CN206195145U - Multi-frequency-multiplication mode-locked laser based on micro-ring resonant cavity - Google Patents
Multi-frequency-multiplication mode-locked laser based on micro-ring resonant cavity Download PDFInfo
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- CN206195145U CN206195145U CN201621025478.0U CN201621025478U CN206195145U CN 206195145 U CN206195145 U CN 206195145U CN 201621025478 U CN201621025478 U CN 201621025478U CN 206195145 U CN206195145 U CN 206195145U
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Abstract
The utility model provides a frequency multiplication mode-locked laser based on micro-ring resonant cavity, includes and loops through first wavelength division multiplexer, erbium-doped gain fiber, second wavelength division multiplexer, optical isolator, polarization controller, four port micro-ring resonant cavities, output coupler and the optical delay line that intracavity single mode fiber connects, wherein two wavelength division multiplexer's input is provided with the pumping light source respectively. The utility model discloses the free spectral range that can the micro-ring resonant cavity of repetition frequency adjusts for the step length to promote application flexibility and robustness based on dissipation four-wave mixing efficiency mode-locked laser at present. The method has wide application prospect in the aspects of future ultra-high-speed optical communication systems, microwave photonics, optical analog-to-digital conversion and the like, and particularly has very important application in the fields of optical information processing, on-chip optical interconnection and the like which need accurate frequency multiplication optical clock signals.
Description
Technical field
The utility model is related to a kind of mode-locked laser, and in particular to a kind of superelevation weight based on dissipation four-wave mixing effect
Frequency mode-locked laser, more particularly relates to a kind of superelevation repetition mode-locked laser based on micro-ring resonant cavity, and its pulse rate
Can freely be adjusted as step-length with micro-ring resonant cavity Free Spectral Range in chamber.
Background technology
Usual high-speed optical pulse signal can adjust light wave generation, latter side by mode-locked laser and using high speed optoelectronic
Case is limited to optical modulator and electric signal generator bandwidth, and tens of GHzs, and its cost are can only achieve at present with speed
Lifting significantly increase.And mode-locked laser is without high-frequency electron device, it has simple structure, with low cost, stable
Property it is high the advantages of, optic communication, optical sensing, super continuous spectrums produce etc. technical research and industrial circle have it is particularly important should
With.Particularly the multiple frequence mode-locked laser of Gao Zhongying is in fields such as optic communication, high-resolution photon analog-to-digital conversion, frequency combs
There is particularly important application.
The repetition of usual optical fiber laser only has several million to tens megahertzs, is unfavorable for that it needs superelevation weight in optic communication etc.
Application in terms of frequency pulse.To lift the repetition of optical fiber mode locked laser, existing several solutions：One is by shortening laser
The chamber of device is long, the method for the mode spacing in improving laser chamber, and the light pulse of superelevation 10GHz repetitions can be obtained using the program,
But continue to shorten that chamber is long will be unable to obtain enough interacvity gains, therefore the light pulse of practicality cannot be produced, and its repetition with
The determination of laser cavity and lock, it is impossible to be adjusted.Second scheme is the mode-locked laser based on dissipation four-wave mixing effect
Device, such laser can realize the mode locking pulse of more than THz repetitions, but it often has many longitudinal mode unstability, it is impossible to real
Apply on border, although its repetition can be changed by adjusting the free spectral limit of intraluminal filter, but the essence of speed difficult to realize
True frequency multiplication.The third method is that, using the method for harmonic mode locking, the passive harmonic mode locking reported can produce tens of GHzs
Light pulse, active harmonic mode locking laser can even produce the light pulse of hundreds of GHzs, but harmonic mode locking laser
Easily disturbed by different harmonic modes, generation time is shaken and amplitude fluctuation, active mode locking laser is also limited in addition
Radiofrequency signal, high cost；The method can realize the frequency multiplication of pulse rate in theory, but realize its harmonic wave rank during superelevation repetition
Number is very high, is difficult to realize in practical operation, and extremely strict to control system requirement.
Utility model content
For optical information processing on optical communication system, piece to superelevation repetition optical signal, particularly can many times with speed
The demand of the optical signal of growth, the utility model provides the mode-locked laser that a kind of repetition based on micro-ring resonant cavity can double
Device, the repetition of its light pulse for producing can freely be adjusted with micro-ring resonant cavity Free Spectral Range as step-length, the mode-locked laser
Utensil has the advantages that simple structure, operates easily, without many longitudinal mode instability problems.
The technical solution of the utility model is：
A kind of multiple frequence mode-locked laser based on micro-ring resonant cavity, it is characterized in that, including is connected by single-mode fiber 7
The loop laser chamber that multiple optics are formed；The multiple optics includes fiber amplifier 1, optoisolator 2, polarization control
Device processed 3, four port micro-ring resonant cavities 4, optical delay line 6；Four port micro-ring resonant cavity 4 includes substrate 41, covering 42, first
Straight wave guide 43, the second straight wave guide 44 and disc waveguide 45；The two ends of first straight wave guide 43 are respectively the He of Input ports 46
Through ports 47；The two ends of second straight wave guide 44 are respectively Drop ports 49 and Add ports 48；Optical signal is from Input
Port 46 enters micro-ring resonant cavity 4, and the frequency for meeting the condition of resonance of micro-ring resonant cavity 4 is exported from Drop ports 49；The laser
The output of device be from Through ports 47 output fail be coupled into the part optical signals of micro-ring resonant cavity 4 completely.
Above-mentioned fiber amplifier 1, optoisolator 2, Polarization Controller 3, four port micro-ring resonant cavities 4, optical delay line 6 can be with
Head and the tail are sequentially connected.
Above-mentioned multiple optics also include beam splitter 5；The output of the laser is exported from Through ports 47
Fail to be coupled into the part optical signals of micro-ring resonant cavity 4 completely or extracted from loop laser chamber using beam splitter
Part optical signals.
Above-mentioned fiber amplifier 1, optoisolator 2, Polarization Controller 3, four port micro-ring resonant cavities 4, beam splitter 5, light
Delay line 6 can be sequentially connected from beginning to end.
Above-mentioned fiber amplifier 1 mixes bait optical amplifier for commercial short fibre；
Or, it is the semiconductor optical amplifier of high-gain；
Or, including one or two pump light source and the first wavelength division multiplexer 12, the er-doped gain light contacted successively
Fine 13, second wavelength division multiplexer 14；Wherein, pump light source output termination first wave division multiplexer 12 or second wavelength-division multiplex
The input of device 14, or two pump light source output ends connect the first wavelength division multiplexer 12 and the second wavelength division multiplexer 14 respectively
Input；The output end of the wavelength division multiplexer 14 of first wavelength division multiplexer 12 and second is respectively as the two of fiber amplifier 1
Terminate into loop laser chamber.
The light path of above-mentioned laser cavity is equal to N+L/M times of micro-ring resonant cavity single cycle light path, wherein：N, L and M are whole
Count and L and M can not reduce, it is M times of micro-ring resonant cavity Free Spectral Range that the multiple frequence mode-locked laser produces repetition speed
Mode locking pulse sequence.
The mode spacing of above-mentioned laser cavity is 0.5-1 times of micro-ring resonant cavity filtering bandwidth；The laser chamber is long to be protected
Demonstrate,prove each micro-ring resonant cavity resonance wave strong point only one of which laser cavity modes and form vibration；When laser cavity total optical length just
Equal to micro-ring resonant cavity optical length integral multiple when, laser produce repetition be equal to micro-ring resonant cavity Free Spectral Range light
Pulse train.
Above-mentioned pump light source for operation wavelength 980nm or 1480nm single mode semiconductor laser, its running parameter with mix
Erbium gain fibre 13 is matched；The wavelength-division scope of the wavelength division multiplexer is 980nm/1550nm or 1480nm/1550nm；It is described to mix
Erbium gain fibre 13 uses the Er-doped fiber or erbium-ytterbium co-doped fiber of high-dopant concentration, and length is 10-100 centimetres；Described many times
The gain media of frequency mode-locked laser is that erbium-doped fiber amplifier or erbium-ytterbium co-doped fiber amplifier or high-gain semiconductor light are put
Big device；The optoisolator is the optoisolator with tail optical fiber or space optoisolator；The Polarization Controller is mechanical polarization
Controller or the Polarization Controller based on slide；The space optoisolator can be embedded in the Polarization Controller based on slide；
The micro-ring resonant cavity is the non-linear micro-ring resonant cavity with four optical ports, its quality factor q ＞ 105；It is humorous that it constitutes micro-loop
The waveguide in chamber of shaking has weak negative dispersion coefficient；The beam splitter be the tapered fiber optic splitter of rubbish, planar optical waveguide beam splitter or
Space beam splitter；The beam splitter is used to be extracted from loop laser chamber the energy of 2%-80% as loop laser chamber
Output.
A kind of multiple frequence mode-locked laser production method based on micro-ring resonant cavity, comprises the following steps：
1) doped gain fiber 13 obtains pumping, produces spontaneous emission light；
2) optical signal one-way transmission in chamber；
3) regulation Polarization Controller 3 makes a polarization state phase one of light field polarization state and micro-ring resonant cavity 4 in laser cavity
Cause；
4) by adjusting the length of optical delay line 6 so that the light path of laser cavity is allowed to be equal to the single cycle of micro-ring resonant cavity 4
The integral multiple of light path, forms the light pulse signal of stabilization, and its repetition is consistent with the free spectral limit of micro-ring resonant cavity 4；
5) length of optical delay line 6 is further adjusted, the light path of laser cavity is equal to the single cycle light path of micro-ring resonant cavity 4
N+L/M times, wherein N, L and M then has M light pulse while following for integer and L and M can not reduce in micro-ring resonant cavity 4
Ring, laser will produce the M times of mode locking pulse sequence of micro-ring resonant cavity Free Spectral Range.
Above-mentioned mode locking pulse sequence be from Through ports output fail be coupled into the part of micro-ring resonant cavity completely
Optical signal or the part optical signals extracted from loop laser chamber using beam splitter.
Advantage of the present utility model is as follows：
1st, the micro-ring resonant cavity in the utility model laser is made by CMOS compatible technologies, is conducive to mass to make.
2nd, the other devices of the utility model laser are all general optical fibre device, all have been commercialized.Cost is very low
It is honest and clean.
3rd, the utility model laser uses micro-ring resonant cavity as mode-locking device, with extremely strong field enhancement factor and non-
Linear coefficient, can produce nonlinear effect in the case of lower-wattage, realize locked mode.
4th, the micro-ring resonant cavity in the utility model laser is also comb filter simultaneously, and with very high fine
Degree, helps to reduce the laser cavity modes number in each pass band width.
5th, the micro-ring resonant cavity in the utility model laser has two work(of nonlinear device and comb filter simultaneously
Can, the complexity of laser and the length of laser cavity are reduced, the mode spacing of laser is improved, so as to solve such lock
Many longitudinal mode instability problems of mode laser.
6th, the fundamental frequency of the utility model laser is determined by the Free Spectral Range of micro-ring resonant cavity, therefore its fundamental frequency signal
With very two-forty.
7th, the utility model laser utilizes the interaction of laser cavity modes and micro-ring resonant cavity resonance wavelength, to laser
The output wavelength of device is selected, and realizes that mode locking pulse repetition increases by step-length of fundamental frequency.
8th, the regulation of the utility model mode-locked laser pulse repetition only needs to adjust the length of laser cavity, that is, adjust laser cavity
The length of middle optical delay line, it is simple to operate.
9th, nonlinear dielectric and comb filter of the utility model laser by the use of micro-ring resonant cavity as system, without
Nonlinear optical fiber more long and discrete comb filter, are conducive to the system integration, it might even be possible to integrated on piece, meet modern light
System is to miniaturization and the trend of integrated development.
10th, the utility model laser is long to chamber has carried out optimization processing, makes only one of which at each micro-ring resonant wavelength
Laser cavity modes vibrate, and eliminate many longitudinal mode instability problems.
Brief description of the drawings
The structural representation of the multiple frequence mode-locked laser based on micro-ring resonant cavity that Fig. 1 is provided for the utility model；It is micro-
Annular resonant cavity is directly embedded into optical fibre ring gain cavity, and the chamber of optical fiber cavity is long can to carry out accurate adjustment by optical delay line.
Fig. 2 is the structural representation of the micro-ring resonant cavity that the utility model is used；
The spectrogram (a) and autocorrelator trace figure (b) of the fundamental frequency 49GHz mode locking pulses that Fig. 3 is measured for the utility model；
Fig. 4 is the pulse train waveform figure and eye pattern that the utility model oscillograph is measured, and test system is 50GHz bandwidth
Photodetector and 59GHz real-time oscilloscope；
The spectrogram (a) and autocorrelator trace figure of the three times fundamental frequency 147GHz mode locking pulses that Fig. 5 is measured for the utility model
(b)；
Six times of spectrograms (a) of fundamental frequency 294GHz mode locking pulses and autocorrelator trace figure that Fig. 6 is measured for the utility model
(b)；
Nine times of fundamental frequencies 441GHz mode locking pulses spectrogram (a) and autocorrelator trace figure that Fig. 7 is measured for the utility model
(b)；
Reference is as follows：
1- fiber amplifiers；The pump light sources of 11- first；The multiple device of the wavelength-divisions of 112- first；13- doped gain fibers；14- second
The multiple device of wavelength-division；The pump light sources of 15- second；2- optoisolators；3- Polarization Controllers；The port micro-ring resonant cavities of 4- tetra-；41- substrates；
42- coverings；The straight wave guides of 43- first；The straight wave guides of 44- second；45- disc waveguides；46-Input ports；47-Through ports；
48-Add ports；49-Drop ports；5- beam splitters；6- optical delay lines；7- single-mode fibers.
Specific embodiment
Fig. 1 is principle schematic diagram. of the present utility model, as illustrated, provided by the utility model humorous based on micro-loop
Shake chamber repetition can with micro-ring resonant cavity Free Spectral Range be the freely regulated mode-locked laser system of step-length include pass sequentially through
The first connected wavelength division multiplexer 12 of single-mode fiber 7, doped gain fiber 13, the second wavelength division multiplexer 14, optoisolator 2, partially
Shake controller 3, four port micro-ring resonant cavities 4, beam splitter 5 and optical delay line 6.Above-mentioned each device passes sequentially through single-mode fiber
It is connected, forms annular chamber, does not have particular/special requirement to the tandem of each device.
First pump light source 11, the second pump light source 15 are separately positioned on two inputs of wavelength division multiplexer.Usual pump
Pu source selection work wavelength is the single mode semiconductor laser of 980n.Precise control is carried out by the way that the chamber to laser is long, is made every
Only one of which laser cavity modes in individual micro-ring resonant cavity resonance passband, in this specific example, laser cavity is long about 2.2 meters.Need
It should be noted that what Fig. 1 was given is a kind of series system of the present utility model, in practice, to the order of each optics simultaneously
There is no particular/special requirement (by the first pump light source 11, the first wavelength division multiplexer 12, er-doped gain fibre 13, the second wavelength division multiplexer
14th, the second pump light source 15 constitutes fiber amplifier, for laser of the present utility model provides gain as an entirety).Separately
Outward, beam splitter 5 as the laser a way of output, also another way of output, i.e. laser can be from micro-
The through ports 47 of annular resonant cavity 4 directly export.
Effect of the above-mentioned each optical module in the utility model be：
First pump light source 11, the first wavelength division multiplexer 12, doped gain fiber 13, the second wavelength division multiplexer 14, second
Pump light source 15 constitutes a fiber amplifier, for laser of the present utility model provides gain, the part as an entirety
Can also be by the semiconductor optical amplification for mixing bait optical amplifier, erbium-ytterbium co-doped fiber amplifier or high-gain of short fiber length
Device is substituted.The number of pump light source can be one or two, the optical signal gain that be can be provided depending on amplifier.Pump light
The operation wavelength in source is the high power single mode semiconductor laser of 980nm or 1480nm, single mode semiconductor laser work ginseng
Number is matched with er-doped gain fibre, according to the power output of pump light source, can set one or two pump light source.Correspond to
The operation wavelength of pump light source, the wavelength-division scope of wavelength division multiplexer is 980nm/1550nm or 1480nm/1550nm.
Er-doped gain fibre uses the Er-doped fiber or erbium-ytterbium co-doped fiber of high-dopant concentration, and such as absorption coefficient is 110dB/
The Er-doped fiber of m@1530nm.The length of gain fibre is very short, generally only several tens cm.
The gain media of laser can be the shorter commercialization fiber amplifier of fiber lengths, such as erbium-doped fiber amplifier
Or erbium-ytterbium co-doped fiber amplifier etc..The gain media of laser can be commercialized high-gain semiconductor optical amplifier.
Optoisolator 2 is used to ensure laser signal one-way transmission in optic fiber ring-shaped cavity that the unidirectional laser generation of formation to be defeated
Go out.Optoisolator can be the optoisolator with tail optical fiber or space optoisolator.
The polarization state that Polarization Controller 3 is used to adjust laser signal in optic fiber ring-shaped cavity (makes the light in optic fiber ring-shaped cavity
Ripple is single polarization state), make the polarization state of the laser signal for inciding the input port 46 of micro-ring resonant cavity 4 and micro-ring resonant cavity 4
TE patterns or TM patterns are consistent, it is ensured that whole system list polarization state is operated.Polarization Controller be mechanical Polarization Controller or
Polarization Controller or other types of Polarization Controller based on slide.Space optoisolator can be embedded in the polarization based on slide
In controller.
Micro-ring resonant cavity 4 selects the resonance wavelength of laser, while as non-linear Jie as narrow linewidth comb filter
Matter, is also the mode-locking device of laser, produces cascade four-wave mixing effect, and each wave of oscillation is realized using nonlinear effect therein
PGC demodulation long.Micro-ring resonant cavity is one has the non-linear micro-ring resonant cavity of four optical ports, with nonlinear system high
Number.Four port micro-ring resonant cavities 4 include substrate 41, covering 42, the first straight wave guide 43, the second straight wave guide 44 and disc waveguide 45；
Disc waveguide 45 is coupled with the first straight wave guide 43 and the second straight wave guide 44 by evanescent wave respectively, and its spacing directly affects coupling
The intensity of conjunction, and then determine the quality factor of four port micro-ring resonant cavities 4；First straight wave guide 43 and the second straight wave guide 44 are symmetrically
It is arranged in the both sides of disc waveguide 45.The two ends of the first straight wave guide 43 are respectively Input ports 46 and Through ports 47；The
The two ends of two straight wave guides 44 are respectively Drop ports 49 and Add ports 48；Optical signal enters micro-ring resonant cavity from Input ports 46
4, the frequency for meeting the condition of resonance of micro-ring resonant cavity 4 is exported from Drop ports 49；The output of laser is from Through ports 47
Output fail be coupled into the part optical signals of micro-ring resonant cavity 4 completely.Four port micro-ring resonant cavities have high-quality-factor,
Usual Q ＞ 105.The waveguide for constituting micro-ring resonant cavity has weak negative dispersion coefficient.Four port micro-ring resonant cavities have free light high
Spectral limit, such as 50GHz.Four port micro-ring resonant cavities have two functions of comb filter and high non-linearity medium simultaneously.Laser
Device can be exported directly from the Through ports of micro-ring resonant cavity.Laser chamber is long should be short enough, it is ensured that each micro-ring resonant cavity
Resonance wave strong point only one of which laser cavity modes form vibration.The mode spacing of usual laser cavity is micro-ring resonant cavity filtering bandwidth
0.5-1 times, for example, a length of 2 meters of the chamber of laser, corresponding to Q=1.5 × 106Micro-ring resonant cavity.
Beam splitter 5 is used to be extracted from the output signal of micro-ring resonant cavity 4 part energy as whole laser
Output, beam splitter can be any type of beam splitter, such as optical fiber rubbish cone beam splitter, slab guide beam splitter.
Optical delay line is free space delay line, with high spatial resolution and delay precision, for accurate adjustment laser
The length in chamber, realizes the mode-locked laser pulse output of stabilization, while by adjusting the chamber regulation for realizing mode locking pulse repetition long.
The repetition of laser is directly adjusted by light delay.When total optical length of laser cavity is exactly equal to micro-ring resonant
During the integral multiple of chamber optical length, laser produces repetition to be equal to the light pulse sequence of micro-ring resonant cavity Free Spectral Range, when
When total optical length of laser cavity is equal to L+M/N times of micro-ring resonant cavity optical length, laser produces repetition to be equal to N times of micro-loop
The light pulse sequence of resonator Free Spectral Range, wherein L, M and N are all integer, and M and N can not reduce.Mode-locked laser system
Output end can also be set directly at the Through ports of micro-ring resonant cavity.
Micro-ring resonant cavity 4 in this example be it is a kind of by high nonlinear coefficient material make with weak Negative Dispersion Properties
High-quality-factor (Q~1.45 × 106) micro-ring resonant cavity, possess very strong light field enhancing ability (~9.14 × 107), while tool
There is a comb filtering characteristic of high-fineness, Fig. 2 is the structural representation of four port micro-ring resonant cavities 4, including substrate 41, covering
42nd, the first straight wave guide 43, the second straight wave guide 44 and disc waveguide 45 and Input ports 46, Through ports 47, Add ports
The port of 48 and Drop ports 49 4.The two ends of the first straight wave guide 43 are respectively Input ports 46 and Through ports 47, phase
Ying Di, the two ends of the second straight wave guide 44 are respectively Drop ports 49 and Add ports 48.Optical signal enters in a subtle way from Input ports 46
Annular resonant cavity 4, the frequency for meeting the condition of resonance of micro-ring resonant cavity 4 is exported from Drop ports 49, fails to be coupled into micro-loop completely
The part of resonator 4 exports from Through ports 47.
The principle of the mode-locked laser of adjustable repetition is as follows：
The power output of the first pump light source 11 and the second pump light source 15 is progressively increased, doped gain fiber 13 obtains pump
Pu, begins with spontaneous emission light generation, and optical signal one-way transmission in chamber is ensured by optoisolator 2, when the gain of optical signal surpasses
When crossing cavity loss, there will be continuous laser to produce, the frequency interval of each wavelength and the Free Spectral Range phase of micro-ring resonant cavity 4
Together.The now phase of each wavelength and unstable, the laser pulse generation without stabilization.Further increase pump power, in chamber
Energy will increase, and now the light energy in micro-ring resonant cavity 4 is greatly strengthened, and now adjust laser by optical delay line 6
The light path in chamber is allowed to be equal to the integral multiple of the single cycle light path of micro-ring resonant cavity 4, each resonance wavelength hair in micro-ring resonant cavity 4
Raw four-wave mixing effect, the phase of each oscillation wavelength is locked by four-wave mixing effect, while being coupled into micro-loop from laser cavity
The light pulse of resonator 4 overlaps with the light pulse in micro-ring resonant cavity, and phase is consistent, therefore is constantly strengthened, most
End form is into stable light pulse signal, and its repetition is consistent with the free spectral limit of micro-ring resonant cavity 4.Fig. 3 is the first pump light
The spectrogram (a) and autocorrelator trace of lock laser output when the power output of the pump light source 15 of source 11 and second is 200mW
Figure (b), its repetition is 49GHz.Fig. 4 is to be measured by 59GHz oscillographs after laser output is detected by the photodetector of 50GHz
Oscillogram and eye pattern.
The length of optical delay line 6 is further adjusted, the light path of laser cavity is equal to the single cycle light path of micro-ring resonant cavity 4
N+L/M times (N, L and M are integer), is now evenly distributed in micro-loop humorous from the light pulse of laser cavity injection micro-ring resonant cavity 4
Shake in each fragment in chamber, there is M light pulse to circulate simultaneously in micro-ring resonant cavity 4.Repetition corresponding to laser obtains M times
Lifting.Fig. 5 is that repetition is the spectrogram (a) of the mode locking pulse of 147GHz (Free Spectral Range of three times micro-ring resonant cavity 4)
With autocorrelator trace figure (b).Fig. 6 is that repetition is the mode locking pulse of 294GHz (six times of Free Spectral Ranges of micro-ring resonant cavity 4)
Spectrogram (a) and autocorrelator trace figure (b).Fig. 7 is that repetition is 441GHz (nine times of Free Spectral Ranges of micro-ring resonant cavity 4)
Mode locking pulse spectrogram (a) and autocorrelator trace figure (b).
In sum, the utility model proposes the repetition based on micro-ring resonant cavity can be with micro-ring resonant cavity free spectrum model
It is the freely regulated mode-locked laser system of step-length to enclose, and the repetition for solving the mode-locked laser based on dissipation four-wave mixing effect is straight
Connect and determined by the Free Spectral Range of intraluminal filter part, it is impossible to realize the shortcoming of regulation.The light pulse that the laser is produced
Repetition is directly adjusted by adjusting optical delay line in chamber, simple to operate.The laser repetition is accurate according to micro-loop
The integral multiple of the Free Spectral Range of resonator increases, and is needing optical information processing, the piece glazing of accurate frequency multiplication optical clock signal
There is particularly important application in the fields such as interconnection, in addition in following ultra high-speed optical communication system, Microwave photonics, optical analog to digital conversion
Etc. aspect be also with a wide range of applications.
Claims (9)
1. a kind of multiple frequence mode-locked laser based on micro-ring resonant cavity, it is characterised in that：Including connecting many by single-mode fiber (7)
The loop laser chamber that individual optics is formed；
The multiple optics includes that fiber amplifier (1), optoisolator (2), Polarization Controller (3), four port micro-loops are humorous
Shake chamber (4), optical delay line (6)；
Four port micro-ring resonant cavity (4) includes substrate (41), covering (42), the first straight wave guide (43), the second straight wave guide
And disc waveguide (45) (44)；
The two ends of first straight wave guide (43) are respectively Input ports (46) and Through ports (47)；The second straight ripple
The two ends for leading (44) are respectively Drop ports (49) and Add ports (48)；
Optical signal enters micro-ring resonant cavity (4) from Input ports (46), meet the frequency of micro-ring resonant cavity (4) condition of resonance from
Drop ports (49) export；
The output of the laser be from Through ports (47) output fail be coupled into micro-ring resonant cavity (4) completely
Part optical signals.
2. the multiple frequence mode-locked laser based on micro-ring resonant cavity according to claim 1, it is characterised in that：The optical fiber
Amplifier (1), optoisolator (2), Polarization Controller (3), four port micro-ring resonant cavities (4), optical delay line (6) head and the tail phase successively
Even.
3. the multiple frequence mode-locked laser based on micro-ring resonant cavity according to claim 1, it is characterised in that：It is the multiple
Optics also includes beam splitter (5)；The output of the laser is to fail complete coupling from Through ports (47) output
Close the part optical signals for entering micro-ring resonant cavity (4) or the part light letter extracted from loop laser chamber using beam splitter
Number.
4. the multiple frequence mode-locked laser based on micro-ring resonant cavity according to claim 3, it is characterised in that：The optical fiber
Amplifier (1), optoisolator (2), Polarization Controller (3), four port micro-ring resonant cavities (4), beam splitter (5), optical delay line
(6) it is sequentially connected from beginning to end.
5. the multiple frequence mode-locked laser based on micro-ring resonant cavity according to claim 4, it is characterised in that：
The beam splitter is the tapered fiber optic splitter of rubbish, planar optical waveguide beam splitter or space beam splitter；The smooth beam splitting
Device is used to be extracted from loop laser chamber the energy of 2%-80% as the output in loop laser chamber.
6. the multiple frequence mode-locked laser based on micro-ring resonant cavity according to any one of claim 1 to 5, its feature exists
In：
The fiber amplifier (1) mixes bait optical amplifier for commercial short fibre；
Or, it is the semiconductor optical amplifier of high-gain；
Or, including one or two pump light source and the first wavelength division multiplexer (12), the er-doped gain fibre contacted successively
(13), the second wavelength division multiplexer (14)；Wherein, pump light source output termination first wave division multiplexer (12) or the second wavelength-division
The input of multiplexer (14), or two pump light source output ends connect the first wavelength division multiplexer (12) respectively and the second wavelength-division is multiple
With the input of device (14)；The output end of first wavelength division multiplexer (12) and the second wavelength division multiplexer (14) is respectively as light
Access annular laser cavity in the two ends of fiber amplifier (1).
7. the multiple frequence mode-locked laser based on micro-ring resonant cavity according to claim 6, it is characterised in that：The laser
The light path in chamber is equal to N+L/M times of micro-ring resonant cavity single cycle light path, wherein：N, L and M are integer and L and M are irreducible
Point, it is the mode locking pulse sequence of M times of micro-ring resonant cavity Free Spectral Range that the multiple frequence mode-locked laser produces repetition speed.
8. the multiple frequence mode-locked laser based on micro-ring resonant cavity according to claim 7, it is characterised in that：The laser
The mode spacing in chamber is 0.5-1 times of micro-ring resonant cavity filtering bandwidth；The laser chamber is long to ensure each micro-ring resonant cavity
Resonance wave strong point only one of which laser cavity modes form vibration；When total optical length of laser cavity is exactly equal to micro-ring resonant cavity light
During the integral multiple of schoolmate's degree, laser produces repetition to be equal to the light pulse sequence of micro-ring resonant cavity Free Spectral Range.
9. the multiple frequence mode-locked laser based on micro-ring resonant cavity according to claim 8, it is characterised in that：
The pump light source is the single mode semiconductor laser of operation wavelength 980nm or 1480nm, and its running parameter increases with er-doped
Beneficial optical fiber (13) matching；
The wavelength-division scope of the wavelength division multiplexer is 980nm/1550nm or 1480nm/1550nm；The er-doped gain fibre
(13) using the Er-doped fiber or erbium-ytterbium co-doped fiber of high-dopant concentration, length is 10-100 centimetres；
The optoisolator is the optoisolator with tail optical fiber or space optoisolator；The Polarization Controller is mechanical polarization control
Device processed or the Polarization Controller based on slide；
The space optoisolator can be embedded in the Polarization Controller based on slide；
The micro-ring resonant cavity is the non-linear micro-ring resonant cavity with four optical ports, its quality factor q ＞ 105；It constitutes micro-loop
The waveguide of resonator has weak negative dispersion coefficient.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106229805A (en) * | 2016-08-31 | 2016-12-14 | 中国科学院西安光学精密机械研究所 | Multi-frequency-multiplication mode-locked laser based on micro-ring resonant cavity |
| CN111725693A (en) * | 2020-06-04 | 2020-09-29 | 中国科学院上海光学精密机械研究所 | High-power multi-single-frequency fiber laser frequency doubling system and method |
-
2016
- 2016-08-31 CN CN201621025478.0U patent/CN206195145U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106229805A (en) * | 2016-08-31 | 2016-12-14 | 中国科学院西安光学精密机械研究所 | Multi-frequency-multiplication mode-locked laser based on micro-ring resonant cavity |
| WO2018041126A1 (en) * | 2016-08-31 | 2018-03-08 | 中国科学院西安光学精密机械研究所 | Harmonic mode-locked laser based on micro-ring resonator |
| CN106229805B (en) * | 2016-08-31 | 2021-10-12 | 中国科学院西安光学精密机械研究所 | Multiple repetition frequency rate mode-locked laser based on micro-ring resonant cavity |
| CN111725693A (en) * | 2020-06-04 | 2020-09-29 | 中国科学院上海光学精密机械研究所 | High-power multi-single-frequency fiber laser frequency doubling system and method |
| CN111725693B (en) * | 2020-06-04 | 2021-07-06 | 中国科学院上海光学精密机械研究所 | High-power multi-single-frequency fiber laser frequency doubling system and method |
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