CN111463648B - Low-jitter high-repetition-frequency supercontinuum light source - Google Patents
Low-jitter high-repetition-frequency supercontinuum light source Download PDFInfo
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- CN111463648B CN111463648B CN201910053956.0A CN201910053956A CN111463648B CN 111463648 B CN111463648 B CN 111463648B CN 201910053956 A CN201910053956 A CN 201910053956A CN 111463648 B CN111463648 B CN 111463648B
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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
- H01S3/10—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
- H01S3/1106—Mode locking
- H01S3/1109—Active mode locking
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1301—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/136—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity
- H01S3/137—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity for stabilising of frequency
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- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
A low-jitter high-repetition-frequency supercontinuum light source belongs to the technical field of laser, and aims at the defects of the prior art, an adjustable continuous laser source is connected with the optical input end of a Mach-Zehnder modulator, an arbitrary waveform generator is connected with the radio frequency end of the Mach-Zehnder modulator, the Mach-Zehnder modulator is connected with an erbium-doped fiber amplifier, the erbium-doped fiber amplifier is connected with a single-mode fiber, the single-mode fiber is connected with a wavelength division multiplexer, a Raman pump source is connected with the wavelength division multiplexer, the wavelength division multiplexer is connected with an optical coupler, the coupler is connected with another erbium-doped fiber amplifier, the optical coupler is connected with another optical coupler, the other erbium-doped fiber amplifier is connected with a high nonlinear fiber, the high nonlinear fiber is connected with a tunable optical filter, the tunable optical filter is connected with a light delay line, the light delay line is connected with another optical coupler, and the optical coupler, the erbium-doped fiber amplifier is connected with another high nonlinear fiber, and the high nonlinear fiber is connected with another tunable optical filter.
Description
Technical Field
The invention relates to a low-jitter high-repetition-frequency supercontinuum light source, and belongs to the technical field of lasers. The invention can be applied to the fields of space laser communication, biomedical imaging, spectroscopy and the like.
Background
Since the phenomenon of the supercontinuum in the optical fiber is discovered, the supercontinuum is widely applied to the fields of communication, biological imaging, spectroscopy and the like due to the abundant spectral components and coherence characteristics of the supercontinuum. Conventional supercontinuum light sources exhibit very severe pulse jitter due to nonlinear effects such as modulation instability in the fiber, which severely limits many applications like single pulse spectroscopy, microscopy, which are based on fast dynamic and non-repetitive measurements. The use of pulse triggering to control modulation instability in the fiber is an effective way to obtain low jitter supercontinuum.
At present, a passive mode-locked fiber laser is used for pumping a nonlinear fiber for generating a supercontinuum, but the repetition frequency of a supercontinuum pulse source obtained by the method is generally dozens of MHz, so that the supercontinuum pulse source cannot be used as a communication light source. The active mode-locked laser pump can improve the supercontinuum repetition frequency to GHz, and the realization of high-speed partially coherent space optical communication based on the supercontinuum repetition frequency also becomes possible. This lays the foundation for the future popularity of partially coherent optical communications, which is more advantageous in spatial channels.
Disclosure of Invention
Aiming at the defects of low repetition frequency and strong pulse jitter of the conventional supercontinuum, the invention provides a method for generating the supercontinuum based on the combination of a driving mode-locked laser and pulse triggering.
The invention adopts the following technical scheme:
the low-jitter high-repetition-frequency supercontinuum light source comprises an adjustable continuous laser source, an arbitrary waveform generator, a Mach-Zehnder modulator, a first erbium-doped fiber amplifier, a single-mode fiber, a Raman pumping source, a wavelength division multiplexer, a first optical coupler, a second erbium-doped fiber amplifier, a first high nonlinear fiber, a first tunable optical filter, an optical delay line, a second optical coupler, a third erbium-doped fiber amplifier, a second high nonlinear fiber and a second tunable optical filter, wherein the adjustable continuous laser source is connected with the optical input end of the Mach-Zehnder modulator, a radio-frequency electric signal sent by the arbitrary waveform generator is connected with the radio-frequency end of the Mach-Zehnder modulator, the optical output end of the Mach-Zehnder modulator is connected with the first erbium-doped fiber amplifier, the output end of the first erbium-doped fiber amplifier is connected with the single-mode fiber, the output end of the single-mode fiber is connected with the port A of the wavelength, the Raman pump source output end is connected with a wavelength division multiplexer port B, a wavelength division multiplexer port C is connected with a first optical coupler public port, a first coupler port D is connected with a second erbium-doped fiber amplifier, a first optical coupler port E is connected with a second optical coupler port G, the second erbium-doped fiber amplifier output end is connected with a first high nonlinear fiber, the first high nonlinear fiber output end is connected with a first tunable optical filter, the first tunable optical filter output end is connected with an optical delay line, the optical delay line output end is connected with a second optical coupler port F, the second optical coupler public end is connected with a third erbium-doped fiber amplifier, the third erbium-doped fiber amplifier output end is connected with a second high nonlinear fiber, and the second high nonlinear fiber is connected with a second tunable optical filter.
The invention has the beneficial effects that: the low-jitter high-repetition-frequency supercontinuum light source uses the active mode-locked laser to increase the supercontinuum repetition frequency from the traditional MHz to 4GHz, uses pulse triggering to greatly reduce the pulse jitter, greatly improves the practicability of the supercontinuum, and has the characteristics of high stability, simple structure and easy tuning.
In the technical scheme of the invention, the Mach-Zehnder modulator is adopted to carry out intensity modulation on the continuous light, so that the generated pulse repetition frequency can be adjusted to 4GHz, and the pulse jitter of the super-continuum spectrum is reduced by adopting a pulse triggering mode in the scheme of the invention.
The supercontinuum light source has the advantages of simple structure, easy integration, time domain pulse intensity jitter standard deviation lower than 0.1, and huge application potential in the fields of partial coherent space optical communication, spectroscopy, coherent light chromatography and the like.
Drawings
FIG. 1 is a diagram of a low jitter high repetition frequency supercontinuum structure according to the present invention.
FIG. 2 is a diagram of a supercontinuum pulse spectrum.
FIG. 3(a) is a diagram showing pulse jitter of a supercontinuum without a trigger mode, and FIG. 3 (b) is a diagram showing improvement of pulse jitter of a supercontinuum in a time domain after pulse triggering.
Detailed Description
The following describes embodiments of the present invention in detail with reference to the accompanying drawings.
As shown in fig. 1, the generation of the low-jitter high-repetition-frequency supercontinuum light source includes an adjustable continuous laser source 1, an arbitrary waveform generator 2, a mach-zehnder modulator 3, a first erbium-doped fiber amplifier 4, a single-mode fiber 5, a raman pump source 6, a wavelength division multiplexer 7, a first coupler 8, a second erbium-doped fiber amplifier 9, a first high-nonlinearity fiber 10, a first tunable optical filter 11, an optical delay line 12, a second coupler 13, a third erbium-doped fiber amplifier 14, a second high-nonlinearity fiber 15, and a second tunable optical filter 16. An adjustable continuous laser source 1 is connected with an optical input end of a Mach-Zehnder modulator 3 through an optical fiber, a radio-frequency electric signal sent by an arbitrary waveform generator 2 is connected with a radio-frequency end of the Mach-Zehnder modulator 3 through an SMA cable, an optical output end of the Mach-Zehnder modulator 3 is connected with a first erbium-doped fiber amplifier 4 through an optical fiber, an output end of the erbium-doped fiber amplifier 4 is connected with a single-mode fiber 5 through an optical fiber, an output end of the standard single-mode fiber 5 is connected with a port A of a wavelength division multiplexer 7 through an optical fiber, an output end of a pump Raman source 6 is connected with a port B of the wavelength division multiplexer 7 through an optical fiber, a port C of the wavelength division multiplexer 7 is connected with a common port of a first optical coupler 8 through an optical fiber, a port D of the first optical coupler 8 is connected with a port D of a second erbium-, the output end of the second erbium-doped fiber amplifier 9 is connected with the first high nonlinear fiber 10 through an optical fiber, the output end of the first high nonlinear fiber 10 is connected with the first tunable optical filter 11 through an optical fiber, the output end of the first tunable optical filter 11 is connected with the optical delay line 12 through an optical fiber, the output end of the optical delay line 12 is connected with the port F of the second optical coupler 13 through an optical fiber, the common end of the second optical coupler 13 is connected with the third erbium-doped fiber amplifier 14 through an optical fiber, the output end of the third erbium-doped fiber amplifier 14 is connected with the second high nonlinear fiber 15 through an optical fiber, and the second high nonlinear fiber 15 is connected with the second tunable optical filter 16 through an optical fiber.
The wave band of the adjustable continuous laser source 1 is C + L wave band.
The single mode fibre 5 was a 20km standard single mode fibre.
The wavelength division multiplexer 7 multiplexes wavelengths 1480nm and 1550 nm.
The amplified optical power of the three erbium-doped fiber amplifiers reaches more than 1W.
The first optical coupler 8 and the second optical coupler 13 are both 3dB couplers.
The nonlinear coefficients of the first high nonlinear optical fiber 10 and the second high nonlinear optical fiber 15 are 10.8W-1KM-1。
The first tunable optical filter 11 and the second tunable optical filter 16 have a C + L band.
The tunable continuous laser source 1 is turned on and the output power of the tunable continuous laser source 1 is adjusted to be suitable for the input power of the mach-zehnder modulator 3. And adjusting the duty ratio of a square wave signal sent by the arbitrary waveform generator 2, observing the stability of the output power of the modulator 3 and the output waveform of the oscilloscope, starting the first erbium-doped fiber amplifier 4, adjusting the power to be more than 1W, and observing the pulse repetition frequency to be 4GHz on the frequency spectrograph. Turning on the raman pump source 6 to connect it to the wavelength division multiplexer 7 and adjusting the output power to 1W achieves pulse compression, the pulse width can be seen compressed to 3ps on the pulse analyzer. The narrowed pulse is divided into two paths by a 3dB first coupler 8, one path is amplified to 1W by a second erbium-doped fiber amplifier 9, and then a first high nonlinear fiber 10 is pumped. The output end of the first high nonlinear optical fiber 10 is connected to a first tunable optical filter 11, and is coupled with the other path of the 3dB first coupler 8 at a second optical coupler 13 after passing through an optical delay line 12. The combined spectrum of the pump pulse and the trigger pulse is observed at the common end of the second optical coupler 13. Amplified to 1W by the third erbium-doped fiber amplifier 14, and the spectrogram and the output power of the nonlinear fiber can be observed at the output end of the second high nonlinear fiber 15. After passing through the tunable filter 16, the jitter can be observed by an oscilloscope after being detected by a photoelectric detector. The improvement of the supercontinuum pulse jitter can be seen on an oscilloscope by switching the second erbium doped fiber amplifier 9 on and off.
From fig. 2, it can be observed that the supercontinuum repetition frequency is 4 GHz.
FIG. 3(a) is a diagram of the pulse jitter of the supercontinuum when the pulse triggered mode is not used, and it can be seen that the pulse is greatly jittered due to various nonlinear effects in the optical fiber. After the pulse trigger is added, it can be seen from fig. 3 (b) that the pulse jitter of the supercontinuum is greatly reduced, and the pulse intensity of the whole pulse sequence is substantially equal. The invention is feasible based on the fact that the active mode-locked laser is combined with pulse triggering to generate the supercontinuum light source with low jitter and high repetition frequency. The invention of the light source provides a further development basis for a series of applications such as optical coherence tomography, partially coherent spatial light communication, spectral analysis and the like.
Claims (8)
1. The low-jitter high-repetition-frequency supercontinuum light source comprises an adjustable continuous laser source (1), an arbitrary waveform generator (2), a Mach-Zehnder modulator (3), a first erbium-doped fiber amplifier (4), a single-mode fiber (5), a Raman pump source (6), a wavelength division multiplexer (7), a first optical coupler (8), a second erbium-doped fiber amplifier (9), a first high-nonlinearity fiber (10), a first tunable optical filter (11), an optical delay line (12), a second optical coupler (13), a third erbium-doped fiber amplifier (14), a second high-nonlinearity fiber (15) and a second tunable optical filter (16), wherein the adjustable continuous laser source (1) is connected with the optical input end of the Mach-Zehnder modulator (3), and a radio-frequency electric signal sent by the arbitrary waveform generator (2) is connected with the radio-frequency end of the Mach-Zehnder modulator (3), the optical output end of a Mach-Zehnder modulator (3) is connected with a first erbium-doped fiber amplifier (4), the output end of the first erbium-doped fiber amplifier (4) is connected with a single-mode fiber (5), the output end of the single-mode fiber (5) is connected with a port A of a wavelength division multiplexer (7), the output end of a Raman pump source (6) is connected with a port B of the wavelength division multiplexer (7), a port C of the wavelength division multiplexer (7) is connected with a common port of a first optical coupler (8), a port D of the first coupler (8) is connected with a second erbium-doped fiber amplifier (9), a port E of the first optical coupler (8) is connected with a port G of a second optical coupler (13), the output end of the second erbium-doped fiber amplifier (9) is connected with a first high nonlinear fiber (10), the output end of the first high nonlinear fiber (10) is connected with a first tunable optical filter (11), and the output end of the first tunable optical filter (11) is connected with an optical delay line (12), the output end of the optical delay line (12) is connected with a port F of a second optical coupler (13), the common end of the second optical coupler (13) is connected with a third erbium-doped fiber amplifier (14), the output end of the third erbium-doped fiber amplifier (14) is connected with a second high nonlinear fiber (15), and the second high nonlinear fiber (15) is connected with a second tunable optical filter (16).
2. A low jitter high repetition frequency supercontinuum light source as claimed in claim 1, characterized in that the tunable continuous laser source (1) is in the C + L band.
3. A low jitter high repetition frequency supercontinuum light source according to claim 1, characterized in that the single mode fiber (5) is a 20km standard single mode fiber.
4. A low jitter high repetition frequency supercontinuum light source according to claim 1, characterized in that the wavelength division multiplexer (7) multiplexes wavelengths 1480nm and 1550 nm.
5. The low jitter high repetition frequency supercontinuum light source according to claim 1, characterized in that the amplified optical power of three erbium doped fiber amplifiers reaches more than 1W.
6. A low jitter high repetition frequency supercontinuum light source according to claim 1, characterized in that the first (8) and the second (13) optical couplers are 3dB couplers.
7. The low-jitter high-repetition-frequency supercontinuum light source according to claim 1, characterized in that the nonlinear coefficients of the first high-nonlinearity fiber (10) and the second high-nonlinearity fiber (15) are 10.8W-1KM-1。
8. The low-jitter high-repetition frequency supercontinuum light source according to claim 1, characterized in that the first tunable optical filter (11) and the second tunable optical filter (16) are in the C + L band.
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