KR20170052332A - Pulse generating apparatus having interferometer for selectively generating mode-locked pulse and noise like pulse - Google Patents
Pulse generating apparatus having interferometer for selectively generating mode-locked pulse and noise like pulse Download PDFInfo
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4257—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
- G01J9/02—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength by interferometric methods
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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
- H01S3/06725—Fibre characterized by a specific dispersion, e.g. for pulse shaping in soliton lasers or for dispersion compensating [DCF]
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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
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08054—Passive cavity elements acting on the polarization, e.g. a polarizer for branching or walk-off compensation
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Abstract
An apparatus for generating a selective mode pulse of a mode lock pulse and a noise pulse includes a laser diode for outputting light and a polarization controller for generating a mode lock pulse or a noise pulse by adjusting the polarization of the pulse, And a control unit that is optically connected to the output terminal and is electrically connected to the polarization control unit to sense and disperse the light output from the resonator and to divide and interfere with the light output from the resonator to detect whether an interference signal is generated, And a signal detection controller for transmitting a control signal to stop the operation of the polarization controller when it is confirmed that the pulse or the noise pulse is generated.
Description
The present invention relates to a pulse generating apparatus, and more particularly, to a selective pulse generating apparatus capable of generating a dual mode pulse in a single resonator.
Most of the fiber-based laser resonators are composed of optical fibers, so that they are simple in configuration, easy to operate with a turn-key system and insensitive to changes in the environment, and can be operated for a long time. In addition, using fiber optic components in the communication band, it has various advantages that are industrially applicable such as low price and utilization in communication band.
A mode-locked pulse generates a spectrum having a wavelength width of several to several tens of nanometers (see FIG. 13A), which is formed at a repetition rate frequency interval corresponding to the resonator length, and has a frequency range of several tens to several millions of frequency modes (See FIG. 13B). The phases of the respective frequency modes generate pulses of picosecond (ps) to femtosecond (fs) width on the time axis and form a repeated pulse train at a cycle corresponding to the repetition rate (see FIGS. 13C and 13D). The generated mode lock pulse has a high peak output and high time and space coherence, making it suitable for non-thermal processing and precise distance measurement.
Noise like pulses form a spectrum having a wavelength width of several tens to several hundreds of nanometers or more (see FIG. 14A), and the phases of the respective frequency modes do not coincide with each other so that a narrow width pulse is not generated ), And a noise pulse repeated in a period corresponding to the repetition rate on the time axis is formed (see FIGS. 14C and 14D). The generated noise pulse is a light source suitable for accurate shape measurement because it has low time coherence and high spatial coherence.
In some cases, mode locking pulses or noise pulses have been observed in the form of a specific resonator. However, when generating a mode locking pulse and a noise pulse in one resonator, it is necessary to select one of the generated pulses.
SUMMARY OF THE INVENTION The present invention has been accomplished on the basis of the technical background described above, and it is an object of the present invention to provide a mode lock having an interferometer capable of selectively generating a desired pulse by sensing a mode lock pulse and a noise pulse generated in a single resonator, And an apparatus for generating a selective pulse of a pulse and a noise pulse.
An apparatus for generating a selective pulse of a mode lock pulse and a noise pulse according to an exemplary embodiment of the present invention includes a laser diode for outputting light and a polarization controller for generating a mode lock pulse or a noise pulse by controlling polarization of the pulse, And a mode locking unit that is optically connected to an output terminal of the resonator and is electrically connected to the polarization control unit to detect generation of the mode lock pulse or the noise pulse output from the resonator, And a signal detection controller for confirming the generation of the pulse or the noise pulse and transmitting the control signal to stop the operation of the polarization controller.
The signal sensing controller includes a light sensing unit for sensing a pulse output from the resonator, a control signal generating unit coupled to the light sensing unit and generating a signal for controlling the polarization controlling unit according to the pulse sensed by the light sensing unit, An application program unit connected to the control signal generator and connected to the polarization controller to transmit the control signal generated by the control signal generator to the polarization controller, And an interferometer unit electrically connected to the program unit and detecting whether an interference signal is generated depending on the type of light output from the resonator.
The optical sensing unit may include a dispersion optical system for spatially dispersing the light output from the resonator by frequency, and a first region in which the center of the dispersed light is incident from the dispersion optical system, A second region, and a third region that is set at an outer periphery of the second region, wherein a light sensor is positioned for each of the regions, and light scattered from the dispersion optical system is detected for each of the regions .
The optical sensor outputs an electrical signal corresponding to a mode lock pulse when the light is sensed over the first area and the second area and outputs a noise pulse when the light is sensed over the first area to the third area. Can be output.
The dispersion optical system may include a grating or a prism.
The optical sensor may include a plurality of optical sensors, and the plurality of optical sensors may be linear or planar.
The optical sensor may include a first photodiode located in the second region outside the first region and a second photodiode located in the third region outside the second region.
The optical sensing unit includes a light splitter for dividing the light output from the resonator into at least two divided light beams, a first optical system for inputting the first divided light beams output from the optical splitter and blocking the continuous wave and the Q- A second optical filter for receiving a second split light output from the optical splitter and blocking a mode lock pulse spectrum region, a first photodiode for detecting light transmitted through or reflected from the first optical filter, And a second photodiode that transmits the second optical filter or senses the reflected light.
The optical sensing unit may include a first optical filter that receives light output from the resonator and blocks a continuous wave and a Q-switching spectral region, a second optical filter that transmits light transmitted through or reflected from the first optical filter, A first photodiode for sensing a second split beam output from the beam splitter, a second optical beam splitter for receiving a second split beam output from the beam splitter, A filter, and a second photodiode that transmits the second optical filter or detects the reflected light.
The optical sensing unit may include an optical coupler that splits the light output from the resonator into at least two divided lights, a first optical system that receives the first split light output from the optical coupler, A second optical filter that receives a second split light output from the optical coupler and blocks a mode locking pulse spectrum region, a first photodiode that detects light transmitted through or reflected from the first optical filter, And a second photodiode that transmits the second optical filter or senses the reflected light.
The optical sensing unit may include a first optical filter that receives light output from the resonator and blocks a continuous wave and a Q-switching spectral region, a second optical filter that transmits light transmitted through or reflected from the first optical filter, A first photodiode for detecting a second split beam outputted from the optical coupler, a second optical beam splitter for receiving a second split beam outputted from the optical coupler, A filter, and a second photodiode that transmits the second optical filter or detects the reflected light.
Wherein the interferometer section comprises: a light splitter that divides the light output from the resonator into a first split light and a second split light; a second splitting optical system that is spaced apart from the optical splitter by a length of a first optical path corresponding to a pulse repetition rate length, A second mirror that is spaced apart from the optical splitter by a length of a second optical path corresponding to a multiple of two or more times the pulse repetition rate length and reflects the second divided light, And a photodiode for detecting whether or not an interference signal is generated by receiving the first divided light and the second divided light reflected from the second mirror.
Wherein the interferometer section comprises: an optical coupler for dividing the light output from the resonator to form a first optical path and a second optical path; an optical path difference retarder formed on the second optical path for generating a path delay; A second optical coupler coupled to the second optical coupler for coupling the first split light passing through the first optical path and the second split light passing through the second optical path, And a photodiode for detecting whether an interference signal is generated.
Wherein the interferometer section comprises: an optical coupler for dividing the light output from the resonator to form a first optical path and a second optical path; an optical path difference delayer connected to the first optical path for generating a path delay; A mirror connected to the optical path and reflecting the incident light, and a second splitting light which is connected to the optical coupler and passes through the first optical path and a second split light passing through the second optical path, And a photodiode that senses light.
The resonator may include any one of a ring cavity optical fiber resonator, a figure 8 cavity optical fiber resonator, and a figure 9 cavity optical fiber resonator.
The resonator may be a ring-shaped optical fiber resonator, and the ring-shaped optical fiber resonator may form a loop by connecting the gain medium connected to the laser diode and the pulse shaping section to each other.
The 8-shaped optical fiber resonator includes a gain medium connected to the laser diode, a first gain control unit connected to the first gain control unit and the second gain control unit, The polarization control section forms a first loop, the second polarization controller and the pulse shaping section form a second loop, and the first loop and the second loop may be connected through an optical coupler.
Wherein the resonator is a nine-figure-shaped optical fiber resonator, the polarization controller includes a first polarization controller and a second polarization controller, and the nine-figure optical fiber resonator comprises a gain medium connected to the laser diode, The polarization control section forms a loop, and the second polarization control section, the pulse shaping section, and the mirror are sequentially connected to the loop through an optical coupler.
According to the apparatus for generating selective pulses of the mode lock pulse and the noise pulse according to the embodiment of the present invention, a desired pulse is selectively generated by sensing a mode lock pulse and a noise pulse generated by a single resonator and controlling the resonator .
FIG. 1 is a schematic diagram showing an apparatus for generating a selective pulse of a mode lock pulse and a noise pulse according to an embodiment of the present invention. Referring to FIG.
FIGS. 2A and 2B are schematic diagrams illustrating a polarization controller included in a resonator in an apparatus for generating selective pulses of a mode lock pulse and a noise pulse according to an embodiment of the present invention. FIG. 2A shows a polarization control unit based on a bulk optical system, and FIG. 2B shows a polarization control unit based on a fiber optic optical system.
3A to 3C are graphs showing spectral energy densities according to wavelengths of light. FIG. 3A shows the spectral energy density of each wavelength of the continuous wave, FIG. 3B shows the spectral energy density of Q-switching by wavelength, FIG. 3C shows the spectral energy density of the mode lock pulse and the noise pulse, .
4A and 4B are schematic diagrams for explaining a configuration and a sensing method of the optical sensing unit in the apparatus for generating a selective pulse of a mode locking pulse and a noise pulse according to an embodiment of the present invention. FIG. 4B is a schematic diagram showing the division of pulses according to the area of the optical sensor to which the dispersion optical system emission light is incident. FIG.
5A and 5B are schematic diagrams for explaining the configuration and sensing method of the optical sensing unit in the apparatus for generating a selective pulse for a mode locking pulse and a noise pulse according to another embodiment of the present invention. FIG. 5B is a table showing distinctions of pulses according to detection conditions of a photodiode to which the dispersion optical system emission light is incident. FIG.
6A and 6B are schematic diagrams illustrating an optical sensing unit in an apparatus for generating a selective pulse for a mode lock pulse and a noise pulse according to another embodiment of the present invention. FIG. 6A shows a light sensing unit based on a bulk optical system, and FIG. 6B shows a light sensing unit based on an optical fiber.
FIGS. 7A to 7C are schematic diagrams showing a configuration of an interferometer unit in a mode pulse generating apparatus and a noise pulse generating apparatus according to an embodiment of the present invention. FIG. 7A shows a bulk optical system based interferometer unit, 7c shows an optical fiber based interferometer unit, and FIG. 7d is a table showing distinction of pulses according to detection conditions of a photodiode and an interferometer unit of the light sensing unit.
8A and 8B are schematic diagrams for explaining the configuration and sensing method of the optical sensing unit in the apparatus for generating a selective pulse of a mode locking pulse and a noise pulse according to another embodiment of the present invention. 8B is a table showing distinctions of pulses according to detection conditions of the photodiodes to which the dispersion optical system emission light is incident.
9A to 9E are schematic diagrams illustrating an optical sensing unit in an apparatus for generating a selective pulse for a mode lock pulse and a noise pulse according to another embodiment of the present invention. FIGS. 9A and 9B show a light sensing unit based on a bulk optical system, FIGS. 9C and 9D show an optical fiber based optical sensing unit, and FIG. 9E is a table showing whether or not a photodiode signal is detected according to a pulse state.
Figs. 10A and 10B are graphs showing a blocking region of an optical filter applied to the optical sensing unit shown in Figs. 9A to 9E, wherein Fig. 10A shows a blocking region of the first optical filter, Fig. And shows a blocking region of the filter.
11 is a schematic diagram showing a state in which an 8-shaped resonator is applied to an apparatus for generating a selective pulse of a mode locking pulse and a noise pulse according to another embodiment of the present invention.
12 is a schematic diagram showing a state in which a nine-character resonator is applied to an apparatus for generating a selective pulse of a mode locking pulse and a noise pulse according to another embodiment of the present invention.
13A to 13D are graphs showing the characteristics of the mode lock pulse.
14A to 14D are graphs showing the characteristics of the noise pulse.
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification. In addition, since the sizes and thicknesses of the respective components shown in the drawings are arbitrarily shown for convenience of explanation, the present invention is not necessarily limited to those shown in the drawings.
The term "on " in the present invention means to be located above or below the object member, and does not necessarily mean that the object is located on the upper side with respect to the gravitational direction. Also, throughout the specification, when an element is referred to as "including" an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise.
Hereinafter, an apparatus for generating selective pulses of a mode lock pulse and a noise pulse according to embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic diagram illustrating an apparatus for generating a selective pulse of a mode lock pulse and a noise pulse according to an exemplary embodiment of the present invention. FIG. 7 is a schematic diagram showing a polarization controller included in a resonator in a generating apparatus. FIG.
1, the
In this embodiment, the
The
The
The
The
2A shows a bulk optical system based
The
The
The pump light can be output using the
The
When the frequency modes that are multiples of the repetition rate frequency corresponding to the resonator length among the frequencies corresponding to the wide emission spectrum band of the
Nonlinear polarization evolution, nonlinear amplifying (optic) loop mirror, and saturable absorber are the methods of forming such a mode lock, and the mode applied according to the resonator structure The locking method is different.
Frequency modes that are multiples of the repetition rate frequency corresponding to the resonator length among the frequencies corresponding to the wide emission spectrum band of the
In the
Referring to FIG. 1, the driving process of the
First, when the
Next, the
Next, the
Accordingly, when the
3A to 3C are graphs showing spectral energy densities of the respective wavelengths according to the types of light. FIG. 3A shows the spectral energy density of each wavelength of the continuous wave, FIG. 3B shows the spectral energy density of Q-switching by wavelength, FIG. 3C shows the spectral energy density of the mode lock pulse and the noise pulse, .
The spectrum before the mode lock pulse is generated is either a continuous wave or a Q-switched state and has a wavelength bandwidth within a few nanometers of the gain medium.
Referring to FIG. 3C, a mode locking pulse forms a spectrum having a wavelength bandwidth of several to several tens of nanometers centered on a center wavelength, and a noise pulse has a spectrum having a wavelength bandwidth of several tens to several hundreds of nanometers or more .
4A and 4B are schematic diagrams for explaining a configuration and a sensing method of the optical sensing unit in the apparatus for generating a selective pulse of a mode locking pulse and a noise pulse according to an embodiment of the present invention. FIG. 4B is a schematic diagram showing the division of pulses according to the area of the optical sensor to which the dispersion optical system emission light is incident. FIG.
4A, the
The
4B, the
The
The
In this embodiment, the
5A and 5B are schematic diagrams for explaining the configuration and sensing method of the optical sensing unit in the apparatus for generating a selective pulse for a mode locking pulse and a noise pulse according to another embodiment of the present invention. FIG. 5B is a table showing distinctions of pulses according to detection conditions of a photodiode to which the dispersion optical system emission light is incident. FIG.
Referring to FIG. 5A, the optical sensor of the light sensing unit 211 according to the present embodiment includes a
Referring to FIG. 5B, when the light is detected by the
6A and 6B are schematic diagrams illustrating an optical sensing unit in an apparatus for generating a selective pulse for a mode lock pulse and a noise pulse according to another embodiment of the present invention. FIG. 6A shows a light sensing unit based on a bulk optical system, and FIG. 6B shows a light sensing unit based on an optical fiber.
Referring to FIG. 6A, the
6A, the
Referring to FIG. 6B, the
As shown in FIG. 6B, the
On the other hand, the
FIGS. 7A to 7C are schematic diagrams showing a configuration of an interferometer unit in a mode pulse generating apparatus and a noise pulse generating apparatus according to an embodiment of the present invention. FIG. 7A shows a bulk optical system based interferometer unit, 7c shows an optical fiber based interferometer unit, and FIG. 7d is a table showing distinction of pulses according to detection conditions of a photodiode and an interferometer unit of the light sensing unit.
7A, the bulk optical system based
The
7B, the optical fiber based interferometer unit 270 'includes a first
The light output from the
Referring to FIG. 7C, the optical fiber based interferometer unit 270 'of another example includes an optical coupler 270' for dividing the light output from the
The light output from the
When the light output from the
Therefore, in the pulse generating apparatus according to the present embodiment, the generation of the mode lock pulse or the noise pulse can be classified and controlled by combining the signal detected by the photodiode of the photo sensing unit and the interference signal detected by the interferometer.
7D, when the light is detected by the
Meanwhile, in the pulse generating apparatus according to the present embodiment, the light sensing unit may include a plurality of photodiodes along the region.
8A and 8B are schematic diagrams for explaining the configuration and sensing method of the optical sensing unit in the apparatus for generating a selective pulse of a mode locking pulse and a noise pulse according to another embodiment of the present invention. FIG. 8B is a table showing distinctions of pulses according to detection conditions of the photodiodes to which the dispersion optical system emission light is incident. FIG.
Referring to FIG. 8A, the optical sensor of the light sensing unit 210 'according to the present embodiment includes a plurality of
Referring to FIG. 8B, when the
9A to 9E are schematic diagrams illustrating an optical sensing unit in an apparatus for generating a selective pulse for a mode lock pulse and a noise pulse according to another embodiment of the present invention. FIGS. 9A and 9B show a light sensing unit based on a bulk optical system, FIGS. 9C and 9D show an optical fiber based optical sensing unit, and FIG. 9E is a table showing whether or not a photodiode signal is detected according to a pulse state.
9A and 9B, the
9A, the
9B, in the optical sensing unit 220 'according to the modification of the present embodiment, the first
9C and 9D, the
9C, the
9D, in the optical sensing unit 230 'according to the modification of the present embodiment, the first
On the other hand, the first
Referring to FIG. 9E, when the
11 is a schematic diagram showing a state in which an 8-shaped optical fiber resonator is applied to an apparatus for generating a selective pulse of a mode locking pulse and a noise pulse according to another embodiment of the present invention.
11, the 8-shaped
The
12 is a schematic diagram showing a state in which a nine-character optical fiber resonator is applied to an apparatus for generating a selective pulse of a mode locking pulse and a noise pulse according to another embodiment of the present invention.
12, a nine-figure
The
While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of course.
10, 30, 50: selective
200, 400, 600: signal detection control unit 120: laser diode
130: gain medium 135: isolator
140: polarization controller 150: pulse shaping unit
210: light sensing unit 240: control signal generating unit
250: Application program
Claims (19)
And a light source that is optically connected to an output terminal of the resonator and is electrically connected to the polarization controller to sense and disperse the light output from the resonator and to divide and interfere with light output from the resonator to detect whether an interference signal is generated, A signal detection controller for transmitting a control signal to stop the operation of the polarization controller when it is confirmed that the mode lock pulse or the noise pulse is generated,
And a mode lock pulse generator for generating a mode lock pulse and a noise pulse.
The signal-
A light sensing unit for sensing a pulse output from the resonator;
A control signal generator connected to the light sensing unit and generating a signal for controlling the polarization controller according to the pulse sensed by the light sensing unit;
An application program unit connected to the control signal generator and connected to the polarization controller to transmit the control signal generated by the control signal generator to the polarization controller; And
An interferometer unit that is optically connected to an output terminal of the resonator and is electrically connected to the application program unit and detects whether an interference signal is generated according to the type of light output from the resonator;
And a mode lock pulse generator for generating a mode lock pulse and a noise pulse.
The interferometer unit,
A light splitter for splitting the light output from the resonator into a first split light and a second split light;
A first mirror that is spaced apart from the optical splitter by a length of a first optical path corresponding to a pulse repetition rate length and reflects the first split light;
A second mirror spaced apart from the optical splitter by a length of a second optical path corresponding to a multiple of twice the pulse repetition rate length and reflecting the second split light; And
A second mirror for reflecting the first split light reflected from the first mirror and the second split light reflected from the second mirror to detect whether an interference signal is generated,
And a mode lock pulse generator for generating a mode lock pulse and a noise pulse.
The interferometer unit,
An optical coupler for dividing the light output from the resonator to form a first optical path and a second optical path;
An optical path difference retarder formed on the second optical path to generate a path delay;
A second optical coupler coupling the first optical path and the second optical path; And
A photodiode connected to the second optical coupler for receiving a first split beam passing through the first optical path and a second split beam passing through the second optical path to detect whether an interference signal is generated,
And a mode lock pulse generator for generating a mode lock pulse and a noise pulse.
The interferometer unit,
An optical coupler for dividing the light output from the resonator to form a first optical path and a second optical path;
An optical path difference delayer connected to the first optical path to generate a path delay;
A mirror coupled to the second optical path and reflecting the incident light; And
A photodiode connected to the optical coupler for detecting whether an interference signal is generated by receiving a first split beam passing through the first optical path and a second split beam passing through the second optical path,
And a mode lock pulse generator for generating a mode lock pulse and a noise pulse.
The photo-
A dispersion optical system for spatially dispersing light output from the resonator by frequency; And
A first region where a center of scattered light from the dispersion optical system is incident, and a second region that is formed in a predetermined area on an outer periphery of the first region, wherein a photo-sensing sensor is positioned for each of the regions, And a light sensor
And a mode lock pulse generator for generating a mode lock pulse and a noise pulse.
The optical sensor includes:
And outputs an electric signal corresponding to a mode lock pulse or a noise pulse when the light is detected over the first area and the second area.
The optical sensor includes:
And a first photodiode located in the second region outside of the first region.
The optical sensor includes:
Further comprising a second photodiode located outside of the second region. ≪ Desc / Clms Page number 13 >
The photo-
A first optical filter that receives light output from the resonator and blocks a continuous wave and a Q-switching spectral region; And
A first photodiode that transmits the first optical filter or senses reflected light,
And a mode lock pulse generator for generating a mode lock pulse and a noise pulse.
The photo-
A light splitter for splitting the light output from the resonator into at least two divided lights;
A first optical filter that receives the first split light output from the optical splitter and blocks the continuous wave and the Q-switched spectral range;
A second optical filter that receives the second split light output from the optical splitter and blocks the mode locking pulse spectrum region;
A first photodiode that transmits the first optical filter or detects the reflected light; And
A second photodiode that transmits the second optical filter or detects the reflected light,
And a mode lock pulse generator for generating a mode lock pulse and a noise pulse.
The photo-
A first optical filter that receives light output from the resonator and blocks a continuous wave and a Q-switching spectral region;
A light splitter for splitting the light transmitted through or reflected by the first optical filter into a first split light and a second split light;
A first photodiode sensing a second split light output from the optical splitter;
A second optical filter that receives the second split light output from the optical splitter and blocks the mode locking pulse spectrum region;
A second photodiode that transmits the second optical filter or detects the reflected light,
And a mode lock pulse generator for generating a mode lock pulse and a noise pulse.
The photo-
A first optical filter that receives light output from the resonator and blocks a continuous wave and a Q-switching spectral region; And
A first photodiode that transmits the first optical filter or senses reflected light,
And a mode lock pulse generator for generating a mode lock pulse and a noise pulse.
The photo-
An optical coupler for dividing the light output from the resonator into at least two divided lights;
A first optical filter that receives the first split light output from the optical coupler and blocks the continuous wave and the Q-switching spectral range;
A second optical filter that receives the second split light output from the optical coupler and blocks the mode locking pulse spectrum region;
A first photodiode that transmits the first optical filter or detects the reflected light; And
A second photodiode that transmits the second optical filter or detects the reflected light,
And a mode lock pulse generator for generating a mode lock pulse and a noise pulse.
The photo-
A first optical filter that receives light output from the resonator and blocks a continuous wave and a Q-switching spectral region;
An optical coupler for splitting the light that has passed through the first optical filter or reflected by the first split light and the second split light;
A first photodiode sensing a second split light output from the optical coupler;
A second optical filter that receives the second split light output from the optical coupler and blocks the mode locking pulse spectrum region;
A second photodiode that transmits the second optical filter or detects the reflected light,
And a mode lock pulse generator for generating a mode lock pulse and a noise pulse.
The resonator may include a mode lock pulse and a noise pulse, including a ring cavity optical fiber resonator, a figure 8 cavity optical fiber resonator, or a figure 9 cavity optical fiber resonator. / RTI >
Wherein the resonator is a ring-shaped optical fiber resonator,
Wherein the ring-shaped optical fiber resonator comprises a gain medium connected to the laser diode and a pulse shaping unit connected to the polarization control unit to form a loop, wherein the mode lock pulse and the noise pulse are generated in the form of a loop.
Wherein the resonator is an 8-shaped optical fiber resonator,
Wherein the polarization controller includes a first polarization controller and a second polarization controller,
Wherein the 8-shaped optical fiber resonator forms a gain medium connected to the laser diode and the first polarization control unit form a first loop, the second polarization control unit and the pulse shaping unit form a second loop,
Wherein the first loop and the second loop are coupled through an optical coupler.
Wherein the resonator is a nine-figure-shaped optical fiber resonator,
Wherein the polarization controller includes a first polarization controller and a second polarization controller,
The 9-shaped optical fiber resonator includes a gain medium connected to the laser diode and the first polarization control unit forming a loop, and the second polarization control unit, the pulse shaping unit, and the mirror are sequentially A mode lock pulse and a noise pulse.
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