CN103794982B - Stablize method and the device of 1529nm optical fiber communication laser frequency - Google Patents
Stablize method and the device of 1529nm optical fiber communication laser frequency Download PDFInfo
- Publication number
- CN103794982B CN103794982B CN201410024555.XA CN201410024555A CN103794982B CN 103794982 B CN103794982 B CN 103794982B CN 201410024555 A CN201410024555 A CN 201410024555A CN 103794982 B CN103794982 B CN 103794982B
- Authority
- CN
- China
- Prior art keywords
- laser
- semiconductor laser
- frequency
- rubidium
- light path
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Optical Communication System (AREA)
Abstract
The present invention relates to the Frequency Locking of optical communicating waveband 1529nm laser, specifically a kind of method of stable 1529nm optical fiber communication laser frequency and device.Solve existing optical communicating waveband 1529nm laser steady frequency technology brings noise effect technical problem by frequency modulation(FM).A method for stable 1529nm optical fiber communication laser frequency, comprises the following steps: the 780nm laser that a branch of employing polarization spectrum locks is converted to σ by (a)
+rotatory polarization, then introduces inside and is filled with in the rubidium bubble of rubidium 87 steam; B a branch of linearly polarized laser exported by 1529nm semiconductor laser is introduced in rubidium bubble by (); C the 1529nm laser of outgoing from rubidium bubble is divided into the vertical two-beam in polarization direction by (), gather the strength signal of two-beam and be translated into the corresponding signal of telecommunication respectively and subtract each other, obtaining two-photon polarization spectrum signal; (d) by two-photon polarization spectrum signal feedback to 1529nm semiconductor laser.The present invention can be applicable to the fields such as hyperfine spectrum, frequency standard, accurate measurement.
Description
Technical field
The present invention relates to the Frequency Locking of optical communicating waveband 1529nm laser, specifically a kind of method of stable 1529nm optical fiber communication laser frequency and device.
Background technology
Optical communication network is the basic platform of modern communication networks, and dense wave division multipurpose (DWDM) technology of optical communication can make message capacity significantly increase, and improves message capacity further, just needs to reduce channel spacing, and so the crosstalk of interchannel just becomes more serious.At present, people adopt multiple atom, molecular spectrum to be used as 1.5 microns of optical communicating waveband optical maser wavelength calibrations, and frequency stability is high, 1.5 micron waveband wavelength reference source of small size, pocket become the focus of research.Improve the frequency stability of 1529nm optical communicating waveband laser frequency stabilizing system, be expected to improve the laser frequency stability near dwdm system C-band 196.0THz; Calibration laser wavemeter is carried out by the Frequency Locking system of 1529nm semiconductor laser, the systematic error of wavemeter during in order to reduce to measure communication band laser, more reliable, accurate, thus be expected the wavemeter adopt calibration in the wdm optical communication system of DWDM and future more crypto set after and measure more accurately, more reliably and proofread the optical maser wavelength of communication channel, for system maintenance, System Expansion upgrading, to reduce system signal crosstalk significant.
Correlative study has been done to optical communicating waveband laser frequency standard near 1.5 microns in the aspects such as Chinese scholars main never homoatomic, molecular spectrum and Frequency Stabilization Technique.Mainly be divided into by with reference to spectral line and frequency-stabilizing method: 1) molecular spectrum: acetylene (Acetylene,
12c
2h
2) 1510-1540nm50 bar, hydrogen cyanide (hydrogencyanide, H
13c
14n) 1530-1565nm50 bar, carbon monoxide (carbonmonoxide)
12c
16o1560-1595nm40 bar,
13c
16o1595-1628nm35 bar, all adopts absorption spectra method, and absorb with reference to comparatively ripe with acetylene molecule, laser frequency stability can reach 10
-10; 2) neon (Ne) atom: 2S
2-2P
1transition energy level, 1523nm, He-Ne pipe laser adopts Lamb dip frequency stabilization or zeeman frequency stabilization method, and recent a number of offshore company has the stable He-Ne Lasers calibration source product of 1523nm Lamb dip and sells, and laser frequency stability can reach 10
-8, 1) and 2) Atom and molecule absorption signal weak, poor signal to noise, and laser is locked also need to carry out frequency modulation(FM); 3) rubidium (Rb) atom: 5S
1/2-5P
3/2(D
2line) transition energy level, the frequency multiplication of 1560nm, recycle sub-Doppler's spectrographic technique (see document V.Mahal, OpticsLetters21,1217 (1996)) after adopting frequency-doubling crystal frequency multiplication, the method needs to carry out frequency modulation(FM); 4) rubidium (Rb) atom: 5S
1/2-5D
5/2transition, 1556nm(see document M.Poulin, IEEEPhoto.Tech.Lett.9,1631 (1997)); 5S
1/2-7S
1/2transition, 1520nm(is see document H.C.Chui, Appl.Opt.43,6348 (2004)), Two-photon Absorption Spectrum method is adopted, because Two-photon Absorption Spectrum intermediate state is a virtual energy state, transition probability is lower, so need light intensity too strong, require high to laser power, and need to carry out frequency modulation(FM); 5) rubidium (Rb) atom: 5P
3/2-4D
3/2or 4D
5/2transition energy level between excitation state, 1529nm, optical double resonance spectrum or double resonance optical pumping spectrographic technique are (see document H.S.Moon, Appl.Phys.Lett.85,3965 (2004)), in the middle of the method, excitation state is an in esse energy level, does not need too large light intensity can obtain good signal to noise ratio, but needs to carry out frequency modulation(FM).
Optical communicating waveband laser frequency stabilization technology great majority need to carry out direct or indirect frequency modulation(FM) to laser near existing 1.5 microns both at home and abroad, then its frequency discrimination curve is gone out by lock-in amplifier phase demodulation, lock this laser, like this can bring certain frequency noise to laser.
Therefore, if not needing to carry out laser frequency disturbance and the frequency discrimination signal without the need to obtaining high s/n ratio under carrying out phase-sensitive detection situation, the noise that frequency modulation(FM) brings can be eliminated, improves laser frequency stability.
Summary of the invention
The present invention brings noise effect for solving existing optical communicating waveband 1529nm laser steady frequency technology by frequency modulation(FM), and then the technical problem that the raising of its frequency stability is restricted, a kind of method and device of stable 1529nm optical fiber communication laser frequency are provided.
The method of stable 1529nm optical fiber communication laser frequency of the present invention realizes by the following technical solutions: a kind of method of stable 1529nm optical fiber communication laser frequency, comprises the following steps: a branch of employing polarization spectrum is locked in the hyperfine energy level 5S of rubidium 87 atom by (a)
1/2(F=2)-5P
3/2780nm laser on (F '=3) transition line is converted to σ
+rotatory polarization, then introduces inside and is filled with in the rubidium bubble of rubidium 87 steam; B a branch of linearly polarized laser exported by 1529nm semiconductor laser is introduced in rubidium bubble by (), and 1529nm laser oppositely overlaps with 780nm laser in rubidium bubble; C () makes 1529nm semiconductor laser output frequency at 5P
3/2(F '=3)-4D
5/2(F "=4) transition interscan among a small circle; by light that the 1529nm linearly polarized light of outgoing from rubidium bubble is divided into two bundle polarization directions vertical in scanning process; gather the strength signal of two-beam respectively and be translated into the corresponding signal of telecommunication; these two signals of telecommunication being subtracted each other, obtains two-photon polarization spectrum signal; D () closes scanning to 1529nm semiconductor laser output frequency, and by two-photon polarization spectrum signal feedback to the current-modulation port of 1529nm semiconductor laser, by the Frequency Locking of 1529nm semiconductor laser at hyperfine energy level 5P
3/2(F '=3)-4D
5/2on (F "=4) transition line.
Figure 2 shows that the rubidium 87 atom notch cuttype degeneracy three level system 5S corresponding to frequency locker fixed point
1/2(F=2)-5P
3/2(F '=3)-4D
5/2(F "=4), upper and lower transition be cyclical transition (according to transition rule (△ F=0, ± 1), 4D
5/2the atom of (F "=4) state spontaneous radiation can only get back to 5P
3/2(F '=3) state, and 5P
3/2(F '=3) state atom spontaneous radiation can only get back to 5S
1/2(F=2) state).Time initial, rubidium atom is distributed on the different Zeeman of ground state (Zeeman) energy level symmetrically, the CG(Clebsch-Gordan due between different Zeeman state) coefficient difference, if 780nm pump light is σ
+circular polarization, arrived by the most of atom population of Zeeman state optical pumping effect | F=2, m=+2> state, then
σ + rotatory polarization will | the atom of F=2, m=+2> state is energized into significantly | F '=3, m=+3> state, thus for 1529nm linearly polarized laser detection and
σ + component is relevant | F '=3, m=+3>-|F " and=4, m=+4> transition and and σ
-component is relevant | F '=3, m=+3>-|F " and " difference " of=4, m=+2> transition lays a good foundation.Atom is at 5P
3/2on (F '=3) sub-energy level of Zeeman, i on population distribution is asymmetric, result in the anisotropy of atomic medium, shows as and is in atom on the sub-energy level of different Zeeman for σ
+and σ
-the absorption of light field is different.The 1529nm of linear polarization detects light and can regard σ as
+, σ
-circularly polarized light, according to the superposition of fixed skew, due to the anisotropy of atomic medium, causes σ in 1529nm linearly polarized light
-component and σ
+component absorption coefficient in rubidium bubble is different, and refraction coefficient in rubidium bubble is also different, thus causes the phase difference of two circularly polarized light components to change, finally makes 1529nm linear polarization polarisation of light change.Light vertical for two polarization component of the 1529nm of outgoing from rubidium bubble is separated detection, obtain the feedback signal of two-photon polarization spectrum as 1529nm semiconductor laser (by the 1529nm light of outgoing in rubidium bubble is divided into the vertical two-beam in polarization direction, again its intensity is subtracted each other and just can obtain), do not need like this to carry out disturbance to laser frequency and the good frequency discrimination curve of signal to noise ratio can be obtained without the need to carrying out phase-sensitive detection, eliminate the error that frequency modulation(FM) brings.Based on this, compared with existing laser steady frequency technology, the method that two-photon polarization spectrum of the present invention stablizes 1529nm optical fiber communication laser frequency solves existing laser steady frequency technology and brings its frequency stability of noise effect to improve the problem be restricted by extra modulation to laser.Experiment shows, within 1529nm laser output frequency can be locked in 1.0MHz by the method adopting two-photon polarization spectrum of the present invention to stablize 1529nm optical fiber communication laser frequency, locking time was more than 300 minutes.
Further, the light intensity of described 780nm laser is greater than 1.67mW/cm
2, be less than 10.90mW/cm
2.
Light intensity due to 780nm circularly polarized laser is greater than the saturated light intensity (1.67mW/cm of cyclical transition
2), most of atom can be arrived by population by Zeeman state optical pumping effect | F=2, the atom of m=+2> state is energized into significantly | F '=3, m=+3> state, the signal strength signal intensity of the final two-photon polarization spectrum obtained can be significantly improved, and then improve the stability of Frequency Locking.
The device of stable 1529nm optical fiber communication laser frequency of the present invention realizes by the following technical solutions: a kind of device of stable 1529nm optical fiber communication laser frequency, comprises 780nm semiconductor laser, the first optical isolator, the 1/1st wave plate, the first polarization beam splitter prism, quarter-wave plate and the 780nm light reflection 1529nm Transmission light double color plate be successively set on 780nm semiconductor laser emitting light path; Described quarter-wave plate is positioned on the transmitted light path of the first polarization beam splitter prism; The reflected light path of the first polarization beam splitter prism is provided with a polarization spectrum device, and the emitting light path of polarization spectrum device is provided with photodetector; The output signal of described photodetector is divided into two, and a road is connected with the current-modulation port of 780nm semiconductor laser; The reflected light path of described double color plate is provided with the rubidium bubble that an inside is filled with rubidium 87 steam; The wave plate axle of the laser polarization that 780nm semiconductor laser exports and quarter-wave plate is at 45 °;
Also comprise a 1529nm semiconductor laser and drive the signal generator of 1529nm semiconductor laser; The emitting light path of described 1529nm semiconductor laser is disposed with the second optical isolator, the 1/2nd wave plate and the first speculum; The reflected light path of the first speculum steeps through rubidium and oppositely overlaps with the reflected light path of double color plate; The transmitted light path of double color plate is provided with successively second polarization beam splitter prism and difference photodetector; A probe of described difference photodetector is positioned on the transmitted light path of the second polarization beam splitter prism; The reflected light path of the second polarization beam splitter prism is provided with second speculum; Another probe of described difference photodetector is positioned on the reflected light path of the second speculum; The output signal of difference photodetector is divided into two, and a road is connected with proportional integral amplifier, and proportional integral amplifier signal output is connected with the current-modulation port of 1529nm semiconductor laser; The laser that described 1529nm semiconductor laser incides rubidium bubble is and polarization beam splitter prism feature axis linearly polarized light in angle of 45 degrees.
During work, the high stability single-mode laser that the semiconductor laser of 780nm exports incides polarization beam splitter prism through after the first optical isolator, the 1/1st wave plate successively, then by polarization beam splitter prism separate the faint reverberation (10 μ about W) of a part by polarization spectrum device (directly can produce the polarization spectrum with discriminability for locking 780nm laser) laggard enter photodetector, photodetector, by the current-modulation port of polarization spectrum signal back 780nm semiconductor laser, locks itself into rubidium 87 atom 5S
1/2(F=2) – 5P
3/2on (F '=3) cyclical transition line, frequency fluctuation ~ 600kHz after locking.Simultaneously the high stability single-mode laser that exports of the semiconductor laser of 780nm is becoming σ after quarter-wave plate (780nm laser polarization and wave plate axle at 45 °)
+rotatory polarization, 780nm σ
+rotatory polarization incides after being reflected by double color plate in rubidium bubble, and in steeping, most of rubidium 87 atom is by ground state 5S
1/2(F=2) pumping is to intermediate state 5P
3/2(F '=3) on.
Triangular wave is added to the current-modulation port of 1529nm semiconductor laser, scanning frequency is 60Hz, and sweep amplitude is 30mV, makes its frequency at 5P
3/2(F '=3)-4D
5/2scan among a small circle between (F "=4), the linearly polarized light of its 1529nm exported successively through the second optical isolator and the 1/2nd wave plate (rotate the 1/2nd wave plate and make 1529nm laser polarization and the second polarization beam splitter prism feature axis in angle of 45 degrees) and enter after the first speculum reflects rubidium steep in (with 780nm σ
+rotatory polarization oppositely overlaps); The transmitted light of 1529nm is through entering the second polarization beam splitter prism after double color plate, and the folded light beam of the second polarization beam splitter prism enters difference photodetector with transmitted light after the second speculum simultaneously, and that now obtain is corresponding 5S
1/2(F=2)-5P
3/2(F '=3)-4D
5/2the two-photon polarization spectrum of (F ' '=4) transition, difference photodetector is input to the current-modulation port of 1529nm laser after the two-photon polarization spectrum signal of acquisition is outputted to proportional integral amplifier, for locking the frequency of 1529nm semiconductor laser Output of laser.The signal that proportional integral amplifier exports is added in 1529nm laser diode current modulation port after voltage amplification, and drive current makes 1529nm frequency shift, to 5S
1/2(F=2)-5P
3/2(F '=3)-4D
5/2(F ' '=4) mobile, error signal is stabilized near null value, thus realizes frequency stabilization.The laser that first, second optical isolator can prevent optical element to be reflected back enters in laser, upsets zlasing mode.The effect of quarter-wave plate is that 780nm line polarisation is become σ
+rotatory polarization.The effect of the 1/2nd wave plate 1529nm is swashed polarisation of light to be rotated into and the second polarization beam splitter prism feature axis linearly polarized light in angle of 45 degrees.
5S is shown in Fig. 3
1/2(F=2)-5P
3/2(F '=3)-4D
5/2the two-photon polarization spectrum signal of (F "=4) transition.
Further, described rubidium bubble is arranged on two ends and is provided with in the magnetic shielding cylinder of opening; Described double color plate and the first speculum lay respectively at two open outer side of magnetic shielding cylinder; The reflected light path of described first speculum and double color plate oppositely overlaps and all through two openings of magnetic shielding cylinder.
Rubidium bubble is arranged in magnetic shielding cylinder, can stray magnetic field effectively invariably in magnetic field and surrounding environment and alternating magnetic field to the interference of each energy level of rubidium 87 atom, ensure stability and the accuracy of extracting two-photon polarization spectrum signal, and then ensure the stability of Frequency Locking.
Based on above feature, with both at home and abroad near existing 1.5 microns compared with optical communicating waveband laser frequency technology, the present invention designs implementation method and generating apparatus has the following advantages: the semiconductor laser of (1), 780nm, is locked it in the hyperfine energy level 5S of rubidium 87 atom by nothing modulation, frequency stability polarization spectrum that is high, compact conformation
1/2(F=2)-5P
3/2on (F '=3) transition line.
(2), the hyperfine energy level 5P of rubidium 87 atom
3/2(F '=3)-4D
5/2(F "=4) transition spectral line has the advantage that signal to noise ratio is high, background is smooth, adopts unmodulated two-photon polarization spectrum by 1529nm laser stabilization on this transition line, can improve the frequency stability of the 1529nm semiconductor laser of optical communicating waveband.
(3), do not need in whole system to carry out disturbance to laser frequency and without the need to carrying out phase-sensitive detection, obtain the frequency discrimination signal of high s/n ratio, eliminate the noise that frequency modulation(FM) brings, improve laser frequency stability, there is compact conformation, the feature that frequency stability is high.
The present invention overcomes the shortcoming that original locking method needs frequency modulating technology, and use nothing is modulated, frequency stability is high, the two-photon polarization spectrum Frequency Stabilization Technique of compact conformation, directly the laser frequency of optical communication C-band 196.0THz is stablized.Native system directly can be used for improving the stability of this long wavelength laser, also directly can calibrate the wavemeter of optical communicating waveband, improves the calibration accuracy of wavemeter.Can be applicable to hyperfine spectrum, frequency standard, accurate measurement, polyatom cooling equally and the field such as to capture.
Accompanying drawing explanation
Fig. 1 is the structural representation of device of the present invention.
Fig. 2 is rubidium 87 atomic energy level system involved in the present invention.
Fig. 3 is the hyperfine energy level 5S that the present invention adopts
1/2(F=2)-5P
3/2(F '=3)-4D
5/2the two-photon polarization spectrum that (F "=4) transition is corresponding.
Fig. 4 is the variation diagram that the present invention locks rubidium bubble error signal before and after laser frequency.
1-780nm semiconductor laser, 2-first optical isolator, 3-the 1/1st wave plate, 4-first polarization beam splitter prism, 5-polarization spectrum device, 6-photodetector, 7-the one BNC line, 8-oscilloscope, 9-the 2nd BNC line, 10-quarter-wave plate, 11-double color plate, 12-rubidium steeps, 13-1529nm semiconductor laser, 14-second optical isolator, 15-the 1/2nd wave plate, 16-first speculum, 17-second polarization beam splitter prism, 18-second speculum, 19-difference photodetector, 20-the 3rd BNC line, 21-the 4th BNC line, 22-proportional integral amplifier, 23-the 5th BNC line, 24-signal generator, 25-the 6th BNC line, 26-magnetic shielding cylinder.
Embodiment
A method for stable 1529nm optical fiber communication laser frequency, comprises the following steps: a branch of employing polarization spectrum is locked in the hyperfine energy level 5S of rubidium 87 atom by (a)
1/2(F=2)-5P
3/2780nm laser on (F '=3) transition line is converted to σ
+rotatory polarization, then introduces the inner rubidium being filled with rubidium 87 steam and steeps in 12; B a branch of linearly polarized laser exported by 1529nm semiconductor laser 13 is introduced in rubidium bubble 12 by (), and 1529nm laser oppositely overlaps with 780nm laser in rubidium bubble 12; C () makes 1529nm semiconductor laser 13 output frequency at 5P
3/2(F '=3)-4D
5/2(F "=4) transition interscan among a small circle; by light that the 1529nm linearly polarized light of outgoing from rubidium bubble 12 is divided into two bundle polarization directions vertical in scanning process; gather the strength signal of two-beam respectively and be translated into the corresponding signal of telecommunication; these two signals of telecommunication being subtracted each other, obtains two-photon polarization spectrum signal; D () closes scanning to 1529nm semiconductor laser 13 output frequency, and by two-photon polarization spectrum signal feedback to the current-modulation port of 1529nm semiconductor laser 13, by the Frequency Locking of 1529nm semiconductor laser 13 at hyperfine energy level 5P
3/2(F '=3)-4D
5/2on (F "=4) transition line.
The light intensity of described 780nm laser is more than or equal to 1.67mW/cm
2, be less than 10.90mW/cm
2(1.67mW/cm can be selected
2, 2.0mW/cm
2, 3.0mW/cm
2, 3.52mW/cm
2, 4.0mW/cm
2, 5.0mW/cm
2, 6.0mW/cm
2, 7.0mW/cm
2, 8.0mW/cm
2, 9.0mW/cm
2, 10.0mW/cm
2, 10.80mW/cm
2).
A device for stable 1529nm optical fiber communication laser frequency, comprises 780nm semiconductor laser 1, the first optical isolator the 2, the 1/1st wave plate 3, first polarization beam splitter prism 4, quarter-wave plate 10 and the 780nm light reflection 1529nm Transmission light double color plate 11 be successively set on 780nm semiconductor laser 1 emitting light path; Described quarter-wave plate 10 is positioned on the transmitted light path of the first polarization beam splitter prism 4; The reflected light path of the first polarization beam splitter prism 4 is provided with a polarization spectrum device 5, and the emitting light path of polarization spectrum device 5 is provided with photodetector 6; The output signal of described photodetector 6 is divided into two, and a road is connected with the current-modulation port of 780nm semiconductor laser 1; The reflected light path of described double color plate 11 is provided with the rubidium bubble 12 that an inside is filled with rubidium 87 steam; The wave plate axle of the laser polarization that 780nm semiconductor laser 1 exports and quarter-wave plate 10 is at 45 °;
Also comprise a 1529nm semiconductor laser 13 and drive the signal generator 24 of 1529nm semiconductor laser 13; The emitting light path of described 1529nm semiconductor laser 13 is disposed with the second optical isolator the 14, the 1/2nd wave plate 15 and the first speculum 16; The reflected light path of the first speculum 16 steeps 12 through rubidium and oppositely overlaps with the reflected light path of double color plate 11; The transmitted light path of double color plate 11 is provided with successively second polarization beam splitter prism 17 and difference photodetector 19; A probe of described difference photodetector 19 is positioned on the transmitted light path of the second polarization beam splitter prism 17; The reflected light path of the second polarization beam splitter prism 17 is provided with second speculum 18; Another probe of described difference photodetector 19 is positioned on the reflected light path of the second speculum 18; The output signal of difference photodetector 19 is divided into two, and a road is connected with proportional integral amplifier 22, and proportional integral amplifier 22 signal output part is connected with the current-modulation port of 1529nm semiconductor laser 13; The laser that described 1529nm semiconductor laser 13 incides rubidium bubble 12 is and polarization beam splitter prism 17 feature axis linearly polarized light in angle of 45 degrees.
Described rubidium bubble 12 is arranged on two ends and is provided with in the magnetic shielding cylinder 26 of opening; Described double color plate 11 and the first speculum 16 lay respectively at two open outer side of magnetic shielding cylinder 26; The reflected light path of described first speculum 16 and double color plate 11 oppositely overlaps and all through two openings of magnetic shielding cylinder 26.
Described first speculum 16 adopts 45 degree of total reflective mirrors; Described first speculum 16 normal becomes miter angle with the emitting light path of the 1/2nd wave plate 15; The normal of double color plate 11 reflecting surface becomes miter angle with the emitting light path of quarter-wave plate 10; Described second speculum 18 adopts 45 degree of total reflective mirrors; Described second speculum 18 normal becomes miter angle with the reflected light path of the second polarization beam splitter prism 17.
Another road of photodetector 6 is connected with an oscilloscope 8; Another road of described difference photodetector 19 is connected with the signal input part of oscilloscope 8.Oscilloscope 8 achieves the real-time display of waveform, for the result of monitoring frequency locking.
The two-way output signal of described photodetector 6 is connected with oscilloscope 8 and 780nm semiconductor laser 1 with the 2nd BNC line 9 respectively by a BNC line 7; Described difference photodetector 19 two-way output signal is connected with oscilloscope 8 and proportional integral amplifier 22 with the 4th BNC line 21 respectively by the 3rd BNC line 20; Described proportional integral amplifier 22 is connected with 1529nm semiconductor laser 13 by the 5th BNC line 23; Described signal generator 24 is connected by the 6th BNC line 25 with 1529nm semiconductor laser 13.
Described 1529nm semiconductor laser 13 adopts communication band 14 pin butterfly to encapsulate 1529nm semiconductor laser; Described rubidium bubble 12 is the hollow cylinder transparent vessel of external diameter 25mm, length 50mm.
During concrete enforcement, the high stability single-mode laser that the semiconductor laser 1 of 780nm exports incides polarization beam splitter prism 4 through after the first optical isolator the 2, the 1/1st wave plate 3 successively, then separated after the faint reverberation of a part crosses polarization spectrum device 5 by the first polarization beam splitter prism 4 and enter detector 6, by polarization spectrum signal back 780nm semiconductor laser 1, lock itself into rubidium 87 atom 5S
1/2(F=2) – 5P
3/2on (F '=3) cyclical transition line, frequency fluctuation ~ 600kHz after locking; The transmitted light separated from polarization beam splitter prism 4 crosses quarter-wave plate 10(and its axle is at 45 °) after become σ
+rotatory polarization, 780nm σ
+rotatory polarization incides the rubidium bubble 12 being placed in magnetic shielding cylinder 26 after being reflected by double color plate 11, its power is 84.3 μ W, and beam diameter is 2mm, and light intensity is 2.68mW/cm
2.Conditioning signal generator 24, triangular wave is added to the current-modulation port of communication band 14 pin butterfly encapsulation 1529nm semiconductor laser 13, scanning frequency is 60Hz, and sweep amplitude is 30mV, makes its frequency at 5P
3/2(F '=3)-4D
5/2scan among a small circle between (F "=4); the line polarisation of its 1529nm exported is successively through the second optical isolator 14 and the 1/2nd wave plate 15; become and the second polarization beam splitter prism 17 feature axis linearly polarized light in angle of 45 degrees, after 45 degree total reflective mirrors reflections, then enter the rubidium being placed in magnetic shielding cylinder steep (with 780nm σ
+rotatory polarization oppositely overlaps), its power is 100 μ W, and beam diameter is 1.9mm, light intensity ~ 3.52mW/cm
2, the transmitted light of 1529nm enters polarization beam splitter prism 17 through after double color plate 11, and folded light beam enters difference photodetector 19 with transmitted light after 45 degree of total reflective mirrors 18 simultaneously, and that now obtain is corresponding 5S
1/2(F=2)-5P
3/2(F '=3)-4D
5/2the two-photon polarization spectrum of (F ' '=4) transition, the output signal of detector is leaded up to BNC line and is input to oscilloscope 8 and carries out real-time waveform display, another road is connected to through BNC line the current-modulation port being connected to 1529nm semiconductor laser 13 after proportional integral amplifier 22 again through a BNC line successively, for locking the frequency of 1529nm semiconductor laser 13 Output of laser.
Can the oscillogram of double-colored polarization spectrum signal that obtains of observation band by oscilloscope 8, can the effect of Real-Time Monitoring Frequency Locking.
The use of 45 degree of total reflective mirrors can make the layout of light path more simple to operation.The light intensity of 780nm semiconductor laser 1 is 2.68mW/cm
2.
As seen from Figure 4, after using method of the present invention to lock laser, locking effect obviously improves, and frequency domain of walker is 1.0MHz magnitude.
In practical application, concrete operation step is as follows: (1) adopts unmodulated polarization spectrum, and the semiconductor laser 1 of 780nm is locked in the hyperfine transition line 5S of rubidium 87 atom by the reverberation utilizing the part that separated by the first polarization beam splitter prism 4 faint
1/2(F=2)-5P
3/2after (F '=3) is upper, 780nm laser is become σ by quarter-wave plate 10 by the transmitted light that the first polarization beam splitter prism 4 separates
+rotatory polarization, the reflection end via double color plate 11 enters the rubidium bubble 12 being placed in magnetic shielding cylinder 26, by part rubidium 87 atom in rubidium bubble 12 by ground state 5S
1/2(F=2) pumping is to intermediate state 5P
3/2(F '=3) on.
(2) conditioning signal generator 24, triangular wave is added to the current-modulation port of communication band 14 pin butterfly encapsulation 1529nm semiconductor laser 13, scanning frequency is 60Hz, and sweep amplitude is 30mV, makes 1529nm semiconductor laser 13 output frequency at 5P
3/2(F '=3)-4D
5/2(F "=4) transition interscan among a small circle; by 1/2nd wave plates 15,1529nm laser is become and polarization beam splitter prism 17 feature axis linearly polarized light in angle of 45 degrees; after 45 degree of total reflective mirrors, enter the rubidium bubble 12 being placed in magnetic shielding cylinder 26, with the σ of 780nm
+rotatory polarization oppositely overlaps, and 5P occurs bubble Atom
3/2(F '=3)-4D
5/2(F "=4) transition, now 1529nm becomes elliptical polarized light, and the line polarisation being divided into two bundle polarization directions vertical after then entering the second polarization beam splitter prism 17 through the transmission end of double color plate is detected by differential detector 19, obtains two-photon polarization spectrum.
(3) reduce triangular voltage sweep amplitude and regulate bias voltage, until thoroughly close, regulating proportional integral amplifier 22 parameter, 1529nm semiconductor laser 13 is locked onto hyperfine energy level 5P
3/2(F '=3)-4D
5/2on (F "=4) transition line, the optical communicating waveband 1529nm laser that frequency stability is high can be obtained.
Claims (9)
1. a method for stable 1529nm optical fiber communication laser frequency, is characterized in that, comprise the following steps: a branch of employing polarization spectrum is locked in the hyperfine energy level 5S of rubidium 87 atom by (a)
1/2(F=2)-5P
3/2780nm laser on (F '=3) transition line is converted to σ
+rotatory polarization, then introduces the inner rubidium being filled with rubidium 87 steam and steeps in (12); B a branch of linearly polarized laser exported by 1529nm semiconductor laser (13) is introduced in rubidium bubble (12) by (), and 1529nm laser oppositely overlaps with 780nm laser in rubidium bubble (12); C () makes 1529nm semiconductor laser (13) output frequency at 5P
3/2(F '=3)-4D
5/2(F "=4) transition interscan among a small circle; the light being divided into two bundle polarization directions vertical the 1529nm linearly polarized light steeping outgoing (12) from rubidium in scanning process; gather the strength signal of two-beam respectively and be translated into the corresponding signal of telecommunication; these two signals of telecommunication are subtracted each other, obtains two-photon polarization spectrum signal; D () closes the scanning to 1529nm semiconductor laser (13) output frequency, and by two-photon polarization spectrum signal feedback to the current-modulation port of 1529nm semiconductor laser (13), by the Frequency Locking of 1529nm semiconductor laser (13) at hyperfine energy level 5P
3/2(F '=3)-4D
5/2on (F "=4) transition line.
2. stablize the method for 1529nm optical fiber communication laser frequency as claimed in claim 1, it is characterized in that, the light intensity of described 780nm laser is more than or equal to 1.67mW/cm
2, be less than 10.90mW/cm
2.
3. the device of a stable 1529nm optical fiber communication laser frequency, for realizing the method for claim 1, it is characterized in that, comprise 780nm semiconductor laser (1), the first optical isolator (2) be successively set on 780nm semiconductor laser (1) emitting light path, the 1/1st wave plate (3), the first polarization beam splitter prism (4), quarter-wave plate (10) and 780nm light reflection 1529nm Transmission light double color plate (11); Described quarter-wave plate (10) is positioned on the transmitted light path of the first polarization beam splitter prism (4); The reflected light path of the first polarization beam splitter prism (4) is provided with a polarization spectrum device (5), and the emitting light path of polarization spectrum device (5) is provided with photodetector (6); The output signal of described photodetector (6) is divided into two, and a road is connected with the current-modulation port of 780nm semiconductor laser (1); The reflected light path of described double color plate (11) is provided with rubidium bubble (12) that an inside is filled with rubidium 87 steam; The wave plate axle of the laser polarization direction that 780nm semiconductor laser (1) exports and quarter-wave plate (10) is at 45 °;
Also comprise a 1529nm semiconductor laser (13) and drive the signal generator (24) of 1529nm semiconductor laser (13); The emitting light path of described 1529nm semiconductor laser (13) is disposed with the second optical isolator (14), the 1/2nd wave plate (15) and the first speculum (16); The reflected light path of the first speculum (16) steeps (12) through rubidium and oppositely overlaps with the reflected light path of double color plate (11); The transmitted light path of double color plate (11) is provided with successively second polarization beam splitter prism (17) and difference photodetector (19); A probe of described difference photodetector (19) is positioned on the transmitted light path of the second polarization beam splitter prism (17); The reflected light path of the second polarization beam splitter prism (17) is provided with second speculum (18); Another probe of described difference photodetector (19) is positioned on the reflected light path of the second speculum (18); The output signal of difference photodetector (19) is divided into two, and a road is connected with proportional integral amplifier (22), and proportional integral amplifier (22) signal output part is connected with the current-modulation port of 1529nm semiconductor laser (13); The laser that described 1529nm semiconductor laser (13) incides rubidium bubble (12) is and the second polarization beam splitter prism (17) feature axis linearly polarized light in angle of 45 degrees.
4. stablize the device of 1529nm optical fiber communication laser frequency as claimed in claim 3, it is characterized in that, described rubidium bubble (12) is arranged on two ends and is provided with in the magnetic shielding cylinder (26) of opening; Described double color plate (11) and the first speculum (16) lay respectively at two open outer side of magnetic shielding cylinder (26); The reflected light path of described first speculum (16) and double color plate (11) oppositely overlaps and all through two openings of magnetic shielding cylinder (26).
5. the device of the stable 1529nm optical fiber communication laser frequency as described in claim 3 or 4, is characterized in that, described first speculum (16) adopts 45 degree of total reflective mirrors; Described first speculum (16) normal becomes miter angle with the emitting light path of the 1/2nd wave plate (15); The normal of double color plate (11) reflecting surface becomes miter angle with the emitting light path of quarter-wave plate (10); Described second speculum (18) adopts 45 degree of total reflective mirrors; Described second speculum (18) normal becomes miter angle with the reflected light path of the second polarization beam splitter prism (17).
6. the device of the stable 1529nm optical fiber communication laser frequency as described in claim 3 or 4, is characterized in that, another signal output part of photodetector (6) is connected with an oscilloscope (8); Another signal output part of described difference photodetector (19) is connected with oscilloscope (8).
7. stablize the device of 1529nm optical fiber communication laser frequency as claimed in claim 5, it is characterized in that, another road of photodetector (6) is connected with an oscilloscope (8); Another road of described difference photodetector (19) is connected with oscilloscope (8).
8. stablize the device of 1529nm optical fiber communication laser frequency as claimed in claim 6, it is characterized in that, the two-way output signal of described photodetector (6) is connected with oscilloscope (8) and 780nm semiconductor laser (1) with the 2nd BNC line (9) respectively by a BNC line (7); Described difference photodetector (19) two-way output signal is connected with oscilloscope (8) and proportional integral amplifier (22) with the 4th BNC line (21) respectively by the 3rd BNC line (20); Described proportional integral amplifier (22) is connected with 1529nm semiconductor laser (13) by the 5th BNC line (23); Described signal generator (24) is connected by the 6th BNC line (25) with 1529nm semiconductor laser (13).
9. the device of the stable 1529nm optical fiber communication laser frequency as described in claim 3 or 4, is characterized in that, described 1529nm semiconductor laser (13) adopts communication band 14 pin butterfly encapsulation 1529nm semiconductor laser; The hollow cylinder transparent vessel that described rubidium bubble (12) is external diameter 25mm, length 50mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410024555.XA CN103794982B (en) | 2014-01-20 | 2014-01-20 | Stablize method and the device of 1529nm optical fiber communication laser frequency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410024555.XA CN103794982B (en) | 2014-01-20 | 2014-01-20 | Stablize method and the device of 1529nm optical fiber communication laser frequency |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103794982A CN103794982A (en) | 2014-05-14 |
| CN103794982B true CN103794982B (en) | 2016-03-30 |
Family
ID=50670431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410024555.XA Expired - Fee Related CN103794982B (en) | 2014-01-20 | 2014-01-20 | Stablize method and the device of 1529nm optical fiber communication laser frequency |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103794982B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107783412A (en) * | 2017-11-03 | 2018-03-09 | 中国科学院国家授时中心 | Two photon transition rubidium atomic clock |
| CN110911963A (en) * | 2019-11-01 | 2020-03-24 | 山西大学 | High-stability polarization spectrum frequency stabilizer |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107851958B (en) | 2015-08-07 | 2021-01-12 | 极光先进雷射株式会社 | Narrow band laser device |
| CN105449512B (en) * | 2015-12-16 | 2018-04-24 | 山西大学 | One kind uses gas-solid interface Asia Doppler reflection spectrum offset frequency frequency regulator and method |
| CN105514797B (en) * | 2016-01-13 | 2018-07-24 | 山西大学 | Laser frequency lock device and method based on the hyperfine energy level spectrum of two-photon |
| CN105514795B (en) * | 2016-02-02 | 2018-07-24 | 山西大学 | Device and method based on the manipulation atom population transfer of speed selection technique |
| CN106092079B (en) * | 2016-05-26 | 2019-07-12 | 北京航天控制仪器研究所 | The frequency-stabilizing method and frequency regulator of fibre optic gyroscope communication band laser light source |
| CN106524897A (en) * | 2016-09-27 | 2017-03-22 | 深圳市中图仪器股份有限公司 | Frequency stabilization apparatus and method for laser interferometer |
| CN110165547A (en) * | 2019-05-15 | 2019-08-23 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of laser frequency stabilisation device and method |
| CN110426869A (en) * | 2019-07-25 | 2019-11-08 | 浙江大学 | A kind of the magneto-optic bistable switch and method of the steam resonant cavity based on rubidium |
| CN112039523B (en) * | 2020-09-04 | 2023-09-22 | 中国科学院精密测量科学与技术创新研究院 | Rubidium two-photon transition optical frequency scale based on polarization modulation |
| CN112600058B (en) * | 2020-12-07 | 2023-06-09 | 中国科学院上海光学精密机械研究所 | Rb-based 87 Modulation transfer spectrum frequency stabilization light path structure |
| CN112782106B (en) * | 2020-12-23 | 2021-11-30 | 山西大学 | Device and method for obtaining narrow-linewidth rydberg atomic spectrum |
| CN113381281B (en) * | 2021-05-11 | 2022-11-11 | 山西大学 | All-optical-grating-based multi-path laser frequency chain locking method and device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101794033A (en) * | 2009-12-31 | 2010-08-04 | 中国科学院武汉物理与数学研究所 | Method and device for strengthening atom steam optical filtering signals by combined Raman |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090289728A1 (en) * | 2008-05-23 | 2009-11-26 | Accubeat Ltd. | Atomic frequency standard based on phase detection |
| US20090296760A1 (en) * | 2008-05-27 | 2009-12-03 | Miao Zhu | Optical Pumping Apparatus and Method to Reduce AC Stark Shift in Atomic Frequency Standards |
-
2014
- 2014-01-20 CN CN201410024555.XA patent/CN103794982B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101794033A (en) * | 2009-12-31 | 2010-08-04 | 中国科学院武汉物理与数学研究所 | Method and device for strengthening atom steam optical filtering signals by combined Raman |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107783412A (en) * | 2017-11-03 | 2018-03-09 | 中国科学院国家授时中心 | Two photon transition rubidium atomic clock |
| CN107783412B (en) * | 2017-11-03 | 2019-11-19 | 中国科学院国家授时中心 | Two photon transition rubidium atomic clock |
| CN110911963A (en) * | 2019-11-01 | 2020-03-24 | 山西大学 | High-stability polarization spectrum frequency stabilizer |
| CN110911963B (en) * | 2019-11-01 | 2021-07-02 | 山西大学 | High-stability polarization spectrum frequency stabilizer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103794982A (en) | 2014-05-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103794982B (en) | Stablize method and the device of 1529nm optical fiber communication laser frequency | |
| Liao et al. | Dual-comb spectroscopy with a single free-running thulium-doped fiber laser | |
| CN110401492B (en) | Radio amplitude modulation signal receiving method based on quantum effect and amplitude modulation quantum receiver | |
| US9863815B2 (en) | Method and apparatus for multifrequency optical comb generation | |
| Lopez et al. | 86-km optical link with a resolution of 2× 10-18 for RF frequency transfer | |
| Terra et al. | Brillouin amplification in phase coherent transfer of optical frequencies over 480 km fiber | |
| CN105091776B (en) | The optical-fiber laser static strain beat frequency demodulating system modulated based on single-side belt frequency sweep | |
| Wu et al. | Direct selection and amplification of individual narrowly spaced optical comb modes via injection locking: design and characterization | |
| US20180216996A1 (en) | Dual-comb spectroscopy with a free-running bidirectionally mode-locked fiber laser | |
| Bertinetto et al. | Frequency stabilization of DBR diode laser against Cs absorption lines at 852 nm using the modulation transfer method | |
| Zhao et al. | Dead-band-free, high-resolution microwave frequency measurement using a free-running triple-comb fiber laser | |
| Ye et al. | Ultrastable optical frequency reference at 1.064/spl mu/m using a C/sub 2/HD molecular overtone transition | |
| CN105180823A (en) | Fiber laser static state strain demodulation system based on frequency locking technology and beat frequency principle | |
| CN106768873B (en) | A kind of method and device measuring high-fineness fineness of cavity | |
| US20220260486A1 (en) | Chirped laser dispersion spectrometer and method | |
| CN102680099A (en) | Method and system for generating and detecting terahenz pulse | |
| CN104483289A (en) | Birefringence detection device and birefringence detection method based on sweep frequency optical coherence tomography technology | |
| Wu et al. | Single-shot measurement of wavelength-resolved state of polarization dynamics in ultrafast lasers using dispersed division-of-amplitude | |
| Wang et al. | Photonic-assisted multiple microwave frequency measurement with improved robustness | |
| Wei et al. | Quantum storage of 1650 modes of single photons at telecom wavelength | |
| Lee et al. | Calibrated 100-dB-dynamic-range electro-optic probe for high-power microwave applications | |
| CN110307862B (en) | Fiber grating beat frequency demodulation system based on radio frequency signal bandwidth detection | |
| Cliche et al. | A high-coherence high-stability laser for the photonic local oscillator distribution of the Atacama Large Millimeter Array | |
| Chen et al. | Amplified frequency double-shifting loop enabled frequency-stepped pulse train for direct time domain CO 2 measurement | |
| Salhi et al. | Measurement of Brillouin gain spectrum with dual‐frequency laser for optical fibre sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160330 Termination date: 20200120 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |