer 3, (only drawn transmitted spectrum among the figure and be in three different positions, in order to represent translation) when the transmitted spectrum translation, the wavelength-modulated light wave that stabilized light 5 sends has been aimed at the diverse location of transmitted spectrum, the phase place of the am signals of output, amplitude, frequency content all can be different, can be finally inversed by very much the spectral shift amount of resonator cavity from these information.
The frequency stabilization light wave also will pass through etalon 7 through after the interferometer 3, also can be subject to the modulation of etalon 7 again, such as Fig. 6 (a), (b), (e) shown in.According to theoretical analysis as can be known, the light wave of wavelength-modulated passes the total amplitude modulation(PAM) that is subject to after two resonator cavitys and is equivalent to their the separately product of effect.Because the Free Spectral Range of two resonator cavitys is slightly different, can become addition by the relation that the computing of taking the logarithm will be multiplied each other, then utilize the means such as phase-locked amplification that both are separated.
Wherein the front/rear end of electro-optic crystal 4 is coated with highly reflecting films, consists of the F-P interferometer.The upper and lower surface of electro-optic crystal 4 is posted electrode 5, changes the refractive index of material by applying voltage, thereby changes the light path in the resonator cavity.The voltage signal that applies as shown in Figure 7.As can be seen from Figure 7, the long time dependent function in chamber is the stack of a sine function and linear function.The slope of linear function equals the maximal value of sine function slope, so periodically to occur slope on the curve be 0 point.In design, these slopes are 0 some respective frequencies sampled point.Design is to consider that the fineness of two resonator cavitys is all very high like this, and chamber longitudinal mode width D is very little.If adopt simply linear sweep, then in the process of scanning, the time that both overlap is too of short duration.If with very slow rate scanning, then cause again time of testing oversize.Therefore, the scanning form that the utility model adopts is longer in the sample frequency place residence time, and at other local faster rate scanning of using, has solved this problem.
Above-described embodiment only is explanation technical conceive of the present utility model and characteristics, and its purpose is to allow the personage who is familiar with technique can understand content of the present utility model and according to this enforcement, can not limit protection domain of the present utility model with this.All equivalences of doing according to the utility model Spirit Essence change or modify, and all should be encompassed within the protection domain of the present utility model.
Claims (8)
1. optical frequency territory vernier method spectrometer is characterized in that: comprising:
Incident collimation lens (1) is used for incident light to be measured is coupled into optical fiber;
Tunable F-P interferometer (3), it divides the light wave from described incident collimation lens (1) to pass through by the long selection portion in tuning its chamber;
F-P etalon (7) is used for extracting the light wave from described tunable F-P interferometer (3) characteristic frequency;
Be used for isolating catoptrical the first fiber optical circulator (4), be positioned between tunable F-P interferometer (3) and the F-P etalon (7), be used for receiving the light wave from tunable F-P interferometer (3);
The second fiber optical circulator (9) transmits light wave between this second fiber optical circulator (9) input port and the described F-P etalon (7);
The first Electro-Optical Sensor Set (11) is connected to described the second fiber optical circulator (9) first output ports, is used for light wave is converted into electric signal;
Power measurement module (13) is calculated luminous power according to the electric signal from the first Electro-Optical Sensor Set (11), and sampling also stores the luminous power data;
The second Electro-Optical Sensor Set (12) is connected to described the second fiber optical circulator (9) second output ports, is used for light wave is converted into electric signal;
Wavelength demodulation module (14), according to the luminous power of calculating from the electric signal of the second Electro-Optical Sensor Set (12) after light wave that stabilized light (5) sends passes whole system, sampling is also preserved the luminous power data, and demodulation obtains wavelength data from the luminous power data.
2. optical frequency according to claim 1 territory vernier method spectrometer, it is characterized in that: two end mirrors have different reflectivity at different wavelength in the described tunable F-P interferometer (3).
3. optical frequency according to claim 1 and 2 territory vernier method spectrometer is characterized in that: also comprise:
Stabilized light (5), reception is from the light wave of the 3rd port transmission in described the first fiber optical circulator (4), and the frequency stabilization benchmark light wave that this stabilized light (5) sends is coupled into optical fiber through coupling mechanism (6) with from the light wave of incident collimation lens (1);
The first fiber coupler (2), the light wave that stabilized light (5) sends is superimposed through coupling mechanism (2) and light wave to be measured, and together by interferometer (3);
Fiber Bragg Grating FBG (10) is positioned between described the second fiber optical circulator (9) and the first Electro-Optical Sensor Set (11), the light wave reflection that will send from stabilized light (5), and the frequency range of its stopband and light wave to be measured staggers.
4. optical frequency according to claim 3 territory vernier method spectrometer, it is characterized in that: the light frequency of described stabilized light (5) and the scope of spectrum to be measured stagger.
5. optical frequency according to claim 1 and 2 territory vernier method spectrometer is characterized in that:
Stabilized light (5) is used for providing a frequency stabilization benchmark light wave;
The 3rd fiber optical circulator (8), its the 1st port receives described frequency stabilization benchmark light wave, the 3rd fiber optical circulator (8) the 2nd port and described F-P etalon (7) transmission light wave, the 3rd fiber optical circulator (8) the 3rd port and described the second fiber optical circulator (9) the 1st port transmission light wave;
Fiber Bragg Grating FBG (10) is positioned between described the second fiber optical circulator (9) and the Electro-Optical Sensor Set (11), the light wave reflection that will send from stabilized light (5), and the frequency range of its stopband and light wave to be measured staggers.
6. optical frequency according to claim 5 territory vernier method spectrometer, it is characterized in that: the light frequency of described stabilized light (5) and the scope of spectrum to be measured stagger.
7. optical frequency according to claim 1 and 2 territory vernier method spectrometer is characterized in that: also comprise:
Stabilized light (5) is used for providing a frequency stabilization benchmark light wave;
The second fiber coupler (6), being used for the wavelength-division of frequency stabilization reference light is two-way;
The first fiber coupler (2), the light wave that stabilized light (5) sends is superimposed through the first fiber coupler (2) and light wave to be measured, and together by interferometer (3);
The 3rd fiber optical circulator (8), its the 1st port receives the frequency stabilization benchmark light wave from the second fiber coupler (6), the 3rd fiber optical circulator (8) the 2nd port and described F-P etalon (7) transmission light wave, the 3rd fiber optical circulator (8) the 3rd port and described the second fiber optical circulator (9) the 1st port transmission light wave; The first Electro-Optical Sensor Set (11) is connected to described the second fiber optical circulator (9) first output ports, is used for light wave is converted into electric signal;
The second Electro-Optical Sensor Set (12) is connected to described the second fiber optical circulator (9) second output ports, is used for light wave is converted into electric signal;
Fiber Bragg Grating FBG (10) is positioned between described the second fiber optical circulator (9) and the Electro-Optical Sensor Set (11), the light wave reflection that will send from stabilized light (5), and the frequency range of its stopband and light wave to be measured staggers.
8. optical frequency according to claim 7 territory vernier method spectrometer, it is characterized in that: light frequency and the spectral range to be measured of described selection stabilized light (5) stagger.
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| CN 201220093509 CN202648797U (en) | 2012-03-14 | 2012-03-14 | Optical frequency domain vernier method spectrometer |
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| CN 201220093509 Expired - Fee Related CN202648797U (en) | 2012-03-14 | 2012-03-14 | Optical frequency domain vernier method spectrometer |
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