CN110061410B - Mode-locked oscillator - Google Patents
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- CN110061410B CN110061410B CN201910369582.3A CN201910369582A CN110061410B CN 110061410 B CN110061410 B CN 110061410B CN 201910369582 A CN201910369582 A CN 201910369582A CN 110061410 B CN110061410 B CN 110061410B
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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
- H01S3/06716—Fibre compositions or doping with active elements
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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
- H01S3/06754—Fibre 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
- H01S3/10061—Polarization control
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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
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Abstract
The application relates to a mode-locked oscillator, which comprises at least two amplifiers, wherein the amplifiers are connected end to form an optical signal loop, and are used for amplifying pulse signals transmitted in the optical signal loop; either amplifier includes a modulator; the modulator is used for modulating the pump light of the corresponding amplifier and inputting the modulated pump light to the optical signal loop; the modulated pump light introduces noise in an optical signal loop, and the noise is transmitted for a plurality of circles after oscillation starting to form a pulse signal; at least two filters connected into the optical signal loop; the filter is used for filtering the pulse signal transmitted in the optical signal loop; an isolator connected to the optical signal loop; the isolator is used for limiting the transmission direction of the pulse signal transmitted in the optical signal loop; a coupler connected to the optical signal loop; the coupler is used for coupling and outputting the pulse signals transmitted in the optical signal loop, and the pulse signal coupler is simple in structure and capable of obtaining pulses with high energy and high peak power and running stably.
Description
Technical Field
The application relates to the technical field of lasers, in particular to a mode-locked oscillator.
Background
The mode locking technology is a technology for generating laser pulses in a very short time in optics, the length of the pulses can reach picoseconds or even femtoseconds, the theoretical basis of the mode locking technology is that fixed phase relations are introduced into different modes in a laser resonant cavity, and the generated laser is called phase-locked laser or mode-locked laser.
At present, an oscillator which can obtain high-stability, high-energy and high-peak power pulse, such as a mamyshiev mode-locked oscillator, is designed and manufactured by using the theory, however, in the implementation process, the inventor finds that at least the following problems exist in the conventional technology: the traditional mode-locked oscillator has a complex structure and high production cost.
Disclosure of Invention
Therefore, it is necessary to provide a mode-locked oscillator aiming at the problems of complex structure and high production cost of the traditional mode-locked oscillator.
In order to achieve the above object, in one aspect, an embodiment of the present application provides a mode-locked oscillator, including:
the optical signal loop is formed by connecting at least two amplifiers end to end, and the amplifiers are used for amplifying pulse signals transmitted in the optical signal loop; wherein any amplifier comprises a modulator; the modulator is used for modulating the pump light of the corresponding amplifier and inputting the modulated pump light to the optical signal loop; the modulated pump light introduces noise in an optical signal loop, and the noise is transmitted for a plurality of circles after oscillation starting to form a pulse signal;
at least two filters connected into the optical signal loop; the filter is used for filtering the pulse signal transmitted in the optical signal loop; wherein, an amplifier is arranged between adjacent filters; the central wavelengths of the filters are different;
an isolator connected to the optical signal loop; the isolator is used for limiting the transmission direction of the pulse signal transmitted in the optical signal loop;
a coupler connected to the optical signal loop; the coupler is used for coupling out the pulse signal transmitted in the optical signal loop.
In one embodiment, the bandwidths of the filters do not overlap.
In one embodiment, the center wavelength of each filter is set according to a preset rule; the predetermined rule is to decrease by 10 nm in sequence along the direction of one pulse signal cycle starting from the amplifier containing the modulator.
In one embodiment, the filter is a 5 nanometer bandwidth filter.
In one embodiment, the number of amplifiers is the same as the number of filters.
In one embodiment, the amplifier comprises a pump source, a wavelength division multiplexer, and a doped fiber;
the pumping source is connected with the wavelength division multiplexer; the wavelength division multiplexer and the doped optical fiber are sequentially and alternately connected to form an optical signal loop;
the modulator is connected between the corresponding pump source and the wavelength division multiplexer.
In one embodiment, the doped fiber is an ytterbium-doped fiber, a thulium-doped fiber, or an erbium-doped fiber.
In one embodiment, the pump source is a 980 nm pump source for ytterbium-doped and erbium-doped fibers or a 1550 nm pump source for thulium-doped fibers.
In one embodiment, the optical fiber further comprises at least two micro-nano optical fibers;
and each micro-nano optical fiber is respectively connected to the optical signal loop, wherein one amplifier and one filter are arranged between every two adjacent micro-nano optical fibers.
One end of the micro-nano optical fiber is connected with the corresponding doped optical fiber, and the other end of the micro-nano optical fiber is connected with the corresponding filter.
In one embodiment, the system further comprises a polarization controller;
the polarization controller is connected into the optical signal loop.
One of the above technical solutions has the following advantages and beneficial effects:
this application forms the optical signal loop through two at least amplifiers end to end, the amplifier circularly amplifies the pulse signal in the optical signal loop, utilize the modulator to let this application mode locking oscillator start to vibrate, utilize two at least wave filters to circularly carry out the filtering to the pulse signal in the optical signal loop, and guarantee through the isolator that the pulse signal of optical signal loop is towards a direction transmission, finally utilize the coupler to export the pulse signal coupling in the optical signal loop all the way, obtain the high energy of steady operation, the pulse of high peak power, this application mode locking oscillator simple structure, easily set up, and can acquire the high energy of steady operation, the pulse of high peak power.
Drawings
FIG. 1 is a schematic diagram of a first configuration of a mode locked oscillator according to an embodiment;
FIG. 2 is a schematic diagram of a first configuration of an amplifier in one embodiment;
FIG. 3 is a second schematic diagram of an embodiment of an amplifier;
FIG. 4 is a diagram illustrating a second configuration of a mode locked oscillator according to an embodiment;
fig. 5 is a schematic diagram of a third structure of the mode locked oscillator according to an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present. The terms "one end," "the other end," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In order to solve the problems of complicated structure and high production cost of the conventional mode-locked oscillator, in one embodiment, as shown in fig. 1, there is provided a mode-locked oscillator, including:
at least two amplifiers 11 connected end to form an optical signal loop, each amplifier 11 being configured to amplify a pulse signal transmitted in the optical signal loop; wherein any of the amplifiers 11 includes a modulator 111; the modulator 111 is configured to modulate the pump light of the corresponding amplifier 11, and input the modulated pump light to the optical signal loop; the modulated pump light introduces noise in an optical signal loop, and the noise is transmitted for a plurality of circles after oscillation starting to form a pulse signal;
at least two filters 13 connected into the optical signal loop; the filter 13 is used for filtering the pulse signal transmitted in the optical signal loop; wherein, an amplifier 11 is arranged between adjacent filters 13; the center wavelengths of the filters 13 are different;
an isolator 15 connected to the optical signal loop, wherein the isolator 15 is used for limiting the transmission direction of the pulse signal transmitted in the optical signal loop;
and a coupler 17 connected into the optical signal loop, wherein the coupler 17 is used for coupling out the pulse signal transmitted in the optical signal loop.
It should be noted that the amplifier is configured to amplify the pulse signal transmitted in the optical signal loop, and specifically, the amplification processing is to provide a gain for the pulse signal, so that the spectrum of the pulse signal is broadened, and the energy of the pulse signal is increased, so as to ensure the quality of the pulse signal transmitted in the optical signal loop. The optical signal loop is a transmission loop formed by connecting amplifiers end to end, and the pulse signals are circularly processed by the amplifiers.
Further, one of the amplifiers includes a modulator for modulating the pump light. The specific modulation process is as follows: the modulator modulates the pump light, noise is added to the time domain of a continuous optical signal running in an optical signal loop, when the noise is large enough at a certain moment randomly and after gain and nonlinear effect, the spectrum broadening amount of the continuous optical signal added with the noise enables the continuous optical signal to pass through the whole optical signal loop, the mode-locked oscillator obtains pulse oscillation, then the pulse is processed by devices such as amplifiers and filters, the spectrum of the pulse can be broadened, the intensity of the pulse can be increased, the pulse width of the pulse can be narrowed, and a pulse signal with high peak power can be obtained.
In one example, as shown in fig. 2, amplifier 11 includes a pump source 113, a wavelength division multiplexer 115, and a doped fiber 117; the pumping source 113 is connected with a wavelength division multiplexer 115; the wavelength division multiplexer 115 and the doped optical fiber 117 are sequentially and alternately connected to form an optical signal loop; the modulator 111 is connected between the corresponding pump source 113 and the wavelength division multiplexer 115.
The pumping source is used for exciting the laser working substance and pumping the activated particles from a ground state to a high energy level so as to realize the population inversion, and different excitation modes and excitation devices can be adopted according to different operating conditions of the laser working substance and the laser, such as optical excitation (optical pumping), gas discharge excitation, chemical excitation, nuclear energy excitation and the like. Further, the pump sources of different center wavelengths may be selected according to particular needs, and in one example, the pump sources are 980 nm pump sources corresponding to ytterbium-doped fibers and erbium-doped fibers. In another example, the pump source is a pump source corresponding to 1550 nm of a thulium doped fiber.
Wavelength division multiplexers are used to combine a series of optical signals carrying information but differing in wavelength into a single optical signal that is transmitted along a single optical fiber. The doped optical fiber is a special optical fiber which is doped with rare earth elements into a quartz glass substrate of a conventional transmission optical fiber, and the conventional optical fiber becomes an active optical fiber with an amplification function after being doped with the rare earth elements, so that the doped optical fiber passing through a pumping source can generate laser with corresponding wave bands or amplify pulse signals with corresponding wave bands transmitted in the doped optical fiber, and further, the doped optical fiber doped with different rare earth elements can generate laser with different wave bands and has an amplification function on the pulse signals with different wave bands. In one example, the doped fiber is an ytterbium-doped fiber, a thulium-doped fiber, or an erbium-doped fiber. The ytterbium-doped fiber can obtain 1.0 micron pulse signals, the thulium-doped fiber can obtain 1.6-2.0 micron pulse signals, and the erbium-doped fiber can obtain 1.5 micron pulse signals.
In yet another example, as shown in fig. 3, the mode-locked oscillator further includes at least two micro-nano fibers 119; each micro-nano optical fiber 119 is connected to an optical signal loop, wherein an amplifier 11 and a filter 13 are arranged between adjacent micro-nano optical fibers 119. Furthermore, the number of the micro-nano optical fibers is equal to the number of the amplifiers. The micro-nano fiber has a small fiber core diameter and a high nonlinear coefficient, so that a pulse signal passing through the micro-nano fiber can accumulate a strong nonlinear effect (wherein the main effect is a self-phase modulation effect). Under the action of the self-phase modulation effect, the frequency spectrum of the pulse signal transmitted in the self-phase modulation effect is broadened, so that the frequency spectrum range of the pulse signal can cover the filtering range of a next filter, the power consumption of a pumping source can be reduced, and the energy consumption in the process of generating the pulse signal with high energy and high peak power is reduced.
The filter is used for filtering the spectrum of the pulse signal, and filters with mutually non-overlapping central wavelengths are arranged in the oscillator to screen the pulse signal with high peak power so as to enable the pulse signal to oscillate in the optical signal loop (the pulse signal with high peak power can enable the spectrum to be widened to be wide enough through gain and nonlinear effect, can pass through each filter and oscillate in the optical signal loop), and enable the pulse with small intensity to be lost. The filter filters out signals outside the filtering range, which is determined by the center wavelength and bandwidth of the filter. At least one filter is connected to the signal output end of each amplifier, the pulse signals output by the amplifiers are filtered, and the filtered pulse signals are transmitted to the next amplifier. The central wavelengths of the filters in the mode-locked oscillator are different, and the transmission of continuous optical signals in an optical signal loop can be inhibited, so that the mode-locked oscillator is favorable for generating pulse signals with high energy and high peak power. The number of amplifiers is the same as the number of filters, i.e. one filter is assigned to one amplifier. In one example, the bandwidths of the filters do not overlap. That is, the filter ranges of the filters are different from each other and do not overlap with each other, so that a pulse signal having a high peak power can be generated.
In a further example, the center wavelength of each filter is set in a preset rule; the preset rule is that an amplifier containing a modulator is taken as a starting point, 10 nanometers are sequentially reduced along the direction of one pulse signal cycle, and through a large number of experiments, filters with central wavelengths different by 10 nanometers are selected, so that the oscillation starting can be easily realized, the signal-to-noise ratio of the pulse signal can be effectively improved, and stable high-peak power pulses can be obtained. In the direction of one cycle of the pulse signal, the pulse signal starts from the amplifier including the modulator, and returns to the amplifier after one cycle. The bandwidth of the filter may be selected according to actual requirements, and in one example, the filter is a 5 nm bandwidth filter.
The isolator is used for limiting the transmission direction of the pulse signals transmitted in the optical signal loop, so that the pulse signals are ensured to be transmitted towards one direction in the optical signal loop, and the generation of pulses with high energy and high peak power is facilitated.
The coupler is used for coupling the pulse signal in the optical signal loop out of one path for output to obtain a pulse with high energy and high peak power. In one example, the coupler can be 50/50, 30/70 or 20/80 ratio coupler, 50/50 ratio coupler, namely 1:1 coupler, which divides the optical signal into two paths of same optical signals according to the ratio of 1: 1; an 30/70 ratio coupler, namely a 3:7 coupler, which divides the optical signal into two optical signals according to the ratio of 3: 7; an 20/80 ratio coupler, a 1:4 coupler, splits an optical signal into two optical signals in a 1:4 ratio. Specifically, the coupler couples and outputs a pulse signal before an amplifier comprising a modulator through the coupler, and a pulse with high energy and high peak power is obtained.
In each embodiment of the mode-locked oscillator, an optical signal loop is formed by connecting at least two amplifiers end to end, the amplifiers cyclically amplify pulse signals in the optical signal loop, the modulator is used for enabling the mode-locked oscillator to start oscillation, at least two filters cyclically filter the pulse signals in the optical signal loop, the isolator is used for ensuring that the pulse signals in the optical signal loop are transmitted towards one direction, and finally the coupler is used for coupling the pulse signals in the optical signal loop to output all the way, so that high energy and high peak power pulses in stable operation are obtained.
In one embodiment, as shown in fig. 4, at least two amplifiers 11 are connected end to form an optical signal loop, and each amplifier 11 is configured to amplify a pulse signal transmitted in the optical signal loop; wherein any of the amplifiers 11 includes a modulator 111; either amplifier 11 includes a modulator 111; the modulator 111 is configured to modulate the pump light of the corresponding amplifier 11, and input the modulated pump light to the optical signal loop; the modulated pump light introduces noise in an optical signal loop, and the noise is transmitted for a plurality of circles after oscillation starting to form a pulse signal;
at least two filters 13 connected into the optical signal loop; the filter 13 is used for filtering the pulse signal transmitted in the optical signal loop; wherein, an amplifier 11 is arranged between adjacent filters 13; the center wavelengths of the filters 13 are different;
at least two micro-nano optical fibers 119; each micro-nano optical fiber 119 is respectively connected with an optical signal loop, wherein an amplifier 11 and a filter 13 are arranged between every two adjacent micro-nano optical fibers 119;
an isolator 15 connected to the optical signal loop for defining a transmission direction of the pulse signal transmitted in the optical signal loop;
a coupler 17 connected to the optical signal loop for coupling out the pulse signal transmitted in the optical signal loop;
further comprising a polarization controller 19; the polarization controller 19 is connected into the optical signal loop.
It should be noted that the polarization controller is used to optimize the polarization state of the pulse signal in the optical signal loop, thereby optimizing the quality of the output pulse signal.
In the embodiments of the mode-locked oscillator, the polarization controller is used to optimize the pulse signal in the optical signal loop, thereby ensuring that the pulse with high energy and high peak power is obtained.
To further understand the structure and operation principle of the mode-locked oscillator of the present application, a specific embodiment is described, and as shown in fig. 5, the mode-locked oscillator includes:
the first amplifier comprises a first 980 nm pumping source, a modulator, a first wavelength division multiplexer and a first ytterbium-doped fiber;
the second amplifier comprises a second 980 nm pumping source, a second wavelength division multiplexer and a second ytterbium-doped fiber;
the optical fiber comprises a first micro-nano optical fiber and a second micro-nano optical fiber;
the center wavelength of the first filter is 1065 nanometers, and the bandwidth of the first filter is 5 nanometers;
the center wavelength of the second filter is 1055 nanometers, and the bandwidth is 5 nanometers;
the mode-locked oscillator further comprises a coupler of an isolator, a polarization controller and 50/50;
the first wavelength division multiplexer, the first ytterbium-doped optical fiber, the isolator, the first micro-nano optical fiber, the first filter, the second wavelength division multiplexer, the second ytterbium-doped optical fiber, the polarization controller, the second micro-nano optical fiber, the 50/50 coupler and the second filter are sequentially connected end to form an optical signal loop; the first 980 nm pumping source is connected with the first wavelength division multiplexer through a modulator; and the second 980 nm pump source is connected with the second wavelength division multiplexer.
The working principle of the mode-locked oscillator of the present embodiment will now be illustrated: the modulator modulates the pump light to generate noise in an optical signal loop, so that the mode-locked oscillator starts oscillation, when a pulse signal with the central wavelength of 1060 nanometers is transmitted in the first ytterbium-doped optical fiber, the energy of the pulse signal can be amplified under the excitation of the first 980 nanometer pump source, the amplified pulse signal is transmitted to the first micro-nano optical fiber, and the pulse signal has a strong nonlinear effect (mainly playing a role in self-phase modulation effect) because the diameter of a fiber core of the first micro-nano optical fiber is small and the nonlinear coefficient is high, and under the action of self-phase modulation, the frequency spectrum of the pulse signal is widened, the pulse signal with the broadened frequency spectrum is filtered by the first filter, the pulse energy is reduced, and the central wavelength is changed into 1065 nanometers. The filtered pulse signal enters a second ytterbium-doped optical fiber to be amplified, the frequency spectrum is further widened under the action of the high nonlinear effect of the second micro-nano optical fiber, the width of the frequency spectrum is wide enough at the moment, the filtering range of a second filter is covered, the central wavelength of the pulse is changed into 1055 nanometers after the pulse is filtered by the second filter, and a coupler is arranged in front of the second filter, so that the pulse can be output before being filtered, and the high-energy high-peak power pulse which runs stably is obtained.
In the embodiments of the mode-locked oscillator, the degree of integration of the mode-locked oscillator is improved by adopting an all-fiber structure, and the stability of the mode-locked oscillator is improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A mode locked oscillator, comprising:
at least two amplifiers connected end to form an optical signal loop; the amplifier is used for amplifying the pulse signal transmitted in the optical signal loop; wherein any of the amplifiers comprises a modulator; the modulator is used for modulating the pump light of the corresponding amplifier and inputting the modulated pump light to the optical signal loop; the modulated pump light introduces noise in the optical signal loop, and the pulse signal is formed after the noise is transmitted for a plurality of circles after oscillation;
at least two filters coupled into the optical signal loop; the filter is used for filtering the pulse signal transmitted in the optical signal loop; wherein adjacent said filters are separated by one said amplifier; the central wavelengths of the filters are different;
an isolator connected to the optical signal loop; the isolator is used for limiting the transmission direction of the pulse signal transmitted in the optical signal loop;
a coupler connected to the optical signal loop; the coupler is used for coupling and outputting the pulse signal transmitted in the optical signal loop;
the optical fiber module also comprises at least two micro-nano optical fibers;
each micro-nano optical fiber is respectively connected to the optical signal loop, wherein one amplifier and one filter are arranged between every two adjacent micro-nano optical fibers at intervals;
the mode-locked oscillator is of an all-fiber structure;
the central wavelength of each filter is set according to a preset rule; the preset rule is that the amplifier containing the modulator is taken as a starting point, and 10 nanometers are sequentially reduced along the direction of one circle of pulse signal circulation; the bandwidths of the filters do not overlap.
2. The mode locked oscillator according to claim 1, wherein said filter is a 5 nanometer bandwidth filter.
3. The mode locked oscillator according to claim 1, wherein the number of amplifiers is the same as the number of filters.
4. The mode locked oscillator according to claim 1, wherein said amplifier comprises a pump source, a wavelength division multiplexer, and a doped fiber;
the pumping source is connected with the wavelength division multiplexer; the wavelength division multiplexer and the doped optical fiber are sequentially and alternately connected to form the optical signal loop;
the modulator is connected between the corresponding pump source and the wavelength division multiplexer.
5. The mode locked oscillator according to claim 4, wherein the doped fiber is an ytterbium doped fiber, a thulium doped fiber, or an erbium doped fiber.
6. The mode locked oscillator of claim 5, wherein said pump source is a 980 nm pump source for said ytterbium-doped fiber and said erbium-doped fiber or a 1550 nm pump source for said thulium-doped fiber.
7. The mode locked oscillator according to any one of claims 1 to 6, further comprising a polarization controller;
and the polarization controller is connected into the optical signal loop.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005094275A2 (en) * | 2004-03-25 | 2005-10-13 | Imra America, Inc. | Optical parametric amplification, optical parametric generation, and optical pumping in optical fibers systems |
| JP2006324613A (en) * | 2005-05-17 | 2006-11-30 | Alnair Labs:Kk | Passive mode-locking short pulsed light fiber laser and scanning pulsed laser |
| CN106716749A (en) * | 2014-12-15 | 2017-05-24 | Ipg光子公司 | Passively mode-locked fiber ring generator |
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| EP1729379A4 (en) * | 2004-03-05 | 2009-07-29 | Furukawa Electric Co Ltd | Optical fiber laser using rare earth-added fiber and wide band light source |
| US9323128B1 (en) * | 2015-05-07 | 2016-04-26 | Inphi Corporation | Off quadrature biasing of mach zehnder modulator for improved OSNR performance |
| CN105552706B (en) * | 2015-12-17 | 2019-03-19 | 北京无线电计量测试研究所 | A kind of generating means of short-term frequency stability standard |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005094275A2 (en) * | 2004-03-25 | 2005-10-13 | Imra America, Inc. | Optical parametric amplification, optical parametric generation, and optical pumping in optical fibers systems |
| JP2006324613A (en) * | 2005-05-17 | 2006-11-30 | Alnair Labs:Kk | Passive mode-locking short pulsed light fiber laser and scanning pulsed laser |
| CN106716749A (en) * | 2014-12-15 | 2017-05-24 | Ipg光子公司 | Passively mode-locked fiber ring generator |
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