CN105633773B - A kind of ring cavity Q-switched pulse laser based on chirping phase-shift optical fiber grating - Google Patents
A kind of ring cavity Q-switched pulse laser based on chirping phase-shift optical fiber grating Download PDFInfo
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- CN105633773B CN105633773B CN201610160245.XA CN201610160245A CN105633773B CN 105633773 B CN105633773 B CN 105633773B CN 201610160245 A CN201610160245 A CN 201610160245A CN 105633773 B CN105633773 B CN 105633773B
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06712—Polarising fibre; Polariser
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
-
- 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
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
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Abstract
A kind of ring cavity Q-switched pulse laser based on fiber grating, belongs to fiber optic communication, instrument field.Pump light source (101) first passes around wavelength division multiplexer (102) into laser ring cavity structure, then the gain for the doped fiber (103) for being 2 meters by length, after optoisolator (104), the polarizer (105) and Polarization Controller (106), pass through the chirping phase-shift optical fiber grating mode filter based on piezoelectric ceramics being made of linear chirp optical fiber grating (107), piezoelectric ceramics (108) and electric signal generator (109).Signal in bandwidth range by circulator (110) and uniform fiber bragg grating (111) to reflect back into laser resonance intracavitary, finally from coupler (112) output laser pulse.The Q-switched pulse laser is mainly the AC signal for passing through electric signal generator (109) generation, and phase shift realization is periodically introducing on linear chirp optical fiber grating (107).Change the frequency of AC signal, the pulse laser of available difference repetition rate.
Description
Technical field
It is specifically a kind of based on chirping phase-shift optical fiber grating the present invention relates to fiber optic communication, instrument field
Ring cavity Q-switched pulse laser.
Background technique
Since first fiber grating in 1978 comes out, fiber grating is just since its superior performance, flexible design etc. are excellent
Point is applied to communication every field.Especially fiber grating has the two high clear superiorities of narrow bandwidth, reflectivity, determines light
Application of the fine grating in laser resonator, and the Q-switched pulse laser based on fiber grating has that structure is simple, repetition rate
High, the advantages that insertion loss is low, at low cost, therefore, to the research of the Q-switched pulse laser based on fiber grating increasingly by
The concern of domestic and foreign scholars.
When fiber grating is applied to Q-switched pulse laser, the outside that external modulation is carried out to fiber grating is generallyd use
Device includes: to utilize acoustic optical devices or acoustooptical effect (" Q-switching of an all-fiber laser by
acousto-optic modulation of a fiber Bragg grating,"Optics Express,vol.14,
Pp.1106-1112,2006/02/06 2006), magnetostrictive rod (" Q-switched all-fiber laser based on
magnetostriction modulation of a Bragg grating,"Optics Express,vol.13,
Pp.5046-5051,2005/06/27 2005) and piezoelectric ceramics (" All-Fiber Q-Switched Erbium-Doped
Fiber Ring Laser Using Phase-Shifted Fiber Bragg Grating,"Journal of
2008), to reach Lightwave Technology, vol.26, pp.945-951,2008/04/15 realize that adjusting laser is humorous
The purpose of the loss of vibration chamber, to obtain Q impulse.But when the production Q-switched pulse laser of Utilization plan one, in order to increase sound
The interactive influence of light, needs to corrode fiber grating, this just necessarily reduces the stability of Optical Maser System itself.
In addition, in general, laser resonator is by a fiber grating with high reflectivity and the frequency-selecting light with narrow band spectrum
Fine grating composition.When Utilization plan two and scheme three make the Q-switched pulse laser based on fiber grating, need will act as
The fiber grating of frequency selector or other kinds of filter are fixed, to fix its resonance wavelength, then stretch mangneto
Contracting stick or piezoelectric ceramics act in reflecting grating, periodically adjust its resonance wavelength and frequency-selecting grating alignment, generate laser
Pulse is still all difficult to control, pulse since the characteristic of magnetostrictive rod or piezoceramic material itself to be aligned each time
Laser output power is unstable.
Summary of the invention
The present invention is to provide one kind that Optical Maser System is stable and pulsed laser output power is stable and is based on chirp phase shift light
The ring cavity Q-switched pulse laser of fine grating.Scheme acts on linear chirp optical fiber grating using stacking-type piezoelectric ceramics, forms base
In the chirping phase-shift optical fiber grating mode filter of stacking-type piezoelectric ceramics, frequency spectrum when being not introduced into phase shift of the filter and introducing
The switching between frequency spectrum when π phase shift can generate AC signal by electric signal generator and be adjusted, and this programme can be real
Existing adjusting frequency range is 1KHz~20KHz.
The technical scheme is that
A kind of ring cavity Q-switched pulse laser based on chirping phase-shift optical fiber grating, it is characterised in that: the pulse laser packet
Include pump light source, wavelength division multiplexer, the doped fiber that length is 2 meters, optoisolator, the polarizer, Polarization Controller, linear chrip
Fiber grating, stacking-type piezoelectric ceramics, electric signal generator, optical circulator, the uniform optical fiber Bragg light that reflectivity is 99%
Grid, optical fiber 90:10 coupler.Specific on-link mode (OLM) are as follows:
Pump light source is connected with a port on the wavelength division multiplexer left side, and the port on the right of wavelength division multiplexer is with length
One end of 2 meters of doped fiber is connected, and length is that 2 meters of the other end of doped fiber is connected with wherein one end of optoisolator,
The other end of optoisolator is connected with wherein one end of the polarizer, wherein one end phase of the other end and Polarization Controller of the polarizer
Even, the other end of Polarization Controller is connected with linear chirp optical fiber grating.
One of side of stacking-type piezoelectric ceramics is sticked to the middle position on linear chirp optical fiber grating, stacking-type pressure
Two electrodes of electroceramics piece are connected with the positive and negative electrode of electric signal generator respectively, the friendship generated using electric signal generator
It flows signal and drives piezoelectric ceramic piece, form a kind of chirping phase-shift optical fiber grating mode filter based on stacking-type piezoelectric ceramics.
The other end of linear chirp optical fiber grating is connected with the No.1 port on the right of optical circulator, No. two ends of optical circulator
Mouth is connected with the uniform fiber bragg grating that reflectivity is 99%, and the uniform fiber Bragg gratings light that reflectivity is 99%
The other end of grid is hanging, and No. three ports on the optical circulator left side are connected with the port below optical fiber 90:10 coupler, optical fiber 90:
90% output port of the upper surface of 10 couplers is connected with second port on the wavelength division multiplexer left side, forms a ring of light
Road, laser output of 10% output port of the upper surface of optical fiber 90:10 coupler as Q-switched laser.
Chirping phase-shift optical fiber grating mode filter based on stacking-type piezoelectric ceramics, frequency spectrum have frequency when being not introduced into phase shift
Spectrum and two kinds of frequency spectrum when introducing π phase shift, the signal deciding that switching between both frequency spectrums is generated by electric signal generator.
The length be 2 meters doped fiber fibre core in equal doping with rare-earth ions, including ytterbium ion, erbium ion or thulium from
Son.
Change the frequency f for the AC signal that electric signal generator generates, frequency range is 1KHz≤f≤20KHz, can be obtained
Obtain the pulse laser of different repetition rates.
It is of the invention that the specific working principle is as follows:
The light that pump light source issues obtains gain after wavelength division multiplexer enters the doped fiber that length is 2 meters, then passes through
The polarizer and Polarization Controller are crossed, is formed by linear chirp optical fiber grating, stacking-type piezoelectric ceramics and electric signal generator
The chirping phase-shift optical fiber grating mode filter based on stacking-type piezoelectric ceramics.The chirping phase-shift optical fiber grating mode filter is not
Frequency spectrum when introducing phase shift is consistent with the frequency spectrum of normal linear chirped fiber grating, and optical signal cannot pass through from the filter；But
It is that it is narrow a narrowband occur when the middle position of chirping phase-shift optical fiber grating introduces π phase shift, in the transmission spectrum of the filter
Seam, may be implemented narrow-band filtering.Also, it, can when electric signal generator, which generates AC signal, acts on stacking-type piezoelectric ceramics
Periodically to introduce π phase shift on line style chirped fiber grating, to periodically adjust the intracavitary loss of laser resonance.Band
Signal passes through the reflection of circulator in width, exports via coupler, obtains adjustable Q laser pulse.
It is had the beneficial effect that possessed by the present invention:
The invention proposes a kind of ring cavity Q-switched pulse laser based on chirping phase-shift optical fiber grating.The adjusting Q pulse laser
Device using doped fiber as gain media, using in the polarizer and Polarization Controller control laser ring cavity structure polarization and
Loss is formed using the electric signal generator by stacking-type piezoelectric ceramics, linear chirp optical fiber grating and generation AC signal
Chirping phase-shift optical fiber grating mode filter based on stacking-type piezoelectric ceramics carries out wavelength selection.When electric signal generator generates friendship
When flowing signal and acting on linear chirp optical fiber grating, linear chirp optical fiber grating periodically generates phase shift, thus periodically
Adjust the intracavitary loss of laser resonance, obtain adjusting Q pulse laser.Ring cavity Q impulse based on chirping phase-shift optical fiber grating swashs
Light device has many advantages, such as that structure is simple, system is stable, power stability, suitable for optical fiber telecommunications system.Optical fiber is based on other
The Q-switched pulse laser of grating is compared, and the system that the present invention further improves the Q-switched pulse laser based on fiber grating is steady
Qualitative and pulsed laser output power stability.
Detailed description of the invention
A kind of structural schematic diagram of the ring cavity Q-switched pulse laser based on chirping phase-shift optical fiber grating of Fig. 1.
Fig. 2 is being not introduced into phase shift and is being introduced π phase based on the chirping phase-shift optical fiber grating mode filter of stacking-type piezoelectric ceramics
Spectrum diagram when shifting.
The exchange letter that Fig. 3 is generated based on the ring cavity Q-switched pulse laser of chirping phase-shift optical fiber grating in electric signal generator
Q impulse schematic diagram when number frequency f=1KHz.
The exchange letter that Fig. 4 is generated based on the ring cavity Q-switched pulse laser of chirping phase-shift optical fiber grating in electric signal generator
Q impulse schematic diagram when number frequency f=10KHz.
The exchange letter that Fig. 5 is generated based on the ring cavity Q-switched pulse laser of chirping phase-shift optical fiber grating in electric signal generator
Q impulse schematic diagram when number frequency f=20KHz.
Specific embodiment
1 to 5 pair of ring cavity Q-switched pulse laser based on chirping phase-shift optical fiber grating is further retouched with reference to the accompanying drawing
It states.
Embodiment one
A kind of ring cavity Q-switched pulse laser based on chirping phase-shift optical fiber grating, as shown in Figure 1, it is characterised in that: the tune
Q pulse laser includes that pump light source 101, wavelength division multiplexer 102, length are 2 meters of doped fibers 103, optoisolator 104, rise
Inclined device 105, Polarization Controller 106, linear chirp optical fiber grating 107, stacking-type piezoelectric ceramics 108, electric signal generator 109,
Optical circulator 110, the uniform fiber bragg grating 111 that reflectivity is 99%, optical fiber 90:10 coupler 112；Specific side of link
Formula are as follows:
Pump light source 101 is connected with a port 1021 on 102 left side of wavelength division multiplexer, 102 the right of wavelength division multiplexer
Port 1022 and length be 2 meters one end of doped fiber 103 be connected, the other end for the doped fiber 103 that length is 2 meters and
Wherein one end of optoisolator 104 is connected, and the other end of optoisolator 104 is connected with wherein one end of the polarizer 105, the polarizer
105 other end is connected with wherein one end of Polarization Controller 106, the other end and linearly chirped fiber of Polarization Controller 106
Grating 107 is connected.
One of side of stacking-type piezoelectric ceramics 108 is sticked to the middle position on linear chirp optical fiber grating 107, heap
Two electrodes of stack piezoelectric ceramic piece 108 are connected with the positive and negative electrode of electric signal generator 109 respectively, are sent out using electric signal
The AC signal that raw device generates drives piezoelectric ceramic piece, forms a kind of chirp phase shift optical fiber light based on stacking-type piezoelectric ceramics
Grid-type filter.
The other end of linear chirp optical fiber grating 107 is connected with the No.1 port 1101 on 110 the right of optical circulator, ring of light shape
No. two ports 1102 of device 110 are connected with the uniform fiber bragg grating 111 that reflectivity is 99%, and reflectivity is 99%
The other end of uniform optical fiber bragg grating 111 is hanging, No. three ports 1103 on 110 left side of optical circulator and optical fiber 90:
Port 1121 below 10 couplers 112 is connected, 90% output port 1122 of the upper surface of optical fiber 90:10 coupler 112 with
Second port 1023 on 102 left side of wavelength division multiplexer is connected, and forms the upper surface of an optical loop, optical fiber 90:10 coupler 112
Laser output of 10% output port 1123 as Q-switched laser.
Chirping phase-shift optical fiber grating mode filter based on stacking-type piezoelectric ceramics, frequency spectrum have frequency when being not introduced into phase shift
Compose 22 two kinds of frequency spectrum when 21 and introducing π phase shift, the signal that the switching between both frequency spectrums is generated by electric signal generator 109
It determines.
The length is that 2 meters of doped fiber is optical fiber in fibre core mixed with ytterbium ion.
Change the frequency f=1KHz for the AC signal that electric signal generator 109 generates, available repetition rate is 1KHz
Adjustable Q laser pulse, as a result as shown in Figure 3.
Embodiment two
A kind of ring cavity Q-switched pulse laser based on chirping phase-shift optical fiber grating, as shown in Figure 1, it is characterised in that: the tune
Q pulse laser includes that pump light source 101, wavelength division multiplexer 102, length are 2 meters of doped fibers 103, optoisolator 104, rise
Inclined device 105, Polarization Controller 106, linear chirp optical fiber grating 107, stacking-type piezoelectric ceramics 108, electric signal generator 109,
Optical circulator 110, the uniform fiber bragg grating 111 that reflectivity is 99%, optical fiber 90:10 coupler 112；Specific side of link
Formula are as follows:
Pump light source 101 is connected with a port 1021 on 102 left side of wavelength division multiplexer, 102 the right of wavelength division multiplexer
Port 1022 and length be 2 meters one end of doped fiber 103 be connected, the other end for the doped fiber 103 that length is 2 meters and
Wherein one end of optoisolator 104 is connected, and the other end of optoisolator 104 is connected with wherein one end of the polarizer 105, the polarizer
105 other end is connected with wherein one end of Polarization Controller 106, the other end and linearly chirped fiber of Polarization Controller 106
Grating 107 is connected.
One of side of stacking-type piezoelectric ceramics 108 is sticked to the middle position on linear chirp optical fiber grating 107, heap
Two electrodes of stack piezoelectric ceramic piece 108 are connected with the positive and negative electrode of electric signal generator 109 respectively, are sent out using electric signal
The AC signal that raw device generates drives piezoelectric ceramic piece, forms a kind of chirp phase shift optical fiber light based on stacking-type piezoelectric ceramics
Grid-type filter.
The other end of linear chirp optical fiber grating 107 is connected with the No.1 port 1101 on 110 the right of optical circulator, ring of light shape
No. two ports 1102 of device 110 are connected with the uniform fiber bragg grating 111 that reflectivity is 99%, and reflectivity is 99%
The other end of uniform optical fiber bragg grating 111 is hanging, No. three ports 1103 on 110 left side of optical circulator and optical fiber 90:
Port 1121 below 10 couplers 112 is connected, 90% output port 1122 of the upper surface of optical fiber 90:10 coupler 112 with
Second port 1023 on 102 left side of wavelength division multiplexer is connected, and forms the upper surface of an optical loop, optical fiber 90:10 coupler 112
Laser output of 10% output port 1123 as Q-switched laser.
Chirping phase-shift optical fiber grating mode filter based on stacking-type piezoelectric ceramics, frequency spectrum have frequency when being not introduced into phase shift
Compose 22 two kinds of frequency spectrum when 21 and introducing π phase shift, the signal that the switching between both frequency spectrums is generated by electric signal generator 109
It determines.
The length is that 2 meters of doped fiber is optical fiber in fibre core mixed with erbium ion.
Change the frequency f=10KHz for the AC signal that electric signal generator 109 generates, available repetition rate is
The adjustable Q laser pulse of 10KHz, as a result as shown in Figure 4.
Embodiment three
A kind of ring cavity Q-switched pulse laser based on chirping phase-shift optical fiber grating, as shown in Figure 1, it is characterised in that: the tune
Q pulse laser includes that pump light source 101, wavelength division multiplexer 102, length are 2 meters of doped fibers 103, optoisolator 104, rise
Inclined device 105, Polarization Controller 106, linear chirp optical fiber grating 107, stacking-type piezoelectric ceramics 108, electric signal generator 109,
Optical circulator 110, the uniform fiber bragg grating 111 that reflectivity is 99%, optical fiber 90:10 coupler 112；Specific side of link
Formula are as follows:
Pump light source 101 is connected with a port 1021 on 102 left side of wavelength division multiplexer, 102 the right of wavelength division multiplexer
Port 1022 and length be 2 meters one end of doped fiber 103 be connected, the other end for the doped fiber 103 that length is 2 meters and
Wherein one end of optoisolator 104 is connected, and the other end of optoisolator 104 is connected with wherein one end of the polarizer 105, the polarizer
105 other end is connected with wherein one end of Polarization Controller 106, the other end and linearly chirped fiber of Polarization Controller 106
Grating 107 is connected.
One of side of stacking-type piezoelectric ceramics 108 is sticked to the middle position on linear chirp optical fiber grating 107, heap
Two electrodes of stack piezoelectric ceramic piece 108 are connected with the positive and negative electrode of electric signal generator 109 respectively, are sent out using electric signal
The AC signal that raw device generates drives piezoelectric ceramic piece, forms a kind of chirp phase shift optical fiber light based on stacking-type piezoelectric ceramics
Grid-type filter.
The other end of linear chirp optical fiber grating 107 is connected with the No.1 port 1101 on 110 the right of optical circulator, ring of light shape
No. two ports 1102 of device 110 are connected with the uniform fiber bragg grating 111 that reflectivity is 99%, and reflectivity is 99%
The other end of uniform optical fiber bragg grating 111 is hanging, No. three ports 1103 on 110 left side of optical circulator and optical fiber 90:
Port 1121 below 10 couplers 112 is connected, 90% output port 1122 of the upper surface of optical fiber 90:10 coupler 112 with
Second port 1023 on 102 left side of wavelength division multiplexer is connected, and forms the upper surface of an optical loop, optical fiber 90:10 coupler 112
Laser output of 10% output port 1123 as Q-switched laser.
Chirping phase-shift optical fiber grating mode filter based on stacking-type piezoelectric ceramics, frequency spectrum have frequency when being not introduced into phase shift
Compose 22 two kinds of frequency spectrum when 21 and introducing π phase shift, the signal that the switching between both frequency spectrums is generated by electric signal generator 109
It determines.
The length is that 2 meters of doped fiber is optical fiber in fibre core mixed with thulium ion.
Change the frequency f=20KHz for the AC signal that electric signal generator 109 generates, available repetition rate is
The adjustable Q laser pulse of 20KHz, as a result as shown in Figure 5.
Claims (2)
1. a kind of ring cavity Q-switched pulse laser based on chirping phase-shift optical fiber grating, it is characterised in that:
The pulse laser includes pump light source (101), wavelength division multiplexer (102), the doped fiber (103) that length is 2 meters, light
Isolator (104), the polarizer (105), Polarization Controller (106), linear chirp optical fiber grating (107), stacking-type piezoelectric ceramics
(108), electric signal generator (109), optical circulator (110), reflectivity be 99% uniform fiber bragg grating (111),
Optical fiber 90:10 coupler (112), specific on-link mode (OLM) are as follows:
Pump light source (101) is connected with a port (1021) on wavelength division multiplexer (102) left side, wavelength division multiplexer (102)
The port (1022) on the right is connected with the one end for the doped fiber (103) that length is 2 meters, the doped fiber (103) that length is 2 meters
The other end be connected with wherein one end of optoisolator (104), the other end of optoisolator (104) and the polarizer (105) its
Middle one end is connected, and the other end of the polarizer (105) is connected with wherein one end of Polarization Controller (106), Polarization Controller (106)
The other end be connected with linear chirp optical fiber grating (107)；
One of side of stacking-type piezoelectric ceramics (108) is sticked to the middle position on linear chirp optical fiber grating (107), heap
Two electrodes of stack piezoelectric ceramics (108) are connected with the positive and negative electrode of electric signal generator (109) respectively, utilize electric signal
The AC signal that generator generates drives piezoelectric ceramic piece, forms a kind of chirping phase-shift optical fiber grating type based on piezoelectric ceramics
Filter；
The other end of linear chirp optical fiber grating (107) is connected with the No.1 port (1101) on the right of optical circulator (110), the ring of light
No. two ports (1102) of shape device (110) are connected with the uniform fiber bragg grating (111) that reflectivity is 99%, and reflectivity
The other end for 99% uniform optical fiber bragg grating (111) is hanging, No. three ports on optical circulator (110) left side
(1103) it is connected with the port (1121) of optical fiber 90:10 coupler (112) below, the upper surface of optical fiber 90:10 coupler (112)
90% output port (1122) is connected with second port (1023) on wavelength division multiplexer (102) left side, forms a ring of light
Road, laser output of 10% output port (1123) of the upper surface of optical fiber 90:10 coupler (112) as Q-switched laser；
Chirping phase-shift optical fiber grating mode filter based on stacking-type piezoelectric ceramics, frequency spectrum have frequency spectrum when being not introduced into phase shift
(21) and introduce π phase shift when (22) two kinds of frequency spectrum, what the switching between both frequency spectrums was generated by electric signal generator (109)
Signal deciding.
2. a kind of ring cavity Q-switched pulse laser based on chirping phase-shift optical fiber grating according to claim 1, feature exist
In:
Equal doping with rare-earth ions in the fibre core for the doped fiber (103) that the length is 2 meters, including ytterbium ion, erbium ion or thulium
Ion；
Change the frequency f for the AC signal that electric signal generator (109) generate, frequency range is 1KHz≤f≤20KHz, can be with
Obtain the pulse laser of different repetition rates.
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| US11233372B2 (en) | 2019-06-25 | 2022-01-25 | Lumentum Operations Llc | Femtosecond pulse stretching fiber oscillator |
| CN110687734A (en) * | 2019-10-18 | 2020-01-14 | 北方工业大学 | Photon multiple frequency ultrahigh radio frequency signal oscillator |
| CN112422194B (en) * | 2020-11-19 | 2022-02-08 | 北方工业大学 | All-optical network node picosecond pulse signal relative time difference corrector |
| CN113794519A (en) * | 2021-06-24 | 2021-12-14 | 北京信息科技大学 | Tunable multiple frequency millimeter wave generator based on PS-CFBG |
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