CN105449506B - A kind of tunable laser system - Google Patents
A kind of tunable laser system Download PDFInfo
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- CN105449506B CN105449506B CN201511032480.0A CN201511032480A CN105449506B CN 105449506 B CN105449506 B CN 105449506B CN 201511032480 A CN201511032480 A CN 201511032480A CN 105449506 B CN105449506 B CN 105449506B
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- 230000003287 optical effect Effects 0.000 claims abstract description 122
- 239000004065 semiconductor Substances 0.000 claims abstract description 48
- 239000013307 optical fiber Substances 0.000 claims abstract description 31
- 230000008859 change Effects 0.000 claims abstract description 16
- 230000037361 pathway Effects 0.000 claims description 10
- 230000000295 complement effect Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 6
- 230000010287 polarization Effects 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 2
- 230000005619 thermoelectricity Effects 0.000 claims description 2
- 238000009414 blockwork Methods 0.000 claims 1
- 241000931526 Acer campestre Species 0.000 abstract description 9
- 238000013461 design Methods 0.000 abstract description 2
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000001069 Raman spectroscopy Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0085—Modulating the output, i.e. the laser beam is modulated outside the laser cavity
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The present invention relates to field of lasers, more particularly to a kind of tunable laser system, including sequentially connected laser, optics microscope group and optical fiber, the adjustable laser of the laser emission wavelength is simultaneously incident on by optics microscope group in optical fiber, further include the optical path adjusting unit being arranged on laser optical path and semiconductor amplifier unit, wherein：Optical path adjusting unit comprising adjustment module and optical mirror slip；Semiconductor amplifier unit comprising semiconductor amplifier, be arranged semiconductor amplifier front end the first coupled lens and the first collimation lens in semiconductor amplifier rear end is set.The present invention by design it is a kind of can the humorous tunable laser system of shadow, optical path adjusting unit is set on optical beam path to change the optical circuit path of laser, the adjustable laser of laser emission wavelength is set to realize that shadow is humorous, it avoids during realizing optical maser wavelength tuning, larger laser is interfered to be directly incident in optical fiber, and its is simple in structure, is convenient for use of large-scale production.
Description
Technical field
The present invention relates to field of lasers, and in particular to it is a kind of can the humorous tunable laser system of shadow.
Background technology
Tunable laser refers to that can continuously change the laser of laser output wavelength, this laser in a certain range
Device it is widely used, can be used for spectroscopy, photochemistry, medicine, biology, integrated optics, pollution monitoring, semi-conducting material add
Work, information processing and communication etc., especially optical communication system, using more and more extensive.
There are three ways to realizing optical maser wavelength tuning, the first is low by certain elements (such as grating) change resonant cavity
The wavelength corresponding to area is lost to change the wavelength of laser；Second is by changing certain external parameter (such as magnetic fields, temperature
Deng) make the energy shift of laser transition；The third is transformation and tuning using nonlinear effect realization wavelength (see nonlinear optical
, stimulated Raman scattering, two frequency multiplication of light, optical parametric oscillation).
However, tunable laser from be connected to switching channel order (realize wavelength tuning) to by Wavelength stabilized to new tunnel
In the process, the laser frequency application condition of tunable laser transmitting is big, these phase relations of transmitting light to tunable laser
System is extremely harmful, such as coherent system.
How to reduce or avoid during realizing optical maser wavelength tuning, the laser frequency error of tunable laser transmitting
Bigger problem is that those skilled in the art want always one of main problem solved.
Invention content
The technical problem to be solved in the present invention is, for the drawbacks described above of the prior art, provides a kind of tunable laser
Device system avoids the output of interference light during optical maser wavelength tunes.
The technical solution adopted by the present invention to solve the technical problems is：A kind of tunable laser system is provided, including
Sequentially connected laser, optics microscope group and optical fiber, the adjustable laser of the laser emission wavelength are simultaneously incident by optics microscope group
Further include the optical path adjusting unit being arranged on laser optical path and semiconductor amplifier unit into optical fiber, wherein：
Optical path adjusting unit comprising adjustment module and optical mirror slip, the optical mirror slip are arranged in adjustment module, this swashs
The adjustable laser of light device launch wavelength is simultaneously incident on by optical mirror slip in semiconductor amplifier unit, and the adjustment module is for adjusting
The position of optical mirror slip is saved to change the optical circuit path of laser, and forms main optical path path and secondary optical circuit path；
Semiconductor amplifier unit comprising semiconductor amplifier, be arranged semiconductor amplifier front end first coupling
Lens and the first collimation lens in semiconductor amplifier rear end is set, which includes for passing through laser key light
The main waveguide channels in road path and complementary wave pathway by laser pair optical circuit path, it is saturating which passes sequentially through the first coupling
Mirror, the main waveguide channels of semiconductor amplifier and the first collimation lens are simultaneously incident in optical fiber.
Wherein, preferred version is：The adjustment module includes up and down adjustment device, and the up and down adjustment device is for adjusting optical mirror slip
Upper and lower position.
Wherein, preferred version is：The adjustment module includes angle demodulator, and the angle demodulator is for adjusting optical mirror slip
Angle position.
Wherein, preferred version is：The optical mirror slip is optical lens.
Wherein, preferred version is：The optical mirror slip is optical mirror.
Wherein, preferred version is：Further include processor unit, which connect with adjustment module, the processor
Unit controls to adjust module work during laser switched laser wavelength, changes the optical circuit path of laser.
Wherein, preferred version be further include feedback unit, which includes：
First spectroscope, which receives the laser projected from optical path adjusting unit, and fraction of laser light is reflected
Into the second spectroscope；
Second spectroscope, first spectroscope reflection come laser by the second spectroscope be incident on respectively optical detector and
Lock wave device；
Optical detector, the optical detector are connect with processor unit, which is used for the power of detection light；
Wave device is locked, which connect with processor unit, which is used for the frequency of detection light.
Wherein, preferred version is：Further include the thermoelectric cooler being connect with laser, which includes and thermoelectricity
The temperature control circuit of refrigerator connection.
Wherein, preferred version is：The processor unit includes the amplifier drive circuit being connect with semiconductor amplifier.
Wherein, preferred version is：The optical fiber is polarization maintaining optical fibre.
The beneficial effects of the present invention are, compared with prior art, the present invention by design it is a kind of can humorous adjustable of shadow
Humorous Optical Maser System is arranged optical path adjusting unit to change the optical circuit path of laser on optical beam path, makes laser transmitted wave
Long adjustable laser realizes that shadow is humorous, avoids during realizing optical maser wavelength tuning, larger laser being interfered to be directly incident on
In optical fiber, and its is simple in structure, is convenient for use of large-scale production；Meanwhile semiconductor amplifier list is set on optical beam path
Member reduces the decaying of light to improve the power of laser.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing：
Fig. 1 is a kind of structure diagram of tunable laser system of the present invention；
Fig. 2 is a kind of concrete structure block diagram of tunable laser system of the present invention；
Fig. 3 is the structural schematic diagram of the main waveguide channels of laser light incident of the present invention；
Fig. 4 is the structural schematic diagram of laser light incident complementary wave pathway of the present invention；
Fig. 5 is the structure diagram of tunable laser system of the present invention with feedback unit；
Fig. 6 is the structure diagram of feedback unit of the present invention；
Fig. 7 is the structure diagram of processor unit of the present invention；
Fig. 8 is the structural schematic diagram of laser light incident main waveguide channels of the present invention with feedback unit；
Fig. 9 is the structural schematic diagram of laser light incident complementary wave pathway of the present invention with feedback unit.
Specific implementation mode
In conjunction with attached drawing, elaborate to presently preferred embodiments of the present invention.
As depicted in figs. 1 and 2, the present invention provides a kind of preferred embodiment of tunable laser system.
A kind of tunable laser system, including sequentially connected laser 10, optics microscope group 20 and optical fiber 30；Further include
The optical path adjusting unit 40 and semiconductor amplifier unit 50 being arranged on laser optical path, optical path adjusting unit 40 include adjusting mould
Block 41 and optical mirror slip 42；Semiconductor amplifier unit 50 includes semiconductor amplifier 51, is arranged before semiconductor amplifier 51
First coupled lens 52 at end and the first collimation lens 53 in 51 rear end of semiconductor amplifier is set, i.e., the laser 10 emits
Laser optical fiber is incident on by optical mirror slip 42, the first coupled lens 52, semiconductor amplifier 51 and the first collimation lens 53
In 30；Semiconductor amplifier 51 includes for the main waveguide channels 511 and complementary wave pathway 512 by laser.
Wherein, laser 10 and optical fiber 30 are separately positioned on the both ends of optics microscope group 20, and 10 launch wavelength of laser is adjustable
Laser and be incident in optical fiber 30 by optics microscope group 20, make laser realize shadow it is humorous, change the optical circuit path of laser, that is, keep away
Exempt from during realizing optical maser wavelength tuning, larger laser to be interfered to be directly incident in optical fiber 30.
Wherein, optical fiber 30 is preferably polarization maintaining optical fibre.
In the present embodiment, optical path adjusting unit 40 includes adjustment module 41 and optical mirror slip 42, and optical mirror slip 42 is arranged
In adjustment module 41, the adjustable laser of 10 launch wavelength of laser is simultaneously incident on semiconductor amplifier list by optical mirror slip 42
In member 50；Meanwhile adjustment module 41 is used to adjust the position of optical mirror slip 42 to change the optical circuit path of laser, and form key light
Road path and secondary optical circuit path.When normal work, main optical path path is the main propagation path of laser, and in switched laser channel
During (laser tuning), propagation path of the secondary optical circuit path as laser during tuning is incident on secondary optical circuit path
Laser is finally not incident in optical fiber 30.
Further, adjustment module 41 and optical mirror slip 42 respectively include several scheme, specifically：
1, adjustment module 41 is up and down adjustment device, and the upper and lower position of optical mirror slip 42 is adjusted by up and down adjustment device, to
Change the injection optical circuit path by laser on optical mirror slip 42；The adjusting of this upper and lower position is usually to finely tune, upper and lower position
Adjustable range be micron-sized distance, it is ensured that laser is not incident in optical fiber 30.
2, adjustment module 41 is angle demodulator, and the angle position of optical mirror slip 42 is adjusted by angle demodulator, to
Change the injection optical circuit path by laser on optical mirror slip 42；The adjusting of this angle position is usually to finely tune, and is usually adjusted
The rotational angle of optical mirror slip 42 in the horizontal direction is saved, the adjustable range of angle position is micron-sized distance, it is ensured that laser
It is not incident in optical fiber 30.
3, optical mirror slip 42 is optical lens, and preferably collimation lens, collimation lens gathers the laser that laser 10 emits
Collection forms the directional light propagated, and is incident on semiconductor amplifier unit 50；Make optical lens or more by adjustment module 41
Movement horizontally rotates, to change the injection optical circuit path by laser on optical mirror slip 42.
4, optical mirror slip 42 is optical mirror, and collimation lens assembles the laser that laser 10 emits to form the flat of propagation
Row light, and be incident on semiconductor amplifier unit 50；Optical mirror is set to move up and down or horizontal turn by adjustment module 41
It is dynamic, to change the injection optical circuit path by laser on optical mirror slip 42.Wherein, if optical mirror slip 42 is optical mirror,
Optical lens is there is provision of before laser 10, is propagated convenient for the stablizing for laser that laser 10 projects.
In the present embodiment, semiconductor amplifier 51 includes for the main waveguide channels 511 by laser main optical path path
With the complementary wave pathway 512 by laser pair optical circuit path, laser passes sequentially through the first coupled lens 52, semiconductor amplifier 51
Main waveguide channels 511 and the first collimation lens 53 and be incident in optical fiber 30；Laser is improved by semiconductor amplifier 51 to swash
The power of light carries out light amplification using the phenomenon of being excited of transition between the energy levels, obtains the gain of light, be convenient for laser propagation, improve laser
The stability and accuracy of propagation, reduce the decaying of light.
As shown in Figure 3 and Figure 4, the present invention provides a kind of preferable implementation in the laser optical path path of tunable laser system
Example.
A kind of tunable laser system, including the laser 10, the second collimation lens 421, first that set gradually reflect
Mirror 422, the first coupled lens 52, semiconductor amplifier 51, the first collimation lens 53, the second coupled lens 31 and optical fiber 30, half
Conductor amplifier 51 includes for passing through laser main wave pathway 511 and complementary wave pathway 512.
Wherein, adjustment module 41 can be arranged on the second collimation lens 421 or the first speculum 422, if adjustment module
41 are arranged on the second collimation lens 421, and the laser that laser 10 emits can be directly incident on by the second collimation lens 421
In first coupled lens 52, or it is incident in the first coupled lens 52 by the second collimation lens 421 and the first speculum 422；
If adjustment module 41 is arranged on the first speculum 422, laser 10 passes through the second collimation lens 421 and the first speculum 422
It is incident in the first coupled lens 52.
Further, and with reference to figure 4, Fig. 4 provides a kind of mode that shadow is humorous, and adjustment module 41 adjusts the first speculum
422 angle position makes the optical circuit path of laser change, and laser passes through the complementary wave pathway on semiconductor amplifier 51
512 are mapped to outside optical fiber 30, avoid during realizing optical maser wavelength tuning, larger laser being interfered to be directly incident on optical fiber 30
In.
As shown in Fig. 5, Fig. 6 and Fig. 7, the present invention provide a kind of tunable laser system with feedback unit 70 compared with
Good embodiment.
A kind of tunable laser system further includes processor unit 60 and feedback unit in addition to structure described above
70, processor unit 60 connects with laser 10, optical path adjusting unit 40, semiconductor amplifier unit 50 and feedback unit 70 respectively
It connects, feedback unit 70 is arranged in 50 rear end of semiconductor amplifier unit；Wherein, feedback unit 70 is used to detect the information of laser,
Such as laser frequency and laser power, and related test results are sent in processor unit 60, processor unit 60 is according to phase
Testing result and user control signal are closed, laser 10, optical path adjusting unit 40, semiconductor amplifier unit 50 are controlled
System.
In the present embodiment, feedback unit 70 includes the first spectroscope 71, the second spectroscope 72, optical detector 73 and lock wave
Device 74, wherein the first spectroscope 71 is arranged between semiconductor amplifier unit 50 and optical fiber 30, for reflecting fraction of laser light
Onto the second spectroscope 72, i.e. the first spectroscope 71 is arranged between the first collimation lens 53 and the second coupled lens 31；Second
Spectroscope 72 receive by the first spectroscope 71 penetrate Lai laser, and laser is divided into two parts, is incident on optical detector 73 respectively
On lock wave device 74；Optical detector 73 is connect with processor unit 60, and optical detector 73 is used for the power of detection light, processor list
The laser power control semiconductor amplifier unit 50 that member 60 is detected according to optical detector 73 controls semiconductor amplifier list
Semiconductor amplifier 51 in member 50 carries out power regulation to laser by semiconductor amplifier 51, realizes the gain of light；Lock wave
Device 74 is connect with processor unit 60, and lock wave device 74 is used for the frequency of detection light, and processor unit 60 is detected according to lock wave device 74
The laser frequency control optical path adjusting unit 40 arrived, that is, control the adjustment module 41 in optical path adjusting unit 40, by adjusting mould
Block 41 changes the optical circuit path of laser, realizes that shadow is humorous.
Wherein, lock wave device 74 monitors the frequency of laser in real time, after laser frequency tends towards stability during tuning, that is, adjusts
After the completion of humorous, signal will be completed and be sent in processor unit 60.
Further, tunable laser system further includes the thermoelectric cooler 80 being connect with laser 10, processor list
Member 60 includes the temperature control circuit 61 being connect with thermoelectric cooler 80, and processor unit 60 such as switches and swashs according to user control signal
Optical channel (laser frequency in different channels is different), the laser frequency that laser 10 emits is controlled by thermoelectric cooler 80.
Further, processor unit 60 further includes the amplifier drive circuit 62 being connect with semiconductor amplifier 51, place
It manages device unit 60 and semiconductor amplifier unit 50 is controlled by amplifier drive circuit 62.
In Fig. 5, Fig. 6 and Fig. 7 in the present embodiment, solid arrow refers to the direction of propagation of light, thermoelectric cooler 80 with
Except the solid arrow of laser 10, which is to indicate that thermoelectric cooler 80 controls the temperature of laser 10；Dotted line
Arrow is the transmission direction of control signal and data.
As shown in Figure 8 and Figure 9, the present invention provides a kind of laser optical path of the tunable laser system with feedback unit
The preferred embodiment in path.
A kind of tunable laser system further includes that (Fig. 8 and Fig. 9 are equal for processor unit 60 in addition to structure described above
Do not show), the first spectroscope 71, the second spectroscope 72, optical detector 73 and lock wave device 74.
Wherein, laser is incident on after being projected by the first collimation lens 53 on the first spectroscope 71, and the first spectroscope 71 will
Fraction of laser light is reflected on the second spectroscope 72, and laser is divided into two parts by the second spectroscope 72, is incident on optical detector respectively
73 and lock wave device 74 on.
Further, and with reference to figure 9, Fig. 9 provides a kind of mode that shadow is humorous, and adjustment module 41 adjusts the first speculum
422 angle position makes the optical circuit path of laser change, and laser passes through the complementary wave pathway on semiconductor amplifier 51
512 are mapped to outside optical fiber 30, avoid during realizing optical maser wavelength tuning, larger laser being interfered to be directly incident on optical fiber 30
In.Meanwhile after the optical circuit path of laser changes, laser is still entered by the first spectroscope 71 and the second spectroscope 72 respectively
It is mapped on optical detector 73 and lock wave device 74.
As described above, only preferred embodiment is not intended to limit the scope of the present invention, Fan Yibenfa
Equivalent change or modification made by bright claim is all that the present invention is covered.
Claims (10)
1. a kind of tunable laser system, including sequentially connected laser, optics microscope group and optical fiber, the laser transmitted wave
Long adjustable laser is simultaneously incident on by optics microscope group in optical fiber, which is characterized in that further includes the light being arranged on laser optical path
Road adjusts unit and semiconductor amplifier unit, wherein：
Optical path adjusting unit comprising adjustment module and optical mirror slip, the optical mirror slip are arranged in adjustment module, the laser
The adjustable laser of launch wavelength is simultaneously incident on by optical mirror slip in semiconductor amplifier unit, and the adjustment module is for adjusting light
The position of eyeglass is learned to change the optical circuit path of laser, and forms main optical path path and secondary optical circuit path；
Semiconductor amplifier unit comprising the first coupled lens in semiconductor amplifier front end are arranged in semiconductor amplifier
With the first collimation lens in semiconductor amplifier rear end is set, which includes for passing through laser main optical path road
The main waveguide channels of diameter and complementary wave pathway by laser pair optical circuit path, the laser pass sequentially through the first coupled lens, half
The main waveguide channels and the first collimation lens of conductor amplifier are simultaneously incident in optical fiber.
2. tunable laser system according to claim 1, it is characterised in that：The adjustment module includes up and down adjustment
Device, the up and down adjustment device are used to adjust the upper and lower position of optical mirror slip.
3. tunable laser system according to claim 1, it is characterised in that：The adjustment module includes angular adjustment
Device, the angle demodulator are used to adjust the angle position of optical mirror slip.
4. tunable laser system according to any one of claims 1 to 3, it is characterised in that：The optical mirror slip is optics
Lens.
5. tunable laser system according to any one of claims 1 to 3, it is characterised in that：The optical mirror slip is optics
Speculum.
6. tunable laser system according to any one of claims 1 to 3, it is characterised in that：Further include processor unit,
The processor unit is connect with adjustment module, which controls to adjust mould during laser switched laser wavelength
Block works, and changes the optical circuit path of laser.
7. tunable laser system according to claim 6, which is characterized in that further include feedback unit, the feedback
Member includes：
First spectroscope, first spectroscope receive the laser that is projected from optical path adjusting unit, and fraction of laser light is reflected into the
In two spectroscopes；
Second spectroscope, the laser that first spectroscope reflection comes are incident on optical detector and lock wave respectively by the second spectroscope
Device；
Optical detector, the optical detector are connect with processor unit, which is used for the power of detection light；
Wave device is locked, which connect with processor unit, which is used for the frequency of detection light.
8. tunable laser system according to claim 7, it is characterised in that：Further include the thermoelectricity being connect with laser
Refrigerator, the processor unit include the temperature control circuit being connect with thermoelectric cooler.
9. tunable laser system according to claim 7, it is characterised in that：The processor unit includes and semiconductor
The amplifier drive circuit of amplifier connection.
10. tunable laser system according to claim 1, it is characterised in that：The optical fiber is polarization maintaining optical fibre.
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| CN201511032480.0A CN105449506B (en) | 2015-12-31 | 2015-12-31 | A kind of tunable laser system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201511032480.0A CN105449506B (en) | 2015-12-31 | 2015-12-31 | A kind of tunable laser system |
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| CN105449506B true CN105449506B (en) | 2018-10-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106532431A (en) * | 2016-12-28 | 2017-03-22 | 尚华 | Laser generation light introduction equipment applied to human body |
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| US6842587B1 (en) * | 2000-03-30 | 2005-01-11 | Nortel Networks Limited | Use of amplified spontaneous emission from a semiconductor optical amplifier to minimize channel interference during initialization of an externally modulated DWDM transmitter |
| CN201118093Y (en) * | 2007-10-30 | 2008-09-17 | 武汉电信器件有限公司 | Tunable laser automatic control device based on lock wave |
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| CN105449506A (en) | 2016-03-30 |
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