KR101751609B1 - Direct optical intensity modulator based wavelength swept quantum cascade laser - Google Patents

Direct optical intensity modulator based wavelength swept quantum cascade laser Download PDF

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KR101751609B1
KR101751609B1 KR1020150153038A KR20150153038A KR101751609B1 KR 101751609 B1 KR101751609 B1 KR 101751609B1 KR 1020150153038 A KR1020150153038 A KR 1020150153038A KR 20150153038 A KR20150153038 A KR 20150153038A KR 101751609 B1 KR101751609 B1 KR 101751609B1
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quantum
light
resonator
wavelength
laser
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KR20170050911A (en
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한영근
김선덕
신종철
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한양대학교 산학협력단
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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
    • H01S5/00—Semiconductor lasers
    • H01S5/30—Structure or shape of the active region; Materials used for the active region
    • H01S5/34—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers
    • H01S5/3401—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers having no PN junction, e.g. unipolar lasers, intersubband lasers, quantum cascade lasers
    • H01S5/3402—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers having no PN junction, e.g. unipolar lasers, intersubband lasers, quantum cascade lasers intersubband lasers, e.g. transitions within the conduction or valence bands
    • 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
    • H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
    • H01S3/1062—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using a controlled passive interferometer, e.g. a Fabry-Perot etalon
    • 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
    • H01S5/00—Semiconductor lasers
    • H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
    • H01S5/0064—Anti-reflection components, e.g. optical isolators
    • 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
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/062—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
    • H01S5/06226—Modulation at ultra-high frequencies
    • H01S5/0623—Modulation at ultra-high frequencies using the beating between two closely spaced optical frequencies, i.e. heterodyne mixing
    • 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
    • H01S5/00—Semiconductor lasers
    • H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
    • H01S5/12—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region the resonator having a periodic structure, e.g. in distributed feedback [DFB] lasers
    • 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
    • H01S5/00—Semiconductor lasers
    • H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
    • H01S5/18—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities
    • H01S5/183—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]
    • H01S5/18355—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL] having a defined polarisation
    • 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
    • H01S5/00—Semiconductor lasers
    • H01S5/50—Amplifier structures not provided for in groups H01S5/02 - H01S5/30
    • H01S5/5063—Amplifier structures not provided for in groups H01S5/02 - H01S5/30 operating above threshold
    • H01S5/5072—Gain clamping, i.e. stabilisation by saturation using a further mode or frequency

Abstract

The wavelength variable direct quantum depth-based laser according to an embodiment of the present invention includes a quantum cascade (QC) gain medium mounted on a resonator to amplify light provided to the resonator; An isolator mounted on the resonator for moving the light amplified by the quantum waterfall gain medium in only echoes; And a polarization controller mounted on the resonator and adapted to match the polarization of the light resonated by the resonator, wherein the amplitude of the light is directly modulated in accordance with the resonance speed of the wavelength set in the quantum waterfall gain medium to oscillate the selected wavelength have. According to the embodiment of the present invention, the entire structure can be simplified by directly modulating the light width through the quantum waterfall gain medium, and the electrical method other than the mechanical operation method can be applied to realize excellent durability and speedup .

Description

[0001] The present invention relates to a wavelength tunable laser diode (LDF)

Lightwave width direct modulation based wavelength tunable quantum waterwave lasers are disclosed. More particularly, a wavelength variable direct quantum based wavelength tunable quantum depth laser is disclosed that can simplify the overall configuration by directly modulating the amplitude of the light through the quantum waterfall gain medium.

In general, a tunable laser is an optical device capable of providing optical signals of various wavelengths as a single light source, and is utilized not only in an optical communication system but also in a sensor field for gas detection. In addition, its use in biomedical fields including spectroscopic and optical coherence tomography has been expanded in recent years. The configuration of the wavelength tunable laser can be found in, for example, Korean Patent Application No. 10-2010-0001728 entitled "Tunable Variable Laser capable of Adjusting Line Width ".

Meanwhile, the conventional high-speed wavelength tunable laser can realize a laser light source whose wavelength is changed at high speed by implementing a Fourier Domain Mode Locked (FDML) type laser. In this case, a fiber Fabry-Perot Tunable Filter (FFP-TF) was used as a tunable filter.

However, in the conventional Fourier domain mode locked (FDML) type laser, since the device itself of the fiber Fabry-Perot transform filter is weak in durability and the wavelength is changed by a mechanical movement, there is a limit in speed. In addition, other signals other than sinusoidal wavelength tunable signals could not be used because they could damage the filter.

It is an object of an embodiment of the present invention to simplify the overall configuration by directly modulating the width of the light through the quantum waterfall gain medium and realize an excellent durability by applying an electrical method instead of a mechanical operation method, Wavelength direct modulation based wavelength tunable quantum depth lasers capable of realizing wavelength tunable quantum depth lasers.

It is another object of the present invention to provide a method and apparatus for quantitative waterfall gain medium for directly modulating a light source width, which can be applied to a field requiring high-speed variable-wavelength infrared light, The present invention provides a wavelength variable quantum waterfall laser based on a wide-wavelength direct modulation capable of being used in a field where various wavelength tunable signals are required because oscillation of a wavelength variable quantum water laser is possible.

The wavelength variable direct quantum depth-based laser according to an embodiment of the present invention includes a quantum cascade (QC) gain medium mounted on a resonator to amplify light provided to the resonator; An isolator mounted on the resonator for moving the light amplified by the quantum waterfall gain medium in only echoes; And a polarization controller mounted on the resonator and adapted to match the polarization of the light resonated by the resonator, wherein the amplitude of the light is directly modulated in accordance with the resonance speed of the wavelength set in the quantum waterfall gain medium to oscillate the selected wavelength By this configuration, it is possible to simplify the overall configuration by directly modulating the optical width through the quantum waterfall gain medium. By applying the electrical method instead of the mechanical operation method, the durability can be improved and the speed can be improved have.

According to one aspect, a frequency synthesizer is coupled to the quantum waterfall gain medium to receive a fundamental frequency from the quantum waterfall gain medium to bring the wavelength of the light to the predetermined wavelength in the quantum waterfall gain medium. And a function generator connected to the frequency synthesizer to synthesize a variable frequency to the fundamental frequency to directly modulate a frequency inputted to the optical amplitude direct modulation according to time to modulate the oscillated wavelength.

According to an aspect of the present invention, the optical dispersion medium may further include a light dispersion medium that is mounted on the resonator and differently induces a resonance speed of the light having a width modulated by the wavelength.

According to one aspect of the present invention, the optical signal inputted to the resonator and modulated by the optical pulse width may have a signal wave shape including a sine wave, a sawtooth wave or a square wave.

According to an aspect of the present invention, there is provided an optical circulator comprising: a light circulator mounted on the resonator; A saturable absorber connected to the optical circulator and passing the light passing through the optical circulator; And a mirror connected to the saturable absorber, wherein the light passing through the optical circulator passes through the saturable absorber and is reflected by the mirror to return to the saturable absorber, and light absorbed by the saturable absorber So that light in a single longitudinal mode can be oscillated by eliminating noise by overlapping each other.

According to one aspect of the present invention, the resonator includes a plurality of sub-resonators having different resonance frequencies, thereby converting the multi-longitudinal mode of the light into the single-longitudinal mode.

According to one aspect of the present invention, the micro-optical fiber knot resonator can oscillate light in a single longitudinal mode in the resonator.

According to one aspect, the quantum waterfall gain medium may be a Fabry-Perot laser, a distributed feedback laser or an external cavity laser and may oscillate a wavelength laser in the mid-infrared region .

According to one aspect, the optical dispersion medium may be a highly nonlinear optical fiber or a dispersion-dispersed optical fiber of a dispersion shifted fiber.

According to one aspect, the light dispersion medium may be a chirped fiber bragg grating connected to a light circulator mounted on the resonator.

According to one aspect of the present invention, the wavelength-tunable wavelength variable quantum-water-based laser can be used as a sensor for measuring gas including methane gas and ammonia gas in the middle infrared region.

Meanwhile, a wavelength variable direct quantum depth-based laser according to an embodiment of the present invention includes a plurality of QC (Quantum Cascade) gain mediums, each of which is mounted in series with a resonator and amplifies light provided to the resonator, ; A plurality of isolators mounted in the resonator to be positioned on either side of each of the plurality of quantum waterfall gain media and moving the light amplified by each of the plurality of quantum waterfall gain media in only one echo; And a plurality of polarization controllers mounted in the resonator such that they are positioned between the plurality of quantum-water gain media, the polarization controllers matching the polarization of the light resonating in the resonator, wherein the optical centers of the plurality of quantum- The variable width of the wavelength tunable laser by the plurality of quantum cascade gain media can be extended and the variable tunable bandwidth can be formed by a plurality of wavelengths with different wavelengths.

Meanwhile, a wavelength variable direct quantum depth-based laser according to an embodiment of the present invention includes a plurality of quantum cascade gain media (QC), which are mounted in parallel in a resonator and amplify light provided to the resonator, ; An optical splitter interposed between the resonator and the plurality of quantum-water gain media to divide the light into the plurality of quantum-water gain media; And an optical coupler interposed between the resonator and the plurality of quantum-water gain media to couple light from the plurality of quantum-water gain media, wherein optical center wavelengths of the plurality of quantum- Thereby varying the variable width of the wavelength variable laser by the plurality of quantum well gain media and forming a plurality of tunable bandwidths.

According to the embodiment of the present invention, the entire structure can be simplified by directly modulating the light width through the quantum waterfall gain medium, and the electrical method other than the mechanical operation method can be applied to realize excellent durability and speedup .

In addition, according to the embodiment of the present invention, since quantum waterfall gain medium is applied to directly modulate the light width, the present invention can be applied not only to a field requiring high-speed variable-wavelength infrared light but also to a wavelength variable variable- It can be applied in the field where various wavelength variable signals are needed because the oscillation of the waterfall laser is possible.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic diagram of a wavelength variable direct quantum based wavelength tunable quantum laser according to a first embodiment of the present invention; FIG.
FIG. 2 is a view for explaining the principle of a wavelength variable direct quantum based wavelength variable laser of FIG. 1; FIG.
FIG. 3 is a diagram showing a schematic configuration of a wavelength variable direct quantum based wavelength tunable quantum laser according to a second embodiment of the present invention.
FIG. 4 is a diagram showing a schematic configuration of a wavelength variable direct quantum based wavelength tunable quantum laser according to a third embodiment of the present invention.
FIG. 5 is a diagram showing a schematic configuration of a wavelength variable direct quantum based wavelength tunable quantum laser according to a fourth embodiment of the present invention.
6 is a diagram showing a schematic configuration of a wavelength variable direct quantum based wavelength tunable quantum laser according to a fifth embodiment of the present invention.
FIG. 7 is a diagram showing a schematic configuration of a wavelength variable direct quantum based wavelength tunable quantum laser according to a sixth embodiment of the present invention.
FIG. 8 is a diagram showing a schematic configuration of a wavelength variable direct quantum based wavelength tunable quantum laser according to a seventh embodiment of the present invention.
FIG. 9 is a diagram showing a schematic configuration of a wavelength variable direct quantization-based wavelength variable quantum depth laser according to an eighth embodiment of the present invention.

Hereinafter, configurations and applications according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE INVENTION The following description is one of many aspects of the claimed invention and the following description forms part of a detailed description of the present invention.

In the following description, well-known functions or constructions are not described in detail for the sake of clarity and conciseness.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic diagram of a wavelength variable direct quantum based wavelength tunable quantum laser according to a first embodiment of the present invention; FIG.

As shown in the figure, the wavelength variable direct quantum depth modulation laser 100 according to the first embodiment of the present invention includes a resonator 110, and a resonator 110, which is mounted on the resonator 110 and provided to the resonator 110 A quantum cascade (QC) gain medium 120 for amplifying the light and a plurality of quantum cascade gain media 120 mounted on the resonator 110 so as to be positioned on both sides of the quantum cascade gain medium 120 to amplify the light amplified by the quantum cascade gain medium 120 An optical isolator 130 for shifting the resonant frequency of the light modulated by the quantum-frequency gain medium 120 in one direction, two polarization controllers 140 for matching the polarization of the light resonated by the resonator 110, And a light dispersion medium 160 for guiding the light emitted from the light emitting diodes.

With this configuration, the amplitude of the light can be directly modulated in accordance with the resonance speed of the specific wavelength set in the quantum waterfall gain medium 120 to oscillate only a selected arbitrary wavelength.

First, the resonator 110 of the present embodiment, as shown in FIG. 1, has an overall closed-loop shape and is equipped with configurations including a quantum-water gain medium 120. The resonator 110 may be formed of an optical fiber.

The quantum waterfall gain medium 120 of the present embodiment can amplify light using the principle of the quantum waterfall. In other words, when an electric field is applied to the quantum-water gain medium 120, the electrons move from the energetically high potential to the energetically low potential through the quantum mechanical tunneling effect, whereby the optical amplification can be performed.

A Fabry-Perot laser, a distributed feedback laser, or an external cavity laser may be applied to the quantum-water gain medium 120, The laser can be oscillated. However, the kind of the quantum waterfall gain medium 120 is not limited thereto.

Referring to FIG. 1, a frequency synthesizer 150 for frequency synthesis and a function generator 155 for generating a function are connected to the quantum waterfall gain medium 120 of the present embodiment, .

1, the frequency synthesizer 150 of the present embodiment is connected to the quantum waterfall gain medium 120 to receive a fundamental frequency from the quantum waterfall gain medium 120, The wavelength of the light can be obtained at a set wavelength.

The function generator 155 of the present embodiment is connected to the frequency synthesizer 150 to synthesize a variable frequency to a fundamental frequency to directly modulate a frequency inputted to the optical amplitude modulation in accordance with time to selectively modulate the oscillated wavelength have.

In this way, the quantum waterfall gain medium 120 can modulate the wavelength oscillated according to the light-source-width direct modulation by the interaction with the frequency synthesizer 150 and the function generator 155. And the oscillated wavelength may be output through the optical isolator 170 shown in FIG.

In addition, various signals including a sinusoidal wave, a sawtooth wave, and a square wave can be inputted into the wavelength variable signal inputted to the optical amplitude modulation, so that the oscillation wavelength by the quantum waterfall gain medium 120 can be varied.

1, the isolator 130 of this embodiment is mounted on the resonator 110 so as to be positioned on both sides of the quantum waterfall gain medium 120 so that the light generated by the quantum waterfall gain medium 120 Direction, that is, in the arrow direction of FIG. This makes it possible to prevent the occurrence of interference due to the superposition of light.

The polarization controller 140 of the present embodiment is mounted on the resonator 110 on both sides of a pair of isolators 130 with a quantum waterfall gain medium 120 interposed therebetween, as shown in FIG. The polarization controller 140 positioned on the right side of FIG. 1 corresponds to the polarization of the light passing through the quantum waterfall gain medium 120 and the isolator 130, and the polarization controller 140 located on the left corresponds to the optical dispersion medium 160 ) Of the polarized light.

Meanwhile, the optical dispersion medium 160 of the present embodiment differently induces the resonance velocity of the light directly modulated by the optical amplitude by the quantum waterfall gain medium 120.

Hereinafter, the operation principle of the wavelength variable direct quantization-based wavelength variable quantum depth laser having the above-described configuration will be described.

FIG. 2 is a view for explaining the principle of a wavelength variable direct quantum based wavelength variable laser of FIG. 1; FIG.

The free spectral range (FSR) of the resonator 110 of this embodiment can be expressed by the following equation.

Figure 112015106250295-pat00001
... Equation 1

Where c is the speed of light, n is the refractive index of the optical fiber, and L is the length of the resonator 110. When the optical dispersion medium 160 is present inside the resonator 110, the expression of the pre-spectral range is expressed as follows.

Figure 112015106250295-pat00002
... Equation 2

Where D is the dispersion value, [Delta] [lambda] is the bandwidth of the light, and [Delta] F is the dispersed FSR. In other words, the FSR value varies depending on the wavelength. When the amplitude of the light is modulated at a specific frequency f m , the oscillation wavelength can be expressed by the following equation.

Figure 112015106250295-pat00003
... Equation 3

Where f m0 is the center modulation frequency and λ 0 is the center oscillation wavelength. In other words, by varying the modulation frequency, the oscillation wavelength can be controlled as in the above equation.

As described above, according to the embodiment of the present invention, the entire structure can be simplified by directly modulating the optical width through the quantum waterfall gain medium 120, and the electrical method other than the mechanical operation method is applied, thereby realizing excellent durability The speed improvement can be realized.

In addition, since the quantum waterfall gain medium 120 is applied to directly modulate the light source width, the present invention can be applied not only to a field requiring high-speed tunable infrared light, but also to an oscillation of a single- or multi- And it can be applied in fields requiring various wavelength variable signals.

Also, the wavelength variable direct quantum based wavelength tunable quantum depth laser of the above-described configuration can be applied to a sensor for measuring gas including methane gas and ammonia gas in the mid-infrared region.

In addition, various signals such as a sawtooth wave or a square wave as well as a sinusoidal wave can be applied as a wavelength variable signal.

Hereinafter, the wavelength variable direct quantum based wavelength tunable quantum depth laser according to each of the other embodiments of the present invention will be described, but the description of configurations substantially the same as those of the above embodiment will be omitted.

FIG. 3 is a diagram showing a schematic configuration of a wavelength variable direct quantum based wavelength tunable quantum laser according to a second embodiment of the present invention.

As shown therein, the wavelength tunable quantum depth laser 200 according to the second embodiment of the present invention is substantially similar to the wavelength tunable quantum depth laser 100 (see Fig. 1) of the first embodiment described above, A saturable absorber 283 connected to the optical circulator 280 and passing light passing through the optical circulator 280 and a mirror connected to the saturable absorber 283 285).

With this configuration, light passing through the optical circulator 280 passes through the saturable absorber 283, is reflected by the mirror 285 and returns to the saturable absorber 283, and the light absorbed by the saturable absorber 283 Are superimposed on each other to remove noise, so that light in a single longitudinal mode can be oscillated.

Meanwhile, FIG. 4 is a diagram showing a schematic configuration of a wavelength variable direct quantum based wavelength tunable quantum laser according to a third embodiment of the present invention.

As shown therein, the wavelength variable quantum falls laser 300 according to the third embodiment of the present invention is substantially similar to the wavelength variable quantum laser 100 (see Fig. 1) of the first embodiment described above, And a plurality of sub-resonators (313, 315) mounted on the optical fiber (310) for converting the multi-longitudinal mode of light into a single-longitudinal mode. The plurality of sub resonators 313 and 315 can oscillate light in a single longitudinal mode by eliminating the multi-longitudinal mode.

Meanwhile, FIG. 5 is a diagram showing a schematic configuration of a wavelength variable direct quantum based wavelength tunable quantum laser according to a fourth embodiment of the present invention.

As shown therein, the wavelength tunable quantum depth laser 400 according to the fourth embodiment of the present invention is substantially similar to the wavelength tunable quantum depth laser 100 (see Fig. 1) of the first embodiment described above, And a micro-optical fiber knot resonator 413 mounted on the optical fiber 410 to oscillate light in a single longitudinal mode.

Meanwhile, FIG. 6 is a schematic diagram of a wavelength variable direct quantum based wavelength tunable quantum depth laser according to a fifth embodiment of the present invention.

As shown therein, the wavelength tunable quantum depth laser 500 according to the fifth embodiment of the present invention is substantially similar to the wavelength tunable quantum depth laser 100 (see Fig. 1) of the first embodiment described above, There is a difference in the dispersion medium 560.

The optical dispersion medium 560 of this embodiment may be a light dispersion optical fiber such as a highly nonlinear optical fiber or a dispersion shifted fiber. However, the optical fiber applicable to the optical dispersion medium 560 is not limited thereto.

Meanwhile, FIG. 7 is a schematic diagram of a wavelength variable direct quantum based wavelength tunable quantum depth laser according to a sixth embodiment of the present invention.

As shown therein, the wavelength variable quantum falls laser 600 according to the sixth embodiment of the present invention is substantially similar to the wavelength variable quantum laser 100 (see Fig. 1) of the first embodiment described above, There is a difference in the dispersion medium 660.

The optical dispersion medium 660 of the present embodiment may be a chirped fiber Bragg grating 665 connected to the optical circulator 661 mounted on the resonator 610. Therefore, the light is incident on the chip optical fiber grating 665 through the optical circulator 661, and the returning light is incident on the resonator 610 again, whereby the resonance speed of each wavelength of light can be derived differently.

Meanwhile, FIG. 8 is a diagram showing a schematic configuration of a wavelength variable direct quantum based wavelength tunable quantum depth laser according to a seventh embodiment of the present invention.

As shown in the drawing, a wavelength tunable laser 700 according to the seventh embodiment of the present invention includes a resonator 710, and a resonator 710. The resonator 710 includes a resonator 710, A plurality of quantum cascade gain media 720 mounted on the resonator 710 to be positioned on either side of each of the plurality of quantum cascade gain media 720 and a plurality of quantum cascade gain media 720, A plurality of quantum gauge gain media 120 and a plurality of quantum gain gain media 120. The plurality of quantum gain gain media 120 are disposed between the plurality of quantum gain gain media 120 and the plurality of quantum gain gain media 120, And may include a plurality of polarization controllers 740 that match the polarization of light.

That is, similar to the wavelength tunable quantum lasers of the above-described embodiment, the quantum cascade gain media 720 are arranged in series with the resonator 710, and each quantum cascade gain medium 720 is provided with an isolator 730, 740, a frequency synthesizer 750, and a function generator 755 are connected to each other.

With this configuration, it is possible to extend the variable width of the wavelength variable laser by the plurality of quantum-water gain media 720 by varying the optical center wavelength of the plurality of quantum-water gain media 720 and form a plurality of variable wavelength bandwidths have.

Meanwhile, FIG. 9 is a diagram showing a schematic configuration of a wavelength variable direct quantum based wavelength variable quantum depth laser according to an eighth embodiment of the present invention.

As shown therein, the tunable quantum depth laser 800 according to the eighth embodiment of the present invention includes a plurality of quantum cascades (not shown) that are mounted in parallel to the resonator 810 and each amplify the light provided to the resonator 810 A quantum cascade gain medium 820 and a light separator 820 interposed between the resonator 810 and the plurality of quantum cascade gain media 820 to divide the light into a plurality of quantum cascade gain media 820 890 and an optical coupler 895 interposed between the resonator 810 and the plurality of quantum-water gain media 820 to couple the light from the plurality of quantum-water gain media 820 to each other.

An isolator 830 and the like are mounted on the resonator 810 on both sides of the plurality of quantum waterfall gain media 820 connected in parallel and a frequency synthesizer 850 and a function generator 820 are connected to each quantum waterfall gain medium 820. [ 855, and the like are mounted.

With this configuration, it is possible to extend the variable width of the wavelength tunable laser by the plurality of quantum gain gain media 820 by varying the optical center wavelength of the plurality of quantum waterfall gain media 820, and to form a plurality of variable wavelength bandwidths have.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

100: wavelength tunable quantum laser
110: Resonator
120: quantum waterfall gain medium
130: Isolator
140: polarization controller
150: Frequency synthesizer
155: Function generator
160: light dispersion medium
180: optical isolator

Claims (13)

A quantum cascade (QC) gain medium mounted on the resonator to amplify light provided to the resonator;
An isolator mounted on the resonator for moving the light amplified by the quantum waterfall gain medium in only echoes; And
A polarization controller mounted on the resonator for matching the polarization of the light resonated by the resonator;
/ RTI >
Wherein the amplitude of the light is directly modulated to the resonance speed of the wavelength set in the quantum waterfall gain medium to oscillate the selected wavelength,
Wherein the resonator is provided with a plurality of sub resonators having different resonance frequencies to convert the multi-longitudinal mode of the light into a single longitudinal mode.
The method according to claim 1,
A frequency synthesizer coupled to the quantum waterfall gain medium to receive a fundamental frequency from the quantum waterfall gain medium to bring the wavelength of the light to the predetermined wavelength in the quantum waterfall gain medium; And
A function generator connected to the frequency synthesizer for modulating a wavelength to be oscillated by directly modulating a frequency inputted to the optical pulse width direct modulation by synthesizing a variable frequency to the fundamental frequency;
Further comprising a photodetector coupled to the photodetector.
3. The method of claim 2,
Further comprising a light dispersion medium mounted on the resonator for differently inducing a resonance velocity of the light modulated by the wavelength, the light dispersion medium being different in wavelength.
The method according to claim 1,
Wherein the optical signal input to the resonator has a signal waveform including a sinusoidal wave, a sawtooth wave, or a square wave as a light-width-modulated optical signal.
The method according to claim 1,
A light circulator mounted on the resonator;
A saturable absorber connected to the optical circulator and passing the light passing through the optical circulator; And
And a mirror connected to the saturable absorber,
The light having passed through the optical circulator passes through the saturable absorber, is reflected by the mirror and returns to the saturable absorber, and the light absorbed by the saturable absorber is superimposed on each other to remove noise, This oscillation is based on a direct modulation wavelength based variable wavelength quantum laser.
delete The method according to claim 1,
In the resonator, a micro-optical fiber knot resonator oscillates light in a single longitudinal mode.
The method according to claim 1,
The quantum waterfall gain medium may be a Fabry-Perot laser, a distributed feedback laser or an external cavity laser, and may be a laser-based direct modulation based oscillator that oscillates a wavelength laser in the mid- Variable wavelength quantum laser.
The method of claim 3,
Wherein the optical dispersion medium is a light dispersion optical fiber of a highly nonlinear optical fiber or a dispersion shifted fiber, wherein the optical dispersion medium is a highly nonlinear optical fiber or a dispersion shifted fiber.
The method of claim 3,
Wherein the optical dispersion medium is a chirped fiber bragg grating connected to a light circulator mounted on the resonator.
The method according to claim 1,
The wavelength-variable direct-modulation-based tunable quantum-water-based laser can be used as a sensor for measuring gases including methane gas and ammonia gas in the medium-infrared region.
A plurality of quantum cascade (QC) gain media mounted in series with the resonator, each amplifying the light provided to the resonator;
A plurality of isolators mounted in the resonator to be positioned on either side of each of the plurality of quantum waterfall gain media and moving the light amplified by each of the plurality of quantum waterfall gain media in only one echo; And
A plurality of polarization controllers mounted in the resonator such that they are positioned between the plurality of quantum-water gain media and coinciding the polarization of the light resonating in the resonator;
/ RTI >
A plurality of quantum-water-frequency gain media having different optical center wavelengths to expand the variable width of the variable-wavelength laser by the plurality of quantum-
Wherein the resonator is provided with a plurality of sub resonators having different resonance frequencies to convert the multi-longitudinal mode of the light into a single longitudinal mode.
A plurality of quantum cascade (QC) gain media mounted in parallel on the resonator, each amplifying the light provided to the resonator;
An optical splitter interposed between the resonator and the plurality of quantum-water gain media to divide the light into the plurality of quantum-water gain media; And
A photocoupler interposed between the resonator and the plurality of quantum well gain media to couple light from the plurality of quantum well gain media;
/ RTI >
A plurality of quantum-water-frequency gain media having different optical center wavelengths to expand the variable width of the variable-wavelength laser by the plurality of quantum-
Wherein the resonator is provided with a plurality of sub resonators having different resonance frequencies to convert the multi-longitudinal mode of the light into a single longitudinal mode.
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