CN207705564U - The outside cavity gas laser of fast frequency hopping - Google Patents
The outside cavity gas laser of fast frequency hopping Download PDFInfo
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- CN207705564U CN207705564U CN201721741265.2U CN201721741265U CN207705564U CN 207705564 U CN207705564 U CN 207705564U CN 201721741265 U CN201721741265 U CN 201721741265U CN 207705564 U CN207705564 U CN 207705564U
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Abstract
The utility model is related to Tunable Laser Technology fields, specifically disclose a kind of outside cavity gas laser of fast frequency hopping, it includes the laser gain device set gradually, collimation lens, frequency locking light path, light splitting piece, exocoel mirror device, optoisolator, condenser lens, polarization maintaining optical fibre, set on the photodetector of light splitting piece side and a thermoelectric cooler and control circuit；The several smooth frequency locking devices of frequency locking optical routing are constituted, which is adjusted using piezoelectric modulator；It include the current feedback circuit of the frequency locking control circuit being electrically connected with light frequency locking device and photodetector electric connection in the control circuit, and the frequency modulation control circuit being electrically connected respectively with current feedback circuit and exocoel mirror device.The utility model realizes quick light frequency modulation and frequency locking using piezoelectric modulator, substantially increases the response speed of frequency modulation and frequency locking, reduces frequency switching time.
Description
Technical field
The utility model is related to Tunable Laser Technology field more particularly to a kind of outer lumen type lasers quickly tuned.
Background technology
With the fast development that mobile interchange, cloud computing, big data store, demand of the human society to communication bandwidth is with every
The growth rate in year about 40% rapidly increases.As a kind of method expanding communication bandwidth, wavelength-division multiplex technique (WDM) is by for many years
Development, wavelength accumulation is more and more, and system becomes increasingly complex.Simple wavelength multiplexing technique cannot meet growing
Bandwidth demand, at this point, coherent light communication is come into being.
In coherent optical communication system, using tunable laser as transmitting light source, it can be between different optical frequencies
It carries out free switching and substantially increases spectrum efficiency to make optical frequencies be fully used.Divide from structure, it is tunable to swash
Light device can be divided into single-chip integration type tunable laser and outer lumen type tunable laser.Since extenal cavity tunable laser device can be with
Very narrow laser linewidth is provided, to realize more high modulation rate and more complicated coded modulation, therefore in existing commercial light net
Prodigious share is occupied in the application of network Transmission system.
Traditional external cavity modulation laser generally carries out light frequency adjusting and locking using temperature control loop.Due to temperature
Degree, which is adjusted, has the gentle denaturation of time delay, causes system frequency switch speed slow, and stabilization time is long, generally cut the wave time be 20~
60 seconds.
Utility model content
The purpose of this utility model is that propose a kind of outside cavity gas laser of fast frequency hopping, using piezoelectric modulator come
It realizes quick light frequency modulation and frequency locking, substantially increases the response speed of frequency modulation and frequency locking, reduce frequency switching time.
To achieve the above object, the utility model provides a kind of outside cavity gas laser of fast frequency hopping comprising：It sets successively
The laser gain device set, collimation lens, frequency locking light path, light splitting piece, exocoel mirror device, optoisolator, condenser lens, guarantor
Polarisation is fine, set on the photodetector of light splitting piece side and a thermoelectric cooler and control circuit；The frequency locking optical routing number
A light frequency locking device is constituted, which is adjusted using piezoelectric modulator；Include in the control circuit and light frequency locking
The current feedback circuit that the frequency locking control circuit and photodetector that device is electrically connected are electrically connected, and it is anti-with electric current respectively
The frequency modulation control circuit that current feed circuit and exocoel mirror device are electrically connected.
Wherein, the laser gain device includes pedestal and the laser gain chip on pedestal, the laser gain core
Spectral region covering C-band, L-band and/or other specified optical communicating wavebands of piece.
Specifically, may include two light frequency locking devices in the frequency locking light path, which includes pedestal, is set to pedestal
On the first optical filter, piezoelectric ceramics, and the second optical filter for being oppositely arranged on piezoelectric ceramics and with the first optical filter.
Further, part plating is equipped with instead on the medial surface that first optical filter is mutually arranged oppositely with the second optical filter
Film is penetrated, the first optical filter is with plating on the second opposite lateral surface to setting of optical filter equipped with anti-reflective film；The part plating is set
Two medial surfaces of reflectance coating collectively form two reflectings surface of an etalon, by changing the driving voltage of piezoelectric ceramics, to change
Become the Free Spectral Range of etalon.
Described two smooth frequency locking devices include the first smooth frequency locking device and the second smooth frequency locking device, the free light of the first smooth frequency locking device
Spectral limit is FSR1, and the Free Spectral Range of the second smooth frequency locking device is FSR2, control FSR1 and FSR2 there are a fine difference,
Then joint Free Spectral Range JFSR=(FSR1*FSR2)/(FSR1-FSR2) of frequency locking light path.
In the utility model, the exocoel mirror device may include piezoelectric ceramics pedestal and speculum, by adjusting
The input voltage of piezoelectric ceramics pedestal adjusts the position of outer resonant reflec-tors, to change laser resonant cavity chamber long.
Further, the speculum front surface portion plating is equipped with reflectance coating, and the plating of speculum rear surface is equipped with anti-reflective film,
The front surface of the speculum and the rear end face of laser gain chip collectively form two faces of outside cavity gas laser resonant cavity.
Furthermore the control circuit further includes the electric current being electrically connected respectively with laser gain device and current feedback circuit
Control circuit, and the temperature-control circuit with thermoelectric cooler electric connection.
The outside cavity gas laser of the fast frequency hopping of the utility model uses piezoelectric ceramics to make light frequency locking device, realizes quick
Frequency locking, while outside cavity gas laser chamber length is carried out using piezoelectric ceramics and is quickly adjusted, it overcomes traditional outside cavity gas laser temperature and adjusts
Chamber length brings the sluggish and slow problem of response speed, substantially increases the response speed of frequency modulation and frequency locking, reduces frequency error factor
Time can will cut wave time control and be less than 1 second.
Description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
Some embodiments of the utility model, for those of ordinary skill in the art, without creative efforts,
Other drawings may also be obtained based on these drawings.
Fig. 1 is a kind of module frame chart of specific embodiment of outside cavity gas laser of the utility model fast frequency hopping；
Fig. 2 is a kind of structural schematic diagram of specific embodiment of outside cavity gas laser of the utility model fast frequency hopping；
Fig. 3 is a kind of structural schematic diagram of specific embodiment of laser gain device in the utility model；
Fig. 4 is a kind of structural schematic diagram of specific embodiment of light frequency locking device in the utility model；
Fig. 5 is a kind of structural schematic diagram of specific embodiment of frequency locking light path in the utility model；
Fig. 6 is a kind of structural schematic diagram of specific embodiment of the utility model China and foreign countries resonant reflec-tors device；
Fig. 7 is a kind of functional block diagram of specific embodiment of current feedback circuit in the utility model；
Fig. 8 is a kind of functional block diagram of specific embodiment of frequency modulation control circuit in the utility model；
Fig. 9 is a kind of signal schematic representation of specific embodiment of frequency modulation control circuit in Fig. 8.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
The every other embodiment obtained, shall fall within the protection scope of the present invention.
As shown in Figure 1, the utility model, which provides a kind of the utility model, provides a kind of outside cavity gas laser of fast frequency hopping,
It include the laser gain device 10 set gradually, collimation lens 20, frequency locking light path, light splitting piece 40, exocoel mirror device 60,
Optoisolator 70, condenser lens 80, polarization maintaining optical fibre 90 are set to the photodetector 50 and a thermoelectricity system of 40 side of light splitting piece
Cooler 100 and control circuit；The several smooth frequency locking devices 30 of frequency locking optical routing are constituted, which uses piezoelectric modulator
It is adjusted；Include the frequency locking control circuit 120 being electrically connected with light frequency locking device 30 and photodetection in the control circuit
The current feedback circuit 130 that device 50 is electrically connected, and it is electrical with current feedback circuit 130 and exocoel mirror device 60 respectively
The frequency modulation control circuit 140 of connection.The utility model provides laser output by laser gain device 10, passes through piezoelectricity light frequency locking
Device 30 selects work light frequency, while adjusting exocoel mirror device 60 with piezoelectric modulator and realizing maximum output luminous power, together
When luminous power and frequency dynamic feedback control carried out by photodetector 50, entire light path is stablized by thermoelectricity device 100, greatly
The big response speed for improving frequency modulation and frequency locking, reduces frequency switching time, can will cut wave time control and be less than 1 second.
As shown in Fig. 2, in the utility model specific embodiment, other than polarization maintaining optical fibre 90, other components are all fixed
In thermoelectric cooler 100, said elements all control operating temperature by thermoelectric cooler 100, to obtain stable work
Make state.Wherein, the laser gain device 10 includes pedestal 101 and the laser gain chip 102 on pedestal 101, is somebody's turn to do
The rear end face 1021 of laser gain chip 102 realizes high reflectance using high reflection plated film, as outside cavity gas laser resonant cavity
One face, the front end face 1022 of laser gain chip 102 is using antireflection plated film (shown in Fig. 3), to realize high-power output.Make
Spectral region for a kind of preferred embodiment of the utility model, the laser gain chip 102 can cover C-band, L waves
Section and/or other specified optical communicating wavebands.
In the utility model, the collimation lens 20 for realizing laser beam collimation.One as the utility model
Kind preferred embodiment, in order to obtain higher frequency locking precision and improve frequency stability, we use the light of two similar structures
Frequency locking device 30 (shown in Fig. 4) constitutes lock glistening light of waves road (shown in Fig. 5).Two light frequency locking devices 30 be specifically divided into the first smooth frequency locking device and
Second smooth frequency locking device, if the Free Spectral Range of the first smooth frequency locking device is FSR1, if the free spectrum model of the second smooth frequency locking device
It encloses for FSR2, using vernier caliper effect, there are a fine difference by control FSR1 and FSR2, then the lock being made of their combinations
The joint Free Spectral Range JFSR of frequency light path can be obtained by formula：JFSR=(FSR1*FSR2)/(FSR1-FSR2).In this way
The joint Free Spectral Range JFSR of entire frequency locking light path can be very big, it is ensured that only unique within the scope of entire adjustable frequency
Solution, improves frequency locking precision and frequency stability, and eliminate the possibility of light mode hopping.Specifically, the described light frequency locking device 30 is adopted
It is quickly adjusted with piezoelectric modulator, realizes assigned frequency quick lock in comprising pedestal 301 is set on pedestal 301
The first optical filter 302, piezoelectric ceramics 304, and be oppositely arranged on piezoelectric ceramics 304 and with the first optical filter 302
Two optical filters 303.Medial surface 3022 that further, first optical filter 302 is arranged oppositely with 303 phase of the second optical filter,
Part plating is equipped with reflectance coating on 3031, lateral surface 3021 from the first optical filter 302 to setting opposite with the second optical filter 303,
Plating is equipped with anti-reflective film on 3032；Two medial surfaces 3022,3031 that the part plating sets reflectance coating collectively form an etalon
Two reflectings surface, can obtain the etalon of different finenesses by designing different reflectivity.Piezoelectric ceramics 304 is using pressure
Electric scissors are sliced.When upper/lower electrode is powered, piezoelectric ceramics 304 generates tangential displacement, by the driving electricity for changing piezoelectric ceramics 304
Pressure can be such that surface 3031 is moved forward and backward along optical axis direction, the Free Spectral Range of etalon be changed, to realize fast lock
Wave.
Light splitting piece 40 in the utility model is divided for realizing light path.Wherein reflected light is input to photodetector 50,
Realize power and frequency feedback；Transmitted light is input to exocoel mirror device 60, realizes laser lasing.
As shown in fig. 6, the exocoel mirror device 60 may include piezoelectric ceramics pedestal 601 and speculum 602.Wherein
The plating of 602 front surface of speculum, 6021 part is equipped with reflectance coating, and the plating of 602 rear surface 6022 of speculum is equipped with anti-reflective film, the reflection
The front surface 6021 of mirror 602 and the rear end face 1021 of laser gain chip 102 together constitute outside cavity gas laser resonant cavity
Two faces.Piezoelectric ceramics pedestal 601 shears piece using piezoelectricity.When upper/lower electrode is powered, piezoelectric ceramics pedestal 601 generates tangentially
Displacement adjusts the position of outer resonant reflec-tors 602 by adjusting the input voltage of piezoelectric ceramics pedestal 601, can make surface
6021 fast move along optical axis direction, long to change laser resonant cavity chamber, achieve the purpose that fast frequency hopping.
Optoisolator 70 is for realizing the isolation to systematic reflection light, it is ensured that the stabilization of laser resonant cavity.Condenser lens
80 for focusing on the laser that laser resonant cavity exports in polarization maintaining optical fibre 90.
Further, the control circuit further includes electric with laser gain device 10 and current feedback circuit 130 respectively
Property connection current control circuit 110, and with thermoelectric cooler 100 be electrically connected temperature-control circuit 150.
Wherein, the current control circuit 110 is used to control the operating current of laser gain chip 102, realizes external
Cavity laser emergent power and frequency are controlled.
Frequency locking control circuit 120 is used for the operating voltage by adjusting piezoelectric ceramics 304, to change the work of light frequency locking device 30
Working frequency.
Current feedback circuit 130 is used to feed back Output optical power and light frequency by the photoelectric current of photodetector 50.Light
DC component feedback light watt level in electric current, the feedback information are supplied to current control circuit 110 for adjust automatically laser
102 electric current of chip gain；Its AC compounent feedback frequency deviation, the feedback information are supplied to frequency modulation control circuit 140 for adjusting
Whole laser resonator chamber is long.As a kind of specific embodiment of the utility model, the current feedback circuit 130 (shown in Fig. 7) is interior
Further include having the demodulator circuit 1301 being electrically connected with each other and analysis circuit 1302, which also visits with photoelectricity
It surveys device 50 to be electrically connected, 1302 one end of analysis circuit also electrically connects with current control circuit 110 and frequency modulation control circuit 140 respectively
It connects.
Frequency modulation control circuit 140 is used to control the operating voltage of piezoelectric ceramics pedestal 601 in exocoel mirror device 60, changes
The optical length for becoming outside cavity gas laser resonant cavity to change shoot laser frequency, and provides the friendship of a fixed frequency simultaneously
Signal is flowed, dynamic frequency scalable is carried out.As shown in figure 8, a kind of alternative embodiment as the utility model, the frequency modulation
Include in control circuit 140 one with exocoel mirror device 60 be electrically connected signal synthesis circuit 1403, respectively with the letter
The ac signal circuit 1402 and direct current signal driving circuit 1401 that number combiner circuit 1403 is electrically connected, the direct current signal
1401 one end of driving circuit is also electrically connected with current feedback circuit 130.Frequency modulation control circuit 140 in the present embodiment can carry
For a variable-magnitude DC offset voltage Vbias and constant amplitude alternating voltage Vmod.Wherein DC offset voltage Vbias is used
In the quick adjusting for realizing optical resonator chamber length；Alternating voltage Vmod shows for realizing the real-time dynamical feedback of frequency modulation, signal
It is intended to as shown in Figure 9.When work, the current signal that current feedback circuit 130 feeds back photodetector 50 carries out demodulation analysis,
The information feedback of power and frequency error can be obtained, which is input to current control circuit 110, changes driving current
Realize automated power control (APC)；The feedback signal is input to frequency modulation control circuit 140, and it is real to change DC offset voltage Vbias
Existing automatic frequency control (AFC).
Temperature controls the temperature that 150 circuits are used to control semiconductor cooler, ensures outside cavity gas laser resonant cavity and other
Optical element is in stable operating temperature, its output frequency is made to stablize.
In normal work, current control circuit 110 increases the outside cavity gas laser of the fast frequency hopping of the utility model for laser
Beneficial device 10 provides operating current, and the light that laser gain device 10 is sent out is transformed into collimated light by collimation lens 20, the standard
Direct light through light splitting piece 40 after light frequency locking device 30 by being divided into two beams, and wherein transmitted light passes through exocoel mirror device 60, optically isolated
Device 70 and condenser lens 80 are coupled into polarization maintaining optical fibre 90；Reflected light, which is incident on photodetector 50 and is converted into photoelectric current, to be exported to electricity
Current feedback circuit 130, temperature-control circuit 150 controls thermoelectric cooler 100 and is operated in assigned temperature point, so that it is guaranteed that device is steady
Fixed work；
When needing frequency error factor, frequency locking control circuit 120 adjusts light frequency locking device according to the operating condition of default calibration
30 frequency locking frequency, current feedback circuit 130 provides power and frequency feedback information is given to current control circuit 110 and frequency modulation control
Circuit 140 processed realizes the real-time closed-loop control of power and frequency.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection domain within.
Claims (8)
1. a kind of outside cavity gas laser of fast frequency hopping, which is characterized in that laser gain device, collimation including setting gradually are saturating
Mirror, frequency locking light path, light splitting piece, exocoel mirror device, optoisolator, condenser lens, polarization maintaining optical fibre are set to light splitting piece side
Photodetector and a thermoelectric cooler and control circuit；The several smooth frequency locking devices of frequency locking optical routing are constituted, the light frequency locking
Device is adjusted using piezoelectric modulator；Include that the frequency locking being electrically connected with light frequency locking device controls electricity in the control circuit
Road, with photodetector be electrically connected current feedback circuit, and respectively with current feedback circuit and exocoel mirror device
The frequency modulation control circuit of electric connection.
2. the outside cavity gas laser of fast frequency hopping as described in claim 1, which is characterized in that the laser gain device includes bottom
Seat and the laser gain chip on pedestal, the laser gain chip spectral region covering C-band, L-band and/or its
He specifies optical communicating waveband.
3. the outside cavity gas laser of fast frequency hopping as described in claim 1, which is characterized in that include two in the frequency locking light path
Light frequency locking device, the light frequency locking device include pedestal, the first optical filter, piezoelectric ceramics on pedestal, and on piezoelectric ceramics
And the second optical filter being oppositely arranged with the first optical filter.
4. the outside cavity gas laser of fast frequency hopping as claimed in claim 3, which is characterized in that first optical filter and the second filter
On the medial surface that mating plate is mutually arranged oppositely part plating is equipped with reflectance coating, and the first optical filter is opposite with the second optical filter to setting
Plating is equipped with anti-reflective film on lateral surface；Two medial surfaces that the part plating sets reflectance coating collectively form two of an etalon instead
Penetrate face.
5. the outside cavity gas laser of fast frequency hopping as claimed in claim 3, which is characterized in that described two smooth frequency locking devices include the
One smooth frequency locking device and the second smooth frequency locking device, the Free Spectral Range of the first smooth frequency locking device are FSR1, the second smooth frequency locking device from
It is FSR2, joint Free Spectral Range JFSR=(FSR1*FSR2)/(FSR1-FSR2) of frequency locking light path by spectral region.
6. the outside cavity gas laser of fast frequency hopping as claimed in claim 2, which is characterized in that the exocoel mirror device includes
Piezoelectric ceramics pedestal and speculum.
7. the outside cavity gas laser of fast frequency hopping as claimed in claim 6, which is characterized in that the speculum front surface portion plating
Equipped with reflectance coating, the plating of speculum rear surface is equipped with anti-reflective film, the front surface of the speculum and the rear end face of laser gain chip
Collectively form two faces of outside cavity gas laser resonant cavity.
8. such as the outside cavity gas laser of claim 1-7 any one of them fast frequency hoppings, which is characterized in that the control circuit is also
It is electric including the current control circuit being electrically connected respectively with laser gain device and current feedback circuit, and with thermoelectric cooler
Property connection temperature-control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721741265.2U CN207705564U (en) | 2017-12-13 | 2017-12-13 | The outside cavity gas laser of fast frequency hopping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721741265.2U CN207705564U (en) | 2017-12-13 | 2017-12-13 | The outside cavity gas laser of fast frequency hopping |
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| CN207705564U true CN207705564U (en) | 2018-08-07 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109921275A (en) * | 2017-12-13 | 2019-06-21 | 深圳新飞通光电子技术有限公司 | The outside cavity gas laser of fast frequency hopping |
| CN112310805A (en) * | 2019-08-02 | 2021-02-02 | 苏州旭创科技有限公司 | Narrow-linewidth external cavity laser and optical module |
| CN112310807A (en) * | 2019-08-02 | 2021-02-02 | 苏州旭创科技有限公司 | External cavity tunable laser and optical module |
| CN112397995A (en) * | 2019-08-02 | 2021-02-23 | 苏州旭创科技有限公司 | Narrow-linewidth fixed-wavelength laser and optical module |
| CN112397993A (en) * | 2019-08-02 | 2021-02-23 | 苏州旭创科技有限公司 | Narrow-linewidth external cavity laser and optical module |
| CN112787213A (en) * | 2021-01-11 | 2021-05-11 | 清华大学 | Tunable laser system |
-
2017
- 2017-12-13 CN CN201721741265.2U patent/CN207705564U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109921275A (en) * | 2017-12-13 | 2019-06-21 | 深圳新飞通光电子技术有限公司 | The outside cavity gas laser of fast frequency hopping |
| CN112310805A (en) * | 2019-08-02 | 2021-02-02 | 苏州旭创科技有限公司 | Narrow-linewidth external cavity laser and optical module |
| CN112310807A (en) * | 2019-08-02 | 2021-02-02 | 苏州旭创科技有限公司 | External cavity tunable laser and optical module |
| CN112397995A (en) * | 2019-08-02 | 2021-02-23 | 苏州旭创科技有限公司 | Narrow-linewidth fixed-wavelength laser and optical module |
| CN112397993A (en) * | 2019-08-02 | 2021-02-23 | 苏州旭创科技有限公司 | Narrow-linewidth external cavity laser and optical module |
| CN112397995B (en) * | 2019-08-02 | 2022-02-15 | 苏州旭创科技有限公司 | Narrow-linewidth fixed-wavelength laser and optical module |
| CN112787213A (en) * | 2021-01-11 | 2021-05-11 | 清华大学 | Tunable laser system |
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Effective date of registration: 20240321 Address after: Room 601 and 701, North Block, Yuanxing Technology Building, No.1 Songpingshan Road, High tech Industrial Park (North District), Nanshan District, Shenzhen, Guangdong Province, 518057 Patentee after: Longmet Communication Technology (Shenzhen) Co.,Ltd. Country or region after: Zhong Guo Address before: 518057 xinfeitong optoelectronic building, No.8, Keji South 12 road, Nanshan District, Shenzhen City, Guangdong Province Patentee before: NEOPHOTONICS Corp. Country or region before: Zhong Guo |
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